Sökning: "vascular plant"

Visar resultat 21 - 25 av 76 avhandlingar innehållade orden vascular plant.

1. 21. Effects of herbivory on arctic and alpine vegetation

   Författare :Åsa Lindgren; Ove Eriksson; Jon Moen; Anders Angerbjörn; Ingibjörg S Jónsdóttir; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; herbivory; reindeer; rodents; functional traits; plant species composition; arctic; alpine; tundra; seed limitation; Carex bigelowii; Biology; Biologi; Plant Ecology; växtekologi;

   Sammanfattning : The distribution of plant species and functional traits in alpine and arctic environments are determined by abiotic conditions, but also by biotic interactions. In this thesis, I investigate interactions among plants and herbivory effects on plant community composition and plant functional traits in three different regions: Swedish Lapland, Beringia (USA/Russia) and Finnmark (Norway). LÄS MER

3. 22. Semi-natural meadows in southern Sweden - changes over time and the relationship between nitrogen supply and management

   Författare :Gudrun A I Berlin; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Plant community dynamic; Nitrogen; Mowing; Meadows; Management; Long-term study; Landscape changes; Field experiment; Community diversity; Fertilisation; Species changes; Species turnover; Plant ecology; Växtekologi;

   Sammanfattning : In this thesis, I have studied continuously managed semi-natural meadows in south-central Sweden. The purpose was 1) to make a survey of meadow vegetation in the region 2) to compare two investigations of the vegetation, one from 1963-1966 and one from 1990 3) to investigate experimentally in the field how increased nitrogen supply rate as well as changed management intensity effects the nitrogen economy and species richness in two meadow communities. LÄS MER

4. 23. Changes in plant community diversity and management effects in semi-natural meadows in southern Sweden

   Författare :Anna-Carin Linusson; Biologiska institutionen; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Plant ecology; Vegetation; Species diversity; Management intensity; Community diversity; Ordination; Växtekologi;

   Sammanfattning : The objectives of this thesis were to: 1) survey the vegetation in semi-natural meadows in south-central Sweden, 2) discern meadow vegetation changes in eight semi-permanent plots between studies performed in the 1960s and in 1990, 3) experimentally investigate the effects of variations in management intensity in one dry and one mesic meadow, 4) experimentally investigate the effects of different management practices or absence of management on species dynamics in meadow vegetation. 1. LÄS MER

5. 24. Plant-Derived Substances and Cardiovascular Diseases : Effects of Flavonoids, Terpenes and Sterols on Angiotensin-Converting Enzyme and Nitric Oxide

   Författare :Ingrid Persson; Rolf G.G. Andersson; Lars Bohlin; Linköpings universitet; []
   Nyckelord :MEDICINE; MEDICIN;

   Sammanfattning : Diet has for many years been known to play a key role in the development of chronic diseases. There are clear associations between consumption of vegetables, fruits and berries, and risk of cardiovascular diseases, the number one cause of death in the world. LÄS MER

7. 25. In vitro and in vivo approaches in the characterization of XTH gene products

   Författare :Nomchit Kaewthai; Harry Brumer; Jocelyn Rose; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Arabiodopsis thaliana; Hordeum vulgare; plant cell wall; xyloglucan; glycoside hydrolase family 16; xyloglucan endo-transglycosylase hydrolase gene family; xyloglucan endo-hydrolase; heterologous protein expression; Pichia pastoris; T-DNA insertion; in situ XET XEH assay; high-througput screening; Plant physiology; Växtfysiologi; Biochemistry; Biokemi; Functional genomics; Funktionsgenomik; SRA - Molecular Bioscience; SRA - Molekylär biovetenskap;

   Sammanfattning : ABSTRACT The xyloglucan endo-transglycosylase/hydrolase (XTH) genes are found in all vascular and some nonvascular plants. The XTH genes encode proteins which comprise a subfamily of glycoside hydrolase (GH) family 16 in the Carbohydrate-Active enZYmes (CAZY) classification. LÄS MER