Der morphologische Farbwechsel von Xenopus laevis-Larven

Pehlemann, F. W.

doi:10.1007/bf00334283

Cited by 11 publications

(2 citation statements)

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“…Recently, the fine structure of the intermediate lobe of the pituitary has been studied in amphibians (Iturriza, 1964;Imai and Oota, 1965;Cohen, 1967;Pehlemann, 1967;Saland, 1968;Ito, 1968). It was reported that there exist two types of granules; relatively small vesicles and large droplets (in Bufo arenarum: Iturriza, 1964; Xenopus leveis: Imai and Oota, 1965;Rana pipiens and Rana catesbeiana: Saland, 1968).…”

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confidence: 99%

Separation of Granules Containing Melanophore Stimulating Hormone from Frog (<I>Rana Catesbeiana</I>) Pars Intermedia

Kikuyama

Yasumasu

1972

Endocrinol Japon

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SynopsisGranules containing melanophore stimulating hormone were separated from bullfrog pars intermedia by differential centrifugation and sucrose gradient centrifugation. These granules were present in the supernatant after centrifugation at 650g for 15min and were sedimented by centrifugation at 11,000g for 15min. Sucrose gradient centrifugation of this fraction revealed that MSH activity was present in granules having a density equivalent to 1.6-1.7 M sucrose solution and a diameter 1,500-3,000A. From their size and structure, it is concluded that MSH granules are the small electron-dense granules and not the large colloidal granules observed in electron micrographs of the pars intermedia.

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Separation of Granules Containing Melanophore Stimulating Hormone from Frog (<I>Rana Catesbeiana</I>) Pars Intermedia

Kikuyama

Yasumasu

1972

Endocrinol Japon

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“…Our data on the dynamics of the num ber of melanophores in tadpoles of B. bufo of different stages of development indicate a change in the number and type of cells over skin layers, especially strongly pronounced with the beginning of rearrangement of organs during metamorphosis. According to evidence of Pehlemann (1966Pehlemann ( , 1967, in larvae of the spur toed frog, an increase in the number of dermal melano phores occurs by 80% at the expense of cell division and by 20% at the expense of differentiation of mel anoblasts. The particular reasons for the simultaneous increase in the number of cells in different skin layers in tadpoles of the common toad were not established; however, it is possible that here also regularities distin guished by Pehlemann act.…”

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confidence: 99%