Xem 1-20 trên 27 kết quả Antioxidant vitamins
  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Critical Care giúp cho các bạn có thêm kiến thức về ngành y học đề tài: Oxidative stress is increased in critically ill patients according to antioxidant vitamins intake, independent of severity: a cohort study...

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  • This book is for anyone who wants an understanding of the fascinating role vitamins and minerals play in nutrition. It can be used as a supplementary textbook for nutrition classes, as a self-learning guide, and as a refresher for health professionals. This book broadens and explains the vitamin and mineral information found in standard nutrition courses. Throughout the text are many figures, graphs, and tables that visually display information and relationships. If you have not taken a class in biochemistry, then this will be an interesting and relevant way to be introduced to it....

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  • Bài giảng Vitamins, khoáng chất, Antioxidants, Phytonutrients, thực phẩm chức năng cung cấp cho các bạn những kiến thức về khái niệm cũng như phân loại, đặc điểm của Vitamins, khoáng chất, Antioxidants, Phytonutrients, thực phẩm chức năng. Mời các bạn tham khảo bài giảng để bổ sung thêm kiến thức về lĩnh vực này.

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  • Toxicity The safe upper limit for vitamin B6 has been set at 100 mg/d, although no adverse effects have been associated with high intakes of vitamin B 6 from food sources only. When toxicity occurs, it causes a severe sensory neuropathy, leaving patients unable to walk. Some cases of photosensitivity and dermatitis have also been reported. Folate, Vitamin B12 See Chap. 90. Vitamin C Both ascorbic acid and its oxidized product dehydroascorbic acid are biologically active.

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  • Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read. Since natural and/or dietary supplements are not FDA approved they must be accompanied by a two-part disclaimer on the product label: that the statement has not been evaluated by FDA and that the product is not intended to "diagnose, treat, cure or prevent any disease." ...

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  • The vitamins are a chemically disparate group of compounds whose only common feature is that they are dietary essentials that are required in small amounts for the normal functioning of the body and maintenance of metabolic integrity.Metabolically, they have diverse functions, such as coenzymes, hormones, antioxidants, mediators of cell signaling, and regulators of cell and tissue growth and differentiation.

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  • It has been recognized for many years that states of nutrient deficiency are associated with an impaired immune response and with increased susceptibility to infectious disease. In turn, infection can affect the status of several nutrients, thus setting up a vicious circle of under nutrition, compromised immune function and infection.

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  • Following their lipophilicity, it is more plausible that vitamin E and ß-carotene cooperate to protect membranes and lipoproteins from oxidative damages. Of course, as all antioxidants, vitamin E exerts other biological functions that are independent from its antioxidant properties, including modulation of cellular signaling, gene expression, immune response, and many more. However, as opposed to other vitamins, lack of vitamin E results in rather unspecific symptoms, also highlighting that this vitamin is mainly needed for its antioxidant activity in vivo.

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  • Cơ thể có thể không đủ enzym để tổng hợp Co Q10 và cũng thật khó lòng mà cơ thể ng-ời s.n xuất đ-ợc l-ợng tối -u. Những yếu tố làm gi.m mức Co Q10 trong cơ thể là tuổi cao, nghiện r-ợu, chế độ dinh d-ỡng thiếu (các vitamin, yếu tố vi l-ợng), luyện tập c-ờng độ cao, nghiện thuốc lá trực tiếp và gián tiếp, các stress (về tâm lý, ốm đau, nhiễm lạnh...), dùng một số thuốc (nh- các statin, thuốc phong bế bêta, thuốc chống trầm c.m).

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  • The Physicians’ Health Study II, which included more than 14,000 male physicians aged 50 or older, found that neither vitamin E nor vitamin C supplements reduced the risk of major cardiovascular events (heart attack, stroke, or death from cardiovascular disease), cancer, or cataracts. In fact, vitamin E supplements were associated with an increased risk of hemorrhagic stroke in this study.

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  • Vitamin C, a reducing agent and antioxidant, is a cofactor in reactions cata-lyzed by Cu + -dependent monooxygenases and Fe 2+ -dependent dioxygenas-es. It is synthesized, in vertebrates having this capacity, fromd-glucuronate. The latter is formed through direct hydrolysis of uridine diphosphate (UDP)-glucuronate by enzyme(s) bound to the endoplasmic reticulum mem-brane, sharing many properties with, and most likely identical to, UDP-glucuronosyltransferases.

