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Exibindo 1-30 of 2801 resultados for "

45983

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Zhenchang Liang et al.
PloS one, 9(8), e105146-e105146 (2014-08-19)
Grapes are rich in phytochemicals with many proven health benefits. Phenolic profiles, antioxidant and antiproliferative activities of twenty-four selected Vitis vinifera grape cultivars were investigated in this study. Large ranges of variation were found in these cultivars for the contents
Christoph Lange et al.
Journal of clinical microbiology, 52(12), 4155-4162 (2014-09-19)
Antibiotic resistance in Gram-negative microorganisms is an increasing health care problem. The rapid detection of such resistance is crucial for starting an early specific therapy and to enable initiation of the required hygiene measures. With continued emphasis on reducing the
Masahiko Isaka et al.
The Journal of antibiotics, 68(1), 47-51 (2014-07-06)
Two new ascochlorin derivatives, nectchlorins A (1) and B (2), together with eight known compounds (3-10), were isolated from cultures of the leafhopper pathogen Microcera sp. BCC 17074. The structures were elucidated on the basis of NMR spectroscopic and mass
Kristina Haslinger et al.
Chembiochem : a European journal of chemical biology, 15(18), 2719-2728 (2014-11-02)
Bacterial cytochrome P450s form a remarkable clade of the P450 superfamily of oxidative hemoproteins, and are often involved in the biosynthesis of complex natural products. Those in a subgroup known as "Oxy enzymes" play a crucial role in the biosynthesis
Melanie L Downs et al.
Journal of agricultural and food chemistry, 62(48), 11767-11775 (2014-11-13)
Although English walnut is a commonly allergenic tree nut, walnut allergens have been poorly characterized to date. The objective of this work was to characterize the natural, low molecular weight (LMW) allergens from walnut. A protocol was developed to purify
Carla M Teglia et al.
Analytical and bioanalytical chemistry, 406(30), 7989-7998 (2014-11-06)
This paper reports the development of a method based on high-performance liquid chromatography (HPLC) coupled to second-order data modeling with multivariate curve resolution-alternating least-squares (MCR-ALS) for quantification of retinoic acid and its main isomers in plasma in only 5.5 min. The
YuXia Zhou et al.
Journal of separation science, 37(11), 1248-1255 (2014-03-13)
The characterization of process-related impurities and forced degradants of alogliptin benzoate (Alb) in bulk drugs and a stability-indicating HPLC method for the separation and quantification of all the impurities were investigated. Alb was found to be unstable under acid and
Joanna C Young et al.
Nature communications, 5, 5887-5887 (2014-12-20)
The hallmark of enteropathogenic Escherichia coli (EPEC) infection is the formation of actin-rich pedestal-like structures, which are generated following phosphorylation of the bacterial effector Tir by cellular Src and Abl family tyrosine kinases. This leads to recruitment of the Nck-WIP-N-WASP
Daisuke Tsuchida et al.
Journal of the American Society for Mass Spectrometry, 25(10), 1747-1754 (2014-07-30)
Information on the higher-order structure is important in the development of biopharmaceutical drugs. Recently, hydrogen/deuterium exchange coupled with mass spectrometry (HDX-MS) has been widely used as a tool to evaluate protein conformation, and unique automated systems for HDX-MS are now
Sándor Gonda et al.
Phytochemistry, 106, 44-54 (2014-08-02)
Tissue cultures of a medicinal plant, Plantago lanceolata L. were screened for phenylethanoid glycosides (PGs) and other natural products (NPs) with LC-ESI-MS(3). The effects of N source concentration and NH4(+)/NO3(-) ratio were evaluated in a full-factorial (FF) experiment. N concentrations
Mwafaq Ibdah et al.
Phytochemistry, 107, 24-31 (2014-08-26)
The apple tree (Malus sp.) is an agriculturally and economically important source of food and beverages. Many of the health beneficial properties of apples are due to (poly)phenolic metabolites that they contain, including various dihydrochalcones. Although many of the genes
Natália Martins et al.
