Search Results
Results 1 - 50 of 4620
1 2 3 4 5 6 7 8 9 10 >
Udompijitkul Pathima P Department of Biomedical Sciences, Oregon State University, Corvallis, OR 97331, USA; Department of Microbiology, Oregon State University, Corvallis, OR 97331, USA; Department of Food Science and Technology, Faculty of Agro-Industry, Kasetsart University, Bangkok, - - 2014
Clostridium perfringens spore germination plays a critical role in the pathogenesis of C. perfringens-associated food poisoning (FP) and non-food-borne (NFB) gastrointestinal diseases. Germination is initiated when bacterial spores sense specific nutrient germinants (such as amino acids) through germinant receptors (GRs). In this study, we aimed to identify and characterize amino acid ...
Wyrzykowski D D Faculty of Chemistry, University of Gdańsk, Wita Stwosza, 63, 80-308, Gdańsk, - - 2014
The isothermal titration calorimetry (ITC) technique supported by potentiometric titration data was used to study the interaction of zinc ions with pH buffer substances, namely 2-(N-morpholino)ethanesulfonic acid (Mes), piperazine-N,N'-bis(2-ethanesulfonic acid) (Pipes), and dimethylarsenic acid (Caco). The displacement ITC titration method with nitrilotriacetic acid as a strong, competitive ligand was applied ...
Terenzi Alessio A Dipartimento di Scienze e Tecnologie Biologiche, Chimiche e Farmaceutiche, Viale delle Scienze, Edificio 17, 90128 Palermo, Italy. - - 2014
Zinc(ii) complexes are effective and selective nucleic acid-binders and strongly fluorescent molecules in the low energy range, from the visible to the near infrared. These two properties have often been exploited to quantitatively detect nucleic acids in biological samples, in both in vitro and in vivo models. In particular, the ...
Yang Fanzhi - - 2014
A ruthenium(II) complex derived from the electron-deficient, aromatic carboxylic acid 3-(F3C)C6H4CO2H proved to be a highly efficient catalyst for the dehydrative alkyne annulation by NH-free hydroxamic acids in water. The C-H/N-OH functionalization occurred with excellent positional selectivity as well as ample substrate scope, and set the stage for effective intermolecular ...
Yin JieXiang J School of Chemistry, University of Wollongong, Wollongong, New South Wales 2522, Australia. - - 2014
The palladium(ii)-catalysed addition of arylboronic acids to vinylaziridines has been developed. This reaction proceeds via an insertion/ring-opening process to provide (Z)-allylsulfonamides preferentially. This stereoselectivity is complimentary to existing methods that typically proceed via a SN2' mechanism to yield (E)-allylsulfonamides. Electron-deficient arylboronic acids were the optimum substrates for this reaction, while ...
Zhao X X Institute of Food Research, Norwich Research Park, Colney, Norwich NR4 7UA, United - - 2014
Duckweed is potentially an ideal biofuel feedstock due to its high proportion of cellulose and starch and low lignin content. However, there is little detailed information on the composition and structure of duckweed cell walls relevant to optimising the conversion of duckweed biomass to ethanol and other biorefinery products. This ...
Sakai Norio - - 2014
Described herein is the direct chlorination of carboxylic acids using copper(II) chloride via a gallium(III)-catalyzed reduction in the presence of a hydrosiloxane. During this reductive chlorination, the counter anions of CuCl2 functioned as a chloride source.
Suneesh A S AS Fuel Chemistry Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, - - 2015
The surface of the silica gel was modified with diglycolamic acid moieties and the product (Si-DGAH) was characterized by elemental analysis, TG-DTA, (1)H and (29)Si NMR and scanning electron microscopy (SEM). The adsorption behavior of hazardous americium (III) and europium (III) in Si-DGAH was studied from aqueous nitric acid medium ...
