Showing 1-30 of 98 results for "B103608"
Ting-ting Ren et al.
Bioresource technology, 129, 655-658 (2013-01-12)
A laboratory study was conducted to investigate the production of quorum sensing (QS) molecules by aerobic granules in membrane-partitioned bioreactor. Flow-chamber (FC) tests with Escherichia coli K12 demonstrated that granules induced more attached growth of E. coli cells than activated...
Michelle Wood et al.
Journal of chromatography. A, 1056(1-2), 83-90 (2004-12-15)
We have developed a rapid method that enables the simultaneous analysis of gamma-hydroxybutyrate (GHB) and its precursors, i.e. gamma-butyrolactone (GBL) and 1,4-butanediol (1,4-BD) in urine. The method comprised a simple dilution of the urine sample, followed by liquid chromatography-tandem mass...
Xiaocong Xie et al.
Organic letters, 15(7), 1500-1503 (2013-03-22)
Allylic cyclopropenecarboxylates undergo ring expansion reactions to give 2-allyloxyfuran intermediates, which subsequently rearrange to Δ(β,γ) butenolides via a Claisen rearrangement or to the corresponding Δ(α,β) butenolides via further Cope rearrangement. Also described are methods for chirality transfer in the rearrangement...
Kuk-Ki Hong et al.
Journal of industrial microbiology & biotechnology, 41(10), 1517-1524 (2014-08-27)
There has been a significant global interest to produce bulk chemicals from renewable resources using engineered microorganisms. Large research programs have been launched by academia and industry towards this goal. Particularly, C4 chemicals such as succinic acid (SA) and 1,4-butanediol...
Yi Dong et al.
Molecular diversity, 17(1), 1-7 (2013-01-12)
A palladium-catalyzed selective synthesis of cis- or trans-chloro-substituted-α-methylene-γ-butyrolactones from single substrate (propiolic acid) has been realized by controlling cis- or trans-chloropalladation. This method is highly effective for building C-Cl, C-O, and C-C bonds into a one-pot procedure because of its...
Xing-De Wu et al.
Fitoterapia, 85, 154-160 (2013-01-29)
Three new labdane diterpenoids, calomacrins A-C (1-3), and a new diaryl butyrolactone-type lignan, calomacrol A (8), as well as four known labdane diterpenoids and six known lignans, were isolated from the twigs and leaves of Calocedrus macrolepis. Structures of the...
R van Vugt et al.
Acta anaesthesiologica Belgica, 63(3), 139-141 (2013-02-13)
We present two cases of GBL intoxication. Patient A is a 45-year old man who lost consciousness after drinking a clear unknown liquid. He was brought to the Emergency Departement (ED) after he was intubated. His partner notified the liquid...
Yousuke Fukui et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 785(1), 73-80 (2003-01-22)
A gas chromatographic-mass spectrometric (GC-MS) method is described for the determination of human plasma levels of gamma-butyrolactone (GBL) is described. The method is sensitive and simple. The plasma sample spiked with the internal standard was extracted by dichloromethane (CH(2)Cl(2)) in...
Mary Panijel et al.
Molecular plant-microbe interactions : MPMI, 26(9), 1031-1043 (2013-06-12)
Gall formation by Pantoea agglomerans pv. gypsophilae is dependent on the hypersensitive response and pathogenicity (hrp) system. Previous studies demonstrated that PagR and PagI, regulators of the quorum-sensing system, induce expression of the hrp regulatory cascade (i.e., hrpXY, hrpS, and...
Christian Westendorf et al.
Proceedings of the National Academy of Sciences of the United States of America, 110(10), 3853-3858 (2013-02-23)
The rapid reorganization of the actin cytoskeleton in response to external stimuli is an essential property of many motile eukaryotic cells. Here, we report evidence that the actin machinery of chemotactic Dictyostelium cells operates close to an oscillatory instability. When...
gamma-Butyrolactone.
IARC monographs on the evaluation of the carcinogenic risk of chemicals to man, 11, 231-239 (1976-01-01)
M Shannon et al.
Pediatric emergency care, 16(6), 435-440 (2001-01-04)
GHB, GBL, and 1,4-BD are prevalent drugs of abuse in the United States. Unfortunately, attempts to regulate GHB have been circumvented by clandestine trafficking through the Internet and marketing of "natural" chemical precursors . Despite repeated FDA warnings to the...
Frits van Griensven et al.
The lancet. HIV, 2(2), e64-e70 (2015-10-02)
HIV-1 incidence in men who have sex with men (MSM) is often difficult to estimate. We therefore assessed temporal trends in HIV-1 incidence and behavioural risk factors in MSM in Bangkok, Thailand, from 2006 to 2013. In this observational study...
Chao Wang et al.
Journal of bacteriology, 196(7), 1403-1411 (2014-01-28)
Quorum sensing (QS) is a widespread mechanism of bacterial communication in which individual cells produce and respond to small chemical signals. In Agrobacterium tumefaciens, an acylhomoserine lactone-dependent QS mechanism is known to regulate the replication and conjugation of the tumor-inducing...
Subrata Mahanta et al.
Chemphyschem : a European journal of chemical physics and physical chemistry, 16(8), 1657-1662 (2015-04-03)
In the present work, femtosecond transient absorption spectroscopy (fs-TAS) has been employed to investigate the electron injection efficiency (EIE) both from the singlet and triplet excited states of a well-known ruthenium dye (N719) to the conduction band (CB) of nanostructured...
Lianguo Chen et al.
