Chemical mixtures

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  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học quốc tế cung cấp cho các bạn kiến thức về ngành y đề tài: Research A generalized physiologically-based toxicokinetic modeling system for chemical mixtures containing metals...

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Project summary: a critical synopsis of mechanisms of action of low-dose xenobiotics in mammalian organisms as a basis for assessing aggregated effects of chemical mixtures and identifying “new” toxicological end points

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  • content decreased (Agblevor et al. 1994). The equivalents of chlorine per equivalent of alkali or alkaline earth metals increased from 3.4 to 8.5 during this filtration. This suggests that the residual inorganics may be present as chlorides and that much of the chlorine may be in solution. Chloride ions in solution will have an adverse effect on corrosion of many metals, including stainless steels such as SS304. Compared to coal and many crude oils, biomass has a low sulfur content.

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  • Paradoxically, skin is both a primary barrier to systemic absorption of topically exposed chemicals and a portal to systemic delivery of transdermal medicaments. Knowledge of the factors that determine both extent and rate of chemical flux across the skin is an important component of both toxicology and pharmacology studies. The aim of this book is to provide current approaches and techniques by which dermal absorption may be quantitated utilizing end points relative to these two disciplines.

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  • Effective prediction of transport of chemical pollutants through a subsurface groundwater system and associated assessments of risk requires a valid “conceptual model” of the contaminant migration scenario. The classical contaminant conceptual model is one of a near- surface “leachable source zone” where chemical contaminant is leached, i.e. dissolved/solubilised, into water infiltrating through the source (Figure 4.2).

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  • Project Gutenberg Etext of An Introduction to Chemical Science by R.P. Williams Copyright laws are changing all over the world, be sure to check the laws for your country before redistributing these files!!! Please take a look at the important information in this header. We encourage you to keep this file on your own disk, keeping an electronic path open for the next readers. Please do not remove this. This should be the first thing seen when anyone opens the book. Do not change or edit it without written permission....

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  • Chemical substances are often called 'pure' to set them apart from mixtures. A common example of a chemical substance is pure water; it has the same properties and the same ratio of hydrogen to oxygen whether it is isolated from a river or made in a laboratory. Other chemical substances commonly encountered in pure form are diamond (carbon), gold, table salt (sodium chloride) and refined sugar (sucrose). However, simple or seemingly pure substances found in nature can in fact be mixtures of chemical substances.

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  • Bovine seminal ribonuclease (BS-RNase), a homodimeric protein displaying selective cytotoxicity towards tumor cells, is isolated as a mixture of two isoforms, a dimeric form in which the chains swap their N-termini, and an unswapped dimer.

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  • A new 8,1-neolignan, tatarinone, 4-[2-(1,2,3-trimethoxybenz-5-yl)-1-methylethyl]-2,5- dimethoxy-4-(2-propenyl)-2,5-cyclohexadien-1-one, has been isolated from Acorus tatarinowii rhizome and its structure determined by spectroscopic methods, including 2D-NMR spectra. Asarylaldehyde and a mixture of -asarone and -asarone were also isolated and indentified.

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  • A thermodynamic model for heterogeneous mixtures involving multi-molecular sorption is proposed. Some complex relationships between sorption potential, diffusion, sorption kinetics polymer network change kinetics, chemical affinity energy of internal changes and physico- chemical properties of polymer network are obtained. This model has interpreted some experimental results of fluid sorption in polymer network. Proposed model may be also used for study of other problems in heterogeneous mixture of fluid and polymers.

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  • A mixture 3-O- -D-glucopyranosylstigmasta-5,22-diene 1a and 3-O- -D- glucopyranosylstigmasta-7,22-diene 1b, 1’-O-benzyl- -D-glucopyranoside 2 and (8Z)-2-(2- hydroxypentacosanoylamino)octadeca-8-ene-1,3,4-triol 3 were the first time isolated from Polyscias serrata. Among them, compound 3 was the first time found in the genus Polyscias.