Savourey Solène S CEA, IRAMIS, NIMBE, CNRS UMR 3299, CEA/Saclay, 91191 Gif-sur-Yvette, France. - - 2014
A novel methodology is presented for the direct methylation of amines, using formic acid as a unique source of carbon and hydrogen. Based on ruthenium(ii) catalysts, the formation of the N-CH3 group proceeds via an efficient formylation/transfer hydrogenation pathway.
Abeer Muhammad Mustafa MM Centre for Drug Delivery Research, Faculty of Pharmacy, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz 50300, Kuala Lumpur, - - 2014
Acrylated abietic acid (acrylated AbA) and acrylated abietic acid-grafted bacterial cellulose pH sensitive hydrogel (acrylated AbA-g-BC) were prepared by a one-pot synthesis. The successful dimerization of acrylic acid (AA) and abietic acid (AbA) and grafting of the dimer onto bacterial cellulose (BC) was confirmed by (13)C solid state NMR as ...
Szostak Michal - - 2014
Samarium(II) iodide-water-amine reagents have emerged as some of the most powerful reagents (Standard reduction potential = 2.8 V) for the reduction of unactivated carboxylic acid derivatives to primary alcohols under single electron transfer conditions, a transformation that had been considered to lie outside the scope of the classic SmI2 reductant ...
Duan Xiangke X Institute of Modern Biopharmaceuticals, State Key Laboratory Breeding Base of Eco-Environment and Bio-Resource of the Three Gorges Area, Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, School of Life Sciences, Southwest University, Beibei, Chongqing, 400715, - - 2014
Abundant mycolic acids are the hallmark of Mycobacteria cell wall. The biosynthesis of mycolic acids fulfilled by type I(Fas-I) and type II(Fas-II)synthase systems necessitates long chain fatty acid as the raw material. Fas-I is responsible for de novo fatty acid synthesis to form 16-24 carbons length fatty acids and then ...
Nageswar Rao D D Academy of Scientific and Innovative Research (AcSIR), Canal Road, Jammu-180001, - - 2014
Copper(ii)-catalyzed boronic acid promoted C-N bond cross-coupling reactions have been successfully developed for sequential N-arylation of C-amino-NH-azoles. These general protocols are compatible with a variety of aryl/hetero-aryl boronic acids and provided rapid access to a diverse array of diarylaminoazole derivatives in a two-step sequence or in one-pot.
El Khatib Mirna M Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United - - 2014
An effective protocol toward the O-arylation of β-hydroxy-α-amino acid substrates serine and threonine has been developed via Chan-Lam cross-coupling. This Cu(II)-catalyzed transformation involves benign open-flask conditions that are well-tolerated with a variety of protected (Boc-, Cbz-, Tr-, and Fmoc-) serine and threonine derivatives and various potassium organotrifluoroborates and boronic acids.
Adhikari Birendra Babu BB Department of Chemistry and Biochemistry, California State University Long Beach, 1250 Bellflower Blvd., Long Beach, 90840, CA, USA. - - 2014
p-tert-Butylcalixarene hexacarboxylic acid initially binds with low symmetry, to later adopt a highly symmetric up-down alternating conformation in the presence of Pb, Sr or Ba. The conformational dynamics for the three ions are distinct, from 15 hours, to 20 days, to 38 days, respectively.
Sowa Maciej M Faculty of Chemistry, Silesian University of Technology, B. Krzywoustego Street 6, 44-100 Gliwice, - - 2014
The work presents results of the studies performed on electropolishing of pure niobium in a bath that contained: sulphuric acid, hydrofluoric acid, ethylene glycol and acetanilide. After the electropolishing, the specimens were subjected to anodic passivation in a 1moldm(-3) phosphoric acid solution at various voltages. The surface morphology, thickness, roughness ...
Gültekin Aytaç A Karamanoğlu Mehmetbey University, Faculty of Engineering, Department of Energy Systems Engineering, Karaman 70200, Turkey. Electronic address: - - 2014
Determination of cholic acid is very important and necessary in body fluids due to its both pharmaceutical and clinical significance. In this study, a quartz crystal microbalance (QCM) nanosensor, which is imprinted cholic acid, has been developed for the assignation of cholic acid. The cholic acid selective memories have been ...
