····· lezzter Preis 71.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Chemical engineering is the branch of engineering that deals with physical science and life sciences ( biology, microbiology and biochemistry) with mathematics & economics, to the process of converting raw materials or chemicals into more useful or valuable forms. In addition, modern chemical engineers are also concerned with pioneering valuable new materials and related techniques which are often essential to related fields such as nanotechnology, fuel cells and biomedical engineering. Chemical engineers use chemistry and engineering to turn raw materials into usable products, such as medicine, petrochemicals and plastics. They are also involved in waste management and research. Both applied and research facets make extensive use of computers. A chemical engineer may be involved in industry or university research where he or she is tasked in designing and performing experiments to create new and better ways of production, controlling pollution, conserving resources and making these processes safer.chemist may be involved in designing and constructing plants as a project engineer. This book explains the chemical engineering with the help of 7 different units. ····· 1036125428
····· lezzter Preis 54.90€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This book is about the `practical and theoretical chemistry examinations` composed by Leoncia H. Kibani, which offers comprehensive research results on their relationships. The study was done in Tanzania mainland in secondary schools. The study examined the weight given to practical assessment as compared to theory and overall performances. Through qualitative and quantitative approaches the study analyzed the data through Pearson correlation coefficient. Study findings revealed that there is a strong positive correlation daily practical practice in classrooms and final examination results. Furthermore, results indicate that practical are not assessed effectively as theory and they are not valued. The study recommends that practical work should be valued and assessed parallel to theory. ····· 1036125284
····· lezzter Preis 53.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In recent years, a great interest has been devoted to strongly correlated systems containing perovskite building blocks. These systems exhibit a complex interplay between charge, spin, orbital and lattice degrees of freedom paving the way for very attractive applications. `Diffraction Studies - Strongly Correlated Perovskite Oxides presents several applications of x-ray diffraction techniques to investigate the coupling between the structure and the physical properties of several bulk materials based on perovskite structure. The book is organized in five chapters. Introduction presents a very general overview on strongly correlated perovskite oxides while the first chapter reports technical details of the techniques involved. The following chapters report examples to show how diffraction can be used to assign the correct space group, to demonstrate the existence of hidden coupling between structural phase transition and magnetic, metal to insulator transition or to provide evidence of mismatch between the local and the average crystallographic structures. ····· 1036125209
····· lezzter Preis 44.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The coherent body of research described in published work is concerned with new assay method development and validation using novel systematic approaches for pharmaceutical and diagnostic compounds. The first stage of the research was to study how analytical method development and validation are typically carried out at present and to formulate this into a simple step-by-step approach. Such a template and protocol was not only used as the foundation of this research programme but could also serve as a simple systematic guide for other practitioners and those new to the field. Furthermore, it was recognised that this protocol should satisfy the requirements of the most strategically important regulatory agencies. The second stage of this research involved evaluation and application of the above validation approach to new methods that were developed for a diverse range of analytes using HPLC, LC-MS and GC. In essence, the critical review of the requirements for method validation for various agencies and the subsequent preparation of guidelines on how to go about method validation have had a significant impact on analytical practitioners worldwide. ····· 1036125193
