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Yaoyao Shao, Yan Zhao, Mingsheng Xu, Zhangyi Chen, Shuzhen Wang, Yonggang Tu
This study investigated the effects of copper ions on egg white (EW) gel induced by strong alkali. Changes in gel characteristics were examined through texture profile analysis, scanning electron microscopy (SEM), and chemical methods. The value of gel strength reached its maximum when 0.1% copper ions was added. However, the lowest cohesiveness values were observed at 0.1%. The springiness of gel without copper ions was significantly greater than the gel with copper ions added. SEM results illustrated that the low concentration of copper ions contributes to a dense and uniform gel network, and an open matrix was formed at 0...
September 1, 2017: Poultry Science
Xue-Dan Hou, Ao-Lin Li, Kai-Peng Lin, Yuan-Yuan Wang, Zhi-Yin Kuang, Shi-Lin Cao
Rice straw pretreatment mediated by choline chloride (ChCl) or lactic acid (Lac) sequences deep eutectic solvents (DESs) was investigated in this work. Hydrogen bond acceptors (HBAs) and hydrogen bond donors (HBDs) proved to be both important for DESs pretreatment efficiency. DESs containing lots of hydroxyl or amino groups with a high intermolecular hydrogen-bond (H-bond) strength exhibited weak biomass deconstruction abilities. The presence of strong electron-withdrawing groups in DESs was benefit for xylan removal, thus furnishing higher cellulose digestibility...
October 7, 2017: Bioresource Technology
Rahul Purbia, Santanu Paria
The noble metal nanocatalysts on high surface area magnetic material supports have huge technological importance in the field of catalysis. The green synthesis of magnetic-noble metal hybrid material has another technological importance. In this study, we report a novel, efficient, and sustainable synthesis methodology for Au nanoparticles (NPs) deposited hierarchical magnetic maghemite (γ-Fe2O3) tubes. In this methodology, the green tea extract was used as a reducing agent for both iron oxide and Au NPs synthesis...
October 7, 2017: Journal of Colloid and Interface Science
Carolina Santos Mello, Mirian Silva do Carmo Rodrigues, Humberto Bezerra de Araújo Filho, Lígia Cristina Fonseca Lahoz Melli, Soraia Tahan, Antônio Carlos Campos Pignatari, Mauro Batista Morais
OBJECTIVE: To analyze the fecal microbiota composition of children living in an urban slum in Brazil, with or without small intestinal bacterial overgrowth, and to investigate the occurrence of stunting and anemia. METHODS: A total of 100 children were studied, aged 5-11 years, from the municipality of Osasco, São Paulo. Small intestinal bacterial overgrowth was screened through hydrogen and methane breath test with lactulose. Weight and height were measured, and the height-for-age and body mass-for-age anthropometric indexes were calculated...
October 16, 2017: Jornal de Pediatria
Elijah G Schnitzler, Nathan A Seifert, Ignes Kusuma, Wolfgang Jaeger
The structure and internal dynamics of p-toluic acid and its 1:1 complex with water were investigated in the gas phase using chirped-pulse and cavity-based Fourier transform microwave spectroscopy. One conformer and one isomer were identified for the monomer and monohydrate, respectively. In the monohydrate, water acts as both a hydrogen bond donor and acceptor, participating in a six-membered intermolecular ring with the carboxyl group. Both a- and b-type transitions were observed for the monomer; only a-type transitions were observed for the monohydrate...
October 19, 2017: Journal of Physical Chemistry. A
Eamonn Reading, Zoe Hall, Chloe Martens, Tabasom Haghighi, Heather Findlay, Zainab Ahdash, Argyris Politis, Paula J Booth
Membrane protein-lipid interplay is important for cellular function, however, tools enabling the interrogation of protein dynamics within native lipid environments are scarce and often invasive. We establish that the styrene-maleic acid anhydride lipid particle (SMALP) technology can be coupled with hydrogen-deuterium exchange mass spectrometry (HDX-MS) to investigate membrane protein conformational dynamics within native lipid bilayers. We demonstrate changes in accessibility and dynamics of the rhomboid protease, GlpG, captured within three different native lipid compositions, and identify protein regions sensitive to changes in the native lipid environment...
