SUBJECT INDEX 



003 



Euglena (jracih's, 477, 4S(), 4S5, 4S7 



in vitamin Bu asstiy, 457, 460, 461, 

 463-464, 475 

 Extinction coefficient, 



definition, 88 

 Extracellular substance, 



formation in scurvy, 303-304 

 "Extrinsic factor", 476, 493, see also 



Vitamin B13 

 Eye, 



in vitamin A deficiency, 110-111 



Factor W, see Biotin 



Factor X, 508, 510-511, see also Biotin 



identification of, 514-515 

 Fat(s), 



ascorbic acid and, 317-319 



in biotin deficiency, 601, 613-614 



in scorbutic animals, 309 



effect in vitamin B12 deficiencj^ 517 

 Fatty acids, 333 



biotin and, 581 



in biotin replacement, 564-566 



in carotene oxidation, 106 



effect on provitamin A assay, 93 



oxidation in scurvy, 319 

 Ferridipyridyl, 248 

 Fertilizers, 



effect on ascorbic acid sj'nthesis, 217- 

 218 

 Fever, 



effect on ascorbic acid retention, 337- 

 338 

 Fibrinogen, 343 



in scurvy, 293 

 Fibroblasts, 273, 302, 304-305 



effect of ascorbic acid on, 274 



in scurvy, 371-372 

 Fish liver oils, 26 



vitamin A assaj' of, 90-92 

 Flavone-peroxidase, 225 

 Flavones, 



in ascorl)ic acitl oxidation, 225 

 Flavonoids, 3S7 

 Flavoprotein, 575 



Folic acid, 364, 423, 425, 476, 496-497, 

 500, 501, 506, 508, 518, 519, 603 



p-aminobenzoic acid and, 430-431 



antibiotics and, 499 



ascorbic acid and, 330-331 



coproj)hagy and, 5SS 



deficiency, 502, 601 



effect on anemia, 444 



formate and, 430 



in citrovorum factor synthesis, 241- 

 242 



inhibitor of, 496 



methionine metabolism and, 434, 435, 

 438, 441 



relation to biotin, 602 



in scurvy, 366-367, 369, 371 



in thyrotoxicosis, 444 



in tyrosine oxidation, 314-315 



in vitamin B12 deficiency, 446, 491, 497 

 Folinic acid, see also Citrovorum factor 



formation, 330 



in scurvj', 366-367 

 Foodstuffs, 



ascorbic acid content of, 261-264, 

 265-268 



biotin in, 595-599 



storage of, 264 



vitamin A assay of, 91 

 Formaldehyde, 65, 185, 425, 429 



in ascorbic acid assay, 255 



in vitamin A synthesis, 42 

 Formic acid, 230, 425, 429 



in dehydroascorbic acid reduction, 236 



in methionine formation, 441-442 

 Formic dehydrogenase, 232 



in dehydroascorbic acid reduction, 230 

 Foxes, 



vitamin A requirements of, 166 

 Fraction A, 



vitamin Bi2-activity of, 485-487 

 Fraction B, 



vitamin B^-activity of, 485-487 

 Fraction C, 



vitamin Bi2-activity of* 485-487 

 Fructose, 196 



effect on biotin requirement, 565, 616 



in ascorbic acid synthesis, 213-214 

 Fruits, 



ascorl)ic acid assay of, 244 

 Fumaric acid, 573, .582-583 



in aspartic acid synthesis, 576-577 



in citrulline sjnthesis, 581 



requirement for, 456 



vitamin lin and, 475, 484-485 

 Furfuraldehyde, 183, 200 



