How Octopuses Are Able to Taste by Touching

Giesen et al.Molecular Basis of Chemotactile Sensation in Octopus. Cell, October 2020.

Octopuses have often captured human interest with the ability to use their eight suction-cup covered tentacles for touch and taste. Scientists have wondered for decades how their appendages work but very few have studied what happens on a molecular level. In a new report, researchers got a glimpse into how the nervous system in an octopus’ tentacles manage these functions. They identified a novel family of sensors in the first layer of cells inside the suction cups that have adapted to react and detect molecules that do not dissolve well in water. The chemotactile receptors on these sensory cells use those molecules to help the animal figure out what it is touching and whether or not that object is prey. This allows an octopus to distinguish between a rock versus a tasty crab. The underlying mechanism is that there are two types of sensory cells in the suckers that line their tentacles: mechanosensory cells for touch and chemosensory cells for taste.  Both taste- and touch-oriented cells are critical for helping octopuses to decide when to hunt and when to retreat. It is well known that particles on land easily travel through the air before they might be sniffed by a bear or a wolf’s nostrils. However, the process of smelling or tasting is much less clear in cephalopods that live in the ocean. Some chemicals can travel far from their underwater source and thus make it possible for some creatures to catch a smell of their prey from afar. But for chemicals that don’t move through the ocean easily, a touch-taste strategy can be useful for marine animals, including octopuses. While people tend to perceive five basic tastes – sweet, bitter, sour, salty and umami (meaty) – octopuses experience the world of taste differently. Instead, scientists found the most success by stimulating octopuses to respond to what are called terpenoid molecules, a secretion that is often released by marine invertebrates that functions as a defense or warning signal. They smell these molecules and can, in a way, smell fear in their prey.

Natural Forest Regrowth May Be the Best Method to Combat Climate Change

Cook-Patton et al. Mapping carbon accumulation potential from global natural forest regrowth. Nature, September 2020.

Reforestation has been considered the leading strategy in the fight to mitigate the effects of climate change with previous studies highlighting the role it can play in capturing and storing atmospheric carbon. There are many ways to incorporate trees into our landscapes, however one of the cheapest and easiest options is to allow forests to regrow on their own if conditions can permit them to. Now, a new study has mapped the potential carbon accumulation in naturally regrown forests over the next 30 years. Researchers from 18 countries brought together more than 13,000 georeferenced measurements of carbon accumulation to generate a wall-to-wall, one-kilometer-resolution map spanning 43 countries that highlights areas with the greatest carbon returns if trees were allowed to reforest naturally. The team demonstrated that natural forest regrowth can capture up to 23 percent of global carbon dioxide (CO²) emissions from the atmosphere every year. This is on top of the carbon sequestration already provided by existing forests, which absorb around 30 percent of annual CO² emissions. The biggest advantage of natural restoration of forests is that it often requires nothing more than human inaction. Nature is constantly at work doing its duty to restore forests often unseen on the edges of fields, on abandoned pastures, and wherever forests lie degraded or former forest land is abandoned. Moreover, natural forest regrowth may promote the re-establishment of local tree species that are best equipped to survive in a given location and support the many organisms that eat them or dwell amongst their branches and roots.

However, natural regrowth may not always be the answer. For example, at sites that are highly degraded, or seed sources are far away, actively planting trees can help to start or speed recovery while helping to establish the right species mix for current and future conditions. While planting trees can sometimes be necessary it should usually be the last option since it is one of the most expensive and often least successful methods of combating climate change. It is estimated that humanity should collectively plant about a trillion trees over the next three decades to effectively fight climate change, which averages out to about a thousand new trees planted in the ground every second and assumes that every tree survives and grows in a healthy manner. Once the cost of nurseries, soil preparation, seeding, and thinning are accounted for, it would easily cost hundreds of billions of dollars. If natural forest growth is cheaper and better then why not work to protect the existing trees and let forests to grow on their own?

Li et al. Innate connectivity patterns drive the development of the visual word form area. Scientific Reports, October 2020

A new study suggests that humans are born with a part of the brain that is prewired to be receptive to seeing words and letters. Researchers analyzed brain fMRI scans of 40 newborns and found that the “visual word form area” (VWFA) was already connected to the language network of the brain, which is akin to the scans of 40 adults. These findings are quite surprising considering some researchers had hypothesized that the pre-reading VWFA starts out like any other part of the visual cortex that are sensitive to seeing faces, scenes, or other objects and only becomes selective to words and letters as children learn to read or at least as they learn language. However, a new study shows that even at birth, the VWFA is more functionally connected to the language network of the brain than it is to other areas. It is likely that experience with spoken and written language will strengthen connections with specific aspects of the language circuit and further differentiate this region’s function from its neighbors as a person gains literacy. The main goal of this study is to learn how the brain becomes a “reading brain” and to help understand the differences in reading behavior, which could become useful in the study of dyslexia and other developmental disorders.

Truffles are potato-shaped underground mushrooms that grow in all kinds of different environments ranging from high-rise forests of pine, oak, linden, fir and wild hazelnut to scrubs, under bushes, and in steppes and deserts. They maintain a symbiotic relationship by attaching to the roots of certain herbaceous plants and have a unique aroma with a sharp odor. Some cultures nickname truffles as bingos or buckthorns. There is also the belief that the mushrooms sprout faster under lightning or thunder thus earning them the nickname “daughters of thunder.”

Symbiotic association between truffles and plants

Nature thrives in a harmony that is based upon assistance and solidarity. Truffles have a special place in this harmony. For example, as plant seeds germinate and begin to grow into roots, the hyphae of truffles wrap around the plant roots, just like a glove does around fingers, and help the emergence of a special structure called “mycorrhiza” which facilitates food exchange between truffles and plants. Approximately 90% of plants coexist with different types of mushrooms, and some plants even need truffles to survive. Unable to photosynthesize, truffles need plants for organic nutrients, and plants need truffles, especially for the intake of more water and minerals from barren and arid soil.

