Organic compounds

Xem 1-20 trên 303 kết quả Organic compounds
  • The effect of some organic compounds on the activity of chitinase from Serratia marcescens has been investigated. Among these compounds, 1,10-phenanthroline was found to be an inhibitor and ethanol - an activator of the chitinase activity; -’ dipyridyl and Zn2+ do not take any effect on the chitinase activity. In this investigation, the dissociation constant of an chitinase-metalic ion complex (K1) and the inhibition constant (K2) have been estimated with K1 = 0.1 mcM and K2 = 2.667 mM.

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  • (BQ) Part 1 book "Organic chemistry" has contents: An introduction to the study of organic chemistry; electrophilic addition reactions, stereochemistry, and electron delocalization; substitution and elimination reactions; identification of organic compounds.

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  • Brominated compounds have received much attention recently because their toxic effects, including teratogenicity, carcinogenicity and neutrotoxicity, have been observed, in particular the brominated diphenyl ethers (Darnerud et al., 2001; Linda S. et al. 2003; Peter Alexander et al. 2003, Juliette Legler et al. 2003). The environmental behavior and fate of many brominated compounds are thought to be similar to those of chlorinated pollutants in the environment

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  • (BQ) Part 1 book "Organic chemistry" has contents: An introduction to the study of organic chemistry; hydrocarbons, stereochemistry and resonance; identification of organic compounds; substitution and elimination reactions.

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  • Organic chemistry is a subdiscipline within chemistry involving the scientific study of the structure, properties, composition, reactions, and preparation (by synthesis or by other means) of carbon-based compounds, hydrocarbons, and their derivatives. Organic compounds are structurally diverse. The range of application of organic compounds is enormous. They either form the basis of, or are important constituents of, many products including plastics, drugs, petrochemicals, food, explosives, and paints....

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  • In organic chemistry, a carbonyl group is a functional group composed of a carbon atom double-bonded to an oxygen atom: C=O. It is common to several classes of organic compounds, as part of many larger functional groups. The term carbonyl can also refer to carbon monoxide as a ligand in an inorganic or organometallic complex. Other organic carbonyls are urea and the carbamates, the derivatives of acyl chlorides chloroformates and phosgene, carbonate esters, thioesters, lactones, lactams, hydroxamates, and isocyanates.

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  • Organic light emitting diodes (OLEDs) have attracted enormous attention in the recent years because of their potential for flat panel displays and solid state lighting. This potential lies in the amazing flexibility offered by the synthesis of new organic compounds and by low-cost fabrication techniques, making these devices very promising for the market.

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  • Hydrogen peroxide is a strong oxidant that can be injected into a contaminated zone to destroy petroleum contaminants. When injected to groundwater, hydrogen peroxide is unstable, and reacts with organic contaminants and subsurface materials. It decomposes to oxygen and water within hours of its introduction into groundwater generating heat in the process. Peroxide is typically shipped to a remediation site in liquid form at dose concentrations ranging from five percent to 50 percent by weight.

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  • Food purchasing is an important expression of food habits. This paper therefore examines the factors associated with a household’s decision to purchase organic food products because such information is not yet available for the study area despite anecdotal evidence of the growing importance of organic products in the country. A randomly chosen sample of 200 consumers in rural and urban areas of the province’s two major regions, the former Ciskei and Transkei homeland areas, were enumerated.

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  • The European Union has developed the draft of a “Working document on sludge” (EU 2000), to promote the use of sewage sludge in agriculture while improving the safety and harmonize quality standards. It proposes limit values for concentrations of heavy metals and organic compounds that should restrict the use of sewage sludge in agriculture if the limits are exceeded and provides suggestions for good practice in treatment and agricultural use.

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  • In this chapter, we study the three-dimensional structures of molecules to understand their stereochemical relationships. We compare the various types of stereoisomers and study ways to differentiate among stereoisomers. In future chapters, we will see how stereochemistry plays a major role in the properties and reactions of organic compounds.

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  • The systematic review search process identified 162 relevant articles published, with an English abstract, in peer-reviewed journals since 1st January 1958 until 29th February 2008. A total of 3558 comparisons of content of nutrients and other substances in organically and conventionally produced foodstuffs were extracted for analysis.

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  • The standard is intended for the development of organic production and trade in the East African region. The standards can be a platform for a common label for organic products in East Africa and for developing consumer trust. The standard also formulates standpoints which can be used in international negotiations on standards. Further, it can be a basis for equivalence agreements with other countries and regions. The East African organic products standard has been written in a way to make it easy for the reader and user to access and understand.

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  • Alcohols are versatile organic compounds since they undergo a wide variety of transformations – the majority of which are either oxidation or reduction type reactions. In this chapter provides knowledge of reactions of alcohols. This chapter presents the following content: Deprotonation, SN1/SN2 via protonation, carbocation rearrangements,...and other contents.

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  • (BQ) Part 1 book "Textbook of organic medicinal and pharmaceutical chemistry" presents the following contents: Drug design strategies, metabolic changes of drugs and related organic compounds, biotechnology and drug discovery, immunobiologicals, anti infective agents, antibacterial antibiotics, antiviral agents,...

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  • (BQ) Part 2 book "General chemistry principles and modern applications" has contents: Chemistry of the living state, reactions of organic compounds, structures of organic compounds, nuclear chemistry, complex ions and coordination compounds, the transition elements,...and other contents.

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học 'Respiratory Research cung cấp cho các bạn kiến thức về ngành y đề tài:" Exhaled volatile organic compounds in patients with non-small cell lung cancer: cross sectional and nested short-term follow-up study...

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  • The complexity of the volatile organic compound (VOC) mixture in the Houston area makes studies of the air quality in that area very challenging. In this paper, a novel factor analysis model, where the normal chemical mass balance model was augmented by a parallel equation that accounted for wind speed and direction, temperature, and weekend/weekday effects, was fitted with a multilinear engine (ME) to provide identification and apportionment of the VOC sources at the La Porte Municipal Airport site in Houston during the Texas Air Quality Study (TexAQS) 2000.

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  • Chapter 11 - Reactions of Alcohols. Alcohols are important organic compounds because the hydroxyl group is easily converted to almost any other functional group. In Chapter 10, we studied reactions that form alcohols. In this chapter, we seek to understand how alcohols react and which reagents are best for converting them to other kinds of compounds.

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  • (BQ) Part 2 book "Elements of environmental chemistry" has contents: CO2 equilibria, fates of organic compounds, toxic environmental compounds, water solubility, fish partition coefficients, problem set, polluted rain.

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