Food chemistry, 167, 131-137 (2014-08-26)
Bioactivity of thyme has been described, but mostly related to its essential oils, while studies with aqueous extracts are scarce. Herein, the antioxidant and antibacterial properties of decoction, infusion and hydroalcoholic extract, as also their phenolic compounds, were evaluated and
Rosa Perestrelo et al.
Journal of chromatography. A, 1381, 54-63 (2015-01-27)
An improved, reliable and powerful analytical strategy based on digitally controlled microextraction by packed sorbent (MEPS) combined with ultrahigh pressure liquid chromatography (UHPLC) was validated for the simultaneous identification and quantification of major furanic derivatives, namely 5-hydroxymethyl-2-furaldehyde (5HMF), 5-methyl-2-furaldehyde (5MF)
Jinfeng Hou et al.
BioMed research international, 2014, 850493-850493 (2014-07-22)
FLZ (N-[2-(4-hydroxy-phenyl)-ethyl]-2-(2,5-dimethoxy-phenyl)-3-(3-methoxy-4-hydroxy-phenyl)-acrylamide) is a novel synthetic squamosamide derivative and a potential anti-Parkinson's disease (PD) agent. The objective of the present study was to investigate the penetration of free FLZ across the BBB and the effects of P-gp inhibition on FLZ
Abdelmonaim Azzouz et al.
Food chemistry, 178, 63-69 (2015-02-24)
A sensitive, selective, efficient gas chromatography-mass spectrometry method for the simultaneous determination of 22 pharmacologically active substances (antibacterials, nonsteroidal antiinflammatories, antiseptics, antiepileptics, lipid regulators, β-blockers and hormones) in eggs and honey was developed. The sample pretreatment includes precipitation of proteins
Martin Schäfer et al.
Journal of integrative plant biology, 57(2), 198-212 (2014-06-14)
Nearly half a century ago insect herbivores were found to induce the formation of green islands by manipulating cytokinin (CK) levels. However, the response of the CK pathway to attack by chewing insect herbivores remains unclear. Here, we characterize the
Zhi-Yuan Wu et al.
ChemMedChem, 9(7), 1546-1555 (2014-06-05)
Nineteen new halogenated diarylpyridinamine (DAPA) analogues modified at the phenoxy C-ring were synthesized and evaluated for anti-HIV activity and certain drug-like properties. Ten compounds showed high anti-HIV activity (EC50 <10 nM). In particular, (E)-6-(2''-bromo-4''-cyanovinyl-6''-methoxy)phenoxy-N(2) -(4'-cyanophenyl)pyridin-2,3-diamine (8 c) displayed low-nanomolar antiviral potency (3-7 nM)
Da-Hye Kim et al.
Environmental pollution (Barking, Essex : 1987), 192, 171-178 (2014-06-24)
Serum and urine samples from 120 children aged 5-13 years from Dae-gu, Korea, were analyzed for 16 perfluorinated compounds (PFCs). The total PFC concentrations in the serum were 4.26-29.70 ng/mL, and perfluorohexanesulfonate (PFHxS), perfluorooctanoic acid (PFOA), perfluorooctanesulfonate (PFOS, which was dominant
Elena N Ilina et al.
The Journal of molecular diagnostics : JMD, 11(1), 75-86 (2008-12-20)
The present study investigates the suitability of direct bacterial profiling as a tool for the identification and subtyping of pathogenic Neisseria. The genus Neisseria includes two human pathogens, Neisseria meningitidis and Neisseria gonorrhoeae, as well as several nonpathogenic Neisseria species.
Janine Winkler et al.