It is estimated that the mushroom hyphae can be as long as 1 km in the forest soil is estimated to be more than 1 km. Truffles help to increase the contact surface of the tree roots with the soil hundreds of times while ingesting the water and minerals from remote areas where plant roots cannot reach. In this way, as soon as a drop of rain falls on the soil, it is relayed to the benefit of plants with hyphae that are invisibly thin and kilometers long. If this partnership did not exist between truffles and plants then the giant trees that we see in forests would not be able to grow tall enough and would possibly remain as bushes due to a lack of water and minerals from the soil.

Truffles and wildlife

A similar relationship exists between truffles and animals in the forest. Since they are generally active at night and cannot benefit from sunlight sufficiently, wild animals meet their vitamin D needs especially from truffles, an important food source. Recent studies show that some wild animal species survive solely on truffles. A large number of mice, squirrels, bears, deer, rabbits, hedgehogs, and bird species in the US eat truffles along with some monkeys, kangaroos, and bird species in Australia.

While the toadstools in the open can spread their billions of spores to the environment, the spores of underground mushrooms remain confined in their tissues. It is thanks to animals that can spot and extract the mushrooms that these spores spread from their tissues into the rest of the environment. Wild animals can locate, dig up, and eat underground truffles due to the strong and attractive aroma of the mushrooms. On the other hand, the spores that are expelled from the animals’ digestive systems lead to the production of fresh hyphae to partner with new plants via germination. This allows underground mushrooms to have the opportunity to sustain their generation and expand their natural habitat.

The conservation of animal species that face extinction also depends on the preservation of the variety of truffle species. From this point of view, truffles in the natural habitats are the sustenance of wild animals. Bediuzzaman Said Nursi (d. 1960), a renown Turkish religious scholar, said: “Our share is in vineyards and gardens. God Almighty allocated our sustenance there. These wild fruits are the sustenance for the wild animals. We should not touch their portion.” It is also known that Bediuzzaman discouraged his students who came across plenty of apple and pear trees on the mountains from eating those fruits. This approach also sums up a guiding insight about sustainable forestry and ecosystem.

Nutritional value and medical benefits

Truffles are richer in protein and minerals than other mushrooms. Their nutritional value consists of 53-76% water, 9% protein, 7% carbohydrates, and 8% minerals. Although they have high nutritional value, the most important feature making truffles superior to other mushrooms is their distinctive aromatic compounds. Due to their unique aroma, truffles attract the attention of many gourmets. It is no surprise that truffles have an exceptional place in exclusive cuisines.

Since ancient times, the medical benefits of truffles have been frequently reported. For example, Ibn Sina (Avicenna) is known to have recommended truffles for healing weakness, nausea, pain, and wounds.

Prophet Muhammad, peace be upon him, said, “Truffle is a sustenance like manna. Its sap is also a cure for the eyes.”

The belief in the nutritional value of truffles is also common in the Christian world. Between 827 and 844, Pope Gregory IV had advised the consumption of truffles to gain strength in battles.

Current studies have found that truffles contain several compounds that are essential for human health. A study published in 2016 is an important step for chronicling the fact that the extract obtained from truffle mushrooms proved to be useful in healing eye infections.

Economic value

The number of commercial-value truffles collected from natural habitats constantly decreases worldwide: it has dropped from 2000 tons in 1884 to 100 tons in 1990. Today, it is around 40 tons. The main factors of this decline are the destruction of oak forests, climate change, environmental pollution, global warming, and uncontrolled picking.

Despite the dramatic decrease in the number of truffles collected from natural habitats, they are sold between $250 and $4,000 per kilo depending on the type and quality.

Growing truffles

Under current conditions, truffles have to be grown by special means. People must grow the types of truffles that they wish to consume.

The first idea for the production of truffles came from a French farmer named Joseph Talon. At the beginning of the 19th century, Talon planted fresh seeds in the oak patches where truffles grew naturally. The existing truffle hyphae in the soil infiltrated the roots of new oak saplings and led to an increase in the production of truffles in the natural habitat. In the following years, Talon created new truffle production areas by planting the saplings he had already produced in other patches. Talon’s method is still used today.

In the 1960s, a period when there was a great decrease in the production of truffles in natural habitats, studies were conducted to find new methods. The methods developed by French and Italian scientists in the 1970s led to a massive success in truffle production. Truffle spores were inoculated at the root of oak saplings and plants were grown in greenhouses to develop only the desired truffle mycorrhizal system in tree roots. Having ensured that mycorrhiza had settled in the roots, the first truffle began to be harvested four or five years after planting the oak saplings in open areas. These methods have allowed truffle production in countries such as Australia, the USA, and New Zealand where truffles are not grown naturally.

Commercial truffle types

It is estimated that there are about 10,000 different types of truffles in the world with different sizes, colors, structures, and aromas. These mushrooms, which are now listed in restaurant menus and stocked on the shelves of luxury food suppliers, are only some of the truffles numbered in thousands.

Some of the commercial types are listed below:

Tuber magnatum: Known as the white truffle of Italy, it grows in the Alba region as attached on the roots of oak, hornbeam, pine and poplar trees. It is different from all species by its peculiarly pungent aroma. It is known as the most expensive food in the world because it grows in a very limited area and cannot be grown as a cultivated mushroom.

Tuber melanosporum: Known as the winter black truffle, it grows during winter by attaching to the roots of oak, hazelnut, and pine trees in Italy, France, Spain, and the Balkans. It has a distinctive aroma and has a wider growth area as compared to the white truffle. It is the most cultivated type of truffle in different continents of the world.

