Effects of temperature and general anesthesia on the water gain and the inulin space of the brain of the toad, Bufo arenarum hensel

1987 ◽  
Vol 88 (2) ◽  
pp. 331-334
Author(s):  
Enrique T. Segura ◽  
Alicia Varsavsky ◽  
Silvia Petriella
Keyword(s):  
General Anesthesia ◽  
Inulin Space ◽  
Bufo Arenarum ◽  
Effects Of Temperature ◽  
Toad Bufo ◽  
The Brain ◽  
Water Gain

Prolactin binding sites in the brain and kidneys of the toad,Bufo arenarum Hensel

1985 ◽  
Vol 155 (5) ◽  
pp. 611-614 ◽  
Author(s):  
Isabel A. Lüthy ◽  
Enrique T. Segura ◽  
Viviana I. Lüthy ◽  
Eduardo H. Charreau ◽  
Ricardo S. Calandra
Keyword(s):  
Binding Sites ◽  
Bufo Arenarum ◽  
Toad Bufo ◽  
The Brain

Cardiac fibrillation in batrachia

1959 ◽  
Vol 197 (6) ◽  
pp. 1157-1160
Author(s):  
H. Mazzella
Keyword(s):  
Electric Shock ◽  
Opposite Effect ◽  
Mechanical Responses ◽  
T Wave ◽  
Mammalian Heart ◽  
Cardiac Fibrillation ◽  
High K ◽  
Bufo Arenarum ◽  
Low K ◽  
Toad Bufo

A study was made of fibrillation and its production in the heart of the toad ( Bufo arenarum). Application of a strong electric shock during the interval of the T wave, or just before, produced fibrillatory response in the ventricle. Repetitive stimuli were necessary for production of fibrillation in the auricle. Fibrillation was of a coarse type but at 37°C it occurred more readily and resembled more nearly that of the mammalian heart. At 5°C the opposite effect occurred. Perfusion of the heart with high K+ solution reduced vulnerability while in low K+ fibrillation occurred more readily. Absence of Ca++ shortened durations of induced fibrillations. Changes in mechanical responses were compared with changes in electrograms.

Active and passive chloride movements across isolated amphibian skin

1964 ◽  
Vol 207 (5) ◽  
pp. 1010-1014 ◽  
Author(s):  
José A. Zadunaisky ◽  
Felisa W. De Fisch
Keyword(s):  
Antidiuretic Hormone ◽  
Chloride Transport ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Chloride Ions ◽  
Amphibian Skin ◽  
Chloride Flux ◽  
Bufo Arenarum ◽  
Sodium Loss ◽  
Toad Bufo

Several aspects of chloride passage through isolated amphibian skin were studied. The chloride transport performed by the skin of the frog Leptodactylus ocellatus or the passive chloride fluxes observed in the skin of the toad Bufo arenarum Hensel are not affected by antidiuretic hormone. The chloride transport produces a negative potential and a short-circuit current in sodium-free solutions, though the unidirectional fluxes of chloride are greatly reduced under these conditions. The short-circuit current due to the chloride transport is smaller than the net chloride flux. It was found that this disagreement could be ascribed to a loss of sodium toward the inside from the sodium pool of the skin. Antidiuretic hormone did not affect the chloride current, nor the sodium loss from the skin. The isolated skin of the toad Bufo arenarum Hensel does not transport chloride ions. Thus the active transport of chloride observed in isolated skins of the frog Leptodactylus ocellatus does not depend on environmental conditions, since both animals live in the same surroundings.

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