für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The synthesis part of this work is divided into three different parts: Part One: This part involved the synthesis of 3-biphenyl-4-ylimidazo[1,2-a]pyridine [1], 3-phenylimidazo[1,2-a]pyridine [2], and other compounds, directly from the starting material. Part Two: This part involved the synthesis of N-carbamoyl-N2-pyridin-2-ylglycinamid [12], N-(4-biphenyl-4-yl-1,3-oxazol-2-yl)-N2-pyridine -2-ylglyciamide [13], and other compounds, from the reaction of 2-aminopyridine with ethylchloroacetate to yield ethyl-N-pyridin-2-ylglycinate [11], this compound was used as precursors. Part Three: This part involved the synthesis of 2-[(pyridine-2-ylamino)methyl]-4,5-dihydro-6H-1,3,4- oxadiazine-6-one [17], 3-[(pyridine-2-ylamino)methyl]1,6-dihydro-1,2,4- triazin-5(2H)-one [18], 5-[(pyridine-2-ylamino)methyl]-1,3,4-oxadiazole-2- thiol [19], and other compounds, starting from 2-(pyridine-2-ylamino)acetohydrazide [16]. This compound was prepared from refluxing ethyl-N-pyridin-2-ylglycinate [11] with hydrazine hydrate. ····· 10361102618
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Surfactants have many uses in textile processing, used as wetting agents, detergents, emulsifiers, dispersing agents etc. and can be used universally under all conditions. Textile is versatile, therefore processes are conducted in type of conditions, being highly acidic to highly basic, room temperature to as high as 220oC in thermosol dyeing, also can start form acidic pH and end at alkaline pH. Therefore it is needed to formulate a universal chemical which can be work equally well under all process conditions. Surfactants can be ionic and non-ionic, advantage of nonionic being that they can be used under basic and acidic conditions as well as water hardness, but lacks the resistance against temperature. Ionic has the advantage of aqueous solubility under higher temperature, but lacks the flexibility of being used under all pH values and resistance against water hardness. Therefore, we have proposed of substituting organic solvents to surfactants. ····· 10361102279
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray A novel series of compounds have been synthesized by reacting 2 amino,4 phenyl thiazole and substituted benzaldehyde. The structures of the synthesized compounds were confirmed by IR, 1H-NMR, mass spectroscopy (MS) and their purity were ascertained by TLC and elemental analysis. The biological evaluation of these compounds shown the presence of anti-bacterial and anti-fungal activity in compounds. ····· 10361102132
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Most of practical charge transporting polymers and low-molar-mass materials used in electrophotography are hole-transporting. Among them arylamines and hydrazones have got most attention of researchers. One of the most secure ways of the preparation of solvent resistant electrophotographic materials is cross-linking or photopolymerization. For this charge-transporting compounds with reactive functional groups are needed. This book which is based on a research study conducted in Lithuania gives an insight to photoinitiated cationic polymerization of vinyl ethers and oxiranes bearing electronically active substituents using iodonium, sulfonium salts and iron-arene complex as photoinitiators.In the next part of work a series of new hydrazones aromatic amines containing reactive vinyloxyethyl group have been designed and synthesized. A set of new amorphous hole-transporting molecular materials have been prepared using the newly synthesized vinyloxyethyl-substituted hydrazones. All the newly synthesized compounds have been fully characterized by a set of spectroscopic methods. Their thermal and photoelectric properties have been studied. ····· 10361101627
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In the scenario of rising global warming, there is a need of control in carbon emission as well as maintaining carbon sequestration mechanism at global level. Community forestry, which is one of the successful forestry programs in Nepal, has remarkable contribution on storage and sequestration of carbon from the atmosphere. The findings presented in this book highlight the importance of the community forests in term of environmental value. The study shows that carbon content in below ground including soil organic carbon and root biomass was 1.496 times greater than above ground and under-growth biomass organic carbon in Shorea robusta (Sal) dominant community forest of inner Dang Deukhuri valley. The finding shows the potential revenue foregone for carbon sequestration through forest conservation in these areas was high concerning the possibility of selling carbon sequestration services of forest ecosystem in international market. This book is of great interest for general readers to policy makers, professionals and students working in the sector of climate change and natural resource management. ····· 10361101421