Ozkan Adile A Department of Neurology, Faculty of Medicine, Çanakkale 18 Mart University, Kepez, Çanakkale, Turkey, - - 2014
Stroke is still a major cause of death and permanent neurological disability. As humic acids are well-known antioxidant molecules, the purpose of this study was to investigate the potential neuroprotective effects of humic acid in a focal cerebral ischemia model. Twenty-four rats were divided equally into three groups. A middle ...
Park Hee-Jun HJ Department of Chemistry, Queen's University , Kingston, Ontario K7L 3N6, - - 2014
Three triarylboron- (Mes2BAr-) functionalized dipicolinic acids, namely, 4-(4-(dimesitylboranyl)-2,3,5,6-tetramethylphenyl)pyridine-2,6-dicarboxylic acid (H2L1), 4-(4-(4-dimesitylboranyl)-2,3,5,6-tetramethylphenyl)-1H-1,2,3-triazol-1-yl)pyridine-2,6-dicarboxylic acid (H2L2), and 4-(4-(4-dimesitylboranyl) phenyl)-1H-1,2,3-triazol-1-yl)pyridine-2,6-dicarboxylic acid (H2L3), have been designed and synthesized. Lanthanide(III) complexes with the general formula of [NBu4]3[LnL3] (Ln = Eu or Tb; L = L1, L2, or L3) were obtained. The new triarylboron-functionalized ligands were found ...
Cohen Paul - - 2014
It is common to denature proteins by high temperatures or by adding guanidinium chloride (GdmCl). However, the physical mechanism of denaturation is not well understood. Based on extensive experimental data, we developed a thermodynamic binding-polynomial model for the process of transferring nonpolar amino acids from water into GdmCl solutions, as ...
Li Wenchen W a Department of Chemical and Biomolecular Engineering , The University of Akron , Akron 44325 , OH , - - 2014
A group of five amino acid containing zwitterionic vinyl monomers, based on serine, lysine, ornithine, glutamic acid, and aspartic acid, respectively, were proposed and developed for potential antifouling applications. Their polymer brushes were grafted on gold chips by surface-initiated photoiniferter-mediated polymerization. We then compared their performance in resisting protein adsorption ...
Davis Kathleen Marie - - 2014
Ligand exchange of hydrophilic molecules on the surface of hydrophobic iron oxide nanoparticles produced via thermal decomposition of chelated iron precursors is a common method for producing aqueous suspensions of particles for biomedical applications. Despite the wide use, relatively little is understood about the efficiency of ligand exchange on the ...
Novo-Uzal Esther E Department of Plant Biology, University of Murcia, E-30100 Murcia, Spain Department of Animal Biology, Plant Biology and Ecology, University of A Coruña, E-15071 A Coruña, Spain - - 2014
Peroxidase isoenzymes play diverse roles in plant physiology, such as lignification and defence against pathogens. The actions and regulation of many peroxidases are not known with much accuracy. A number of studies have reported direct involvement of peroxidase isoenzymes in the oxidation of monolignols, which constitutes the last step in ...
Shobharani P P Food Microbiology Department, CSIR-Central Food Technological Research Institute, Mysore, 570 020, - - 2014
The present study has been focused widely on comparative account of probiotic qualities of Bacillus spp. for safer usage. Initially, 170 heat resistant flora were isolated and selected for non-pathogenic cultures devoid of cytK, hblD, and nhe1 virulence genes. Subsequently, through biochemical tests along with 16S rRNA gene sequencing and ...
Curtis Matthew P - - 2014
Abstract The markers 3-nitrotyrosine and 3-chlorotyrosine are measured as surrogates for reactive nitrogen species and hypochlorous acid, respectively, which are both elevated in inflamed tissues of humans. Previously, 3-nitrotyrosine loss was reported when exposed to hypochlorous acid suggesting that observations of 3-nitrotyrosine underestimate the presence of reactive nitrogen species in ...
