Search for dissertations about: "Perennial"

Showing result 1 - 5 of 106 swedish dissertations containing the word Perennial.

  2. 1. Population dynamics of the perennial weed species Sonchus arvensis L

    Author : Saghi Anbari; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : Sonchus arvensis L. is a perennial weed that is widely prevalent in annual crops in northern Europe and can cause substantial yield losses. The abundance of S. arvensis has increased recently, primarily due to expansion of organic farming and increased use of reduced tillage. READ MORE

  4. 2. IgE sensitization against food allergens : Natural history, relation to airway inflammation and asthma

    Author : Antonios Patelis; Andrei Malinovschi; Eva Rönmark; Uppsala universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; allergen components; extract-based; exhaled NO; airway hyperresponsiveness; blood eosinophil count; IgE sensitization; food hypersensitivity; food allergens; perennial allergens; natural history; markers of systemic inflammation; markers of local inflammation; Lungmedicin; Lung Medicine; Fysiologi; Physiology; Immunologi; Immunology;

    Abstract : Background: According to recent studies in children, IgE sensitization not only against perennial allergens, but also against food allergens, is related to asthma risk and increased airway inflammation. During the last decade, a new technique for IgE determination based on allergen components has become available, but its use in epidemiological studies has been limited. READ MORE

  5. 3. Ecological and Evolutionary Consequences of Herbivory in the Perennial Herb Lythrum salicaria

    Author : Lina Lehndal; Jon Ågren; Peter Hambäck; Marc Johnson; Uppsala universitet; []
    Keywords : Disturbance gradient; Female reproductive success; Galerucella calmariensis; Galerucella pusilla; Herbivore removal; Latitudinal gradient; Local adaptation; Nanophyes marmoratus; Plant-herbivore interactions; Plant size; Resistance to herbivory; Tolerance to damage; Biology with specialization in Ecological Botany; Biologi med inriktning mot ekologisk botanik;

    Abstract : In this thesis, I combined field, common-garden and greenhouse experiments to examine the ecological and evolutionary consequences of plant-herbivore interactions in the perennial herb Lythrum salicaria. More specifically I examined (1) whether resistance and tolerance to damage from herbivores vary with latitude and are positively related to the intensity of herbivory in natural populations, (2) whether effects of herbivory on plant fitness vary with latitude, (3) whether populations are locally adapted and whether herbivory influences the relative fitness of populations, and (4) whether the intensity and effects of insect herbivory on reproductive output vary locally along a disturbance gradient and are associated with differences in plant resistance. READ MORE

  6. 4. Population dynamics of a perennial herb (Plantago maritima L.) along a distributional gradient : a demographical study

    Author : Lenn Jerling; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Populationsekologi; Grobladsväxter;

    Abstract : In order to explain density distribution and provide the basis for further research on life history phenomena, the demography of Plantago maritima is described along a distributional gradient from mean water level to the epilitoral. The results seem to suggest that the factors affecting distribution are differences in 1. READ MORE

  7. 5. Prospects for Bioenergy in Europe - Supply, Demand and Trade

    Author : Karin Ericsson; Miljö- och energisystem; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Energiforskning; Energy research; biofuel trade; perennial energy crops; co-firing; bioenergy policy; biomass production cost; potential biomass supply; Bioenergy; Europe;

    Abstract : Renewable energy sources (RES), such as biomass, can be used to address two important issues in Europe: climate change and energy security. If biomass is produced sustainably and used efficiently, bioenergy contributes very little to CO2 emissions. READ MORE