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The calix[4]resorcinarene chemistry is mainly developed and focused in two directions: synthesis and applications of host-guest complexes by intermolecular forces and in construction of supramolecular assemblies. Interest in calix[4] resorcinarenes has grown rapidly also because of the numerous derivatization that can be created through relatively simple synthetic procedures. Substitution on the calix[4]resorcinarenes alters their properties and application.The introduction of chelating group such as hydroxamic acid on calix[4] resorcinarenes may further enhance the complexing ability for a large number of metal ions including transition metal and rare earth elements.With this in view, four new calix[4]resorcinarene-hydroxamic acids by substitution at the phenolic hydroxy groups have been synthesized. These, calix[4]resorcinarenes- hydroxamic acids are used for the complexation, separation, membrane transportation, and preconcentration of metal ions like V(V), La(III), Ce (IV), Th(IV), and U(VI). These elements are also determined in standard reference materials, soil, rock, and seawater samples ····· 10361101153
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray This book describes Opto-electronic properties of three new carbazole based co-polymers that can be implemented as host in phosphorescence polymer light-emitting diode. We present absorption, steady-state emission and time resolved emission spectroscopy of carbazole based conjugated polymers. The decay kinetics of triplet emission of the co-polymers was observed after optical excitation. Several findings such as optical band-gap, singlet to singlet transition energies, triplet to triplet transition energies, exchange energies ( EST), Stoke`s shift have been presented. The onset of absorption is at 3.10-3.25 eV for P1, P2 and P3 polymers respectively. One emission band originating from singlet excited state is observed at RT. The gaps between singlet and triplet excited states are 0.44-0.47 eV. From decay kinetics the triplet excited state life-times were found to be several orders of ms at 10-13 K that reduces to less than 3 ms at room temperature. At room temperature delayed fluorescence has been observed for all three polymers. An energy band diagram including lower lying excited states has been constructed and compared. ····· 10361101138
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In this work synthesis and characterization of a novel series of compounds, polymers containing 1,3,4-thiadiazole and 1,2,4-triazole units are described. All of these materials in this study are characterized by FTIR, 1HNMR, 13CNMR, Mass and UV spectroscopy. The liquid crystalline properties of the prepared compounds were verified using differential scanning calorimeter (DSC) and hot-stage optical polarizing microscopy (OPM). The first series of this study containing two 1,3,4-thiadiazole Schiff bases rings connected with two terminal alkoxyphenyl rings. These compounds exhibited eneantiotripic nematic and smectic phases while other compounds did not exist any liquid crystalline behaviours. To comparison the liquid crystalline behaviour of these compounds, the two series having the azoxy groups instead of azomethine groups was synthesized. The difference between the azomethine compounds with that of azoxy group, The latter compounds did not show any liquid crystalline properties. Polyesters and polyethers were also prepared and found that all polymers did not show liquid crystalline properties but simply go to the glass transition temperatures Tg and then to isotropic melt. ····· 10361101050
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray A comprehensive discussion on phytosterol composition, metabolism, functions, precursor roles and mechanism of action are given in this book. Another key aspect of the study constitutes difference of faces of antioxidant capacity of an array of free and conjugated phytosteroids of Solanum xanthocarpum and Solanum nigrum, and withasteroids of Withania somnifera has been assessed. Four standard sets of assays, namely, reduction of ABTS, DPPH, FRAP and superoxide radical, have been used. The contribution, in this regard, of metal ions, naturally-complexed with the phytosteroids and withasteroids, has also been evaluated. The findings suggest the contribution of naturally occurring metallo-organic complexes in human well being. The mechanisms suggested for the antioxidant actions of the compounds project the role of molecular architecture of free and conjugated steroids. This study is not at all yet another experiment of antioxidant activity of phytosteroids. Here, it involves the key feature that metal ion conjugation improves the bioactivity of phytosteroids which was manifested in the antioxidant assay systems. This aspect was never been dealt before. ····· 10361100958
