The chemoreceptor surface of the taste organ in the frog Rana esculenta

1982 ◽  
Vol 224 (2) ◽  
pp. 409-420 ◽  
Author(s):  
P�l R�hlich ◽  
RaisaA. Pevzner
Keyword(s):  
Rana Esculenta ◽  
Taste Organ

Freeze-fracture characterization of cell types at the surface of the taste organ of the frog,Rana esculenta

1993 ◽  
Vol 22 (2) ◽  
pp. 118-128 ◽  
Author(s):  
A. Sbarbati ◽  
C. Zancanaro ◽  
P. Ferrara ◽  
F. Franceschini ◽  
C. Accordini ◽  
...  
Keyword(s):  
Freeze Fracture ◽  
Cell Types ◽  
Rana Esculenta ◽  
Fracture Characterization ◽  
Taste Organ

THE GAMETOKINETIC ACTIVITY OF SEROTONIN IN THE MALE OF RANA ESCULENTA

1962 ◽  
Vol 40 (3_Suppl) ◽  
pp. S146 ◽  
Author(s):  
B. Salvadori ◽  
G. Cagnazzo ◽  
G. Bernardini
Keyword(s):  
Rana Esculenta

Sur deux anomalies de la grenouille verte (Rana esculenta)

1968 ◽  
Vol 37 (7) ◽  
pp. 316-320 ◽  
Author(s):  
Alain Dubois
Keyword(s):  
Rana Esculenta

Optical Spectra of Melanin Films Extracted from Rana esculenta L.

2005 ◽  
pp. 89 ◽  
Author(s):  
G. Perna ◽  
A. Gallone ◽  
V. Capozzi ◽  
P. F. Biagi ◽  
A. Fratello ◽  
...  
Keyword(s):  
Rana Esculenta ◽  
Optical Spectra

The innervation of frog's taste organ “A histochemical study”

Life Sciences ◽  
1973 ◽  
Vol 13 (10) ◽  
pp. 1435-1449 ◽  
Author(s):  
Rodney S. DeHan ◽  
Pasquale Graziadei
Keyword(s):  
Histochemical Study ◽  
Taste Organ

Opioids and testicular activity in the frog, Rana esculenta

1993 ◽  
Vol 137 (1) ◽  
pp. 49-NP ◽  
Author(s):  
F. Facchinetti ◽  
A. R. Genazzani ◽  
M. Vallarino ◽  
M. Pestarino ◽  
A. Polzonetti-Magni ◽  
...  
Keyword(s):  
Physiological Activity ◽  
Mammalian Species ◽  
Rana Esculenta ◽  
Cell Degeneration ◽  
Efferent System ◽  
Naltrexone Treatment ◽  
Nucleus Infundibularis ◽  
The Brain

ABSTRACT The presence and activity of brain, pituitary and testicular β-endorphin (β-EP)-like material have been studied in the frog, Rana esculenta, using reverse-phase high-pressure liquid chromatography, coupled with radioimmunoassay and immunocytochemistry. In-vivo and in-vitro treatments with naltrexone were carried out to assess the putative physiological activity of opioid peptides. β(1–31) and (1–27), together with their acetylated forms, have been identified in brain, pituitary and testis. In particular, β-EP(1–31) concentrations peaked during July in the brain and pituitary, whilst in testes maximum concentrations were found in April and November. β-EP immunoreactivity was present in the brain within the nucleus preopticus and nucleus infundibularis ventralis while positive fibres in the retrochiasmatic regions projected to the median eminence. In the testis, interstitial cells, canaliculi of the efferent system, spermatogonia and spermatocytes showed positive immunostaining for β-EP. In intact animals, naltrexone treatment increased plasma and testicular androgen levels and this effect was confirmed in in-vitro incubations of minced testes. Naltrexone also induced a significant increase in germ cell degeneration. Our results indicated that an opioid system modulates the hypothalamus-pituitary-gonadal axis in the frog, Rana esculenta and, for the first time, we have shown that the testicular activity of a non-mammalian species may be regulated by opiates locally. Journal of Endocrinology (1993) 137, 49–57

Hormonal control of in vitro vitellogenin synthesis in Rana esculenta liver: Effects of mammalian and amphibian growth hormone

1992 ◽  
Vol 88 (3) ◽  
pp. 406-414 ◽  
Author(s):  
Oliana Carnevali ◽  
Gilberto Mosgoni ◽  
Kazutoshi Yamamoto ◽  
Tetsuya Kobayashi ◽  
Sakae Kikuyama ◽  
...  
Keyword(s):  
Growth Hormone ◽  
Rana Esculenta ◽  
Hormonal Control ◽  
Vitellogenin Synthesis

Freezing tolerance of the European water frogs: the good, the bad, and the ugly

2005 ◽  
Vol 288 (6) ◽  
pp. R1563-R1570 ◽  
Author(s):  
Yann Voituron ◽  
Pierre Joly ◽  
Michel Eugène ◽  
Hervé Barré
Keyword(s):  
Body Mass ◽  
Accumulation Rate ◽  
Freeze Tolerance ◽  
Rana Esculenta ◽  
Rana Ridibunda ◽  
European Water ◽  
Water Frogs ◽  
European Water Frogs ◽  
Mass Accumulation ◽  
Rana Lessonae

Survival and some physiological responses to freezing were investigated in three European water frogs ( Rana lessonae, Rana ridibunda, and their hybridogen Rana esculenta). The three species exhibited different survival times during freezing (from 10 h for R. lessonae to 20 h for R. ridibunda). The time courses of percent water frozen were similar; however, because of the huge differences in body mass among species (from 10 g for Rana lessonae to nearly 100 g for Rana ridibunda), the ice mass accumulation rate varied markedly (from 0.75 ± 0.12 to 1.43 ± 0.11 g ice/h, respectively) and was lowest in the terrestrial hibernator Rana lessonae. The hybrid Rana esculenta exhibited an intermediate response between the two parental species; furthermore, within-species correlation existed between body mass and ice mass accumulation rates, suggesting the occurrence of subpopulations in this species (0.84 ± 0.08 g ice/h for small R. esculenta and 1.78 ± 0.09 g ice/h for large ones). Biochemical analyses showed accumulation of blood glucose and lactate, liver glucose (originating from glycogen), and liver alanine in Rana lessonae and Rana esculenta but not in Rana ridibunda in response to freezing. The variation of freeze tolerance between these three closely related species could bring understanding to the physiological processes involved in the evolution of freeze tolerance in vertebrates.

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