*  What does quaternary ammonium compound mean?
Definition of quaternary ammonium compound in the Definitions.net dictionary. Meaning of quaternary ammonium compound. What does quaternary ammonium compound mean? Information and translations of quaternary ammonium compound in the most comprehensive dictionary definitions resource on the web.
  http://www.definitions.net/definition/quaternary%20ammonium%20compound
*  Voltage-dependent block of anthrax toxin channels in planar phospholipid bilayer membranes by symmetric tetraalkylammonium ions...
Previous studies have shown that symmetric tetraalkylammonium ions affect, in a voltage-dependent manner, the conductance of membranes containing many channels formed by the PA65 fragment of anthrax toxin. In this paper we analyze this phenomenon at the single-channel level for tetrabutylammonium ion (Bu4N+). We find that Bu4N+ induces a flickery block of the PA65 channel when present on either side of the membrane, and this block is relieved by large positive voltages on the blocking-ion side. At high frequencies (greater than 2 kHz) we have resolved individual blocking events and measured the dwell times in the blocked and unblocked states. These dwell times have single-exponential distributions, with time constants tau b and tau u that are voltage dependent, consistent with the two-barrier, single-well potential energy diagram that we postulated in our previous paper. The fraction of time the channel spends unblocked [tau u/(tau u + tau b)] as a function of voltage is ...
  http://jgp.rupress.org/content/96/5/921
*  Patent US5698076 - Tissue paper containing a vegetable oil based quaternary ammonium compound - Google Patents
Fibrous cellulose materials useful in the manufacture of soft, absorbent paper products such as paper towels, facial tissues, and toilet tissue are disclosed. The paper products contain a vegetable oil based quaternary ammonium chemical softening compound. Examples of preferred vegetable oil based quaternary ammonium chemical softening compounds include diester di(oleyl)dimethyl ammonium chloride (DEDODMAC) (i.e., di(octadec-z-9-eneoyloxyethyl)dimethyl ammonium chloride) derived from canola oil and/or high oleic safflower oil. Variables that need to be adjusted to maximize the fluidity of vegetable oil based acyl groups include the cis/trans isomer ratio or the Iodine Value (IV) of the fatty acyl groups. The tissue softness is further enhanced by controlling the purity of the fatty acyl groups and the di-substituted versus mono-substituted long chain hydrocarbyl substituent ratio in the ...
  http://www.google.co.uk/patents/US5698076
*  Patent US7358215 - Quaternary ammonium salts as thickening agents for aqueous systems - Google Patents
This invention relates to the use of alkyl amido quaternary ammonium salts, and formulations thereof, as thickening agents in aqueous based fluids, especially those used in oil field applications. The quaternary ammonium salts of the present invention exhibit improved gelling characteristics.
  http://www.google.com/patents/US7358215?dq=6289460
*  75-57-0 - Tetramethylammonium chloride, 97% - A13288 - Alfa Aesar
J. Kathleen Buckner.; William L. Jorgensen. Energetics and hydration of the constituent ion pairs of tetramethylammonium chloride. J. Am. Chem. Soc. 1989, 111 (7),2507-2516 .. Anthony G. Dilella.; Savio L.C. Woo. [49] Hybridization of genomic DNA to oligonucleotide probes in the presence of tetramethylammonium chloride.Methods Enzymol. 1987, 152 447-451 .. Thermally-stable phase-transfer catalyst (see Appendix 2) which has been used in nucleophilic displacement reactions of aryl nitro groups with KF in tetramethylene sulfone: J. Org. Chem., 56, 6406 (1991). A detailed study of the halex Cl - /F - exchange reaction of activated aryl chlorides, for example the conversion of 1,2-dichloro-4-nitrobenzene to 2-chloro-1-fluoro-4-nitrobenzene in DMSO at 120oC showed tetramethylammonium chloride to be superior to other common phase-transfer catalysts. It was necessary to pre-dry the catalyst to ,0.2% water to avoid competition from hydrolytic displacement: Chem. ...
