“Free radicals” are a special type of atom that have been linked to many age-related diseases. They form as a result of a process called Oxidative Stress, which takes place when an oxygen molecule splits into single atoms with unpaired electrons. The nature of electrons is such that they like to be in pairs and as a result will “freely” and “radically” search throughout the body for another electron to pair with. They could almost be considered romantic if they were not so dangerous!

Their main danger comes from the damage that they cause to cells or cell membrane, proteins, and DNA. Cellular damage occurs when free radicals travel through cells and disrupt the structures of other molecules. The gradual accumulation of them, and the increased damage that builds as more and more of them collect, is what helps cause many of the aforementioned aging diseases. Our body is under constant assault from oxidative stress, and cells may function poorly or die if it occurs too frequently and without proper bodily maintenance.

Free radicals are a waste byproduct that form as a result of various chemical reactions that take place during our bodies’ normal metabolic processes. They are then “dumped,” and their eventual buildup will often harm our bodies much like how factory waste harms the environment However, they are not entirely useless; it is impossible for our bodies to turn air and food into chemical energy without a chain reaction of free radicals. Free radicals are also a critical part of the immune system, as they additionally move through our veins and can confront foreign invaders [1].

What are free radicals?

Understanding free radicals necessitates an elementary knowledge of chemistry.

Electrons orbit around atoms in levels called shells. Each shell is filled by a fixed number of electrons, and when the first shell is full then electrons will start to fill the next shell.

If there is an atom whose outer shell is not full then it may bond with another atom by using the electrons to fill its outer shell. These types of atoms are known as free radicals.

Atoms that have a full outer shell become stable, however free radicals are unstable. They are “desperate” to acquire the full number of electrons that are necessary to fill all of their shells and will therefore react quickly with other substances.

Take the example of oxygen molecules. If they split into single atoms that have unpaired electrons then they too will become unstable free radicals that seek other atoms or molecules to bond to. If this procedure continually occurs, then it will begin a process called oxidative stress.

Smoking, UV rays, air pollution, fast food, pesticides, ionizing radiation, drugs, and inflammation have all been linked to the formation of free radicals. We must be diligent when it comes to understanding how these influences can affect our bodily health, and then fight back with natural antioxidants.

Free radicals are heavily linked to aging

One of the effects of oxidative stress is that it can damage our body’s cells and thus promote many of the diseases and symptoms related to aging, such as wrinkles and gray hair. They will take electrons from other atoms in order to become more stable, a process that may cause diseases or signs of aging [2].              

In 1956, the “Free Radical Theory of Aging” was outlined as a way to understand how exactly our bodies age over time. Everybody ages, and as we age our body loses its ability to fight the effects of free radicals. Over time our bodies produce more free radicals and more oxidative stress, which increases the rate at which cells are damaged and thus can bring about degenerative processes.

Many age-related diseases such as muscular degeneration, certain cancers, atherosclerosis, cardiovascular disease, emphysema, Alzheimer’s disease, Parkinson’s disease, ulcers and all inflammatory diseases such as arthritis and lupus, and many others are linked to free radicals. Free radicals can be found in the food we eat such as fried foods, the medicines we take, the air we breathe, and the water we drink. Free radicals are also found in alcohol, tobacco smoke, pesticides, and air pollutants.

Several studies and theories have been linked to oxidative stress and the buildup of free radicals including: [3]

• Genetic degenerative diseases, such as Huntington’s disease or Parkinson’s
• Age-related changes in appearance, such as loss of skin elasticity, wrinkles, graying hair, hair loss, and changes in hair texture
• Cataracts and age-related vision decline
• Diabetes
• Cancer, which is associated with chromosomal effects and oncogene activation due to the reaction of free radicals [2]
• Central nervous system diseases, such as Alzheimer’s and various forms of dementia
• Cardiovascular diseases due to clogged arteries
• Autoimmune and inflammatory disorders, such as rheumatoid arthritis and cancer

The free radical theory of aging is comparatively new; however, several studies boost its credibility. Researchers focused on cell’s mitochondria, the “powerhouse” that process nutrients to power the entire cell. Experiments on rats, for example, showed a noteworthy increase in free radicals as the rats aged. These alterations coincided with age-related declines in their health. These experiments also showed that free radicals produced in the mitochondria harm the substances that the cells need in order to work properly. This damage causes mutations that produce more free radicals, thus accelerating the process of damage to the cell. This helps explain aging since aging quickens over time. The gradual, but increasingly rapid buildup of free radicals, offers one explanation for why even healthy bodies age and depreciate over time [2].

Antioxidants can stave off free radicals

Antioxidants, molecules that prevent other molecules from oxidizing and thus undergoing oxidative stress, can help to avert the harmful effects of free radicals. They can also decrease or even nullify the effects of free radicals, as they can provide an electron to free radicals and thereby reduce their reactivity. The uniqueness of antioxidants is that they can donate an electron without becoming reactive free radicals themselves.

There is no single antioxidant that can combat the effects of every free radical. Free radicals have different effects in different areas of the body, and every antioxidant performs differently due to its chemical properties. Antioxidants such as vitamins C and E, beta-carotene, glutathione, and plant estrogens called phytoestrogens all scavenge the body and help remove free radicals. Honey can also function similar to antioxidants by removing free radicals. Additionally, selenium, a trace metal that is required for proper function of one of the body’s antioxidant enzyme systems, is sometimes included in this category. The body cannot manufacture these micronutrients so they must be supplied in the diet.

Foods that are rich in antioxidants include citrus fruits such as oranges and limes, berries, and many other fruits that are rich in vitamin C. Carrots are known for their high beta-carotene content, while the soy in soybeans, and some meat substitutes, are high in phytoestrogens. Apricots, spinach, mangoes, pumpkins, broccoli, and eggplants are all also helpful, along with a plethora of other fruits and vegetables [4].

More research needed

A 2010 study on antioxidant supplementation for the prevention of prostate cancer found no benefits. Furthermore, a 2012 study found that antioxidants did not lower the risk of lung cancer. On the other hand, the study found that people who were already at a heightened risk of cancer, such as smokers, actually had a slightly elevated risk of cancer due to antioxidants.

Some investigators have found that supplementation with antioxidants is injurious when people take more than the recommended daily allowance (RDA). A recent analysis found that high doses of beta-carotene, or vitamin E, appreciably increased the risk of dying. One study found that long-term use of beta-carotene could reasonably reduce the risk of age-related mental problems [4]. But perhaps one of the most important discoveries is that antioxidants are unable to “cure” the effects of free radicals completely [5].  

Additionally, we do not yet fully understand why free radicals form in the first place. They may result as an early sign of cells fighting diseases, or that free radical formation is simply a natural expectation that comes with aging. It is not possible to understand them completely without more conclusive research, which should be encouraged considering the significant impacts that free radicals can have upon our bodies.

References

1. https://www.rice.edu/~jenky/sports/antiox.html
2. https://www.medicalnewstoday.com/articles/318652#How-do-free-radicals-damage-the-body
3. http://www.mytruehealth.info/mytruehealth_antioxidants_freeradicals.html
4. https://www.medicalnewstoday.com/articles/318652#Antioxidants-and-free-radicals
5. https://www.medicalnewstoday.com/articles/318652#What-we-do-not-know

All human beings have similar organs, but each organ has qualities unique to itself and to the person it belongs to. Research has revealed that even some of the genes of monozygotic twins are different [1]. As opposed to the previous assumption that “when it comes to DNA, every cell in the body is essentially identical to every other cell,” it has been found that each cell has a DNA of its own [2]. This uniqueness originates from the fact that the order and number of molecules and proteins are different, which is valid for atoms and sub-atom particles as well. Having spent countless hours on microscopes and spectroscopes, a university professor of mine once said, “I witnessed different structures of iron atom each time I observed one. We even need to produce a separate periodic table for the iron element alone.”

