Search Results
Results 1 - 50 of 1856
1 2 3 4 5 6 7 8 9 10 >
Holm Lars L 1Bispebjerg Hospital and University of Copenhagen, Faculty of Health and Medical - - 2014
Muscle protein synthesis (MPS) rate is conventionally determined by obtaining two or more tissue biopsies during a primed continuous infusion of a stable isotopically labeled amino acid. The purpose of the present study was to test whether tracer priming given as a flooding dose, thereby securing an instantaneous labeling of ...
Amory John K JK Department of Medicine, University of Washington, Seattle, Washington. Electronic address: - - 2014
To determine whether decreased testicular levels of enzymes necessary for retinoic acid biosynthesis were associated with male infertility, as retinoic acid is known to be necessary for spermatogenesis. Observational analysis of testicular tissue samples, sperm indices, and serum hormone concentrations. Two infertility centers in Chile. 32 infertile men and 11 ...
Hoffman Arthur - - 2013
Traditional surveillance in patients with Barrett's esophagus (BE) has relied on random biopsies. Targeted biopsies that use advanced imaging modalities may significantly improve detection of specialized columnar epithelium (SCE). We compared the efficacy of targeted biopsies that used i-scan or acetic acid to random biopsies in the detection of SCE. ...
Kanaley Jill A JA Mayo Clinic, Rochester, - - 2013
We hypothesized that insulin alters plasma free fatty acid (FFA) trafficking into intramyocellular (im) long-chain acylcarnitines (imLCAC) and triglycerides (imTG). Overnight-fasted adults (n = 41) received intravenous infusions of [U-¹³C]palmitate (0400-0900 h) and [U-¹³C]oleate (0800-1400 h) to label imTG and imLCAC. A euglycemic-hyperinsulinemic (1.0 mU·kg fat-free mass⁻¹·min⁻¹) clamp (0800-1400 h) ...
Nya-Ngatchou J J JJ Departments of Medicine, University of Washington, Seattle, WA 98195, - - 2013
Intratesticular retinoic acid is necessary for spermatogenesis, but the relationship between intratesticular retinoic acid and sperm quality in man has not been studied. We hypothesized that intratesticular concentrations of retinoic acid would be lower in men with abnormal semen analyses compared to men with normal semen analyses. We recruited men ...
Agler Matthew T - - 2012
To maximize the production of carboxylic acids with open cultures of microbial consortia (reactor microbiomes), we performed experiments to understand which factors affect the community dynamics and performance parameters. We operated six thermophilic (55°C) bioreactors to test how the factors: i. biomass pretreatment; ii. bioreactor operating conditions; and iii. bioreactor ...
Brasile Giuseppina - - 2012
An efficient method for the synthesis of long-chain α,ω-diamino acids, starting from natural α-amino acids, has been developed. The long-chain skeleton has been generated through condensation between a protected aldehyde, derived from L: -aspartic acid, and an ylide obtained from an ω-hydroxy-alkyl phosphonium salt. After conversion of the ω-hydroxy group ...
Dobretsov G E - - 2012
Albumin is a carrier of nonesterified long-chain fatty acids and many other ligands. The status of its binding centers was studied for various proportions of nonesterified long-chain fatty acids and albumin as exemplified by palmitic acid. The status of the binding center was tested by recording K-35 probe fluorescence decay ...
Swoboda Marko M B CUBE, Center for Molecular Bioengineering, Technische Universität Dresden, Arnoldstraße 18, 01307 Dresden, - - 2012
Over the past years, bottom-up bionanotechnology has been developed as a promising tool for future technological applications. Many of these biomolecule-based assemblies are characterized using various single-molecule techniques that require strict anaerobic conditions. The most common oxygen scavengers for single-molecule experiments are glucose oxidase and catalase (GOC) or protocatechuate dioxygenase ...