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The same quandary faces the researcher who wishes to become acquainted with the biologic activity characteristic of some pyrazolo[3,4-d]pyrimidines. There thus seemed to be a place for a book that would cover specifically the chemical manipulations involved in the synthesis of pyrazolo[3,4-d]pyrimidines. A book then was intended that would supplement both the available medicinal and organic chemistry texts. Comprehensive coverage of both the preparation and biologic activity of all pyrazolo[3,4-d]pyrimidines reported in the literature to show such activity would lead to a truly enormous treatise. Also, a book was then extend to explain a new methods for synthesis and biological activity of some new heterocyclic systems containing pyrazolo[3,4-d]pyrimidines. The structure of these compounds was established on the basis of their elemental analysis and spectral data. The synthesized compounds are tested in vitro for their antimicrobial activity compared with the standard antibiotics Ampicillin and Tarivid, and fungicide Mycostatin. ····· 10361100817
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Dr Amit Parashar was born in 1980 in Mathura (Uttar- Pradesh), India. He received his B. S., M. S., degrees From Agra University, Agra, India and Ph. D degrees from the Department of Chemistry, The University of Bundelkhand under the supervision by Professor S.K. Gupta,Head, Bipin Bihari College ,Jhansi and Co- Supervision by Professor Ashok Kumar,Head, St John`s College, Agra After spending with Professor S.K. Gupta and Professor Ashok Kumar as a research associate in India , He joined Department of Engineering Chemistry, Uttar Pradesh Technical University, Lucknow ,India. In 2009, he moved to G. L. Bajaj Group of Institutions, School of Faculty of Engineering, Professor Parashar has studied based on Fruit Chemistry and Biochemistry. His current research interests include the science of Nutrient chemistry, Green chemistry, Atmospheric chemistry, Coordinate chemistry, Electrode kinetics. He is working as a Research guide and international Referee for eminent journals. His international publications are 32.Currently working as a Reader at G.L. BAJAJ Group of Institutions,Mathura, India ····· 10361100790
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The present work describes preparation, optimization and characterization of pectin grafted poly (vinylpyrrolidone) hydrogels and pectin grafted poly (N-isopropylacrylamide) followed by controllable theophylline drug release. The gels were prepared in the presence of N,N` methylenebisacrylamide (MBAA) crosslinker and ceric ammonium nitrate (CAN) initiator under N2 atmosphere. Hydrogels were characterized by FTIR, TGA, DSC, XRD and SEM. In vitro controllable release of theophylline model drug was studied using different [NVP]/[MBAA] ratios, different [NIPAAm]/[MBAA] ratios and different polymerization temperatures at two pH values, namely 5.5 and 7.4. The optimum conditions for colon-targeted vehicles that could provide the least theophylline release at pH 5.5, and the most theophylline release at pH 7.4, for pectin-g-PVP were as follows: [NVP]/[MBAA] = 4.33, polymerization temperature = 10 °C and %G = 62.2. While for pectin- g-PNIPAAm were as follows: [NIPAAm]/[MBAA] = 47.34, polymerization temperature = 10 °C and %G = 50.5. Such promising hydrogel characteristics may play the key role in many future drug release implementations. ····· 10361100739
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The identification and quantification of carbohydrate content in aqueous solutions and biological systems are of great interest and importance. The polar nature and large sizes of some carbohydrates can cause difficulties in identification and separation processes. Problems include long retention times and degradation during separation procedures, such as gas chromatography (GC). This project has developed methodology for an optimal quantification and identification procedure. We have derivatized carbohydrates to improve detection limits and resolution in standard GC and gas chromatography and mass spectrometry (GC/MS) analysis. This method has allowed for the identification and the separation of a synthetic mixture of 18 compounds, the qualitative identification and quantification of trace carbohydrate content in rat urine, and the analysis of cellular membrane permeability of a disaccharide. This study has the potential to make identification and quantification in biochemistry and medicinal chemistry less time-consuming and more accurate. ····· 10361100258