We also witness that particles have been created uniquely, just like human beings are. From the micro universe (one millionth of a meter) down to femto universe (one quadrillionth of a meter), each particle is called a boson or fermion. When particles are examined to find out in what conditions they resemble each other in the femto universe, doors of a new world will be opened in terms of knowledge and contemplation. According to this new perspective, while the things and events are sometimes explained through mathematical equations and formulations, they are sometimes explained through experiments of thought trying to attain the truth behind them. Pauli exclusion principle is one such experiment.

Pauli Principle

There are around 380 sub-atomic particles [3]. In atomic and subatomic dimensions, two fermions (e.g. two electrons) of an atom cannot have the same set of quantum numbers. Wolfgang Pauli first explained this principle in 1925 and was awarded the Nobel Prize in Physics in 1945 after experiments proved that the theory was correct. This theory has gone down in history as the Pauli Exclusion Principle.

The motion equations of subatomic particles are expressed by their magnetic states. Pauli said that none of the electrons of an atom can share the same quantum state at the same time. In other words, two electrons in the same atom cannot share the physical features such as magnetism, motion, position and velocity in the same state [2].

In addition to the three quantum numbers (principal, subordinate, and magnetic quantum numbers) described so far, Pauli defined a quantum number for the spin of a fermion (e.g. electron). The spin quantum number is related to the rotation of the electron around its axis because an electron rotates around its own axis as it rotates around the atomic nucleus. According to the Pauli Principle, if an orbit has an electron with a spin of 1/2, an electron with a spin of -1/2 can be placed in the same orbit. If we assume that the spin of an electron rotating clockwise is 1/2 the spin of an electron rotating counterclockwise will be -1/2. Thus, with Pauli’s contribution, four quantum numbers were defined for subatomic particles and it was stated that even if the other three quantum numbers were the same, electrons with different spin quantum numbers could circulate in the same orbit.

The Pauli Principle shows that atoms are not identical. This principle also applies to solid crystals, that is, the materials we use daily. The Principle is also able to explain the fact that the ores that make up the element are different, and the fact that there are different elements in the periodic table. With this principle, important properties of superconductors have been discovered.

In 1927, based on the Pauli Principle, German physicist Karl Werner Heisenberg showed that it is not possible to measure the physical properties of a particle, such as the position and momentum, at the same time and that these results can only be expressed with uncertain probability and statistics [5].

This uniqueness also manifests itself in the space we call the macro world. Stars consisting of only neutrons are called neutron stars. A neutron star is very dense: its mass is 2–3 times that of the Sun, but only about 10 km in diameter. A neutron star should theoretically collapse into a black hole, but this does not happen. The reason for this, it has been discovered, is that neutrons that cannot share the same position prevent collapse and that neutron stars remain in balance [6].

The universe has been created with balance, and everything, from the minutest particles to the stars in the outer space, follows their particular courses to maintain the order.

References

1. scientificamerican.com/article/identical-twins-exhibit-d/
2. https://www.sciencedaily.com/releases/2009/07/090715131449.htm
3. lbl.gov/2017/listings/contents_listings.html
4. wikipedia.org/wiki/Wolfgang_Pauli
5. phy-astr.gsu.edu/hbase/uncer.html
6. phy-astr.gsu.edu/hbase/pauli.html

The existence of antimatter was suggested in 1928 by Paul Dirac and was confirmed experimentally in 1932 by Carl D. Anderson. They state that every elementary particle (matter) has its own anti-particle (antimatter): electrons have anti-electrons (positrons) and protons have anti-protons and so on. Antimatters have the same mass as matter, but they carry an opposite electrical charge [1]. For that reason, if matter and antimatter collide they cancel each other out, resulting in annihilation. This collision produces a tremendous amount of energy. For instance, a collision of 1 kg of matter and antimatter releases the energy equivalent to the explosion of 43 megatons of TNT [2].

However, producing antimatter is not an easy process and requires very energetic collisions in giant accelerators such as CERN, located near Switzerland, and Fermilab, located near Chicago, US. The annual amount produced in these laboratories is 1^-10 nanograms. The typical process is to accelerate protons to almost the speed of light, and then send them into a metal target, which is usually tungsten. Because of the collision, the protons are slowed or stopped by the nuclei of the tungsten atoms. The protons’ kinetic energy is converted into matter that contains subatomic particles, and some of these particles are antiprotons [3].

To avoid annihilation, antimatter must be separated from other subatomic particles. One way to do that is to use the Penning trap in which charged particles of antimatter are confined radially by homogenous magnetic fields and axially by quadropole electric fields. Penn State and NASA scientists have already built such a device capable of holding 10 million antiprotons for a week. Now they are developing a Penning trap with a capacity 100 times greater [3].

Figure 1: Schematic of Penning Trap: Electric fields are blue, Magnetic fields are red, a: end cap, b: ring electrode, c; magnets (www.en.wikipedia.org)

Many of us remember the antimatter engine from the Star Trek series. Interplanetary travel has been humankind’s dream for centuries. Now, scientists are designing a spacecraft propulsion system that will work by expelling the products from the annihilation of protons and antiprotons. Such a propulsion system requires antimatter the size of an aspirin (10 grams) for hundreds of light years of travel. However, this amount of antimatter is not available yet, and with current technologies, it would cost around 100 trillion dollars to produce 1 milligram of antimatter.

One of the discoveries made by scientist at Penn State was that a space propulsion system would need only a small fraction of the antimatter consumed by a beamed core engine. It would work with an antiproton induced micro-fission (ACMF). In this process, Deuterium-Tritium (D-T) pellet and Uranium-238 (U-238) are compressed with a proton beam [1 in Figure 2]. After two nanoseconds, the pellet is subject to antiproton beams [2 in Figure 2]. Uranium U-238 absorbs the antiprotons and the result is a hyper neutronic fission that transfers the heat energy from the uranium core to D-T pellet and ignites it [3 in Figure 2]. Propellant inside the pellet is expanded to produce a pulsed thrust [4 in Figure 2].

Figure 2: Illustration of ACMF reaction chain, in four steps (www.ffden-2.phys.uaf.edu)

Another concept is called Antimatter-initiated micro-fusion (AIM), which was also designed by Penn State scientists. In this mechanism, electromagnetic fields continuously compress a small concentration of antiproton plasma [1 in Figure 3] Than the Deuterium-Tritium droplet injected into the plasma [2 in Figure 3]. Also a small amount of U-238 is allowed to annihilate with the antiprotons, which fully ionizes and heats the plasma. The resulting product is expelled out of a magnetic nozzle to produce thrust [3 in Figure 3]. Finally potential well is relaxed to its original state [4 in Figure 3]

Figure 3: Illustration of AIM reaction chain, in four steps (www.ffden-2.phys.uaf.edu)

Scientists also believe that antimatter has the potential to be applied in medical sciences and one of them is fighting cancer. Currently, scientists at CERN are investigating the antiproton beam therapy as an alternative treatment. Experiments have compared the damage of proton and antiproton beams on hamster cells. The results show that the damage inflicted by antiprotons to cells at the end of the beam path was four times greater than that of proton beams. This means that one antiproton is enough to achieve the same damage as four protons, and moreover, antiprotons have unsurpassed ability to preserve healthy tissue [4].

Image of antimatter cell interaction experiment (www.rsc.com)

It seems that producing large quantities of antimatter is difficult and expensive today, but as long as we are on the right track with the right developments, one day, it could become a reality. If a significant amount of antimatter can be produced and controlled, this could help us obtain more information about nature, and it might become one of the world’s primary energy sources. It can also bring innovative solutions with medical benefits such as cancer therapy. Last but not least, antimatter also offers implications of existence beyond what we can see, thus an infinitely vast area of research to conduct via not only with our minds but also with our hearts.

Mehmet Fatih Yýlmaz is Assistant Professor at the engineering faculty of Mevlana University, Konya, Turkey.

Note: Author would like to thank Margaret Johnson for her useful comments on this article.

References

1. Dirac, Paul. 1928. “The Quantum Theory of the Electron,” from Proceedings of the Royal Society of London: Series A 117 (778): 610–624.

