für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Triethanolamine-glycerylmaleate polymer was prepared, and identified by FTIR spectroscopy then swelling tests were performed for this polymer in different solvents. The adsorption processes of the some phenols and acids compounds: ph, na, nal, B, AB and DAB in aqueous solutions on the surface of this polymer were investigated by the use of UV-visible spectrophotometer and also studied at different: temperatures, ionic strength, and pH. The results revealed that the adsorption for compound at temperature of 25 °C took: S-mode for all compounds according to Giles classification. 1- At temperature of 25 C the adsorbate amount arrange to the following order: ph nal na B AB DAB 2- The adsorption for ph, na, nal, and B take the following order for ionic strength 0.1M NaCl 0.0M NaCl 0.2M NaCl But for AB, and DAB take 0.0M NaCl 0.1M NaCl 0.2M NaCl 3- Generally it was noticed that adsorption quantities is proportionally correlated with the pH studies. 4- The H values for all adsorbate compounds were negative, while S values were negative for all compounds except for ph and B. 5- In comparison with zeolite (5A) the prepared polymer posse s ····· 10361135715
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The optically pure compounds have supreme importance in pharmaceuticals, agrochemicals, fine chemicals, and biochemical research as enantiomers express themselves differently in biological systems. Presently optically active compounds in their high optical purity are mainly obtained through (i) asymmetric catalysis, (ii) enantiomer separation with the use of various chemical/analytical techniques. Nowadays, the separation of chirally pure compounds at qualitative and quantitative scale using different chromatographic techniques with chiral stationary phases (CSPs) and enantiomer self-disproportionation (ESD) has become a vital requirement. This is because CSPs and ESD are the most powerful and practical tool for making chirally pure compounds when both the form of isomers are required. The main objective of our research is to investigate a practical, reusable, rapid, and efficient process among CSP and ESD based chromatography, as selective separation is concern. Subsequently, we have investigated the application of these CSPs as recyclable heterogeneous catalysts for asymmetric nitroaldol reaction to afford chiral nitroalcohols in good to excellent yields and enantioselectivity. ····· 10361135712
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Superheated water has been widely utilized in the extraction of organic pollutants, pesticides, natural products as well as inorganic compounds from a variety of sample matrices. The rapid development of superheated water extraction (SWE) has led to the direct combination of this technique with conventional chromatographic methods. However, these coupling methods still required a considerable amount of organic solvent. This book, therefore, introduces a design of an on-line coupled system of SWE method with superheated water chromatography (SWC) by using simple switching valves and a solid-phase trap as the interface between the extractor and the chromatograph. The trap column was used to collect the extracted analytes and pre-concentrate them prior to chromatographic analysis. It could also be used as a clean-up step for the removal of the matrix interferences from the extract. Because superheated water was used as the extractant, as the mobile phase, as well as the washing solvent, the use of organic solvent has been avoided in any stages of this on-line SWE-SWC method, and hence it is compatible with green chemistry . ····· 10361135660
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Analytical method development and validation play a major role in the discovery, development and manufacturing of pharmaceuticals. The official test method that results from these processes is used by quality control laboratories to ensure the identity, purity, potency and performance of drug product quality, essential for drug safety and efficiency. Method development is a formalized process by which a set of separation criteria are determined with a defined set of parameters such that the same separation profile is achieved. The process of method development can be quantitative or qualitative. ····· 10361135577
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The biosorption studies of Crystal Violet from aqueous solution have been carried out on Moringa Oleifera saw as a function of concentration, temperature, particle size, ionic strength and acids and bases. Moringa Oleifera saw was subjected to various treatments and the effect of pre-treatment and post-treatment have been studied in determining the biosorption strength, extent of biosorption, mode of sorption and Langmuir and Freundlich sorption parameters. Sorption of Crystal Violet as a function of initial concentration followed exclusively S-type isotherm. In other cases, H-type sorption profile has also been observed. The S-type is the representative of edgewise sticking of the adsorbed species giving the indication of no aggregate dye molecules on the surface. The H-type represents large size micelles formation with flatwise sticking at the surface. The increase in biosorption with increasing temperatures indicates the exothermicity of the process which is further supported by positive values of S° and more negative values of G°. The First order kinetics studies for biosorption have been carried out and the kinetic parameters have been evaluated. ····· 10361135571
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This book Environ Pollution has been designed to present various aspects of pollution prevailing in the environment like noise, radiation, light and thermal pollution. Among the types of pollution, these are screaming the future. The material deals with the environmental pollution sources, hazardous effects due to pollution and the remedial measures to control these types of pollutions. This will help to create the awareness about the environmental pollution and give the ideas to control the environmental pollution. ····· 10361135545
