The effects of the bleaching herbicide amitrole on the carotenoid composition and ultrastructure were studied du­ ring the transformation of chloroplasts into chromoplasts in the tulip tree (Liriodendron tulipifera L.). Amitrole inhi­ bited the accumulation of (3-carotene and of an unidentified carotene. The biosynthesis of xanthophylls was similar to that in the control. Amitrole caused the ap...

Herbicidal Action of Monuron, Light, Oxygen, Singlet Oxygen, Plant Pigments Monuron treatment of detached flax cotyledons caused a rapid inhibition of C 02 fixation in darkness and light. Chlorophyll breakdown was promoted by increased light intensity. Ethane generation, an indicator of membrane damage, increased as the chlorophyll level decreased. The carotene pigments were destroyed more rapi...

Carotenoids, Chlorella fusca, Chlorophylls, Iron Stress, Vanadate The pigment composition of Chlorella fusca has been investigated in the absence and in presence of vanadate and during iron stress. 1. Fe-deficiency generally decreases algal pigment content without change of the ratio chloro­ phyll a/b. 2. A twofold vanadate induced increase of the chlorophylls is accompanied by a similar enhanc...

Algae taxa are notably diverse regarding pigment diversity and composition, red seaweeds (Rhodophyta) being a valuable source of phycobiliproteins (phycoerythrins, phycocyanin, allophycocyanin), carotenes (carotenoids xanthophylls), chlorophyll a. These pigments have considerable biotechnological potential, which has been translated into several registered patents commercial applications. Howev...

OBJECTIVE Observational epidemiologic studies have shown that a high intake of dietary and high serum levels of carotenoids are associated with a reduced risk of mortality from cancer and cardiovascular disease. To investigate whether high serum levels of carotenoids can reduce mortality rates, a population-based follow-up study was conducted among Japanese inhabitants. MATERIALS AND METHODS ...

PURPOSE Lutein and zeaxanthin are macular pigments with a protective function in the retina. These xanthophylls must be obtained from the diet or added to foods or supplements via easy-to-use, stable formulations. The technique employed to produce these formulations may affect the bioavailability of the xanthophylls. METHODS Forty-eight healthy volunteers were randomized into this double-blin...