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Dasheng Lu et al.
Chemosphere, 114, 327-336 (2014-08-13)
A novel method was developed for the analysis of organochlorine pesticides (OCPs), polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) in human hair samples. External contaminants of hair were extracted with acetone under sonication, while washed hair was further hydrolyzed
Noreen Yaqoob et al.
Toxicology, 323, 70-77 (2014-06-14)
Trichloroethylene (TCE) is widely used as a cleaning and decreasing agent and has been shown to cause liver tumours in rodents and a small incidence of renal tubule tumours in male rats. The basis for the renal tubule injury is
Hong-Wei Dong et al.
Biotechnology and bioengineering, 110(9), 2395-2404 (2013-03-12)
Toxic compounds, such as formic acid, furfural, and hydroxymethylfurfural (HMF) generated during pretreatment of corn stover (CS) at high temperature and low pH, inhibit growth of Zymomonas mobilis and lower the conversion efficiency of CS to biofuel and other products.
Manoj Nimbalkar et al.
Journal of magnetic resonance (San Diego, Calif. : 1997), 228, 16-31 (2013-01-22)
We present highly robust, optimal control-based shaped pulses designed to replace all 90° and 180° hard pulses in a given pulse sequence for improved performance. Special attention was devoted to ensuring that the pulses can be simply substituted in a
Ji Ye Lee et al.
Bioresource technology, 132, 84-90 (2013-02-12)
The objective of this work was to investigate the feasibility of acid-catalyzed hydrothermal fractionation for maximum solubilization of the hemicellulosic portion of three agricultural residues. The fractionation conditions converted into combined severity factor (CS) in the range of 1.2-2.9. The
Xinzheng Yang
Dalton transactions (Cambridge, England : 2003), 42(33), 11987-11991 (2013-07-13)
Density functional theory calculations reveal a complete reaction mechanism with detailed energy profiles and transition state structures for the dehydrogenation of formic acid catalyzed by an iron complex, [P(CH2CH2PPh2)3FeH](+). In the cationic reaction pathway, a β-hydride elimination process is confirmed
Jessica Momb et al.
Proceedings of the National Academy of Sciences of the United States of America, 110(2), 549-554 (2012-12-26)
Maternal supplementation with folic acid is known to reduce the incidence of neural tube defects (NTDs) by as much as 70%. Despite the strong clinical link between folate and NTDs, the biochemical mechanisms through which folic acid acts during neural
Jésus Raya et al.
Journal of magnetic resonance (San Diego, Calif. : 1997), 227, 93-102 (2013-01-15)
A simple multiple-contact cross-polarization (CP) scheme is applied to a powder sample of ferrocene and β-calcium formate under static and magic-angle spinning (MAS) conditions. The method is described analytically through the density matrix formalism. We show that multiple equilibrations-re-equilibrations with
Jo Philips et al.
Journal of contaminant hydrology, 147, 25-33 (2013-03-19)
Acidification due to microbial dechlorination of trichloroethene (TCE) can limit the bio-enhanced dissolution of TCE dense non-aqueous phase liquid (DNAPL). This study related the dissolution enhancement of a TCE DNAPL to the pH buffer capacity of the medium and the
Sheng Feng et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 915-916, 28-32 (2013-01-15)
This paper described a sensitive and rapid method based on ultra-performance liquid chromatography coupled to tandem mass spectrometry (UPLC-MS/MS) for the determination of phenylephrine in human plasma. Plasma samples were pre-purified by solid-phase extraction (SPE). The chromatographic separation was achieved
Christian Sattler et al.
Molecular genetics and genomics : MGG, 288(9), 413-424 (2013-06-27)
Methane is a key intermediate in the carbon cycle and biologically produced by methanogenic archaea. Most methanogens are able to conserve energy by reducing CO2 to methane using molecular hydrogen as electron donor (hydrogenotrophic methanogenesis), but several hydrogenotrophic methanogens can
Shuning Wang et al.
Applied and environmental microbiology, 79(19), 6176-6179 (2013-07-23)
Cell extracts of uric acid-grown Clostridium acidurici catalyzed the coupled reduction of NAD(+) and ferredoxin with formate at a specific activity of 1.3 U/mg. The enzyme complex catalyzing the electron-bifurcating reaction was purified 130-fold and found to be composed of
Tian Tian et al.
Journal of chromatography. A, 1275, 17-24 (2013-01-12)
Solid phase extraction (SPE) has emerged as the widely used technique for sample preparation in the analytical process. Recent research trends of SPE are toward developing novel adsorbents to enrich the analytes simply and effectively. In this study, we proposed
Di Wu et al.
Protein expression and purification, 91(1), 49-53 (2013-07-23)
Metchnikowin is a proline-rich peptide from Drosophila with antibacterial and antifungal activities. Its commercial application is limited due to the low immune-inducible expression in vivo. Here we present a method to produce high-yield metchnikowin in recombinant Escherichia coli. The genes
Kyle C Costa et al.
mBio, 4(2), doi:10-doi:10 (2013-02-28)
Hydrogenotrophic methanogenic Archaea require reduced ferredoxin as an anaplerotic source of electrons for methanogenesis. H(2) oxidation by the hydrogenase Eha provides these electrons, consistent with an H(2) requirement for growth. Here we report the identification of alternative pathways of ferredoxin
Cláudia Freitas et al.
