A textbook of biochemistry for students of medicine and science / by A.T. Cameron.
- Alexander Thomas Cameron
- Date:
- 1938
Licence: In copyright
Credit: A textbook of biochemistry for students of medicine and science / by A.T. Cameron. Source: Wellcome Collection.
51/454 page 39
![which bring about reactions with these compounds, are themselves optically active ; their chemical activity is affected and controlled by their optical activity. Each optically active substance produces a rotation effect the degree of which depends on the specific effect of the molecules of that substance, and the number of molecules of it that are acting. Consequently we are able to speak of the specific rotatory power, [a]D, (D being the sodium line of the spectrum that is used for accurate measurements), which can be calculated from the formula. t° . ,1° a ^ where a is the observed rotation at t° of p grams of substance, dissolved in 1 c.c. of liquid, and l is the length of tube, containing the solution, in decimetres. For the actual method of measurement practical textbooks must be consulted. REFERENCES Taylor, H. S., and others. “A Treatise on Physical Chemistry,” 2nd ed. (D. Van Nostrand Co. Inc., New York, 1931). Hitchcock, D. I. “ Physical Chemistry for Students of Biology and Medicine ” (C. C. Thomas, Springfield, Ill., 1932). Cameron, A. T. “ A note on the numbers of molecules and ions present in a single cell,” Trans. Roy. Soc. Canada, 1929, Sect. V., 151.](https://iiif.wellcomecollection.org/image/b2992859x_0051.jp2/full/800%2C/0/default.jpg)
