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Showing 1 to 16 of 16 for “"xanthophyll"”.
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Role of xanthophyll and water-water cycles in the protection of photosynthetic apparatus in Arbutus unedo and Arabidopsis thaliana
… is the thermal energy dissipation through the xanthophyll cycle that may transform harmlessly the excitation energy into heat and thereby prevent the formation of damaging active oxygen species (AOS). Violaxanthin deepoxidase (VDE) converts violaxanthin (V) to antheraxanthin (A) and zeaxanthin …
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Ultraviolet Radiation and Carotenoid Pigmentation in Symbiotic Anthozoans
… higher diatoxanthin relative to the total xanthophyll pool [diato : (diato + diadino)] during the first 10 days of the experiment. A decrease in xanthophyll cycle activity at 20 days suggests photoadaptation of anemones to high UVA and may coincide with an increase of additional …
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Enhancement of Carotenoid Biosynthesis and Antioxidant Responses in Diatoms by Light Modulation
… <br></br><br></br> The photoprotective xanthophyll cycle, involving the pigments diatoxanthin and diadinoxanthin, is activated by light and modulated in concordance with antioxidant molecules synthesis. Indeed, under different light climates, a link between these two defense processes …
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Response of selected warm-season turfgrasses and ornamental monocots to short-term, high concentration, ozone fumigation
… an objective measure of ozone-induced injury; 3) xanthophyll cycle involvement in dissipating light energy due to increased oxidative stress; 4) the relationship of chlorophyll fluorescence coefficients, chlorophyll content, and xanthophyll cycle in the regulation and protection of photosynthesis. …
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INTERRELATIONSHIPS BETWEEN MACULAR CAROTENOIDS, RETINAL MORPHOMETRY, AND COGNITIVE FUNCTION IN PERSONS WITH MULTIPLE SCLEROSIS
… Recently, lutein and zeaxanthin, dietary xanthophylls, have been shown to be associated with cognitive health. Although xanthophylls are not recognized to be essential, their lack of endogenous de novo synthesis necessitates regular dietary consumption to derive benefits. Macular …
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Acclimation of marine macrophytes (Saccharina latissima and Zostera marina) to water flow
… and photosynthetic capacity. Changes in the xanthophyll-cycle in low-flow grown S. latissima increased non-photochemical quenching, thus reducing photodamage when photosynthesis was limited by DIC uptake. Water flow also affected root length in Z. marina but root length and below ground …
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A Study to Investigate Factors Involved in the Development of Oesophageal Carcinoma
… zinc, vitamins A, C & E, the carotenoids, and xanthophyll) were determined for patients with: Barrett's oesophagus (n=36), erosive oesophagitis (n=32) and patient controls (n=35).<br/><br/>The expression of bcl-2, bax and p53 in oesophageal tumour biopsies were ascertained by means of …
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From Cultivation to Commercialisation: The Stability, Degradation, and Interactions of Astaxanthin in Haematococcus lacustris Biomass
… product formulation. Astaxanthin is a valuable xanthophyll carotenoid and is widely considered one of the most powerful natural antioxidants. The freshwater microalga H. lacustris is regarded as the best source of natural astaxanthin and is the only source to have received direct approval for …
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From the ice to the open ocean : threats to phytoplankton productivity in the Antarctic marine ecosystem from a changing climate
… Inhibitors and pigment analyses identified xanthophyll cycling as the critical mechanism for photoprotection and preferred means by which sea ice diatoms regulated energy flow to PS1 (Publication III). While immunoblot analyses of natural communities measured minimal D1 protein breakdown in …
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Fluorescence lifetime-resolved imaging microscopy studies: quantitative image analysis, spectral-FLIM, and photosynthesis
… that there are two separate locations for xanthophyll molecules. Chapter 5 describes experiments to study the lutein-epoxide and violaxanthin cycles operating in parallel in avocado leaves. A good correlation of the fluorescence intensity and Chlorophyll a lifetimes is shown by FLIM …
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Genetic dissection of carotenoid concentration and compositional traits in maize grain
… which are collectively called di-hydroxy xanthophyll carotenoids, as well as alpha-carotene, beta-carotene and beta-cryptoxanthin, which are proVitamin A carotenoids. While phenotypic sampling and recombination across diverse maize germplasm has been successful, response to phenotypic …
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The environmental and photo-physiological control of microphytobenthos primary production on an intertidal mudflat
… pigment composition, as the photoprotectant xanthophyll diatoxanthin increased and diadinoxanthin decreased in proportion. Short-term changes incellular pigment composition induced in the laboratory were greater than seasonal pigment adaptation of microphytobenthos isolated from the field. …
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The independent and interactive influence of lutein and choline on cognitive control
… an Oddball Task to examine the impact of retinal xanthophyll accumulation (MPOD) on cognitive control. These cross-sectional analyses revealed that after controlling for sex and dietary lutein/zeaxanthin intake, higher MPOD was associated with lower N2 mean amplitude (ρ=−0.21, p=0.04) and P3 peak …
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Light energy management in peach: utilization, photoprotection , photodamage and recovery. Maximizing light absorption in orchard is not always the best solution
… carboxylative transports. While PPFD rises the xanthophyll cycle is more and more activated and the rate of non net carboxylative transports is reduced. Some of these alternative transports, such as the water-water cycle, the cyclic transport around the PSI and the glutathione-ascorbate cycle …
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Χρωματικά πρότυπα στα φύλλα : πιθανοί οικοφυσιολογικοί ρόλοι των ανθοκυάνινων, ή, Γιατί τα φύλλα γίνονται παροδικά κόκκινα
Τα φύλλα κάποιων φυτών γίνονται παροδικά κόκκινα, λόγω της συσσώρευσης ανθοκυανινών. Εξετάστηκαν δύο από τις πολλές υποθέσεις που έχουν διατυπωθεί για το ρόλο των χρωστικών αυτών στα φύλλα: ο φωτοπροστατευτικός τους ρόλος και η εμπλοκή τους στις σχέσεις φυτών και φυτοφάγων εντόμων. Χρησιμοποιήθηκαν …