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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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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.
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Showing 1 to 10 of 12 (0.014 seconds)| 1 |
Expression and Function of Mouse Pelota GeneSallam, Mahmoud 07 February 2002 (has links)
No description available.
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Population structure and genetic diversity of Worthen's sparrow (Spizella wortheni) in northeastern MexicoCanales Delgadillo, Julio Cesar 23 August 2011 (has links)
The development of genetic tools to study populations at the molecular level has been one of the most important contributions to understand demographic processes in wild populations of conservation concern. Habitat loss and habitat fragmentation are the main factors causing declines of birds populations, as in the case of the Worthen’s sparrow (Spizella wortheni), a Mexican endemic Emberizid restricted to scrub and grassland habitats in northeastern Mexico.
Here, I present the first molecular tools developed specifically for the study of S. wortheni populations. Genetic analyses of seven remnant populations of S. wortheni showed that no genetic impoverishment is present. This unexpected result may be caused by the nomadic life style of S. wortheni, which makes it tolerant to habitat modification. The high levels of inbreeding I found can be attributed to the tendency of S. wortheni to move in gregarious groups, since non-random mating might be present.
My analyses based on the study of DNA segments from five mitochondrial genes support the hypotheses that S. wortheni and S. pusilla (Field Sparrow), as well as S. breweri (Brewer’s Sparrow) and S. passerina (Chipping Sparrow) are sister taxa. A phylogenetic network analysis showed that conflicting relationships among Spizella species might be caused by possible hybridization events between ancestors of extant taxa.
Based on the study of the phylogenetic community structure, patterns of phylogenetic attraction and repulsion, and on the estimation of marginality, specialization and niche overlap among species, I investigated the possible causes of rarity in S. wortheni. The phylogenetic community structure analysis suggested that Spizella species are clustered across vegetation communities. Assuming phylogenetically conserved ecological traits, the phylogenetically clumped distribution may indicate habitat filtering among Spizella species. Additionally, behavioral traits such as flocking in mixed-species flocks might contribute to explain the pattern of community structure I found, and suggest that the rarity of S. wortheni is not a matter of interspecific competition. According to the phylogeny, evolutionary age was also discarded as a cause of rarity of this species. Compared with its congenerics, S. wortheni is the most specialized of all Spizella species. A potential evolutionary change of S. wortheni behavior that results in niche specialization is more likely to be the cause of its rarity.
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Functional Analysis of Insl5 and Insl6 Genes and Verification of Interactions between Pelota and its Putative Interacting Proteins. / Funktionelle Analyse der Insl5- und Insl6-Gene und Bestätigung der Interaktion von Pelota und dessen putativen Interaktionspartnern.Burnicka-Turek, Ozanna 02 July 2009 (has links)
No description available.
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The role of bHLH transcription factor NEX in neuronal differentiation and experience-dependent plasticity / Die Funktion von NEX während der neuronalen Differenzierung und der adulten Gehirn PlastizitätMikhailova, Olga 15 January 2008 (has links)
No description available.
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Funktionelle Analyse des keimzellspezifischen Gens ADAM 27 / Functional analysis of germ cell specific gene ADAM 27Baldauf, Christian 11 July 2011 (has links)
No description available.
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Pioneering studies on the gene order, DNA sequence and evolution of the MHC class I region in the new world primate Callthrix jacchus / Pionieruntersuchungen der Gen-Reihenfolge, DNA-Sequenz und Evolution der MHC-Klasse-I-Region in Neue-Welt-Primaten Callithrix jacchusMesa Herrera, Natalia Regina 05 July 2007 (has links)
No description available.
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A Whole Genome Scanning for QTL Affecting Leg Weakness and Its Related Traits in a White Duroc × Erhualian Resource Population / Genomweite QTL Typisierung für Fundamentqualität beim Schwein in einer Weiße Duroc x Erhualian KreuzungspopulationGuo, Yuanmei 19 January 2009 (has links)
No description available.
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The contribution of N-terminally modified amyloid beta to the etiology of Alzheimer's diseaseWittnam, Jessica L. 21 May 2012 (has links)
No description available.
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Deciphering the genetics of pig complex traits through QTL mapping and positional candidate cloing / Entschlüsselung von komplexen Merkmalen beim Schwein unter Verwendung von QTL Kartierung und Kandidatengen-KlonierungDing, Nengshui 26 January 2007 (has links)
No description available.
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Genomic Prediction for Quantitative Traits: Using Kernel Methods and Whole Genome Sequence Based Approaches / Genomische Vorhersage für quantitative Merkmale: Verwendung von Kernel-Methoden und Verfahren, die auf vollständigen Genomsequenzen basierenOber, Ulrike 28 September 2012 (has links)
No description available.
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