نتایج جستجو برای: β carotene
تعداد نتایج: 181486 فیلتر نتایج به سال:
An increased intake of fruits and vegetables has been shown to be associated with reduced risk of cancer. In epidemiological studies, supplements of β-carotene, which is abundant in fruits and vegetables, were not found to be beneficial in reducing the incidence of lung cancer in high-risk groups. Epoxycarotenoids are abundant in nature. 5,6-Epoxy-β-carotene was much more active than β-carotene...
A strategy to reduce the incidence of vitamin A deficiency is to improve precursor bioavailability from meals. Since vitamin A precursors are fat-soluble, we noted that carotenoids are more easily absorbed from food if prepared in such a way that the food matrix containing provitamin A (β-carotene) is sufficiently fat rich. To quantify this effect, we have developed a stable isotope methodology...
The halotolerant microalga Dunaliella salina has been widely studied for natural 10 β-carotene production. This work shows biochemical characterization of three newly isolated 11 Dunaliella salina strains DF15, DF17 and DF40 compared with D. salina CCAP 19/30 (confirmed to 12 be D. tertiolecta) and D. salina UTEX 2538 (also known as D. bardawil). Although all three new strains 13 have been gene...
Most Sphingomonas species synthesize the yellow carotenoid nostoxanthin. However, the carotenoid biosynthetic pathway of these species remains unclear. In this study, we cloned and characterized a carotenoid biosynthesis gene cluster containing four carotenogenic genes (crtG, crtY, crtI and crtB) and a β-carotene hydroxylase gene (crtZ) located outside the cluster, from the gellan-gum producing...
1 of 2 DESCRIPTION A 30-month-old boy presented with yellowish discolouration of the nose ( fi gure 1 ), for 4 months. He was born prematurely at 32 weeks gestation with atrial and ventricular septal defects; both repaired in March 2009. Also has asthma and gastro-oesophageal refl ux. He is on erythromycin 16 mg four times a day, omeprazole 5 mg once daily, fl exitide 50 2 puffs twice daily, ph...
BACKGROUND Epidemiologic studies examining associations between carotenoid intakes and risk of breast cancer by estrogen receptor (ER) and progesterone receptor (PR) status are limited. OBJECTIVE We investigated these associations in a pooled analysis of 18 cohort studies. DESIGN Of 1,028,438 participants followed for a maximum follow-up of 26 y across studies, 33,380 incident invasive brea...
This study was done on one nurseries affiliated to the center of Najaf governorate during growing season 2021-2022 corresponding 25/11/2021 determination effect Irrigation with magnetically treated water three intensity (0, 750, 1500) gauss and uses Super Micro Nano-fertilizer levels, first level (0 g.L-1), second (1 g.L-1) third (2 g.L-1). On some physiological indicators in pepper (Capsicum a...
Dietary intervention may alter the insulin-like growth factor (IGF) system and thereby cancer risk. In a qualitative review, eleven of twenty studies showed a link between one or more carotenoids, vegetable or fruit intake and the IGF system, however, with partly contrary findings, such that no firm conclusion can be drawn. Therefore, we evaluated associations between serum carotenoid concentra...
Carotenoids have drawn considerable interest, due to their role in preventing cardiovascular disease. In a large prospective study of female nurses, a 26% and 20% lower risk of coronary artery disease was observed among the subjects in the higher quintile of β-carotene and α-carotene intake over a 12 year, follow-up period, respectively, compared with those in the lower quintile (Osganian et al...
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