für 45.80€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Cellulose ist der Hauptbestandteil der pflanzlichen Gerüstsubstanz und damit das am weitesten verbreitete natürliche Polymer mit einem faszinierenden Struktur- und Eigenschaftspotential. Bei der Baumwolle liefert die Natur die Cellulose bereits in Faserform und von relativ hoher Reinheit. Bei der Gewinnung der Cellulose aus Holz müssen zunächst Aufschlussprozesse erfolgen. Um Cellulose dann zu Fasern verarbeiten zu können, muss sie in einen löslichen Zustand überführt und nach dem Spinnprozess wieder ausgefällt werden. Die wichtigsten Verfahren zum Verspinnen von Cellulose sind das mittlerweile über 100 Jahre alte Viskoseverfahren und das aktuelle NMMO-Verfahren. Obwohl diese Verfahren sowohl mit ökonomischen, ökologischen als auch verfahrenstechnischen Nachteilen behaftet sind, blieben alle Bestrebungen, die Verfahren durch kosteneffizientere und umweltverträgliche Technologien zu ersetzen, bislang ohne Erfolg. Für die industrielle Umsetzung hat sich das Direktlöseverfahren von Cellulose in ionischen flüssigkeiten (IL) als am Vielsprechendsten herausgestellt. Im Rahmen dieser Arbeit wurden Untersuchungen zum Löseverhalten und dem Verspinnen von Cellulose in den Lösungssystemen N-Methylmorpholin-N-Oxid-Monohydrat (NMMOH2O), 1-Ethyl-3-Methylimidazolium-Acetat [EMIM] [OAc] und 1-Ethyl-3-Methylimidazolium-Diethylphosphat (EMIM) (DEP) gemacht und miteinander verglichen. Anschließend wurden die Strukturparametr, d.h. übermolekulare Ordnungszustände sowie die textilphysikalischen Eigenschaften, der nach dem NMMO-Verfahren und IL-Technologie hergestellten Regeneratfasern bewertet. Anhand der experimentellen Daten konnten dann wissenschaftliche Grundlagen zur IL-Technologie geschaffen werden, die eine technische Umsetzung zur Herstellung von Celluloseregeneratfasern aus IL ermöglcihen sollten. Aufbauend auf den erarbeiteten Grundlagen zur Verarbeitung von Cellulose in IL wurden anschließend homogene Cellulose/Polymer-Regeneratfasern in unterschiedlichen Mischungsverhältnissen hergestellt und mit Hinblick auf ihre Eigenschaften und Anwendungsmöglichkeiten eingehend untersucht. Als Polymere dienten dabei m-Aramid sowie Polyacrylnitril. ····· 10361107269
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Because of increases in industrialization and population, Biofuel presents a suitable renewable substitute for petroleum based diesel. It is a non- petroleum based fuel that generally consists of fatty acid methyl esters (FAME) derived from the transesterification of triglycerides (TG) with methanol and ethanol. Unlike homogeneous, heterogeneous catalysts for biofuel production is an emerging field of research which has been gradually growing during the last year. This text points to the potential of rape oil methyl ester as alternative biofuel. Gas chromatography (GC) analysis has proven to the most appropriate method, however GC-MS used for qualitative analysis and assessing the extent of conversion. Every unit gives basic concept of transesterification, catalysis, research methodology etc. This book written for those who are really interested in future renewable energy, petrochemical industry, and chemical engineering and heterogeneous - catalysis. It ought to be compulsory reading for intending or actual postgraduates, for academic-research staff of chemistry, future energy (oil and gas). ····· 10361103000
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Meat and dairy products are expensive and therefore attractive targets for adulteration. In recent years, many large food fraud scandals have been revealed. This means that both commercial and governmental laboratories have increased their focus on food authentication tests. This book includes an introduction to food authentication, a review of about 100 up to date analytical authentication methods used for meat and dairy and a short discussion on the specific methods: species determination, sex determination and whey protein determination in casein co-precipitate. The aim is to describe the best analytical methods available within physical, chemical and biochemical techniques. Most known fraud problems are addressed, and the book contains tables that enable the reader to easily find possible analytical methods to specific problems. The book can be useful to both students and professional food analysts who need up to date information about analytical food authentication. ····· 10361102950
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Arachis hypogaea (peanut or groundnut) is an economically important crop. Thousands of peanut cultivars are grown in the world and many studies have been carried out on them but, to the best of our knowledge, no salient work has been done on Pakistani cultivar so far. Here, we report the chemical composition of Pakistani cultivar of Arachis hypogaea (peanut or groundnut) and its antiradical activities by 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging and Phosphomolybdenim Complex (PC) method. This study revealed that Pakistani cultivar exhibited an almost equal antioxidant potential to that of Butylated hydroxytoluene , which was obvious from the IC50 values. ····· 10361102850
