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Hu Liang L Department of Chemistry, University of Alberta, Edmonton, AB, T6G 2G2 - - 2013
We present the hysteresis of the response of the poly(N-isopropylacrylamide)-co-acrylic acid microgel-based etalons to solution temperature and pH changes. We find that the optical hysteresis of the etalon can be controlled using various solution ionic strengths and/or counterions, as well as by varying the microgel's acrylic acid concentration.
Xia Ao - - 2013
The thermodynamic comparison in dark fermentation between amino acids and reducing sugars released from Nannochloropsis oceanica biomass are investigated for the first time. The total utilisation efficiencies of amino acids and reducing sugars are both about 95% in dark fermentation. But the consumption time of most amino acids is about ...
Chatterjee Abhishek - - 2013
Selected: A tryptophanyl-tRNA synthetase(TrpRS)/tRNA pair was evolved to genetically encode tryptophan analogues and other unnatural amino acids with large side chains in E. coli. A selection scheme was employed to identify TrpRS variants able to selectively charge tRNACUA (Trp) with Trp analogues. Substitution of Trp66 in enhanced cyan fluorescent protein ...
Emami Razavi Amirnader - - 2013
Aim: High-density lipoprotein (HDL) particles are heterogeneous in their composition, structure and size and may differ in conferring protection against coronary artery disease. The aim of this study is to investigate the associations between HDL size and its fatty acid composition. Patients & methods: HDL mean particle size from 140 ...
Siebels Amanda M - - 2013
The Madison Metropolitan Sewerage District (The District) in Madison, Wisconsin has been experiencing seasonal foaming in their anaerobic biosolids digesters, which has occurred from mid-November to late June for the past few years. The exact cause(s) of foaming is unknown. Previous research findings are unclear as to whether applications of ...
Desai Vilas - - 2013
Silver based antimicrobial agents with TiO2 as a host support (AgCl/TiO2) are increasingly being evaluated for disinfection and therapeutic applications. In this work TiO2 supported silver chloride nanocomposites were synthesized and functionalized with fumaric acid. X-ray diffraction results showed that the TiO2 was in anatase phase and AgCI was in ...
Chen Bin - - 2013
To establish a ultra-pressure liquid chromatography (UPLC) method for the determination of 5 phenolic acids including neochlorogenic acid, chlorogenic acid, caffeic acid, cryptochlorogenic acid, and cynarin in fried Fructus xanthii from different production sites and its dispensing granule. An Acquity BEH C18 chromatographic column (100 mm × 2.1 mm,1.7 μm) ...
Tong Xuejiao - - 2013
The removal efficiency of copper (Cu(II)) from an actual acidic electroplating effluent by biochars generated from canola, rice, soybean and peanut straws was investigated. The biochars simultaneously removed Cu(II) from the effluent, mainly through the mechanisms of adsorption and precipitation, and neutralized its acidity. The removal efficiency of Cu(II) by ...
Li Shigui - - 2013
After biocontrol Trichoderma longbrachiatum T2 was applied in the rhizosphere of cucumber, the functional diversity of the rhizomicrobes utilizing carbon sources was investigated by using Biolog Eco-microplates technique. The result showed that T longbrachiatum T2 had a significant effect on the rhizomicrobes in terms of their metabolic activity and their ...
Wang Manli M Department of Pharmaceutical Sciences, Shenyang Pharmaceutical University, 103 Wenhua Road, Shenyang, Liaoning 110016, People's Republic of - - 2013
To develop effective and safe penetration enhancers, a series of l-carvyl esters, namely, 5-isopropenyl-2-methylcyclohex-2-en-1-yl heptanoate (C-HEP), 5-isopropenyl-2- methylcyclohex-2-en-1-yl octanoate (C-OCT), 5-isopropenyl-2-methylcyclohex-2-en-1-yl decanoate (C-DEC), 5-isopropenyl-2-methylcyclohex-2-en-1-yl dodecanoate (C-DOD), 5-isopropenyl-2-methylcyclohex-2-en-1-yl tetradecanoate (C-TET), and 5-isopropenyl-2-methylcyclohex-2-en-1-yl palmitate (C-PAL), was synthesized from l-carveol and saturated fatty acids (C7-C16). The volatility of l-carveol and l-carvyl esters was ...
Zhang Ning - - 2013
BACKGROUND: Shiitake, the second cultivated mushroom, is famous for its high nutritional value and medicinal properties. In this study, some of the chemical parameters and antioxidant properties of caps and stipes of shiitake dried by different methods (freeze drying, shade drying and hot air drying) were comparatively investigated with spectrophtotometric ...
