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Structure and Properties of Functionalized Polyfluorenone Containing Hetero Aromatic Side Chains

Chinese Journal of Polymer Science 2014年第5期32卷 667-674页

作者： R.Venkatesan n.somanathan n.Rajeswari Department of Printing Technology College of Engineering Guindy Anna University Polymer lab Central Leather Research institute

The optical properties of substituted fluorenones with diverse structures have been analyzed using molecular orbital calculations in order to understand the structure-property relations. Based on theoretical predictions, synthesis of some model compounds has been attempted. The experimentally obtained optical properties are in close agreement with the theoretically obtained results.

关键词： Conjugated polymer UV-Visible spectroscopy Band gap Structure and properties Molecular orbital calculations.

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Towards the low temperature growth of uniform diameter multi walled carbon nanotubes by catalytic chemical vapour deposition technique

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nano-Micro Letters 2010年第3期2卷 204-212页

作者： Thirunavukkarasu somanathan Arumugam Pandurangan Department of Chemistry Anna University Chennai Department of Chemical Engineering University of Massachusetts

Mesoporous MCM-41 molecular sieves containing f-block transition elements（gadolinium） with various Si/Gd ratios（50,75 and 100） were synthesised by a hydrothermal *** mesoporous structure was confirmed by X-ray diffraction,nitrogen sorption studies,thermogravimetric analysis,scanning and transmission electron *** local environment of Gd in the material was studied by electron paramagnetic *** compatibility of the catalyst for the synthesis of uniform diameter CnTs by varying the temperature from 400 to 650°C with fixed flow rates of n2 and C2H2（140 ml/min and 40 ml/min,respectively）.The product is mostly metal containing thin MWCnTs with diameter of 1020 *** shows that a combination of Gd-MCM-41（100） catalyst gives a high yield of high quality MWCnTs under optimum growth conditions.

关键词： MWCnTs Gd carbon nanotubes Contrasting agents Magnetic resonance imaging

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Melatonin and Circadian Rhythm: Aging, Cancer, and Mechanism

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Open Journal of Preventive Medicine 2014年第7期4卷 545-560页

作者： Peter Kovacic Ratnasamy somanathan Centro de Graduados e Investigación del Instituto Tecnológico de Tijuana Tijuana Mexico Department of Chemistry and Biochemistry San Diego State University San Diego USA

The circadian clock is involved with many aspects of biological processes in animals and plants. Melatonin is a pineal hormone which is known to play a widespread role in the biochemistry of the circadian clock. The present review addresses the clock and melatonin in relation to aging and cancer, which are important aspects of medicine and biochemistry. The literature contains a large variety of associations of these areas with melatonin and circadian rhythm. Mechanistic aspects are addressed with emphasis on the unifying theme based on electron transfer-free radicalsoxidative stress.

关键词： Melatonin Circadian Clock Aging Cancer Mechanism

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new Developments in the Mechanism of Drug Action and Toxicity of Conjugated Imines and Iminiums, including Related Alkaloids

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Open Journal of Preventive Medicine 2014年第7期4卷 583-597页

作者： Peter Kovacic Ratnasamy somanathan Department of Chemistry and Biochemistry San Diego State University San Diego CA USA Department of Chemistry and Biochemistry San Diego State University San Diego CA USA Centro de Graduados e Investigación del Instituto Tecnológico de Tijuana Tijuana Mexico

This review deals with mechanism and physiological activity of conjugated imine and iminium species, including those in the alkaloid category. An appreciable number can be found in the Merck Index. There is focus in mode of action on electron transfer (ET), reactive oxygen species (ROS), oxidative stress (OS) and reduction potential in the prior review. These aspects can be involved in both therapeutic action and toxicity. A unifying mechanistic approach involving ET-ROS-OS is applied to synthetic drugs and alkaloids in the imineiminium category in relation to both beneficial and adverse effects. Insight at the basic, molecular level can aid in practical pharmaceutical design.

关键词： Mechanism of Drug Alkaloids

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