Results 141 to 150 of about 128,532 (217)

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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Physiological color change in the bullfrog,Rana catesbeiana

Journal of Experimental Zoology, 1999
Adults of Rana catesbeiana maintained for 4 days in 12:12 light/dark regimen exhibited a rhythmic color change of 24 hr. Under constant light, however, the rhythm disappeared, and the reflectance values gradually became greater, that is the animals became lighter.
C R, Camargo, M A, Visconti, A M, Castrucci   +2 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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Heterogeneity in the liver mitochondria of the tadpole, Rana catesbeiana

Comparative Biochemistry and Physiology Part B: Comparative Biochemistry, 1982
1. The heterogeneity of liver mitochondria of the tadpoles, Rana catesbeiana, undergoing metamorphosis was investigated by a combination of pulse-chase labeling of mitochondria with [methyl-3H]thymidine and centrifugation of mitochondria on a density gradient of metrizamide. 2.
Y, Goto, N, Amuro, Y, Ohki, R, Shukuya
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Chemical structure of angiotensin in the bullfrog Rana catesbeiana

General and Comparative Endocrinology, 1983
Crude bullfrog angiotensin was prepared by modified Boucher's procedures. The kidney extract was incubated in vitro with homologous plasma. Crude angiotension, 15 micrograms equivalent to [Asp1, Ile5]angiotensin II in rat vasopressor assay, was purified further by three steps by SEP-PAK C18 cartridge, SP-Sephadex column chromatography, and high ...
Y, Hasegawa, T X, Watanabe, H, Sokabe, T, Nakajima   +3 more
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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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Oxygen uptake in bullfrog tadpoles (Rana catesbeiana)

The Journal of Experimental Zoology, 1998
Weight-specific rates of aquatic oxygen consumption (VO2, microliter O2 g-1 h-1) at 23 degrees C were determined for water-breathing (e.g., forcibly submerged) bullfrog tadpoles as functions of stage of development and O2 tension (PO2). The VO2 at an O2 tension near that of air-saturated water (PO2 approximately 154 mmHg) was independent of stage of ...
W C, Crowder, M, Nie, G R, Ultsch
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The cerebellum of the bullfrog tadpole (Rana catesbeiana)

Journal of Comparative Neurology, 1977
AbstractThe cerebellum of the premetamorphic bullfrog tadpole differs from the cerebellum of other frog species in its morphology and maturational state. The cell mass beneath the floor of the lateral recess and bordering its lateral wall that has been reported to form the auricular lobe in other species is absent, the auricular lobe abutting the ...
N J, Uray, A G, Gona
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Nystatin studies of the skin of larval Rana catesbeiana

American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 1983
Transport and electrical characteristics of the isolated skin of larval Rana catesbeiana were analyzed using ion substitution and nystatin. When the inner (IBS) and outer (OBS) bathing solutions contained Na Ringer solution the electrical potential (TEP), short-circuit current (SCC), and resistance (R2) were 23.5 +/- 7.0 mV, 2.8 +/- 0.7 microA . cm-2,
T C, Cox, R H, Alvarado
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The green rod pigment of the bullfrog. Rana catesbeiana

Vision Research, 1984
The blue-sensitive pigment of the green rods was purified by column chromatography with Con A-Sepharose 4B. In digitonin solution, the lambda max and the epsilon max values of the green rod pigment were 430 nm and 35,000, respectively, for the vitamin A1-based pigment (P-4301).
M, Makino-Tasaka, T, Suzuki
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