Results 291 to 300 of about 1,609,811 (321)
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Determination of Molecular Weights and Molecular Weight Distribution of Polyacrylamides
SPE Annual Technical Conference and Exhibition, 1984ABSTRACT A high-performance, size-exclusion chromatography procedure has been developed for determining molecular weights and molecular weight distributions of polyacrylamides. The procedure can be applied to dry or emulsion polyacrylamides. Virgin polymers and polymers passed through Berea sandstone cores can be analyzed. The analytical
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Molecular Weight and Molecular Weight Distribution of Kraft Lignins
MRS Proceedings, 1990ABSTRACTKraft lignins are the lignin degradation products from kraft pulping. They are complex, heterogeneous polymers with some polar character. The molecular weight of kraft lignins greatly affect the physical properties of black liquors, and are of primary importance in separation from black liquor and in evaluating potential uses.Several purified ...
Arthur L. Fricke +2 more
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Whale High-Molecular-Weight and Low-Molecular-Weight Kininogens
Thrombosis Research, 2000The expression of high-molecular-weight and low-molecular-weight kininogen mRNAs in the whale liver was examined by reverse transcription-polymerase chain reaction. The nucleotide sequences of the high-molecular-weight and low-molecular-weight kininogen cDNAs were analyzed and deduced to the amino acid sequences.
Umeko Semba +4 more
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Molecular Weights and Molecular-Weight Distributions
1977In synthesizing macromolecules in vitro and in vivo, monodisperse macromolecules (i.e., those in which every molecule has the same molecular weight) only occur under specific mechanistic conditions. The overwhelming majority of reactions proceed more or less randomly, and the resulting macromolecular substance shows a more or less broad molecular ...
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Determination of Molecular Weight and Molecular-Weight Distribution
1977Molecular-weight determination methods can be classed as absolute, equivalent, or relative. Absolute methods allow the molecular weight to be calculated directly from the measured quantities; a knowledge of the physical and chemical structure of the molecules is not required.
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The molecular weight of a-chymotrypsinogen
Biochimica et Biophysica Acta, 1957Abstract The molecular weight of crystalline a-chymotrypsinogen has been determined from amino acid analysis, light-scattering, and sedimentation-diffusion measurements. The values obtained by the use of these methods are, respectively, 25,100, 26,000 and 24,200.
Philip E. Wilcox +3 more
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Journal of Applied Polymer Science, 2006
AbstractThe influence of the polymerization time on the molecular weight (Mw, Mn, Mp, and Mz), molecular weight distribution (MWD) and relative MWD of polypropylene (PP) in the propylene polymerization with a Mg(OEt)2/DIBP/TiCl4/PTES/AlEt3 catalyst system in the slurry phase has been studied by using gel permeation chromatography (GPC), where Mg(OEt)2,
Sadegh Abedi +3 more
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AbstractThe influence of the polymerization time on the molecular weight (Mw, Mn, Mp, and Mz), molecular weight distribution (MWD) and relative MWD of polypropylene (PP) in the propylene polymerization with a Mg(OEt)2/DIBP/TiCl4/PTES/AlEt3 catalyst system in the slurry phase has been studied by using gel permeation chromatography (GPC), where Mg(OEt)2,
Sadegh Abedi +3 more
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Nature, 1962
IN a recent article Wright1 put forward the hypothesis that the molecular weights of the enzymes tabulated by Dixon and Webb2 fall near three series of numbers expressed by 2n × 12,000, 2n × 16,000 and 2n × 19,000, n taking integral values 0–4. This hypothesis was based entirely on the experimental values themselves, mainly by means of graphical ...
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IN a recent article Wright1 put forward the hypothesis that the molecular weights of the enzymes tabulated by Dixon and Webb2 fall near three series of numbers expressed by 2n × 12,000, 2n × 16,000 and 2n × 19,000, n taking integral values 0–4. This hypothesis was based entirely on the experimental values themselves, mainly by means of graphical ...
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Expert Opinion on Pharmacotherapy, 2000
Since its discovery, nearly 90 years, heparin has been used successfully for the treatment of thromboembolic processes. However, therapy with heparin has several important limitations. Most importantly, the poor predictability of its anticoagulant effects has led to the development of the low molecular weight heparins (LMWHs), which are derived from ...
Oscar M Aguilar, Neal S. Kleiman
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Since its discovery, nearly 90 years, heparin has been used successfully for the treatment of thromboembolic processes. However, therapy with heparin has several important limitations. Most importantly, the poor predictability of its anticoagulant effects has led to the development of the low molecular weight heparins (LMWHs), which are derived from ...
Oscar M Aguilar, Neal S. Kleiman
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Molecular weights and molecular-weight distributions from ultracentrifugation of nonideal solutions
Biophysical Chemistry, 1976Ultracentrifugation, membrane osmometry and capillary viscometry experiments have been performed on two dextran samples, which have molecular-weight distributions (MWDs) similar to those of dextrans used as blood plasma extenders. The manufacturer reported values of Mn and MW, determined by end group analysis and by light scattering, respectively.
Peter J. Wan, E.T. Adams
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