Search Results
Results 651 - 700 of 4189
< 9 10 11 12 13 14 15 16 17 18 19 >
Darkwah J - - 2013
In rapidly disintegrating tablets (RDTs) manufactured by freeze-drying processes, the % crystallinity of the freeze-dried matrix underpins the physical properties such as mechanical strength and dissolution profile. This study examines the feasibility of using terahertz pulsed spectroscopy (TPS) as an off-line tool (in the first instance) for assessing the degree ...
Dias Maria Inês - - 2013
Medicinal plants used in folk medicine are being increasingly studied and used on pharmaceutical, food and nutraceutical fields. Herein, wild and commercial samples of Achillea millefolium L. (yarrow) were chemically characterized with respect to their macronutrients, free sugars, organic acids, fatty acids and tocopherols. Furthermore, in vitro antioxidant properties (free ...
Tada Tatsuya - - 2013
Two novel IMP-type metallo-β-lactamase variants, IMP-43 and IMP-44, were identified in multidrug-resistant Pseudomonas aeruginosa isolates obtained in medical settings in Japan. Analysis of their predicted amino acid sequences revealed that IMP-43 had an amino acid substitution (Val67Phe) compared with IMP-7 and that IMP-44 had two substitutions (Val67Phe and Phe87Ser) compared ...
Karnjanapratum Supatra - - 2013
Chemical compositions and nutritive value of the edible portions including foot, mantle and viscera of Asian hard clam (Meretrix lusoria) harvested from the coast of Andaman Sea were determined. Proximate compositions varied with portions tested. Edible portions had moisture (76.23-84.22%) and protein (9.09-12.75%) as the major components. Carbohydrate (0.32-7.89%), fat ...
Miyakawa Takuya T Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, - - 2013
STK_08120 is a member of the thermoacidophile-specific DUF3211 protein family from Sulfolobus tokodaii strain 7. Its molecular function remains obscure, and sequence similarities for obtaining functional remarks are not available. In this study, the crystal structure of STK_08120 was determined at 1.79-Å resolution to predict its probable function using structure ...
Cao Dongdong D Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, - - 2013
New chiral bifunctional thiourea-phosphonium salts have been developed based on natural amino acids as highly efficient phase-transfer catalysts in the enantioselective aza-Henry reaction.
Prasongsuk Sehanat - - 2013
Cultured cell extracts from ten tropical strains of Aureobasidium pullulans were screened for antifungal activity against four pathogenic Aspergillus species (Aspergillus flavus, Aspergillus niger, Aspergillus fumigatus, and Aspergillus terreus) using the well diffusion and conidial germination inhibition assays. The crude cell extract from A. pullulans NRRL 58536 resulted in the ...
Ellisor Debra - - 2013
Blubber has been used for decades to monitor exposure of marine mammals to persistent organic pollutants (POPs). However, little is known about POP variability as a function of blubber depth and across the body of the animal. Remote blubber biopsy sampling (e.g, projectile biopsy) is the most common technique used ...
Urashima Tadasu - - 2013
Previous structural characterizations of marsupial milk oligosaccharides had been performed in only two macropod species, the tammar wallaby and the red kangaroo. To clarify the homology and heterogeneity of milk oligosaccharides among marsupial species, which could provide information on their evolution, the oligosaccharides of the koala milk carbohydrate fraction were ...
Nafikov R A - - 2013
The main goal of this study was to develop tools for genetic selection of animals producing milk with a lower concentration of saturated fatty acids (SFA) and a higher concentration of unsaturated fatty acids (UFA). The reasons for changing milk fatty acid (FA) composition were to improve milk technological properties, ...
Lu He - - 2013
Two recombinant Rhizopus stolonifer ∆6-fatty acid desaturase enzymes with different-length N-termini were cloned and expressed in Saccharomyces cerevisiae strain INVScl: LRsD6D begins with the sequence of the N-terminal of the R. stolonifer ∆6-fatty acid desaturase native, encoding a deduced polypeptide of 459 amino acids (M-S-T-L-D-R-Q-S-I-F-T-I-K-E-L-E-S-I-S-Q-R-I-H-D-G-D-E-E-A-M-K-F), whereas SRsD6D begins with the ...
Decsi Tamás - - 2013
We summarize data on the potential interaction of trans isomeric fatty acids [trans fatty acids (TFAs)] with the availability of long-chain polyunsaturated fatty acids (LC-PUFAs) in the perinatal period. Today, TFA intakes in pregnant and lactating women can be estimated to be ∼1% of energy in the majority of the ...
Song Song - - 2013
A highly efficient asymmetric hydrogenation of α,β-unsaturated carboxylic acids with tetrasubstituted olefin catalyzed by chiral spiro iridium complexes has been developed for the preparation of chiral α-substituted carboxylic acids in excellent enantioselectivities (up to 99% ee).