2. www.wikipedia.com

3. www.engr.psu.edu/antimatter

4. www.press.web.cern.ch

A small-scale blueprint of the universe, the human body is a miraculous work of art that manifests the beautiful divine names and attributes of God Almighty. A human body is made up of a set of hierarchically organized components: an organ system, organs, tissues, cells, organelles, macromolecules, molecules, atoms, neutrons, protons, electrons, and subatomic particles. In this biological organization, it is striking to observe a proportionately allocated space between components on each level for their efficient functioning. The size of human body would be reduced if these spaces between organs, tissues, cells, and atoms could be removed, and the entire human body would not be bigger than a small ball.

The structure of an atom explains a lot concerning the real size of our body, which is filled with space. An atom is comprised of protons and neutrons in its nucleus, around which electrons continuously orbit. The mass of neutrons is almost equal to the mass of protons. Electrons, however, are 1,837 times smaller in mass than neutrons and protons. That is, almost 99.95% of the atom’s mass is in its nucleus. The mass of electrons is almost non-existent compared to the nucleus.

Both the universe and our body are filled with more hydrogen than any other atom. In each one billion atom in our body, six hundred thirty million are hydrogen atoms. In a hydrogen atom, electrons rotate only 0.53 nm (one billionth of a meter) away from the nucleus, which makes the atom’s volume to be around 6.10^-28m³, whereas the volume of the proton is 7.10^-45m³, i.e., the nucleus is only as big as one hundred quadrillionth (100.10¹⁵) of the atom’s total volume. In other words, while the nucleus comprises almost the entire mass of the atom, its volume is of no considerable size. The density of protons in the nucleus is 2,3.10¹⁷ kg/m^{3 (where does the period go here??)}, which means that there is around a hundred trillion tons of matter in only one cubic meter. If we could gather all neutrons and protons in one spot, a man who is 69 kg would be only 3.10^-7 mm³ in volume. That is, the volume the total substance of our body takes up is around one ten millionth of a cubic millimeter. The human body, which is constructed of atoms with electrons rotating on an orbit quite far away from the nucleus, is in a way no different than an “inflated space.” For a comparison, the space between the earth and the sun can be filled with as many as 107 suns, whereas 450 thousand protons are needed to fill up the distance between the proton and electron in a hydrogen atom.

The subatomic world is even more amazing. In subatomic particles are found six types of quarks. A quark is considered a fundamental constituent of matter. Combinations of quarks in different shapes and numbers result in subatomic particles, the further combinations of which produce atoms, molecules, and so on. Quarks are considered to be without mass; that is to say, they are nothing else but energy. Humans have mass, but this mass consists of quarks that are without mass.

This incredibly vast space between atoms that make up matter teaches us that our true value does not lie in our physical structure, but in the artworks of no comparison designed by the Divine as manifestations of His most beautiful names. Thus, we, who are so little in material substance, should seek other gateways in the depth of our souls and attain some value with proximity to the Divine.

We may never have revolted against God Almighty in our entire life; yet still our material minority should free us from all kinds of pride and conceit. Our physical structure is very much like the number “zero,” for 0 is also nothing, and it is drawn by inflating.

Cherries are grown as one of three types: sweet, sour, or wild cherries. Alongside fresh cherry consumption, cherries are also used in juices, jams, jellies, cherry pies, cakes, ice cream, and so on. Cherries are healthful and rich in minerals. A hundred grams of cherry juice contains 246 kilocalories, 58.3 grams of carbohydrate, 3.12 grams of protein, 1 gram fat, 115 milligrams of sodium, 745 milligrams of potassium, 0.5 milligrams of vitamin C, 64 milligrams of calcium, and 81 milligrams of phosphorus. They are rich not only in folic acids, which play a significant role in producing nucleic acids and in the conversion reactions of certain amino acids, but also in potassium, which is needed for osmosis of bodily fluids and acid-base balance. Ripe cherry fruits have been widely used as a traditional medicine to relieve pain, especially in Western Europe and North America.

Cherries as a rich source of antioxidants

Antioxidants are vitamins, minerals and other compounds found in foods that can slow down the oxidation process. During the oxidation process that our body goes through in order to metabolize fats and glucose so they can turn into heat and energy, the body constantly produces free radicals as a byproduct of normal metabolism. Antioxidants help prevent the damage done to the body’s cells by such naturally occurring free radicals as super oxides. The super oxide exposure of a person weighing 70 kilograms amounts to about 1.72 kilograms on an annual basis.

Free radicals are unstable substances with missing electrons. They seek to balance themselves by stealing electrons. In constant need of electrons, free radicals take electrons from our healthy cells. Damage to healthy cells caused by free radicals plays a major role in the aging process as well as in the onset of many ailments. Antioxidants provide the electrons that these free radicals need so they can leave the electrons from your healthy cells alone. Protecting the body against free radicals’ mass conversion of cells, antioxidants help reduce the risk of various degenerative diseases caused by free radicals, boost the immune system and improve our health.

God Almighty has created all the cells of the body containing complex systems of antioxidants to prevent chemical damage to the cells’ components by oxidation. Our body is created with an ability to produce metabolic enzymes which are extremely effective antioxidant scavengers. However, the body produces more free radicals and fewer antioxidant enzymes after the late twenties. The All-Providing God has granted us many antioxidant-rich food products that may help us maintain a high quality of life, especially as this ability of the body to generate these enzymes fades dramatically with age.

Ranking above most fruits, cherries are an excellent antioxidant food. There are fourteen compounds in cherries with antioxidant properties. These compounds can protect the body against degenerative diseases, including cancers and cardiovascular disease. One of the more powerful antioxidant compounds in cherries is anthocyanin. In just one liter of cherry juice, there are 267–688 milligrams of anthocyanins that also give the fruit its bright red, red, purple, or violet color.

Recently, as awareness has been raised of most fruit and vegetables having natural antioxidants, and that cherries especially are a rich source of naturally occurring antioxidants, the use of such food products has become more common than synthetic antioxidant supplements.

More health benefits

Cherries offer other major health benefits. They contain the powerful antioxidant compound melatonin, which has anti-inflammatory properties and which controls daily circadian rhythms, helping to improve sleep patterns. Alongside their anti-inflammatory health benefits and improving sleep, they also provide pain relief. Research shows that the consumption of an average of twenty fresh cherries or some cherry juice is much more effective than aspirin in reducing pain caused by inflammation, arthritis or gout.

Cultivation, consumption, and storage

Cherry trees grow in a wide range of climatic conditions and are indeed easy to grow from seed. Once the cherry plant has established, it reaches the fruiting stage in several years.

Cherries can be consumed or stored in a great many ways. Alongside cherries eaten fresh or dried or the juice from the fruits, they can also be used in many dishes, especially desserts, jams, and marmalades. While buying cherries, select fresh, unblemished fruit. Besides consuming cherries as a fresh fruit item, they can also be kept in frozen fruit packs or in cans. Cherries that are to be saved can be stored in the freezer in airtight bags. Canned cherries are also available preserved in sugar syrup. Sweet cherries are particularly used in cakes and puddings. Sour cherries are generally candied or preserved.

While you are comfortably sitting in your chair or leaning against a pillow reading this article, you are rotating around the Earth’s axis at a speed up to 1000 miles per hour depending on how far you are from the poles. In addition, our planet is revolving around the Sun, in an orbit 186 million miles wide, at a speed of 67,000 mph. The Sun is taking its planets on a ride around the center of the Milky Way. In turn, the Milky Way, where the Solar System appears as no more than a small dust particle, is retreating from some galaxies and approaching others. For example, the Andromeda Galaxy is getting closer to us at a speed of 200,000 mph. And, even if you know all this, the apparent uniformity and order under which these movements occur enables you to feel at peace and to ignore them.

In distant space, new galaxies are being formed and many others are swallowed by mysterious black holes. Old stars collapse and explode to become supernova, or shrink and become little white dwarfs.