Voigt Christian C - - 2012
In contrast to birds, bats are possibly limited in their capacity to use body fat as an energy source for long migrations. Here, we studied the fuel choice of migratory Pipistrellus nathusii (approximate weight: 8 g) by analysing the stable carbon isotope ratio (δ(13)C(V-PDB)) of breath and potential energy sources. ...
Barbieri Manuela - - 2012
The fate of the three environmentally relevant β-blockers atenolol, metoprolol and propranolol has been studied in batch experiments involving aquifer material and nitrate reducing conditions. Results from the about 90d long tests indicate that abiotic processes, most likely sorption, jointly with biotransformation to atenololic acid were responsible for the 65% ...
Zhang Dong Qing - - 2012
This study evaluated the effect of continuous and batch feeding on the removal of 8 pharmaceuticals (carbamazepine, naproxen, diclofenac, ibuprofen, caffeine, salicylic acid, ketoprofen and clofibric acid) from synthetic wastewater in mesocosm-scale constructed wetlands (CWs). Both loading modes were operated at hydraulic application rates of 5.6 cm day(-1) and 2.8 cm day(-1). Except for ...
Fuereder Markus - - 2012
Teicoplanin aglycone-based chromatography columns (Chirobiotic TAG) enable amino acid enantioseparation with aqueous mobile phases, which perfectly accommodates the distinct hydrophilicity of most amino acids. Therefore, this stationary phase constitutes a promising option in particular for preparative-scale separations that require high feed concentrations for economic operation. However, detailed studies revealed a ...
Chen Lijun - - 2012
This paper introduces a novel process for recovery and refining of l-lactic acid from a fermentation broth. The use of a solvent extraction step, in the novel approach, has significant impacts on the following centrifugal short-path distillation conditions (operating pressure, evaporator temperature and feed flow rate). As the conditions were ...
Mathia František - - 2012
Bi(OTf)(3)·nH(2)O was found to be an efficient promoter of the cyclisative hydroamination of unactivated alkenyl sulfonamides, giving rise to the N-protected 2-methyl pyrrolidines in good to excellent yields (up to 95%). Based on control experiments, a joint Lewis acid-Brønsted acid catalysis might be in operation, or triflic acid itself, generated ...
Conde-Frieboes Kilian - - 2012
We report in vitro and in vivo data of new α-melanocyte-stimulating hormone (α-MSH) analogues which are N-terminal modified with a long chain fatty acid derivative. While keeping the pharmacophoric motif (d-Phe-Arg-Trp) fixed, we tried to improve selectivity and physicochemical parameters like solubility and stability of these analogues by replacing amino ...
Harden Charlotte J - - 2012
Long-chain fatty acids have been shown to suppress appetite and reduce energy intake (EI) by stimulating the release of gastrointestinal hormones such as cholecystokinin (CCK). The effect of NEFA acyl chain length on these parameters is not comprehensively understood. An in vitro screen tested the capacity of individual NEFA (C12 ...
Rendina Victor L - - 2012
A new protocol for titrating nonstabilized diazoalkane solutions by quantitative (19)F NMR is reported. An excess of 2-fluorobenzoic acid dissolved in CDCl(3) is treated with the diazoalkane solution at a low temperature, immediately forming the corresponding 2-fluorobenzoate ester upon warming. A significant difference in the (19)F chemical shift between the ...
Coblentz W K - - 2012
During 2009 and 2010, alfalfa (Medicago sativa L.) hays from 2 cuttings harvested from the same field site were used to evaluate the effects of a propionic acid-based preservative on the storage characteristics and nutritive value of hays stored as large round bales. A total of 87 large round bales ...
Serrano-Medina A - - 2011
The synthesis and properties of thermal/pH-sensitive core-shell copolymer nano/microgels were investigated. The crosslinked core consisted of N-isopropylacrylamide (NIPAAm) while the shell was stabilized by poly(ethylene glycol) methyl ether methacrylate (PEGMA) and 2-methacryloyloxybenzoic acid (2MBA) using a "one pot" soapless emulsion polymerization method. Monodisperse particles were produced with average hydrodynamic diameters ...
