SUBJECT IXOEX 



731 



Cyanide (contd.) 



of dihydroxynialeic acid oxidase, 434 

 of erythrocyte respiration, 515 

 of hydrogenase, 447 

 of oxidative action of hematin, 134 

 of peroxidases, 421, 430, 432, 433 

 of photocatalase, 450 

 of respiratory enzymes, 340, 348, 381 

 of respiratory ferment, 362, 363, 364 

 oxidation-reduction potentials of, hem- 

 atin compounds, 194 

 influence of pH on, 199, 381 

 and pseudohemoglobin formation, 490 

 Cyanide hemochromogen, dicyanide 

 ferroporphyrin. See Cyanide 

 {hematin compounds). 

 Cyanmethemoglobin. See Hem'xglohin 



(compounds). 

 Cysteine 



in green hematin formation, 490 

 linkages in cytochrome c and por- 

 phyrins c, 350 S. 

 oxidation by hematin, 341, 342 

 and urobilinogen formation, 552 

 Cytochrome system, 343. See also Cyto- 

 chromes, Cytochrome oxidase. Respir- 

 atory ferment. 

 in animals, 377, 379 ff. 

 biological function, 373 ff. 

 cytochromes in, 358, 374 ff., 376 (table) 

 importance for cell function and energy 

 supply, 376, 383 

 in respiration, 373, 374, 379 ff. 

 inhibition experiments, 374, 379 ff. 

 in nerve function, 383 

 in plants, 379, 380, 382, 384 

 in resting muscle, 381 

 in sea urchin eggs, 381 

 in thyroxine formation, 384 

 Cytochromes, 343. See also specific 

 cytochromes, 

 as hemochromes, 343 

 in microorganisms, 344 ff., 346 (table), 



380, 383 

 oxidation reduction-potentials, 195, 



374, 376 (table) 

 reaction with hydrogen donors, 374 ff. 

 spectroscopic data, 344 ff. 

 Cytochrome a, 344 ff., 360 



and cryptohemochrome, 360, 361 

 as mixture of a and a^, 346, 360 

 Cytochrome a„ 345, 346, 361, 365 

 absorption band at 639 m/n, 365, 432 



cyanide compound, 365 



and cytochrome oxidase, 370 



as respiratory ferment of Acetobacter, 

 366 

 Cytochrome a ., 345, 346 (tal)le), 370 



and bile pigment hemochromes, 371 



as respiratory ferment in bacteria, 370, 

 375 

 Cytochrome a„ 360, 367 



CO-compound, 369 



and cyanide, 364, 369 



in cytochrome a preparations, 369 



relations to cytochrome oxidase, respir- 

 atory ferment, and cytochrome 

 a„ 370 

 Cytochrome b, 344, 345, 358 



autoxidizability, 358 



biological function, 358, 374 ff. 



complexes with dehydrogenases, 360 



and narcotics, 359 



oxidation-reduction potential, 358 



in plants, 379 



reduction by hydrogen donors, 358 



transformation into protohemochrome, 

 345 

 Cytochrome b, 



in actinia. See Actiniohematin. 



in adrenal medulla, 359 



in microorganisms, 344 ff., 346 (table) 



in plants, 379 

 Cytochrome bo, isolation from yeast, 359 



and yeast lactic acid dehydrogenase, 359 

 Cytochrome c, 347 



absorption spectrum, 177 (table), 

 344 ff., 348, 349 (table), 351, 

 354 (table) 



in adrenaline oxidation, 375 



anabolism, 627 



in A.^caris, 416 



catabolism, 568 



cyanide compound, 348 



and cytochrome oxidase, 377 (table), 

 378, 379 ff. 



electrometric titration, 352, 353 



estimation, 349 



ferricytochrome c, different forms, 352, 

 354 (table) 



in glutathione oxidation, 376 



and hydrogen donors, 356 



iron content, 347 



isolation, 347 



linkage of prosthetic group, 251, 256, 

 350, 354 (table) 