Aquatic toxicology (Amsterdam, Netherlands), 157, 47-56 (2014-12-03)
SeaNine 211 with active ingredient of 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one (DCOIT) has been used as a "green" antifouling agent worldwide but has raised serious biosafety concerns in coastal environments. DCOIT has the potential to disrupt the neurotransmission in nervous system, but the underlying...
Dustin Tate Yeatman et al.
Journal of analytical toxicology, 27(1), 40-42 (2003-02-18)
In recent years, the use of gamma-hydroxybutyrate (GHB), as a recreational drug has prompted forensic toxicology laboratories to incorporate the analysis for GHB into their routine screening procedures. GHB, being a natural occurring constituent of the human body, presents a...
Paul J Marc et al.
Lab on a chip, 8(5), 710-716 (2008-04-25)
Electrically addressable cell traps were integrated with capillary electrophoresis for the analysis of the contents of single adherent cells. Electrodes composed of indium tin oxide were patterned on a glass surface followed by formation of topographical cell traps using 1002F...
Bo Xue et al.
Biochemistry, 52(13), 2359-2370 (2013-03-07)
The in vitro evolution and engineering of quorum-quenching lactonases with enhanced reactivities was achieved using a thermostable GKL enzyme as a template, yielding the E101G/R230C GKL mutant with increased catalytic activity and a broadened substrate range [Chow, J. Y., Xue...
Axel Bidon-Chanal et al.
European journal of medicinal chemistry, 60, 479-489 (2013-01-29)
Glycogen synthase kinase 3β (GSK-3β) is widely recognised as a relevant player in the pathogenesis of several highly prevalent disorders such as Alzheimer's disease, mood disorders, diabetes and cancer. Therefore, this enzyme constitutes a highly attractive therapeutic target for the...
Marina Kolomytseva et al.
Biochimica et biophysica acta, 1844(9), 1541-1549 (2014-04-29)
2-Chloromuconate cycloisomerase from the Gram-positive bacterium Rhodococcus opacus 1CP (Rho-2-CMCI) is an enzyme of a modified ortho-pathway, in which 2-chlorophenol is degraded using 3-chlorocatechol as the central intermediate. In general, the chloromuconate cycloisomerases catalyze not only the cycloisomerization, but also...
Leo J Schep et al.
Clinical toxicology (Philadelphia, Pa.), 50(6), 458-470 (2012-07-04)
Gamma-hydroxybutyrate (GHB) and its precursors, gamma-butyrolactone (GBL) and 1,4-butanediol (1,4-BD), are drugs of abuse which act primarily as central nervous system (CNS) depressants. In recent years, the rising recreational use of these drugs has led to an increasing burden upon...
Jong-Sik Jin et al.
Molecules (Basel, Switzerland), 18(1), 1122-1127 (2013-01-18)
Phytoestrogens are defined as plant-derived compounds with estrogen-like activities according to their chemical structures and activities. Plant lignans are generally categorized as phytoestrogens. It was reported that (-)-arctigenin, the aglycone of arctiin, was demethylated to (-)-dihydroxyenterolactone (DHENL) by Eubacterium (E.)...
Collin H Martin et al.
Nature communications, 4, 1414-1414 (2013-01-31)
The replacement of petroleum feedstocks with biomass to produce platform chemicals requires the development of appropriate conversion technologies. 3-Hydroxy-γ-butyrolactone has been identified as one such chemical; however, there are no naturally occurring biosynthetic pathways for this molecule or its hydrolyzed...
Huquan Gao et al.
Bioorganic & medicinal chemistry letters, 23(6), 1776-1778 (2013-02-16)
A new butenolide isoaspulvinone E (1), together with two known butenolides aspulvinone E (2) and pulvic acid (3) were isolated from the marine-derived fungus, Aspergillus terreus Gwq-48. They showed significant anti-influenza A H1N1 virus activities, with IC50 values of 32.3...
Zheng-Yuan Su et al.
Chemical research in toxicology, 26(3), 477-485 (2013-02-28)
Cancer development has been linked to epigenetic modifications of cancer oncogenes and tumor suppressor genes; in advanced metastatic cancers, severe epigenetic modifications are present. We previously demonstrated that the progression of prostate tumors in TRAMP mice is associated with methylation...
Huck K Grover et al.
Organic letters, 15(18), 4838-4841 (2013-09-07)
Exploration into the reactivity of donor-acceptor cyclopropane hemimalonates has led to the facile synthesis of γ-substituted butanolides. Under microwave irradiation, cyclopropane hemimalonates undergo rapid conversion to butanolides in the presence of inorganic salts with an unprecedented retention of stereochemistry. This...
Nisha Agrawal et al.
Chemistry & biodiversity, 10(3), 394-400 (2013-03-16)
Phytochemical investigations of a MeOH extract obtained from the heartwoods of the Litsea glutinosa (Lauraceae) led to the isolation and characterization of four new butenolides, (3R,4S,5S)-2-hexadecyl-3-hydroxy-4-methylbutanolide 1, litsealactone C (2), and litsealactone D (4), litsealactone G (5), and a new...
Xi Li et al.
Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica, 38(17), 2838-2843 (2014-01-02)
Bioactivity of Danggui is linked to the content of ligustilide, but the relationship between ligustilide with herb shape, cultivating areas and plant species is still unknown. The relationship was investigated by quantifying on the amounts of Z-ligustilide and E-ligustilide by...
David M Wood et al.
Drug testing and analysis, 3(7-8), 417-425 (2011-05-07)
Gamma-hydroxybutyrate (GHB) has been used as a recreational drug since the 1990s and over the last few years there has been increasing use of its analogues gamma-butyrolactone (GBL) and to a lesser extent 1,4-butanediol (1,4BD). This review will summarize the...

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