Kurita Y - - 2011
Chitosan was reacted with four alkyl halides, monobromoacetic acid, benzyl bromide, 2-bromoethanol, and monochloroacetic acid, in the presence of NaHCO(3) in water. Chemical structures, degrees of substitution, and degrees of polymerization of reaction products were studied by FT-IR, NMR, SEC-MALLS, and elementary analyses. All alkyl groups were introduced selectively into ...
Ré Martín D - - 2011
BACKGROUND: Tomato fruit is of prime importance owing to its qualities for human nutrition and its economic value. In order to extend its commercial life, it is harvested at mature but unripe stages and stored at low temperatures. The goal of this work was to study the influence of harvest ...
Watanabe Nobuko - - 2011
Diphenylparabanic acid 4 was found to react with >2 eq of organolithiums at -78 degrees C to effectively give the corresponding symmetrical alpha-diketones 5. However, upon treatment with 1 eq of organolithium, 4 gave mainly 5-substituted 5-hydroxyimidazolidine-2,4-diones 7. On the other hand, Grignard reagents were less reactive toward 4 at ...
Yemiş Gökçe Polat - - 2011
Preservatives could be part of an effective intervention strategy for the control of Cronobacter species in foods, but few compounds with the desired antimicrobial properties have been identified to date. We examined the antibacterial activity of vanillin, ethyl vanillin, and vanillic acid against seven Cronobacter spp. in quarter-strength tryptic soy ...
Bromberg Lev - - 2011
Porous materials based on chromium (III) terephthalate metal organic frameworks (MIL-101) and their composites with phosphotungstic acid (PTA) were studied as heterogeneous acid catalysts in aldehyde-alcohol reactions exemplified by acetaldehyde-phenol (A-P) condensation and dimethylacetal formation from benzaldehyde and methanol (B-M reaction). The MIL-101 was synthesized solvothermically in water, and the ...
Stefanov Ivan - - 2011
The feasibility of Raman spectroscopy in combination with partial least squares (PLS) regression for determination of individual or grouped trans monounsaturated fatty acids (trans MUFA) and conjugated linoleic acids (CLA) in milk fat is demonstrated using spectra obtained at two temperature conditions: room temperature and after freezing at -80oC. The ...
Chen Zhuo - - 2011
Stichococcus, a genus of green algae, distributes in ice-free areas throughout Antarctica. To understand adaptive strategies of Stichococcus to permanently cold environments, the physiological responses to temperature of two psychrotolerants, S. bacillaris NJ-10 and S. minutus NJ-17, isolated from rock surfaces in Antarctica were compared with that of one temperate ...
Rosa Antonella - - 2012
The salted and semidried mullet (Mugil cephalus) ovary product (bottarga) is proposed as an important source of the long-chain n-3 polyunsaturated fatty acids (PUFA), eicosapentaenoic acid, and docosahexaenoic acid. In this work, we investigated the extent of lipid oxidation and browning of grated bottarga samples during 7 mo of storage ...
McClintock Sean Peter - - 2011
A new method for the generation of dicationic species via ionization of diols is described. The method makes use of milder reagents at room temperatures, an advantage over use of Magic Acid at -78 degrees C. A series of mono- and dications were synthesized successfully, including previously unattainable species.
Hashem Ahmed Abdel Rahman - - 2012
The aim of this study was to compare the effect of acidic environment on the dislodgement resistance of mineral trioxide aggregate (MTA) and Bioaggregate (Innovative BioCeramix, Vancouver, Canada) when used as perforation repair materials. Eighty, human, mandibular molars were used. Perforations were made in the furcation of each molar and ...
