New PDF release: Ahead of His Time: Wilhelm Pfeffer, Early Advances in Plant

By Erwin Bunning, Hermut Wilhelm Pfeffer

ISBN-10: 0886291038

ISBN-13: 9780886291037

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 without any consideration. The publication indicates Pfeffer as a instructor and author with vast learn 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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Additional resources for Ahead of His Time: Wilhelm Pfeffer, Early Advances in Plant Biology

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When he used the term "molecular forces/' Pfeffer was evidently thinking of forces of absorption. In spite of Pfeffer's suggestions for further research into membrane permeability and in spite of his specific warnings, two other theories took hold. They were the ultra-filter theory and the rivalling lipid theory. The former held that the size of the molecules determines the ability of a substance to permeate, while the second theory held that the solubility of the substance in oils was the deciding factor.

20 Pfeffer's experimental results became the foundation stone of van't Hoffs Theory of Solutions. In his acceptance speech for the Nobel Prize, van't Hoff specifically acknowledged the pioneering accomplishment of Pfeffer. The significance of Pfeffer's findings in the fields of biology and medicine is well known to college students in these subjects. The existence of a plasma membrane is also something every student knows about. 21 b) The Plasma Membrane The expression Plasmahaut or Plasmamembran [plasma membrane] did not originate with Pfeffer.

For several reasons this question is very important" (1877a). As evidence for his idea, he pointed to the finding that the nuclei of cells and chlorophyll grains (that is chloroplasts) which had been isolated and put into sugar solutions showed changes in volume, depending on the concentration of the solution. " Pfeffer's pre-eminence as a scientist is evident when one sees that it took many decades before researchers in membrane biology understood the significance of his experimental and intellectual analysis of the processes of the absorption of substances.

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

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