Xem 1-20 trên 67 kết quả Plant antioxidative
  • 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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  • 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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  • Free radicals are constantly formed in living cells and removed by antioxidant defenses. Antioxidant enzymes are the main line of defense against free radicals in animal and plant cells. Uncontrolled generation ROS are involved in a number of human disease states, including diabetes and cancer due to disturbance in cellular and molecular processes including cell growth, differentiation and proliferation.

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  • We have used a limited data set—comprised of a sector-level emissions inventory and original emissions estimates for a small sample of industrial facilities—to shed light on the links between maquiladoras, air pollution, and human health in Paso del Norte. We found that particulate emissions from maquiladoras undoubtedly have significant impacts on human health—collectively, these plants are probably responsible for dozens of cases of premature mortality and thousands of cases of respiratory disease each year.

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  • Sugars play important roles as both nutrients and regulatory molecules throughout plant life. Sugar metabolism and signalling function in an intri-cate network with numerous hormones and reactive oxygen species (ROS) production, signalling and scavenging systems.

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  • Hevea brasiliensis, a forest tree, which is indigenous to the tropical rain forests of Central and South America and the only major commercial source of natural rubber (NR), is one of the most recently domesticated crop species in the world. The modern age of NR in India actually started during the 1870s when the British successfully transported Hevea seeds from Brazil for planting in the then British India1.'. Rubber seems to be a fairly straightforward word.

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  • Plants inhabiting high alpine and nival zones are considered as living in an extreme environment. Extreme environments have been attractive for explorers for centuries, and nowadays they also attract tourists. Fortunately biological science is becoming increasingly aware that these remote habitats provide challenging questions that will help to understand the limits of life functions.

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  • Permanganate may be applied to sites as either potassium permanganate (KMnO4) or sodium permanganate (NaMnO4). Where cost dominates over engineering factors at a site, potassium permanganate is the preferred chemical form because it is more widely available, less costly, and is available in solid form, which facilitates transport and handling. Where other factors are more important, the liquid form of sodium permangante is preferable.

    pdf52p cao_can 29-12-2012 47 20   Download

  • The present book is a collection of ten original research articles and reports, associated with selected topics in agricultural chemistry. The discussed issues are organized in four sections: Classification and labeling of active substances in plant protection products, Environmental and stress plant physiology and behavior, Antimicrobial and antioxidant potential of plant extracts, and Pollutants analysis and effects. The information provided in this book should be of interest for academic researchers and for agriculturalists....

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  • Abiotic stresses are serious threats to agriculture and the environment which have been exa‐ cerbated in the current century by global warming and industrialization. According to FAO statistics, more than 800 million hectares of land throughout the world are currently salt-af‐ fected, including both saline and sodic soils equating to more than 6% of the world’s total land area. Continuing salinization of arable land is expected to have overwhelming global impact, resulting in a 30% loss of agricultural land over the next 25 years and up to 50% loss by 2050.

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  • The balance sheets of life and non-life insurance companies reflect the importance of technical (insurance underwriting) risks for insurance firms. Life insurance companies typically have the greater part of their liabilities taken up by technical provisions, in some jurisdictions more than 80 percent. This reflects the amount that the firm is setting aside to pay potential claims on the policies that it has written. Correspondingly, more than 90 percent of the assets of life insurance companies comprise the investment portfolio held to support these liabilities.

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  • The Council Directive 85/337/EEC of 27 June 1985 on the assessment of the effects of certain public and private projects on the environment 1 , as amended, known as the "EIA" (environmental impact assessment) Directive, requires that an environmental assessment to be carried out by the competent national authority for certain projects which are likely to have significant effects on the environment by virtue, inter alia, of their nature, size or location, before development consent is given. The projects may be proposed by a public or private person.

    pdf52p yeutinh98 26-09-2012 29 7   Download

  • The variables measuring the independence and financial expertise of the board and audit committees, the CEO’s influence on the board, and data on auditors’ fees were hand collected from the latest proxy statement dated before the announcement date of a restatement. We measure these variables before the restatement announcement because firms may change the structure of their board or audit committee or replace their CEOs after restating their earnings.

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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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  • We believe that it is interesting to study the system and software architecture of environments which integrate the evolving ideas of computational grids, distributed objects, web services, peer-to-peer networks and message oriented middleware. Such peer-to-peer (P2P) Grids should seamlessly integrate users to themselves and to resources which are also linked to each other. We can abstract such environments as a distributed system of “clients” which consist either of “users” or “resources” or proxies thereto.

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  • The most discussed effect of global warming is the increase of temperatures, although this increase will not be homogeneous through the seasons, with the winters expected to warm up significantly more than the summers. In addition, changes in precipitation are also expected that could lead to increase or decrease of rainfall, snowfall and other water-related events. Finally, a change in the frequency and intensity of storm events could be possible, although this is probably the most uncertain of the effects of global warming.

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  • There is huge uncertainty about future budget deficits and their financing. Economists disagree about how quickly deficits should be reduced: some would stress deflation risks and others inflation risks. Even if economists were to agree, there would still be great uncertainty about political choices on macroeconomic policy. It is nevertheless certain that government debt/GDP ratios in major countries will continue to rise over the next few years. Even the optimistic G20 pronouncements do not envisage debt/GDP ratios in the advanced countries stabilising before 2016.

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  • Local institutional investors in Brazil—pension funds and mutual funds—have been less active in the equity market. For instance, mutual funds’ asset allocation has been concentrated in safe and liquid assets such as government bonds and repo transactions. Pension funds, whose return target is typically set to achieve a certain spread over the rate of inflation in the context of a high short-term interest rate environment, tend to invest in inflation-linked bonds rather than equities.

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  • Adolescents, currently about 20 percent of the world’s population, have special reproductive health concerns and face risks related to early sexual experience, marriage and fertility. A rise in the age of marriage globally has contributed to declines in adolescent fertility. However, up to 50 percent of women in some countries still marry or enter a union by age 18, with this figure rising to 70 per- cent by age 20. The proportion of young women married or in union by age 20 is closely linked to adolescent fertility and exposure to reproductive health risks....

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  • Notwithstanding these developments in the area of governance, a recent Summit of the Organ Troika5 on Politics, Defense and Security of the South Africa Development Corporation (SADC) held at the end of March 2011 in Zambia, noted that the implementation of the GPA has been slow. The Summit was not satisfied with the polarization of the political environment characterized by the resurgence of violence, arrests and intimidation in the country.

    pdf12p lenh_hoi_xung 01-03-2013 28 5   Download

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