Population biologists

The vitamin and metabolic derivatives of a fat-soluble substance calciferol. These antirachitic vitamins are produced from A -unsaturated sterols upon irradiation with ultraviolet light. Population biologists have adduced strong evidence for the hypothesis that lighter skin color, the primary characteristic of race, is related to the lower solar radiance in northern climes. Vitamin D plays a central role in calcium metabolism, both in terms of... 

The streptavidin capture method is also of advantage to population biologists, because it provides for rapid, repeatable, and reliable sequences... 

Of course such exponential growth cannot go on forever. To model the effects of overcrowding and limited resources, population biologists and demographers often assume that the per capita growth rate N/N... 

Writing in The Dial, A Fortnightly Journal of Literary Criticism, Discussion and Information, Raymond Pearl, the population biologist, opened his 1913 review with reference to a metaphysical diversion of my academic and intellectually irresponsible youth, in which orthodox Darwinism was turned on its head. Is there not quite as much justification, so far as the objective facts of nature are concerned, for one to say that the environment is adapted to the organism as there is for him to make the converse propositions (Pearl 1913, p. 111). Could natural selection, or any other mechanistic hypothesis, stand up to the task It would utterly fail. Pearl argued. Before Henderson s Fitness, no systematic efforts had been made to examine the fitness of the elements of the environment for sustaining life. 

Getz, L. L., and Carter, C. S., 1980, Social organization in Microtus ochrogaster populations. Biologist, 62 56. 

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