Tuber aestivum: Known as the summer black truffle, it grows by attaching to the roots of oak, nut, and pine trees in a wide geography spanning from Portugal to Azerbaijan, Morocco to Poland, and Sweden to Afghanistan. It bears lower economic value because it is widely grown and has an easily extracted culture and a lower-density aroma.

Terfezia claveryi: It grows in the spring across steppes and deserts by attaching onto the roots of herbaceous plant species belonging to the genus Helianthemum. It has a unique aroma and has a huge market in the Arab countries. Its culture has started to be extracted in recent years.

Oregon truffle: It grows in winter as attached on the roots of fir trees in Oregon, Washington, and Vancouver. It has white and black types. It has an important market in the U.S despite not being as valuable as the black and white species found in Europe. No results have been obtained from cultural studies yet.

Harvest of truffle

Picking truffles is like picking apples from a tree with the difference that truffles are collected from the root of the tree. It is difficult to understand whether the truffle underground has ripened or not. If the extracted truffle is not ripe enough then its economic value immediately suffers. That is why special dogs are bred to locate truffles. Sensitive to the truffle aroma, these dogs lead their owners by simply pointing out to the places where ripe truffles are found. These dogs are motivated by rewards and are encouraged with better rewards for finding higher quality, larger, and more ripe truffles.

References

• Alhussaini S.M., Saadabi A.M., Hashim K., Al-Ghanayem A.A. (2016). Efficacy of the Desert Truffle Terfezia claveryi to Cure Trachoma Disease with Special Emphasis on Its Antibacterial Bioactivity, Trends in Medical Research, doi: 10.3923/tmr.2016.28.342016, Volume: 11, Issue: 1, pp. 28–34.
• Bukhari, 5708; Muslim, 2049; Abu Dawood, Tibb, 12; Ibn Majah, Tibb, 8.
• Hall I.R., Brown G., Zambonelli A. (2008). Taming the Truffle: The History, Lore, and Science of the Ultimate Mushroom, Timber Press.
• Sahiner Necmeddin, Son Sahitler, Istanbul: Nesil Yayinlari, 2011, Volume 1, pp. 113.
• Trappe M, Claridge AW (2010). “The Hidden Life of Truffles”. Scientific American. April 2010: 78–84.
• Wedén C. (2008). Tryffel. Infotain &Infobooks Sweden AB, Stockholm.

Some insight for leaves

Leaves are in charge of respiration in plants. They consist of the main mechanism producing food for plants, using sunlight via photosynthesis through which food for many more organisms, animals, and humans are provided. Having been assigned to convert solar energy to food, which they’ve been doing for millions, perhaps billions, of years, plants have been a significant instrument for sustaining life on or planet. It is as if plants turn their leaves upward in prayer to ask for food on behalf of all living things.

Morphology of a leaf

Leaves are composed of three sections: the base, blade, and petiole. The blade is the most important part of the leaf; it is wide and flat. The exact shape of leaves vary according to climate, geographical conditions, life span and risk of consumption by other organisms. In tropical climates, the blade is often very wide. In drier climates, it is usually smaller, in order to reduce water loss.

Leaves of some plants undergo a transformation called “metamorphosis” to fulfill different tasks. For example, some leaves have a thorny shape and protect the plant form herbivorous animals. Some leaves are designed to store water, and some are converted into a trap in order to capture insects to nourish the plant.

On the cross section of a leaf, one can observe that four layers constitute the inner part. The first one is the epidermis, which covers the leaf from top to bottom. This layer protects the leaf against external elements and is lined with a waterproof, waxy substance.

The palisade parenchyma is located on the upper side of the inner tissue and it houses chloroplast rich cells, which are lined up densely and carry out photosynthesis. The spongy layer under the palisade tissue forms the intercellular air spaces and this layer is responsible for the respiration of the plant.

For photosynthesis to occur, the leaf needs to receive the maximum amount of sunlight. The sun must hit the leaf at a perpendicular angle; thus, the leaf must be amply wide and must sit level. Because the sun hits different latitudes at different angles, plants have branches of different lengths facing different directions, and leaves have different curvatures. Furthermore, leaves are also lined up in a way so as not to block the sun’s rays. For this to happen, it is required for the leaf base to be thin and the leaves to be lined up in a spiral fashion that enables both lower and higher ones to harvest sunlight in the most efficient way. This type of arrangement exemplifies the golden ratio, which is observed among many structures in nature.

Each leaf sprouts at an angle of either 222.5 or 137.5, derived from division of 360 degrees, from the previous leaf under. This spiral leaf growth provides them with the most suitable place to harvest sunlight maximally. This way the gaps around branches are minimized and a maximum number of leaves is positioned without reducing the light capture capacity of the plant.

Seasons and leaves

Plants work like factories during spring and summer, producing a great deal of food through photosynthesis. Some of these foods help the plant grow and some are stored as starch for winter. With the onset of autumn, a majority of plants outside tropical zones go through hibernation, like many organisms do, and enter a dormant period. In order for plants, like trees and bushes, to survive the cold, their leaves are shed to minimize their surface area and conserve energy. Perennial green plants lose their aerial parts, too, including stems and leaves, and hibernate underground as roots, bulbs, and tubers. They sprout back from their roots once spring brings warmer weather.

Many leaves begin to fade and fall once autumn arrives. The leaves of some hardy plants – like cypress, pine, and spruce trees – continue to function through winter. In some of these trees, like the bay tree and the Indian sandalwood, there are protective layers covering the leaves against the cold. Other leaves, like pine needles, are created in a spiny shape to resist the cold.

Colors of autumn

Leaves seem green during the spring and summer months because the chlorophyll found in them absorbs all wavelengths other than green. The other major pigments found in leaves are carotene (orange) and xanthophylls (yellow). These two pigments are the most common pigments in nature.

As autumn approaches, and photosynthesis begins to end, chlorophyll starts to degrade and the other pigments begin to show. Thus, leaves turn yellow and bright red.

