Download Ahead of His Time: Wilhelm Pfeffer, Early Advances in Plant by Erwin Bunning, Hermut Wilhelm Pfeffer PDF

By Erwin Bunning, Hermut Wilhelm Pfeffer

This biography examines the lifestyles and paintings of Wilhelm Pfeffer (1845-1920), a pioneer of recent experimental biology who expected a lot during this box that's now taken with no consideration. The booklet indicates Pfeffer as a instructor and author with extensive study pursuits, incisive experimental talents, and a questing brain. Dr H.Wilhelm Pfeffer, grandson of Wilhelm Pfeffer, offers the interpretation for this English variation.

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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.

27 In 1895, he reported that the ability of certain substances to permeate through a membrane was clearly related to their solubility in lipids. Overton concluded that lipids were present in the plasma membrane, and later research proved that this was so. Like Pfeffer, Overton did not believe that the plasma membrane was simply a Oelhaut [skin of oil] or lipid film. In its original form, the lipid theory of permeability as it related to the penetration of substances into the cell was too one-sided.

5). Is this an "artificial cell"? Of course not, if we think of it as a model of a living cell. Sachs18 strongly rejected the idea of any such comparison. It remained for Pfeffer to uphold the comparison of the Traube cell with the living cell as it relates to a small and yet significant point — the semipermeable membrane of the Traube cell is comparable to the membrane of the living cell to the extent that it allows water to pass inward easily, while practically all the solute in the cell is retained.

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