Word: micro
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Dates: during 1920-1929
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...French Academy. He objects to the idea that the origin of sex differences is to be found in differences in the male cells only, and claims that both the spermatozoon and the ovum have activating " microcellules." These seek their complement in the other sex cell, but if the male micro-cellules preponderate in number over the female the result will be a male embryo, and vice versa. But Alich also believes that various other factors affect this potential energy of the germ cell, including potency, fatigue, old age, and has evidence for this from horses, sheep and roosters. Dr. James...
...micro-vivisection" apparatus so delicate that it enables scientists to dissect living cells has been perfected by Professor C. E. Tharaldsen, of the Department of Zoology, Northwestern University. It consists of a brass lever moved by three finely adjusted screws, manipulating special glass needles which can be brought to bear upon a cell suspended in a drop of nutrient fluid under the lens of the microscope. The needles, the essential part of the machine, are finer than hairs and are formed like a "J" or an "L." The apparatus is superior to similar devices now in use, in that...
...tuberculosis, was the first to recognize that there were distinct differences between the bovine and human tubercle bacilli, and contributed to our knowledge of hog cholera, anaphylaxis, contagious abortion of cattle and streptococcic sore throat. He discovered several new parasites of the lower animals, one of them the micro-organism of blackhead in turkeys, a disease of large economic importance. This discovery will help reduce the cost of Thanksgiving dinners. He has devised many laboratory procedures; one of these, the fermentation tube, is universally used by bacteriologists for the study of gas formation by bacteria...