Adaptation of malate dehydrogenase to environmental temperature variability in two populations of Potentilla glandulosa Lindl.

Oecologia ◽  
1978 ◽  
Vol 34 (2) ◽  
pp. 133-141 ◽  
Author(s):  
J. A. Terri ◽  
M. M. Peet
Keyword(s):  
Malate Dehydrogenase ◽  
Environmental Temperature ◽  
Temperature Variability ◽  
Two Populations

Respiratory metabolism studies on red-winged blackbird nestlings

1968 ◽  
Vol 46 (2) ◽  
pp. 223-233 ◽  
Author(s):  
M. I. Dyer
Keyword(s):  
Oxygen Consumption ◽  
Body Temperature ◽  
Temperature Gradient ◽  
Respiratory Quotient ◽  
Environmental Temperature ◽  
Metabolic Response ◽  
Respiratory Metabolism ◽  
Nestling Period ◽  
Metabolic Reactions ◽  
Two Populations

Nestling red-winged blackbirds exhibited two distinct metabolic reactions to lowering temperatures. One group, which maintained homeothermic conditions, elevated its metabolism linearly according to a drop in ambient temperature and the second decreased its metabolic response in a curvilinear fashion. Core temperatures showed that although there was a progression toward the establishment of homeothermy throughout the nestling period, the birds could and did drop their core temperatures when the temperature gradient was too great to maintain constant body temperature. In some instances it is felt that oxygen consumption, and thus metabolism, was lowered before body temperature was suddenly dropped. No differences in the rates of metabolism could be found between upland and marshland populations; however, differences between values of the respiratory quotient for the two populations were found (p < 0.001). In addition differences in R.Q. values were found between well-developed nestlings practicing homeothermy and those that became hypothermic in response to lowering environmental temperature.

Comparison of Principal Component Solutions in Two Populations

Methodology ◽  
2016 ◽  
Vol 12 (1) ◽  
pp. 11-20 ◽  
Author(s):  
Gregor Sočan
Keyword(s):  
Simulation Study ◽  
Principal Components ◽  
Common Factor ◽  
Principal Component ◽  
Component Model ◽  
Bootstrap Procedure ◽  
Factor Loadings ◽  
Component Loadings ◽  
Principal Component Model ◽  
Two Populations

Abstract. When principal component solutions are compared across two groups, a question arises whether the extracted components have the same interpretation in both populations. The problem can be approached by testing null hypotheses stating that the congruence coefficients between pairs of vectors of component loadings are equal to 1. Chan, Leung, Chan, Ho, and Yung (1999) proposed a bootstrap procedure for testing the hypothesis of perfect congruence between vectors of common factor loadings. We demonstrate that the procedure by Chan et al. is both theoretically and empirically inadequate for the application on principal components. We propose a modification of their procedure, which constructs the resampling space according to the characteristics of the principal component model. The results of a simulation study show satisfactory empirical properties of the modified procedure.

Light-activation of NADP-malate dehydrogenase: A highly controlled process for an optimized function

2000 ◽  
Vol 110 (3) ◽  
pp. 322-329 ◽  
Author(s):  
M. Miginiac-Maslow ◽  
K. Johansson ◽  
E. Ruelland ◽  
E. Issakidis-Bourguet ◽  
I. Schepens ◽  
...  
Keyword(s):  
Malate Dehydrogenase ◽  
Light Activation
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