October 19, 2017: Angewandte Chemie
Roberto Orellana, Gina Chaput, Lye Meng Markillie, Hugh Mitchell, Matt Gaffrey, Galya Orr, Kristen M DeAngelis
The production of lignocellulosic-derived biofuels is a highly promising source of alternative energy, but it has been constrained by the lack of a microbial platform capable to efficiently degrade this recalcitrant material and cope with by-products that can be toxic to cells. Species that naturally grow in environments where carbon is mainly available as lignin are promising for finding new ways of removing the lignin that protects cellulose for improved conversion of lignin to fuel precursors. Enterobacter lignolyticus SCF1 is a facultative anaerobic Gammaproteobacteria isolated from tropical rain forest soil collected in El Yunque forest, Puerto Rico under anoxic growth conditions with lignin as sole carbon source...
2017: PloS One
Lin Wang, Yinglin Cui, Jianwei Zhang, Qinsheng Zhang
RATIONALE: Urinary lithiasis is one of severe postoperative complications in patients undergoing renal transplantation, possibly leading to anuria, urinary infection, or even acute renal failure. Potassium sodium hydrogen citrate (PSHC), a potassium-bearing citrate, is commonly prescribed to prevent stone formation. PATIENT CONCERNS: A 25-year-old man (patient 1) and a 31-year-old man (patient 2) receiving renal transplantation for end-stage renal disease (ESRD) were enrolled in this study...
October 2017: Medicine (Baltimore)
C M Marianno, M R Smith, K M Cook
This paper will examine deposition patterns of four radionuclides following the Fukushima-Daiichi accident. For nearly 13 d following the event, fission products were released into the environment through planned venting procedures and hydrogen explosions. To assist the government of Japan (GOJ) in the assessment of the releases, the National Nuclear Security Administration's Consequence Management Response Team (CMRT) deployed and took nearly 3 mo of measurements using airborne radiation sensors, fixed monitors, high purity germanium (HPGe) detectors, and health physics survey equipment...
October 18, 2017: Health Physics
Jinghua Liang, Huijun Liu, Dengdong Fan, Peiheng Jiang
Defects such as vacancies and impurities could have profound effects on the transport properties of thermoelectric materials. However, it is usually quite difficult to directly calculate the thermoelectric properties of defect-containing systems via first-principles methods since a very large supercell is required. In this work, based on the linear response theory and the kernel polynomial method, we present an efficient approach that can help to calculate the thermoelectric transport coefficients of a large system containing millions of atoms at arbitrary chemical potential and temperature...
October 19, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Matthieu David, Damien Connétable
While diffusion mechanisms of interstitial elements in fcc systems are generally well-known, especially in the case of H atoms, we show in this work that even in the case of a simple metallic system (aluminum), the diffusion of interstitials exhibits a wide variety of paths and mechanisms that depend on the specie. We used an approach based on first-principles calculations associated with kinetic Monte-Carlo simulations and a multi-state diffusion formalism to compute the diffusion coefficients of five interstitial elements: hydrogen, boron, carbon, nitrogen and oxygen...
October 19, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
D Meshach Paul, Tania Chadah, B Senthilkumar, Rao Sethumadhavan, R Rajasekaran
The major candidate for multiple sulfatase deficiency is defective formylglycine-generating enzyme (FGE). Though adequately produced, mutations in FGE stall the activation of sulfatases and prevent their activity. Missense mutations viz., E130D, S155P, A177P, W179S, C218Y, R224W, N259I, P266L, A279V, C336R, R345C, A348P, R349Q and R349W associated with multiple sulfatase deficiency are yet to be computationally studied. Aforementioned mutants were initially screened through ws-SNPs&GO(3D) program. Mutant R345C acquired the highest score and hence was studied in detail...
October 19, 2017: Journal of Biomolecular Structure & Dynamics
Fangfang Yan, Xinguo Liu, Shaolong Zhang, Jing Su, Qinggang Zhang, Jianzhong Chen
Endocellular protein tyrosine phosphatase 1B (PTP1B) is one of the most promising target for designing and developing drugs to cure type-II diabetes and obesity. Molecular dynamics (MD) simulations combined with molecular mechanics generalized Born surface area (MM-GBSA) and solvated interaction energy (SIE) methods were applied to study binding differences of three inhibitors (ID: 901, 941 and 968) to PTP1B, the calculated results show that the inhibitor 901 has the strongest binding ability to PTP1B among the current inhibitors...
October 19, 2017: Journal of Biomolecular Structure & Dynamics
Evgeny M Buev, Vladimir S Moshkin, Vyacheslav Y Sosnovskikh
Active methylene compounds react with in situ generated nonstabilized azomethine ylides via domino Mannich reaction-dipolar cycloaddition to form 3,3-disubstituted pyrrolidines, including oxindole alkaloids. When starting material possesses a single activated hydrogen the reaction terminates at the Mannich base stage. The developed methodology was applied in short and efficient synthesis of (±)-horsfiline and N-protected (±)-coerulescine.