As the weather gets colder, the chloroplasts that are near the leaf’s bottom are broken apart, and sugar levels begin to elevate. The sugars produced during this season accumulate in the leaves day by day due to lower photosynthetic speed and reduced transportation to other parts of the plant. These sugars are converted into anthocyanins. At first, leaves appear yellow. A couple weeks before they fall, most leaves shift from yellow to red. Under abundant sunlight, due to concentrated anthocyanins, leaves seem brighter and more colorful – and thus red. Once the live tissues die completely, all leaves turn brown. This is due to the high concentration of tannin.

Leaf color varies not only because of plant genetics and external factors, but also because of climate. Temperature, humidity, soil composition, and levels of sun exposure all affect color. There is a higher degree of color change in the leaves of trees that grow in lower temperatures.

The composition of soil plays a major role in the color of leaves. Leaves that turn yellow early indicate a nitrogen shortage; on the other hand, the presence of a strong red color indicates very acidic soil. A high alkaline ratio is present in places where leaves are purple.

Walking among fallen leaves and the colorful scenery in a forest in autumn can trigger unique emotions. Depending on the psychological state of a person, the colors of autumn sometimes remind us about the briefness of this world, but they can also hint at the infinite life to come.

The motifs and patterns of leaves

Receiving sufficient sunlight is a significant matter for leaves. Therefore, they are created differently. No two plant leaves are the same.

Some of the leaves are simple and some are compounds. According to their arrangements, opposite, alternate, whorled, and rowed forms exist. Leaf blades can be ovals, kidneys, triangles, or even hearts. Edges can be smooth, serrated, toothed, or lobed. Leaf veins can also have many different motifs.

Each plant species has its own leaf motif. The alfalfa leaf has a triple pattern of specific angles; walnut leaves have an opposite arrangement of eight to ten. A hand-like motif, like the fingers of a praying hand, formed of seven leaves, can be observed on chestnut trees.

In the northern hemisphere, where annual average rainfall is around 100 kg per square meter in cold and dry regions, boreal forests, with needle-leaf trees, dominate. The southern hemisphere is dominated by savanna; bushes and meadows occupy millions of hectares.. In these regions, natural fires can be the most important factor of ecosystem changes. When looking at the results of these fires, it sometimes seems they were preprogrammed as to when, where, and how they spread.

Examples of fire dependent ecosystems

The cone of the Jack Pine species (Pinus banksiana), which is widely distributed throughout North American forests, requires absolute forest fire in order to release its seeds. The cone of this species can remain on the trees without releasing seeds for years because of climate and the resin layer covering it. Seeds preserved in the cones wait for the next fire; the cone’s scales open with the heat generated during such a fire. The seeds then start their journey towards a piece of soil that they can grow into. Here the role of fire is very important, not only for the dispersal of seeds but also in preparation of germination. The high humidity and low temperatures in the forests of these regions delays the decomposition of fallen leaves. This layer of dead material over the mineral soil is another hindrance for seeds to meet the soil. When scales of the cones open with the help of forest fire, this thick layer of dead leaves is also removed, having burned down to create fertile new soil.

Another example of fire benefiting plants is the chaparral vegetation of the North American forest. This type of plant cover is composed of short, perennial wooden plants and annual non-woody plants. During the hot, dry weather of summer, this vegetative cover becomes particularly vulnerable to fire. A dark black cover composed of unburned parts, frames, and ashes of the plants is left behind. This sight, which is saddening at first, actually hides various beauties in it, and these beauties only emerge after a series of events.

Golden eardrops (Dicentra chrysantha), which is a member of the perennial Chaparral family, is deeply affected by fire. The seed of this plant requires a fire event in the germination season and should be exposed to smoke for at least 10 minutes.

The positive effects of forest fires can also be seen in the healthy survival of an ecosystem. Due to its thick bark, the widely distributed Ponderosa pine (Pinus ponderosa), of North America, is minimally affected by the low, medium level cover fires that happen every five to twenty years. The weak and unhealthy individuals in this dense forest get burned as a result of natural forest fires, leaving healthy, thick barked trees. This way, possible epidemics of harmful forest organisms, via these unhealthy trees, is prevented. In the meantime, due to periodic fires, dead cover, or fallen and dead trees are removed, thus preventing bigger fires.

In the eastern Mediterranean, brutia pine, yellow pine, black pine, aleppo pine, and stone pine can are widely distributed. Among these, brutia pine is spread across a wide area, especially in most fire sensitive regions. It is created with a thicker bark around the trunk compared to other pines. This species can be minimally impacted from low and medium level cover fires. On the other hand, seeds in the cones of brutia pine are thrown far away by the heat of the fire, reaching fertile germinating grounds, thus helping to spread the forest.

References

• Fuller, M. 1991. Forest Fires: An Introduction to Wildland Fire Behavior, Management, Firefighting, and Prevention, SD421.F84, Wiley & Sons, Inc., NY, pp. 238.
• Keeley, J. E. 2007. “Chaparral and Fire,” Fremontia, Volume 35:4, pp. 16-21.
• Bond, W. J., Wilgen, B.W. 1996. Fire and Plants, SE18HN, UK, Chapman & Hall, UK, pp. 259.

What possible similarities could there exist between a human and a tree? Interestingly, the open wounds of human beings and trees are subject to the same laws and are healed in similar ways.

Have you ever wondered what kinds of similarities exist between human skin and the bark of a tree?

Trees are subject to major and minor injuries just like humans are. These injuries could be the result of a broken branch, insect infestation, animal damage, fire and human related damages. These kinds of injuries can lead to the infection of a plant which can cause rotting and damage to the transport tissues like phloem (nutrients) and xylem (water) by microorganisms and insects (bacteria, fungi, parasites).