  https://www.alfa.com/ko/catalog/A13288/
*  Rapid assay for determination of water soluble quaternary ammonium compounds
The periodide method for quaternary ammonium compounds (QAC) analysis was modified to permit rapid screening of numerous replicate plant samples. This procedure provides a valuable..
  https://www.omicsonline.org/references/rapid-assay-for-determination-of-water-soluble-quaternary-ammonium-compounds-945928.html
*  Quaternary ammonium compounds, C12-18-alkyl(hydroxyethyl)dimethyl,chlorides - Surfactants - SAAPedia - Page1
Quaternary ammonium compounds, C12-18-alkyl(hydroxyethyl)dimethyl,chlorides - Surfactants - SAAPedia - SAAPedia, Detailed description of the surfactant characteristics, uses - Page1
  http://www.saapedia.org/en/saa/?type=detail&id=3822
*  Quaternary ammonium compounds, di-C16-18-alkyldimethyl, salts with hectorite - Surfactants - SAAPedia - Page1
Quaternary ammonium compounds, di-C16-18-alkyldimethyl, salts with hectorite - Surfactants - SAAPedia - SAAPedia, Detailed description of the surfactant characteristics, uses - Page1
  http://www.saapedia.org/en/saa/?type=detail&id=6359
*  ChemIDplus - 91080-28-3 - Quaternary ammonium compounds, benzyl-C14-18-alkylbis(hydroxyethyl), chlorides - Searchable synonyms,...
91080-28-3 - Quaternary ammonium compounds, benzyl-C14-18-alkylbis(hydroxyethyl), chlorides - Searchable synonyms, formulas, resource links, and other chemical information.
  https://chem.nlm.nih.gov/chemidplus/rn/91080-28-3
*  ChemIDplus - 68071-91-0 - Quaternary ammonium compounds, coco alkylethylbis(hydroxyethyl), ethoxylated, Et sulfates (salts) -...
68071-91-0 - Quaternary ammonium compounds, coco alkylethylbis(hydroxyethyl), ethoxylated, Et sulfates (salts) - Searchable synonyms, formulas, resource links, and other chemical information.
  https://chem.nlm.nih.gov/chemidplus/rn/68071-91-0
*  ChemIDplus - 91721-91-4 - Quaternary ammonium compounds, di-C10-18-alkyldimethyl, chlorides - Searchable synonyms, formulas,...
91721-91-4 - Quaternary ammonium compounds, di-C10-18-alkyldimethyl, chlorides - Searchable synonyms, formulas, resource links, and other chemical information.
  https://chem.nlm.nih.gov/chemidplus/rn/91721-91-4
*  ChemIDplus - 92061-69-3 - Quaternary ammonium compounds, di-C6-14-alkyldimethyl, salts with 4-bromo-2,6-dimethylphenol -...
92061-69-3 - Quaternary ammonium compounds, di-C6-14-alkyldimethyl, salts with 4-bromo-2,6-dimethylphenol - Searchable synonyms, formulas, resource links, and other chemical information.
  https://chem.nlm.nih.gov/chemidplus/rn/92061-69-3
*  ChemIDplus - 61788-79-2 - Quaternary ammonium compounds, (2-hydroxy-1,3-propanediyl)bis(coco alkyldimethyl, dichlorides -...
61788-79-2 - Quaternary ammonium compounds, (2-hydroxy-1,3-propanediyl)bis(coco alkyldimethyl, dichlorides - Searchable synonyms, formulas, resource links, and other chemical information.
  https://chem.nlm.nih.gov/chemidplus/rn/61788-79-2
*  Quaternary Ammonium Compounds Supplier - KG International
With 30 years of experience, KGI is a Quaternary Ammonium Compounds Supplier w/ quality support. Bulk orders for all the Americas. Get a free consultation!
  http://www.kgint.com/product-quaternary-compounds.php
*  Ammonium Compounds in Vadodara,Ammonium Compounds Manufacturers and Suppliers from india
Business Directory for Ammonium Compounds Suppliers in Vadodara - Get contact details of Ammonium Compounds Manufacturers, Wholesale Ammonium Compounds Exporters, Best Ammonium Compounds Traders & Distributors Across the Vadodara.
  http://www.indianyellowpages.com/vadodara/ammonium-compounds.htm
*  Electrical Conductivity Studies of Tetraalkylammonium Bromides in Aqueous Solutions at Several Temperatures -...