····· lezzter Preis 44.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The importance of cephalosporins and the continuing introduction of new drugs of this series have prompted many researches to explore methods for their determination. Cefadroxil, one of these drugs, is the target in the present work. Most of the reported methods of analysis of cefadroxil are time consuming, lacking selectivity, require sophisticated equipment or not simple for routine analysis. For instance, the most widely used technique for its determination is liquid-chromatography. Therefore the need for a fast, sensitive, simple and selective method is needed, especially for routine quality control analysis of pharmaceutical products containing cefadroxil. The penicillins and the cephalosporines share a common structural feature that makes them determined by the proposed method. In this study, simple spectrophotometric method was developed for the assay of cefadroxil in bulk and pharmaceutical dosage forms. The validity of the method for the determination of cefadroxil in bulk form and capsule form was assessed by statistical comparison of the results with those obtained by the official HPLC method. ····· 1036125160
····· lezzter Preis 44.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The Chemistry of Sulphur and analogues in the environment has taken in a new significance in recent years due to its involvement in the formation of atmospheric aerosols and its impact on acid precipitation, human health and in the radiation balance of the atmosphere. The world oceans play a significant role in the transport of Sulphur compounds from marine, coastal and estuarine environments to the atmosphere. A benchmark study of Sulphur compounds in the marine environment of Cochin was carried out giving emphasis to their role in the redox status of estuarine sediments. An attempt to decrease the sulphur content of the marine sediments was done using phytoremediation technique. ····· 1036125154
····· lezzter Preis 53.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The book deals with studying the quantification of some investigated pharmaceutical drugs using three different techniques. Some azo compounds involved in spectrophotometric method as reagent to form stable complex with drugs as ion-pair complex in buffer solutions of different pH values. The book deals also with the determination of investigated pharmaceutical drugs with ion selective membrane sensors, The potentiometric method used has the advantage of application in turbid and coloured solutions and gives accurate results without any pretreatment steps. The studying deals also with the quantification of investigated drugs in various pharmaceutical preparations using regular HPLC-UV system and determination of OXO-HCl in human plasma samples using micro-capillary µHPLC-SPE-MS, the results give a highly selective, sensitive, rapid, and direct method for determination of drugs in pharmaceutical preparations and human plasma. The proposed methods can be used as alternative methods to the reported ones for the routine determination of pharmaceutical forms. This encourages their successful use in routine analysis of drugs under study in quality control laboratories. ····· 1036125078
····· lezzter Preis 71.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The gas sensing mechanism is based on conductance of the ferrites. The oxygen adsorbed on the surface of the material influences conductance of the ferrite. The amount of oxygen on the surface of the material depends on the particle size, specific area and operating temperature of the sensor. The interaction between the sensing material and gas to be detected determines the gas response. Generally, photocatalytic degradation of organic compounds includes various processes. An electron is excited from the valence band to the conduction band (CB) of metal oxides by absorption of light with energy equal to or greater than the band gap of the semiconductor. The separated photoinduced electrons and holes transfer to the semiconductor surface efficiently. At the surface, electrons react with acceptors (usually O2 dissolved in the solution) to produce oxidant species, for example hydroxyl radicals. Meanwhile, holes react with donors (H2O, OH ) to produce oxidant species. Oxidant species produced from electrons and holes have strong oxidizing abilities and can directly oxidize organic compounds into CO2 and H2O. ····· 1036125015
····· lezzter Preis 61.20€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In the present book, an attempt has been made to remove heavy metals like copper and nickel from plating discharge water in industries and how this waste water can be reused.Ion exchange method is the solution of heavy metals removal from waste water and can often use and easy to investigate the result in laboratory and industries.waste water effluent from different plating industries of Ahmadabad region(India) have been selected.The resin named Dowex M 4195 have been selected for the removal of metals.Parameters like adsorption equilibrium,initial concentration, effect of pH, effect of resin dosage, effect of contact time have been investigated intensively.Standard parameters can be developed for column chromatography to remove some heavy metals from industrial waste water and can make filter plantation for metals removal from waste effluent. Thus it may be possible to reuse for industrial purpose or other domestic uses. Metal are harmful for human beings and causes pollution of soil. If we can remove them really, it will major help for survival of green and clean earth. ····· 1036125000