West Megan E - - 2013
The color and chemical stabilities of six anthocyanins, including cyanidin 3-glucoside, highly purified and present in semi-purified extracts (also containing other anthocyanins) from grape pomace, purple corn, and black rice, were determined in combination with ascorbic acid in solutions at differing pH (3.0 and 4.0) and temperatures (6 to 40 ...
Hu Ting - - 2013
Guluronic acid oligosaccharides (GOS) with degree of polymerization (DP) ranging from 1 to 10 were prepared by a rapid microwave degradation method. Polyguluronic acid, fractionated from alginate hydrolysate, was dissolved in dilute ammonia water at a concentration of 20mg/mL (pH 5) and then hydrolyzed under microwave irradiation (1600W) at 130°C ...
Nodake Kazumasa - - 2013
The purpose of this study was to assess an evaluation method using an artificial taste sensor, in comparison with chemical analysis and sensory evaluation of the taste of meat during curing. Samples of Canadian pork were treated with salt, nitrite and phosphate. Curing time ranged from 0 to 168 h. In ...
Godovikova Tatyana Sergeevna - - 2013
Herein, we report a novel strategy to engineer an acid-sensitive anticancer theranostic agent using a vector-drug ensemble. The ensemble was synthesized by directly conjugating the linoleic acid (LA)-modified branched polyethyleneimine with a chemotherapeutic drug trifluorothymidine. Linoleic acid residues were grafted onto 25 kDa polyethyleneimine (PEI) by treating PEI with linoleic ...
Behera Sailesh N - - 2013
Aerosol acidity is one of the most important parameters that can influence atmospheric visibility, climate change and human health. Based on continuous field measurements of inorganic aerosol species and their thermodynamic modeling on a time resolution of 1h, this study has investigated the acidic properties of PM2.5 and their relation ...
Golshan Tafti Abolfazl - - 2013
In present study, spray-dried sourdough was produced using a pilot scale spray dryer and the physico-chemical and microbial characteristics of the obtained sourdough powder were investigated. The application of the spray-dried sourdough at different levels (3%, 6%, 9% and 15%) in breadmaking was also evaluated. Bulk density, wettability and suspensibility ...
Tanino Takanori - - 2013
The coproduction of a useful material and electricity via a novel application of microbial fuel cell (MFC) technology to oxidative fermentation was investigated. We focused on vinegar production, i.e., acetic acid fermentation, as an initial and model useful material that can be produced by oxidative fermentation in combination with MFC ...
Wu Zhisheng - - 2013
Six cyclic thiourea/urea functionalized triphenylamine-based dyes (AZ1-AZ6) containing 2-cyanoacrylic acid as an acceptor and various linkers (phenyl, biphenyl, and bithiophene) were synthesized. They exhibited high photovoltaic performance owing to an improved short-circuit photocurrent density (Jsc) and open-circuit voltage (Voc). Among them, AZ6 bearing a cyclic thiourea group and bithiophene linker ...
Bornik Maria-Anna - - 2013
Thermal treatment of aqueous solution of D-galacturonic acid at pH 3, 5 and 8 led to rapid browning of the solution and to the formation of carbocyclic compounds like reductic acid (2,3-dihydroxy-2-cyclopenten-1-one), DHCP (4,5-dihydroxy-2-cyclopenten-1-one) and furan-2-carbaldehyde as degradation products in weak acidic solution. Studies on their formation revealed 2-ketoglutaraldehyde as ...
Cheng Jing-Sheng - - 2013
Pitching ratio has been reported to impact not only on the primary metabolism, but also the secondary metabolism. Comparative metabolomics was used to explore the metabolic responses of Streptomyces lydicus E9 to pitching ratios (1, 10, and 30 %, v/v). We identified more than 120 metabolites involved in glycolysis, tricarboxylic acid ...
Roberts John A S - - 2013
Open circuit potentials were measured for acetonitrile solutions of a variety of acids and their conjugate bases under 1 atm H2. Acids examined were triethylammonium, dimethylformamidium, 2,6-dichloroanilinium, 4-cyanoanilinium, 4-bromoanilinium, and 4-anisidinium salts. These potentials, along with the pKa values of the acids, establish the value of the standard hydrogen electrode ...
Slade Jonathan H - - 2013
The reactive uptake coefficients (γ) of OH by levoglucosan, abietic acid, and nitroguaiacol serving as surrogate compounds for biomass burning aerosol have been determined employing a chemical ionisation mass spectrometer coupled to a rotating-wall flow-tube reactor over a wide range of [OH] ∼10(7)-10(11) molecule cm(-3). Volatilisation products of these organic ...
Nozue Tsuyoshi - - 2013
A low n-3 to n-6 polyunsaturated fatty acid (PUFA) ratio is associated with cardiovascular events. However, the effects of this ratio on coronary atherosclerosis have not been fully examined, particularly in patients treated with different types of statins. This study compared the effects of n-3 to n-6 PUFA ratios on ...
