Results 91 to 100 of about 3,513 (150)

Photochemical activation of Rana pipiens tyrosinase

Biochemical and Biophysical Research Communications, 1975
Abstract Purified tyrosinase from Rana pipiens is activated by light. An action spectrum for the process indicates that there are two absorption bands responsible for the activation (290nm and 334nm). The kinetics of the photochemical process show an initial activation followed by inhibition. Molecular oxygen is required.
R B, Mikkelsen, D H, Tang, E L, Triplett
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Rana pipiens pipiens Schreber

1971
One pair of medium-sized submetacentric autosomes bears a prominent secondary constriction in the long arm.
Maria Luiza Beçak, Willy Beçak, Franklin L. Roberts, Robert N. Shoffner, E. Peter Volpe, Kurt Benirschke, T. C. Hsu   +6 more
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Reflex habituation and potentiation in Rana pipiens

Animal Behaviour, 1965
Abstract This study was an attempt to further elucidate the nature of habituation. Two groups of frogs ( Rana pipiens ) were stimulated 100 times daily for 12 days with a No. 10 von Frey bristle. In one group, the locus of stimulation was maintained within the general area which elicits the wiping reflex of the ipsilateral hind foot.
D P, Kimble, R S, Ray
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Anaerobiosis in a frog, Rana pipiens

Journal of Experimental Zoology, 1967
AbstractRana pipiens shows an obvious reduction in hepatic, ventricular, and gastrocnemius muscle glycogen concentrations with increasing time in anoxia. Pulmonary repiratory movements drop sharply during the first three minutes of anoxia and virtually cease after 30 minutes.
F L, Rose, R B, Drotman
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Transplantation of nuclei between Rana pipiens and Rana sylvatica

Experimental Cell Research, 1958
Abstract 1. 1. New data are offered to show that the cleavage rates of of pip × pip, (pip) × pip, pip × syl, and (pip) × syl embryos are essentially the same. 2. 2. When a diploid Rana sylvatica blastula nucleus is transferred to an enucleated Rana pipiens ovum the resulting embryo develops only to a late blastula stage and then stops. 3.
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Experimental seizures in the frog (Rana pipiens)

Epilepsy Research, 1994
We investigated the effects of chemical convulsants in the leopard frog. Systemic kainic acid (5-20 mg/kg) caused limbic-like seizures, with staring, catatonia, fasciculations, and severe motor seizures, which were almost always lethal. Intracerebral electroencephalographic (EEG) recordings showed spike or spike-and-wave patterns at 6-8 Hz that ...
K S, Blisard, K, Fagin, P, Falivena, M D, Privitera, P, Olejniczak, D A, Harrington, K L, Taylor, O U, Scremin   +7 more
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Tuberculosis in the Leopard Frog (Rana pipiens)

The Journal of Infectious Diseases, 1970
Amphibian tuberculosis differs from the more familiar mammalian tuberculosis in that it is generally less contagious and less devastating. Although a pulmonary form of amphibian tuberculosis is known to occur, most cases are the result of ingestion of the disease-producing organisms, and the lesions appear in the liver, spleen, kidneys, and testes.
G N, Joiner, G D, Abrams
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Cell adhesion to extracellular matrix in normal Rana pipiens gastrulae and in arrested hybrid gastrulae Rana pipiens ♀ × Rana esculenta ♂

Developmental Biology, 1990
Rana pipiens eggs fertilized by Rana esculenta sperm (ESC) hybrid embryos develop until gastrulation in control Rana pipiens embryos (PIP) and then show morphogenetic arrest. After arrest, ESC do not gastrulate but live for 5 days as blastula-like embryos.
K E, Johnson, T, Darribère, J C, Boucaut   +2 more
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Competitive feeding behaviour of Rana pipiens and Rana clamitans

Animal Behaviour, 1971
Abstract Feeding hierarchies based on competition for mealworms were reliably stable over forty-five sessions in three groups of leopard frogs (Rana pipiens) and in three groups of green frogs (Rana clamitans). Green frogs most commonly wrestled during competition and were markedly more vigorous than leopard frogs.
Robert Boice, Richard C. Williams
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Hybridization Experiments Involving Rana dunni, Rana megapoda, and Rana pipiens

Copeia, 1966
BOULENGER, G. A. 1896. Descriptions of new batrachians collected by Mr. C. F. Underwood in Costa Rica. Ann. Mag. Nat. Hist., Ser. 6, 18:341-342. DUNN, E. R. 1926. The salamanders of the family Plethodontidae. Smith College 50th Anniv. Pub., Northampton, Mass. TAYLOR, E. H. 1952. The salamanders and caecilians of Costa Rica. Univ. Kans. Sci. Bull.
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