····· lezzter Preis 44.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In search for newer analytical techniques that can meet the growing trend in the world of elemental analysis, the Inductively Coupled Plasma (ICP) system is exploited. A cursory look at the driving forces behind this analytical tool and its use in series with other analytical tools with reference to some literature reports has been critically reviewed. Aspects of maintenance of the ICP system and metal speciation were also highlighted. ····· 1036124984
····· lezzter Preis 71.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The flora of Jammu & Kashmir is very rich in medicinal plants. The bulk of population in Sub-continent as well as Kashmir, particularly those living in rural areas relay on the indigenous system of medicine for obtaining medicinal relief. The wide popularity of herbal concoctions bears testimony to the fact that many of them may possess significant biological activity and need to be studied in depth with respect to their chemical constituents. The present work describes the phytochemical investigations of two medicinal plants. The isolated compounds were subjected for different biological activities. Some of them were found very active. Whereas the Part-B deals with the synthesis of anti-tumor topopyrone C and its related anthrapyranes via Marschalk reaction. ····· 1036124721
····· lezzter Preis 76.90€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Di- and tri-organotin(IV) carboxylates of the type R2SnL2 [R = CH3, n-C4H9, n-C8H17] and R3SnL [R = CH3, n-C4H9, C6H5, where L= oxygen donor ligand, have been synthesized and characterized by various analytical techniques such as elemental analysis, FT-IR, NMR (1H, 13C) and single crystal X-ray analysis. The synthesized complexes were screened for their catalytic activity in synthesis of biodiesel-an alternative fuel, and biological activities such as antibacterial, antifungal and cytotoxicity. The triorganotin(IV) complexes exhibited comparatively higher catalytic and biological activities than their diorganotin(IV) analogues. DNA interactions studies of the ligands and synthesized complexes were also investigated and the results showed that both ligands and complexes interact with DNA via intercalation as well as minor groove binding. ····· 1036124650
····· lezzter Preis 71.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Capillary electrophoresis (CE) is slowly becoming a mainstream analytical technique. This book highlights several unique studies of CE for the determination of drugs. The lack of sensitivity of the CE technique is overcome by the use of an innovative liquid-phase microextraction technique for the trace determination of the anti-diabetic drug, rosiglitazone in biological fluids. For non-chromophoric compounds, the use of the capacitively coupled contactless conductivity detector offers an interesting option. This is demonstrated in the determination of the -blocker drugs (atenolol, chlorthalidone and amiloride), the antiviral drugs acyclovir and valacyclovir and their major impurity (guanine) in pharmaceutical preparations. The separation of the enantiomers of both ofloxacin and ornidazole or modafinil are also described. The computational calculations for the enantiomeric inclusion complexes for a few of these drugs and binding constant measurements were also measured. This book will provide researchers, students, chemists, pharmacists, and scientists valuable insights into the fundamentals and applications of CE in drug analysis. ····· 1036124648
····· lezzter Preis 44.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray During the last decades, dealing with the increasing amounts of industrial non-biodegradable disposals polluting the environment has emerged as one the major concerns of researchers, as well as ordinary public associations. Since, biodegradable polymers produced from nontoxic materials, become increasingly noticed as replacements of conventional non biodegradable petroleum-based plastics. This book, therefore, provides a new class of environmentally friendly biodegrabale nanocomposites of polycaprolactone-chitosan-layered silicate with enhancement in mechanical and thermal properties. ····· 1036124524