Fluid excretion in wounds and development of scar tissue

Blood serum is secreted in human wounds, whereas gum and resin type fluids are secreted in various trees (Figure 2 and 3). Serum plays an important role in sterilization of the wound, along with blood coagulation. Defense mechanisms in trees involve excretion of different fluids (resin in needle-leaf trees, gum in broadleaf trees) that are synthesized via composition of various chemicals. The most important feature of these fluids is that with their special chemical make up, they can protect the wound from organisms like bacteria, fungi, and insects that are potentially harmful to the tree. These fluids also feature coagulation like the human serum; they congeal and solidify after excretion and trigger a biological healing process while physically covering the wounded area.

Wounds are repaired with new connective tissue cells (fibroblasts) in humans and by callus in trees. Healing of the wound following the coagulation takes place with proliferation of cells in this region (epithelialization). First, epithelial cells wrap the wound via proliferation. New transport tissue is developed during this process. Next, fibroblasts that are in charge of wound repair are transferred into coagulate via this transport tissue. Fibroblasts synthesize collagen protein of the required fiber structure needed for the wound repair. Injured area is woven with these, and recovers its former shape in time depending on the size of the wound.

Healing is granted through timely reproduction, transformation and maturation of paranchimatic cells that make up the callus, when only a portion of tree bark is damaged. Paranchimatic cells are fused side by side and they form a thick elevation of callus tissue around the wound (Figure 4). At the end, these are activated for the development of a new, healthy cambium and bark. Cambium tissue is responsible for vertical and lateral growth of a tree therefore it is vitally important that it does not suffer any damage. This tissue in growth season proceeds from the perimeter of the wound towards the center for a complete healing. The productive efficiency of the tree medium can speed up or slow down the curing process similar to humans.

The reality is that all living things are created with a dress suited for their environments so that their bodies can be protected from negative elements from the outside world. Organisms are armored from many harmful physical (mechanical, extreme temperatures, light etc.) and chemical effects with this perfectly bestowed dress as a manifestation of the divine compassion in the universe just as in the case of the wounds of humans, animals and plants which are subject to the similar laws found in nature.

Southern Pine Beetles (Dendroctonus frontalis, figure 1) are one of the most harmful pests in the world, causing hundreds of million dollars worth of damage to pine trees in the Southern United States. These beetles initiate their attack on a pine tree by having a small group of female beetles dig into the inner park (Figure 2) and phloem of the pine tree. Once this work is done these females will secrete a chemical that will draw other male and female beetles to the affected pine tree. This initial attack is followed by a massive attack by a larger number of beetles, enabling them to easily overcome the defenses of the pine trees due to the sheer number of beetles. Shortly after taking over the tree, mating begins between the male and female beetles. As part of the mating process the females fill the excavated galleries within the trees with eggs. After the eggs have been laid the adult beetles will then leave the tree and continue to attack other trees. Attacking trees and causing their death is of course a sad story and may not sound very interesting since most pests have similar attack strategies; however, one detail that we did not mention yet makes this process more intriguing. What do the larvae eat to complete their development within a gallery that is inside a dead tree? The answer is: Fungi.

Pine beetles establish a symbiotic life structure with a beneficial fungus (Entomocorticium sp. A), which is the main food source for their larvae. Adult pine beetles have a body compartment (mycangium), in which they can carry this fungus. When adult beetles dig galleries in tree barks, they inoculate these galleries with the fungi. This fungus will grow in these galleries that helps the beetles’ larvae complete their development by providing them with a source of nutrition. Fungi also benefit from this process by being transferred from one tree to another with the help of the beetles. This symbiotic life structure is threatened by the existence of an antagonistic fungus, (Ophiostoma minus, also known as blue stain fungus) and parasitic mites both of which the southern pine beetles also bring along. The blue stain fungus has no nutritional importance for larvae, this fungus can grow in the same galleries as the beneficial fungus and they can even outcompete them. In addition, the parasitic mites feed on the blue fungi and can prove harmful beetles as the amount of blue fungi increases. Therefore, beetles’ larvae cannot survive for long and thus the reproduction of the southern pine beetles can be disrupted without some form of defense.

A recent study by Scott et al. has shed some light on this complicated life structure [3]. These tiny beetles, which are only a few millimeters long, have a smart defense mechanism to prevent their larvae (Figure 3, pink arrow). As far as the history tells us, humankind started using pesticides about 5000 years ago, but these tiny beetles have been using them for preventing the growth of the blue-stain fungi long before humans started using pesticides. These studies showed that the symbiotic coexistence of southern pine beetles and the beneficial fungi (Figure 3, yellow circle) is maintained by a (actinomycetous) bacterium (Figure 3, inside the red square). This bacterium produces a previously unknown antibiotic compound (named mycangimycin), which selectively inhibits the growth of blue-stain fungus hence providing a significant advantage for the maintenance of the beneficial fungi (that is, the main food source of the larvae). How can this bacterium even be present in the freshly carved galleries in pine trees in the first place? The surprising answer to this question is that they are transferred to these galleries by the very same pine beetles. As mentioned earlier, adult pine beetles carry beneficial fungi in their body compartment (mycangium) and inoculate the galleries they carved with this fungus to provide food for their larvae. In addition to this beneficial fungi these beetles carry they also carry bacteria that can produce antibiotic compound to inhibit the growth of blue-stain fungi and consequently diminish the number of parasitic mites. This bacterium can grow inside these galleries and even in a body compartment of adult southern pine beetles. Interestingly, this antibiotic kills blue-stain fungi but does not significantly affect the growth of the fungi, which is the food source for larvae. Thus, the beneficial fungi can multiply in number and offer enough food for the development of beetle larvae. Some of these larvae manage to grow to adults and then leave to attack other pine trees carrying the same fungi and bacteria with them (Figure 4).

The interactions within the rest of the life kingdoms is not any less complicated than the symbiosis between pine beetles, fungi, and the bacteria. The interactions between animals, plants and microbes are very complex and also fragile. Removing or replacing any member of an ecosystem can often result in a serious failure in the ecosystem as was observed many times especially within the last century.