The molar elec. conductivities of tetramethylammonium, tetraethylamonium, tetra-n-propylammonium, and tetra-n-butylammomium bromides in aq. solns. at (278.15, 283.15, 288.15, 293.15, and 298.15) K have been measured in the concn. range from (0.002 to 0.04) mol·kg-1. The data were analyzed according to the low-concn. chem. model (lcCM) of Barthel. Values of the limiting molar conductivities, Λ∞, and assocn. consts., KA, were evaluated. Using known values for the limiting molar cond. of bromide ion, the limiting molar conductivities of the tetraalkylammonium cations were evaluated at all temps. The Walden product and the Eyring activation enthalpy were calcd. The results are discussed in terms of solute-solvent interactions. ...
  https://epub.uni-regensburg.de/25992/
*  Molecular Dynamics Simulations of Adsorption of Poly(acrylic acid) and Poly(methacrylic acid) on Dodecyltrimethylammonium...
We have investigated the interaction of dodecyltrimethylammonium chloride (DoTA) micelle with weak polyelectrolytes, poly(acrylic acid) and poly(methacrylic acid). Anionic as well as un-ionized forms of the polyelectrolytes were studied. Polyelectrolyte-surfactant complexes were formed within 5-11 ns of the simulation time and were found to be stable. Association is driven purely by electrostatic interactions for anionic chains whereas dispersion interactions also play a dominant role in the case of un-ionized chains. Surfactant headgroup nitrogen atoms are in close contact with the carboxylic oxygens of the polyelectrolyte chain at a distance of 0.35 nm. In the complexes, the polyelectrolyte chains are adsorbed on to the hydrophilic micellar surface and do not penetrate into the hydrophobic core of the micelle. Polyacrylate chain shows higher affinity for complex formation with DoTA as compared to polymethacrylate chain. Anionic polyelectrolyte chains show higher interaction strength as ...
  https://www.semanticscholar.org/paper/Molecular-Dynamics-Simulations-of-Adsorption-of-Po-Sulatha-Natarajan/a580362b7133ee1beb7221af9100114f748fd719
*  Electrolytic Solution - Patent application
0057]Examples of an organic metallic salt for capacitors are tetraalkyl quaternary ammonium salts represented by (Me)x(Et)yN, where Me is methylene, Et is ethylene, x and y are the same or different, and each is 0 or an integer of 1 to 4 and x+y=4. Specifically there are Et4NBF4, Et4NClO4, Et4NPF6, Et4NAsF6, Et4NSbF6, Et4NCF3SO3, Et4N(CF3SO2)2N, Et4NC4F9SO3, Et3MeBF4, Et3MeClO4, Et3MePF6, Et3MeAsF6, Et3MeSbF6, Et3MeCF3SO3, Et3Me(CF3SO2)2N and Et3MeC4F9SO3, and it is particularly preferable to use Et4NBF4, Et4NPF6, Et4NSbF6 and Et4NAsF6. In addition, of these tetraalkyl quaternary ammonium salts, it is desirable to use quaternary ammonium salts in which one or two alkyls are ethers, from the viewpoint of decrease in viscosity. For example, N,N-diethyl-N-methyl-N-(2-methoxyethyl)ammonium salt and the like are preferable since viscosity is low. Also spirobipyrrolidinium or its salt obtained by ...
  http://www.patentsencyclopedia.com/app/20090291364
*  Dodecyltrimethylammonium bromide for ion pair chromatography, ≥98.5% (AT) | Sigma-Aldrich
Sigma-Aldrich offers Sigma-Aldrich-44239, Dodecyltrimethylammonium bromide for your research needs. Find product specific information including CAS, MSDS, protocols and references.