Applied biochemistry and biotechnology, 169(7), 2038-2048 (2013-01-30)
The use of lignocellulosic materials as substrate for bioethanol production is considered a cost-effective approach to make the biofuel production process economically sustainable. However, lignocellulosic hydrolysis releases toxic compounds such as weak acids which inhibit microorganism growth and ethanol production.
A Hafeez et al.
Poultry science, 93(7), 1754-1763 (2014-05-28)
Minerals play an important role for growth and bone stability in broilers. Thermal treatment and inclusion of organic acids in feed may affect the mineral absorption and tibial quality in broilers. The study was conducted to investigate the effect of
Xiaoyuan Zhou et al.
ChemSusChem, 6(2), 383-388 (2013-01-03)
We report the one-pot alkylation of mesitylene with carbohydrate-derived 5-(hydroxymethyl)furfural (HMF) as a step toward diesel-range liquids. Using FeCl(3) as a catalyst, HMF is shown to alkylate toluene, xylene, and mesitylene in high yields in CH(2)Cl(2) and MeNO(2) solvents. Efforts
Kyle C Costa et al.
Journal of bacteriology, 195(22), 5160-5165 (2013-09-17)
Flavin-based electron bifurcation has recently been characterized as an essential energy conservation mechanism that is utilized by hydrogenotrophic methanogenic Archaea to generate low-potential electrons in an ATP-independent manner. Electron bifurcation likely takes place at the flavin associated with the α
R Blank et al.
Journal of animal science, 90 Suppl 4, 212-214 (2013-02-13)
Two studies, arranged according to a 4 × 4 Latin square design, were conducted to assess effects of dietary acidification on fungal 3-phytase (PHY) efficacy in growing pigs. In Exp. 1, effects of supplementing 500 units/kg feed of PHY and
Scott D Hamilton-Brehm et al.
Extremophiles : life under extreme conditions, 17(2), 251-263 (2013-01-25)
A novel sulfate-reducing bacterium designated OPF15(T) was isolated from Obsidian Pool, Yellowstone National Park, Wyoming. The phylogeny of 16S rRNA and functional genes (dsrAB) placed the organism within the family Thermodesulfobacteriaceae. The organism displayed hyperthermophilic temperature requirements for growth with
Kyle C Costa et al.
Journal of bacteriology, 195(7), 1456-1462 (2013-01-22)
Hydrogenotrophic methanogenic Archaea are defined by an H2 requirement for growth. Despite this requirement, many hydrogenotrophs are also capable of growth with formate as an electron donor for methanogenesis. While certain responses of these organisms to hydrogen availability have been
Yana Ryzhmanova et al.
Extremophiles : life under extreme conditions, 17(5), 851-859 (2013-07-25)
New strains of sulfate-reducing bacteria were isolated from two alkaline brackish lakes located in the Siberian region of Russia, namely in the Southern Transbaikalia, Buriatia. The article presents data describing morphology, physiology, and biochemical characteristics of the isolated strains. These
Lydia Beyer et al.
Journal of bacteriology, 195(7), 1428-1435 (2013-01-22)
Enterobacteria such as Escherichia coli generate formate, lactate, acetate, and succinate as major acidic fermentation products. Accumulation of these products in the cytoplasm would lead to uncoupling of the membrane potential, and therefore they must be either metabolized rapidly or
Lolo Wal Marzan et al.
Archives of microbiology, 195(3), 161-171 (2013-01-01)
Effect of acidic condition on the fermentation characteristics was investigated by the continuous culture of Escherichia coli. In accordance with down-regulation of crp gene transcript level as well as up-regulation of arcA, the expressions of the TCA cycle genes were
Microbiology. An enzymatic route to H2 storage.
Inês A C Pereira
Science (New York, N.Y.), 342(6164), 1329-1330 (2013-12-18)
Sai Duan et al.
Physical chemistry chemical physics : PCCP, 15(13), 4625-4633 (2013-02-21)
Local structures and adsorption energies of a formic acid molecule and its decomposed intermediates (H, O, OH, CO, HCOO, and COOH) on highly electrocatalytically active mushroom-like Au-core@Pd-shell@Pt-cluster nanoparticles with two atomic layers of the Pd shell and stoichiometric Pt coverage
Bio-inspired catalytic imine reduction by rhodium complexes with tethered Hantzsch pyridinium groups: evidence for direct hydride transfer from dihydropyridine to metal-activated substrate.
Alex McSkimming et al.
Angewandte Chemie (International ed. in English), 52(12), 3411-3416 (2013-02-27)
Nicolaas A Verwey et al.
Amyloid : the international journal of experimental and clinical investigation : the official journal of the International Society of Amyloidosis, 20(3), 179-187 (2013-07-09)
Abstract Amyloid β-peptide (Aβ) is a key molecule in Alzheimer's disease (AD). Reliable immunohistochemical (IHC) methods to detect Aβ and Aβ-associated factors (AAF) in brain specimens are needed to determine their role in AD pathophysiology. Formic acid (FA) pre-treatment, which
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