Sökning: "xanthophylls"
Hittade 4 avhandlingar innehållade ordet xanthophylls.
1. The photophysics and functions of some naturally occurring carotenoids
Sammanfattning : Carotenoids are one of the most widespread and important group of pigments in Nature and they can act as light-harvesting agents, photoprotectors and antioxidants. Mechanisms of their multiple functions are not fully understood mainly because their complicated photophysics involving ?dark? excited states. LÄS MER
2. Anti-cancer effects of bioactive compounds from rose hip fruit in human breast cancer cell lines : carotenoids, triterpenes, and ascorbate evaluated singly or in combination
Sammanfattning : Rose hips have long been used in human diets as a food ingredient and supplement. Their multiple medical properties, which have been attributed to their abundant carotenoid composition, have attracted widespread scientific attention. This thesis examined the carotenoid composition in rose hips from five rose species. LÄS MER
3. Xanthophyll Cycle in the Light of Thylakoid Membrane Lipids - Membrane Packing, Curvature Elastic Stress and Enzyme Binding
Sammanfattning : The xanthophyll cycle involves the light-dependent and reversible conversion of violaxanthin to zeaxanthin. The enzyme, violaxanthin de-epoxidase (VDE) catalyses the conversion of violaxanthin to zeaxanthin, via the intermediate antheraxanthin. VDE is a membrane-hosted enzyme during its activity. LÄS MER
4. The significance of feedback de-excitation
Sammanfattning : During photosynthesis sunlight is absorbed by photosynthetic pigments and converted into organic compounds, such as carbohydrates. Photosynthesis needs to be highly regulated, since both too much and too little light are harmful to plant. LÄS MER