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Biochemistry is the study of the structure, composition, and chemical reactions of substances in living systems. Biochemistry emerged as a separate discipline when scientists combined biology with organic, inorganic, or physical chemistry and began to study such topics as how living things obtain energy from food, the chemical basis of heredity, and what fundamental changes occur in disease. Biochemistry includes the sciences of molecular biology immunochemistry neurochemistry and bioinorganic, bioorganic, and biophysical chemistry. ····· 10361135534
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Utilisation of groundwater is steadily growing in many parts of the world to cope up with the increasing demand in various water user sectors. However scientific use of the precious groundwater calls for proper planning which involve modeling of the system. Recently for groundwater system planning and management use of soft computing tools is growing since these are found better than conventional numerical optimisation technique. Since groundwater problems involve non-linear objective function, their gradient with respect to parameters cause numerical instability. Simulated annealing, artificial neural network and genetic algorithms help in assessment of near global optimal solutions which are meaningful for real system simulation. Synthetic aquifer problems considered in the presented book are particularly useful to demonstrate the application of SA, ANN and GA to assess the aquifer system parameters. However when properly understood from the given applications these can be meaningfully applied to real problems. ····· 10361135527
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Adsorption of cephalexin.H2O on the surfaces of activated carbon and bentonite (which is provided locally in Iraq) was studied. The purpose of the study is searching for surfaces that are highly applicable of adsorption this compound which, taken in highly dozes, their results are some cases of poisoning. This study uses UV-Visible spectrophotometry to know the quantity of adsorption of these compounds on the employed surfaces at different conditions of temperature, pH, Ionic strength, quantity adsorbed, and particle Sizes. The shape of the isotherm obtained from the adsorption of cephalexin.H2O on bentonite and activated carbon was found to be comparable in all cases to the Freundlich and Langmuir equations was similar to S4-curve and L4- curve type according to Giles classification.The capacity of the adsorbents to adsorbing the cephalexin.H2O is in the following order:- Activated carbon Bentonite The kinetic and thermodynamic parameters of adsorption will be calculated. The thermodynamic functions enthalpy H, Gibbs free energy G and entropy S were calculated and were explained in the mean of the structure formula of the adsorbents. ····· 10361135432
für 49.00€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Wie wurde und wird das Thema `Chemikalienpolitik` in der deutschen Politik diskutiert Der vorliegende Quellenband enthält die Protokolle der im Deutschen Bundestag zur Thematik gehaltenen ungekürzten Reden ab 2001 (14. Legislaturperiode). Diese parteiübergreifende Dokumentation ermöglicht dem Leser einen direkten Blick auf die parlamentarische Debatte zum Thema `Chemikalienpolitik` und die Diskussionen der Abgeordneten im politischen Tagesgeschäft. ····· 10361135070
für 29.00€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Wie wurde und wird das Thema `Chemiewirtschaft` in der deutschen Politik diskutiert Der vorliegende Quellenband enthält die Protokolle der im Deutschen Bundestag zur Thematik gehaltenen ungekürzten Reden ab 2003 (15. Legislaturperiode). Diese parteiübergreifende Dokumentation ermöglicht dem Leser einen direkten Blick auf die parlamentarische Debatte zum Thema `Chemiewirtschaft` und die Diskussionen der Abgeordneten im politischen Tagesgeschäft. ····· 10361135068
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray From last few decads world is looking for the substituents of conventional sources of energy. The science community is looking for sustainable, reliable and economic sources of alternate energy. The present book is giving a method of convert and storage of solar energy. There are number of ways to convert the solar energy into less diffuse, utilisable and useful form. The author has selected the photogalvanic conversion path. After a prolonged research work in the field, the author is explaining the facts, myths and methods to harness this energy. The present book is based on the method which exposed the electrodes in two different conditions one in which cell placed in dark condition and second solar light exposed condition. The book is the tool for the fellows who want to harness the solar energy by the photochemical process. ····· 10361134549
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In energy sector alarming crude oil situation compel us to think many alternative energy sources. Biomass is generated in huge mass but is varied nature and characteristics conversion efficiency is also relatively very low. Under the circumstance scientists have advocated the employ of plant energy. Out of these plants some of the selected plants like Jatropha have been tried with some degree of success. Although Simarouba is on trial stage yet its potential appears to be of massive utility to be used as biodiesel. As the topic of the book indicates the most important aspect associated is to under take critical analysis of such plant seed. This is through process of optimization which depends upon transesterification .Our results indicate that economic consideration compels us to undertake blending as a useful tool to reduce cost of application and usage as alternative fuel under different situations. The prime objective of this research is to highlight the application and potentiality of Simarouba. This analysis reinforces the convincing thought that plant energy is the alternative available as on data which can be controlled in terms of its production & utilization as Fuel ····· 10361134540
