Results 151 to 160 of about 128,532 (217)

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a wide variety of vertebrates have shown that all of these enzyme types are widespread among vertebrates (Ma & Fisher, unpublished results).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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Neurohypophysial function in bullfrog (Rana catesbeiana) tadpoles

General and Comparative Endocrinology, 1970
Abstract Bullfrog tadpoles retain water when injected with vasotocin. This response is very small in young tadpoles but increases later, especially just prior to metamorphorsis. Vasotocin also increases the osmotic permeability of the skin in such tadpoles.
P J, Bentley, L, Greenwald
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Biosynthesis of pteridines in the tadpole of the bullfrog, Rana catesbeiana

Archives of Biochemistry and Biophysics, 1970
Abstract Biosynthesis of pteridines in the tadpole of the bullfrog, Rana catesbeiana, was studied with 14C-labeled compounds by an improved isolation method. It was found that little or no reduced 2-amnio-4-hydroxypteridine was converted to biopterin and a little dihydroneopterin was converted to biopterin.
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Biomechanics of vibration reception in the bullfrog,Rana catesbeiana

Journal of Comparative Physiology A, 1988
The opercularis system (OPS) of amphibians consists of an opercularis muscle that connects the shoulder girdle skeleton to the operculum, a movable element in the oval window of the otic capsule. The role of the OPS in reception of vibrations was examined in bullfrogs (Rana catesbeiana) tested in various postures that manipulated differential motion ...
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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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Metamorphosis of behavior in the bullfrog (Rana catesbeiana)

Developmental Psychobiology, 1988
AbstractThis study describes the development of different spontaneous and elicited behaviors of frogs and their relationship to morphological, physiological, and econological changes of metamorphosis. Tadpoles were studied at all stages of development from STage XVIII, the onset of metamorphosis, to Stage XXV, when metamorphosis of the froglets is ...
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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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Effects of imidacloprid on Rana catesbeiana immune and nervous system.

Chemosphere, 2017
F. Rios, T. Wilcoxen, Laura M. Zimmerman
semanticscholar   +1 more source

The Vocal Repertoire of the Bullfrog (Rana Catesbeiana)

Behaviour, 1968
Abstracti. The vocal repertoire of bullfrogs maintained in laboratory terrariums in a semi-natural environment consisted of a distinct set of stereotyped calls. Each call could be readily identified with specific patterns of behavioral activity, thus indicating the significance represented by each of these sounds. 2.
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Effects of acute exposure to the non-steroidal anti-inflammatory drug ibuprofen on the developing North American Bullfrog (Rana catesbeiana) tadpole.

Environmental Science and Technology, 2014
N. Veldhoen, R. C. Skirrow, L. Brown, G. V. van Aggelen, C. Helbing   +4 more
semanticscholar   +1 more source