für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The Research and Development of Ruthenium Organometallics(Ru OMC) emphasizes the survey of literature on Amide ligands,Ru(II)&Ru(III) precursors of current interest, aims and objectives and the systems investigated in the present research. Ru precursors were selected because of their structural, novelty and catalytic behavior. the increasing applications of Tryphenyl phosphines(PPh3) derivatives of Ru compounds as catalysts and starting materials in preparative chemistry insisted to select ruthenium precursors with phosphine ligands in particular and an amide ligands are formed because of diversified, coordinating behavior. This book mainly contains synthesis and characterization of Ru(II),Ru(III)OMC with coordinated ligands and their catalytic applications on selected pharmaceuticals, and are characterized by several spectroscopic techniques. the Ru OMC were selected to study catalytic activities based on the oxidation states of Ru availability of hydride ligands. Ru(III),Ru(II) OMC derived from their precursors are used in the applications of oxidation,reduction reactions on drugs containing alcoholic,nitro groups and also hydrolysis on drugs containing ester groups mainly. ····· 10361147273
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Multi-Walled Carbon Nanotubes (MWCNT) was used as Matrix Solid-Phase Dispersion (MSPD) sorbent for the extraction and preconcentration of four organophosphorus insecticides (i.e. malathion, malaoxon, isomalathion and fenitrothion) from four different commercial honey samples (Çaml belde Bal , Ankara Bali, Binbo a Bal and Balparmak Bal ). The developed method which involves MSPD, followed by evaporation of eluate through nitrgen gas and direct Flame Ionization detector analysis, was performed by dispersing 4:1(g/g) carbon nanotubes stationary phase on spiked honey sample and elution with 8:2 (v/v) hexane:acetone. The recovery values of insectecides were: 103.3 % for malathion with % RSD of 12.1, 96.5 % for malaoxon with % RSD of 10.9, 101.2 % for fenitrothion with % RSD 9.8 and 83.6% for isomalathion with % RSD of 11.1. standard addition calibration method was carried out for the honey sample matix using the standard mixture of the insecticides and slope of curves, were stitistically compared to slope of calibration curves constructed using pure solvent. Limits of detection was 7.0 ng/g for malathion, malaoxon and fenitrothion and 33.3 ng/g for isomalathion. ····· 10361147212
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This book presents synthesis and characterization of CNT/Polymer nanocomposites. CNT/Polymer nanocomposites are materials whose major component is a polymer and the minor component is CNT whose dimension is below 100 nm. CNT/Polymer nanocomposites have become an active field of research in recent years because there have been accounts of large property changes with very small addition of CNTs(less than 5 wt%). CNTs have been synthesized by Chemical vapor deposition (CVD) and Arc discharge techniques. Solution cast method has been adopted for the synthesis of CNT/Polymer nanocomposites. The thickness of composites is controlled by using the weight of polymer. Volumetric method has been adopted to fix the thickness (40 m) of the polymer and verified by ellipsometer. Polymethyl methacrylate (PMMA) and Polystyrene (PS) amorphous polymers as base polymers, MWNTs as filler in (0.01-0.05) wt% have been used. A systematic study of these composites have been performed by using X-Ray Diffraction (XRD), Raman spectroscopy, Fourier Transform Infrared (FT-IR) spectroscopy, Dynamic Mechanical Analysis (DMA), Optical microscopy and Scanning electron microscopy (SEM). ····· 10361147079
····· lezzter Preis 44.10€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This book provide valuable baseline information about the herbs and medicinal plants found in South Asian region especially in Pakistan.There are many benefits of herbs.Since ancient times, spices and herbs are used to treat illness.Still today more than 90% of world population relies completely on raw herbs and unrefined extracts as medicines. Herbs contain some anti-oxidants, essential oils, vitamins, and many other plants derived nutrient substances which help our body to fight against germs, toxins and to boost immunity level.Medicinal plants play an important role in the lives of rural people.Therefore, it is necessary to regulate the level of essential and trace metals found in these plants. ····· 10361147061
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This thesis summarizes the microbial transformation of two compounds, Estrone, a steroid and Cedryl Acetate, a terpene. The steroid, estrone (1) was transformed by two microbes, Cunninghamella elegans and Rhizopous stolonifer. When transformed by Cunninghamella elegans, two transformed products were produced including metabolites (2) and (3), one showed hydroxyl addition while other showed addition of hydroxyl group along with conversion of carbonyl group to hydroxyl group. Estrone also gave transformed products by Rhizopous stolonifer which are similar to that obtained by Cunninghamella elegans. The terpene, cedryl acetate (4) when transformed by Cunninghamella elegans gave three transformed products includes metabolites (5), (6) and (7), showed addition of hydroxyl group at different positions. ····· 10361147022
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The inability to shrink silicon based electronic devices has lead to increasing interest in the field of nano-electronics. The use of individual molecule as component in electronic circuits has been at the forefront of most nano-electronic research in recent years. The technology based on use of molecules as circuit elements could play a prominent role in extending the current silicon based devices beyond the projected limits of CMOS scaling. It has been shown that conjugated molecules with appropriate pendant groups and end groups are capable of showing interesting electronic properties like conductance switching and NDR (Negative Differential Resistance). Even though there has been substantial amount of work done in this area there still remains several knowledge gaps which needs to be addressed. This book discusses the electronic properties of conjugated molecules along with conductance switching and self-assembly of alkanethiols to make molecular electronic circuits. ····· 10361146931
