Showing papers on "Bufo melanostictus published in 1984"
TL;DR: Injection of cadmium chloride in a toad increases both the 5-3β-Hydroxy-steroid dehydrogenase and 17β-hydroxysteroid dehydration activities in Bidder's organ.
Abstract: Injection of cadmium chloride in a toad increases both theΔ5-3β-hydroxy-steroid dehydrogenase and 17β-hydroxysteroid dehydrogenase activities in Bidder's organ.
18 citations
TL;DR: Five novel bufotoxins, bufotalin 3-suberoyl-L-histidine, -3- methylhistidine and -1-methylhistidine esters and 19-hydroxybufalin 3-SuberoyL-L/L- historicalidine, were separated by usual chromatographic methods including reversed phase high-performance liquid chromatography, and their structures were elucidated by degradative and synthetic means.
Abstract: The occurrence of new bufotoxins, in which L-histidine, L-3-methylhistidine, or L-1-methylhistidine replaces the arginine residue of hitherto known "bufotoxin, " in the skin of the Formosan toad, Bufo melanostictus SCHNEIDER, is reported. Five novel bufotoxins, bufotalin 3-suberoyl-L-histidine, -3-methylhistidine and -1-methylhistidine esters and 19-hydroxybufalin 3-suberoyl-L-histidine and -3-methylhistidine esters, were separated by usual chromatographic methods including reversed phase high-performance liquid chromatography, and their structures were elucidated by degradative and synthetic means.
16 citations
TL;DR: The relationship between the pineal gland and testes of the toad was investigated in breeding and hibernating seasons and it is speculated that the cyclic pineal activity might be responsible for the seasonal variation of spermatogenesis in the toads.
Abstract: The relationship between the pineal gland and testes of the toad was investigated in breeding and hibernating seasons. Pinealectomy increased spermatogenesis in hibernating toads but it failed to exert any effect during the breeding season. The pineals were found to be active during hibernation and atrophied in the breeding season. It is speculated that the cyclic pineal activity might be responsible for the seasonal variation of spermatogenesis in the toad.
12 citations
TL;DR: Two novel bufotoxins, bufotalin 3-suberoyl-histidine and -3-methyl- histidine esters, were isolated from the skin of the Formosan toad, Bufo melanostictus Schneider.
8 citations
TL;DR: Ascorbic acid content reaches a peak level in liver in group III male toads and then declines significantly, but there is no significant age-related change in ascorbic acid in the brain of male toad or in liver and brain of female toads.