Chen Hui - - 2014
An investigation into the reactivity profile of alkyl halides has led to the development of a new method for the asymmetric synthesis of chiral heterocyclic amino acids. This protocol involves the asymmetric alkylation of the Ni(II)-complex of glycine to form an intermediate, which then decomposes to form a series of ...
Tang Xiaoling X School of Chemical and Biomedical Engineering, College of Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore, - - 2014
The production of fatty acid-derived chemicals has received a great deal of attention in recent years. In yeast cells, the main storage forms of fatty acids are TAGs. However, the conversion of TAGs into fatty acid derivatives suffers from a practical standpoint. Herein, a more direct strategy was applied to ...
Sharma Monika M Department of Biotechnology, Panjab University, Chandigarh, 160014, India, - - 2014
An extracellular lipase producing isolate Staphylococcus sp. MS1 was optimized for lipase production and its biocatalytic potential was assessed. Medium with tributyrin (0.25 %) and without any exogenous inorganic nitrogen source was found to be optimum for lipase production from Staphylococcus sp. MS1. The optimum pH and temperature for lipase production ...
Grunwald Stephan S Department of Biology, Massachusetts Institute of Technology, Bldg. 68-370, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA; Department of Biotechnology, Beuth Hochschule für Technik Berlin, 13353, Berlin, - - 2014
Formic acid, acting as both carbon and energy source, is a safe alternative to a carbon dioxide, hydrogen and dioxygen mix for studying the conversion of carbon through the Calvin-Benson-Bassham (CBB) cycle into value-added chemical compounds by non-photosynthetic microorganisms. In this work, organoautotrophic growth of Ralstonia eutropha on formic acid was ...
Alkarawi Hassan Hadi HH Functional Ecology Group, Institute of Biology and Environmental Sciences, University of Oldenburg, Box 2503, 26111 Oldenburg, Germany Foundation of Technical Education, Al-Musaib Technical College, - - 2014
Phytic acid is the major storage compound for phosphorus (P) in plants. While accounting for up to 90% in many seeds, only usually <10% of total P is found in phytic acid in green leaves. This study follows up on the findings of a recent review of the occurrence of ...
Hoene Miriam M Division of Clinical Chemistry and Pathobiochemistry, Department of Internal Medicine IV, University Hospital Tübingen, Tübingen, Germany. Electronic address: - - 2014
Brown adipose tissue (BAT) is a thermogenic organ with a vital function in small mammals and potential as metabolic drug target in humans. By using high-resolution LC-tandem-mass spectrometry, we quantified 329 lipid species from 17 (sub)classes and identified the fatty acid composition of all phospholipids from BAT and subcutaneous and ...
Ueji Kan K Surface and Interface Science Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan. - - 2014
Polymorphic transition from the 1D ribbon to the 2D carpet superstructure of squaric acid molecules on Au(111) was achieved through a thermally activated process. Our combined STM and DFT study revealed that the molecular arrangements in 1D and 2D superstructures are determined by the stability of their conformational isomers and ...
Yang Xueqiong X a Key Laboratory of Medicinal Chemistry for Natural Resource , Ministry of Education, School of Chemical Science and Technology, Yunnan University , Kunming 650091 , P.R. - - 2014
A new benzamide (1) and four known compounds (2-5) were isolated from endophytic Streptomyces YIM67086, and their structures were determined as 2-amino-3,4-dihydroxy-5-methoxybenzamide (1), 4-hydroxy-3-methoxybenzoic acid (2), phenylacetic acid (3), N-acetyltyramine (4) and p-hydroxytruxinic acid (5). Compound 5 was first found in the microorganism. The antimicrobial activities of compounds 1-5 and ...
