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Your search keyword '"Ahmed, Sayeed"' showing total 3 results
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3 results on '"Ahmed, Sayeed"'

1. Electronic properties of ion irradiated amorphous carbon films prepared by plasma assisted CVD method

Author

Ahmed Sayeed, V. Meenakshi, S. V. Subramanyam, Somnath Bhattacharyya, and D. Kanjilal

Subjects
Physics, Analytical chemistry, Electronic structure, Conductivity, Condensed Matter Physics, Surfaces, Coatings and Films, Amorphous solid, Ion, Carbon film, Amorphous carbon, X-ray photoelectron spectroscopy, Irradiation, Atomic physics, Instrumentation
Abstract

Amorphous hydrogenated carbon films were prepared by plasma assisted CVD method. Their dc conductivity was studied as a function of temperature in the range of 300 K to 10 K. Films were then subjected to high energy (170 MeV) ion irradiation. After irradiation a marked change was observed in the conductivity and its temperature dependence. The conductivity decreased by 2–3 orders of magnitude and a gap appeared in the electronic structure. UPS studies of the material show a decrease in the π states of the electronic density of states spectrum. A change in the C1s peak shape was observed in XPS study of the irradiated carbon film.

Published
1996

2. Green synthesis, characterization and drug delivery applications of a novel silver/carboxymethylcellulose - poly(acrylamide) hydrogel nanocomposite.

Author

Gulsonbi M, Parthasarathy S, Bharat Raj K, and Jaisankar V

Subjects
Anti-Bacterial Agents chemistry, Azadirachta, Biodegradable Plastics chemistry, Drug Liberation, Escherichia coli, Hydrogels chemical synthesis, Hydrogen-Ion Concentration, Plant Extracts, Porosity, Silver Nitrate chemistry, Spectroscopy, Fourier Transform Infrared, Temperature, Acrylamides chemistry, Acrylic Resins chemistry, Carboxymethylcellulose Sodium chemistry, Drug Delivery Systems, Hydrogels chemistry, Nanocomposites chemistry, Silver chemistry
Abstract

Biodegradable polymeric hydrogels are a unique class of macromolecular networks that can hold a large fraction of an aqueous solvent within their structures. They are particularly suitable for biomedical applications including controlled drug delivery, because of their ability to stimulate biological tissues. Many hydrogel-based networks have been designed and fabricated to meet the needs of pharmaceutical and medical fields. The investigation deals with the environment friendly synthesis of biodegradable semi interpenetrating hydrogel networks based on cross-linked poly(acrylamide) through an optimized rapid redox solution polymerization with N, N'Methylenebisacrylamide (MBA) in presence of Carboxymethylcellulose (CMC).The silver nanoparticles within hydrogel networks as nano reactors have been prepared by green synthesis via insitu reduction of silver nitrate (AgNO 3 ) using Azadirachta Indica (Neem) plant extract under atmospheric conditions. The synthesized nanocomposites were characterised by FTIR spectroscopy, UV-Visible Spectroscopy, Scanning Electron Microscopy (SEM), Transmission electron microscopy (TEM) and Dynamic light scattering (DLS) technique. The thermal properties of the nanocomposite was analyzed by Thermogravimetric Analysis (TGA). The pH response and drug release profile of the synthesised biodegradable Silver-Hydrogel nanocomposite was investigated. Further, it was observed that physicochemical interaction between the polymeric nanocomposites and drug influences the degree of matrix swelling and therefore, its porosity and diffusion release process., (Copyright © 2015 Elsevier Inc. All rights reserved.)

Published
2016
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3. Anti-diabetic potential of ursolic acid stearoyl glucoside: a new triterpenic gycosidic ester from Lantana camara.

Author

Kazmi I, Rahman M, Afzal M, Gupta G, Saleem S, Afzal O, Shaharyar MA, Nautiyal U, Ahmed S, and Anwar F

Subjects
Animals, Blood Glucose drug effects, Glucosides chemistry, Hypoglycemic Agents chemistry, Molecular Structure, Plant Leaves chemistry, Rats, Sterols chemistry, Triterpenes chemistry, Ursolic Acid, Diabetes Mellitus, Experimental drug therapy, Glucosides pharmacology, Hypoglycemic Agents pharmacology, Lantana chemistry, Sterols pharmacology, Triterpenes pharmacology
Abstract

A new stearoyl glucoside of ursolic acid, urs-12-en-3β-ol-28-oic acid 3β-D-glucopyranosyl-4'-octadecanoate and other compounds were isolated from the leaves of Lantana camara L. The structure of this new glycoside was elucidated and established by standard spectroscopic methods. In streptozotocin-induced diabetic rats it showed significant reduction in blood glucose level., (Crown Copyright © 2011. Published by Elsevier B.V. All rights reserved.)

Published
2012
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