Global ETD Search

21	Age and Sex-Specific Effect of Caloric Restriction on Circadian Clock and Longevity-Associated Gene Expression Astafev, Artem Andreyevich 20 October 2017 (has links) No description available. Biology Molecular Biology caloric restriction calorie restriction CR circadian clock circadian rhythms aging sexual dimorphism sex-specific sex-dependent short-term CR long-term CR dietary restriction diet longevity gene expression metabolism feeding regimen
22	Diet quality impairs male and female reproductive performance and affects the opportunity for selection in an insect model Winkler, Lennart, Janicke, Tim 19 April 2024 (has links) Environmental factors can have profound effects on the strength and direction of selection and recent studies suggest that such environment-dependent selection can be sex-specific. Sexual selection theory predicts that male fitness is more condition dependent compared to female fitness, suggesting that male fitness is more sensitive to environmental stress. However, our knowledge about the effect of environmental factors on sex-specific reproductive performance and on sex differences in the opportunity for selection is still very limited. In the present study, we investigated the sex-specific effects of diet quality (yeast deprivation and flour type) in the red flour beetle Tribolium castaneum. Specifically, we manipulated yeast supplementation in wheat and whole-wheat flour in competition assays allowing us to test for sex-specific effects of food quality (i) on reproductive success and (ii) on the opportunity for selection. Our data show that yeast deprivation in wheat flour had significantly negative effects on body mass and reproductive success of both sexes, while high-quality flour (whole-wheat flour) was able to buffer the negative impact to a large extent. Importantly, our data suggest no sex-specific effect of dietary stress on reproductive success because the magnitude of the negative effect of yeast deprivation was similar for males and females. Moreover, our study demonstrates that low food quality inflated the opportunity for selection and did not differ between sexes neither under benign nor stressful dietary conditions. We discuss the implications of our findings for the adaptation to stressful environments. info:eu-repo/classification/ddc/570 ddc:570 info:eu-repo/classification/ddc/500 ddc:500
23	Examining the maintaining factors of anorexia nervosa Aberdeen, Petrina 15 August 2013 (has links) This thesis is a qualitative investigation of the factors which maintain anorexia nervosa (AN) according to the transdiagnostic theory of eating disorders (Fairburn et al., 2003). AN is difficult to treat and continues to evade complete understanding. The present study aimed to promote further understanding of food restriction and physical activity in relation to the constructs of clinical perfectionism, core low self-esteem, mood intolerance, and interpersonal difficulties. Twenty females with self-reported AN were recruited from Guelph, Ontario and participated in semi-structured interviews. Thematic analysis revealed eight major themes for clinical perfectionism, five for core low self-esteem, five for mood intolerance, and six for interpersonal difficulties. The in-depth emotional accounts and details of food restriction and physical activity in relation to the four constructs examined in this study may contribute to further appreciation of AN, informing practitioners and family members, promoting empathy, and improving treatment options. anorexia nervosa eating disorders maintaining factors of anorexia nervosa qualitative research physical activity food restriction clinical perfectionism perfectionism low self-esteem self-esteem core low self-esteem mood intolerance mood emotions interpersonal difficulties relationships theory theoretical frameworks eating disorder theory semi-structured interviews thematic analysis eating habits dietary restriction restrained eating exercise intensity of physical activity frequency of physical activity types of physical activity food choices dietary restraint

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