On our home planet which looks like a calm, blue marble from the space, atmospheric conditions from above and the volcanic forces from below cause continuous change in the layout of the continents and the oceans. Again, several centuries of scientific discoveries have shown that the continents are in constant motion, colliding on some fronts, and pulling apart in some other places. The theory of plate tectonics tells us that the continental plates float over the Earth and that when they collide, great mountain ranges (for example, the Himalayas) occur. For similar reasons, the Atlantic Ocean widens by four-tenths of an inch every year.

On the surface of the Earth, volcanoes rise and empty their contents as the building material for new lands. The wind and the rivers erode the soil, leveling the heights or causing deep canyons, slowly but steadily changing the layout of the land.

Animals and plants that sustain life on Earth come into existence and then disappear in lives that range from a few hours to several centuries. The plants recycle the soil and the gases and feed the animals, which return back to the soil when they die.

Your body is renewing itself without you being aware of it. Wounds heal, nails and hair grow. You breathe unconsciously and provide oxygen to blood cells that carry energy and nutrients to each and every cell in your body. The cells multiply for growth and renewal. The body fights against unknown intruders by producing its own medicines. The connections between your brain cells are constantly reestablishing themselves to enable you to understand and react to what you read or experience. Numerous decisions are made in the genes in the billions of cells in your body every moment to produce one or another kind of protein, which ultimately determines how your body functions.

The atoms, the building materials of all living or non-living matter in the universe, interact with other nearby atoms or even with atoms that are millions of light years away, reacting to their gravitational or electromagnetic forces. Atoms are bound to their neighbors, forming strong compounds or breaking bounds and releasing energy.

Even inside a single atom that is seemingly stable, a constant movement and renewal continues. The electrons circle the atomic nucleus at one percent of the speed of light. Even though matter in an atom constitutes a negligible part of the observed volume of the atom, the movements and resulting forces form the illusion of solid matter. When you are looking at a solid rock, are you aware that you are looking at an object that is 99.999999999 % empty? While the electrons continue their restless turn around the nucleus, they jump up and down the energy levels. The electrons seem to disappear from one level and reappear at another level without any continuum in between-hence the term “quantum leap.” When changing levels, electrons emit or absorb photons that are the building blocks of light.

The space-time continuum, first explained by Einstein, tells us that we will not be in the same place or at the same time twice. You will have traveled thousands of miles in the universe by the time you have finished reading this sentence.

In summary, everything in the universe, from the little subatomic particles to gigantic clusters of galaxies, is in a constant state of change.

In all this seemingly chaotic rush, there is a hidden order that keeps everything on course. When astronomers inspect the deep skies, they gasp when observing the beauty of celestial objects, like the nebulae structures recently discovered with the Hubble Space Telescope. On Earth, life continues to function on its course. Your body works until it has fulfilled its expected life span. And, despite all the electrons that are flying, disappearing, and reappearing, the book you left on the desk this evening will be there tomorrow morning-unless you have children at home.

It should be clear that any mishap, even for the slightest moment, might render the universe useless. So, why isn’t everything turning into a chaos of colliding, rotting, disappearing particles? What is the force that sets the harmony in the universe? This is best explained by Said Nursi, who wrote a century ago:

“The Glorious Creator of the universe is Self-Subsistent, that is, He subsists, continues, and endures of Himself. All things subsist and continue through Him, they remain in existence and have permanence. If that relationship of Self-Subsistence was cut off from the universe for even the fraction of a second, the universe would be annihilated.”

References

• See “The Great Attractor” at http://archive.ncsa.uiuc.edu/Cyberia/Cosmos/GtAttractor.html.
• Charles Flowers , Instability Rules: The Ten Most Amazing Ideas of Modern Science, John Wiley & Sons, 1st edition, March 15, 2002.
• See “Complete Coverage of the Hubble Space Telescope” at http://www.space.com/hubble.
• Nursi, Bediuzzaman Said, The Flashes, Sozler Publishing, 5th edition, December 1996.

The air that we breathe consists of 78% nitrogen, 21% oxygen and 1% other gases, such as water, carbon dioxide, and carbon monoxide. First of all, the level of oxygen in the air is of extreme importance; that is, if the air were to contain 40% oxygen instead of the normal 21%, then there would be no life on Earth. Most living organisms, if not all, would die due to oxygen poisoning. Their proteins and DNA would be oxidized and become non-functional. Metals would be corroded and trees would burn at slightly higher temperatures than normal.

Vertebrates have been equipped with two principal mechanisms to supply their cells with an adequate and continuous flow of oxygen. The first one is the circulatory system and the second one is oxygen-carrying molecules; hemoglobin in the red blood cells and myoglobin in the muscles. The air we breathe is filtered even before it reaches our lungs. Then, it dissolves in the mucus, a highly viscous material, which coats the inside of our lungs. Next, the dissolved oxygen diffuses into the blood through alveolar cells and the walls of the capillary vessels. Finally, the oxygen is picked up by the red blood cells; these are what make our blood red. The red color is due to a molecule called heme that is present in hemoglobin and myoglobin. Every heme molecule in hemoglobin can bind four oxygen molecules together. Every oxygen molecule bound to hemoglobin increases the affinity of hemoglobin to bind to another oxygen molecule. The hemoglobin becomes saturated if the dissolved oxygen is above a certain level; this can be seen in the lungs. If the level of dissolved oxygen drops below a certain level, as can be seen in tissues like the muscles, brain, and liver, then the oxygen molecules start to dissociate from the hemoglobin. Likewise, every dissociating oxygen molecule facilitates the dissociation of another oxygen molecule from the hemoglobin. This is one miraculous design that is known to us: a molecule devoid of any wisdom and intelligence grasps a very crucial cargo where it is abundant, carries it to a place where the cargo is most needed and less abundant, and releases it. The myoglobin in the muscle tissue then binds the oxygen and serves as an oxygen backup resource for times when there is inadequate oxygen supply during exertion.

Fetuses have their own specific hemoglobin, called hemoglobin-F, which is different from that of adult hemoglobin, hemoglobin-A. Before birth, the fetus gets its oxygen from the mother’s blood through the placenta. The higher affinity of hemoglobin-F than hemoglobin-A to oxygen makes the oxygen exchange between the maternal and fetal blood possible. It is interesting to note that right around the time of birth the fetus switches the production of hemoglobin-F to hemoglobin-A, as this is more efficient under normal breathing conditions. Our current knowledge is insufficient to completely understand how this switch-over occurs and how it is regulated. Future studies will shed light on this complex but magnificent mechanism of regulation and this superb design.

Why are we so dependent on oxygen? In fact, our energy metabolism is completely dependent on oxygen. The chemical breakdown of nutrients by a dozen enzymes releases energy, which as is cannot be stored or transferred to the places where it is required. We are equipped with a second mechanism, which involves another set of different proteins that converts the released chemical energy to a more useful and transferable molecular form, called ATP. ATP, which we can think of as small packages of energy, is the main form of energy within our cells that can be readily used by all reactions that require energy. The first set of enzymes abstracts electrons from the nutrients during their chemical breakdown. These so called high-energy electrons are transferred from one protein to the next by the second set of proteins that form the electron transport chain. The final acceptor of these electrons is molecular oxygen. If oxygen were not there to pick up the electrons at the end of this chain, the last protein (cytochrome oxidase) would lead to a dead end, as it would be rendered inactive with the electrons that it is carrying. This would make this superb design of complex mechanism useless and wasteful; the synthesis of every new and active cytochrome oxidase would require more energy than is produced in one cycle of an electron transfer in the absence of oxygen.

It has been known for some time that cells can sense the level of oxygen in their environment. They are equipped not only with a sensing mechanism, but also with a response mechanism, by which they can survive for a short period of time. In 1995, a protein called HIF (Hypoxia Inducible Factor) was identified and was shown to regulate cellular response to hypoxia, i.e., a reduced oxygen level. HIF is a transcription factor, which induces the expression of a set of genes that are required for survival under hypoxia. Several genes encoding glycolytic enzymes are regulated under hypoxia; this allows cells to produce ATP even without oxygen. Nevertheless, oxygen-independent energy generation is very inefficient and the yield is insufficient. Another set of genes induce angiogenesis (vascularization), or the making of new capillary vessels. VEGF (vascular endothelial growth factor) is one of the best known HIF target genes that induces the formation of new vessels where expressed.

