Items related to History of Chemistry
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ... CHAPTER XVI BIOCHEMISTRY As has been related, the old man-erected barrier of a hypothetical vital force was overthrown and organic chemistry developed into that branch of the science which embraced the largest number of known compounds, running up into the hundreds of thousands, and attracted most of the investigators-. It was realized that life processes, as they are still called, are identified with physical and chemical changes which obey the ordinary laws of those sciences and can be relied upon to bring about the usual results. These changes are definitely subject to the influence of the various forms of energy and take place normally at a normal temperature and under a normal pressure. Under changed temperature or pressure they take an abnormal direction or velocity. Many of the reactions belong to the reversible class. They also obey the mass law and are affected by changes of concentration. Until these facts were duly recognized the art of medicine was chiefly on an empirical basis and could not be called a science. The complexity of the molecules involved, many being colloidal in nature, and the diversity of the possible changes render this the most difficult of the sciences to master, requiring as it does an expert knowledge of physics, chemistry, and physical chemistry, besides other sciences. Just what constitutes life remains unknown. There is no spontaneous generation or autogenesis, and life processes which have once come to a definite end cannot be started again, though some of the minor reactions have been caused to repeat themselves under artificial conditions. So there is in a way a life barrier after all, but not one which forbids the reproduction of substances formed in plants and animals and which nullifies the laws...
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- PublisherRareBooksClub.com
- Publication date2012
- ISBN 10 0217003362
- ISBN 13 9780217003360
- BindingPaperback
- Number of pages44
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