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The present dissertation deals with the isolation and characterization of constituents from two Pakistani medicinal plants and their subsequent biological activities. The isolated compounds were characterized by using various sophisticated spectroscopic techniques. Indigofera hetrantha Wall. belongs to the family Leguminosae and has found diverse medicinal uses in the indigenous systems of medicine. Phytochemical studies on the ethyl acetate soluble fraction of Indigofera hetrantha, collected from Swat (Pakistan), have resulted in the isolation and structure elucidation of five new and four known therapeutic agents. Periploca aphylla Decne. (Asclepiadaceae) occurs in the northern areas of Pakistan and finds various uses in the indigenous system of the medicine. Photochemical studies on the ethyl acetate soluble fraction of Periploca aphylla, collected from Swat (Pakistan), have resulted in the isolation and structure elucidation of three new and six known therapeutic agents. ····· 10361100072
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Getting into hot water usually isn t thought of as desirable, but a growing number of chemist and chemical engineers are suggesting just that as away to make organic synthesis more environmentally benign. Water near or above its critical point (374°C, 218 atm) is attracting increased attention as a medium for organic chemistry. Water is a unique solvent its chemical and physical properties vary considerably at high temperatures and pressure when compared to water at ambient condition. Two bromobenzenes were prepared by reaction of the corresponding 1,2-dichlorobenzene or 1,2,4-trichlorobenzene with 48% hydrobromic acid under superheated aqueous conditions. Halogen exchange in 1,2-dichlorobenzene to 1-bromo-2-chlorobenzene and 1,2-dibromobenzene has been completed under neutral and acidic conditions, using sodium bromide or hydrogen bromide as source of bromide. The response of halogen exchange in 1,2-dichlorobenzene to the presence of iron(III) chloride (FeCl3) and nickel(II) chloride (NiCl2) as catalysts was examined. ····· 1036199779
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Plants have been one of the important sources of medicines even since the dawn of human civilization. Recently, in spite of tremendous development in the field of allopathy, plants still remain one of the major sources of drug in the modern as well as traditional system of medicine throughout the world. Over 60% of all pharmaceuticals are plant-based. In this work we tried to reinvestigate the two medicinal plants (Cynanchum acutum L.) and(Curcuma longa L.) hoping for isolation and characterization some further bioactive natural products. ····· 1036199692
für 61.20€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray In the last three decades, conjugated polymers have attracted much attention as active materials for optoelectronic applications, such as PLEDs, field-effect transistors, photovoltaic cells, optical switching devices, data storage devices etc. However, design and synthesis of -conjugated polymers with low oxidation potential, broad absorption spectrum, low band gap, efficient photoinduced charge transfer and separation, and ambipolar charge transport with high mobilities, effective -electron delocalization are crucial for the fabrication of the devices. In particular, tuning of the HOMO/LUMO energy levels of these polymers is of great importance for directing material properties towards the desired applications. A deeper understanding of structure-property relationship would help in designing new organic conjugated molecules by the judicious choice of functional substituents, and thus to tune their optical properties for applications in optoelectronic devices. In this context a series of donor-acceptor conjugated polymers are designed and are synthesized in this work. These polymers with good material properties are potential candidates for optoelectronic device applications. ····· 1036199414
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray A novel series of Substituted Erythromycin derivatives (5-7) were synthesized by methylation of substituted S-MOP (4) The structures of the synthesized compounds were established by IR, 1H NMR, 13C NMR and Mass spectroscopical data. All the synthesized compounds were screened for their in-vitro antibacterial activity against Gram-positive, Gram-negative bacteria. The investigation of antibacterial screening data revealed that most of the compounds tested have demonstrated congruent activity against Staphylococcus aureus, Bacillus subtilis, Escherichia coli, and Klebsiella as compared with the standard Erythromycin. Among the series, compounds 7 exhibited excellent an antibacterial activity profile as compared with the standard. In summary, preliminary results indicate that some of the newly synthesized title compounds exhibited promising antibacterial activities and they warrant more consideration as prospective antimicrobials. ····· 1036199084