····· lezzter Preis 44.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The old days of easy-going attitudes to laboratory safety and teaching are over. In addition, there is a clarion call to bridge the gap between theoretical and practical aspects of chemistry and other sciences to make them appealing to the younger generation who are gradually loosing interest in science-related disciplines. The overall objective of this handbook is to introduce a comprehensive overview on the fundamentals of laboratory teaching and safety for laboratory workers in the chemical sciences as well as other personnel in the allied sciences. Two unique features are evident in this handbook. First, the book presents the how of laboratory teaching. It is not intended to be a cookbook that presents a set of instructions to be followed by the laboratory instructor. Rather, self-appraisal, fundamental principles, and skill development required for effective laboratory teaching are detailed. Second, the book gives a lucid introduction to laboratory management, chemical safety and prudent chemical handling. Finally, remember, to teach is to learn twice. Enjoy the nuggets for effective lab teaching and safety practices. ····· 10361102787
····· lezzter Preis 35.90€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The antioxidant potential of Skimmia anquetilia and Dicliptera bupleuroides methanolic extracts and fractions was evaluated using the eight multidimensional methods. The accrue data presenting that TEAC and FRAP Value vary from 6.09-1.65mM, 7.04-2.03 for S. anquetilia and 3.5-0.4, 3.8-1.8 respectively for D. bupleuroides. Phenolic content of S. anquetilia ranged from 3.04-0.4 gallic acid (mg/L) and 1.5-0.44 gallic acid (mg/L) for D. bupleuroides. S. anquetilia and D. bupleuroides Aqueous and organic soluble fraction were rich of flavinoids which was range from 1712.7-249.1 mg catchecin eq. and 885.4-107.2 mg catchecin eq respectively. Total antioxidant activity by phosphomolybdenum method was determined for various fraction of S. anquetilia and D. bupleuroides ranged from 0.555-0.09 and 0.42-0.17 respectively. The percentage of superoxide anion radical scavenging ranged from 99.5 to 4.96 for S. anquetilia and 78.4 to 68 for D. bupleuroides. The percentage bound Iron in S. anquetilia fraction was varying from 73.5 to 61.9 and 94.8-69.2 for D. bupleuroides. The amass results of indicated that S. anquetilia and D. bupleuroides is a rich source of natural antioxidants. ····· 10361102582
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Drug Impurity Profiling: The need to develop new analytical methods for assurance of quality, safety and efficacy of drugs and pharmaceuticals is quite important because of their use not only as health care products but also life saving substances. The analytical methods assume of great importance due to i) development of new drugs ii) continuous changes in manufacturing processes for existing drugs and iii) setting up of threshold limits for individual and total impurities of drugs by regulatory authorities. Keeping this in view, an attempt was made in the present investigation to develop new analytical methods for some of the important drugs and pharmaceuticals of 1-adrenergic receptor antagonist, antidepressants, cardiovascular agents, antioxidants and tuberculostatics in nature. All the methods described in the book are simple, rapid, reliable and validated. The methods could be used not only for quality control but also for process development of bulk drugs. The work carried out in the present investigation was described in six chapters. ····· 10361102456
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The reliable identification of compounds such as illegal growth promoters in animal or human is generally based on expensive gas chromatography-mass spectrophotometry analysis, a method that does not allow on a large-scale screening. The use of simple, semi-quantitative electrochemical biosensors may provide a means of screening for the presence of compounds such as illegal growth promoters (ie. steroids). A detail development of such kind of Bio/immunosensor has been described in the first three chapters of this book. Four and fifth chapter of this book investigated a comparative study on the use of a glassy carbon, screen printed carbon and carbon fibre as sensor material to detect p-aminophenol. This book will be an important collection for a University student, early stage researchers, advanced level researchers and veterinary scientist who are working in the area of Bioscience or Biotechnology. ····· 10361102323
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray For thousands of years, Eastern cultures have revered mushrooms health benefits. Mushrooms have long been celebrated as a source of powerful nutrients,. Often grouped with vegetables mushrooms provide many of the nutritional attributes of produce, as well as attributes more commonly found in meat, beans or grains. Mushrooms are low in calories, fat-free, cholesterol-free and very low in sodium, yet they provide important nutrients, including selenium, potassium, riboflavin, niacin, vitamin D and more. Nutrient Composition : The focus on the nutritional value of brightly colored fruits and vegetables has unintentionally left mushrooms in the dark. Mushrooms provide a number of nutrients: Mushrooms are a good source of B vitamins, including riboflavin, niacin, and pantothenic acid, which help to provide energy by breaking down proteins, fats and carbohydrates. B vitamins also play an important role in the nervous system. Pantothenic acid helps with the production of hormones and also plays an important role in the nervous system. Riboflavin helps maintain healthy red blood cells. Niacin promotes healthy skin and makes sure the digestive and nervous systems function prope ····· 10361102321