Bicho Natalina Cavaco - - 2011
Arabica and Robusta coffee beans were roasted at 220 ± 10°C for 7, 9 and 11 min to identify chemical descriptors in the beverages. The pH of the beverages showed the lowest value in the medium roasting level. In each degree of browning, the soluble solids content remained slightly higher in Arabica drinks. ...
Ujihara Kazuya - - 2011
Development of pyrethroids for household use and recent advances in the syntheses of (1R)-trans-chrysanthemic acid, the acid moiety of most of the household pyrethroids, are reviewed. As another important acid moiety, we discovered norchrysanthemic acid to have a significant vapor action at room temperature when esterified with fluorobenzyl alcohols. In ...
Findrik Zvjezdana - - 2011
In this paper esterification of ethanol and lactic acid catalyzed by Candida antarctica B (Novozyme 435) in ionic liquid (Cyphos 104) was studied. The influence of different variables on lipase enantioselectivity and lactic acid conversion was investigated. The variables investigated were ionic liquid mass/lipase mass ratio, water content, alcohol excess ...
Madeo Moira - - 2011
Understanding the molecular basis of acid tolerance in the food-borne pathogen Listeria monocytogenes is important as this property contributes to survival in the food-chain and enhances survival within infected hosts. The aim of this study was to identify genes contributing to acid tolerance in L. monocytogenes using transposon mutagenesis and subsequently ...
Dang Tuan Thanh - - 2011
The generation of a hidden Brønsted acid as a true catalytic species in hydroalkoxylation reactions from metal precatalysts has been clarified in case studies. The mechanism of triflic acid (CF(3)SO(3)H or HOTf) generation starting either from AgOTf in 1,2-dichloroethane (DCE) or from a Cp*RuCl(2)/AgOTf/phosphane combination in toluene has been elucidated. ...
Hachana Y - - 2011
For yoghurts were made from milk with different levels of somatic cell count (SCC) (low 95,000 cells ml(- 1), intermediate 398,000 cells ml(- 1) and high 1,150,000 cells ml(- 1)). Yoghurt samples were analysed for the degree of proteolysis, lipolysis (free fatty acid (FFA) content), acidity, pH and apparent viscosity on days 1, 14 and 28. The SCC had ...
Sui Xian-Wei - - 2011
Fast pyrolysis of bagasse pretreated by sulfuric acid was conducted in a fixed bed reactor to prepare levoglucosenone (LGO), a very important anhydrosugar for organic synthesis. The liquid yield and LGO yield were studied at temperatures from 240 to 350°C and sulfuric acid loadings from 0.92 to 7.10wt.%. An optimal ...
Boonmanumsin P - - 2011
Microwave-assisted ammonium hydroxide (NH(4)OH) followed by phosphoric acid (H(3)PO(4)) treatments were used to release monomeric sugars from Miscanthus sinensis grown in Cha-Chueng-Sao province, Thailand. Treatment with 1.0% (w/v) NH(4)OH, 15:1 liquid-to-solid ratio (LSR) at 120°C temperature for 15min liberated 2.9g of monomeric sugars per 100g of dried biomass, whereas the ...
Moshaii A - - 2011
Using a hydrochemical simulation, temperature dependency of single-bubble sonoluminescence (SL) in a concentrated solution of sulfuric acid has theoretically been studied. With calculating the phase diagrams of an SL bubble in the solution of 85% acid, maximum acquirable SL emissions at different ambient temperatures were calculated. The results show that ...
Khosravanifard Behnam - - 2011
The aim of this study was to evaluate the effect of adding acidulated phosphate fluoride (APF) to phosphoric acid etchant on shear bond strength (SBS) and adhesive remnant index (ARI) of orthodontic brackets bonded to etched teeth. In this in vitro experimental study, 40 human premolars were etched with 37% ...