Wang Dong - - 2013
This work demonstrates the use of Lewis-acid catalysts, such as gamma-alumina and tungstated alumina, for selective production of linear alpha olefins by decarboxylation of lactones and unsaturated carboxylic acids.
Argov-Argaman Nurit - - 2013
Semen lipid composition was examined in young and mature bulls. Given the specific roles of various semen compartments (i.e., seminal fluid, sperm head, and sperm tail) during fertilization, we hypothesized that altered fatty acid and cholesterol composition of a specific compartment might impair semen quality and sperm function. Semen samples ...
Zhang Yaohai - - 2013
A fast and simple technique composed of dispersive liquid-liquid microextraction (DLLME) and online preconcentration MEKC with diode array detection was developed for the determination of four phenoxyacetic acids, 2,4,5-trichlorophenoxyacetic acid, 2,4-dichlorophenoxyacetic acid, 2,6-dichlorophenoxyacetic acid, and 4-chlorophenoxyacetic acid, in drinking water. The four phenoxyacetic acids were separated in reversed-migration MEKC to ...
Siless Gastón E - - 2013
Secochiliolide acid (1) isolated from the Patagonian shrub Nardophyllum bryoides, was used as a scaffold for the preparation of a series of nine derivatives. Compound 1 and its derivatives were tested against Trypanosoma cruzi epimastigotes grown in liquid media. It was first observed that secochiliolide acid (1) inhibited the proliferation ...
Kawasoko Cristiane Y - - 2013
The synthesis of new chiral seleno-, telluro-, and thio-N-Boc-γ-amino acids is described herein. These new compounds were prepared through a simple and short synthetic route, from the inexpensive and commercially-available amino acid l-glutamic acid. The products, with a highly modular character, were obtained in good to excellent yields, via hydrolysis ...
Davies Stephen G - - 2013
Asymmetric syntheses of (S,S,S)-2-amino-5-methylcyclopentanecarboxylic acid and (S,S,S)-2-amino-5-phenylcyclopentanecarboxylic acid were achieved in 9 steps from commercially available starting materials via the Ireland-Claisen rearrangement of two enantiopure β-amino allyl esters, followed by ring-closing metathesis, reduction and deprotection.
Hsieh Chia-Wen - - 2013
Red-koji vinegar, a Monascus-involved and acetic acid fermentation-derived traditional product, in which presence of monacolin K and citrinin has attracted public attention. In this study, red-koji wine was prepared as the substrate and artificially supplemented with monacolin K and citrinin and subjected to vinegar fermentation with Acetobacter starter. After 30 ...
Ahrendt Tilman - - 2013
Let it shine: The biosynthesis of the UV fluorophore legioliulin (1) from Legionella spp. was elucidated and the phenylalanine ammonium lyase LglD responsible for the formation of the starter unit cinnamic acid was biochemically characterized. Additionally, two novel derivatives differing in the starter unit have been identified by mutasynthesis experiments.
Stratford Malcolm - - 2013
Weak-acid preservatives, such as sorbic acid and acetic acid, are used in many low pH foods to prevent spoilage by fungi. The spoilage yeast Zygosaccharomyces bailii is notorious for its extreme resistance to preservatives and ability to grow in excess of legally-permitted concentrations of preservatives. Extreme resistance was confirmed in ...
Matsumoto Yusaku - - 2013
A novel metal ion-independent phospholipase B (PLB₆₈₄) from Streptomyces sp. strain NA684 was purified 264-fold from the culture supernatant with 2.85% recovery (6330 U·mg protein⁻¹). The enzyme functions as a monomer with a molecular mass of 38.9 kDa. Maximum activity was found at pH 8.4 and 50 °C. The substrate ...
Huang Zufang - - 2013
In this study, Raman spectroscopy was first used to study the linear relationship between Raman spectral intensities and citric acid concentrations in aqueous solution. By using the specific Raman band of 942 cm(-1), concentrations of citric acid ranging from 2 to 20 mg/mL were observed linearly (R(2) = 0.993), and ...
Zhou Jie - - 2013
A new liquid chromatographic method has been developed for the chiral separation of the enantiomers of mandelic acid and their derivatives 2-chloromandelic acid, 4-hydroxymandelic acid, 4-methoxymandelic acid, and 3,4,5-trismethoxymandelic acid. The enantiomers were separated by a CHIRALPAK(®) IC (250 mm×4.6 mm, 5 μm). Mandelic acid, 4-methoxymandelic acid, and 3,4,5-trismethoxymandelic acid ...
Jurišić Grubešić Renata - - 2013
A rapid reversed-phase (RP) high-performance liquid chromatography method was developed and applied for simultaneous separation, and determination of flavonoids and phenolic acids in eight Plantago L. taxa (P. altissima L., P. argentea Chaix, P. coronopus L., P. holosteum Scop. ssp. depauperata Pilger, P. holosteum ssp. holosteum, P. holosteum ssp. scopulorum ...