Food additives & contaminants. Part A, Chemistry, analysis, control, exposure & risk assessment, 32(3), 371-380 (2015-04-08)
A dose-response study was carried out to examine the carryover of zearalenone (ZEN), deoxynivalenol (DON) and their metabolites into bovine milk. Therefore, a feeding trial with 30 dairy cows fed with three different levels of Fusarium (FUS) toxin-contaminated maize was
Beatrice Stubendorff et al.
World journal of urology, 32(6), 1619-1624 (2014-02-20)
Early diagnosis of acute rejection and effective immunosuppressive therapy lead to improvement in graft survival following kidney transplantation. In this study, we aimed to establish a urinary protein profile suitable to distinguish between patients with rejection and stable graft function
Sufang Wang et al.
Biochemical pharmacology, 92(3), 506-516 (2014-09-30)
Organophosphate esters (OPEs), a major group of organophosphorus flame retardants, are regarded as emerging environmental contaminants of health concern. Amino acid decarboxylases catalyze the conversion of amino acids into polyamines that are essential for cell proliferation, hypertrophy and tissue growth.
Xiang-yang Wang et al.
Journal of chromatographic science, 52(8), 814-817 (2013-08-13)
A simple, accurate and reliable method for the simultaneous separation and determination of six active components (protocatechuic acid, chlorogenic acid, caffeic acid, paeoniflorin, ferulic acid and rosmarinic acid) in traditional Chinese medicinal preparation Cerebralcare Granule(®) (CG) was developed using reverse-phase
Mamdouh R Rezk et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 978-979, 103-110 (2014-12-23)
A rapid, simple, sensitive and specific LC-MS/MS method was developed and validated for the simultaneous quantification of four antimicrobials commonly used in aquaculture, namely ciprofloxacin (CPX), trimethoprim (TMP), sulphadimethoxine (SDM) and florphenicol (FLOR) in fish tissues. The LC-MS/MS was operated
Forouzan Aboufazeli et al.
Journal of the American Society for Mass Spectrometry, 26(4), 587-595 (2015-01-15)
Fragmentation of glycopeptides in tandem mass spectrometry (MS/MS) plays a pivotal role in site-specific protein glycosylation profiling by allowing specific oligosaccharide compositions and connectivities to be associated with specific loci on the corresponding protein. Although MS/MS analysis of glycopeptides has
Ricky D Holland et al.
Rapid communications in mass spectrometry : RCM, 28(23), 2617-2626 (2014-11-05)
The identification of bacteria based on mass spectra produced by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS) has become routine since its introduction in 1996. The major drawback is that bacterial patterns produced by MALDI are dependent on sample preparation
Christian Galicia et al.
Molecular immunology, 65(2), 250-258 (2015-02-24)
Latex allergy is a health problem that mainly affects medical environments, causing anaphylactic shocks in extreme cases. Sensitization and reactions to this material is closely linked to the use of latex gloves. The objective of this study was to purify
Alexey Dudnik et al.
Applied and environmental microbiology, 80(12), 3741-3748 (2014-04-15)
Syringolin A, the product of a mixed nonribosomal peptide synthetase/polyketide synthase encoded by the syl gene cluster, is a virulence factor secreted by certain Pseudomonas syringae strains. Together with the glidobactins produced by a number of beta- and gammaproteobacterial human
Meenakshi Mehrotra et al.
Leukemia & lymphoma, 55(11), 2538-2548 (2014-01-23)
Array-based comparative genomic hybridization (aCGH) chromosomal analysis facilitates rapid detection of cytogenetic abnormalities previously undetectable by conventional cytogenetics. In this study, we analyzed 48 uniformly treated patients with acute myeloid leukemia (AML) by 44K aCGH and correlated the findings with
Shilin Cheung et al.
Journal of pharmaceutical and biomedical analysis, 94, 12-18 (2014-02-19)
CE coupled with UV detection was assessed as a possible platform for the chemical identity and purity analysis of positron emission tomography (PET) tracers using [(18)F]FAC and [(18)F]FLT as examples. Representative samples containing mixtures of the tracers plus well-known impurities
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