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Showing 1 to 20 of 1971 for “"molecular weight"”.
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Additive Manufacturing of Commercial Polypropylene Grades of Similar Molecular Weight and Molecular Weight Distribution
… properties of commercial PP grades, of similar molecular weight (MW) and molecular weight distribution (MWD), on printability is still to be investigated. Those commercial PP grades can have wide variation in properties such as Melt Flow Index (MFI), additive content, and polymer architecture …
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Molecular weight modulation in polyhydroxybutyrate fermentations
… most significantly affects elastic behavior is molecular weight. In an effort to understand how molecular weight is formed in PHB production, kinetic studies of PHB fermentations have been performed using fermentation conditions which allow biomass growth and PHB production phases to be …
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Enzymatic Polymerization of High Molecular Weight DNA
… as a directional polyanion that exhibits molecular recognition capabilities. Hence, the efficient and precise synthesis of high molecular weight DNA materials has become key to advance DNA bionanotechnology. Current synthesis methods largely rely on either solid phase chemical synthesis or …
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High Molecular Weight and Polymer-Bound Antioxidants
… a series of sulphur antioxidants of increasing molecular weight and containing the phenolic moiety have furnished evidence for the importance of both the intrinsic antioxidant activity of the additives as well as those of their physical attributes. The latter include: compatibility, solubility …
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Studies on Sucralose-Based Low Molecular Weight Gelators
… of subsequently forming gels are known as low molecular weight gelators (LMWGs). LMWGs usually form “polymer-like” fibers that interact to form a three-dimentional network known as a Self-Assembled Fibrillar Network (SAFIN), which entraps and immobilizes the entire solvent pool to form a …
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Molecular weight growth pathways in fuel-rich combustion
… of both can be placed under the heading of molecular weight growth. Evidence exists for the carcinogenicity of many P AH molecules. Soot is used as a component of dyes and as an additive to rubbers as well as being an undesirable atmospheric pollutant. Both are emitted from many typical …
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Holographic Investigation of Azobenzene-Containing Low-Molecular-Weight Compounds
… relief gratings in azobenzene-containing low-molecular-weight compounds are investigated to obtain a broader understanding of this new class of material. Azobenzene chromophores undergo light-induced trans-cis-trans isomerization cycles leading to a reorientation of the long axis of the …
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Microbial degradation of high molecular weight polycyclic aromatic hydrocarbons
The bacterial degradation of high molecular weight PAHs was investigated by isolating communities and individual strains from a PAH-contaminated site. Microbiological analysis of soils from Port Melbourne, Australia, resulted in the enrichment of five microbial communities capable of degrading …
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Micromechanics of ultra-high molecular weight polyethylene fibre composites
Ultra-high molecular weight polyethylene (UHMWPE) fibre composites are considered to be state-of-the-art materials for penetration and ballistic impact protection applications. The composites are made of strong UHMWPE fibres with a soft compliant matrix. The extreme anisotropy caused by the …
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Microbial cycling of marine high molecular weight dissolved organic matter
… of DOM is limited partly because its exact molecular composition is difficult to constrain and appropriate microbial model systems known to decompose marine DOM are lacking. This thesis identifies marine microorganisms that can serve as model systems to study the metabolic pathways and …
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Elucidating the Ferritin-High Molecular Weight Kininogen Domain 5 Interaction
… occur. One such modulator is derived from high molecular weight kininogen, or HK, a plasma protein involved in the intrinsic blood coagulation pathway. Once HK is cleaved by kallikrein or another protease, HKa is produced, which is capable of reversibly binding to endothelial cells in the …
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Synthesis and characterization of sugar based low molecular weight gelators
<p>Low molecular weight gelators (LMWGs) have gained great attention over the past two decades. These compounds form self-assembled fibrous networks like micelles, cylindrical, sheets, fibers, layers and so on. The fibrous network entraps the solvent and form gel. LMWGs are interesting compounds …
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Glucose and Glucosamine Derivatives as Novel Low Molecular Weight Gelators
Low molecular weight gelators (LMWGs) are small molecules that are capable of entrapping solvents to form a gel in organic solvents or aqueous solution. These compounds rely solely on noncovalent forces to form the fibrous networks necessary to entrap a variety of solvents. The organogels and …
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Synthesis and Characterization of Monosaccharide-derived Low Molecular Weight Gelators
<p>Low molecular weight gelators (LMWGs) are interesting materials whose applications are as diverse and wide ranging as their molecular structures. These materials self-assemble through the formation of non-covelent intermolecular forces and interactions to form supramolecular assemblies that trap …
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Understanding MS/MS fragmentation pathways of small molecular weight molecules
… polarised bond cleavage in protonated pseudo-molecular ions having the potential to be incorporated in mass spectral interpretive software to increase the accuracy of prediction of CID spectra.
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Studies of Reaction Mechanisms Requiring Low Molecular Weight Thiol Cofactors
The methyl-transfer reaction between methylcobalamin and 2-mercapto-ethanesulfonic acid (Coenzyme M) was investigated. We propose that this reaction is a thiyl radical promoted homolytic cleavage of the cobalt-carbon bond rather than the nucleophilic attack by thiolate anion which has been pro
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Orientation of channel die-compressed ultra-high molecular weight polyethylene
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1997.
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Trends and inferred emissions of atmospheric high molecular weight perfluorocarbons
… estimates are presented for the five high molecular weight perfluorocarbons (PFCs): decafluorobutane (C 4 F 1 0 ), dodecafluoropentane (C5 F1 2 ), tetradecafluorohexane (C 6 F14 ), hexadecafluoroheptane (C 7F 16 ) and octadecafluorooctane (C8 F 18 ). Their atmospheric histories are based on …
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