Results 171 to 180 of about 10,107 (221)

Temperature selection by the bullfrog, Rana catesbeiana

Comparative Biochemistry and Physiology Part A: Physiology, 1971
Abstract 1. 1. Behavioral responses of juvenile bullfrogs, both in an aquatic temperature gradient and in an apparatus which offers a choice of discrete water temperatures, demonstrate a capability for maintaining specific levels of nearly constant body temperature by selection of an appropriate thermal environment. 2. 2.
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Multiple adenosine deaminases in the frog (Rana catesbeiana)

Comparative Biochemistry and Physiology, 1968
Abstract 1. 1. Three classes of adenosine deaminases have been found in frog tissues. Types A, B and C have molecular weights in the range of 180,000, 100,000 and 35,000 respectively. Studies of tissues from a wide variety of vertebrates have shown that all of these enzyme types are widespread among vertebrates (Ma & Fisher, unpublished results).
P F, Ma, J R, Fisher
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Calcium Metabolism in Bullfrog Tadpoles (Rana Catesbeiana)

Journal of Experimental Biology, 1980
ABSTRACT Non-feeding bullfrog (Rana catesbeiana) tadpoles can maintain their body Ca concentration in artificial pond waters containing a range of Ca concen-trations. The rate of uptake of 45Ca increases when the tadpoles are pre-adapted to a low-Ca pond water and declines when they are pre-adapted to high Ca.
G F, Baldwin, P J, Bentley
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Rana catesbeiana Shaw, 1802 in Italy

1987
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Albertini, Giovanni, Lanza, Benedetto
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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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Territoriality in the Bullfrog, Rana catesbeiana

Copeia, 1968
During the breeding season, adult male bullfrogs, Rana catesbeiana, establish territories from which conspecific males are aggressively excluded. Stereotyped postures, approaches, and physical encounters all function in the defense of such areas.
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