Xem 1-20 trên 35 kết quả Purple bacteria
  • An additional benefit of hydrogen peroxide and Fenton's Reagent is the temporary increase of oxygen levels in and around the treatment area. The increased oxygen levels at the fringes of the treatment area can enhance naturally occurring aerobic biodegradation processes that reduce contaminant mass. While there may be concerns about oxidizing hydrocarbon-degrading bacteria in the chemical oxidation treatment area, many studies have shown that soil cannot be readily sterilized by Fenton's Reagent and that microbial populations rapidly rebound following chemical oxidation treatment.

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  • Transmembrane proton translocation in the photosynthetic membranes of the purple bacteriumRhodobacter sphaero-ides is driven by light and performed by two transmem-brane complexes; the photosynthetic reaction center and the ubiquinol–cytochromecoxidoreductase complex, coupled by two mobile electron carriers; the cytochrome and the quinone. This paper focuses on the kinetics and thermo-dynamics of the interaction between the lipophylic electron carrier ubiquinone-10 and the photosynthetic enzyme reconstituted in liposomes. ...

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  • Vi khuẩn không lưu huỳnh màu tía là nhóm vi khuẩn quang dị dưỡng hữu cơ (photoorganoheterotrophs) thường kỵ khí bắt buộc, một số loài là quang tự dưỡng vô cơ không bắt buộc (trong tối là hoá dị dưỡng hữu cơchemoorganoheterotrophs). Tế bào chứa chlorophyl a hoặc b, hệ thống quang hợp chứa các màng hình cầu hay hình phiến (lamellar) gắn với màng sinh chất.

    pdf5p cachuadam 26-05-2011 161 34   Download

  • I.Vi sinh vật quang hợp 1.Các vi khuẩn quang quang hợp (Phototrophic bacteria) 1.Vi khuẩn lưu huỳnh màu tía (Purple sulfur bacteria): a-HọChromatiaceae b-HọEctothiorhodospiraceae 2-Vi khuẩn không lưu huỳnh màu tía (Nonsulfure purple bacteria) 3.Vi khuẩn lưu huỳnh màu lục (Green sulfure bacteria) 4.

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  • Vi khuẩn lưu huỳnh màu tía (Purple sulfur bacteria): Thuộc nhóm này là các vi khuẩn kỵ khí bắt buộc, có khả năng quang tự dưỡng vô cơ (photolithoautotroph), tế bào có chứa chlorophyll a hoặc b , hệ thống quang hợp chứa các màng hình cầu hay hình phiến (lamellar) gắn với màng sinh chất. Để dùng làm nguồn cho điện tử (electron donors) trong quang hợp thường sử dụng H2, H2S hay S .

    pdf4p cachuadam 26-05-2011 92 20   Download

  • Phototrophic green bacteria, phototrophic purple bacteria, and heliobacteria are three groups of bacteria that use anoxygenic photosynthesis. Anoxygenic phototrophs have photosynthetic pigments called bacteriochlorophylls. Bacteriochlorophyll a and b have maxima wavelength absorption at 775 nm and 790 nm, respectively in ether. Unlike oxygenic phototrophs, anoxygenic photosynthesis only functions using a single photosystem. This restricts them to cyclic electron flow only, and they are therefore unable to produce O2 from the oxidization of H2O.

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  • One company is training its producers on the use of social media because it believes the producer level is where it will be most useful (@Allstate, 2010). Another company’s director of social media said his goal is to give producers support in figuring out what they should say — and make sure they do not do something they should not. He said many producers previously got to the point of setting up a presence on a social media site, but then lacked the knowledge and confidence to use it successfully. As previously noted, some producers have made use...

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  • This thesis investigates the protection landscape surrounding online banking. First, electronic banking is analysed for vulnerabilities and a survey of current attacks is carried out. This is represented graphically as an attack tree describing the different ways in which online transactions can be attacked. The discussion then moves on to various defences which have been developed, categorizing them and analyzing how successful they are at protecting against the attacks given in the first chapter.

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  • The rest of this paper is structured as follows: Section 2 sets both alternatives against a more detailed history of innovation and the emergence of cinema consumption, sharpening our sense of both the technology aspect and the lag between technical possibility and take-off. In section 3 the available data sources relevant to understanding how the consumption of cinema grew are identified and analyzed in depth, and national differences decomposed in those due to technology and those due to taste.

