Xem 1-20 trên 20 kết quả Antioxidant mechanisms
  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Differential patterns of reactive oxygen species and antioxidative mechanisms during atrazine injury and sucrose-induced tolerance in Arabidopsis thaliana plantlets

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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.

    pdf488p wqwqwqwqwq 20-07-2012 33 7   Download

  • 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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  • Plant response to reduced water availability and other abiotic stress (e.g. metals) have been analysed through changes in water absorption and transport mechanisms and also by molecular and genetic approach. A relatively new aspects of fruit nutrition are presented in order to provide the basis for the improvement of some fruit quality traits. The involvement of hormones, nutritional and proteomic plant profiles together with some structure/function of sexual components have also been addressed.

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  • The first edition of Food Lipids was published in 1998 and the second edition in 2002 by Marcel Dekker, Inc. Taylor & Francis Group, LLC, acquired Marcel Dekker and the rights to publish the third edition. We firmly believe that this book has been of interest and will help those involved in lipid research and instruction. Many have bought the previous editions and we thank you for your support. The need to update the information in the second edition cannot be overstated, as more data and new technologies are constantly becoming available.

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  • This study used biomarkers of internal dose, exposure and effect, which allowed setting the pesticides levels in 132 biological samples. OC pesticides which were most frequently found in biological samples were 4,4-DDE and endosulfan. It is important to point out that laborers did not report the use of these pesticides in the tomato crop, so the presence of these is explained by the environmental pollution and toxicokinetics inherent to this group of pesticides.

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  • Plants are sessile organisms and as such must have mechanisms to deal with both abiotic and biotic stresses to ensure survival. The term “abiotic stress” includes many stresses caused by environmental conditions such as drought, salinity, UV and extreme temperatures. Due to global climate change it is predicted that abiotic stresses will increase in the near future and have substantial impacts on crop yields (Intergovernmental Panel of Climate Change; http://www.ipcc.ch).

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  • Our setup allows us to disentan- gle the implications of these two alternative pricing mechanisms that are standard in the open-economy macro literature. In our model, di®erent assumptions regarding the pricing decisions of ¯rms are virtually inconsequential for the properties of aggregate variables, other than the terms of trade. In particular, the real exchange rate and the international relative price of ¯nal tradable goods behave similarly across the two price setting regimes.

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  • Our identiÖcation relies on the standard assumption in the tax evasion literature that re- ported income is equal to true income for wage earners. 6 We thus estimate the sensitivity of credit o§ered to income o§ the wage earners. Since one needs a certain amount of cash mechan- ically to service debt, the true income-to-credit relationship should be the same for individuals only di§ering as to self-employment or not.

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  • A number of drugs used in cancer chemotherapy induce oxidative stress by generation of oxygen free radicals (ROS) which might be an alternative mechanism for their cytotoxic effect via indu-cing apoptosis. In order to clarify the roles of antioxidants in chemotherapy, we investigated Quercetin (3,3’,4’,5,7-pentahyd-roxyflavone) and N-acetylcysteine (NAC) in different cell types treated with anticancer drugs. We studied cytotoxic activity of Topotecan alone and/or in combination with Quercetin in two human breast cancer cell lines, MCF-7 and MDA-MB-231. ...

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  • Curcumin, a component of turmeric, has potent antitumor activity against several tumor types. However, its molecular target and mechanism of anti-proliferative activity are not clear. Here, we identified curcumin as a novel antimicrotubule agent. We have examined the effects of curcumin on cellu-lar microtubules and on reconstituted microtubules in vitro.

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  • While the nature and prevalence of defensive medical practices have been widely debated, most agree that the costs are exorbitant. In fact, some estimates report that the practice of defensive medicine costs the American health care system in excess of $100 billion dollars annually, which would account for up to 12% of all health care expenditures.

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  • Peroxiredoxins are abundant cellular antioxidant proteins that help to con-trol intracellular peroxide levels. These proteins may also function, in part, through an evolved sensitivity of some peroxiredoxins towards peroxide-mediated inactivation in hydrogen peroxide signaling in eukaryotes.

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  • The classic theories are based on the scientific and rational view of the companies, of management systems and on the scientific organisation of the work, premises under which it is assumed that employees are passive subjects whose performance may be totally controlled by formal mechanisms.

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  • However, from an energetic point of view, it has been debated that phenolics favour hydrogen atom transfer mechanisms, in which lower energies are involved (Leopoldini et al., 2011). The radicals derived from oxygen represent the most important class of radical species generated in living systems. However the term antioxidant is often used to describe the scavenging activity of all reactive radicals including e.g. RNS radicals.

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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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  • H2O2 generation is a limiting step in thyroid hormone bio-synthesis. Biochemical studies have confirmed that H2O2is generated by a thyroid Ca 2+ /NADPH-dependent oxidase. Decreased H2O2 availability may be another mechanism of inhibition of thyroperoxidase activity produced by thio-ureylene compounds, as propylthiouracil (PTU) and methimazole (MMI) are antioxidant agents. Therefore, we analyzed whether PTU or MMI could scavenge H2O2or inhibit thyroidNADPHoxidase activityin vitro.

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  • This innovative book integrates the disciplines of biomedical science, biomedical engineering, biotechnology, physiological engineering, and hospital management technology. Herein, Biomedical science covers topics on disease pathways, models and treatment mechanisms, and the roles of red palm oil and phytomedicinal plants in reducing HIV and diabetes complications by enhancing antioxidant activity.

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  • Reactive oxygen species contribute to the development of various human diseases. Ischemia is characterized by both significant oxidative stress and characteristic changes in the antioxidant defense mechanism. Heat shock protein 27 (HSP27) has a potent ability to increase cell survival in response to oxidative stress. In the present study, we have investigated the protective effects of PEP-1–HSP27 against cell death and ischemic insults.

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  • 2-Cys peroxiredoxins (2-Cys Prx) are ubiquitous thiol-containing peroxidas-es that have been implicated in antioxidant defense and signal transduction. Although their biochemical features have been extensively studied, little is known about the mechanisms that link the redox activity and non-redox processes.

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