Search Results
Results 451 - 500 of 1255
< 5 6 7 8 9 10 11 12 13 14 15 >
Du Wenting - - 2007
The synthesis of docetaxel esters of malic acid is described. These compounds were found to have greatly improved water solubility and are stable in solution at neutral pH. The C2' modified compounds 2a-c and 3a-c behave as prodrugs, that is, docetaxel is generated upon exposure to human plasma, whereas the ...
Guimarães José S JS - - 2007
The objective of this study was to evaluate in vitro the action of eight chemical principles by disinfection efficacy (DE) of Eimeria tenella oocysts. Disinfection efficacy was evaluated by either destruction or sporulation inhibition of the oocysts. Eight treatments were performed: T1 (Glutaraldehyde 42.5 g + Benzalkonium Chloride 7.5 g); ...
Gautier Gwénaëlle - - 2007
A new approach was explored to purify proteins in a multi-step procedure for the characterisation of proteinaceous materials (casein, animal glue, and egg) in artwork samples by gas chromatography-mass spectrometry. High concentrations of inorganic salts, such as azurite, have been found to impair the determination of protein via amino acid ...
Roll Antonie - - 2007
Fumaric acid esters (FAE) are chemical compounds derived from the unsaturated dicarbonic acid fumaric acid. The usage of FAEs in treatment of psoriasis was introduced in the late 1950's. In the 1980s more standardized oral preparations of FAEs were developed containing dimethylfumarate (DMF) and salts of monoethylfumarate (MEF) as main ...
Kelch Brian A - - 2007
Kinetically stable proteins are unique in that their stability is determined solely by kinetic barriers rather than by thermodynamic equilibria. To better understand how kinetic stability promotes protein survival under extreme environmental conditions, we analyzed the unfolding behavior and determined the structure of Nocardiopsis alba Protease A (NAPase), an acid-resistant, ...
Nagai Naoto - - 2007
The THz spectra of amino acids after application of spots of acetone were measured. The 0.6 THz band was commonly observed in many amino acids that formed the intra-molecular salt structure. The band can be attributed to the interaction vibration from the common structural configuration of amino acids and acetone ...
Luangtana-Anan Manee - - 2007
The aim of this study was to increase the stability of shellac because of the polymerization. A few approaches have been applied in this study. Shellac film was prepared in two salt forms, that is, ammonium and 2-methyl-2-amino 1-propanol salts, and a comparison was made with shellac film in free ...
Becker Stephan - - 2007
Hydrophobic bile salts activate NADPH oxidase through a ceramide- and PKCzeta-dependent pathway as an important upstream event of bile salt-induced hepatocyte apoptosis. The mechanisms underlying bile salt-induced ceramide formation have remained unclear to date and thus were studied in rat hepatocytes. Proapoptotic bile salts, such as taurolithocholylsulfate (TLCS), lowered the ...
Le Marrec Claire - - 2007
Growth of the lactic acid bacterium Oenococcus oeni under hyperosmotic constraint was investigated in a chemically defined medium. The bacterium could grow on media with an elevated osmolality, preferably below 1.5 Osm kg(-)(1) H(2)O. At osmolalities comprised between 0.6 and 1.5 Osm kg(-)(1) H(2)O, the growth deficit elicited by the ...
Maugans C - - 2007
Wet oxidation tests were performed on two pure compound streams: acetic acid and ammonia; and on two wastewater streams: acrylic acid wastewater and sulphide laden spent caustic. Test results showed that Mn/Ce and Pt/TiO2 were effective catalysts that greatly enhanced acetic acid, ammonia and acrylic acid wastewater destruction. However, the ...
Beisson Fred - - 2007
Suberin and cutin are fatty acid- and glycerol-based plant polymers that act as pathogen barriers and function in the control of water and solute transport. However, despite important physiological roles, their biosynthetic pathways, including the acyl transfer reactions, remain hypothetical. We report the characterization of two suberin mutants (gpat5-1 and ...
Miura Kazuaki - - 2007
The aquatic risk of 2-sulfonato fatty acid methyl ester sodium salt (MES) used in household detergents was assessed. The environmental exposure assessment expressed as predicted environmental concentration (PEC) was determined on the basis of monitoring results from the seven sites of four rivers in the urban area in Tokyo and ...
Galabov Angel S - - 2007
Virucidal agents are chemical substances that attack and inactivate viral particles outside the cell (virions). In general this is accomplished by damaging their protein shells (capsid) or the substance penetrates the core itself, where it destroys the genetic material. Damage to the virion structure is also possible. These agents are ...