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Activated carbon is material of choice for adsorption of fluoride and heavy metal ions from aqueous media due to its easy availability and low cost. Activated carbon are characterized by standard methods.Batch experiments is more effective. The dependence of important factors like dose,contact time,pH, common ions and temperature studies were examined.The adsorption is also explained in terms of Intra particle diffusion and isotherm. SEM and XRD are used to study the surface morphology. Further this study has unearthed another facet of indigenous materials as effective adsorbents for removal of fluoride and heavy metal ions. ····· 10361102199
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray To enhance ecofriendly bulk utilization of Coal fly Ash(CFA) & to generate general acceptability towards this waste material along with other waste materials (water hyacinth/cow dung + grass cuttings) as input material in agriculture & related fields, the reported studies have been carried out selecting nine plants under climatic conditions in & around Kota city applying scientifically designed methods. Results are reported in the form of dose range highlighting positive outcome. The original thesis has been revised. Addition of CFA with soil alters its physical & chemical properties. By variation in applied proportion of bio modified ash desirable results can be obtained. The aim of the experiments was to find out most suitable conditions for initiating a reaction between the constituents of soil & CFA to upgrade the quality of soil to make it more suitable for cultivation of selected plants. It comprises details of physicochemical studies on application of biomodified CFA with organic wastes in the cultivation of selected nine plants. Present study provides a more economic method for the correction of top soil utilizing another waste, that is biomass waste. ····· 10361101982
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The nutritional quality of six new Nigerian plantain, banana and cassava bred by IITA were evaluated. These included carbohydrate, protein, fat, crude fibre, ash, and moisture content. Other traits evaluated were carotenoids as an index of vitamin A content, minerals, including calcium, potassium, magnesium, phosphorus, iron, and zinc. The shelf life of the flour produced from different varieties of plantain, banana and cassava were also assessed. This study also investigated the baking potentials of different Musa and Manihot species used. The study shows that the cultivars of plantain, banana and cassava investigated are rich in various nutrients and are therefore recommended for human consumption and also as important plants for breeding. Food products developed from various cultivars can also constitute important products for domestic and export markets. The cultivars investigated are therefore recommended for distribution to farmers in Africa in line with Federal Government of Nigeria and IITA policy on agriculture, NEPAD initiatives on agricultural development, and Food Security measures of the Millennium Development Goals. ····· 10361101783
für 32.31€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Welcome to a new and easy way of doing chemistry laboratory! Our focus in writing this handbook has been on developing highly readable experiments that will provide you with a successful learning experience. Our method for developing laboratories begins with the short information on safety rules, safety signs and safety equipment. From this, objectives are developed which are included in the beginning of each laboratory and which serve as a key focus point for all aspects of the given experiment. ····· 10361101705
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Fractal analysis has manifold applications. In fact it is easy to explore the world and grasp the irregular shapes and forms through fractal analysis. Fractal analysis, a discipline of Physics, despite having immense importance, is unfortunately not popular among the Chemistry and Biology students, due to lack of knowledge. For the development of profound understanding of fractals among chemists and biologists, it is essential to present concepts and models of chemical and biological fractals explicitly. This approach has been manifested in this book. This text provides a firm substratum for many facets of fractal analysis. The book is short, concise and provides essential knowledge about fractals and its peculiar incursion into other fields of Science. I am very grateful to Dr. Mahboob Muhammad, who gave me the idea about the fractal work. I acknowledge my debt to Dr. Iftikhar Imam Naqvi and my brother Farhan who have helped in various ways during the writing of this book. At last, I am very much thankful for encouragement, unending help and continuing support given by my husband throughout this work. ····· 10361101592
