By Erwin Bunning, Hermut Wilhelm Pfeffer
This biography examines the existence and paintings of Wilhelm Pfeffer (1845-1920), a pioneer of contemporary experimental biology who expected a lot during this box that's now taken without any consideration. The e-book indicates Pfeffer as a instructor and author with huge learn pursuits, incisive experimental abilities, and a questing brain. Dr H.Wilhelm Pfeffer, grandson of Wilhelm Pfeffer, presents the interpretation for this English variation.
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Additional info for Ahead of His Time: Wilhelm Pfeffer, Early Advances in Plant Biology
Pfeffer continued his education as apothecary by studying one semester at the University of Marburg, and then by practicing as an apothecary's assistant, first in Augsburg and later in Chur. Pfeffer studied again in Marburg from 1868 to 1869, and there he passed the state examination in pharmacy. b) Botanist What was it that led Pfeffer to botany? The foundation was the influence of the environment of the pharmacy 17 Ahead of His Time: Wilhelm Pfeffer where his father had built up large collections of drugs, plants, shells and fossils.
Pfeffer made exact measurements of the changes in length and thickness of the staminal filaments, and he recognized that a change in volume was involved. Therefore, the changes in the thickness of the stamen did not result from a contraction. In addition, he noted that a reduction in volume coincided with an 28 Mimosa, Staminal Filaments... outflow of water (to the extent that water was injected into the intercellular spaces which normally contain air). Pfeffer concluded that the movements were due to osmotic forces.
At first the expression had a different meaning, and W. Hofmeister (1867) gives the earlier meaning as follows: Every plasma mass is bounded on the outer surface by a thin layer which in certain cases has a measurable diameter. This layer is distinguished from the inner 33 Ahead of His Time: Wilhelm Pfeffer mass in that it does not consist of the same large, solid and granular matter; furthermore, it is more translucent, shows a higher refraction for light, and has a greater density and firmness.
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