desalination
desalination Extraction of pure water (for drinking, industrial and chemical uses, or for irrigation) from water containing dissolved salts, usually sea water. The commonest and oldest method is
distillation. Another method is to freeze the salt solution; salt is excluded from the ice crystals which can then be melted. In reverse
osmosis, pure water only passes through a semipermeable membrane against which salt water is pressurized. Other methods include electrodialysis.
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Effect of molecular weight on crystallization and melting of poly(trimethylene terephthalate). 1: Isothermal and dynamic crystallization.
Magazine article from: Polymer Engineering and Science; 10/1/2001; ; 700+ words
; ...melt even in the molecular weight range of [M.sub.n...the influence of molecular weight on either the isothermal and...PTT samples with different molecular weights were synthesized via trans...PTT samples with different molecular weights were measured at the...
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Ultrafiltered perfluoropolyether lubricant under molecular weight distributin control
Magazine article from: Tribology Transactions; 10/1/2000; ; 700+ words
; ...have a close relation to the molecular weight distribution. The commercial...lubricants which have different molecular weights and chain-end functionalities...lubricant for magnetic disks has a molecular weight distribution which ranges from...
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Determination of [beta]-glucan molecular weight using SEC with calcofluor detection in cereal extracts
Magazine article from: Cereal Chemistry; 7/1/2003; ; 700+ words
; ...each fraction covers a narrow molecular weight range, while at the same time...together cover the whole range of molecular weights. So far, there are no [beta...fulfill these criteria. The molecular weight of [beta]-glucan is often...
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Select the right hydrocarbon molecular weight correlation
Magazine article from: Chemical Engineering Progress; 12/1/1998; ; 700+ words
; ...Because it is difficult to determine molecular weights of hydrocarbon fractions experimentally, molecular weight is one physical characteristic that...developed to predict pseudocomponent molecular weights. These correlations are usually...
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Molecular Weight Distribution of [beta]-Glucan in Oat-Based Foods
Magazine article from: Cereal Chemistry; 5/1/2004; ; 700+ words
; ...thermostable [alpha]-amylase. Average molecular weight and molecular weight distributions of [beta]-glucan in extracts...concentrates all had high Calcofluor average molecular weights (206 10^sup 4^ to 230 10^sup 4^ g...
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Antitumor Effects of Various Low-Molecular-Weight Chitosans Are Due to Increased Natural Killer Activity of Intestinal Intraepithelial Lymphocytes in Sarcoma 180-Bearing Mice1
Magazine article from: The Journal of Nutrition; 4/1/2004; ; 700+ words
; ...chitosan (average molecular weight, 650 kDa) had low...chitosans with different molecular weights in sarcoma 180-bearing...low-molecular-weight chitosan * antitumor...polymers that have molecular weights of ~1000 kDa and...
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Determining the molecular weight distribution of cotton cellulose: A new GPC solvent
Magazine article from: Textile Research Journal; 2/1/2002; ; 700+ words
; ...including the high molecular weight cellulose of cotton...F. P., Molecular Weight Characterization of...Z. S., Cellulose Molecular Weights by GPC/LiCl-DMAc...Howley, P. S., Molecular Weight of Cotton Cellulose...
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Effect of moisture and molecular weight.(New Developments in the Melt Rheology of Nylons (Part 1))
Magazine article from: Polymer Engineering and Science; 7/15/1996; ; 700+ words
; ...kcal/mol, independent of molecular weight. Finally, Pezzin and...to be proportional to the molecular weight to the 3.4 power, which although...polyolefins above their critical molecular weights (5-14). In 1972, Conti...
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High Molecular Weight Poly(ethylene oxide)-Based Drug Delivery Systems: Part I: Hydrogels and Hydrophilic Matrix Systems
Magazine article from: Pharmaceutical Technology; 5/1/2005; ; 700+ words
; ...ionic, high molecular weight, water-soluble polymers...available with average molecular weights from 200 to 7 10^sup 6^. Products with a molecular weight less than -25,000...in this review have a molecular range from ~1 10...
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Effect of Molecular Weight and Branch Structure on the Crystallization and Rheological Properties of Poly(butylene adipate).(Statistical Data Included)
Magazine article from: Polymer Engineering and Science; 7/1/2001; ; 700+ words
; ...decreased with increasing molecular weight. For comparable molecular weights, the branched PBAs had...as white powder. Equal weights of hydroxy and acid end...excess chloroform. High molecular weight PBAs were obtained by...
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molecular weight
Book article from: The Columbia Encyclopedia, Sixth Edition
...ionic compounds such as common salt, are not made up of molecules and thus have neither a molecular formula nor a molecular weight. Molecular weights of substances may be determined experimentally in various ways, the method employed usually...
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Molecular Weight
Encyclopedia entry from: The Gale Encyclopedia of Science
...Molecular Weight Molecular weight (MW) is the sum of the atomic weights of the atoms...Although molecular weight is often used...and molecular weights. The classical...determining the molecular weight of a gas is to...
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gram-molecular weight
Book article from: The Columbia Encyclopedia, Sixth Edition
gram-molecular weight amount of a molecular substance whose weight, in grams, is numerically equal to the molecular weight of that substance. For example, one gram-molecular...
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weight-average molecular weight
Book article from: The Columbia Encyclopedia, Sixth Edition
weight-average molecular weight see molecular weight .
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number-average molecular weight
Book article from: The Columbia Encyclopedia, Sixth Edition
number-average molecular weight see molecular weight .
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