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Showing 13 to 24 of 763 entries
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Cation effects on interfacial water organization of aqueous chloride solutions. I. Monovalent cations: Li+, Na+, K+, and NH4(+).

The journal of physical chemistry. B

Hua W, Verreault D, Huang Z, Adams EM, Allen HC.
PMID: 24798506
J Phys Chem B. 2014 Jul 17;118(28):8433-40. doi: 10.1021/jp503132m. Epub 2014 May 15.

The influence of monovalent cations on the interfacial water organization of alkali (LiCl, NaCl, and KCl) and ammonium chloride (NH4Cl) salt solutions was investigated using surface-sensitive conventional vibrational sum frequency generation (VSFG) and heterodyne-detected (HD-)VSFG spectroscopy. It was found...

N,N-Di-methyl-dehydro-abietyl-ammonium chloride ethanol monosolvate.

Acta crystallographica. Section E, Structure reports online

Huang XZ, Rao XP, Cui YJ.
PMID: 23795117
Acta Crystallogr Sect E Struct Rep Online. 2013 May 25;69:o959. doi: 10.1107/S1600536813013846. Print 2013 Jun 01.

The title compound {systematic name: 1-[(1R,4aS,10aR)-7-isopropyl-1,4a-dimethyl-1,2,3,4,4a,9,10,10a-octa-hydro-phenan-thren-1-yl]-N,N-di-methyl-methanaminium chloride ethanol monosolvate}, C22H36N(+)·Cl(-)·C2H6O, was synthesized from dehydroabietylamine by N-methyl-ation with formaldehyde/formic acid and transformation into the hydro-chloride. The de-hydro-abietyl moiety exhibits the usual conformation with the two cyclo-hexane rings in chair and...

Optimization of Medium Composition for the Production of Neomycin by Streptomyces fradiae NCIM 2418 in Solid State Fermentation.

Biotechnology research international

Vastrad BM, Neelagund SE.
PMID: 25009746
Biotechnol Res Int. 2014;2014:674286. doi: 10.1155/2014/674286. Epub 2014 Jun 09.

Neomycin production of Streptomyces fradiae NCIM 2418 was optimized by using response surface methodology (RSM), which is powerful mathematical approach comprehensively applied in the optimization of solid state fermentation processes. In the first step of optimization, with Placket-Burman design,...

Phase behavior and microstructures in a mixture of anionic Gemini and cationic surfactants.

Soft matter

Fan H, Li B, Yan Y, Huang J, Kang W.
PMID: 24817411
Soft Matter. 2014 Jul 07;10(25):4506-12. doi: 10.1039/c4sm00098f.

We report in this work the phase behavior and microstructures in a mixture of an anionic Gemini surfactant, sodium dilauramino cystine (SDLC), and a conventional cationic surfactant, dodecyl trimethyl ammonium chloride (DTAC). Observation of the appearance shows that the...

Amines That Transport Protons across Bilayer Membranes: Synthesis, Lysosomal Neutralization, and Two-Phase pK(a) Values by NMR.

The Journal of organic chemistry

Dubowchik GM, Padilla L, Edinger K, Firestone RA.
PMID: 11667396
J Org Chem. 1996 Jul 12;61(14):4676-4684. doi: 10.1021/jo960367f.

It is desirable to be able to control the pH of lysosomes. A collection of lipophilic, nitrogenous bases, designed to act as membrane-active, catalytic proton transfer agents, were prepared and their effective pK(a)s measured in a vigorously stirred, two-phase...

Synthesis and Characterization of Optically Active Surfactants Derived from Phenylalanine and Leucine.

Journal of colloid and interface science

Diego-Castro MJ, Hailes HC, Lawrence MJ.
PMID: 11161498
J Colloid Interface Sci. 2001 Feb 01;234(1):122-126. doi: 10.1006/jcis.2000.7285.