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Based on the recorded pharmacological potencies of numerous substituted pyrimidines as antihyperlipemic and antihypertensive agents, synthesis of condensed and spiro bis-heterocyclic systems oxazole-pyrimidines as well as pyrimido-oxazines bearing a phosphonate substituent was undertaken. The bioassay indicated that some of the products have effect on the central nervous system (CNS), and other products have good selective anti-tumor activity and the structure-activity relationship (SAR) of new phosphonates has also been indicated. In addition, a new class of C-glycosyl amino acids bearing a thiourea segment as a linker has been designed and synthesized by addition of glycosylmethyl isothiocyanates to an amine-functionalized amino acid. The orthogonal set of protective groups makes these compounds suitable substrates for the co-translational modification of natural peptides. The study included the synthesis of a set of new sugar isothiocyanates and their coupling with the alanine derivative. ····· 10361101534
····· lezzter Preis 61.20€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Conductive rubbers are being imported at a high cost. So the development of conductive rubbers in India is of prime importance. The primary aim of this work is the development of conductive silicone rubber, used for making conductive pads in telephone sets and calculators. The work envisages the comparison of conductivity and mechanical properties of silicone rubber and Nitrile rubber vulcanizates loaded with different amounts of conductive fillers. The effect of temperature is studied with the intention of generating conductive rubber, used for long-term and high temperature applications. Conductive nitrile rubber may be used where mechanical strength and oil resistance is needed along with electrical conductivity. Aromatic poly( azomethine)s are highly thermo-stable and possess a conjugated main chain and after doping, show electric conductivity . A new conducting polymer based on glyoxal and p-phenylene diamine poly(p-phenylenediaminedizomethine) - , which has high thermal stability is prepared. Blends of the newly prepared polymer with polyethylene, polyvinyl chloride, and silica was studied to improve the processability and to decreases cost of the conducting polymer. ····· 10361101514
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In the food industry, the brewery sector holds a strategic economic position with the annual world beer production exceeding 1.34 billion hectolitres in 2002. Beer is the fifth most consumed beverage in the world behind tea, carbonates, milk and coffee and it continues to be a popular drink with an average consumption of 23 liters/person per year. The effluent discharge by breweries is recognized as a significant environmental problem because of the considerable organic load created by the brewery processes. ····· 10361101004
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Modern trend is to prepare hybrid materials using nanoclays. Formation of nanoclay, exfoliated clay, proper dispersion in polymer matrix still remains a challenge. There are three specific problems to be dealt with at present. Aspect ratio of the clay particles must be very thin in cross section, present a large surface area in its flat dimension, serves the purpose of maximizing gas permeability. Clay particles that grow on aggregates must be broken down or exfoliated into individual sheets that have thickness of 1 nm. Particles must be compatible with the polymeric substrate. The objective of this work is to disperse clay using various dispersants using natural ones. The green hybrid material so formed by clay polymer matrix has many improved properties such as high Tg, high flame resistance, high tensile strength and improved barrier properties which may find application in textile industry, automobile industry, environmental and polymer engineering fields. ····· 10361100992
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Over the years, biodegradable polymers have gained mutual interests due to continual environmental pollution caused by non-degradable polymers. This book emphasises on the blending of biodegradable polymers, namely poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and oil palm empty fruit bunch fibers. The properties of the resulting blends and possible leached toxic chemicals from the biocomposites were studied. ····· 10361100986
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Nitrate reductase (NR) catalyzes rate-limiting and controlled step in nitrate assimilation in higher plants. This cytoplasmic enzyme responds to light/dark signals. Regulation of NR by light being complex is manifested through gene expression at transcription and translation, covalent modification and reductant supply. Past efforts have led to an understanding of covalent modification of NR via phosphorylation/dephosphorylation mechanism. This book includes in vivo and in vitro NR assay optimization and measurements in spinach during light/dark transition in presence and absence of Mg2+ and ATP alone and their combinations. In vivo NR activity declined gradually under dark with significant decline being noticed only after 60 min. Also, in vivo activity declined slowly up to 60 min of darkness in presence of Mg2+, the decline being slow in its absence. Decline of in vitro NR activity was not observed in presence of Mg2+ up to 30 min of darkness, but the activity declined gradually in presence of ATP up to 60 min of darkness. Further, considerable decline of in vitro enzyme activity was noticed after 15 min of darkness in presence of Mg2+ ions and ATP. ····· 10361100973