- - 2007
Glycyrrhetinic Acid and its salts and esters and Glycyrrhizic Acid and its salts and esters are cosmetic ingredients that function as flavoring agents or skin-conditioning agents - miscellaneous or both. These chemicals may be isolated from licorice plants. Glycyrrhetinc Acid is described as at least 98% pure, with 0.6% 24-OH-Glycyrrhetinic ...
Bryce David L - - 2006
Trends in the chlorine chemical shift (CS) tensors of amino acid hydrochlorides are investigated in the context of new data obtained at 21.1 T and extensive quantum chemical calculations. The analysis of chlorine-35/37 NMR spectra of solid L-tryptophan hydrochloride obtained at two magnetic field strengths yields the chlorine electric field ...
Tierney Keith B - - 2007
For salmon, amino acid and bile salt detection form the basis for important behaviors including predator evasion and conspecific recognition, respectively. For this reason, decreases in olfactory sensory neuron responses to the amino acid l-serine and the bile salt taurocholic acid (TChA) have been used in studies as indicators of ...
Hanus Martin - - 2006
It has been previously reported that anions in common beverages may bind to bile acid sequestrants (BAS), reducing their capacity for binding bile acid salts. This study examined the ability of the novel BAS colesevelam hydrochloride (HCl), in vitro, to bind bile acid sodium salts following suspension in common beverages. ...
Yokoyama Yuusaku - - 2006
Brominations of unprotected aromatic amino acids such as phenylalanine, tyrosine, and glycine, with bromoisocyanuric acid mono sodium salt (BICA-Na) were conducted in 60% aq. H(2)SO(4) at 0 degrees C to give a mixture of mono-brominated products in good yield. Unexpectedly, meta-bromophenylglycine was obtained as main product accompanied by ortho- and ...
Kim Jae Kwang - - 2007
Salt stress is one of the most important factors limiting plant cultivation. Many investigations of plant response to high salinity have been performed using conventional transcriptomics and/or proteomics approaches. However, transcriptomics and proteomics techniques are not all-encompassing methods that can achieve exclusive insights into the metabolite networks contributing to biochemical ...
Davankov Vadim - - 2006
Based on the results of the earlier proposed process of separation of mixtures of mineral electrolytes by size-exclusion chromatography (SEC), it has been suggested that a mineral salt must spontaneously resolve, at least partially, into its parent acid and base constituents, provided that the separating media discriminates the anion and ...
Crescenzi Francesco - - 2006
The global production of sulfur, which is currently obtained almost exclusively as an involuntary byproduct of the oil and gas industry, is exceeding the market demand so that long term storage or even definitive disposal of elemental sulfur is often needed to handle production surplus. The storage of large quantities ...
Dias Ana S - - 2006
Cesium salts of 12-tungstophosphoric acid, Cs(x)H(3-x)PW(12)O(40) (Cs(x)PW), in the bulk form or supported on medium-pore MCM-41 (3.7 nm) or large-pore (9.6 nm) micelle-templated silicas are active solid acid catalysts for the cyclodehydration of xylose into furfural, in a toluene/water solvent system (T/W) or in dimethyl sulfoxide (DMSO). The catalytic results ...
Dhamodaran T K - - 2007
Eucalyptus grandis is suitable for small timber purposes, but its wood is reported to be non-durable and difficult to treat. Boron compounds being diffusible, and the vacuum-pressure impregnation (VPI) method being more suitable for industrial-scale treatment, the possibility of boron impregnation of partially dry to green timber was investigated using ...
Becalski A - - 2006
Iodoacetic and chloroiodoacetic acids were formed when municipal chlorinated tap water was allowed to react with iodized (with potassium iodide) table salt or with potassium iodide itself. Iodoacetic acid was recently shown to be a potent cytotoxic and genotoxic agent. For analysis, samples were extracted with t-amyl methyl ether and ...
Naeem Aabgeena - - 2006
A systematic investigation of the effect of polyethylene glycols, salts, and alcohols on the trichloroacetic acid (TCA)-induced state of ferricytochrome c was made using various spectroscopic techniques. Native cytochrome c (Cyt c) has a fluorescence maximum at 335 nm, whereas the TCA-induced state of Cyt c has a red shift ...
Schmidt Dietmar - - 2006
5-Hydroxy-3-oxopent-4-enoic acid esters can be efficiently transformed into the stable bis-potassium salts of the corresponding 5-hydroxy-3-oxopent-4-enoic acids, from which the sensitive acids are released in situ, the latter being converted into substituted 4-hydroxy-2H-pyran-2-ones, pyrazoles and isoxazoles under mild conditions; the efficiency of this method is demonstrated by the first synthesis ...