October 19, 2017: Journal of Organic Chemistry
Jay Charles Amicangelo, Yuan-Pern Lee
The reaction of chlorine atoms (Cl) with isoprene (2-methyl-1,3-butadiene, C5H8) in solid para-hydrogen (p-H2) matrices at 3.2 K has been studied using infrared (IR) spectroscopy. Mixtures of C5H8 and Cl2 were co-deposited in p-H2 at 3.2 K, followed by irradiation with ultraviolet light at 365 nm to induce the photodissociation of Cl2 and the subsequent reaction of the Cl atoms with C5H8. Upon 365-nm photolysis, a multitude of new lines appeared in the IR spectrum and, based on the secondary photolysis behavior, it was determined that the majority of the new lines belong to two distinct chemical species, designated as set A (intense lines at 1237...
October 19, 2017: Journal of Physical Chemistry. A
Xuhui Lin, Huaiyu Zhang, Xiaoyu Jiang, Wei Wu, Yirong Mo
The concept of resonance-assisted hydrogen bond (RAHB) has been widely accepted, and its impact on structures and energetics can be best studied computationally using the block-localized wavefunction (BLW) method which is a variant of ab initio valence bond (VB) theory and able to derive strictly electron-localized structures self-consistently. In this work, we use the BLW method to examine a few molecules which result from the merging of two malonaldehyde molecules. As each of these molecules contains two hydrogen bonds, these intramolecular hydrogen bonds may be cooperative or anticooperative, depended on their relative orientations and compared with the hydrogen bond in malonaldehyde...
October 19, 2017: Journal of Physical Chemistry. A
Petra Kralova, Michal Malon, Miroslav Soural
Herein, we report a fully stereoselective synthesis of tetrahydro-6H-benzo[e][1,4]oxazino[4,3-a][1,4]diazepine-6,12(11H)-diones from polymer-supported Fmoc-Ser(tBu)-OH. After the simple solid-phase synthesis of N-alkylated-N-acylated intermediates using various 2-nitrobenzoic acids and bromoketones, the key intermediates were obtained via trifluoroacetic acid (TFA)-mediated cleavage from the resin in the presence of triethylsilane (TES), which led to stereoselective reduction and yielded a specific configuration of the newly formed C3 chiral center...
October 19, 2017: ACS Combinatorial Science
Ping Chen, Xiaolong Fu, Peng Hu, Chengjian Xiao, Xingbi Ren, Xiulong Xia, Heyi Wang
The conventional packed column gas chromatographic analysis of hydrogen isotopes has low column efficiency, broad peak and long retention time. In this work, a γ-Al2O3 with MnCl2 coated capillary packed column was tested at cryogenic temperature. The systematic column efficiency analysis and the hydrogen isotopes analytical technique research had been carried out. The results showed that, the γ-Al2O3 with MnCl2 coating could greatly improve the surface degree of order, pore structure and adsorption properties...
July 8, 2017: Se Pu, Chinese Journal of Chromatography
Peng Hu, Ping Chen, Dawei Cao, Xiaolong Fu, Chengjian Xiao, Heyi Wang
CPL-1 is a metal organic framework (MOF) with potential application as stationary phase material in gas chromatographic (GC) analysis, due to its large specific surface area, uniform pore size and good quantum sieving effect on hydrogen isotopes at low temperatures. Herein, a microporous column packed with CPL-1 was used at cryogenic temperature (77 K), and the column was 1.0 mm in inner diameter, 0.5 m in length. Single crystals of Al2O3 was used to build flow path for chromatographic carrier gas. The results showed that the adsorption of H2 and D2 with CPL-1 was 4 mmol/g at 77 K, which was better than MnCl2/γ -Al2O3 and γ -Al2O3...
October 8, 2017: Se Pu, Chinese Journal of Chromatography
Xiaomin Xu, Jingshun Zhang, Zengxuan Cai, Jing Zhang, Baifen Huang, Jiaojiao Xu, Qing Chen
A fast and wide linear range method was established for the determination of mushroom toxins amanitins (α-amanitin,β-amanitin and γ-amanitin) and phallotoxins (phallacidin and phalloidin) in wild mushrooms by online liquid chromatography-diode array detector-tandem mass spectrometry (LC-DAD-MS/MS). The mushroom toxins were extracted with methanol, and diluted with water. The extracts were separated on an XBridge(TM) BEH C18 column (150 mm×3.0 mm, 2.5 μm) under pH 10.7, measured by DAD and then analyzed by MS/MS...
June 8, 2017: Se Pu, Chinese Journal of Chromatography
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