Sökning: "Speciation"

Visar resultat 11 - 15 av 282 avhandlingar innehållade ordet Speciation.

1. 11. Vanadate and Peroxovanadate Complexes of Biomedical Relevance : A speciation approach with focus on diabetes

   Författare :András Gorzsás; Lage Pettersson; Carlos F. G. C. Geraldes; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Inorganic chemistry; vanadium; hydrogen peroxide; lactate; citrate; phosphate; alanyl serine; picolinic acid; speciation; formation constants; equilibrium; solution structure; potentiometry; NMR 51V; 31P; 13C; 1H ; Oorganisk kemi; Inorganic chemistry; Oorganisk kemi; oorganisk kemi; Inorganic Chemistry;

   Sammanfattning : Diabetes mellitus is one of the most threatening epidemics of modern times with rapidly increasing incidence. Vanadium and peroxovanadium compounds have been shown to exert insulin–like actions and, in contrast to insulin, are orally applicable. However, problems with side–effects and toxicity remain. LÄS MER

3. 12. Speciation genomics in Ficedula flycatchers

   Författare :Madeline Chase; Carina Mugal; Chris Jiggins; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; recombination; linked selection; selective sweeps; sex chromosomes; structural variation; birds; genome assembly; Biology with specialization in Evolutionary Genetics; Biologi med inriktning mot evolutionär genetik;

   Sammanfattning : Understanding what evolutionary processes have shaped patterns of genomic differentiation between species is a major aim of speciation genomics. However, disentangling the role of different processes that generate similar patterns remains a substantial challenge. LÄS MER

4. 13. Analysis and speciation of organic phosphorus in environmental matrices : Development of methods to improve 31P NMR analysis

   Författare :Johan Vestergren; Gröbner Gerhard; Jurgen Schleucher; Ulrik Ilstedt; Per Persson; Reiner Giesler; Benjamin L. Turner; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Phosphorus; soil; 31P NMR; NaOH EDTA; terrestrial; sulfide; speciation; bioavailability; paramagnetic; humus; boreal; tropical; multi-dimensional; agroforestry; chronosequence; fysikalisk kemi; Physical Chemistry;

   Sammanfattning : Phosphorus (P) is an essential element for life on our planet. It is central in numerous biochemical processes in terrestrial and aqueous ecosystems including food production; and it is the primary growth-limiting nutrient in some of the world’s biomes. LÄS MER

5. 14. On Speciation in Birds – Genomic Signatures across Space and Time

   Författare :Martin Stervander; MEMEG; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; colonization; islands; isolation; introgressive hybridization; sympatry; natural selection; bill morphology; coalescence-based analyses; DNA sequencing; birds; divergence; Speciation;

   Sammanfattning : The process of speciation is a cornerstone in evolutionary biology. In Darwin’s On the Origin of Species, he described how he imagined that a new species would evolve to fill an empty niche. This focus on ecology shifted with Mayr towards the importance of isolation, and for many decades the geographic modes of speciation were debated. LÄS MER

7. 15. Biodiversity in Swedish Cyprinid Fish: Insights Into Processes of Divergence

   Författare :Marnie H Demandt; Mats Björklund; Erik Petersson; Brent Emerson; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; speciation; hybridization; bottleneck; genetic drift; phylogeny; speciation rates; common bream; white bream; roach; Swedish cyprinid fish; Cyprinidae; Biology; Biologi;

   Sammanfattning : Uncovering and understanding the processes that have led to the biological diversity we observe today are of fundamental interest in biology. Since direct observation of speciation is usually impossible, knowledge about the processes behind species formation can be gathered by studying mutations, natural/sexual selection, and genetic drift. LÄS MER