Results 161 to 170 of about 6,947 (213)

Immunoglobulin Synthesis in Bullfrog Larvae

The Journal of Immunology, 1973
Abstract The antibody-synthesizing capacity of tadpoles (Rana catesbeiana) has been studied with sheep erythrocytes as antigen. Tadpoles can mount an immune response similar to that seen in higher vertebrates except for a slower kinetic profile. They could not, however, be stimulated to elicit a true anamnestic response. The antibody had
E J, Moticka, B A, Brown, E L, Cooper
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Bullfrog

2002
The fact sheets provide information regarding the 71 different species of reptiles and amphibians in New Jersey. The purpose of the fact sheets is to help residents and visitors identify the many species throughout the state.
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Nuclear organization of the bullfrog diencephalon

Journal of Comparative Neurology, 1983
AbstractA cytoarchitectonic analysis was performed on the diencephalic nuclei of the bullfrog, Rana catesbeiana. The epithalamus contains two widely recognized habenular nuclei. The thalamus has three subdivisions: dorsal and ventral thalamus, and posterior tuberculum.
T J, Neary, R G, Northcutt
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Biological Activity of Bullfrog Growth Hormone in the Rat and the Bullfrog (Rana catesbeiana)

Endocrinology, 1977
Highly purified bullfrog growth hormone (GH) was tested for growth promoting activity in rats and bullfrogs (Rana catesbeiana). In repeated assays, the potency of bullfrog GH in the rat tibia assay was 1 X bovine GH, which is significantly greater than all other non-mammalian GHs tested.
S W, Farmer, P, Light, H, Papkoff
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Analysis of Oxygen Transport in Bullfrogs

1978
The O2 transport system in frogs is different from other higher vertebrates, because of the structure of their heart consisting of the two atria and one ventricle, and rather similar to the mammalian fetuses (Dawes et al., 1954) and avian embryos (Tazawa and Mochizuki, 1977).
H, Tazawa, M, Mochizuki
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Cytoplasmic cylinders in bullfrog oocytes

Journal of Ultrastructure Research, 1968
Electron microscopic studies of developing bullfrog tadpole oocytes have demonstrated cylindrical structures, 150 m μ in cross-sectional diameter and with a linearly continuous central core 35 m μ in diameter, present singly and in tangled or parallel clusters within the cytoplasm.
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The Labyrinth of the American Bullfrog

2015
The labyrinth of the American bullfrog (Rana catesbiana) has been studied by aid of light and electron microscopy. Cell counts and sensory area mapping has been made and it has been shown that scanning electron microscopy is the most appropriate technique at present for cell counts.
H. Engstr�m, B. Engstr�m, K. Watanuki   +2 more
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Plasma 5α-dihydrotestosterone and testosterone in the bullfrog, Rana catesbeiana: Stimulation by bullfrog LH

General and Comparative Endocrinology, 1977
Effects of purified bullfrog (Rana catesbeiana) LH and FSH on plasma levels of the androgens, testosterone (T), and 5α-dihydrotestosterone (DHT), were studied using adult male bullfrogs. Rana LH was considerably more potent than Rana FSH in stimulating increased plasma androgen levels in hypophysectomized and intact animals.
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Sexual Dimorphism in Bullfrogs

Ecology, 1981
Data on body size, age/size at sexual maturity, and adult survival were obtained between 1975 and 1978 for a population of bullfrogs, Rana catesbeiana, at the E. S. George Reserve of the University of Michigan. Both males and females continued to grow when adults; older individuals were often 50% larger than newly matured individuals.
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The inner ear of the bullfrog

Journal of Morphology, 1964
C D, GEISLER, W A, VANBERGEIJK, L S, FRISHKOPF   +2 more
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