References

1. http://www.nsf.gov/news/news_summ.jsp?org=NSF&cntn_id=112319&preview=false.
2. http://entnem.ufl.edu/creatures/trees/southern_pine_beetle.htm.
3. Scott, J.J., et al., “Bacterial protection of beetle-fungus mutualism.” Science, 2008. 322 (5898): p. 63.

we wait. The sun steady

in its track. Vicissitudes

of light, shadows thinning,

growing long. We endure

and wait. Salvation in

the hour before the hour

before dusk. The seedlings

come twirling down,

skittering along the street.

The shadows quiver like

benevolent ghosts. The trees

cackle their sussurant laugh.

And we, impatient, sentient

beings, wish time to be inert.

In order to answer these questions, let’s first take a closer look at the nature of leaves and how they function. Simply put, leaves are nature’s food factories. During spring and summer the leaves serve as factories where most of the food necessary for tree growth is manufactured. The process of transforming water and carbon dioxide into sugar is called photosynthesis, which means literally “putting together with light” (Figure 1). This food-making process is performed by the chlorophyll molecules that are present in the leaf cells. Chlorophyll absorbs energy from sunlight. While the water is sucked in from the soil by the roots and carbon dioxide is inhaled through the pores of the leaves, chlorophyll synthesizes carbohydrates, such as sugars and starch. During winter, when this process cannot continue due to lack of light or water, the trees rest and live off the food they stored during the summer.

What is most astonishing is that it is again chlorophyll that gives the leaves their green color. Along with the chlorophylls (green pigment), spectrums of pigments, such as carotenoid, anthocyanin, and xanthophyll, give different colors to the leaves (Figure 2). When chlorophyll is abundant in the leaf cells, as it is during the growing season, the green color of chlorophyll dominates and masks the colors of any other coloring pigments that may be present in the leaf. Thus, the leaves of summer are characteristically green. When for some reason the number of chlorophylls decreases significantly, the color of other pigments paint the leaves, such as in the fall. For example, maple and acer leaves turn to bright red because of the carotenoid and anthocyanin pigments while sugar maple leaves turn yellow due to xanthophyll pigments.

Time to change colors

At the end of summer and the beginning of autumn, the length of days and the average temperature begin to decrease. Then the trees “know” that it is time to get ready for winter, their sleep-time, and the leaves stop making food. Since there is no longer a need for them, the chlorophyll molecules break down, and so the green color begins to fade. As we, the grieving viewers of this process, say farewell to the color of life, we are surprised by the splendor demonstrated by vibrant colors ranging from yellow to orange.

All these colors are due to the mixing of varying amounts of the chlorophyll residue and other pigments in the leaf becoming visible during the fall season. For the realization of this beauty, mixtures of pigments give rise to the reddish and purplish fall colors of trees such as dogwoods and sumacs, while others offer the sugar maple its brilliant orange or yellow. In some trees, like the maple, a red pigment will be formed in the fall if the days are warm and the nights cold. These trees produce sugar in the leaves during the day, but this sugar cannot move out when the nights are cold, and the leaf’s connections to the tree begin to break down. After that the high sugar concentration favors the formation of a class of pigments called anthocyanin, which is red. Thus, the leaves left out in the sunlight turn red through this process. The brown color of trees (like oaks) that appears after chlorophyll breaks down comes from plant wastes left in the leaves. The autumn foliage of some trees is only yellow, so it is the combination of all these things that makes the beautiful colors we enjoy in the fall.

Thanks to scientific research, today we know the details of leaf color change. The approximate size of these pigments is so small that hundreds of millions of them, put edge to edge, could measure only 1 meter. Isn’t it amazing how the beauty of autumn is exhibited through the hands of such small and blind painters?

Abdullah Akpinar is a graduate student in Planning and Landscape Architecture at Clemson University, Southern Carolina.

“You know, I wasn’t always like this,” began the butterfly. “I used to creep on the ground instead of flying in the air. I used to have gloomy colors and obnoxiously long hair instead of these lovely colors and elegant wings.”

It was really hard for me to believe that the butterfly had ever been in the situation she was describing. I am sure the other fellows in our group were also surprised to hear this, but none of us wanted to interrupt the flow of her beautiful words.

“My situation back then troubled me, indeed. Why was I doomed to get smashed under the feet of others? Why was beauty innate to other creatures while ugliness was my fate? Dissatisfied with my situation, I wanted to change, dreamed to wake up into a new day, desired to breathe a fresh life. My creeping ugly body did not match my spirit within.”

At this point, I couldn’t hold my breath anymore, and asked: “So, what did you do about it? Was it then that you turned into this beautiful state?” The butterfly reacted most unexpectedly to my question. She neither smiled nor gave a humble answer. Without even changing the expression on her face, as if she hadn’t heard me, she continued: “I couldn’t do anything about it.” Then she stopped. You know how long intermissions like this can feel. After a few seconds the butterfly took the word again seriously, as if she had a duty to tell her story, rather than an urge to praise herself.

“In that desperation, I decided to bring all this to an end. I slowly climbed a high tree. From that height, the scene looked very different. I was able to observe things just like the birds. I had found a security that I could never find on the ground. A perfect day to initiate my change. If I wanted to be revived anew, I needed to die first.”

We weren’t expecting to hear such sentences from this unique guest in our forest. Why was she telling us all this anyway? We were all young trees looking forward to our bright futures. The gloom in her words veiled her beauty, and eclipsed our interest in listening to her. But observing the change in our facial expressions, the butterfly continued:

“And slowly, I started tying the rope that I carefully made myself, and rendered myself to the hands of the wind. And just like I had predicted, things started changing very quickly as I descended towards the ground. I realized something that I had never thought before: I belonged to someone who did not want me to perish like this. It was as if time suddenly stopped, and I had a chance to communicate with my Owner. I was ashamed of what I had done, and asked for a second chance, which was given to me. Then I came to find myself hanging from the tree.”