Rozwadowski Z - - 2006
Deuterium isotope effects on 13C chemical shift of tetrabutylammonium salts of Schiff bases, derivatives of amino acids (glycine, L-alanine, L-phenylalanine, L-valine, L-leucine, L-isoleucine and L-methionine) and various ortho-hydroxyaldehydes in CDCl3 have been measured. The results have shown that the tetrabutylammonium salts of the Schiff bases amino acids, being derivatives of ...
Chang Chun-Sheng - - 2007
Immobilized Candida antarctica lipase B catalyzed the synthesis of triglycerides from glycerol and phenylalkanoic acids in a solvent-free system. 4-Phenylbutyric acid was the best acyl donor and displayed the highest synthetic rate of triphenylbutyrin (glyceryl triphenylbutyrate) at 65 degrees C among various phenylalkanoic acids with straight alkyl chains. The external ...
Tian Baozhu - - 2006
Nanocrystalline TiO2 powders were rapidly prepared by hydrolysis of Ti(OC4H9)4 under ultrasound irradiation. The influences of acids (HCl, HNO3, and H2SO4) and their corresponding salts (NaCl, KNO3, and Na2SO4) on the crystalline phase and morphology of products were investigated, respectively. Compared with NaCl and KNO3 that show no evident influence ...
Perez de la Cruz Moreno Mariangeles - - 2006
The solubility of drugs in the gastrointestinal tract is very challenging to simulate with artificial media due to the high complexity of human intestinal fluid (HIF). In particular, bile salt composition, pH and buffer capacity are very important characteristics of HIF, since they determine the solubility of drugs in-vivo. In ...
Arfan Muhammad - - 2007
In order to assess whether exogenous application of salicylic acid (SA) through the rooting medium could modulate the photosynthetic capacity of two wheat cultivars differing in salinity tolerance, a hydroponic experiment was conducted under greenhouse conditions. Seeds of a salt tolerant (S-24) and a moderately salt sensitive (MH-97) cultivar were ...
Greenacre E J - - 2006
Salmonella typhimurium induces an Acid Tolerance Response (ATR) upon exposure to mildly acidic conditions in order to protect itself against severe acid shock. This response can also induce cross-protection to other stresses such as heat and salt. We investigated whether both the acetic acid induced and lactic acid induced ATR ...
Bhat Shreedhar - - 2006
Unnatural bile salts have been synthesized with a cationic group at the side chain of natural bile acids. These cationic bile salts aggregate in water and aqueous salt solutions in a manner similar to their natural counterparts. The critical micellar concentrations of the cationic bile salts were measured using a ...
Stoyanov Evgenii S - - 2006
The N-H stretching frequencies of tri-n-octylammonium salts are reported for a series of weakly basic anions (A(-)), many of which are the conjugate bases of known strong acids and superacids. Data have been collected primarily in carbon tetrachloride, where Oct(3)N(+)-H...A(-) contact ion pairs are formed. In the more polar solvent ...
Panagou E Z - - 2006
The physicochemical, microbiological, and organoleptic profile of different commercial table olive products from retail outlets was studied. Average pH values were 4.00, 3.96, and 4.31 for Spanish-style green, naturally black, and dry-salted olives, respectively, while salt content was 6.21, 7.34, and 8.00% for the same commercial products. Mean values for ...
Kadono Takashi - - 2006
Detergents including fatty acid salts act as surface-active agents and thus possibly damage the plasma membrane structures of aquatic organisms. Therefore, when excess, the house-used and industrial outflows of such detergents into aquatic environments may have considerable impacts on the ecosystem. In this study, we propose the use of green ...
Kim Hugh I - - 2006
A homologous series of anionic gas-phase clusters of dicarboxylic acids (oxalic acid, malonic acid, succinic acid, glutaric acid, and adipic acid) generated via electrospray ionization (ESI) are investigated using collision-induced dissociation (CID). Sodiated clusters with the composition (Na(+))(2)(n+1)(dicarboxylate(2-)(n+1) for singly charged anionic clusters, where n = 1-4, are observed as ...
Tiwari Shashi Kant - - 2006
Methylation of the enantiopure functionalized vinyl sulfoximines 5a-e and 14a-d followed by a F- ion or DBU-mediated isomerization of the vinyl aminosulfoxonium salts 7a-e and 15a-d, respectively, gave the allyl aminosulfoxonium salts 10a-e and 17a-d, respectively. A concomitant intramolecular substitution of the aminosulfoxonium group of 10a-e and 17a-d by the ...
