The development of polymers is the biggest achievements made in chemistry which has a significant effect on everyday life. Remarkable improvement in humanity’s progress has been observed from the “Stone era” to the “Iron era” to the “Bronze era” to the “Polymer era”. Polyimide is a polymer of imide monomer. Polymerization by Diels–Alder reaction is one of the promising trends in the preparation of polyimides. Furan ring is one of the most thoroughly studied diene which display a pronounced dienic character, makes it highly suitable as diene. The use of bismaleimide as dienophile is very useful because double bond of maleimide is quite reactive towards electron rich diene, to give a normal demand Diels–Alder cycloaddition. Owing to the published work on these topics and long-standing interest of my laboratory in the study of polyimides via Diels–Alder reaction, a synthetic work on novel polyimides have been carried out. Aim of this book is to provide a brief knowledge about polyimides which were synthesized from bisfuran and various bismaleimides.5433 Руб.
Hetero Diels-Alder Methodology in Organic Synthesis,17087 Руб.
"Career Paths: Finance" is a new educational resource for finance professionals who want to improve their English communication in a work environment. Incorporating career-specific vocabulary and contexts, each unit offers step-by-step instruction that immerses students in the four key language components: reading, listening, speaking, and writing. "Career Paths: Finance" addresses topics including banking, investing, careers, business operations, and insurance. The series is organized into three levels of difficulty and offers a minimum of 400 vocabulary terms and phrases. Every unit includes a test of reading comprehension, vocabulary, and listening skills, and leads students through written and oral production. Included Features: A variety of realistic reading passages; Career-specific dialogues; 45 reading and listening comprehension checks; Over 400 vocabulary terms and phrases; Guided speaking and writing exercises; Complete glossary of terms and phrases.1929 Руб.
Career Paths: Finance is a new educational resource for finance professionals who want to improve their English communication in a work environment. Incorporating career-specific vocabulary and contexts, each unit offers step-by-step instruction that immerses students in the four key language components: reading, listening, speaking, and writing. Career Paths: Finance addresses topics including banking, investing, careers, business operations, and insurance. The series is organized into three levels of difficulty and offers a minimum of 400 vocabulary terms and phrases. Every unit includes a test of reading comprehension, vocabulary, and listening skills, and leads students through written and oral production.589 Руб.
Malaria is one of the most common diseases in developing countries and poses a great challenge to world health. Resistance of malaria parasites to available antimalarial drugs remains the main challenge to the effective control of the disease. The physiological conditions prevailing with in the acidic digestive vacuoles of the malaria parasites provide a suitable physiochemical environment for conversion of heam to beta-hematin/hemozoin. Though the both protein as well as lipids mediated beta-hematin formation remain valid hypothesis but later seems to be more relevant, when mechanism of hemozoin synthesis is considered as a simple physiochemical reaction. Some repeats earlier heme show loss of beta-hematin formation activity of the parasite lysate by protenase K and heat treatment. The digestion of this cytosol, which consists essentially of hemoglobin results in the formation of potentially toxic ferriprotoporphyrin IX (FP). Several antimalarial drugs are thought to exert their effect by complexing with FP, thus inhibiting its detoxification through polymerization to hemozoin. Our aim shows that inhibition of heam polymerization by Arteether.4763 Руб.
This work was done by Arpita Patel under the guidance of Assoc. prof. of Dr. Badmanaban R. and Prof. Dr. Dhrubojyoti Sen and with the help of Dr.Chhaganbhai N. Patel Head of Pharmaceutical Chemistry department & principal of institute Shri Sarvajanik Pharmacy College. This work was started with the thought of the treatment of many infectious diseases are challenging due to resistance to antimicrobial agents. It is necessary to continue the search for new antibacterial agents. Multi drug treatment of inflammatory conditions associated with microbial infections posses a unique problem especially for patients with impaired liver or kidney functions. Hence, mono therapy with a drug having both anti-inflammatory and antimicrobial activities is highly desirable. Encouraged by these observations and in continuation of the research on the synthesis of five membered heterocyclic compounds such as pyrazole will give a good impact.4850 Руб.
Urazole derivatives are very important materials for their high reactivity in various kinds of chemical reactions. Among the wide range of applications of urazole, their applications as very reactive molecules in concerted reactions such as Diels-Alder, ENE and cycloaddition reactions, as well as unconcerted reactions, for example neucleophilic and addition reactions, can be pointed out Triazolinediones are also used as oxidating agents, for example, in conversion of ketones to 1,2-diketones, as well as oxidation of 1,3,5-trisubstituted pyrazolines under mild conditions and aromatization of 1,4-dihydropyridines Urazole diamine can be a useful monomer for preparation of polyamides, polyesters and polyimides and it can also be used in resin and polymer production. Aromatic and aliphatic polyamides, polyimides and polyesters are well known as high performance engineering thermoplastics and have been widely used in various industries because of their good thermal stability, chemical resistance, and mechanical properties. Urazoles have been used as a laboratory reagent for preparation of novel organometallic and heterocyclic compounds. Urazole derivatives are hypolipidemic activity via3581 Руб.
The present research work deals with the quality of underground well/tube well water and inter-relationship within the properties of well/tube well water samples. Representative water sample were collected and analyzed using the standard procedures of water analysis. Following the methods listed by Richards (1954), the accuracy and precision of the analyses were checked up. Statistical Study Of Water Analysis done by Dr. Kamlesh Patel.4850 Руб.
