By Erwin Bunning, Hermut Wilhelm Pfeffer
This biography examines the lifestyles 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 publication 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, presents the interpretation for this English variation.
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Extra resources for Ahead of His Time: Wilhelm Pfeffer, Early Advances in Plant Biology
He also noted the adenoidal (glandular) activity of the protoplasm, a feature previously postulated by Overton. 27 Decisive progress was not made until the advent of modern membrane biology. The discovery of enzymes and the discovery of carrier molecules within the membrane are two examples. This confirmed what Pfeffer already had suggested as a possibility. 88). The ground lost after Pfeffer was so extensive that scientists in recent times were left with ideas such as those expressed in 1973 by D.
Kniep found that the bacterium made a qualitative distinction between the amino acid asparagin, H-ions, and OH-ions. The results confirmed what Pfeffer had expected, and they agreed with his earlier analysis of data developed in 1888. 33 The whole question of the sensitivity of lower organisms was ignored for a long time after the early studies in Pfeffer's laboratory. ) has there been a renewed, successful investigation of the subject. 34 The new work examined in greater detail the faculty 51 Ahead of His Time: Wilhelm Pfeffer of discrimination in bacteria; at the same time, it showed that Pfeffer was correct when he wrote in reference to reception [term now used for perception] that there can be little doubt that the plasma membrane is involved in the process (1893d).
Stahl and W. 30 In 1884, and again in 1888, Pfeffer reported on the chemotaxis of the spermatozoa of ferns and30mosses and on the chemotaxis of bacteria and flagellata. The method used in the experiments was simple. The substance to be examined was put into capillary tubes that had been fused at one end. The open end of the capillary tube was inserted into drops of water containing micro-organisms. This was then studied under the microscope. In the case of positive chemotaxis, the micro-organisms accumulate around the mouth of the capillary tube and migrate into the tube (fig.