Camerino Michelle A - - 2013
An efficient synthesis of the enantiomers of fluorenylethylchloroformate (FLEC) has been achieved that allows the routine application of the reagent for the resolution of chiral amines including unusual amino acids. The utility of the fluorenylethoxycarbonyl (Feoc) group as a chiral Fmoc equivalent, for combined resolution and protection of amino acids, ...
Sun Qianping - - 2013
Ordered mesoporous γ-alumina (OMA), Ce-doped, Zr-doped and Ce-Zr-codoped OMA samples were synthesized in a sol-gel system with P123 as the soft template, both salicylic acid and citric acid as the assistant templates. The results show that the incorporations of either cerium or zirconium or both are able to improve the ...
Cao Hai - - 2013
Twisted ribbons were formed by the self-assembly of racemic alanine derivatives (middle picture), whereas only flat nanostructures were obtained from the individual enantiomers (left). The twist was sensitive to a slight enantiomeric excess and showed remarkable macroscopic chirality. Moreover, it could discriminate various amino acid derivatives (right) and even enabled ...
Bhoite Roopali N - - 2013
Gallic acid (3,4,5-trihydroxybenzoic acid) was produced by microbial biotransformation of coffee pulp tannins by Penicillium verrucosum. Gallic acid production was optimized using response surface methodology (RSM) based on central composite rotatable design. Process parameters such as pH, moisture, and fermentation period were considered for optimization. Among the various fungi isolated ...
Crisalli Pete P Department of Chemistry, Stanford University, Stanford, California 94305-5080, United - - 2013
Anthranilic acids were recently reported as superior catalysts for hydrazone and oxime formation compared to aniline, the classic catalyst for these reactions. Here, alternative proton donors were examined with varied pKa in an effort to enhance activity at biological pH. The experiments show that 2-aminobenzenephosphonic acids are superior to anthranilic ...
Ahmed Sibtain - - 2013
Detailed kinetic and thermodynamic parameters for lysine production from Brevibacterium lactofermentum are investigated for the first time in this study. Production of the essential amino acid, L-lysine, by B. lactofermentum was assessed in a flask and a continuously stirred tank fermentor (22 L). Maximum lysine production was achieved after 40 h of ...
Mukai Yuri - - 2013
The glycosylphosphatidylinositol (GPI) attachment is a most important post-translational modification of proteins that plays essential roles in promoting the biochemical activities of eukaryotic cells. Described here is an analysis of the amino acid properties of mammalian GPI-anchored proteins (GPI-APs) and the development of an innovative method of detecting them. GPI-APs ...
Gao Haiyan - - 2013
Intergrown Li2FeSiO4·LiFePO4-C nanocomposites with different compositions were synthesized by a tartaric acid assisted sol-gel method. The 0.96Li2FeSiO4·0.04LiFePO4-C nanocomposites exhibited greatly enhanced electrochemical properties, attaining a high discharge capacity up to 284.7 mA h g-1 (equal to ca. 1.72 Li+ per molecule) at 45 °C.
Yin Jie - - 2013
Reduction of the hypervalent heme pigment ferrylmyoglobin by green tea catechins in aqueous solution of pH = 7.5 was investigated by stopped-flow spectroscopy. Reduction by the gallic acid esters epigallocatechin gallate (EGCG, k2 = 1460 L mol-1 s-1, 25.0 °C, 0.16 ionic strength) and epicatechin gallate (ECG, 1410 L mol-1 ...
Chen Zhaohui - - 2013
We reported a new application of silver nanoparticles (NPs) for the visual sensing of aromatic polyphenols, such as gallic acid, pyrogallol and tannic acid, which is based on the intensified plasmon absorbance signals and visual changes from yellow to orange due to hydrogen-bonding recognition and subsequent catalytic oxidation of the ...
Vahl Katja - - 2013
A FIA system using a pH-sensitive detector based on a graphite/quinhydrone/silicone composite electrode was applied to determine sequentially the titratable acidity and the pH of wine, as well as the sum of calcium and magnesium ions. For all measurements the same FIA configuration was used employing different carrier solutions. The ...
Gardette Jean-Luc - - 2013
The oil extracted from the bean of Balanites aegyptiaca was characterized, and its photochemical and thermal stabilization were evaluated. The chemical composition was determined using gas chromatography (GC), revealing that the oil is very rich in unsaturated fatty acids (72% Omega-6 and Omega-9). The photochemical stability was assessed by subjecting ...
Selvan B Karpanai - - 2013
Carbon (neutral) based renewable liquid biofuels are alternative to petroleum derived transport fuels that contribute to global warming and are of a limited availability. Microalgae based biofuels are considered as promising source of energy. Lyngbya sp. and Synechococcus sp. were studied for the possibility of biodiesel production in different media ...
