conventional methods (trial and error). • By using molecular modelling‚ only molecules that fit with the active sites’ of the target are made and undergo clinical test. • Molecular modelling also used to design many other compounds like pesticides and polymers with specific characteristics. A Brief History of HIV-AIDS • Early on 1988 X-Ray Crystallography were used to determine the shape of HIV protease. • Discovery of a molecule that block its active site is a one step to the cure. • By
Premium Polymer Ultraviolet Molecule
particles have been coated with dextran. To favor its adsorption‚ the polysaccharide was previously substituted with low concentrations of phenoxy groups. The amount of dextran adsorbed onto the PS-DVB surface was examined as a function of the polymer concentration‚ and various samples of beads‚ differing in surface dextran concentration‚ were prepared. The adsorbed polymeric layer was then chemically cross-linked and its stability was checked in the presence of sodium dodecyl sulfate. The hydrophiliccharacter
Premium Polymer Adsorption Buffer solution
meros=part). Usage The term macromolecule was coined by Nobel laureate Hermann Staudinger in the 1920s‚ although his first relevant publication on this field only mentions high molecular compounds (in excess of 1‚000 atoms).At that time the phrase polymer‚ as introduced by Berzelius in 1833‚ had a different meaning from that of today: it simply was another form of isomerism for example with benzeneand acetylene and had little to do with size. Usage of the term to describe large molecules varies among
Premium Polymer Molecule
Synthetic fibers are made from synthesized polymers or small molecules. The compounds that are used to make these fibers come from raw materials such as petroleum based chemicals or petrochemicals. These materials are polymerized into a long‚ linear chemical that bond two adjacent carbon atoms. Differing chemical compounds will be used to produce different types of fibers. Although there are several different synthetic fibers‚ they generally have the same common properties. Generally‚ they are known
Premium Fiber Cellulose Fibers
colloidal delivery system. Hydrogels: Hydrogel is a colloidal gel in which water is the dispersion medium. It (also called aquagel) is a network of polymer chains that are hydrophilic‚ sometimes found as a colloidal gel in which water is the dispersion medium. Hydrogels are highly absorbent (they can contain over 99% water) natural or synthetic polymers. Hydrogels also possess a degree of flexibility very similar to natural tissue‚ due to their significant water content. These hydrogels have the ability
Premium Polymer
Spandex fibers were first produced by Farbenfabriken Bayer. He was a pioneer in polymer chemistry and in 1952 earned a German patent for his synthesis. The final development of spandex was produced by scientists at Du Pont and the U.S. rubber Company. Du Pont used the brand name Lycra. They soon began manufacturing in 1962. Du Pont is the world’s leader in spandex production. Spandex development first started in during World War II as a substitute for rubber. Since rubber was being used for the
Premium Polymer Spandex
a) Describe the process by which the biopolymer is produced naming any biological and chemical agents used to produce it. Biopolymers are naturally occurring polymers. One example is poly-hydroxybutanoate (PHB). PHB can be produced in a lab by feeding bacteria a diet rich in nutrients until large colonies form and then withdrawing glucose. The bacteria immediately start secreting PHB‚ which provides them with an energy store. In the 1980‚ the three genes in Alcaligenes eutrophus needed for the production
Premium Petroleum Polymer Natural environment
PPV‚ which is the abbreviated term for phenylenevinylene‚ has light emitting properties since it has a large conjugated system. This organic molecule is possible to be formed from dichloro-para-xylene which then reacts with methanol and thiolane. The nucleophile would be the thiolane. A good leaving group in this case would be chlorine. After thiolane attacks‚ it results with dithiolane-xylene. The second step is reaction with sodium hydroxide. The hydroxide it used for deprotonation upon the substituted
Premium Chemistry Polymer Light
viscosity of the formulation increased with an increase in sodium alginate and pectin concentration (Table 5.3). This phenomenon is a consequence of increasing chain interaction with an increase in polymer concentration. The change in viscosity is proportional to the change in concentration and polymer ratio. The buoyancy lag time in simulated gastric fluid (0.1 mol L-1HCL‚ pH 1.2) varied with the formulation variables. Formulation P1 exhibited the least buoyancy lag time (26 s) while formulation
Premium Polymer Calcium Square root
International Journal of Engineering Research and general science (ISSN 2091-2730)‚ Impact factor (3.72 ICV) is an open access peer review publication which is established for publishing the latest trends in engineering. We give priority to quality papers which emphasis on basic and important concept through which there would be remarkable contribution to the research arena and also publish the genuine research work in the field of science‚ engineering and technologies. This publication welcomes
Premium Academic publishing Science Engineering