Kulawik Piotr - - 2013
This work determines quality properties and fatty acids content of Nile tilapia (Oreochromis niloticus) stored in ice for 21 d. The quality properties consist of thiobarbituic acid (TBA), total volatile basic nitrogen (TVB-N), trimethylamine (TMA), and microbiological analysis (total viable count (TVC), total coliform, Salmonella and Staphylococcus aureus) and determination ...
Baek Changyoon - - 2013
The current medical technology has constantly demanded novel and advanced materials exhibiting the unique physicochemical properties but, at the same time, possessing the intrinsic biocompatibility. Natural biomolecules based on materials such as peptide- (or protein-) or DNA/RNA derivatives have been formerly considered. To date, a carbohydrate-derived molecule has been a ...
Nokami Junzo - - 2013
Linoleic acid metabolites, (-)-methyl jasmonate and (+)-12-oxophytodienoic acid ((+)-12-oxo-PDA), were prepared from the same precursor (1,2-trans, 1,3-cis, 2'Z)-2-(pent-2'-enyl)-cyclopent-4-en-1,3-diol, which was obtained by regioselective pent-2-enylation of cyclopentadiene and following photooxidation to cis-1,3-diol. A methoxycarbonylmethyl substituent was introduced to the cyclopentane ring via alkylation of the pi-allyl palladium intermediate derived from (1R,2S,3S,2'Z)-3-acetoxy-2-(pent-2'-enyl)cyclopent-4-ene-1-ol ...
Meena Laxman S - - 2013
In this study, a previously uncharacterized gene (Rv0447c) of Mycobacterium tuberculosis, designated as an unknown fatty-acid methyltransferase (ufaA1), was cloned, expressed in Escherichia coli, and purified. The biochemical characterization of the purified protein (UfaA1) showed it to be a methyltransferase that catalyzes biosynthesis of the tuberculostearic acid (10-methylstearic-acid, TSA), a ...
Niu Junfeng - - 2013
Electrochemical degradation of 2,4-dichlorophenol (2,4-DCP) in aqueous solution was investigated over Ti/SnO2-Sb anode. The factors influencing the degradation rate, such as applied current density (2-40 mA/cm2), pH (3-11) and initial concentration (5-200 mg/L) were evaluated. The degradation of 2,4-DCP followed apparent pseudo first-order kinetics. The degradation ratio on Ti/SnO2-Sb anode ...
Darwish Tamim A - - 2013
Oleic acid and its phospholipid derivatives are fundamental to the structure and function of cellular membranes. As a result, there has been increasing interest in the availability of their deuterated forms for many nuclear magnetic resonance, infrared, mass spectroscopy and neutron scattering studies. Here, we present for the first time ...
Richter Hanno H Department of Biological and Environmental Engineering, Cornell University, Ithaca, NY 14853, - - 2013
To ensure economic implementation of syngas fermentation as a fuel-producing platform, engineers and scientists must both lower operating costs and increase product value. A considerable part of the operating costs is spent to procure chemicals for fermentation medium that can sustain sufficient growth of carboxydotrophic bacteria to convert synthesis gas ...
Kraus George A GA Department of Chemistry, 1605 Gilman Hall, Iowa State University, Ames, IA 50011-3111, USA. - - 2013
Both 3-farnesyl salicylic acid and 3-geranyl salicylic acid were synthesized from 2,6-dibromophenol and showed low levels of antimicrobial activity against E. coli strains.
Tea Illa - - 2013
In isotope tracer experiments used in nutritional studies, it is frequently desirable both to determine the (15) N/(14) N ratios of target compounds and to quantify these compounds. This report shows how this can be achieved in a single chromatographic run for protein amino acids using an isotope ratio mass ...
Chen Wei Ning - - 2013
Malonyl-CoA plays an important role in the synthesis and elongation of fatty acids in yeast Saccharomyces cerevisiae. Malonyl-CoA is at a low concentration inside the cell and is produced mainly from acetyl-CoA through the enzyme acetyl-CoA carboxylase. It would be beneficial to find an alternative source of malonyl-CoA to increase ...
Joo Jiyong - - 2013
Electro-oxidation of formic acid on Pt in acid is one of the most fundamental model reactions in electrocatalysis. However, its reaction mechanism is still a matter of strong debate. Two different mechanisms, bridge-bonded adsorbed formate mechanism and direct HCOOH oxidation mechanism, have been proposed by assuming a priori that formic ...
