Results 121 to 130 of about 4,407 (178)

Oxygen transport in the bullfrog retina

Experimental Eye Research, 1980
Abstract In an isolated bullfrog retina preparation, macro- and micropolarographic techniques were used to measure retinal oxygen consumption in (1) the presence of active sodium transport, in light and darkness, and (2) conditions in which Na + transport was inhibited by iso-osmotic Na + replacement or ouabain.
R, Zuckerman, J J, Weiter
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Homotransplantation Immunity and Tolerance in the Bullfrog,

The Journal of Immunology, 1959
Summary The bullfrog, Rana catesbeiana, is capable of giving a vigorous isoimmune response to skin homografts, both as a larva and as an adult. First-set skin homografts showed the same median survival times (11.8 ± 0.6 to 13.6 ± 1.0 days) at 25°C on animals ranging in age from 2 months to 2 years.
W H, HILDEMANN, R, HAAS
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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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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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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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Adrenergic mechanisms in the bullfrog and turtle

American Journal of Physiology-Legacy Content, 1965
Epinephrine and norepinephrine contents of tissues and perfusates have been measured by fluorimetric methods to ascertain which catecholamine is the sympathetic transmitter in bullfrogs and turtles. Except for adrenal and sympathetic chain, the predominant catecholamine in bullfrogs is epinephrine.
T, Azuma, A, Binia, M B, Visscher
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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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