Testicular Leydig cells and 277-1277-1277-1dehydrogenase in cadmium-treated toads (Bufo melanostictus)

Summary Injection of cadmium chloride in toad increased Leydig cell size (area) and ₅-3-hydroxysteroid dehydrogenase activity in the testis.Acknowledgments. We would like to express our thanks to Dr C. Deb, Head of the Department of Physiology, Calcutta University, for his constant encouragement and Mr R. K. Bhattacharya, Microphotographer, Department of Physiology, for his kind cooperation. This work was supported by U. G. C. Teachers' Grants, New Delhi.     

Serological relationships of frogs (Ranidae) and toads (Bufonidae)

Zusammenfassung Das Ergebnis der immunoelektrophoretischen Untersuchungen zeigt einen gewaltigen Unterschied in den serologischen Mustern der Frösche (Ranidae) und Kröten (Bufonidae). Die amerikanischen Vertreter der Ranidae und der Bufonidae haben sehr wenig gemeinsame Serumantigene. Der Mangel an gemeinsamen antigenischen Bestandteilen in ihren Serumproteinen weist sowohl auf eine frühe Evolutionstrennung des Frosches und der Kröte wie auch auf ein merkliches genetisches Auseinandergehen der zwei Stämme während der langen Zeitspanne isolierter Existenz hin.

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The work was supported by grant No. GM-11782 from the U.S. Public Health Service.     

Genome size in the green toad (Bufo viridis) group

Summary Specimens of the green toad,Bufo viridis, from Morocco to Kirgizistan, have identical DNA amounts per erythrocyte nucleus. 1 specimen from Kirgizistan is a tetraploid. Of 3 closely related species,B. calamita andB. brongersmai have about the same DNA amount asB. viridis, whileB. latastii from Afghanistan has 36% more DNA per nucleus.     

Ascorbic acid and testicular activity in heat-exposed toad (Bufo melanostictus)

Résumé On a trouvé que la fonction du testicule et la concentration de l'acide ascorbique dans cette glande ont été augmentées chez les crapauds exposés à la chaleur.     

Effect of carbon tetrachloride intoxication on the liver of toad (Bufo melanostictus)

Résumé Les auteurs constatent que le tétrachloride de carbone ne cause pas de dommage au foie du Crapaud non hibernant, mais provoque une dégénérescence de cet organe pendant l'hibernation de l'animal. Ils émettent des suggestions quant au mécanisme auquel seraient due cette différence.     

The involvement of cyclic 3′, 5′-adenosine monophosphate in the growth hormone release mechanism (s)

Riassunto II 3', 5'-AMP dibutirrato (5 g) iniettato nel ventricolo laterale del cervello di ratto, provoca una spiccata liberazione deH'ormone somatotropo soltanto in animali pretrattati con teofillina (50 mg/kg s.c). La teofillina per via s.c. (50 mg/kg) si dimostra inattiva, ma libera ormone somatotropo quando e iniettata per via endoventricolare (5 g). Uno stimolo usualmente incapace di liberare somatotropo (formalina) provoca deplezione dell'ormone dall'ipofisi in ratti pretrattati s.c. con teofillina. I risultati sono in favore di una partecipazione del 3', 5-AMP nel meccanismo di liberazione di ormone somatotropo.

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Supported by USPHS Research Grant No. HD 01109-03.