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Radiopharmaceuticals labeled with 99mTc represent the majority of procedures in Nuclear Medicine. Quality control of 99mTc radiopharmaceuticals is making by Tin Layer Chromatography (TLC) there are years. However, TLC is not sensitive enough to detect and quantify any impurities in the radiopharmaceutical. High Performance Liquid Chromatography (HPLC) is a selective and sensitive technique which has become indispensable for the quality control of 99mTc compounds. HPLC simultaneously detects and quantifies various impurities besides be used in analysis of raw material in the production of lyophilized reagents (LR). This book provides analytical methods for analysis of 99mTc-HSA, 99mTc-EC, 99mTc-ECD, 99mTc- Sestamibi and LR by HPLC. The reliability of the results is ensured by validating the analytical method and comparing the results with other methods. This book will be useful for chemists, physicists, pharmacists, radiologists, nuclear physicians and others who are envolved with Nuclear Medicine in hospitals, clinics and centers for research and prodution of radiopharmaceuticals ····· 10361100966
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The objective of the research activity being undertaken in this book is focused on creating superior materials with improved properties to overcome the drawbacks of using traditional materials and to offer a major opportunity for advanced applications. The subjects of this book have been directed towards three parts. 1) Preparation and characterization of reactive functionalized polymers and polymer-clay nanocomposites to produce materials with enhanced combined properties. 2) Applications of functionalized supports in organic chemistry to achieve the automation and simplification of the procedure work-up in technological and commercial processes. This attractive technique offers great promise for solving the problems of the conventional chemical reactions. 3) Applications of functionalized supports in agriculture to solve the economic and the environmental problems associated with the uses of conventional agrochemicals. The applications of reactive functionalized materials in controlled release formulations of agrochemicals have resulted in a new potentially important technology and methodology for achieving the greening of chemistry to meet appropriate environmental standards ····· 10361100886
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Heterobicyclic oxazolo pyrimidinone are important class of compounds. They may become promising candidates for exploiting more useful therapeutically active molecules. The compounds having oxazolo pyrimidinone moiety are associated with interesting wide spectrum biological activities, such as antibacterial, kinase inhibition, adenosine receptor antagonism, tumour growth inhibition and some show to inhibit the ability of ricin to inactivate the ribosomes etc. The intermediate azlactones are also useful precursors for the synthesis of amino acids, peptides, heterocycles, biosensors and antitumor or antimicrobial compounds. In the present study, it was proposed to synthesize lead molecules of oxazolo pyrimidinone skeleton, apt for binding to the target enzyme, bacterial MurB based on the rational approach and to study their docking simulations using ArgusLab 4.0.1 and AutoDock 4.2 softwares. The synthesized test compounds were then characterized by TLC, melting point determination, UV, IR, 1H-NMR and mass spectral studies and tested for their antibacterial activity and compare with the standard drug. ····· 10361100846
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Malaysia produces about 5 million metric tonnes of sewage sludge annually.The quantity of sludge is expected to increase every year and directly proportional to the increase in municipal wastewater that had to be treated.The use of sewage sludge as a fertilizer has not been practiced nor publicly accepted in Malaysia.Nevertheless, the application of sewage sludge to agricultural land is generally the most economical means of waste disposal and also provides an opportunity to recycle beneficial plant nutrients to soil for crop production.However, sewage sludge also contains varying amounts of heavy metals which may pose a hazard of metal toxicity to crops and the consumer of these crops.At present there are no guidelines or policies on land application of sewage sludge in Malaysia.Studies need to be conducted so that regulations and policies developed are based on scientific data. Therefore,this book provides an assessment on the feasibility of using sewage sludge as a fertilizer on agricultural land in Malaysia.Thus,the crop response, uptake of heavy metals by crops and the fate of these heavy metals in soils have been investigated and discussed in various chapters of this book. ····· 10361100833· 1 · ::::: · 10 ·· 11 ·· 12 ·· 13 ·· 14 ·· 15 ·· 16 · ::::: · 26 ·
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