Download e-book for kindle: Ahead of His Time: Wilhelm Pfeffer, Early Advances in Plant by Erwin Bunning, Hermut Wilhelm Pfeffer

By Erwin Bunning, Hermut Wilhelm Pfeffer

ISBN-10: 0886291038

ISBN-13: 9780886291037

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 ebook exhibits Pfeffer as a instructor and author with broad examine 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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Walter (cf. 5). Fig. 7 (See previous page) Osmometer (after Pfeffer's original drawing). Major components: The porous pot (z) which is about 46 mm high and the manometer (m). In his early experiments, Pfeffer worked with membranes that had been precipitated within the wall of the pot. This was achieved by filling the porous pot with a potassium ferrocyanide solution, and then immersing the pot into a solution of copper sulphate. The two compounds diffuse towards each other and react to form copper ferrocyanide as a precipitation membrane within the wall of the porous pot.

Fig. 8 Drawing by Pfeffer (here slightly enlarged) of a fully developed plant cell. (Except for the definition of the membranes, the drawing does not vary from that of other researchers). " (Equivalent terms used today: (z)= cell-wall, (p1)=plasmalemma, (p2)= tonoplast. Enlargement about 500 times). 34 Mimosa, Staminal Filaments... Pfeffer did not only postulate the existence of a plasma membrane, but he also tried to prove his theory through experiments. The one objection he continued to run into was that these were pathological phenomena related to the dying of the cell.

With this goal in mind, it is of great significance that even unicellular organisms have capabilities and functions which are developed in a specific way, and which show very different characteristics (1897). This explains why Pfeffer started early to include singlecelled organisms in his research. Subsequent developments in biology fully bore him out, although it took decades for the acknowledgement of this to come about. As an example, long before the advent of the modern genetics of bacteria, Pfeffer made the following statement in the chapter "Variations and Heredity" of his Pflanzenphysiologie: Our knowledge about the origin and the cause of variations will no doubt be increased with our present experience in physiology, and especially by making use of lower organisms with a short life-span.

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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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