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Biosorption has been recognized as an effective method of reduction of fluoride contamination in surface water and aqueous solutions. Biosorption can be defined as the removal of fluorides, metals, compounds and particulates from solution by biological material. Biosorption of fluorides from aqueous solutions is a relatively new technology for the treatment of wastewater. In the present study, the fluoride removal potential of calcium alginate (CA), chitosan coated calcium alginate (CCCA), chitosan coated perlite (CCP), chitosan coated silica (CCS), perchloric acid cross linked calcium alginate (PCA) and glutaraldehyde cross linked calcium alginate (GCA) beads is investigated by both batch and column studies. Further the biosorbents are characterized by FTIR, SEM, TGA, XRD, porosity and surface analysis to understand the mode of fluoride-biomass interaction. The basic objective of the study is to contribute to the understanding and modeling of the equilibrium adsorption process. ····· 10361134222
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Recent contamination of food by the use of melamine has led to huge economic losses in the food industry. Food and drug administration (FDA) currently uses methods that are laborious and time consuming. As a consequence scientists have been grappling with development of methods that are more efficient and cost effective for trace analysis of various food adulterates. One such method is the use of silver nanostructures in the presence of Surface Enhanced Raman spectroscopy that are capable of generating high enhancement of the signals, leading to low detection of the signals from the analyte. In the book, a literature review of the various synthesis methods, purification of the end products,assembly of nanostructures on glass templates as well as characterization of silver nanowires/nanoparticles and their potential use in Surface Enhanced Raman Spectroscopy is suggested. ····· 10361134206
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray A university being a higher institution of learning must have all the resources available. Unfortunately, in many universities especially in third world, the standards have gone down due to a number of reasons, principal among them are (a) Unavailability of learning resources: A lot of concern has centered on the dwindling leaning sources in university libraries to the extent that students have to rely only on the lecturers notes. This has greatly affected the learning and even the teaching process (b) Outdated learning materials: In most university libraries, there are few textbooks available and in most cases these are outdated. This book is an attempt to address in part some of the problems. It is prepared in a simple-to-understand language with many worked out examples in topics which students have the most problems. ····· 10361134162
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Phenolics have been found to possess potent biological activities including hypolipidemic, anticancer, anti-HIV, anti-malarial and anti-asthmatic activities. Similarly resveratrol, a trihydroxy-(E)-stilbene has been shown to act as an effective AhR antagonist and is in advanced stage of clinical trial for treatment of various cancer. Similarly neolignans show antioxidant and cytotoxic activities (such as podophylotoxin shows anticancerous activity). Besides their pharmacological importance, phenolics are also widely employed as flavors, pigments, and nutritional components in the food industry. Out of all antioxidant activity is one of the most frequently explored. Consequently, the development of environmentally friendly approaches towards bioactive molecules is the need of the hour. In this context, the realm of Green Chemistry becomes highly relevant. The goal of green chemistry is to create better, safer chemicals while choosing the safest, most efficient ways to synthesize them and to reduce wastes and seeking greener solvents that are inherently environmentally and ecologically benign . This Green Chemistry approach has been employed for the current synthesis. ····· 10361134129
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Lead is one of the heavy metals that have been associated with a number of health hazards with such effects as abdominal pains, constipation and loss of appetite, nausea, vomiting, insomnia, headache, irritability, dizziness and lead encephalopathy.In this publication the environmental factors responsible for the elevation of human blood lead levels have been identified: They include smoking, traveling, use of glazed ceramics, working or living near industries using lead, and residing near busy highways. On the other hand feeding on rich calcium, zinc, and phosphorus diets have been shown to mitigate the lead levels in human blood. The following foods therefore, were found to lower the lead levels in human blood groundnuts, beef, beans, milk, sorghum, millet,and eggs.The metal levels were determined using Atomic Absorption Spectroscopy and Differential Pulse Anodic Stripping Voltametry while UV- Visible Spectroscopy was used to determine the level of phosphorus in the human blood The publication is useful to environmental scientists, nutritionists and other stakeholders in pollution mitigation. ····· 10361134120
