Results 191 to 200 of about 132,738 (254)

A study of hemoglobin differentiation in Rana catesbeiana

Developmental Biology, 1963
The hemoglobins of tadpole, metamorphosing tadpole, and frog (Rana catesbeiana) have been studied. Starch-gel electrophoresis has shown the presence of three hemoglobins in tadpoles and four different hemoglobins in frogs; metamorphosing tadpoles have both tadpole and frog hemoglobins.
C, BAGLIONI, C E, SPARKS
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Rana catesbeiana (Shaw) (Bullfrog) 2n = 26

1973
One pair of medium-sized submetacentric chromosomes has a prominent secondary constriction in the long arm. Another pair of medium-sized submetacentric chromosomes has a conspicuous secondary constriction in the short arm.
Maria Luiza Beçak, Willy Beçak, Franklin L. Roberts, Robert N. Shoffner, E. Peter Volpe   +4 more
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Plasma catecholamines with hemorrhage in the bullfrog,Rana catesbeiana

The Journal of Experimental Zoology, 1998
The concentrations of plasma epinephrine (E) and norepinephrin (N) measured at rest in bullfrogs (Rana catesbeiana) were 12.0 and 8.2 nmol liter-1 respectively: the ratio of [E]/[N] was 1.33 (+/- SE 0.35). Adrenal glands contained high concentrations of epinephrine (2,923 nmole g wet weight-1) and norepinephrine (6,194), at a ratio of 0.46 (+/- SE 0.04)
S, Hillman, P, Withers, P, Kimmel
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Chromosome studies of the lethal hybrid Rana pipiens ♀ × Rana catesbeiana ♂

Developmental Biology, 1969
Abstract Developmental arrest of amphibian interspecific hybrids about the time of gastrulation may be causally related to chromosomal breakage and loss during cleavage. This paper presents the karyotypes of white blood cells of adult Rana pipiens and Rana catesbeiana , and evidence that hybrids between Rana pipiens ♀ × Rana catesbeiana ...
James K. Reynhout, Donald L. Kimmel
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Anticipatory feeding behaviour in the bullfrog (Rana catesbeiana)

Animal Behaviour, 1967
Abstract The feeding behaviour in a laboratory colony of bullfrogs was studied by means of timelapse photography. It was found that the animals evidently anticipate the time and place of feeding, since they aggregate near the feeding site in advance.
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Auditory Sensitivity in the Tadpole (Rana catesbeiana)

The Journal of the Acoustical Society of America, 1973
Auditory sensitivity in six bullfrog tadpoles was investigated by electrophysiological techniques. Tonal stimulus intensities that generated a standard potential of 0.1 μV in the inner ear showed a hearing range from 100 to 4000 Hz with maximum sensitivity near 1 dyn/cm2 (0.1 N/m2) in the lower portion of the range.
B. A. Weiss, B. H. Stuart, W. F. Strother   +2 more
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Auditory Sensitivity in the Rana catesbeiana Tadpole

Journal of Herpetology, 1973
Auditory sensitivity in 6 bullfrog tadpoles (Rana catesbeiana) was investi- gated electrophysiologically. Tonal stimulus intensities that elicited a standard sensory potential of 0.1 ,v in the inner ear showed a response range from 100 Hz to 4000 Hz with maximum sensitivity near one dyne/cm2 (0.1 N/m2) in the lower portion of the range.
Burton A. Weiss, Bradley H. Stuart, William F. Strother   +2 more
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Tympanic sound radiation in the bullfrog Rana catesbeiana

Journal of Comparative Physiology A: Sensory, Neural, and Behavioral Physiology, 1997
Members of the Rana catesbeiana clade display sexually dimorphic eardrums. In this species assemblage the eardrum of males can be 50% larger than in females of the same body size. There has been, however, no apparent functional explanation for this dimorphism.
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Dye-coupling among frog (Rana catesbeiana) taste disk cells

Comparative Biochemistry and Physiology Part A: Physiology, 1992
1. Dye-coupling among taste disk cells in the bullfrog fungiform papillae was examined histologically by injecting a fluorescent dye (Lucifer yellow) into the cell, and the effects of the dye-coupling on depolarizing responses induced by taste stimuli were studied electrophysiologically. 2.
O, Sata, Y, Okada, T, Miyamoto, T, Sato
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Purification and properties of serum albumin from Rana catesbeiana

Biochimica et Biophysica Acta (BBA) - Protein Structure, 1972
Abstract Serum albumin was purified from the plasma of the bullfrog, Rana catesbeiana , by a combination of Sephadex G-200 and DEAE-cellulose column chromatography, and isoelectric focusing fractionation. The purified albumin was judged to be homogeneous by several criteria: acrylamide disc and cellulose acetate electrophoresis, immunological ...
H, Nagano, T, Shimada, R, Shukuya
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