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  • Unlike the studies described above, the Age-Related Eye Disease Study (AREDS), led by the National Eye Institute and cosponsored by other components of NIH, including NCCAM, found a beneficial effect of antioxidant supplements. This study showed that a combination of antioxidants (vitamin C, vitamin E, and beta-carotene) and zinc reduced the risk of developing the advanced stage of age-related macular degeneration by 25 percent in people who had the intermediate stage of this disease or who had the advanced stage in only one eye.

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  • Vitamin C (ascorbic acid) is a water-soluble antioxidant, constituting one among the most prevalent dietary antioxidants found in fruits, vegetables and beverages. Dietary intake is usually in the area of 100 mg/d, with a DRI-RDA of 75mg/d (men) and 60mg/d (women) (National Academy of Sciences, 2000). Food items rich in vitamin C include bell peppers (ca. 120 mg/100g) and citrus fruits such as oranges (ca. 50 mg/100g) (Souci, 2000). Vitamin C contribution to the total antioxidant activity conferred e.g.

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  • Một nghiên cứu chỉ ra rằng những thức ăn chứa nhiều vitamin và chất khoáng có thể thúc đẩy hooc-mon và làm tăng sự kích thích những dây thần kinh nhạy cảm trên cơ thể, tạo hưng phấn trong chuyện 'chăn gối' của các cặp uyên ương. Dâu tây Màu đỏ đậm và chín mọng của dâu tây trông hấp dẫn như đôi môi gợi cảm của một thiếu nữ.

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  • Rau quả tươi là nguồn cung cấp vitamins, chất khoáng, chất xơ và nhất là các hoạt chất thực vật ( phytochemicals) có tác dụng như những chất chống oxy hóa (antioxidants). Ăn nhiều rau cải và trái cây rất tốt cho sức khỏe, không sợ bị béo phì vì chúng chứa rất ít calorie, và chất béo hầu như không đáng kể.

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  • There is growing evidence on the importance of studies focusing on mechanisms and strategies leading to cancer prevention. The plethora of approaches include regulation of oxidative stress using antioxidant therapies, carefully balanced diets and living habits, epidemiological evidence and molecular approaches on the role of key biological molecules such as antioxidant enzymes, vitamins, proteins and naturally occurring free radical scavengers as well as controversial results and clinical applications. These are some of the topics that this book highlights.

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  • It has been considered that vitamin E is the major membrane bound antioxidant employed in humans, and thus this lipophilic chain breaking antioxidant has the ability to inhibit lipid peroxidation. Synergistic actions between vitamin C and vitamin E therefore appear important in their preventive activity against lipid peroxidation. Human trials and in-vitro studies have shown that oxidative stress causes a rapid depletion of vitamin C and vitamin E (reviewed by Bouayed & Bohn, 2010).

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  • Paraplegia remains a potential complication of spinal cord ischemic reperfusion injury (IRI) in which oxidative stress induced cyclooxygenase activities may contribute to ischemic neuronal damage. Prolonged administration of vitamin E (α-TOL), as a potent biological antioxidant, may have a protective role in this oxidative inflammatory ischemic cascade to reduce the incidence of paraplegia. The present study was designed to evaluate the preventive value of α-TOL in IRI of spinal cord.

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  • Theo giới chuyên môn, hệ miễn dịch đóng vai trò quan trọng trong việc giúp cơ thể chống lại các mầm lây bệnh từ chứng cảm lạnh thông thường tới bệnh ung thư. Qua kết quả nghiên cứu, bốn loại thực phẩm dưới đây đã được chứng minh có tác dụng tuyệt vời trong việc tăng cường hệ miễn dịch: 1. Cam đã được biết đến là nguồn dồi dào vitamin C – một loại antioxidant có tác dụng giúp hệ miễn dịch chống lại các mầm bệnh.

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  • Carotenoids are hydrophobic compounds and thereby act as lipophilic antioxidants preventing polyunsaturated fatty acids from oxidative damages. In fact, carotenoids are incorporated into lipid membranes and thus could act as chain-breaking antioxidants by stopping free radical chain reactions (propagation of lipid peroxidation), scavenging lipid peroxyl radicals (LOO•), avoiding the abstraction of allylic hydrogens from neighboring lipids. Inactivation of lipoxygenase activity by carotenoids is also proposed as another mechanism of protection against oxidative stress.

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