One of the most remarkable aspects of HIF-based oxygen sensing is that under normal oxygen levels the HIF protein is simultaneously synthesized and degraded. Only under low levels of oxygen does HIF accumulate and induce its target genes. At first sight, this continuous production and degradation of HIF may look wasteful, whereas in reality it is a very well designed precautionary mechanism. The HIF protein is marked and sent for degradation by a class of enzymes called HPH/PHD. These enzymes also use the oxygen molecule to tag the HIF protein. If there were not enough oxygen around, HPH/PHD enzymes would not be able to tag HIF. As a result HIF accumulates and induces its target genes to ensure the adequate supply of oxygen. With this mechanism cells can quickly adapt and survive. Therefore, continuous production and degradation of HIF turns out to be a necessary precautionary measure which is taken against the risk of death arising from a low oxygen level.

This article is by no means a complete picture of the miraculous world of oxygen, perhaps it is no more than a brush stroke on the entire picture. Yet, even this incomplete glimpse is enough to help us realize how perfectly we have been created, and how well we are taken care of. We do not have even the slightest control over any of these aforementioned mechanisms. We breathe day and night, and every breath should be taken in gratitude to God, who created us as this masterpiece.

Yusuf Ali, in his translation of the Qur’an, asks several questions about lightning: Why look to evil rather than to good? To punishment rather than to mercy?”To the fear in the force and fire of the lightning rather than to hope of good and abundant crops in the rain which will come behind the lightning clouds (note 1818); Nay, thunder itself which may frighten you, is but a tame and beneficent force before Him, declaring His praises, like the rest of creation. Thunder thus aptly give the name to this surah of contrasts, where what we may think is terrible is shown to be really a submissive instrument of good in God’s hands (note 1819); and: To cowards, lightning and thunder appear as terrible forces of nature. Lightning seems to kill and destroy where its irresistible progress is not assisted by proper lightning”conductors. But lightning is also a herald of rain-bearing clouds and showers that bring fertility and prosperity in their train (3530).

Journals publish articles on injuries and death caused by lightning. However, the Qur’an specifically mentions the hope of lightning as a good or beneficent force. This article addresses this issue.

What are ions?

After a storm, the air feels clean and fresh filled with negative ions. People often report feelings of pleasantness and well-being following an electrical storm. Electrical storms are generally preceded by higher levels of positive ions and followed by higher levels of negative ions.

Air is made of individual molecules. When the outer electrons of two or more atoms join together, the resulting particle is a molecule. Each molecule, in turn, contains smaller particles of positive and negative charges (protons and electrons). Under normal circumstances, the number of protons and electrons are equal, and so their charges cancel out and leave the molecule electrically neutral. However, negatively charged electrons are lighter and more mobile. If they happen to absorb energy from intense sunlight, they tend to jump from one molecule to another. When a negative charge jumps from a molecule, it upsets the equilibrium and leaves behind more positive than negative charges. Thus the molecule becomes a positive ion. The electron arriving at the new molecule brings with it an extra negative charge. This molecule now becomes a negative ion. When the energy supply is removed, the electrons return toward the vacated spaces, and everything becomes balanced and has a zero charge.

Oxygen, a prime example of small gaseous molecules, remains neutral as long as the proton“electron balance is maintained. Since atoms have equal numbers of protons and electrons, they have no charge. However, if an electron is lost or gained, the molecule becomes positively or negatively charged, respectively, and an ion is created.

The simplest way to visualize an air ion is to consider it a tiny charge of static electricity carried by the air. This charge can be either positive or negative. The charged particles, or ions, are not merely suspended in the atmosphere; rather, they are part of the air’s very fabric. The air we breathe contains billions of tiny, invisible, electrically charged energy packets called ions, each of which have either positive or negative charges. Every time we take a breath, ions fill up our lungs and are carried by our blood into every cell in our body. Without ions in the air, our body could not process oxygen properly.

A lack or imbalance of ions affects the environment in which we live and breathe. Research shows that most of us who live, work, and travel in closed spaces suffer some degree of negative ion starvation or positive ion overabundance. This has become extremely evident to NASA in its space travel program.

People are spending their lives submerged in an atmospheric ocean of nitrogen, oxygen, and a small percentage of other elements, plus the toxins and pollution of our industrial world. In cities like New York, Los Angeles, Hong Kong, Tokyo, Mexico City, Karachi, Delhi, Bangalore, Mumbai, Calcutta, and many other densely populated cities, there may be few or no detectable negative ions at all during heavy traffic and high pollution periods.

In nature, abundant ions are generated wherever energy is transferred into the air by the friction within wind, rain, and surf. Certain events occurring in nature, such as lightning discharges, falling water, and air friction can cause electrons to be torn loose from a molecule. These orphan electrons are then adopted by other nearby molecules, which transforms them into negative ions. The parent particles become positive ions.

Negative ions carry the air’s electrical energy. Some examples of nature’s ion generators are solar (ultraviolet) and cosmic radiation, air friction, lightning, falling water (the splitting of water into droplets by waterfalls), ocean surf and waves, evergreens and Earth’s radioactivity (from natural radiation in rocks and soil).

The ion effect: Serotonin hypothesis

An excess of positive ions and a lack of negative ions can produce uncomfortable effects. Scientists have demonstrated that small air ions are biologically active. Moreover, they can stimulate the over-production of serotonin, a powerful neurotransmitter and very active neurohormone that causes profound nerve, glandular, and digestive effects throughout the body. Tests show that positive ions increase the production of serotonin and that negative ions decrease the hormone level.

High serotonin concentrations are associated with migraines. Negative ions accelerate the oxidative degradation of serotonin, whereas positive ions deactivate the enzymes that break it down. Thus more negative ions should reduce migraines. A higher serotonin level also produces tachycardia, higher blood pressure, bronchial spasms and even asthma attacks, increased intestinal peristalsis (intestinal contractions and dilations to push the contents through), increased sensitivity to pain, and increased aggression. Reduced serotonin levels result in a mentally relaxed state and reduce feelings of depression. Negative ions appear to reduce serotonin by enhancing monoamine oxidizing activity. Paradoxically, mental illness is often treated successfully with drugs that inhibit this activity and raise serotonin levels in the brain.

The three major effects of positive ion excess are irritation and tension, exhaustion, and a hyperthyroid response. The common symptoms of dizziness, headaches, depression, anxiety, and a generally lower level of physical and mental functioning were shown to be alleviated and, in most cases, reversed by increasing the negative ions in the air.

Positive ions

Many people find a pre-storm atmosphere heavy and oppressive. This has been attributed to the high levels of positive ions building up in the air, which are also believed to trigger storm-sensitivity in asthmatics and many other people. In the hours before a certain storm arrived, hundreds of people reported to hospital with severe asthma attacks. Was this due to positive ions?

Scientists have found that if the air is charged with too few negative and too many positive ions, we become anxious,tired, and tense. This positive-ion poisoning results from weather disturbances, central air conditioning, smog, and driving too long. It even has been linked to heart attacks, aggravated asthma, migraines, insomnia, rheumatism, arthritis, hay fever, and most allergies. However, a negative electrical charge imparts positive feelings of health and vitality.

Negative ions

Refreshing places, usually located in the mountains and near waterfalls and seashores, where health resorts are traditionally situated, have high negative ion concentrations. Areas with high levels of positive ions often make us feel uncomfortable and irritable.

In addition to providing a rewarding visual experience, waterfalls may be beneficial to our health. Those wishing to enhance their body and mind through breathing exercises should do so by a waterfall. Nearly everyone agrees that visiting a waterfall is a stimulating, refreshing, and energizing experience.