Wen Zhang Z Department of Chemistry, Georgia State University, Atlanta, Georgia 30303, - - 2013
The selenium derivatization of nucleic acids and nucleic acid-protein complexes has provided a powerful tool to solve phase problem in X-ray crystallography. Selenium atoms in the nucleotides can serve as fine scattering centers in crystal diffraction. Towards the synthesis of multiple selenium atom-containing nucleotides, which offers strong phasing power to ...
Singh Suman - - 2013
Thioglycolic acid capped cadmium sulfide (CdS/T) quantum dots have been synthesized using wet chemistry and their optical behavior has been investigated using UV-visible absorption and fluorescence spectroscopy. The role of the capping agent, sulfide source concentration, pH and temperature has been studied and discussed. Studies showed that alkaline pH leads ...
Melling Meaghan A - - 2013
Background: Retinoic acid signaling is essential for many aspects of early development in vertebrates. To control the levels of signaling, several retinoic acid target genes have been identified that act to suppress retinoic acid signaling in a negative feedback loop. The nuclear protein Ski has been extensively studied for its ...
Kul Dilek - - 2013
A new type of modified electrode sensor for ascorbic acid has been prepared by deposition of multi-walled carbon nanotubes (MWCNT) and poly(Nile blue A) on the surface of glassy carbon electrodes. Nile blue A was electropolymerised either beneath (directly on glassy carbon) or onto the MWCNT layer by potential cycling ...
Yun Yeo-Myeong - - 2013
In this study, individual pretreatments (acid and ultrasonic) and a combination of these pretreatments were optimized to enhance the efficiency of dark fermentative hydrogen production (DFHP) from microalgal biomass. The experimental results show that the maximum H2 production performance of 42.1mL H2/g dry cell weight (dcw) was predicted at 0.79% ...
Izumi Yudai - - 2013
Circular dichroism (CD) spectroscopy in the soft x-ray energy region is a new tool to study the local structure of chiral materials. In this paper, we introduce a method to measure high-quality CD spectra in the oxygen K-edge energy region. Characteristic CD spectra of thin films of the amino acids ...
Chen Hsiao-Chien - - 2013
To break through the long time and complex procedures for the preparation of highly conjugated reduced graphene oxide (r-GO) in developing electrochemical sensor, a time-saving and simple method is investigated in this study. One novel step of the exfoliated accompanying carboxylated graphene sheet from pristine is achieved via Friedel-Crafts acylation. ...
Peluso Ilaria - - 2013
BACKGROUND AND AIM: A complex relationship between immune system and metabolic pathway exists and can induce oxidative stress. The objective of this study was to design a new methodology allowing the measurement of oxidative status of leukocytes. METHODS AND RESULTS: We developed a flow cytometry technique, based on C11-BODIPY 581/591 ...
Stefanov Ivan Valentinov - - 2013
Determination of nutritionally important trans MUFA, CLA and OBCFA milk fatty acids (often present in amounts lower than 1.0 g/100g of total fat) using fast and non-destructive analytical methods would enhance their use as diagnostic tools in dairy herd and human health management. Here, PLS regression using ATR/FTIR spectra indicated ...
Chukir Tariq - - 2013
The long-chain 18-carbon fatty acids linoleic, oleic, and stearic acids, retronasally in vapor phase, are discriminated from blanks and each other. However, ability to linguistically identify them was unknown. To explore this, a Focus Group and then Check-All-That-Apply measures gave 9 identifiers for the 3 fatty acids plus phenylethyl alcohol ...
Li Xiao-Ling - - 2013
Different concentrations of a sodium chloride spray were applied to the grapevine cultivar Kyoho to determine the effects of salinity on berry quality. The fruit's fresh weight, relative water content, hardness and titratable acid were gradually enhanced with increased salt concentrations. Anthocyanin and soluble solids increased after treatment with moderate ...
Boros Eszter E The Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, 149 Thirteenth Street, Suite 2301, Charlestown, Massachusetts 02129, United - - 2013
The Gd(III) complex of DO3A-N-α-aminopropionate, Gd(DOTAla), was used to generate a small library of putative MRI probes targeted to human serum albumin (HSA). Ten compounds were synthesized via multistep organic synthesis, and the corresponding Gd complexes were investigated for their affinity to HSA, lipophilicity, and relaxivity in the absence and ...
Wang Hualei - - 2013
ABSTRACT: BACKGROUND: A nitrilase-mediated pathway has significant advantages in the production of optically pure (R)-(-)-mandelic acid. However, unwanted byproduct, low enantioselectivity, and specific activity reduce its value in practical applications. An ideal nitrilase that can efficiently hydrolyze mandelonitrile to optically pure (R)-(-)-mandelic acid without the unwanted byproduct is needed. RESULTS: ...
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