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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
91

Locally adapted fish populations maintain small-scale genetic differentiation despite perturbation by a catastrophic flood event

Plath, Martin, Hermann, Bernd, Schröder, Christine, Riesch, Rüdiger, Tobler, Michael, García de León, Francisco J., Schlupp, Ingo, Tiedemann, Ralph January 2010 (has links)
Background: Local adaptation to divergent environmental conditions can promote population genetic differentiation even in the absence of geographic barriers and hence, lead to speciation. Perturbations by catastrophic events, however, can distort such parapatric ecological speciation processes. Here, we asked whether an exceptionally strong flood led to homogenization of gene pools among locally adapted populations of the Atlantic molly (Poecilia mexicana, Poeciliidae) in the Cueva del Azufre system in southern Mexico, where two strong environmental selection factors (darkness within caves and/or presence of toxic H2S in sulfidic springs) drive the diversification of P. mexicana. Nine nuclear microsatellites as well as heritable female life history traits (both as a proxy for quantitative genetics and for trait divergence) were used as markers to compare genetic differentiation, genetic diversity, and especially population mixing (immigration and emigration) before and after the flood. Results: Habitat type (i.e., non-sulfidic surface, sulfidic surface, or sulfidic cave), but not geographic distance was the major predictor of genetic differentiation. Before and after the flood, each habitat type harbored a genetically distinct population. Only a weak signal of individual dislocation among ecologically divergent habitat types was uncovered (with the exception of slightly increased dislocation from the Cueva del Azufre into the sulfidic creek, El Azufre). By contrast, several lines of evidence are indicative of increased flood-induced dislocation within the same habitat type, e.g., between different cave chambers of the Cueva del Azufre. Conclusions: The virtual absence of individual dislocation among ecologically different habitat types indicates strong natural selection against migrants. Thus, our current study exemplifies that ecological speciation in this and other systems, in which extreme environmental factors drive speciation, may be little affected by temporary perturbations, as adaptations to physico-chemical stressors may directly affect the survival probability in divergent habitat types.
92

Nervous control of liver metabolism and hemodynamics

Gardemann, Andreas, Püschel, Gerhard, Jungermann, Kurt January 1992 (has links)
Content: Anatomy of hepatic innervation In vivo studies on the role of hepatic nerves Effects of hepatic nerves in isolated perfused liver Mechanism of action of sympathetic hepatic nerves
93

Characterization of DNA binding properties of two nuclear proteins from brain

Raghunathan, A 07 1900 (has links)
DNA binding properties
94

Metabolism of arachidonic acid via the lipoxygenase pathway in sheep uterus

Surapureddi, Sailesh 11 1900 (has links)
Lipoxygenase pathway in sheep uterus
95

Development of aneuploids of Pennisetum glauhum (L)R.Br as a base for high density chromosome mapping

Chirumamille, Nagesh 12 1900 (has links)
Pennisetum glauhum (L)R.Br as a base for high density chromosome mapping
96

Isolation and characterization of nuclear matrix proteins from brain cell types: Possible utility in cancer cell lines

Raju, Nivarthi Naga 08 1900 (has links)
Isolation and characterization of nuclear matrix proteins
97

Studies on neurotransmitter function of acetylcholine in experimental hyperammonemia

Devi, Rukmini R P 05 1900 (has links)
Studies on neurotransmitter function
98

Studies on diazotrophy and its regulation by salinity stress and osmotic stress in the cyanobacterium nostoc muscorum

Devulapalli, Chakravarthy January 1996 (has links)
Studies on diazotrophy and its regulation
99

Studies on the interaction between glutathione and hypothalamic peptide hormones in the rat brain

Pasha, Vali K 05 1900 (has links)
Interaction between glutathione and hypothalamic peptide hormones in the rat brain
100

Regulation of aerobic hydrogen metabolism in diazotrophic cyanobacteria

Kumar, Pratap A 09 1900 (has links)
Regulation of aerobic hydrogen metabolism

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