Population Cytogenetics and Evolution of the Sceloporus grammicus Complex (Iguanidae) in Central Mexico

1991 ◽  
Vol 5 ◽  
pp. 79 ◽  
Author(s):  
Elisabeth Arévalo ◽  
Calvin A. Porter ◽  
Arturo González ◽  
Fernando Mendoza ◽  
José L. Camarillo ◽  
...  
Keyword(s):  
Central Mexico ◽  
Sceloporus Grammicus

Body growth in one montane population of Sceloporus grammicus (Sauria, Phrynosomatidae) in Central México

2008 ◽  
Vol 29 (1) ◽  
pp. 127-134 ◽  
Author(s):  
Fausto Méndez-de la Cruz ◽  
Orlando Cuellar ◽  
Jaime Zúñiga-Vega
Keyword(s):  
Growth Rates ◽  
Growth Pattern ◽  
Logistic Models ◽  
Body Growth ◽  
The Body ◽  
Individual Growth ◽  
Central Mexico ◽  
Lower Altitude ◽  
Sceloporus Grammicus ◽  
Region Growth

Abstract We conducted an analysis of the body growth pattern of the viviparous lizard Sceloporus grammicus in one of its montane populations in Central México. We calculated 177 individual growth rates for the period comprised between June 1991 and June 1997. Von Bertalanffy growth model provided the best fit to our data in comparison with logistic models. No intersexual differences were found in the growth pattern. The constructed growth curve estimated an age at maturity of 12 and a half months for females and 14 months for males. In spite of marked seasonality in the region, growth rates were not significantly different between seasons. Our results, together with previous studies on the growth ecology of other populations of S. grammicus, suggest that in the volcanic mountains of Central México body growth, and therefore age and size at maturity, are relatively more limited during the whole year in comparison with populations inhabiting northern or lower-altitude localities.

Ultrastructure of the effect of T-514 obtained from Karwinskia humboldtiana on assembly and integrity of yeast's peroxisomes

1991 ◽  
Vol 49 ◽  
pp. 136-137
Author(s):  
J. Sepulveda-Saavedra ◽  
I. Vander-Klei ◽  
M. Venhuis ◽  
Y. Piñeyro-Lopez
Keyword(s):  
Culture Conditions ◽  
Toxic Effects ◽  
Candida Boidinii ◽  
Central Mexico ◽  
Poisonous Plant ◽  
Biological Behaviour ◽  
Enzyme Content ◽  
Fat Deposits ◽  
Yeast Model

Karwinskia humboldtiana is a poisonous plant that grows in semi desertic areas in north and central México. It produces several substances with different toxic effects. One of them designated T-514 damages severely the lung, kidney and liver, producing in the hepatoeyte large intracellular fat deposits and necrosis. Preliminary observations demonstrated that three is a decrease in the amount of peroxisomes in the hepatocytes of experimentally intoxicated rats and monkeys. To study the effect exerted by the T-514 on peroxisomes, a yeast model was selected, thus, three species: Saccha romices cerevisiae, Ilansenula polymorpha and Candida boidinii were used, because there is information concerning their peroxisome's morphology, enzyme content, biological behaviour under different culture conditions and biogenesis.

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