I was thinking that the butterfly was going to conclude with “hanging from the tree in this vibrant beauty.” Astonishingly, there was more to the story of how she gained this beauty. My interest started to build up again, and I observed the same curiosity on my friends’ faces.

“In my anguish and shame, I started covering my body. I wove a small tent around myself. As such, I was alone in my darkness, away from the insults, from the harassments, and from myself. During my retreat, I tried to re-evaluate things and thought about positive ways to change. After a while, I decided to rid myself of my cocoon and do something. But there was one hurdle: I was hanging down in the middle of the air, covered with a genuinely woven house. I had to undo the excellent job I had done, but it wasn’t easy to tear my silken prison apart.

“As small pieces of the house were torn and as I was able to glimpse the daylight, I tried even harder to free myself. When the hole I made was large enough, I squeezed myself through. It was then that I saw my new self, reflected in the puddle below me and gave the most heartfelt praise to my Owner.”

Thus concluded the butterfly’s story of change. She even gave us admonitions about positive ways of making changes in our lives and in ourselves. She also talked about how potent our bodies are in facilitating the process of change.

All this was wholeheartedly embraced in our forest by the young trees, including me at the time. Why? Because we were in the same place where we were born; so we wanted to do something about it. We were all inspired by the butterfly’s story and decided to mobilize ourselves. Even the peaceful nights that used to be filled with the rhythmic voices of crickets were now filled with the whispers of our discussions on how to enact this fundamental change.

No wonder the old trees found this activity among the young outrageous and inappropriate. They thought that we were trying to achieve something against our nature. The time spent on these efforts was regarded as a waste. The old trees first tried to warn us against our “hallucinations,” but it turned out to be a fruitless effort. Then the old trees threatened to block our sunlight by covering us from above. This, too, became a wasted effort when the old trees realized they were engaging in sanctions that would kill their young ones instead of changing their minds. In the mean time, our ideas caught the attention of the newer generations. Upon hearing the whole story regarding the butterfly and our efforts to change, they too joined us in that desire to mobilize. So eventually the old trees decided to wait and see what would happen. After all, we were simply trying to imitate the butterfly.

Ever since that spring when the butterfly shared her story, we all covered ourselves with as many leaves as possible, similar to the cocoon of the butterfly. We were hoping that when the winter winds blew those leaves away, our mobilized selves would come out, just like the flight of the butterfly. We persistently covered ourselves this way year after year, but neither our roots became feet, nor did our branches transform to wings. Eventually, we realized that we were only getting older and that we were wasting our time. No one was out there anymore to advise us, either, because the butterfly had died that same spring, and the older trees shunned us because of our stubborn foolishness.

Once young trees, now experienced and mature, we decided to talk about the failed plan that was supposed to lead us to change. This time, instead of reciting the misleading story of the butterfly, we were going to talk about why this had happened to us and how we should advise our young. We started by analyzing the cautions of the old trees. Although we were not fully able to understand the wisdom behind the words of the elders, we could feel that they carried some implicit good in them.

As our voices undulated in the air, one of the migrating birds heard this talk and made a swift landing near our place of discussion. She quickly started to talk: “You know, we also had a problem among our young, but it was in the opposite direction. They wanted to quit traveling and stay in one place. We even lost some of them last winter when they decided not to migrate.” The unexpected interruption by the bird evoked other questions in our branchy minds. Why was this problem always occurring with the young? And why did they fancy a nature opposite to their own?

We couldn’t come to a conclusion. But one day, a short time after the discussion with the bird, we witnessed a mobile tree and a stationary bird. The tree was being carried behind a huge animal that was making a horrible, obnoxious noise. This was an animal we had never seen. To our surprise, the two Men who were riding the animal had captured a bird and somehow made her into a stationary bird that could constantly stand on the walls surrounding their home. Neither the mobile tree nor the stationary bird induced joy in the forest.

The mobilization of the trees and the stationing of the birds continued until one day when there were hardly any trees and birds left. Something was terribly wrong because none of this brought any good to our forest. The few remaining trees wanted to stay where they were born, and the few remaining birds wanted to fly.

On a once breezy and warm, but now unusually hot spring day, a butterfly appeared in the place where our forest used to be. She carried a poetry book she had composed. As the butterfly voiced her yearning for the glorious trees in the land and the soaring birds in the skies, tears of regret filled our eyes. And her verses of nostalgia ended with a prayer:

Oh the Unchanging One despite the transients,
Oh the Eternal One in the face of all mortals,
Oh the Creator of all animals that are now only in the tales,
Resurrect nature, we implore with our silence.

Seth Mette has a PhD in Aerospace Engineering and is currently working as a postdoctoral fellow at West Virginia University. He has a special interest in psychological fiction.

Let me give you some everyday examples. For instance, most customer complaints (eighty percent) stem from a very few reasons (twenty percent). Eighty percent of problems in a company are caused by twenty percent of the employees. This idea is often applied to data such as sales figures: twenty percent of clients are responsible for eighty percent of sales volume. Eighty percent of our expenditure, stems from twenty percent of the items we buy. If we can differentiate cheap items from expensive items, then, we can develop ways to save on our shopping. We need to realize that we make eighty percent of our phone calls to the same twenty percent of our acquaintances. If we look at the clothes we wear, we realize that eighty percent of the time we wear the same twenty percent of them. We can also use this principle to plan our daily schedule and to order things according to their importance. For example, we may calculate the length of the time to do something and determine the importance of the thing we are to do. We calculate the percentages according to all the things waiting to be done. Later, with twenty percent of our time, we put our attention and energy into the things which carry eighty percent of the importance. We leave the things with twenty percent importance to later because those things require eighty percent of our time. What needs to be observed here is that quality is preferred over quantity. Some of us postpone tasks which can be done in a short time, due to the belief that we can somehow do it later. According to the Pareto Principle, it is not a good idea to delay things which are important in terms of quality even if they take a bit of our time to carry out.

