Search for dissertations about: "introns"

Showing result 21 - 25 of 61 swedish dissertations containing the word introns.

2. 21. Phylogeny and species delimitation in Roccellaceae and Physciaceae (Euascomycetes)

   Author : Katileena Lohtander; Mats Wedin; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Systematics and phylogenetics; Systematik och fylogeni; systematisk botanik; Systematic Botany;

   Abstract : DNA sequence data (the ITS region and Group I Introns) from the nuclear ribosomal repeat (rDNA), partial β-tubulin gene sequences, RAPD markers, and some morphological characters were analysed phylogenetically in order to examine relationships in lichenized Euascomycetes, from the species level to higher taxonomic levels. The species level studies comprise some so-called species pairs in two families, Roccellaceae (Arthoniales) and Physciaceae (Lecanorales). READ MORE

4. 22. The Effects of Mutation and Selection on the Rate and Pattern of Molecular Evolution in Birds

   Author : Sofia Berlin; Hans Ellegren; Adam Eyre-Walker; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Molecular genetics; substitution rate; diversity; selection; male mutation bias; birds; Genetik; Genetics; Genetik;

   Abstract : By comparing sequence diversity and divergence on sex chromosomes one can study how the rate of evolution in affected by mutation and/or selection. The rate of mutation in male biased, meaning that relatively more mutations are created in the male germ line than in the female. READ MORE

5. 23. Disentangling the Reticulate History of Polyploids in Silene (Caryophyllaceae)

   Author : Magnus Popp; Bengt Oxelman; Magnus Lidén; Jeff J. Doyle; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biology; Silene; Sileneae; polyploidy; low copy nuclear DNA; RNA polymerase; RPA2; RPB2; RPD2; internal transcribed spacer; rps16; psbE-petL; concerted evolution; reticulate evolution; lineage sorting; Biologi; Biology; Biologi;

   Abstract : DNA sequences from the rps16 intron and the psbE-petL spacer from the chloroplast genome, the ribosomal nuclear ITS region, and introns from the low copy nuclear genes RPA2, RPB2, RPD2a and RPD2b, are in different combinations used to infer phylogenetic relationships in Sileneae (Caryophyllaceae). Used in concert, the biparentally inherited nuclear regions are useful to distinguish between paralogy due to allopolyploidy and single gene duplications, respectively, because the latter are not expected to give rise to repeated phylogenetic patterns in potentially unlinked sequence regions. READ MORE

6. 24. Regulation of Adenoviral Gene Expression by the L4-33K and L4-22K Proteins

   Author : Ellenor Backström; Göran Akusjärvi; Francoise Raffalli-Mathieu; Uppsala universitet; []
   Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Virology; Virologi; Medical Virology; Medicinsk virologi;

   Abstract : The splicing pattern during an adenovirus infection is shifted at the late phase towards using weaker splice sites, splicing out larger introns. Splicing of weak 3´ splice sites usually requires recognition of the 3´AG dinucleotide before the first catalytic step of splicing. READ MORE

7. 25. Transcription Factor AP-2 in Relation to Personality and Antidepressant Drugs

   Author : Cecilia Berggård; Lars Oreland; Göran Engberg; Uppsala universitet; []
   Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Pharmacology; Transcription factors; serotonin; AP-2; antidepressants; CNS; personality; Farmakologi; Pharmacological research; Farmakologisk forskning;

   Abstract : The CNS monoaminergic systems are considered as the head engine regulating neuropsychiatric functions and personality. Transcription factor AP-2 is known to be essential for the development of the brainstem including the monoaminergic nuclei, and has the ability to regulate many genes in the monoaminergic systems. READ MORE