Temporal Variation in Reproduction and Clutch Mortality of Leopard Frogs (Rana utricularia) in South Mississippi

1995 ◽  
Vol 29 (4) ◽  
pp. 614 ◽  
Author(s):  
J. Sean Doody ◽  
J. E. Young
Keyword(s):  
Temporal Variation ◽  
Leopard Frogs ◽  
Rana Utricularia

Oncogenesis and the Lucké Virus

1968 ◽  
Vol 26 ◽  
pp. 200-201
Author(s):  
A. E. Vatter ◽  
J. Zambernard
Keyword(s):  
Rna Viruses ◽  
Vegetative State ◽  
Temperature Sensitive ◽  
Structural Level ◽  
Oncogenic Viruses ◽  
Dna Viruses ◽  
Leopard Frogs ◽  
Renal Adenocarcinoma ◽  
Induced Tumors ◽  
Northern Leopard Frogs

Oncogenic viruses, like viruses in general, can be divided into two classes, those that contain deoxyribonucleic acid (DNA) and those that contain ribonucleic acid (RNA). The RNA viruses have been recovered readily from the tumors which they cause whereas, the DNA-virus induced tumors have not yielded the virus. Since DNA viruses cannot be recovered, the bulk of present day investigations have been concerned with RNA viruses.The Lucké renal adenocarcinoma is a spontaneous tumor which occurs in northern leopard frogs (Rana pipiens) and has received increased attention in recent years because of its probable viral etiology. This hypothesis was first advanced by Lucké after he observed intranuclear inclusions in some of the tumor cells. Tumors with inclusions were examined at the fine structural level by Fawcett who showed that they contained immature and mature virus˗like particles.The use of this system in the study of oncogenic tumors offers several unique features, the virus has been shown to contain DNA and it can be recovered from the tumor, also, it is temperature sensitive. This latter feature is of importance because the virus can be transformed from a latent to a vegetative state by lowering or elevating the environmental temperature.

Temporal variation in food utilisation by three species of temperate demosponge

2013 ◽  
Vol 485 ◽  
pp. 91-103 ◽  
Author(s):  
A Perea-Blázquez ◽  
SK Davy ◽  
B Magana-Rodríguez ◽  
JJ Bell
Keyword(s):  
Temporal Variation ◽  
Food Utilisation

Temporal variation in annual survival probability of the Eurasian woodcock Scolopax rusticola wintering in France

2002 ◽  
Vol 8 (1) ◽  
pp. 21-30 ◽  
Author(s):  
Giacomo Tavecchia ◽  
Roger Pradel ◽  
François Gossmann ◽  
Claudine Bastat ◽  
Yves Ferrand ◽  
...  
Keyword(s):  
Temporal Variation ◽  
Survival Probability ◽  
Annual Survival ◽  
Scolopax Rusticola
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