Advances of Modern Science by Melvin Berger PDF

By Melvin Berger

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He had accomplished the task he had set for himself—to get the tobacco virus out of the diseased leaves. After years of cutting and pressing, and dozens of chemical steps, Stanley had obtained less than a spoonful of a fine, white powder. Stanley took the position that the powder was a chemical substance without life. Who had ever heard of such a thing? How could disease be caused by a substance that was not alive? The pure virus could be kept in a bottle, just like hundreds of other chemicals.

Physiology, the study of how the 47 Advances of Modern Science parts of animals and plants work, gave Freud his; greatest pleasure. He soon began to study the; nervous systems of men and animals. As an aid in! this work, he studied medicine and became a doc- ' tor, even though he did not intend to work as a; doctor. After his marriage in 1886, and as his family began to grow, he realized that he would have to open an office as a doctor to support his wife and his six children. Since his work had been on the nervous system, it is not surprising that Freud treated diseases of the nervous system.

Bawden and Norman W. Pirie, found something else in the tobacco virus that Stanley had not seen. They discovered that although most of the virus was protein, a small 34 Virus part was nucleic acid, similar to the substance found in the nucleus of the cell. The nucleic acid in the virus was studied closely by Alfred D. Hershey and Martha Chase at the Carnegie Institution Laboratory at Cold Spring Harbor in New York. In 1952 they were working with a type of virus that attacks bacteria rather than plants.

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Advances of Modern Science by Melvin Berger

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