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  • The current volume entitled Protein Purification is designed to facilitate rapid access to valuable information about various methodologies. It aims as well to provide an overview of state-of-art techniques for the purification, analysis and quantification of proteins in complex samples using different enrichment strategies.Protein purification is a series of processes intended to isolate a single type of protein from a complex mixture. Protein purification is vital for the characterization of the function, structure and interactions of the protein of interest....

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  • Difficult to measure accurately and deal with effectively, organic pollutants continue to be a major hazard in the environment. Significantly expanded, the second edition of Organic Pollutants: An Ecotoxicological Perspective describes the mechanistic basis of ecotoxicology, using major groups of pollutants as illustrative examples, and explores the problem of complex mixtures of chemicals.

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  • While the term chemical substance is a precise technical term that is synonymous with "chemical" for professional chemists, the meaning of the word chemical varies for non-chemists within the English speaking world or those using English. For industries, government and society in general in some countries,[10] the word chemical includes a wider class of substances that contain many mixtures of such chemical substances, often finding application in many vocations.

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  • The most widely used analytical separation technique for the qualitative and quantitative determination of chemical mixtures in solution in the pharmaceutical industry is high-performance liquid chromatography (HPLC). However, conventional detectors used to monitor the separation, such as UV, refractive index, fluorescence, and radioactive detectors, provide limited information on the molecular structure of the components of the mixture. Mass spectrometry (MS) and nuclear magnetic resonance (NMR) are the primary analytical techniques that provide structural information on the analytes.

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  • bridge University, Cambridge, 1967; Bird, Stewart, and Lightfoot, Transport Phenomena, 2d ed., Wiley, New York, 2002; Brodkey, The Phenomena of Fluid Motions, Addison-Wesley, Reading, Mass., 1967; Denn, Process Fluid Mechanics, Prentice-Hall, Englewood Cliffs, N.J., 1980; Landau and Lifshitz, Fluid Mechanics, 2d ed., Pergamon, 1987; Govier and Aziz, The Flow of Complex Mixtures in Pipes, Van Nostrand Reinhold, New York, 1972, Krieger, Huntington, N.Y., 1977; Panton, Incompressible Flow, Wiley, New York, 1984; Schlichting, Boundary Layer Theory, 8th ed.

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  • To a solution of 45 g 3,4,5- trimethoxybenzaldehyde in 1.2 L IPA, there was added 125 g nitropropane and 67.5 g t- butylammonium acetate and the reaction mixture was held at reflux for 16 h. This was poured into 6 L H2O, and extracted with 2x250 mL hexane. The pooled extracts were stripped of solvent under vacuum giving a residue that slowly set to a crystalline mass.

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  • The Physical Chemistry In Brief offers a digest of all major formulas, terms and definitions needed for an understanding of the subject. They are illustrated by schematic figures, simple worked-out examples, and a short accompanying text. The concept of the book makes it different from common university or physical chemistry textbooks. In terms of contents, the Physical Chemistry In Brief embraces the fundamental course in physical chemistry as taught at the Institute of Chemical Technology, Prague, i.e.

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  • Petroleum mixtures consist primarily of relatively unreactive complex hydrocarbons covering a wide boiling range. Such mixtures are difficult to separate by most analytical techniques. Therefore, the petroleum industry has for many years played a leading role in the development of chromatographic methods of analysis. Since the last book specifically concerned with chromatographic analysis of petroleum appeared 15 years ago, numerous advances have been made including developments in liquid and supercritical fluid chromatography, ...

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  • Limitations: The Wurtz reaction is limited to the synthesis of symmetric alkanes from alkyl iodides & bromides. If two dissimilar alkyl halides are taken as reactants, then the product is a mixture of alkanes that is, often, difficult to separate. A side reaction also occurs to produce an alkene. The side reaction becomes more significant when the alkyl halides are bulky at the halogen-attached carbon.

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