SUBJECT INDEX 



745 



Tetrahy(lroniesobilene-(l)) (coutd.) 

 separation from mesobiliviolin, 141 

 spectroscopic differentiation from meso- 

 bilene-(b), 143 

 Tetrapyrrenes, 105 

 Tripyrrenes, resembling biliviolins, 106 



Uable), 126 

 Tripyrrylmethanes, in pyrromethene 



synthesis, 58, 635, 636 

 Tryptophane, in hemoglobin synthesis, 



610, 633 

 Tumors, cytochrome system in, 376, 377 



(table), 378 

 Turacin, 6, 50 (table), 68, 241, 588 



U 

 Urechrome, 225, 654 

 Urobilins, 134, 137 (table). See also 

 Mesobilene-{b), Tetrahydromesobilene- 

 (b). 

 absorption from intestine, 555 

 destruction in body, 555 

 enterohepatic circulation, 504, 554, 555 

 excretion, 510, 541, 551, 555, 556, 558 

 and bilirubin formation, 510, 555 

 in disease, 537, 541, 557, 558 

 after hematin injection, 575 

 and life span of erythrocyte, 510 

 in urine, 555, 558 

 formation in man, 504, 545, 550 ff. 

 by bacteria, 551, 553 

 enzymes in, 552, 554 

 extraintestinal, 553 

 in fetus and newborn, 554 

 intestinal, 551 

 in serum, 557 

 rf-Urobilin, 137 (table), 143, 553 

 Urobilin IXa. See Me.iobilene-{b). 

 Urobilinogens. See also Mesobilane, 

 Tetrahydromesobilane. 

 estimation, 156 

 Urobilinoid substances, 107. See also 

 Bile pigment classes, Choletelin, 

 Porphobilin. 

 Urochrome B, 559 



Uroporphyrin, 50 (table), 51 (table), 53 

 (table), 66, 69 (table), 74 (table), 75 

 (table), 76 (table). See also Turacin. 



Uroporphyrin (coutd.) 



in bones, 50 (table), 581, 6.30, 631 



excretion in disease, 589 ff., 591 (table) 



fate of injected, 581, 582, 589 



isolation, 86 



isomerides, 66-68, 587, 591 (table) 



in Pteria mussel, 50 (table), 66 



in porphyria, 66, 591, 592 



in Sciuru.s niger, 50 (table), 584, 638 



synthesis, theory of, 637 ff. 



Uteroverdin. See Biliverdin. 



Vanadium 



chromogen of Ascidiatix, 570, 648 



complexes of porphyrins, 648 

 Verdins (closed ring), 114 

 "Verdoglobins," 454 ftable), 455. See 

 also Choleglobin, Cruoralbin, Pseudo- 

 hemoglobin, Sulfhemoglobin. 

 Verdohematin, 455 ff., 461, 463, 464 ff. 



nomenclature, 453, 455 



structure, 464 

 Verdohemochromes, 454 (table), 456-470 



absorption spectrum, 454 (table), 462 



from catalase> 499 



from cytochrome c, 499 



formation from hemochromes, 456-459, 

 467-470 



iron valency, 462 



magnetochemistry, 463 



mechanism of formation, 468 



oxidation of, 467 



preparation, 461 



reduction to yellow compounds, 462, 

 465 



transformation into monazahemo- 

 chromes, 202, 464 

 "Verdohemochromogens," 453, 479, 492 

 Verdohemoglobin, 208, 240, 454 (table), 



455, 463 

 Verdoperoxidase. See Peroxidases. 

 Violacein, 153 

 Viridans effect, 480 



Xanthorubin, 150, 539 



