Search for dissertations about: "Perennial"
Showing result 21 - 25 of 106 swedish dissertations containing the word Perennial.
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21. Molecular analysis of growth cessation and dormancy in hybrid aspen
Abstract : Perennial plants such as trees living in temperate zones experience extreme changes in temperature during summers and winters. In order to survive, shoot apical and cambial meristem undergo a transition from active growth to dormant state, well in advance of winter onset. READ MORE
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22. Refugee Entrepreneurship : Towards a Nuanced Understanding of the Phenomenon
Abstract : Forced cross-border migration and entrepreneurship have persisted as perennial themes throughout the annals of human history. However, the recent ‘refugee crisis’ has sparked a resurgence of interest in their interplay under the rubric of ‘refugee entrepreneurship’. READ MORE
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23. Diversifying crop rotations for sustainable production and climate change adaptation
Abstract : Industrial cropping systems are increasingly simplified, with fewer crops being grown, requiring extensive use of inputs, and contributing to environmental pollution and climate change. Solutions are needed to reduce the negative effects, while retaining productivity in the face of increasingly frequent detrimental climatic conditions. READ MORE
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24. Palynology of Hypochoeridinae and Scolyminae (Compositae)
Abstract : Pollen grains of 35 species representing all 7 genera of the subtribe Hypochoeridinae, and Scolymus hispanicus of the subtribe Scolyminae were examined by LM, SEM and TEM. The pollen grains of annual species are usually smaller than those of perennial ones. The Hypochoeridinae possesses essentially tricolpororate,echinolophate pollen grains. READ MORE
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25. Geographic Variation, Hybridization and Evolution in the Bladder Campions, Silene vulgaris and S. uniflora (Caryophyllaceae)
Abstract : In the present thesis, I investigated the inter- and intraspecific variation in the Silene vulgaris/uniflora species-complex (the bladder campions). I have focused on the effects of past and present hybridization both on a large scale ? over the whole of Europe ? and on a local scale. Silene vulgaris and S. READ MORE