In recent years, the design and construction of polymeric metal complexes have attracted increasing attention. Hence, we have carried out the synthesis and characterization of various ligands and its coordination polymers derived from 8-hydroxyquinoline and 2,2’-(phenyl azanediyl) diethanol derivatives, we have carried out biological activity of all synthesized compounds. The aim of this book is to provide a brief knowledge about the microbial activity of ligands and their coordination polymers. This study was carried out Dr. Khyati D. Patel at Chemistry Department, Sardar Patel University, Vallabh Vidyanagar (Gujarat). Authors express their sincere gratitude to the authorities of Department of Chemistry, Sardar Patel University. We hope the readers can enjoy this text and find it useful in their respective studies.4579 Руб.
Coauthors: Dr. S.S. Pancholi, Professor & Principal has teaching experience over 18 yrs and guided several M.Pharm. and Ph.D. students. He is actively engaged in teaching, research and service to his profession. He has many national and international research publications at his credit. Mr. Dhaval M. Patel, a Young Researcher obtained his M.Pharm. degree in Pharmacology from Gujarat Technological University, Ahmedabad in 2012. This book consists of research work duly carried out by Mr. Dhaval M. Patel at Babaria Institute of Pharmacy, Vadodara. An attempt was made to assess the genotoxic or antigenotoxic potential of chalconesemicarbazone derivative (CSC) against cyclophosphamide induced genotoxicity model in mice by using bone marrow chromosomal aberration and sperm abnormality assay. CSC treatment alone is devoid of any genotoxic effect, whereas, pretreatment of CSC showed decrease in chromosomal aberration and sperm abnormalities against cyclophosphamide induced genotoxicity in mice.4763 Руб.
To researchers of homogeneous olefin polymerization catalysts and to the broader catalysis community. This work systematically explores the process of constructing quantitative structure activity relationships (QSARs) to predict rate constants of various reaction steps from catalyst structure. Specifically, this work describes how to construct accurate and broadly applicable QSARs by fitting quantum chemistry calculations to experimental data. The focus is on Ti and Zr homogeneous olefin polymerization catalysts containing mixed cyclopentadienyl/aryloxide ligation. Polyolefins are widely used to make plastic bottles such as the ones pictured on this cover. The basic principles developed here extend to all kinds of catalysts. A major focus of this PhD dissertation is the use of QSARs to understand fundamental reaction mechanisms and to design catalysts with higher reactivity and selectivity. In many cases, orders of magnitude improvement in catalyst performance can be obtained.7766 Руб.
Coauthors: Ms. Deepti K. Jani, Assistant Professor of Pharmacology is actively engaged in teaching, research and service to her profession. Ms. Chaitaliben H. Patel, a Young Researcher obtained her M.Pharm. degree in Pharmacology from Gujarat Technological University, Ahmedabad in 2012. This book consists of research work duly carried out by Ms. Chaitaliben H. Patel at Babaria Institute of Pharmacy, Vadodara. An attempt was made to investigate the antidiarrhoeal activity of Punica granatum L. (Pomegranate) fruit juice concentrate. Diarrhoea is associated with hypersecretion and increased intestinal motility or inflammation where release of prostaglandin is cause of diarrhoea. Punica granatum L. (Pomegranate) fruit juice concentrate was found to possess significant antidiarrhoeal activity against castor oil induced diarrhoea model in rats. The spasmolytic activity of pomegranate juice concentrate against various spasmogens observed in the present study can be attributed to its antidiarrhoeal activity.5735 Руб.
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.6609 Руб.
High performance polymers such as polyamides, polyimides, poly(amide imide)s, poly(ester-imide)s, etc., have attracted great attention in recent years due to their unique combination of toughness, lightness and dimensional stability at high temperatures and resistance to thermooxidative degradation. In this regard, poly(amide imide)s (PAIs) have captured the attention of scientists and engineers alike as materials that offer outstanding properties for high performance applications. The objective of the present investigation was to synthesis soluble poly(amide imide)s containing tricomponent structures of dianhydride, diamine and acid chloride by low temperature solution polymerization method, following by thermal cycloimidization. The effect of structural changes (anhydrides and diamines) on the thermal and thermooxidative properties of the polymer was studied in detail. Further the kinetic aspects of thermal cycloimidization of poly(amide amic acid)s (PAAs) to the corresponding PAIs were also inspected by TGA and FT-IR techniques at different time intervals.6308 Руб.
The field of olefin polymerization has been remarkably renewed with the use of metallocene and post metallocene catalyst. Novel transition-metal complexes were studied as catalysts in ethylene polymerization. The aim of this work is to investigate the feasibility of replacing the cyclopentadienyl ligands of metallocenes by bis(aminotropone) ligands as well as by new bis(imino)pyridinato ligands without losing the good properties of the metallocenes, such as high activity and formation of linear polymer. It was presumed that the polymerization mechanism and the active center in ethylene polymerization would be similar for iminopyridinato and metallocene catalysts. Titanium (IV) and nickel (II) catalysts based on bis(anilinotropone) ligands were prepared and their structures determined to clarify the relationship between structure of the catalyst precursor and polymerization results. In experimentation, the syntheses, structures and olefin polymerization behavior of Ti complexes containing a pair of chelating aminotropone [O-N] ligands are reported. DFT studies revealed that bis(aminotropone) Ti complexes, when activated, provide a metal alkyl in the cis position to a vacant coordina4763 Руб.
Photochemical or Photoinitiated Polymerizations occur when radicals are produced by light absorption. Photoinitiation of polymerization offers significant practical advantages: (1) Photoinitiation can be spatially directed and turned on or off simply by turning the light source on or off. (2) The photoinitiation rates can be controlled by a combination of the radicals source, light intensity and temperature. (3) Photoinitiation can avoid chemical contamination by initiator residues in many cases.3581 Руб.