Bediüzzaman used this rule very intelligently in his works in terms ofat explaining the wisdom behind seeming realities. manay-Ii harfi. For example, in the answer to the second question under the Twelfth Letter, Bediüzzaman uses the Pareto Principle persuasively as an answer to the following question: “As sending Prophets has caused many or even most people to become unbelievers because of Satan’s seduction, how can you say that creating evil things and acts is good, that raising Prophets is a mercy for humanity?”

In this answer, Bediüzzaman emphasizes the importance of quality over quantity. According to him, quantity has no importance in relation to quality. Moreover, Bediüzzaman shows that it is not an evil to lose atheists and hypocrites, who are many but less important in terms of quality, when you compare them with prophets, saints, and the righteous who are few, in terms of quantity. It is interesting that he uses a twenty percent to eighty percent ratio in each of his two examples:

“As quality is always far more important than quantity, we should consider only qualitative values in making our judgment. To cite an example: 100 date-stones are worth only 100 cents until they are planted and grow into palm trees. But if only 20 grow into trees and the remaining 80 rot because of over-watering, how can you say it is an evil to plant and water them? Everyone would agree that it is wholly good to have 20 trees at the expense of 80 date-stones, since 20 trees will give 20,000 date-stones.

Again, 100 peacock eggs are worth maybe 500 cents. But if she sits on the eggs and only 20 hatch, who can say it is an evil that 80 eggs were spoiled in return for 20 peacocks? On the contrary, it is wholly good to have 20 peacocks at the expense of 80 eggs, because the 20 peacocks will be worth far more than the eggs and will lay more eggs.”

In another example, Bediüzzaman explains why he remained distant from politics in the Thirteenth Letter as a response to the third question:

“…We are travelers in this world. Basing myself on the Qur’an’s light, I say that humanity has reached a marsh in this century. Whole caravans of humanity are trying, with great difficulty, to advance in this putrid marsh. A small minority follow a safe way and some have extricated themselves, but the majority continues to flail around in the dark. Although 20 percent of this majority seems quite happy with this struggle, mistaking its dirt and filth for musk and ambergris, whereas the other 80 percent knows that it is in a filthy marsh but cannot see the safe path (leading them out). We must bring that majority out of the marsh. To do so, we must use a mace to knock the 20 percent back to its senses or provide the 80 percent with a light to see a way to safety. I see that most people hold maces, but almost no one gives light to the helpless 80 percent. If some still have light, they are not trusted because they also carry maces. People are afraid of being beaten after being drawn to the light. Besides, the light may be extinguished

if the mace is broken.”

In this example, Bediüzzaman states that the first thing that needs to be done for those who have deviated from the right path is to show them the Qur’anic truths instead of helping them through politics which is associated with hitting someone on the head. Again it is interesting to see that Bediüzzaman used the Pareto Principle to explain the example. Bediüzzaman considers human beings to be walking in a dark swamp. Moreover, he believes that the priority is to enlighten most of the people’s road (eighty percent) with a small (twenty percent) effort, rather than to help a small number of people (twenty percent) with a large amount of political power (eighty percent of effort).

In the Twenty-Eighth Letter’s seventh matter, Bediüzzaman emphasizes that twenty percent of scholars surpasses the other eighty percent in terms of quality while he is examining how strong truths seem weak in the hands of weak people: “Eighty percent of mankind are not investigative scholars who can penetrate to reality, recognize reality as reality and accept it as such. They rather accept matters by way of imitation, which they hear from acceptable and reliable people, in consequence of their good opinions of them.”

Therefore, it is possible to say that Bediüzzaman, an investigative observer, found the Pareto Principle without using any contemporary methods such as surveys. Besides being known as an eminent Islamic Scholar and Saint of Islam admired by most of the people, Bediüzzaman use of mathematics, physics, astronomy, and sociology in the Risale-i Nur show us how to contemplate the universe using modern science.

Persuasion through Probability in the Risale-i Nur

Bediüzzaman often uses mathematical logic and probability in his works which were written to save the faith from evil (thought). For instance, under the section on the stratagems of Satan in the Twenty-Ninth Letter, Bediüzzaman states how harmful it can be if you use the feeling of fear against its purpose of creation. He gives an example of how he persuaded a person, who had to fear of drowning, to embark on a boat willingly without any fear through giving an excellent example of probability:

An important man (may God’s mercy be upon him) was afraid to travel by boat. One evening, we went to Galata bridge to take the ferry to Eyup.

He did not want to get on, saying that he feared he would drown. When I asked him how many boats were in the Golden Horn, he replied that there might be as many as one thousand. When I asked him how many boats sank each year, he replied usually one or two, and sometimes none.

I made this analogy: “Since a year has 365 days, your chance of drowning is 1:365,000. Why does such a small chance scare you?” I asked: “How much longer do you expect to live?” He answered: “Maybe 10 years; I am old already.” I contunied: “As there are 3,650 days in 10 years, your chance of dying today is 1:3,650. But since we do not know when we will die, you could die at any time. So repent and weep! Write your last will and testament!”

Seeing the truth in my words, he got on the boat even though trembling. On the boat, I told him: “God Almighty placed fear in our nature so that we might preserve our life, not ruin it. He did not give us fear to make life an unbearable burden full of pain and torment. If there is a risk of 1:2 or 1:3 or 1:4, or at most 1:5 or 6, it may be permissible and tolerable to fear and avoid the risk. But to fear a chance of 1:20, 1:30, or 1:40 is groundless suspicion, a sort of paranoia that changes life into a torment.”