Garreta E - - 2007
A plasma process for the surface modification of HA powders has been developed. Acrylic acid and acrylic acid/octadiene plasma deposited films onto HA particles have demonstrated to interact with SBF allowing the calcium dissolution-precipitation mechanism. Therefore, a nanostructured composite between HA and a self-assembling peptide scaffold (RAD16-I) has been developed. ...
Wang Yanqin - - 2006
In our previous study (Wang, Y. Q.; Yang, C.-M.; Zibrowius, B.; Spliethoff, B.; Lindén, M.; Schüth, F. Chem. Mater. 2003, 15, 5029), mesoporous vinyl-functionalized silica (vinyl silica) with hexagonal P6mm and cubic Ia3d structures has been synthesized at different loadings of vinyl groups and at different concentrations of sodium chloride ...
Rashid F - - 2006
Polyols (glycerol and sorbitol) and salts (magnesium sulfate, sodium sulfate, and magnesium chloride) have been used to study the refolding of the acid-induced state of human placental cystatin (HPC), which is a low molecular weight (12,500 daltons) thiol proteinase inhibitor, in terms of CD spectroscopy, binding of hydrophobic dye 1-anilinonaphthalene-8-sulfonic ...
Mukhopadhyay Aindrila - - 2006
The ability of Desulfovibrio vulgaris Hildenborough to reduce, and therefore contain, toxic and radioactive metal waste has made all factors that affect the physiology of this organism of great interest. Increased salinity is an important and frequent fluctuation faced by D. vulgaris in its natural habitat. In liquid culture, exposure ...
Bai Yong-Xiao - - 2006
A novel mesoporous silica material was synthesized via a silicate salt route in the presence of polyvinyl alcohol as the structure-directing agent under acidic conditions. The material was functionalized and employed as the supports (LPS-1 and LPS-2) for immobilizing triacylglycerol lipase from porcine pancreas (PPL). Not only they had a ...
Voinescu Alina E - - 2006
Changes in pH induced by the addition of electrolytes to buffers, polyelectrolytes (a polycarboxy polymethylene and a polyethyleneimine), and proteins (casein, whey, and lysozyme) solutions are explored systematically. The two buffer systems are triethanolamine/triethanolammonium chloride and citric acid/sodium citrate. These are chosen because of the similarity of their acid-base equilibria ...
Apelblat Alexander - - 2006
A general approach is proposed to analyze electrical conductivities in aqueous solutions of polybasic organic acids. Experimental conductivities are examined in the context of dissociation and hydrolysis reactions by applying the Quint-Viallard conductivity equations and the Debye-Hückel equations for activity coefficients. The proposed numerical procedure is illustrated by the case ...
Qi Sheng - - 2006
Fatty acid-based microspheres may be used for the controlled delivery and taste masking of therapeutic agents, although the mechanisms involved in the release process are poorly understood. In this investigation, microspheres composed of high purity stearic and palmitic acid were prepared using a spray-chilling protocol. In addition, samples of binary ...
Horiguchi Masahiro - - 2006
By the salt formation with particular nonaromatic dicarboxylic acids, rapid and selective photodimerization of 9-(N,N-dimethylaminomethyl)anthracene (1) was accomplished in the solid state. For instance, the salt with trans,trans-muconic acid or acetylenedicarboxylic acid was led quantitatively to the 9,10:4',1' photodimer usy-ht-2, the first example of the unsymmetrical [4+4] photodimerization of anthracene ...
Chitra R - - 2006
In the title 2:1 salt, 2C2H6NO2+.C2O4(2-), the glycine molecule is in the cationic form with a positively charged amino group and an uncharged carboxylic acid group. The doubly charged oxalate anion lies across a crystallographic inversion centre. One of the reasons why the 1:1 glycinium oxalate salt has a higher ...
Fiedler Pavel - - 2006
The structures of ortho-substituted benzoic acids with substituents bearing hydrogen atoms (OH, NH2, COOH and SO2NH2) were investigated by means of IR spectroscopy and of density functional theory at the B3LYP/6-311 + G(d,p) level. All possible conformations, hydrogen bonds, tautomeric forms and zwitterions were taken into consideration and particular attention ...
Douliez Jean-Paul - - 2006
There is considerable interest in constructing supramolecular hollow tube architectures based on amphiphilic molecules. This can be achieved by using relatively expensive synthetic lipids. Herein, we report on the facile preparation of self-assembled microtubes from a novel low-cost lipid mixture that does not require a previous chemical synthesis step and ...
< 5 6 7 8 9 10 11 12 13 14 15 >