Koopmans Marieke M Department of Agrotechnology and Food Sciences, Bioprocess Engineering Group, Wageningen University, P.O. 8129, 6700 EV, Wageningen, The Netherlands, - - 2014
To get a better understanding of sponge feeding biology and efficiencies, the fatty acid (FA) composition and (13)C natural abundance of sponges and of suspended particulate matter (SPM) from surrounding seawater was studied in different seasons at three locations. Haliclona oculata and Haliclona xena from the Oosterschelde, the Netherlands, Halichondria ...
Takahashi Toshie T United Graduate School of Drug Discovery and Medical Information Sciences, Gifu, 501-1193, - - 2014
It has been recognized that human hair lipids play crucial roles in the integrity of cells and matrices, while the details of distribution and structure of the minor lipids are hardly known. Here we investigated the lipids at the hair surface, at the interface between cuticle and cortex and in ...
Lei Fenfen F College of Light Industry and Food Sciences, South China University of Technology, Guangzhou, 510640, - - 2014
This study evaluates the hydrolysis specificity of newly developed protease from Exiguobacterium sp. SWJS2 (EP) based on the released free amino acid (FAA) during enzymolysis and through comparing with commercially available papain and Alcalase 2.4L. Results showed that EP had great potential in producing hydrolysates with better nutrition and less ...
Nakamura Shuichi S Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology , Gokiso, Showa-ku, Nagoya 466-8555, - - 2014
Highly enantioselective desymmetrization of aziridines with TMSNCS has been developed. Good yield and enantioselectivity were observed by using novel chiral imidazoline-phosphoric acid catalysts. The obtained product can be converted to a chiral β-aminothiol and a β-aminosulfonic acid.
Ewert Alice A Deutsche Forschungsanstalt für Lebensmittelchemie - - 2014
Acrolein (2-propenal) is classified as a foodborne toxicant and was shown to be present in significant amounts in heated edible oils. Up to now, its formation was mainly suggested to be from the glycerol part of triacylglycerides, although a clear influence of the unsaturation of the fatty acid moiety was ...
Kiren Yuko Y Faculty of Pharmaceutical Sciences, Hoshi University, Ebara 2-4-41 Shinagawa-ku, Tokyo, 142-8501, - - 2014
Justidrusamides A-D (1-4), four new alkaloids containing 2-aminobenzyl alcohol, succinic acid, and 2,3-dihydroxy-2-(1-hydroxyethyl) butanoic acid skeletons have been isolated from leaves of Justicia gendarussa, and their structures were elucidated using 2D NMR data and chemical means. This is the first report of a 2,3-dihydroxy-2-(1-hydroxyethyl) butanoic acid derivative in nature.
Marshall Sara - - 2014
Honeys contain phenolic compounds and α-dicarbonyls with antioxidant and anti-microbial capacities, respectively. The type and concentration of these compounds vary depending on the floral source and geographical location where the honey is produced. Seventeen varietal honeys, including 12 monofloral and 5 multi-floral honeys were sampled from different regions of Florida. ...
Arfaoui Moufida Oueslati MO a Laboratoire de Biochimie des lipides, Département de Biologie , Faculté des Sciences de Tunis , 2092 El Manar II , - - 2014
This study has determined oil, fatty acid (FA) and phytosterols content during the ripening of the Tunisian Onopordum acanthium L. seeds. In total, nine FAs and six phytosterols were identified. The main FAs were linoleic acid (0.18-8.06 mg/g of seed) followed by oleic acid (0.051-2.45 mg/g of seed), palmitic acid and stearic ...
Peng Liang L College of Life Sciences, Northwest A & F University, Yangling, P. R. - - 2014
Salvia miltiorrhiza is a significant source of bioactive compounds providing human health effects. Here, we surveyed root yield and the active constituents' divergences of second generation S. miltiorrhiza (SP2) responding to a spaceflight environment. High-performance liquid chromatography was conducted for the comprehensive constituents' characterizations of 28 SP2 lines (224 individuals) ...