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  • Revenue insurance accounts for more than half of all crop insurance policies (Figure 2). It began in 1997 as a buy-up option on a pilot basis for major crops. By 2003, acreage under revenue- based insurance exceeded acreage covered by APH policies. Revenue insurance combines the production guarantee component of crop insurance with a price guarantee to create a target revenue guarantee. Under revenue insurance programs, participating producers are assigned a target level of revenue based on market prices for the commodity and the producer’s yield history.

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  • Unable to impassively watch as health care spending spiraled upward, federal health care planners imposed an armada of regulations on the manner in which health care was provided to Medicare and Medicaid patients. The reg- ulatory binge in U.S. health care since the 1970s has produced nearly 50 kinds of federal and state health services’ regulations, which by 2002 was costing roughly $340 billion, about 20% of total health spending of $1,560 billion.

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  • Online auctions are the new kids on the block for selling cars. Although there are several sites that handle online car auctions, eBay Motors at www.motors.ebay. com is the most widely used and recognized. An online auction allows you to reach a wide audience of potential buyers, is less costly than sending a car to a live auction, and combines many of the best features of a private sale with sending a car to auction. For tips on selling your car online and using the online auction process, call the Ask Hagerty Concierge Service at 888-310- 8020, menu option 3 to request...

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  • This report presents an overview of the field of building engineering physics and identifies opportunities for developments that will benefit society as a whole, as well as employers, universities, professional engineering institutions and in particular professionals who are following careers with building engineering physics as the basis. The report makes key recommendations for Government policy, academic and industry research directions and professional development in the field to achieve the skill levels necessary to deliver mass market low carbon buildings.

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  • The members of the cautious group, which have traditionally been protecting and supporting their agriculture markets, want to make sure that—despite progressing liberalization—there will be enough room for them to continue providing farmers with larger sums of support. As a result, this group wants to retain an instrument (such as the Green Box) through which larger amounts of subsidies can be paid to their farming sector to sustain a minimum degree of farming activity.

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  • This report presents an overview of the state of women’s health in the European Union and addresses both the differences between men and women and the differences among women living in different Member States. It examines the main patterns of mortality and morbidity and the health risk factors at different stages of women’s lives and reports on the current situation and recent trends in European women’s health. It also provides information about the influence of demographic trends and socio- economic factors on women’s health.

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  • In debating these numbers, parties have to look at the actual historical numbers for the property, the quality of management and the impact of a management or ownership change on those numbers, and what is going on in the marketplace. This applies not only to income and expenses from operation, but in ultimate disposition values as well. Real estate can be particularly challenging, as tax, utility and repair costs can be hard to predict and beyond ownership control, and there are a number of factors from the marketplace with affect vacancy rates or tenant based risks. Added...

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  • Although FHLBanks can use published securities ratings to help make investment decisions, they should also consider other sources of financial information. Exclusive reliance on ratings can be an unsafe and unsound banking practice because credit ratings may lag actual changes in credit quality. There have been a number of instances where companies maintained investment grade ratings until just before they defaulted. To manage investment risks prudently, FHLBanks should supplement external ratings with internal credit analysis.

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  • The Convention also targets two industrial chemicals: hexachlorobenzene (HCB), which is also used as a pesticide and can be a byproduct of pesticide manufacture, and the class of industrial chemicals known as PCBs, or polychlorinated biphenyls. PCBs have received a great deal of publicity for polluting rivers and lakes in industrial regions, killing or poisoning fish, and causing several human health scandals, including contamination of rice oil in Japan in 1968 and Taiwan in 1979.

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  • In the absence of effective international cooperation in these areas, resolution of institutions, in the event of a failure within a banking group, may be less costly and less destabilizing if these entities are organized as subsidiaries. Moreover, healthy subsidiaries that operate independently of the parent may, in principle, be better able to survive the failure of the parent or other affiliates.

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  • Policies of aggressive capitalization and extended amortization periods of use. Unlike enterprises that improve their results by increasing revenue, some companies increase their result by minimizing costs. They minimize their costs by aggressive capitalization of costs that should affect the profit and loss account also by depreciating amounts for extended periods. There are cases where expenditure to be capitalized is not easily determined and thus, it is recommended to appeal to professional judgment in order to determine whether or not capitalization is required.

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