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Chemistry is the basic subject whose principles are applied in all fields of science. To understand basic concepts of the subject understanding the chemistry part is equally essential. This book is specially designed for undergraduate students of different disciplines.It explains the fundamental concepts of chemistry in a very effortless manner. The book is written in a lucid, precise and systematic way. It explains the basic concepts of bonding, reaction rates,chemistry of engineering materials, Instrumental methods of analysis and Fuels and Lubricants ····· 10361134062
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The practice of medicinal chemistry is devoted to the discovery and development of new chemical agents for treating disease. Most of the activity in this discipline is directed to the search of new natural or synthetic organic compounds. The present work emphasizes the synthesis of novel derivatives of benzotriazolothiadiazolyl thiazolidinones having three nuclei in combination with each other (viz. Benzotriazole, Thiadiazole and Thiazolidinone) along with their antimicrobial activity. The structure of synthesized compounds has been established on the basis of their physico-chemical properties and spectral data (I.R. and N.M.R. spectroscopy). ····· 10361133828
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Heavy metal pollution is a great concern to many around the globe today. These metals cause untold harm to millions around the world. There are various ways of removing heavy metals from industrial and agricultural effluents, but these are either too complicated or expensive to benefit all. This research work outlines a simple and inexpensive way of removing copper from waste water. It details a research work carried out in Africa which has a lot of industries and entrepreneurs who lack the ability to pay for the popular but expensive waste removal procedures. The method is well outlined. The research follows established isotherms like Langmuir, Freundlich and BET. The materials and reagents used are readily available. It is hoped that this work will greatly help in the reduction of the pollution of our bodies of water especially the reduction of copper pollution. ····· 10361133825
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The need of monitoring and controlling the concentration of heavy metal ions such as Pb(II) or Cd(II), which have toxic effects on all living organisms inspires chemists to synthesise more and more selective compounds able to recognize and to bind such metals. This book presents a review as well as the own researches on synthesis and binding abilities of calix[4]arene-derivatives, such as amides, hydroxamates and their thiocarbonyl analogues. The theoretical bases of the methods used to study ligand-cation interactions, such as 1H NMR spectroscopy, X-ray diffraction, liquid-liquid extraction, UV absorption spectrophotometry, potentiometry and microcalorimetry are described and followed by the own results and discussion. The last part of this book is ascribed to studies of ionophoric properties of calix[4]arene-thioamides and calix[4]arene-hydroxamates in ion-selective membrane electrodes. The results are followed by a short theoretical introduction to ion-selective electrodes. The description of the most important analytical methods used in supramolecular chemistry together with the data interpretation, may serve as a guide for those working in this field of chemistry. ····· 10361133820
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Basil (Ocimum basilicum) is known locally in Sudan as rihan . The plant is aromatic and exists in Sudan as a wild plant, widely spread, as well as cultivated for ornamental purposes. There is no use for basil herb in Sudan. The main objectives of this study, to analyze the chemical constituents of basils especially essential oil components accordingly, it will be possible to classify Sudanese basils according to the world-wide known classifications and to investigate some biological activities of basil oils. The seed (fixed) oil is another economic product from basil plants since this oil has potential industrial uses. However, Sudanese basils have so far not been chemically evaluated or investigated to determine essential oil composition and subsequently classify Sudanese basils into chemical groups or profiles in order to suit world market requirements especially if ever basil is to be commercially produced in Sudan as an agricultural crop for export. Such classification will help in selecting the right cultivar to grow for a specific market and knowing the oil constituents will help to identify the end use of the oil, as food flavours or for biological activity. ····· 10361133786
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This book is an introduction to carbon nanotube synthesis and properties working principles of supercapacitor and lithium-ion battery as well as the applications of carbon nanotube film in various electrochemical energy storage devices. In Chapter 2, a simple method to fabricate tandem structure of porous silicon film on carbon nanotube film to significantly improve cycling stability of silicon film as lithium-ion battery anode material was demonstrated. With the new structure, both reversible specific capacity and cycling stability are remarkably improved. Carbon nanotube films also exhibit a promising application in stretchable supercapacitors based on buckled carbon nanotube film electrodes for unusual power source applications in Chapter 3. The stretchability depends on the level of pre-stain applied on the PDMS substrate, which could be as high as 30%. This stretchable supercapacitor just enlightens a broad area of stretchable energy storage devices, which are naturally compatible with the developed stretchable electronics. ····· 10361133713· 1 · ::::: · 5 ·· 6 ·· 7 ·· 8 ·· 9 ·· 10 ·· 11 · ::::: · 26 ·
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