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Hydrophobe - Wikipedia, the free encyclopedia Hydrophobe (from the Greek (hydros) "water" and (phobos) "fear") in chemistry refers to the physical property of a molecule that is repelled by water. Hydrophobic or lipophilic species, or hydrophobes, tend to be electrically neutral and nonpolar, and thus prefer other neutral and nonpolar solvents or molecular environments. Hydrophobic materials are used for oil removal from water, the management of oil spills, and chemical separation processes to remove non-polar from polar compounds. en.wikipedia.org /wiki/Hydrophobic   (281 words)

Merck KGaA - Hydrophobic Interaction -   (Site not responding. Last check: 2007-10-11) High performance hydrophobic interaction chromatography is a very powerful technique for the isolation of proteins in an analytical and preparative scale. The method is based on the interaction between moderately hydrophobic ligands, fixed on the chromatographic support, and the hydrophobic areas located on the surface of proteins. The hydrophobic ligands are presumed to interact with hydrophobic side chains of the protein where an electron donor-acceptor complex is formed. www.merck.de /servlet/PB/menu/1141260   (371 words)

Hydrophobic Hydrophobic molecules are also called lipophilic because they will dissolve in oils and other lipids. In a hydrophobic interaction, although it seems that the hydrophobic molecules are rejecting water, what's actually happening is that water is rejecting the hydrophobic molecules in favour of bonding to itself. Hydrophobic molecules then tend to cluster together, though they're not attracted to each other, because according to thermodynamics, large numbers of like molecules are energetically more favourable than smaller numbers. www.iscid.org /encyclopedia/Hydrophobic   (192 words)

VolSurf Descriptors   (Site not responding. Last check: 2007-10-11) The interaction of molecules with biological membranes is mediated by surface properties such as shape, electrostatic, hydrogen-bonding and hydrophobicity. Descriptors 55-62 "hydrophobic integy moment" describe the distance of the molecular center of mass and the barycenter of hydrophobic interaction regions. Hydrophobic regions indicate interactions with the hydrophobic probe at eight different energy levels, which have been adapted to the energy range of the DRY probe (-0.2 -0.4 -0.6 -0.8 -1.0 -1.2 -1.4 -1.6). www.moldiscovery.com /docs/volsurf/descriptors.html   (1758 words)

Hydrophobic interaction This would suggest that hydrophobic interaction would normally be a good second or subsequent step in an isolation scheme, such as when an ammonium sulfate precipitation occurs prior to the chromatographic protocol. HIC is characterized by the adsorption of compounds to a weakly hydrophobic surface at high salt concentrations, followed by elution with a decreasing salt gradient. Waters hydrophobic interaction columns are packed with rigid, 10 micron polymethacrylate packing materials with 500Å pore size to ensure rapid protein diffusion. www.waters.com /watersdivision/Contentd.asp?ref=JDRS-5LNNQU   (358 words)

Cereal Chem 2000 | Contribution of Hydrophobic Soluble Gluten Proteins, Fractionated by Hydrophobic Interaction ... Hydrophobic interaction chromatography with highly acetylated agarose in 1-mL columns was used to fractionate gliadins and acid-soluble glutenins. Surface hydrophobicity index of gliadins and acetic acid soluble glutenins explained part of the variability of swelling index, extensibility, and work of deformation (dough strength) measured with the alveograph, and part of the farinograph water absorption variability, but showed no relationship to dough mixing characteristics. Hydrophobic soluble gluten proteins fractionated by hydrophobic interaction chromatography (HIC) explained a part of the variability of dough rheological properties. www.aaccnet.org /cerealchemistry/abstracts/2000/1010-02R.asp   (262 words)

Hydrophobic interaction The previously dominant view that hydrophobic processes are governed by perturbation of the near-neighbour hydration structure would thus appear to be an insufficient basis for understanding or modelling these effects. Bowron D.T., Filipponi A., Lobban C. and Finney J.L. Temperature induced disordering of the hydrophobic hydration shell of Kr and Xe. Bowron D.T., Filipponi A., Roberts, M.A., and Finney J.L, Hydrophobic hydration and the formation of a clathrate hydrate. www.cmmp.ucl.ac.uk /people/finney/hi.html   (1369 words)

hydrophobic interaction hydrophobic interaction An interaction between a hydrophobic ('water-hating') part of a molecule and an aqueous environment. Many enzymes have a structure where the polypeptide chain is folded to form a hydrophobic core and a hydrophilic ('water-loving') surface.(From Glossary of Biotechnology for Food and Agriculture) ...of the contributions of each stabilization factor indicate that: (a) the higher stability of Pf 2 is not caused by either a hydrophobic interaction or an... www.mongabay.com /igapo/biotech/hydrophobic_interaction.html   (95 words)

