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 ebook exhibits Pfeffer as a instructor and author with extensive examine pursuits, incisive experimental abilities, and a questing brain. Dr H.Wilhelm Pfeffer, grandson of Wilhelm Pfeffer, offers the interpretation for this English variation.
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Extra info for Ahead of His Time: Wilhelm Pfeffer, Early Advances in Plant Biology
Pfeffer tried over and over again before he was able to find a really usable type of porous pot. " That later researchers had great difficulty in making osmometers of the same quality is proof of his experimental skill. It took H. N. 19 Fig. 6 (See previous page) Diosmometer of Dutrochet. In the glass bulb is a sugar solution; in the surrounding container is water. A (semipermeable) pig's bladder separates the two solutions. " After H. Walter (cf. 5). Fig. 7 (See previous page) Osmometer (after Pfeffer's original drawing).
Generally assumed that there existed a molecule of oil at the surface of the protoplasm just as in the case of water and oil (1886a, 1890e). Pfeffer used vital staining with analine dyes to study the passage of matter through the plasma membrane and to investigate plant cell exchanges. The vital staining of plant cells had first been observed twenty years earlier. Heidenhain, in particular, made use of vital staining for animal cells. It was Pfeffer who introduced this method in his investigations of the plasma membrane and of plant cell exchanges.
Chemotaxis in this sense was discovered simultaneously and independently by E. 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.
Ahead of His Time: Wilhelm Pfeffer, Early Advances in Plant Biology by Erwin Bunning, Hermut Wilhelm Pfeffer