····· lezzter Preis 44.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Nowadays multiple drug resistance has developed due to the indiscriminate use of chemosynthetic drugs for the treatment of infectious diseases. In addition to this antibiotics are sometimes associated with several adverse effects after administration. This situation may have motivated scientists to search for new alternatives to chemosynthetic drugs, which have been found in herbs. Therefore there is the need to continually explore plant samples Exploitation of medicinal values and scientifically validating folkloric claims by those who locally use plants serve two important purposes: to discover candidate drugs of natural origin from the plants and also to justify their continued administration to human patients most especially in developing worlds. Such scientific evaluations will help to establish the safety margin in terms of dosage, toxicity and side effects. This book contains scientific investigation of the stem-bark of a selected Apocynaceae plant family s species (Adenium obesum).The work includes isolation of chemical compounds from the plant, structure determination of the isolates and testing of pharmacological activity of the plant extractives. ····· 1036124478
····· lezzter Preis 44.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Polycarboxylic acids and amines because of their building features are used for construction of building blocks of proton transfer compounds and also their complex networks with variety of metal ions of the periodic table. Various acidic ligands similar to PCAs are capable of forming strong hydrogen bonds and synthons subsequently. Among organic ligands and polycarboxylic acids such dicarboxylic acids which mentioned in the text, pyridine-2,6-dicarboxylic acid and its derivatives are a versatile chelating or bridging ligands. The experimental approaches and relative DFT calculations are also of great importance that show non-covalent interactions such as hydrogen bond and interactions are driving forces for the selection of different structures. DFT also estimates the binding energy of the involved non-covalent interactions and whole stabilization energy of related network. The purpose of this chapter was to determine the correct view and also examine the proton transfer compounds, water cluster and different studies in this research area. ····· 1036124473
····· lezzter Preis 71.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Effective membranes for Direct Alcohol Fuel Cell were prepared from two classes of materials. The first one is based on Sulphonated Polyetheretherketon (SPEEK) coated with Carbon Molecular Sieve (CMS) layers and the second class is based on SPEEK/Polyimide (PI) blends. Both approaches led a substantial reduction of Alcoholsol crossover through the membranes, when compared to plain SPEEK and to Nafion 117® membranes. The SPEEK/PI blends had better performance than CMS-coated SPEEK membranes in the DEFC tests. Particularly in DEFC experiments performed at 90 C the SPEEK/PI membranes had a better performance than Nafion 117® membranes due mainly to the effective reduction of ethanol crossover. ····· 1036124440
····· lezzter Preis 53.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This book focused on reduction of interferences in trace and ultratrace element analysis in highly interferring matrices using eletrothermal atomic absorption sepctrometery. A quick survey on interference problems accompained with the commercially available ETAAS and several developments like two step atomizers and filter furnaces to overcome these problems, then introducing the new T-shaped furnace design, principle and a new concept of high temperature chromatography with ETAAS for backgroung-Analyte signals separation to obtain more accurate absorption values. ····· 1036124425
····· lezzter Preis 71.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Compendio de experimentos de Química que pueden ser útiles para profesores de secundaria o bachillerato para trabajar con sus alumnos con objeto de mejorar los conocimientos de esta materia. Se indica la forma o formas en las que se pueden realizar y las cuestiones que se pueden plantear a los alumnos con el fin de que se fijen más en el fundamento y puedan entender la Química. Así los conocimientos adquiridos serán más significativos. ····· 1036124348
····· lezzter Preis 26.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray El polihidroxibutirato (PHB) es un poliéster, termoplástico, biodegradable, obtenido microbiológicamente. Es valorado como un material importante para usar en el campo médico, como matriz para la liberación de fármacos, en ingeniería de tejidos y en otros dispositivos médicos. Este material es moderadamente hidrofóbico, esto puede ser un inconveniente en sus aplicaciones, por lo que se hace necesario estudiar su modificación. En este trabajo se modifica el PHB con el injerto de poli (acetato de vinilo) (PVAc), que es un polímero más hidrofílico que el PHB, e introduce grupos de posible modificación posterior. Se utilizó el método de la irradiación simultánea. Se obtuvo un copolímero por injerto P (HB-g-PVAc) y se realizó la caracterización fisicoquímica del material por medio diferentes técnicas para determinar su estructura. Adicionamente se determinó en grado de injerto y las propiedades hidrofílicas del copolímero. ····· 1036123945