Genetic code - Wikipedia, the free encyclopedia A practical consequence of redundancy is that some errors in the genetic code only cause a silent mutation or an error that would not affect the amino acid's hydrophilic/hydrophobic property; e.g., a codon of NUN (where N = any nucleotide) tends to code for hydrophobic amino acids. The hydrophilic glutamate (Glu) is substituted by the hydrophobic valine (Val), which reduces the solubility of ß-globin. This causes hemoglobin to form linear polymers linked by the hydrophobic interaction between the valine groups causing sickle-cell deformation of erythrocytes. en.wikipedia.org /wiki/Genetic_code   (2023 words)

Hydrophobic interaction chromatography   (Site not responding. Last check: 2007-10-11) This technique fractionates proteins on the basis of their binding to and elution from a hydrophobic matrix, commonly octyl- or phenyl-agarose. Binding of the proteins is often carried out at high salt concentration to favour hydrophobic interactions. This technique is therefore like other general chromatographic procedures such as ion-exchange chromatography and gel filtration in that it relies on differences in a particular physical property of the protein molecules being separated. instruct1.cit.cornell.edu /courses/biobm330/protlab/HIC.html   (147 words)

Hydrophobic Displacement Chromatography   (Site not responding. Last check: 2007-10-11) Hydrophobic interaction chromatographic systems offer a unique selectivity for certain classes of bioseparation problems. The displacers employed for Hydrophobic Displacement Chromatography (HDC) were charged molecules with several short alkyl or aryl groups. Spectroscopy was employed to verify the absence of structural changes to the proteins displaced on these hydrophobic supports. www.rpi.edu /dept/chem-eng/WWW/faculty/cramer/hdc.htm   (204 words)

Monte Carlo Simulations of beta -Hairpin Folding at Constant Temperature -- Sung 76 (1): 164 -- Biophysical Journal folding is driven mainly by the hydrophobic interaction. The energy scale on the left is for the hydrophobic interaction energy (the upper curve) and the total energy (the lower curve). The low Coulomb interaction energy at the period between steps 171 M and 175 M correspond to a transient helical segment between residues 1 and 11. www.biophysj.org /cgi/content/full/76/1/164   (5988 words)

BioChrom Labs, Inc. - HYDROCELL HPLC Column - Hydrophobic Interaction Columns Hydrophobic Interaction Chromatography (HIC) separates proteins by mechanisms similar to Reversed-Phase Chromatography but under gentle reverse salt gradient elution conditions in aqueous buffers. Similarly, C3 3000, C4 3000 and Phenyl 3000 are produced from 10 µm particles of hydrophilic, macroporous PS-DVB beads with average pore diameter of 1500Å. The packing materials have been chemically bonded with allyl (C3), butyl (C4) or phenyl as a hydrophobic group. www.biochrom.com /hydrophobic   (287 words)

[No title]   (Site not responding. Last check: 2007-10-11) Hydrophobic interactions are more correctly called hydrophobic exclusions. Over a period of time the two areas of hydrophobic substances will encounter one another, combine and form one larger hydrophobic region that is excluded from the water matix. This combined state is more energetically favorable than the one in which the hydrophobic substances were separate. academic.brooklyn.cuny.edu /biology/bio4fv/page/hydropho.htm   (180 words)

Solvent effects on the conformational transition of a model polyalanine peptide -- Nguyen et al. 13 (11): 2909 -- ... Hydrophobic side-chains are white, polar side-chains (at chain ends) are dark gray, and backbone atoms are light gray. hydrophobic interaction is present (equivalent to the presence As the hydrophobic interaction strength increases to R = 1/2, www.proteinscience.org /cgi/content/full/13/11/2909   (6346 words)

Publications 2002 It is also found that the 1, 20-eicosanedithiol (HS-(CH -SH) sample forms polyethylene-like rigid long-chain crystals through the intermolecular S…S interaction in contrast to the case of n-alkanes in which each crystalline stem is separated by the CH end groups. Here, the self-assemblies arise as the dynamical fluctuations under the spinodal decomposition situation and the competition between the hydrogen bonding (HB) and the hydrophobic interaction (HPhI) makes the conformation of CDA chains change drastically. In this scheme, the solvent-mediated HB and HPhI play important roles in the structure reorganization of cellulose derivatives in strong electronegative solvents, though HB and HPhI cooperate with the inherent chain helicality. modych.kuicr.kyoto-u.ac.jp /lab/research/publications/2002_en.html   (1294 words)

