The existence of homoserine lactone in Pisum sativum seedlings is demonstrated. L-Homoserine lactone reacts with hydroxylamine, at neutral or alkaline pH, to form homoserine hydroxamic acid. Procedures are described for preparing L-homoserine lactone and L-homoserine hydroxamic acid. The hydroxa...

A series of 15 racemic alkyl- and aryl-N-substituted ureas, derived from homoserine lactone, were synthesized and tested for their ability to competitively inhibit the action of 3-oxohexanoyl-l-homoserine lactone, the natural inducer of bioluminescence in the bacterium Vibrio fischeri. N-alkyl u...

A series of 9 homoserine lactone-derived sulfonylureas substituted by an alkyl chain, some of them bearing a phenyl group at the extremity, have been prepared. All compounds were found to inhibit the action of 3-oxo-hexanoyl-l-homoserine lactone, the natural inducer of bioluminescence in the bac...

Publisher SummaryThe physiological function of O-acetylserine-O-acetylhomoserine sulfhydrylase of Saccharomyces cerevisiae is the biosynthesis of both cysteine and homocysteine. The products of these reactions, cysteine and homocysteine, are determined after removing sulfide at an acidic pH by r...

The application of zirconium phenyl phosphonate phosphite (ZrPP) as a solid acid catalyst for producing polyol esters by esterification of glycerol or trimethylolpropane with a fatty acid (C8–C18.1) is reported for the first time. ZrPP exhibits high catalytic activity and in particular, (di + t...

Functionalized carbohydrates and especially functionalized C-glycosides are useful intermediates for the synthesis of complex carbohydrates of interest. In this paper, we describe the synthesis of C-azidopropylglucopyranosides and give a full account of their regioselective acylation and alkylat...

The reaction of 3-C-dichloromethyl-1,2:5,6-di-O-isopropylidene-α-d-allo-hexofuranose, methyl 4,6-O-benzylidene-3-C-dichloromethyl-2-O-methyl-α-d-allopyranoside, methyl 2,3-di-O-benzyl-4-C- dichloromethyl-6-O-triphenylmethyl-α-d-galactopyranoside, and methyl 4-C-dichloromethyl-2,3-di-O-methyl-...

Crystal structures of a kind of cyclohexyl-cobaldioxime coenzyme B12 model compounds RCo(chgH)2L (R = CH3, C2H5 or C3H7, L = pyridine or H2O, chgH = 1,2-cyclohexanedione dioxime) at room and low temperatures have been determined. The results for C2H5Co(chgH)2py (1) indicate that its crystal unit...

High-performance liquid chromatography (HPLC) was used to determine the impurity profile of 1,2-cyclohexanedione dioxime (CDO), a key ingredient in the radiopharmaceutical CardioTec® kit (kit for the preparation of 99mTc teboroxime). The HPLC assay separated CDO from potential impurities which i...

The anti-listerial effectiveness of thyme essential oil (EO) and EO compounds camphor and verbenone was examined on fresh-cut lettuce, cantaloupe melon and pineapple with modified atmospheres and air in model packages at 4 and 8 °C. Listeria monocytogenes was found to be able to survive and gro...

Aqueous suspensions of Ru(0) nanoparticles, stabilized with hydroxyethylammonium salts and possessing sizes around 2 nm, proved to be active and selective in the mild oxidation of α-pinene in the presence of tert-butylhydroperoxide, in neat water. Verbenone, a product of great interest for fine...

Gut microbiota are widely involved in insect biology, and many factors can influence the microbiota in guts and frass. Dendroctonus valens is a very destructive forest pest in China, and the mass-attacking behavior is regulated by several semiochemicals, including verbenone, a multifunctional ph...

As the first step of a two-part chiral tagging experiment, the spectrum and subsequent isotopologue analysis on the heavy atoms of (1S)-(-)-Verbenone is presented. The spectrum has been recorded up to 69 GHz on three spectrometers, one CP-FTMW spectrometer from the University of Virginia functio...

Fungal volatile compounds can mediate fungal-insect interactions. Whether fungi can emit insect pheromones and how volatile chemicals change in response to chemicals the fungi naturally encounter is poorly understood. We analyzed volatiles emitted by Grosmannia clavigera (symbiont of the mountai...

The whole cell biological conversion of naphthalene to (+)-cis-(1R,2S)-dihydroxy-1,2-dihydronaphthalene by the E. coli JM109(pPS1778) recombinant strain carrying the naphthalene dioxygenase and regulatory genes cloned from Pseudomonas fluorescens N3 in micellar systems has been investigated usin...

Herein, the CoB catalyst supported on the sepiolite clay treated with phosphoric acid was utilized to produce hydrogen from the NaBH4 hydrolysis. In order to analyse the performance of the phosphoric acid treated sepiolite clay supported-CoB catalyst, the NaBH4 concentration effect, phosphoric a...

In this study, with sepiolite as a support, a novel magnetic Fe3O4-sepiolite composite was fabricated by coprecipitation method. The characterization results reveal that the sepiolite support could anchor Fe3O4 nanoparticles with good dispersion. The composite was used as a catalyst to activate ...

A self-organization of sepiolite fibbers have been found during the synthesis of sustainable nanocomposites. These auto-structured networks are synthesized starting with an epoxidized linseed oil (ELO), a bio-based hardener of dicarboxylic class and sepiolite fibbers. For the first time, the aut...

Sepiolite is one of the few Mg-phyllosilicates thought to precipitate at Earth’s near-surface conditions, and in hydrothermal systems. Understanding the dissolution mechanisms of sepiolite can elucidate Mg-silicate dissolution processes in general and can provide a better estimation of the avai...

Poly(ε-caprolactone) (PCL) based nanocomposites with unmodified and organomodified sepiolites were prepared by solution casting method. The sepiolites were modified with short (3-mercaptopropyl)trimethoxysilane (SEP-SI) by using covalent grafting or with long hexadecylamine (SEP-HDA) by using i...