Eustáquio Alessandra S AS Natural Products Laboratory, Worldwide Medicinal Chemistry, Pfizer Worldwide Research and Development, Groton, CT 06340 - - 2014
Spliceostatins are potent spliceosome inhibitors biosynthesized by a hybrid nonribosomal peptide synthetase-polyketide synthase (NRPS-PKS) system of the trans-acyl transferase (AT) type. Burkholderia sp. FERM BP-3421 produces hemiketal spliceostatins, such as FR901464, as well as analogs containing a terminal carboxylic acid. We provide genetic and biochemical evidence for hemiketal biosynthesis by ...
Hirai Sho S School of Environmental Science and Engineering, Kochi University of - - 2014
A commercially purchased acetoacetamide was found to dimerize during storage for several months to afford 4,6-dimethyl-2-pyridone-5-carboxamide. We successfully achieved the quantitative dimerization of acetoacetamide by using an acid catalyst. It was also found that the pyridone formed served as a self-catalyst of the dimerization.
Luo Shangwen S Department of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, University of Illinois at Chicago , 833 S. Wood Street, Chicago, Illinois 60612, United - - 2014
Two new cyclic lipopeptides, trichormamides A (1) and B (2), were isolated from the cultured freshwater cyanobacterium Trichormus sp. UIC 10339. The strain was obtained from a sample collected in Raven Lake in Northern Wisconsin. The planar structures of trichormamides A (1) and B (2) were determined using a combination ...
Cheng Lili L School of Bioscience and Bioengineering, South China University of Technology, Guangzhou, 510006, P. R. China. - - 2014
Fermented onion products are popular in many countries. We conducted fermentation with and without salt to identify the microorganisms responsible for onion fermentation and the unique taste of fermented onion. The results of PCR-DGGE (polymerase chain reaction-denaturing gradient gel electrophoresis) revealed that lactic acid bacteria (Lactobacillus zymae, L. malefermentans, L. ...
Belge Burcu - - 2014
Cuticle composition and structure may be relevant factors affecting the storage potential of fruits, but very few studies have analyzed fruit cuticle composition from a postharvest perspective. In this work, the chemical composition of waxes and cutin (major cuticular components) was analyzed in cuticle samples isolated from 'Celeste' and 'Somerset' ...
Lemke Rachelle A S RA Departments of - - 2014
Fatty acids play important functional and protective roles in living systems. This paper reports on the synthesis of a previously unidentified 19 carbon furan-containing fatty acid, 10,13-epoxy-11-methyl-octadecadienoate (9-(3-methyl-5-pentylfuran-2-yl)nonanoic acid) (19Fu-FA), in phospholipids from Rhodobacter sphaeroides. We show that 19Fu-FA accumulation is increased in cells containing mutations that increase the transcriptional ...
Horinouchi Masae M Environmental Molecular Biology Laboratory - - 2014
Comamonas testosteroni TA441 degrades steroids via aromatization and meta-cleavage of the A-ring followed by hydrolysis and produces 9,17-dioxo-1,2,3,4,10,19-hexanorandrostan-5-oic acid as an intermediate compound. Herein, we identify a new intermediate compound, 9α-hydroxy-17-oxo-1,2,3,4,10,19-hexanorandrostan-5-oic acid. Open reading frame (ORF)28- and ORF30-encoded acyl-coenzyme A (acyl-CoA) dehydrogenase was shown to convert the CoA-ester of 9α-hydroxy-17-oxo-1,2,3,4,10,19-hexanorandrostan-5-oic ...
Zhang Jianguo J School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, - - 2014
Microbial lipid is a promising source of oil to produce biofuel if it can be generated from lignocellulosic materials. Mortierella isabellina is a filamentous fungal species featuring high content of oil in its cell biomass. In this work, M. isabellina was studied for lipid production from corn stover. The experimental ...
1 2 3 4 5 6 7 8 9 10 >