  https://www.sigmaaldrich.com/catalog/product/sial/44239?lang=en®ion=US
*  Tetramethylammonium hydroxide solution semiconductor grade PURANAL™ (Honeywell 17741) | Sigma-Aldrich
Sigma-Aldrich offers Aldrich-40265, Tetramethylammonium hydroxide solution for your research needs. Find product specific information including CAS, MSDS, protocols and references.
  http://www.sigmaaldrich.com/catalog/product/aldrich/40265?lang=en®ion=US
*  Research Programs : Department of Biological Sciences
Salmonella Strains with Reduced Susceptibility (SRS) to Quaternary Ammonium Compounds. This has been a long term project in our laboratory. We have generated strains of Salmonella with reduced susceptibility to quaternary ammonium compounds. In our studies we have attempted to determine what physiological changes have occurred in all of the SRS strains that account for their ability to survive in the presence of the antimicrobial agent. We have demonstrated membrane changes as well as an increase in efflux pump activity. We have also observed that the three SRS strains lack fimbriae and were less able to infect human Caco-2 cells than the parent strain. We are currently studying cross resistance of SRS strains to a variety of antibiotics ...
  http://www.bio.udel.edu/our-research/programs
*  EWG's Guide to Healthy Cleaning | QUATERNARY AMMONIUM COMPOUNDS, BENZYL-C8-18-ALKYLDIMETHYL, CHLORIDES | Substance
About the ratings: EWG provides information on cleaning product ingredients from the published scientific literature, to supplement incomplete data available from companies and the government. The ratings indicate the relative level of concern posed by exposure to the ingredients in this product - not the product itself - compared to other product formulations. The ratings reflect potential health hazards but do not account for the level of exposure or individual susceptibility, factors which determine actual health risks, if any ...
  http://www.ewg.org/guides/substances/22127
*  Complex of Polymeric Quaternary Ammonium and Anionic Polymers as a New Antimicrobial Agent for Ophthalmic Compositions - Patent...
0031]Disclosed herein are ophthalmic solutions and methods for their use, which comprise a complex of at least one cationic compound and at least one an anionic polymer. In one embodiment, the complex can comprise a first and second cationic compound. In one embodiment, the first and second cationic compounds are antimicrobial agents. In one embodiment, the first cationic compound can be a polymeric quaternary ammonium compound. In one embodiment, the complex is formed of a first cationic component, a second cationic component and an anionic polymer. The complex can be used as an antimicrobial agent or as an antimicrobial component. The antimicrobial complexes disclosed herein can provide enhanced biocidal activity over other antimicrobial agents, without significantly contributing to ocular irritation or user discomfort. Typically, when mixing hydrophilic anionic polymers with cationic polymeric antimicrobial agents, formation of precipitates occurs and the ...
  http://www.patentsencyclopedia.com/app/20100234319
*  OPTICALLY ACTIVE QUATERNARY AMMONIUM SALT HAVING AXIAL ASYMMETRY AND PROCESS FOR PRODUCING a-AMINO ACID AND DERIVATIVE...
NR20R21 (where R20 and R21 are each independently a hydrogen atom or a C1 to C4 alkyl group), a nitro group, a carbamoyl group, an N--(C1 to C4 alkyl)carbamoyl group, an N,N-di(C1 to C4 alkyl)carbamoyl group, or --NHCOR9 (where R9 is a C1 to C4 alkyl group that may be branched), a cyano group, --NR20R21 (where R20 and R21 are each independently a hydrogen atom or a C1 to C4 alkyl group), a nitro group, a carbamoyl group, an N--(C1 to C4 alkyl)carbamoyl group, an N,N-di(C1 to C4 alkyl)carbamoyl group, --NHCOR9 (where R9 is a C1 to C4 alkyl group that may be branched), and a halogen atom; and n is an integer from 1 to 12); (ix) --(CH2)nNR12COR13 (where R12 and R13 are groups independently selected from the group consisting of: (1) a hydrogen atom; (2) a C1 to C4 alkyl group that may be branched; (3) an aryl group, wherein the aryl group may be substituted with at least one group selected from the group consisting of: a C1 to C4 alkyl group that may be branched, a C1 to C5 alkoxy group that may be ...
  http://www.patentsencyclopedia.com/app/20110152562