····· lezzter Preis 35.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Es importante ver al electrón como vector de sistemas que generen alternativas sostenibles y amigables con el medio ambiente, donde nos introduzcamos en conceptos y aplicaciones químicamente limpios, promoviendo y desarrollando una cultura y hábitos que orienten a hacer un planeta mas sostenible. La Oxidación Electroquímica de Aguas residuales, se convierte así en un referente en soluciones eficaces, que merece la pena tener muy en cuenta, ya que logra dar respuestas eficientes a una diversidad de situaciones que hasta ahora solo prescindían de costosos tratamientos, con el correspondiente desánimo que generan, desprendiéndose temas como multas, sobre costos y proyectos con bajos resultados. Acá lo que se pretende como tal es ofrecer un granito de arena a los tratamientos convencionales en cuanto a aguas residuales se refiere. ····· 1036123855
····· lezzter Preis 44.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray El Golfo San Jorge (océano Atlántico) se halla ubicado en la Patagonia Argentina, es compartido por las provincias de Chubut y Santa Cruz y es considerado un ecosistema altamente productivo. La zona está asentada sobre una cuenca petrolera activa desde hace más de 100 años, siendo la explotación de petróleo crudo junto con la pesca comercial y el turismo los recursos económicos más importantes para estas provincias patagónicas. En esta obra se presentan los resultados obtenidos al estudiar la contribución de los procesos fotoquímicos a la degradación ambiental de petróleo crudo y su atenuación natural en el ecosistema marino y costero de la Patagonia central. Se presentan condiciones para determinar en forma rápida y económica la presencia de hidrocarburos de petróleo crudo de la cuenca del Golfo San Jorge disuelto en agua de mar empleando espectroscopia de emisión de fluorescencia. Se han evaluado los principales factores que afectan la fotodegradación de la fracción soluble de petróleo en agua de mar, observándose que la fotooxidación es una vía importante para la degradación en el ambiente marino del petróleo de la cuenca del Golfo San Jorge. ····· 1036123842
····· lezzter Preis 49.00€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Los polímeros inorgánicos presentan propiedades únicas comparadas con aquellas de sus análogos orgánicos. Cuando se incorpora un metal de transición dentro del esqueleto polimérico, una rica variedad de diferentes números de coordinación y geometrías que son inaccesibles en los polímeros basados en el carbono aparecen disponibles. Así también se manifiesta la posibilidad de que haya actividad redox o catalítica y un acceso fácil a estructuras estables que posean electrones desapareados. En este libro se examinan las propiedades fotofísicas, fotoquímicas y morfológicas de polímeros inorgánicos derivados de la poli-4-vinilpiridina. En estos, el centro metálico es un complejo tricarbonílico de Re(I) que contiene una azina bidentada en su esfera de coordinación. Al irradiar los polímeros, la proximidad de estos centros en la estructura polimérica produce aglomeraciones de moléculas excitadas. La configuración particular de estos polímeros da lugar a un rico comportamiento fotofísico y fotoquímico sumamente distintivo del que se observa en los complejos de Re(I) no coordinados al esqueleto polimérico. ····· 1036123751
····· lezzter Preis 88.20€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Este libro presenta una visión panorámica de las aplicaciones farmacológicas de los complejos metálicos. Es una visión interdisciplinar que incluye, junto a la situación actual de la investigación en el campo, los resultados de proyectos conjuntos, intercambios y colaboraciones de los investigadores integrantes de la Red temática CYTED 209RT0380. Los capítulos abordan temas como: Complejos metálicos en la quimioterapia del cáncer Compuestos metálicos en el tratamiento de malaria, tripanosomiasis americana (enfermedad de Chagas) y leishmaniasis Compuestos inorgánicos como fármacos potenciales de la tuberculosis y la artritis Diabetes y compuestos de vanadio en su tratamiento Suplementación de metales esenciales Avances recientes de las queloterapias Investigadores y estudiantes en química de la coordinación, química bioinorgánica, bioquímica, biología, farmacología, oncólogos y otros médicos especialistas encontrarán en este libro abundante información sobre el enorme potencial que los compuestos de los iones metálicos pueden ofrecer tanto para el tratamiento de enfermedades muy extendidas como para aquellas aún no erradicadas presentes en muchos lugares del planeta. ····· 1036123659· 1 · ::::: · 17 ·· 18 ·· 19 ·· 20 ·· 21 ·· 22 ·· 23 · ::::: · 26 ·
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