Species perishable

The heartwood of various timber species shows a wide range of resistance to biological attack. The natural durability of heartwood) is assessed by ground contact tests and according to survival, classified into five ctegories - very durable (>25 years), durable (15-25 years) moderately durable (10-15 years) non-durable (5-10 years) and perishable, (<5 years). 

The destiny of stellar species invites the following question what mutation transforms an otherwise peaceful and long-lasting celestial body into an explosive and creative supernova In fact it is the star s luminosity and the ruinous energy expenditure of its glorious years that bring about its own downfall. Indeed, to shine it must burn, and to bum it must perish. In a straggle to draw out their final lustre, massive stars push their fires to the very limit and exhaust themselves in an attempt to preserve their former brilliance. 

In addition to the damage acid rain causes to structures, acid rain also affects natural environments. Significant loss of spruce forests due to the burning of spruce needles by acid rain has occurred in Scandinavia. Acid rain also extracts a heavy toll on aquatic systems and associated organisms. Most adult fish cannot tolerate pHs much lower than 5.0, and even the most tolerant species will not survive below a pH of 4.0. Fish larvae are even more susceptible to low pH levels. Insects and their larvae also perish when pH approaches 4.0 in aquatic systems. Numerous lakes in upstate New... 

Metal tolerance can be defined as the ability of a plant to survive on soils that are toxic or inimical to most other plants because the soils contain elevated levels of one or more metals. This definition of tolerance requires us to be able to show (a) that the soil is toxic and (b) that a particular genotype or species can grow better on this soil than others. The toxicity of the soil can be inferred from the reduction in species diversity, or from direct tests in which plants are grown on the soil and their survivorship assessed however the causes of the toxicity (metals or other possible causes) cannot so easily be determined. Again, tolerance of the soil may be suggested by the survivorship of plants on the soils in which other plants perish (Bradshaw, 1952 Watkins and Macnair, 1991) whether this is tolerance of the metals present in the soils or other factors cannot be assumed without more detailed experiments. 

It is worthwhile to momentarily consider this subject in relation to the philosophical history of western ideas and culture. Long before atoms were known the Greeks developed philosophical ideas that remain part of our everyday thinking, even ifnotjustiflable. Aristode and Plato argued thatalthough individuals within a species die and perish, the ideal form for their species is fixed and eternal. Differences among... 

ARCANUM SPECIFICUM — is an extract of the interior nature, related so intimately to the substance of any species that the same may be known therein. It must be educed with care lest the gross substance perish. For this reason is it called specific. And it differs from quintessence, which, by reason of its extreme subtlety and excellence, seems almost to have deserted its species, and gone over to the class of ethereal things. But the Specific Arcanum exhibits the substance, shape, and specific difference of composites as an extract more akin to the interior body. The Specific Arcanum is duplex. One is of the essential and substantial form, and is called Astral, the other is Material. 

The dried cells and spores float in the air as dust and so accomplish a dispersal of the organism. Doubtless most of them never again meet suitable environment and so sooner or later perish. But some will fall into favorable conditions and be able to multiply enormously again, and so the species is continued. 

Benthic invertebrates can take up hydrocarbons by feeding on contaminated material, breathing in contaminated water, and through direct absorption from sediments or water. Most invertebrates depurate hydrocarbons when the water and sediment return to a clean state or if placed in a clean environment. In severe oiling, however, depuration can take months. Sessile (or immobile) species are obviously at a disadvantage and may perish from prolonged exposure to contaminated sediments. Generally, however, all benthic species are affected by a short-term dose of the hydrocarbons in oil. 

Here, near the bottom of the world, the fashion mogul saw a microcosm for all of humanity s environmental ills—and a laboratory for finding ways to fix them. The big threats were all here destruction of forests and habitats, dying rivers and ocean coasts, topsoil erosion, brutal extraction of resources and energy without regard for life or landscape. There were displaced populations, lost cultures, and mass extinctions already under way—not just of rare animals but of critical species that pollinate crops, control pests, and clean the air—a rate of dying out that hasn t been seen in 65 million years, when the once-dominant dinosaurs perished. Underlying it all, there was the... 

Deforestation for urban development has resulted in the extinction or relocation of several species of plants and animals. Animals are forced to leave their forest homes or perish amongst the destruction. The number of plant and animal species that have become extinct due to deforestation is unknown. Scientists have only identified a fraction of the species on Earth. It is known that if the destruction of natural resources continues, there may be no plants or animals successfully reproducing in the wild. 

So also every vegetable of the earth must give nutriment to the three things of which they consist. If they fail to do that the prima condita perish and die in their three species. These nutriments are earth and Rain, that is the Liquor, each... 

Cotton culture has evolved from gathering of the lint and seed from wild plants by indigenous people to the domestication and cultivation of selected species. Cotton is both a fiber (lint) and food (cottonseed) crop. For each 45.36 kg (100 lb) of fiber produced, the plant also produces 68.04 kg (150 lb) of cottonseed. Cotton, which only has value once the fiber and seed are separated at the gin, is perishable and must be harvested in a timely manner or the fiber and seed can deteriorate in quality and value. 

His argument fell on deaf ears. When he left his office of 37 years, a single box of papers in his arms, he took with him, in ajar, the last remaining Adiuvo mushroom known to man. Its ancestors had once been near ground zero when the asteroid that collided with Earth wiped out the dinosaurs, but these mushrooms somehow didn t perish. Simon thought this last little mushroom of their species could teach us how to survive some future calamity. 

The fruit of a small tree (of the family Annonaceae) that is native to the American tropics. The yellowish-greenheartshaped fruit are 3 to 4 in. (8 to 10 cm) in diameter, white, and have a sweet granular custardlike pulp. They are used as a dessert fruit, and are closely related to the other Annona species of fruit (the most common ones are the cherimoya, custard apple, and soursop). Their flavor is best when fully ripe, a stage at which the fruit is very perishable. 

The fragments that form have an unpaired electron, for example, H% Cl% CHj-, and CH3CH2". When these species are composed of more than one atom, they are called radicals. Because of the unpaired electron, radicals and free atoms are very reactive and usually cannot be isolated. However, radicals and free atoms are present in low concentration as unobserved intermediates in many reactions, such as the production of polymers (Chapter 12) and the oxidation of fats that leads to the spoilage of perishable foods (Chapter 22). 

Science tells us that species, too, die. It can be argued, for instance, that Paleolithic hunters were responsible for the collapse of the great New World mammals, the giant sloth and the mastodon, but it is more persuasively argued that over the course of millions of years of species life they perished because the climate changed they had become specialized to cope with an environment that did not survive. 

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