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This book describes the synthesis and characterization of niobium-based metal complexes and their usefulness as catalysts for the polymerization of ethylene, norbornene, beta pinene and vinyl monomers. The polymerization of above described monomers was studied using niobium complexes based on N,N dialkylcarbamates, mixed chloro alkoxides, simple oxygen-containing ligands and the starting material for the preparation of such derivatives, i.e. NbCl5.Niobium N,N-dialkylcarbamates exhibited high activity for polymerization of ethylene when activated with TMA-depleted MAO and 1,2-dichloroethane as activator working at 1 bar ethylene pressure. These novel catalytic systems resulted very active in Ring-opening metathesis polymerization (ROMP) of norbornene (NBE)with the highest activity never reported up to now for any transition metal catalysts. The dinuclear niobium compounds and simple oxygen-containing derivatives of niobium pentachloride were tested for ethylene polymerization and produced satisfactory results.In this context, it was found that easily accessible NbCl5 works as an excellent catalyst for the polymerization of -pinene styrene and butylvinyl ethers. ····· 10361146877
für 71.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Aerosol Mass Spectrometry (AMS) has emerged as the principal tool for aerosol analysis and soft ionization techniques are an important subset particularly suited for chemical speciation investigations. This dissertation presents the use of soft ionization AMS for the analysis of complex organic aerosols in laboratory studies, both as models for Primary and Secondary Organic Aerosol (POA and SOA). An established technique (PERCI-AMS) is used to identify the resonance capture mechanisms for cysteine containing peptide residues. This technique is then applied to investigate the ozonolysis of mixed particles representative of biogenic rich organic aerosol as is common for marine aerosols. In order to apply soft ionization AMS to lower concentrations of particle mass more representative of ambient aerosol loadings and thus allow SOA investigations, an entirely new AMS technique was developed and is presented utilizing Near-Infrared Laser-Desorption-Ionization (NIR-LDI-AMS). The advantages this technique are exemplified by an analysis of limonene ozonolysis SOA whereby first generation homogeneous oxidation products are delineated from second generation heterogeneous oxidation products. ····· 10361146712
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Surfactants are important in our daily life because they were widely used in household products, cosmetic, food and pharmaceutical industries as emulsifier, wetting agent, cleanser, foaming agents, solubilizers, conditioners, thickener and also to produce emollients. Therefore, nature of the surfactants is relatively important and is expected to be human friendly as the surfactants will be directly contacted with human. In recent years, biosurfactants such as glycolipids have drawn a large attention in the industrial applications especially in cosmetic and pharmaceutical industries. In this book, sucrose fatty acid ester which is a non-toxic and human friendly glycolipid surfactant was used in the preparation of olive oil-based emulsions for cosmetic and pharmaceutical applications. The results provide the information on the effect of the emulsion droplet size to the stability and rheological properties such as viscoelastic and viscosity of the emulsions. ····· 10361146692
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The Computer industry is among the top world s largest and fastest growing industries.This has led to the massive generation of computer electronic wastes.Heavy metals are the major components of computer and are potentially toxic to human life,other living resources and the environment, especially when present in high concentrations.It became necessary to determine the levels of heavy metals found in these electronic wastes which often are littered in streets and dump-sites within Nigeria.The levels of Chromium and Copper contained in cathode ray tubes,and printed wiring boards in waste personal computers were determined.In the whole analysis,products from 40 different manufacturers were sampled mainly from Idea-Consult,a major computer dealer in, Nigeria while others were obtained from waste dump-sites and computer repairers.The metal concentrations of the pooled samples ranged from background levels to levels that suggested gross contamination.The analysis should help shed great light on the dangers of inappropriate disposal of e-wastes and induce the government towards developing environmental protection policies,while it provides awesome opportunity for recycling companies. ····· 10361146632
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The question of what is meat quality has conjured up many definitions including fitness for use, the ability to satisfy a need, and the degree of excellence at a reasonable price (Gray et al., 1996).Whatever the definition, some quality aspects appear to be relevant to most consumers. This quality attributes greatly affected by lipid and pigment oxidation. Understanding and controlling the processes which lead to color and lipid oxidation is a major challenge for meat scientists because of a greater demand ever by consumers for foods perceived as natural, fresh-tasting , healthy and more nutritious (Morrissey et al., 1998). Color and Lipid oxidation can be minimized by using either synthetic or natural antioxidants during the production process or incorporating in the conventional animal feed. ····· 10361146390