Cai Minmin - - 2013
Aerobic biodegradation of crude oil and its pathways were investigated via in vitro culture and GC-MS analysis in water flooding wells of Dagang oil field. The in vitro aerobic culture lasted 90days when 99.0% of n-alkanes and 43.03-99.9% of PAHs were degraded and the biomarkers and their ratios were changed. ...
Zhang Chunyu - - 2013
Diacylglycerol acyltransferase (DGAT) catalyses the last step in acyl-CoA-dependent triacylglycerol (TAG) biosynthesis and is an important determinant of cellular oil content and quality. In this study, a gene, designated TaDGAT2, encoding a type 2 DGAT (DGAT2)-related enzyme was identified from the oleaginous marine protist Thraustochytrium aureum. The deduced TaDGAT2 sequence ...
Zheng Lin - - 2013
Due to the poor protein solubility, hot-pressed peanut meal (HPM) has less value than cold-pressed peanut meal (CPM) in the food industry. The objective of this study was to determine whether the denatured proteins in HPM were suitable for hydrolysis by digestive enzymes. The hydrolysis characteristics and antioxidant activity of ...
Bergamini C V - - 2013
In this work, we studied the growth, survival, and peptidolytic activity of Lactobacillus plantarum I91 in a hard-cheese model consisting of a sterile extract of Reggianito cheese. To assess the influence of the primary starter and initial proteolysis level on these parameters, we prepared the extracts with cheeses that were ...
Lu Lu - - 2013
Silver nanoparticles with various sizes and shapes were prepared by adding silver nitrate to ascorbic acid solutions containing nitric acid and a dispersant (Daxad 11G). It is shown that the reaction environment significantly affects the nature of the interactions between silver ions and dispersant molecules. The stability of the Ag(+)/Daxad ...
Wu Hui - - 2013
Maca (Lepidium meyenii), a traditional food crop of the Peruvian Andes is now widely touted as a dietary supplement. Among the various chemical constituents isolated from the plant are a unique series of non-polar, long-chain fatty acid N-benzylamides known as macamides. We have synthesized 11 of the 19 reported macamides ...
Shimshoni Jakob A - - 2013
Cuticular fatty acids (CFA) are important constituents of the arthropod exoskeleton, serving as structural and defense components, and participating in intra-species communication. Here we describe for the first time a comparative analysis of the CFA profiles of three tick species of the genus Rhipicephalus: R. annulatus, R. bursa and R. ...
Mittal H - - 2013
Biodegradation studies of Gum ghatti (Gg) and acrylamide-co-acrylic acid based flocculants [Gg-cl-poly(AAm-co-AA)] have been reported using the soil composting method. Gg-cl-poly(AAm-co-AA) was found to degrade 89.76% within 60 days. The progress of biodegradation at each stage was monitored through FT-IR and SEM. Polymer was synthesized under pressure using potassium persulphate-ascorbic ...
Wu Dexi - - 2013
Steam-exploded corn stalk biomass was used as the substrate for succinic acid production via lignocellulose enzymatic hydrolysis and fermentation. Succinic acid fermentation was investigated in Escherichia coli strains overexpressing cyanobacterium Anabaena sp. 7120 ecaA gene encoding carbonic anhydrase (CA). For the washed steam-exploded corn stalk at 30 % substrate concentration, i.e., ...
Woo Jung-Kyun - - 2013
A new peptide, gombamide A (1), was isolated from the marine sponge Clathria gombawuiensis, collected from Korean waters. On the basis of the results of combined spectroscopic analyses, the structure of this compound was determined to be a cyclic C-terminally modified thiohexapeptide containing the unusual amino acid residues para-hydroxystyrylamide (pHSA) ...
Høstmark Arne Torbjørn - - 2013
Previous data suggested that intake of sodas and other acid beverages might be associated with increased levels of serum triglycerides, lowered HDL cholesterol, and increased formation of mono unsaturated fatty acids, which are the preferred ones for triglyceride synthesis. The present work is an extension of these studies. Thirty male ...
Guimarães Rafaela - - 2013
This study aimed to analyse the phenolic composition of wild fruits of Arbutus unedo (strawberry-tree), Prunus spinosa (blackthorn), Rosa canina and Rosa micrantha (wild roses). Analyses were performed by HPLC-DAD-ESI/MS. P spinosa fruits presented the highest concentration in phenolic acids (29.78mg/100g dry weight), being 3-O-caffeoylquinic acid the most abundant one, ...
Fărcaşiu Dan - - 2013
Pyridine derivatives labeled with (15) N can be prepared by the reaction of the corresponding pyrylium salts with (15) NH4 Cl in close to a stoichiometric ratio, in a sodium acetate-acetic acid buffer. In particular, the reaction of 2,6-di-tert-butylpyrylium perchlorate gave 2,6-di-tert-butylpyridine with a conversion of 95%. The compound is ...
< 9 10 11 12 13 14 15 16 17 18 19 >