The energy produced by falling water causes negative ions, for as the falling water breaks into droplets, electrons (negatively charged parts of an atom) are separated from water atoms. These electrons combine with oxygen atoms in the air to create negative ions, which then are inhaled and absorbed into the bloodstream. Negative ions are not known to permanently cure anything. However, experts believe that they help our bodies by accelerating the delivery of oxygen to our cells. Some researchers believe that they may stimulate cells that regulate the body’s resistance to disease.

Plants grown in an ion-enhanced atmosphere show a marked increase in size and growth rate. Air-borne bacteria greatly diminish in number when there is a high negative ion count in the air. Synthetic materials, forced air circulation, improper humidity levels, excess static electricity, and a lack of fresh air all contribute to an ion imbalance. Natural negative ion levels should be maintained through full-spectrum lighting; natural materials on walls, floors, and furniture; windows that open to the outside; and living plants. These should be kept in mind when designing a place in which to live.

On average, 1,500 ions are found in a cubic centimeter (roughly the size of a sugar cube) of fresh air. Of these, about 45% are negative ions and the rest are positive ions. At Yosemite Falls in California, a reading of 100,000 negative air ions per cubic centimeter was recorded.

The fresh air after a thunderstorm, on a mountain top, or by the seaside are due to high negative ion concentrations. The reduced well-being often felt in highly polluted areas, cars, smog-enclosed areas, artificially air conditioned offices, or in hot dry weather conditions are usually due to an unduly low negative ion balance. Negative ions can be found in the billions on mountain tops, waterfalls, and by the sea. Radioactive substances in Earth’s crust and cosmic rays cause most ionization. But fire, crashing water, and plants during photosynthesis also produce negative ions. They give the air its invigorating freshness, which is so good for us.

Physiologically, the presence of negative ions in a sweat bath is as important as the heat. The discovery of negative ions in certain types of saunas a few years ago became headline news in Finland. Until then, the sauna’s healing power was attributed to relaxation and increased circulation. Now, negative ions add startling new possibilities.

Ions and our modern lifestyle

We now live in an environment that virtually eliminates negative ions. Rural areas have a higher concentration of ions, but many of us live in towns and cities that have very low levels due to dirt and pollution. Pollution from car exhaust, smoking, overcrowding, and even breathing all contribute to this.

Modern vehicles have many problems. For example, opening a window lets in polluted city air. Many drivers, especially long-distance ones, keep an ionizer in their vehicle to help them maintain a high level of alertness and concentration. In addition, this can relieve car sickness and remove pollen and smoke. In cities, closed rooms, cars and elsewhere, the proportion of negative ions is markedly reduced compared to what it is in undisturbed nature. According to experts, positive ions rob us of our good senses and dispositions, while negative ions enhance them, stimulating everything from plant growth to overall bodily well-being. In general, people who are sensitive to air-borne allergens will benefit far more and quicker from the cleansing action of negative ions.

A second potentially important factor is the person’s body voltage, for a high body voltage could alter considerably the ion ingestion rate. Perhaps the same effect as positive ion enhancement could be produced by a high negative body potential, even if the ambient air ion concentrations are balanced. Control and reduction of bodily voltage to a near-zero condition should reduce any such effects and restore ion ingestion due to the ambient air ion balance condition. For Muslims, body voltage to a near-zero condition is achieved when they prostrate during prayer.

Ironically, even today’s air-conditioned buildings, vehicles, and airplanes frequently become supercharged with harmful positive ions because the plastic and metal fans, filters, and air-conditioning duct systems strip the air of negative ions even before it reaches its destination. In addition, fluorescent lighting, electrical and electronic equipment, television screens, and static-producing as well as artificial fibers in carpets, clothes, and upholstery, all reduce the level of negative ions and increase the level of positive ions.

Desktop PCs have a cathode ray tube monitor that produces a positive static charge during normal operation. It also sweeps the nearby air of negative charges, depleting the negative-ion concentration in the immediate vicinity. Apparently when ion concentration is lowered by this or any other means, such as air conditioning, workers complain of headaches, lethargy, dizziness, and nausea. Tests conducted in England indicate that the more complex the task a person tries, the more he or she is affected by negative ion levels. Also, women are more responsive than men to negative ion depletion or enrichment.

The graph below provides some average sample readings of negative air ions taken in various locations. Note that the body responds to levels above 1,000 ions per cc.

Effects on our health

Besides cleaning the air, negative ions aid in mood elevation and increased oxygen intake, both of which make us feel more alert and energetic. Negative ions can provide major benefits for suffers of asthma, chronic fatigue syndrome, nervous energy, hay fever, allergies, sleep disorders and snoring, depression, emphysema, sinus, migraines, colds and flu, nausea, chemical sensitivity, fibromyalgia, cigarette smoke and other odors, and computers and office pollution.

Scientific studies

Research shows that negative ions can reduce histamine, which triggers hay fever; affect levels of serotonin, a neurotransmitter or a neurohormone associated with anxiety, stress, and migraines; help suffers of bronchitis, asthma, catarrh, the common cold, insomnia, migraines, emphysema, eczema, headaches, tiredness, and general feelings of malaise; speed the healing time of burns and surgical incisions with less cross-infection and reduced pain (including post-operative pain); enhance the body’s absorption and utilization of oxygen, thus assisting concentration and alertness; reduce the effects of passive smoking and allergies to pollen, dust, and pets; remove and destroy air-borne bacteria and viruses; and lower serotonin levels, which leads to greater calmness and strengthens defenses against infection, as proven with the flu.

Negative ions also increase hemoglobin/oxygen affinity so that the partial oxygen pressure in the blood rises while the partial dioxide pressure decreases. This results in a lowered respiratory rate and enhances the metabolism of water-soluble vitamins. In addition, negative ions increase one’s pH level, which makes bodily fluids more alkaline.

The effect of negative ion depletion varies from person to person. Negative ions in the bloodstream accelerate the delivery of oxygen to our cells and tissues, whereas positive ions slow this down and produce symptoms markedly like those in anoxia (oxygen starvation). Negative ions may stimulate the reticulo-endothelial system, a group of defense cells that marshal our resistance to disease. Treatment with negative ions has produced dramatic improvement in healing severe burns and reducing pain. Children, in particular, seem to respond quickly, for tests have shown that children breathing negatively ionized air were superior in incidental memory and had many difficulties in dichotic listening offset.

Offices and organizations having negative air ionization equipment have found that their employees are less likely to get colds or be absent, and generally are more cheerful and alert. Negative air ionizers are used in the closed and artificial atmospheres of submarines and spacecraft.

Conclusions

The Qur’an’s verses inspire people to make new scientific discoveries, as seen in 13:12, quoted above. Nature contains many sources of the negative ions that are so beneficial to people.

Reading and acquiring a deeper understanding of the Qur’an lead to many life-enhancing discoveries. Given the right conditions, healthy food and pure water, our bodies will usually right themselves and develop properly. But so often we neglect the air we breathe. Most of us live in environments full of invisible pollution and devoid of negative ions.