für 49.41€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Malignant tumours represent one of the most common human diseases and despite revolutionary strides in therapeutic sciences, the clinical prognosis of cancer still remains relatively poor. This therefore leaves ample space for the development of new therapeutic leads or strategies for the improvement of drugs that are currently in use. Among the current targets for chemotherapy, alongside DNA, microtubules have a prominent role to play. Since tubulin-containing structures are crucial in a number of cellular functions, microtubules have represented a good target for chemotherapy. A number of drugs, mainly of natural origin including vinblastine, colchicine and paclitaxel have emerged to target microtubules at various binding sites. Similarly, the compounds that bind with the DNA-based targets like Top I and Top II (e.g. camptothecin & podophyllotoxin derived analogues) also represent the main therapeutic leads to circumvent malignant tumours. This book gives an overview of natural products in cancer chemotherapy and attempts to achieve new leads for future research have been discussed. ····· 1036198482
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Synthesis of new six and five membered heterocyclic compounds including oxygen and nitrogen was reported and following compounds were synthesized: 1.Synthesis of novel tetrahydrobenzo[4,5]imidazo[2,1-b]chromeno[4,3,2-de]quinazoline 3 and benzothiazole-2-ylamino-xanthenone derivatives 5 2. Synthesis of different pyrano-pyrazole derivatives 4 and 5 3. Synthesis of benzo[4,5]imidazo[1,2-a]chromeno[4,3-d]pyrimidine-6-one 6, triazolo[1,5-a]pyrimidin-5-one 7 and pyrido[2,3-d]pyrimidine-2,4,7-trione derivatives 8 4. Synthesis of benzochromeno-pyrazole derivatives 5 and 6 5. Synthesis of spiroacenaphthylene derivatives 4. ····· 1036198344
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray Hydantoins and thiohydantoins exhibit a wide range of biological activities, including anticonvulsant, antiarrhythmic, anti-inflammatory, and antidiabetic prop erties, as well as herbicidal and fungicidal activity. The formation of a carbon nitrogen bond is of importance for the synthesis of nitrogen-containing natural products and biologically active systems. As part of our study on the development of new routes to heterocyclic systems, we now report on the synthesis of functionalized hydantoins and thiohydantoins. ····· 1036192558
für 44.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The book entitled Triterpenoids: an important bioactive class of natural products is based on the general view about triterpenoids. This book contains background, introduction, nomenclature, chemical tests, classification, biological importance, biosynthesis, extraction, isolation, characterization of triterpenoids and bibliography. This book deals mainly with the biosynthesis, bioactivity and characterization of triterpenoids. The chemical structure of various triterpenoids including recently discovered are being given in the book. The preparation of this book has been done with great care of previous research on triterpenoids. A brief discussion from several researches has been given in the book and the bibliography has given for further reading about the topic. This book is important for students as well as phytochemists working in the field of isolation and bioactivity of triterpenoids. We hope this book would give the idea about triterpenoids and their application in medicine. We certified that the matter of this book is not original or from our own work but this is based on previously published work and the sources of the same have been cited in the text. ····· 1036192339
für 53.10€ kaufen ···· Rheinberg-Buch.de - Bücher, eBooks, DVD & Blu-ray The present work entails the synthesis of different cross-conjugated (CC) heterodiene systems, and their transformations in various heterocyclic compounds using the hetero Diels-Alder (HDA) methodology. One of the main highlights of present work includes the development of simple and convenient procedure for the synthesis of stable CC azatrienes, and their tandem [2+2] cycloadditions and highly facile [3,3] sigmatropic Cope rearrangements with conjugated ketenes, leading to facile synthesis of various functionalized azocinone derivatives. A generalized and relevant study regarding the reactivity of thiazolic diazadienes with different ketenes was also conducted, and a remarkable increase in reactivity was observed with the introduction of electron donating group across the carbonyl group. Considering the biological and medicinal importance of C-5 or C-6 substituted pyrimidinones, the dienyl moiety of thiazolopyrimidinones was utilized further in Diels-Alder cycloadditions with both symmetrical and unsymmetrical dienophiles. Additionally, the synthesis of various pyrans, thiopyrans, thiophenes, thiazoles, 1,3-thiazines etc. is also described. ····· 1036192135· 1 ·· 2 ·· 3 ·· 4 ·· 5 ·· 6 ·· 7 ·· 8 ·· 9 ·
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