Practical physiological chemistry; a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . i-oxide by yeast is not necessarily a criterion of the presence of sugar. The presence ofan enzyme called carftovy/fl^e has been demonstrated in yeast which has the power ofsplitting off C02 from the carboxyl group of amino-and other aliphatic acids. ^ Neuberg and .Associates: Biochcm. Zcitscli., 31, 170; 32, T,2y, 36, (60, 68, 76), 1911. 32 PHYSIOLOGICAL CHEMISTRY ray is caused to pass through a polarizing Nicol prism it is resolvedinto tivo rays,
Practical physiological chemistry; a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . i-oxide by yeast is not necessarily a criterion of the presence of sugar. The presence ofan enzyme called carftovy/fl^e has been demonstrated in yeast which has the power ofsplitting off C02 from the carboxyl group of amino-and other aliphatic acids. ^ Neuberg and .Associates: Biochcm. Zcitscli., 31, 170; 32, T,2y, 36, (60, 68, 76), 1911. 32 PHYSIOLOGICAL CHEMISTRY ray is caused to pass through a polarizing Nicol prism it is resolvedinto tivo rays, one of which \dbrates in every direction as before and asecond ray which vibrates in one plane only. This latter ray is said tobe polarized. Many organic substances (sugar, proteins, etc.) have thepower of twisting or rotating this plane of polarized light, the extent towhich the plane is rotated depending upon the number of moleculeswhich the polarized light passes. Substances which possess this powerare said to be optically active. The specific rotation of a substance isthe rotation expressed in degrees which is afforded by i gram of sub-. FiG. 5-—One Form or Laurent Polariscope. B, ^Microscope for reading the scale; C, a vernier; E, position of the analyzing Nicol prism;H, polarizing Nicol prism in the tube below this point. Stance dissolved in i of water in a tube one decimeter in specific rotation, (Q:)n, may be calculated by means of the followingformula: Wz,= in which J) = sodium = observed rotation in — grams of substance dissolved in i of = length of the tube in decimeters. If the specific rotation has been determined and it is desired to ascer-tain the per cent of the substance in solution, this may be obtained bythe use of the following formula, P = {a)D I The value of p multiplied by loo will be the percentage of the sub-stance in solution. CARBOHYDRATES 33 SPECIFIC ROTATIONS OF MORE COMMON CARBOHYDRATES i <
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiochem, bookyear1916