Gorokhovik Ioulia - - 2011
Ketoanilides containing alkyl side chains were readily cyclized to 3-hydroxy-2-oxindoles or spirooxindoles by a single or double intramolecular Friedel-Crafts reaction in the presence of trifluoroacetic acid (TFA) at room temperature or at 45 °C. α-Iminocarboxamides, generated in situ from ketoamides, cyclized similarly to 3-aminooxindoles under identical conditions.
Inoue Satoki - - 2011
PURPOSE: Previous studies have demonstrated that amino acid infusions exert enhanced thermogenic effects during general anesthesia. This study was conducted to investigate whether amino acid infusions started after development of intraoperative core hypothermia can accelerate rewarming. METHODS: Twenty-two patients scheduled for major abdominal surgery were included in this study. When ...
Mercanti D J - - 2012
Temperate bacteriophages ф iLp84 and ф iLp1308, previously isolated from mitomycin C-induction of Lactobacillus paracasei strains 84 and CNRZ1308, respectively, were tested for their resistance to several physical and chemical treatments applied in dairy industry. Long-term survival at 4 °C, -20 °C and -80 °C, resistance to either thermal treatments of 63 °C, 72 °C and 90 °C, ...
Arai Koichiro - - 2011
Novel 2'-O-modified oligoribonucleotides with alkoxymethyl skeletons were synthesized, and their ability to hybridize complementary nucleic acids and their nuclease resistance were analyzed. The hybridization ability was improved by introducing electron-withdrawing groups and the increases in melting temperature (T(m) value) was particularly high for chlorine-substituted compounds. Nuclease resistance of these 2'-O-alkoxymethylated ...
Diedericks Danie - - 2011
Various ionic liquids have been identified as effective pretreatment solvents that can enhance the cellulose digestibility of lignocellulose by removing lignin, one of the main factors contributing to the recalcitrant nature of lignocellulose. 1-Butyl-3-methylimidazolium methylsulfate ([BMiM]MeSO(4) ) is a potential delignification reagent, hence its application as a pretreatment solvent for ...
Buettner Karin - - 2011
The thermostability of microbial transglutaminase (MTG) of Streptomyces mobaraensis was further improved by saturation mutagenesis and DNA-shuffling. High-throughput screening was used to identify clones with increased thermostability at 55°C. Saturation mutagenesis was performed at seven "hot spots", previously evolved by random mutagenesis. Mutations at four positions (2, 23, 269, and ...
Witko Ewelina M - - 2011
The room temperature and cryogenic terahertz (THz) spectra (10-95 cm(-1)) of l-tartaric acid and dl-tartaric acid were investigated. At 293 K, the l-tartaric acid spectrum showed four absorption features at 36.4, 61.6, 78.7, and 87.3 cm(-1) in the experimental spectrum. Once cooled to 78 K, these features narrowed and shifted ...
Ray Devalina - - 2011
A convenient, mild and environment-friendly dehydration reaction of fructose in ionic liquid using phosphorous pentoxide (P(2)O(5)) has been investigated. The acidic nature of P(2)O(5) along with its hygroscopic properties has been successfully utilized to afford 81.2% yield of 5-hydroxymethylfurfural (5-HMF) at 50°C in 60mins. Phosphoric acid yielded remarkably less 5-HMF ...
Park Jihyun - - 2011
Paprika (Capsicum annuum L.) is widely used as a healthy vegetable having antitumor-promoting activity and reducing or preventing chronic disease. Paprika has been mostly consumed as fresh fruit, and as food colorants such as oleoresin or pigment powder. In this study, pickled paprika was produced and its quality characteristics were ...
Inouchi Toshifumi - - 2011
T-shaped π-conjugated molecules with an N-methyl-benzimidazole junction have been synthesized and their acid-responsive photophysical properties owing to the change in the π-conjugation system are discussed. T-shaped π-conjugated molecules consist of two orthogonal π-conjugated systems including a phenyl thiophene extended from the 2-position and alkyl phenylenes connected through various π-spacers from ...
1 2 3 4 5 6 7 8 9 10 >