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In this research work a rapid reversed phase liquid chromatographic method was developed and validated for Sulphacetamide Sodium (SCS) and Prednisolone Acetate (PAC) in ophthalmic suspension. Chromatographic separation was achieved by using ammonium acetate buffer and methanol (0.02M pH 4.0) (30:70 V/V) at a flow rate of 1.5 ml/min. The effluent from column was monitored by means of Diode array detector at 271 nm and 245 nm for SCS & PAC. The retention time for SCS was 1.8 and for PAC was 3.6. A good linear relationship was observed over the concentration ranges 0.016-10 g/ml and 0.64-400 g/ml with correlation coefficient 0.9999 and 0.9999 for SCS and PAC respectively. Calculated LOD & LOQ were 15 ng/ml and 18 ng/ml and 46 ng/ml and 55 ng/ml for SCS and PAC respectively. All the excipients and degradation products were resolved in 6 mints with R ····· 10361146321
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In recent years there has been considerable interest in the study of lamellar systems, both the classical lamellar phase of planar sheets, and systems where the bilayer sheets fold to form a closed structures such as multilamellar vesicles. In this work a systematic study of a dynamic phase diagram at low temperature and a structural analysis along an isoplethal line has been performed. MLVs were prepared with different procedures and their stability analyzed at different temperature. Additionaly, several techniques were used to verify the presence of structural defects in the lamellae at low temperature. ····· 10361146317
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The present work describes polysaccharides based edible films for the purpose of using them as packaging material. The three biopolymers namely Chitosan, Cellulose acetate and Alginate were transformed into films and subsequently loaded with ZnO nanoparticles using different strategies. These films were investigated for water vapour permeability and moisture absorbency under different experimental conditions. The films were characterized by Thermogravimetric analysis, X-ray Diffraction, Differential Scanning colorimetery, Surface Plasmon Resonance, Transmission Electron Microscopy and tested for biocidal action against E-Coli as model bacteria. ····· 10361146269
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This book contains all advanced spectroscopic methods which are very very essential to identification of a chemical compound. This book will be useful to Master degree students of chemistry, food science, biochemistry etc. The content of this book is designed in such a way that it will be well suited to graduates and post graduate courses of all science disciplines. To carryout the analysis and identification of a new compound. ····· 10361146233
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Alkenes are important primary chemicals for supporting our daily life from domestic utilities to off-the-shelve drugs. Internal and monosubstituted alkenes preparation technologies are now practicing in modern industry at a large scale, however, further potentials may possibly bounded by the availability of low cost synthetic methodology to access new derivatives with better environmental issues awareness. This book begins with highlighting the key former distinguish achievements in the area of Ni-H chemistry with olefins, follows by providing rationale on how we come up a new idea that gives asymmetric terminal disubstituted olefins in a catalytic and greener way, how we overrides several key existing problems in the field and relieves the bottleneck situation between the chemical feedstocks and large varieties of value-adding olefin transformations. This book closes with detailing technical procedures for readers to pursue the chemistry easily. The presented conceptual advance and exciting development should be useful to R & D professionals in Petroleum Industry, Polymers and Fine Chemicals Companies or those who plan to use geminal olefins for subsequent synthetic applications. ····· 10361146189
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Cyano-bridged mixed valence compounds have been known to exist since 1704, but a lot of interest in the bi-nuclear and tri-nuclear species has emerged only more recently. The growing interest in these complexes is due mainly to their promising and useful applications in electrochromism, molecular magnetism and molecular electronics. These properties are activated by the excitation of their metal-to-metal charge transfer (MMCT) transition. This book characterizes aqueous solutions of the FeHEDTA / [Fe(CN)6]4- system which form intensely colored solutions that absorb strongly in the visible/NIR region of the electromagnetic spectrum. Typically binuclear (Fe(III)-Fe(II)) and trinuclear (Fe(III)-Fe(II)-Fe(III)) complexes are formed. Information on reorganizational parameters, electronic coupling between metal centers, molar absorptivities, equilibrium constants, and delocalization factors are discussed for binuclear and trinuclear Fe(III)/Fe(II) complexes, and compared to similar systems reported in the literature. This book is ideal for researchers in chemistry, physics, material science, and engineering. ····· 10361146178
····· lezzter Preis 39.90€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Der Chemiker, Physiker und Philosoph Wilhelm Ostwald (1853-1932) war Gründer und Herausgeber der für die Geschichte der Naturwissenschaften bedeutenden Sammlung `Ostwalds Klassiker der exakten Wissenschaften`. 1909 erhielt er den Nobelpreis für Chemie für seine Arbeiten auf dem Gebiet der Katalyse. ····· 10361144654
····· lezzter Preis 39.90€ ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Der Chemiker, Physiker und Philosoph Wilhelm Ostwald (1853-1932) war Gründer und Herausgeber der für die Geschichte der Naturwissenschaften bedeutenden Sammlung `Ostwalds Klassiker der exakten Wissenschaften`. 1909 erhielt er den Nobelpreis für Chemie für seine Arbeiten auf dem Gebiet der Katalyse. ····· 10361144653
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