References

• Buckalew, L. W. and Rizzuto, A. Subjective Response to Negative Air Ion Exposure. Aviation, Space, and Environmental Medicine 53, no. 8 (Aug. 1982): 822-23.
• Negative Air Ion Effects on Human Performance and Physiological Condition. Aviation, Space, and Environmental Medicine 55, part 8 (Aug. 1984): 731-34.
• Fornof, K. T. and Gilbert, G. O. Stress and Physiological, Behavioral, and Performance Patterns of Children under Varied Air Ion Levels. International Journal of Biometeorology, no. 32 (1988): 260-70.
• Hawkins, L. H. Biological Significance of Air Ions. Proceedings of IEE Colloquium on Ions in the Atmosphere, Natural and Man-Made. BLL Conf Ind.
• Inbar, O. et al. The Effect of Negative Air Ions on Various Physiological Functions during Work in a Hot Environment. International Journal of Biometeorology 26, no. 2 (1982): 153-63.
• Kreuger, A. P. and Reed, E. J. Biological Impact of Small Air Ions. Science, no. 193 (1976): 1209-13.
• Kellogg, E.W. Air Ions: Their Possible Biological Significance and Effects. Journal of Bioelectricity 3, nos. 1 and 2 (1984): 119-36.
• Kornblueh, I. H., Piersol, G. M., and Speicher, F. P. Relief from Pollinosis in Negatively Ionized Rooms. American Journal of Physical Medicine, no. 37 (1958): 18-27.
• Kornblueh, I. H. Aeroionotherapy of Burns. In Bioclimatology, Biometeorology and Aeroionotherapy. Gualtierotti et. al., eds. Milan: Carlo Erba Foundation, 1968.
• Soyka, Fred (with Alan Edmonds). The Ion Effect. E. P. Dutton & Co, 1977.
• Sulman, F. G. The Effect of Air Ionization, Electric Fields, Atmospheric and Other Electric Phenomena on Man and Animal. Springfield, IL: Charles C. Thomas, 1980.
• www.aranizer.com/ions.htm. Negative Ions.
• www.consultces.com/ions.htm. (information on ions)
• www.odatus.com/ions.html. (negative ions)
• www.pentax.com/ion_explain.htm. (negative ions)
• Yaglou C. P., Brandt, A. D., Benjamin, L. K. C. Physiological Changes during Exposure to Ionized Air. Heating, Piping, Air Conditioning 5 (1933): 423.
• Yaglou C. P. and Benjamin, L. K. C. Diurnal and Seasonal Variations in Small Ion Content in Outdoor and Indoor Air. Heating, Piping, Air Conditioning 6 (1934): 25.

A brief history of lasers

During the nineteenth and twentieth centuries, scientists made many improvements to our life. One of the most important was a more accurate understanding of light, currently defined as traveling electromagnetic waves. Like the ocean’s waves, light also has an amplitude (which determines its power) and a frequency (which determines its color and energy). The better we understand light, the more uses we find for it in our life. For example, today we are faced with many technological devices based on light, such as printers, CD writers and readers, and fiber optic devices for telecommunications.

Many scientists are very interested in photons, for they can be used in communication, computation, and many other fields. Also, many researchers think that the technology of the future will be built on optoelectronics”photons and electrons.

The invention of lasers is a very important step in the science of optics. While lasers started out as a major component of science fiction stories, science fiction is rapidly becoming scientific reality due to continual improvements and discoveries.

Lasers defined

By definition, a laser is amplified light. However, its amplification is very different from a normal amplification, for this amplification makes the photons coherent by causing them to have the same energy and same direction. Such coherence enables a laser light to travel over long distances without diverging. If the laser beam is kept in a dispersionless media, theoretically it can keep the same waist size forever. However, the only media that currently can serve as a dispersionless media is a vacuum.

In a laser system, many atoms have to have electrons in the same high energy levels. If this is the case, any effect that stimulates the atoms’ system will emit coherent light. For the emission to continue, the system should be constructed so that there are always some electrons changing their energy level.

Observing several laser systems will give us a clearer understanding of lasers.

Ruby lasers

The first lasing structure was the ruby crystal (see Figure 1), devised by Dr. T. H. Maiman in 1960. This was a surprising development, for researchers thought that gases would be the first lasers. The ruby crystal is Al2O3 (called sapphire), and has an impurity level of 0.05% Cr+3 ions.

The ruby laser consists of a ruby crystal surrounded by a flash tube enclosed within an aluminum cylindrical cavity that is cooled by forced air. The laser cavity is pumped by a flash light. When the light’s power exceeds a certain limit, it begins to re-excite some ions inside the ruby crystal to higher state. The cavity ends are coated with evaporated silver. However, one side has a lower reflection ability so that some light can pass through it.

Gas lasers

Most elements and many molecules can be made to lase in a gaseous state. The first example of a gas laser is the HeNe (helium neon) laser, as depicted in Figure 2. In a high voltage tube, colliding helium and neon atoms transfer energy to neon atoms, which then assume a meta-stable state. After this, spontaneous emission occurs when neon atoms transit from a higher energy level to lower energy level. Like other lasers, the HeNe laser also needs to have a population inversion. The high population for neon’s meta-stable state is achieved by applying a high voltage to the tube. Although the stimulated emission decreases the number of atoms in the meta-stable state, the high voltage pumps the system back into the population inversion condition.

Having many different wavelengths (colors), HeNe laser are useful for all sorts of applications, from semiconductor technology to construction leveling.

Improvements in semiconductor technology have made many contributions to laser technology. Data storage on CDs, computer, printers, and telecommunication tools are just a few examples of the places where semiconductor lasers are used.

Semiconductor lasers

Three different materials have the properties necessary to serve as electron (carrier) conductors: metals, insulators, and semiconductors. Metals are good conductors for carriers, whereas insulators do not conduct electricity. In a solid state material, electrons stay in the bands determined by the attraction between positive and negative charges (electrons and nucleus). The further band for an electron is called the conduction band. In metals, the conduction band is partially filled, while in insulators the conduction band is totally empty. There is also a very large energy difference between the conduction band the valence band (the band just before conduction band). Thus, a large amount of energy has to be supplied in order to produce some carriers in the conduction band.

Conduction occurs when electrons are present in a conduction band, for they are somehow free in that band. They are not so free that they can escape it, but they are free enough to walk around in it. Research is revealing many other surprises or gifts that the All-Wise Creator has put in front of us.Our discovery of certain materials’ ability to serve as insulators and/or conductors has made our life much easier.

A very important step in the field of semiconductors is the use of optics during experiments. The electron in the conduction band can loose energy by radiating light, and one can use this energy to build lasers. The laser’s wavelength mainly depends on the energy gap between the conduction and the valence bands. If this energy gap is known, researchers can grow appropriate semiconductor structures to lase.

As growth techniques for semiconductors improve, the quality and variety of semiconductor lasers increase. Early semiconductor lasers were built from bulk structures. But after the 1980s, scientists discovered that layering different semiconductors could increase optical efficiency. The commercial state-of-art now is semiconductor quantum well lasers. In these structures, the electron’s mobility is restricted on a plane, giving carriers a two-dimensional freedom. Lasers using quantum dots (quasi-zero dimensional structures with superior optical properties) also have appeared during the last 5 years.

Conclusion

To see how our life will change via improvements in optics, just look at how fast communication has become, thanks to telecommunication lasers. Old thick and slow copper wires are being replaced by fast thin fibers. A computer and a camera gives one access to visual telecommunication via the Internet. All of this used to belong to science fiction. Not any more!

I believe that one we will develop a technology to transport material instantly, as stated in Qur’an: One who had knowledge of the Book said: I will bring it to you within the twinkling of an eye! When (Solomon) saw it placed firmly before him, he said: This is by the Grace of my Lord! – to test me whether I am grateful or ungrateful! If anyone is grateful, truly his gratitude is (a gain) for his own soul. But if any is ungrateful, truly my Lord is free of all needs, supreme in honor! (27:40).

In conclusion, we have to learn how to read the Book of the Universe and to understand it so that we can make even more beneficial discoveries.

References

• Arakawa, Y. and H. Sakaki. Multidimensional Quantum Well Laser and Temperature Dependence of Its Threshold Current. Appl. Phys. Lett. 40, no. 11 (June 1982): 939-41.
• Davis, Christopher C. Lasers and Electro-Optics: Fundamentals and Engineering. Cambridge Univ. Press: 1996.
• Hecht, Eugene. Optics. 4th ed. Addison-Wesley: 2001.
• Hitz, Breck et al. Introduction to Laser Technology. 3d ed. IEEE: 2001.
• http://home.achilles.net/~jtalbot/
• Kirstdter, N. et al. Low Threshold, Large T Injection Laser Emission from (InGa) as Quantum Dots. Electron. Lett. 30, no. 17 (Aug. 1994): 1416-17.
• Ledentsov, N. N. et al. Quantum-dot Heterostructure Lasers. IEEE J. Select. Topics Quantum Electron. 6 (May-June 2000): 439-51.
• Maiman, Theodore. The Laser Odyssey. Laser Press: 2000.
• Svelto, Orazio (ed.). Principles of Lasers. Translated by David C. Hanna. 4th ed. Plenum Publishing Corp.: 1998.