Dna Human Interaction Protamine Sperm Resource Information Web Site ...in response to its interaction with DNA strand breaks [33,139]. be mediated by the interaction of repetitive elements with... ...comprising PARP, XRCC1, DNA ligase III and DNA poly- interaction seen between these.....and Yang 1 (YY1) [152] and Oct-1 [153], the human.. thednawebsite.com /directory/dna-human-interaction-protamine-sperm.html   (999 words)

Diels-Alder reactions in water: Enforced hydrophobic interaction and hydrogen bonding Diels-Alder reactions in water: Enforced hydrophobic interaction and hydrogen bonding reactions of cyclopentadiene with dienophiles of varying hydrophobicity and A pseudothermodynamic analysis of the rate acceleration in water relative to 1- propanol and 1-propanol-water mixtures provides evidence for two factors dominating the rate enhancement in water: hydrogen-bond stabilization of the polarized activated complex and the decrease of the hydrophobic surface area of the reactants during the activation process. stratingh.eldoc.ub.rug.nl /root/EngbertsJBFN/1995/PureApplChemEngberts   (152 words)

A Simulated Annealing Algorithm for Geometrical Assessment of Macromolecular Hydrophobic Interaction (ResearchIndex)   (Site not responding. Last check: 2007-10-11) If your firewall is blocking outgoing connections to port 3125, you can use these links to download local copies. Abstract: Introduction Macromolecular interaction is critical to many biological and biochemical processes and phenomena in living systems. Its assessmentwould lead to a deeper understanding of many relevant phenomena at the molecular level such as molecular and cellular recognition, signal transmission, and many other processes in life systems, as well as in drug and protein engineering. citeseer.ist.psu.edu /500021.html   (288 words)

PTCL Annual Report 2002 We note especially the appointment by the University of Professor Jeffrey Penfold, who has had prolific interactions with a number of us in the past, as Visiting Professor to the Department for the next three years. Bai, G., Wang, J., Wang, Y., Yan, H. and Thomas, R.K. Thermodynamics of hydrophobic interaction of dissymmetric gemini surfactants in aqueous solutions. Bai, G., Wang, Y., Yan, H., Thomas, R.K. and Kwak, J.C.T. Thermodynamics of interaction between cationic gemini surfactants and hydrophobically modified polymers in aqueous solutions. www.physchem.ox.ac.uk /annual_report/annrep02.html   (5228 words)

Validated Biosystems Publications on Downstream Processing   (Site not responding. Last check: 2007-10-11) P. Gagnon, T. Mayes, and A. Danielsson, 1997, An adaptation of hydrophobic interaction chromatography for estimation of protein solubility optima, J. Pharm. P. Gagnon, J. Henner, S. athmary, P. Grandics, and T. Bekele, 1988, Development of novel hydrophobic interaction chromatography media for the purification of therapeutic proteins, The Engineering Conferences Meeting on Bioprocessing, Kailua-Kona. P. Gagnon, J. Henner, P. Grandics, and S. athmary, 1988, Novel hydrophobic interaction chromatography media for the purification of therapeutic proteins, Meeting of the American Chemical Society, Los Angeles. www.validated.com /revalbio/vbpubs.html   (786 words)

HPLC - Premier Polymeric Hydrophobic Interaction Columns - Shimadzu North America HPLC - Premier Polymeric Hydrophobic Interaction Columns - Shimadzu North America Premier C3 and Phenyl hydrophobic interaction columns (HIC) contain porous hydrophilic rigid polymer packings that have been bonded with either alkyl (C3) or phenyl groups. They are stable in the pH range of 1-13 and are compatible with most organic solvents. www.ssi.shimadzu.com /products/product.cfm?product=hydro   (108 words)

- Darwinism and the Deterioration of the Genome -- TrueOrigin Archive Amino acids from one family can sometimes be interchanged and still produce a functional polypeptide or protein. The random production of amino acids based on frequencies of m-RNA codons would yield too few (only 18.8%) of the charged amino acids that are critical to produce the hydrophobic interaction required to maintain the correct conformational structure of proteins (Ritter, 1996, p. Only 4.7% of the 64 randomly produced codons would lead to the sulfur-containing types of amino acids (methionine and cysteine) necessary for disulfide bonding in proteins. www.trueorigin.org /mutations01.asp   (6609 words)

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