. The Biochemical journal. Biochemistry. \iW R. S. /I I A'A The ;il)ovo oxpoiimont shows tlmt tlic exposuro to the ultra-violet rays dill not, entirely destroy the antitieuritie activity of the autolysed yeast. It was desirable to ascertain w hct hci the aiitineuritic activity was at all ini])aired hy the exposure to the light. Rats were found convenient animals for that puipose. These animals if kept on a diet free from the antineuritic do not jirow and eventually die after about 6 weeks. If, however, the antineuritic is supplied after the deficiency has been enforced for several weeks iioiin
. The Biochemical journal. Biochemistry. \iW R. S. /I I A'A The ;il)ovo oxpoiimont shows tlmt tlic exposuro to the ultra-violet rays dill not, entirely destroy the antitieuritie activity of the autolysed yeast. It was desirable to ascertain w hct hci the aiitineuritic activity was at all ini])aired hy the exposure to the light. Rats were found convenient animals for that puipose. These animals if kept on a diet free from the antineuritic do not jirow and eventually die after about 6 weeks. If, however, the antineuritic is supplied after the deficiency has been enforced for several weeks iioiinal growth is immediately resumed. In this experiment tlirce rats w^ere employed. Their diet was made up as follows: Basal mixture 10 g. Antiscorbutic equivalent to lemon juice 5 cc. Centrifuged butter-fat 1-8 g. Olive oil 1-6 ,, The basal mixture was made up of 75 % starch, 20 % caseinogen and 5 % salts. 190 170- 150. 130- 110 — 1 2 3 4 5 6 7 8 9 10 11 12 Fig. 3. The first perpendicular dotted line marks the time at which the administration of the exposed juice was commenced and the second hne that of the unexposed juice of the same batch. As will be seen from Fig. 3, two of the rats (Nos. 228 and 229) showed no growth for 4| weeks; the third animal (No. 227) showed little growth, much below the normal. After 4J weeks No. 227 received in its daily ration 1 cc. No. 228 3 cc. and No. 229 5 cc. of autolysed yeast juice exposed to ultra- violet rays. All the three animals commenced growing. The improvement. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Biochemical Society (Great Britain); University of Liverpool. Biochemical Dept. London [etc. ] Cambridge University Press
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