These words attempt to pierce the veil of habit that develops in our minds from not looking into the reason for things. The perfection of the order operative in the universe is of such a degree that it prevents us from being aware of it. In the same way, we only become aware of the faultless operation of the watches we have worn on our wrists for years when they stop working.

In the world-view developed upon the foundation of Newton’s laws of motion, the universe was likened to a flawlessly operating watch. Events were tied to one another in a cause-effect relationship and our knowing the laws of this relationship allowed us to predict events with great accuracy. It was possible to determine with mathematical exactness a wide range of phenomena, from the times of eclipses of sun and moon to the amount of fuel and the speed needed to put an object into orbit around the earth. The success of these ‘natural laws’ led many people to believe that they completely expressed and ‘ruled’ the whole order of the universe.

Because God creates and sustains all things and events from behind the veil of universal general laws, because certain events (causes) are followed reliably by similar events (effects) each time they (the causes) occur, it begins to be supposed that the causes are responsible for or ‘create’ the effects. This is, of course, a gross error, as no number of causes suffices to create even a little effect; for every event even the tiniest, the whole universe must be presupposed first, including the laws operative within it. Moment by moment, all things and all events are created and sustained by God, Who wills from an infinite range of alternative possibilities a particular actuality.

The clockwork model of the universe derived from Newtonian or classical physics is not a complete account of the phenomena which we observe in the universe. Already in the late 19th century, scientists had been bewildered by the lines that turned up in the light spectra emitted by heated gases: the steady, stable clockwork model predicted did not happen. Also, there were problems explaining the behaviour of light: sometimes it made more sense as a beam of particles, sometimes as a wave.

Today our understanding of the universe is very far from the ‘clockwork’ model. The shift in understanding occurred in the first quarter of the 20th century, beginning in 1900 with the publication of Max Planck’s work on radiation. The problem Planck worked on for six years was that the actually measured radiation from hot bodies did not conform to the values predicted by the classical theory. He put forward the suggestion that bodies radiating energy did so, not evenly and continuously, but unevenly and discontinuously in tiny packets or ‘quanta’. So startling was this suggestion that, despite confirmation by experiment, Planck himself thought of his theory as solving the problem of radiation by a sort of trick.

But then, in 1905, Albert Einstein published an article using the notion of packets of energy of definite sizes to explain how electrons are ejected from metal when light (radiation) falls on it. Whereas classical theory had predicted that the voltage (measure of the energy of the electrons ejected) would be proportional to the intensity of the light (radiation), Einstein showed that it was proportional instead to the frequency of the radiation. The conformity of this explanation with experimentally observed results gained Einstein the Nobel Prize. (Einstein didn’t receive the prize for his famous theory of relativity.) The significance of these findings and theories was not fully appreciated at the time.

A few years later in 1910, Ernest Rutherford did a ground-breaking experiment. He bombarded a thin layer made up of gold atoms with high energy particles and showed that the atom contained an extremely small positively-charged nucleus with negatively-charged electrons moving around it. Following the classical physics model, these electrons should have been small particles orbiting the nucleus in the same way as the planets orbit the sun, steadily losing energy until they fell on to the nucleus-in other words, the atom should have been unstable. Again it was a rejection of the classical model, three years later, by Niels Bohr, that helped solve the problem. Bohr argued that the electrons must move in fixed orbits until deflected by the absorption or emission of a unit of energy.

Atoms emit radiation after various external signals and only at specific wave lengths. As Einstein said, every different color of light is composed of energy packets inversely proportional to its wave-length (frequency). Because the Planck constant (h) is very small, the energy of these packets is also very, very small. For example, a normal light bulb emits 1020 light packets (photons) a second. Each of these photons is created when an activated atom or molecule passes to its normal or ‘basic state.’ Thus light, which allows us to see and which is a basic building block of life, develops as a result of the motions (in wave form) of electrons. The concepts of classical physics could successfully explain many of the events of daily life, but it couldn’t explain events on the subatomic level.

During those years (1910-1925) physics fell into a state of

confusion because of the many measurements that conflicted with general theory and could not be explained by it. This situation was to lead W. Pauli (later to discover the principle fundamental to the understanding of the structure and characteristics of elements) to say he would rather have been a singer or gambler than a physicist. Actually in order to explain the observations being made, the whole way in which physical events had been understood required fundamental revision by wholly new methods. This was achieved by Werner Heisenberg, a 24 year-old physicist described by his teachers as a person who dealt with the essence of a subject rather than getting bogged down in detail, a person with powerful concentration and ambition. Perhaps the success of this young mind can be explained by the critical perspective he developed through reading the works of great men such as Kant and Plato, which was later supported with sound knowledge he got from great physicists. Heisenberg, who relaxed from work by climbing rocks and reading poetry, said: ‘It was around three in the morning when the calculations were completed and the solution to the problem appeared in front of me. First I experienced a great shock. I was so excited that I didn’t even think about sleeping. I left the house and, sitting on a rock, I waited for the sunrise.’

Like the other scientists who established quantum physics, Heisenberg was a philosopher-physicist. The philosophy he accepted and advocated that allowed him to interpret atomic events is as follows: ‘Even though it is successful with classical physics, the language we use to explain physical events in the atom or its surroundings is insufficient. For this reason, after making a specific measurement in a quantum system (for example, an atom), using that knowledge we can get a theory that will tell us what kind of results we can find in the next measurement. But it’s not possible to say anything about what takes place between the two measurements.’

What pushed Heisenberg to make such a statement was that the mathematical tools he used to develop a theory that could explain the observed discontinuity of energy in light and atoms were abstract concepts that had not been used before. In classical physics the numbers we know were used to give value to matter’s position, speed, size, etc. In Heisenberg’s quantum mechanics, these sizes were expressed with infinite dimensional n x n matrices which enabled physicists to calculate the properties attributed to electrons (energy, position, momentum, angular momentum) in an approximate way. Because these abstract mathematical expressions didn’t have an equivalent in everyday spoken language, it wasn’t possible to approach them with a classical understanding. It was observed that in order to measure the position of an electron, the experimenter necessarily altered its velocity. This problem was formally expressed in 1927 in Heisenberg’s famous Uncertainty Principle.

Independently of Heisenberg, Erwin Schrodinger made another significant breakthrough in mathematical description of electrons. Inspired by the hypothesis put forward two years earlier by De Broglie about the wave properties of matter particles, Schrodinger developed a ‘wave mechanics’ by which the movement of particles could be calculated. (figure: 1) But the fundamental question remained as to what these strange and original ‘waves of matter particles’ or ‘waves accompanying matter particles’ were.

The mathematical formulations devised by Heisenberg and Schrodinger are complementary in the sense that physicists use whichever best resolves the particular calculations they are trying to make. There is no formally distinct space between the scientists and the phenomena they are seeking to understand and manipulate: their means of observation and manipulation (the mathematics) in some sense ‘posit’, put in place, the very phenomena whose place (among other properties) they are trying to determine. Alongside the notion of an infinite array of rows and points, as invented by Heisenberg, to plot the position or motion of a sub-atomic particle, physicists and philosophers of physics have begun to speak of arrays of events or ‘stories’ to try to explain, in something resembling ordinary language, the ideas they are handling. This cannot be described as a world-view in the way that the Newtonian physics confirmed and sustained a world-view, but it is nevertheless a clear and distinct disposition which, instead of excluding God as the Force Who wound up the clockwork and then retired from His creation, admits the in-completeness and uncertainty of human knowledge as a structural element of reality-in other words, the uncertainty is not a function of our present ignorance (to be relieved by future knowledge), but an actual constituent of the way reality is.

Quantum physics, at least figuratively and metaphorically, has became a vehicle for the interpretation of such concepts as matter, beyond-matter, energy, existence and non-existence in a way nearer to Divine sources; and led to many physicists settling accounts with their conscience and turning towards God Who is understood to be simultaneously transcendent and immanent, there and here.