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Hydrophilic interaction chromatography print that page

volatile. [ edit ] ERLIC In 2008, Alpert coined the term, ERLIC [ 3 ] ( E lectrostatic R epulsion Hydrophilic Interaction Chromatography), for HILIC separations where an ionic column surface chemistry is used to repel a common ionic polar group on an analyte or within a set of analytes | 2010/9/26 22:52:35

Hydrophile print that page

molecule or other molecular entity that is attracted to, and tends to be dissolved by, water. A hydrophilic molecule or portion of a molecule is one that has a tendency to interact with or be dissolved by water and other polar substances. [ 1 ] [ 2 ] This is thermodynamically favorable | 2010/9/26 19:51:01

Hydrophilic-lipophilic balance print that page

The Hydrophilic -lipophilic balance of a surfactant is a measure of the degree to which it is hydrophilic or lipophilic , determined by calculating values for the different regions of the molecule, as described by Griffin in 1949 [ 1 ] and 1954. [ 2 ] Other methods have been suggested | 2011/4/10 20:53:35

Lipid bilayer print that page


even though they are only a few nanometers thick, they are impermeable to most water-soluble ( hydrophilic ) molecules. Bilayers are particularly impermeable to ions, which allows cells to regulate salt concentrations and pH by pumping ions across their membranes using proteins called ion

Hydrophobic effect print that page


Further reading [ edit ] Amphiphiles Amphiphiles are molecules that have both hydrophobic and hydrophilic domains. Detergents are composed of amphiphiles that allow hydrophobic molecules to be solubilized in water by forming micelles and bilayers (as in soap bubbles ). They are also

Abiogenesis print that page


In natural science , abiogenesis ( pronounced  /ˌeɪbaɪ.ɵˈdʒɛnɨsɪs/ ay -by-oh- jen -ə-siss ) or biopoesis is the study of how biological life arises from inorganic matter through natural processes, and the method by which life on Earth arose. Most amino acids , often called

Chemical biology print that page

Some forms of chemical biology attempt to answer biological questions by directly probing living systems at the chemical level. In contrast to research using biochemistry , genetics , or molecular biology , where mutagenesis can provide a new version of the organism or cell of interest, chemical | 2011/9/16 21:47:03

Amino acid print that page

An alpha-amino acid has the generic formula H 2 NCHRCOOH, where R is an organic substituent ; [ 1 ] the amino group is attached to the carbon atom immediately adjacent to the carboxylate group (the α–carbon ). Other types of amino acid exist when the amino group is attached to a different | 2011/9/29 6:46:08

Xenobiotic metabolism print that page

specifically select substrates from the extracellular mixture. This selective uptake means that most hydrophilic molecules cannot enter cells, since they are not recognised by any specific transporters. [ 2 ] In contrast, the diffusion of hydrophobic compounds across these barriers cannot | 2011/5/19 11:45:45

Enzyme print that page


Like all catalysts, enzymes work by lowering the activation energy ( E a ‡ ) for a reaction, thus dramatically increasing the rate of the reaction. As a result, products are formed faster and reactions reach their equilibrium state more rapidly. Most enzyme reaction rates are millions of