Two optically active cationic surfactants, (2S)-N-hexadecyl-N, N-dimethyl-(1-hydroxy-3-phenylpropyl)-2-ammonium chloride 1 and (2S)-N-hexadecyl-N,N-dimethyl-(1-hydroxy-4-methylpentyl)-2-ammonium chloride 2, have been selected and synthesized for use as enantioselective micellar catalysts in aqueous media. Their surface and aggregation behavior has been investigated at 298 K using...

Fluorescence study on the phase transition of hydrogen-bonding gels.

Physical review. E, Statistical, nonlinear, and soft matter physics

Yilmaz Y.
PMID: 12513538
Phys Rev E Stat Nonlin Soft Matter Phys. 2002 Nov;66(5):052801. doi: 10.1103/PhysRevE.66.052801. Epub 2002 Nov 13.

A technique based on steady-state fluorescence measurements is introduced to study the discontinuous volume phase transition of hydrogen-bonding gel. The fluorescence light intensity of pyranine (1-Hydroxypyrene-3, 6, 8-trisulfonic acid) bonded to the gel by means of methacryl amino-propyl-trimethyl ammonium...

Pollution regimes and variability in river water quality across the Humber catchment: interrogation and mapping of an extensive and highly heterogeneous spatial dataset.

The Science of the total environment

Jarvie HP, Oguchi T, Neal C.
PMID: 10847151
Sci Total Environ. 2000 May 05;251:27-43. doi: 10.1016/s0048-9697(00)00412-5.

Water quality inter-relationships based on an extensive Environment Agency database are used to identify seven key types of clean and polluted riverine environments within the Humber catchment. These types were selected on the basis of linear separations between average...

A spectroscopic study of mercury vapor adsorption on gold nanoparticle films.

Journal of colloid and interface science

Morris T, Kloepper K, Wilson S, Szulczewski G.
PMID: 12702424
J Colloid Interface Sci. 2002 Oct 01;254(1):49-55. doi: 10.1006/jcis.2002.8554.

We have modified the surfaces of glass and Si(100) with 3-aminopropyltrimethoxy silane, a fourth generation amine-terminated poly(amidoamine) dendrimer, and poly(diallydimethyl ammonium chloride) to facilitate adsorption onto colloidal gold particles (average diameter 3, 5, 12, and 22 nm). UV-vis absorption...

Analysis of sintered products of iron ore fines by flame atomic absorption spectrometry using a matrix modifier.

Fresenius' journal of analytical chemistry

Chattopadhyay P, Datta P, Jouhari AK.
PMID: 11270219
Fresenius J Anal Chem. 2001 Mar 01;369(5):407-11. doi: 10.1007/s002160000647.

A very precise and accurate method for chemical analysis of sintered products (from iron ore fines in "pot grate furnace") is discussed. A matrix modifier/buffer (a mixture of KCl, tartaric acid, HCl and H2SO4) is used to prevent interference...

Phase Transition Processes in Surfactant Adsorption Layers.

Journal of colloid and interface science

Fainerman VB, Miller R.
PMID: 11097758
J Colloid Interface Sci. 2000 Dec 15;232(2):254-259. doi: 10.1006/jcis.2000.7213.

Adsorption data in the form of surface tension vs bulk concentration isotherms having strong changes in the slope have often been discussed in the literature in terms of phase transitions in the adsorption layer. It will be shown thermodynamically...

Factors affecting the solid-state structure and dimensionality of mercury cyanide/chloride double salts, and NMR characterization of coordination geometries.

Inorganic chemistry

Draper ND, Batchelor RJ, Aguiar PM, Kroeker S, Leznoff DB.
PMID: 15476352
Inorg Chem. 2004 Oct 18;43(21):6557-67. doi: 10.1021/ic049792e.

In the reaction of organic monocationic chlorides or coordinatively saturated metal-ligand complex chlorides with linear, neutral Hg(CN)(2) building blocks, the Lewis-acidic Hg(CN)(2) moieties accept the chloride ligands to form mercury cyanide/chloride double salt anions that in several cases form...

Showing 13 to 24 of 763 entries