Definition, Betydelse & Synonymer | Engelska ordet XANTHOPHYLL

Definition av XANTHOPHYLL

1. (biokemi) xantofyll

Exempel på hur man kan använda XANTHOPHYLL i en mening

• Orange and yellow coloration is due to the presence of carotenoids; males possess the red carotenoid canthaxanthin and the yellow carotenoids canary xanthophyll A and B, all of which mix together to produce an orange color, while the females possess only the yellow carotenoids.
• Higher concentrations of xanthophyll pigments act as a sunscreen that protects ice algae from photodamage when they are exposed to damaging levels of ultraviolet radiation upon transition from ice to the water column during the spring.
• The name (pronounced zee-uh-zan'-thin) is derived from Zea mays (common yellow maize corn, in which zeaxanthin provides the primary yellow pigment), plus xanthos, the Greek word for "yellow" (see xanthophyll).
• In eukaryotic phototrophs, these mechanisms include non-photochemical quenching mechanisms such as the xanthophyll cycle, biochemical pathways which serve as "relief valves", structural rearrangements of the complexes in the photosynthetic apparatus, and use of antioxidant molecules.
• Flavoxanthin is a natural xanthophyll pigment with a golden-yellow color found in small quantities in a variety of plants.
• The brown colour is due to the xanthophyll, fucoxanthin which masks the colour of the other pigments, beta-carotene, chlorophyll a and c and other xanthophylls.
• Violaxanthin de-epoxidase is a part of the xanthophyll (or violaxanthin) cycle for controlling the concentration of zeaxanthin in chloroplasts.
• The brown colour of this seaweed results from the dominance of the xanthophyll fucoxanthin which masks the other pigments that are present, namely chlorophyll a, chlorophyll c, beta-carotene and other xanthophylls.

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