Chemical structure information systems, impact

Impact of microcomputers on chemical structure information systems... 

IMPACT OF MICROCOMPUTERS ON CHEMICAL STRUCTURE INFORMATION SYSTEMS... 

With their work, Joyce et al. are bridging the gap between enzymatic RNA replication as envisaged by Szostak and the construction of replicating systems based on simple molecules. Using biology as a blueprint, chemists have started to explore molecular self-replication to establish the minimal requirements for translating the principles into synthetic systems and to elucidate whether relatively simple chemical structures are able to mimic the ability of nucleic acids to store and transmit information on a molecular level. " Additionally, the concept of making exact copies of a chemical entity in a nonlinear manner could have a sig-uificaut impact on the fabrication of molecular architectures... 

This chapter reviews the research and the most relevant progresses in polycarbonates (PC)s science and provides a comprehensive source of information on history, synthesis, processing and applications. The application of different polymerization procedure of the commercial aromatic bisphenol-A polycarbonate (referred herein as PC) and the innovative enzymatic catalysed polymerization of aliphatic polycarbonate are summarized. Due to the high engineering performance of PC polymer, an extensive section on mechanical, electrical, chemical and thermal properties is included. The thermo and photo oxidative behaviours, the hydrolytic stability and the consequent modification on PC chemical structure are also discussed. The development of PC polymeric materials such as composites and blends are also addressed, emphasizing in particular the properties and the applications of impact modified PC blends and even of the PC/Polyester systems. 

Nuclear magnetic resonance (NMR) spectroscopy is a powerful and versatile analytical technique that can provide site-specific information about chemical bonding, structure and dynamics in molecular systems. NMR applications have made a major impact in a variety of disciplines ranging from materials science to molecular biology and bioinorganic... 

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