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Results for “Bufo bufo”

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At least 19 recordsLinked to original sources
PubMed1978

Blood-group A and G specific structures in toad (Bufo) spawn. Comparative studies on three species (Bufo bufo, Bufo viridis, Bufo calamita).

Permethylation analyses of the spawn material of three toad (Bufo) species allow the conclusion that the serologically determinant group in Bufo bufo spawn is identical with that found in human and hog blood-group A substances (i.e. GalNAc(alpha1,3) [Fuc(alpha1,2)] Gal -), and the serologically determinant group in Bufo viridis and Bufo calamita spawn is identical with that found in blood-group H substances (i.e. Fuc(alpha1,2) Gal -).

ABO Blood-Group System↗
PubMed1982

An autoradiographic study of cell kinetics in epidermis of the toad Bufo bufo bufo (L).

Under normal conditions, the toad Bufo bufo bufo molts about once a week. It was considered of interest to study whether the rhythmic pattern of cell loss through shedding of a stratum corneum is correlated with a rhythmic production of cells in stratum germinativum. An autoradiographic investigation of cell kinetics in toad skin using [3H]-thymidine and [14C]-thymidine as precursors revealed that cell production in stratum germinativum is a continuous process, and the cell production rate is much higher than is required for replacement of the cells lost with each molt. The parameters measured, i.e., % labeled cells, length of cell cycle, and S-phase, as well as migration of labeled cells from stratum germinativum toward stratum corneum support the assumption of an inhomogeneous cell population in stratum germinativum. A model proposed by Potten form the cellular organization of mouse epithelium provides a useful basis for the interpretation of the results obtained in the present study.

Animals↗
PubMed1982

Growth, differentiation, and function of the testes in the toad Bufo bufo bufo (L.), with special reference to regulatory capacities: effects of unilateral castration, hypophysectomy, and excision of Bidder's organs.

Function and compensatory growth of the testis have been studied in male toads of varying ages, ranging from postmetamorphosis to adults. All experiments lasted 2 months, starting about September 1. Spermatogenesis was normal in sexually immature, 1-year-old toads. The fastest growing young toads developed secondary sex characteristics, the thumbpads, during the experiment. The data suggest that size is more influential than age in determining the onset of sexual maturation. But body size is not the only factor which influences sexual maturation. The growth response of the remaining testis to unilateral castration decreased with increasing age and size of the toads. Two months after operation the remaining testis had reached the size of two testes in the young toads, whereas the testis showed no significant compensatory growth in the adult-sized toads, whether sexually immature or mature. Hypophysectomy reduced body growth in young toads and prevented a testicular growth response to unilateral castration. Young toads, but no adults, with excised Bidder's organs had larger testes than the control toads. In hypophysectomized, young toads spermatogenesis was still active 2 months after the operation.

Animals↗
PubMed1983

Cell kinetics in the epidermis of the toad Bufo bufo bufo (L.) after partial hypophysectomy followed by corticotrophin treatment (an autoradiographic study).

1. Cell kinetic parameters in the epidermis of partially hypophysectomized, ACTH-treated toads whose moulting frequency was increased threefold were studied using labelled thymidine and the autoradiographic technique. 2. The labelling index, length of S-phase and cycle time of stratum germinativum cells changed slowly as a function of the number of ACTH injections, and so did the migration of cells from stratum germinativum to stratum corneum. 3. A cell production in stratum germinativum of normal toads in excess of cell loss, as demonstrated by Levi & Nielsen (1982) should make it possible to maintain a status quo over a limited period of time following ablation of pars distalis and ACTH treatment.

Adrenocorticotropic Hormone↗