Search results for "Gamma"

Toxicity of gamma-decalactone and 4-hydroxydecanoic towards two species of sporidiobolus

1995

National audience

Production de gamma-decalactone par bioconversion

1993

Diversity and complexity of microbial communities from a chlor-alkali tailings dump

2015

Abstract Revegetation of the tailings dumps produced by various industrial activities is necessary to prevent dust storms and erosion and represents a great challenge for ecological restoration. Little is known about the microbial colonisation and community structure of revegetated tailings following site exploitation. Here, we report the sequencing of 16S rRNA and internal transcribed spacer (ITS) fungal RNA gene amplicons from chlor-alkali residue and from an adjacent undisturbed soil to define the composition and assembly of the rhizosphere microbial communities. After quality filtering, a total of 72,373 and 89,929 bacterial sequences and 122,618 and 111,209 fungal sequences remained fo…

Qualitative and quantitative study of the mixture of two odorous compounds of wine

2003

National audience

Measurement of 210Pb airborne activity concentration by gamma-ray spectrometry of air particulate samplings

2009

Lead-210 (half-life 22.3 y), is a natural radionuclide, being produced in the atmosphere through radon decay. Due to its affinity for particles, it is rapidly fixed by aerosols and, with its long half-life is the most important tracer of long range atmospheric aerosol transport and removal processes. Main measurement techniques adopted to evaluate 210Pb air activity concentration differ in analysis and sample preparation methods. Some of them involved complex chemical processes or decay product detection (for example 210Po), with a long decay time period between sampling and experimental measurement. The availability of an high-volume particulate sampler (about 900 m3 h-1) combined with a l…

Biochemical and structural features of a novel cyclodextrinase from cow rumen metagenome.

2007

A novel enzyme, RA.04, belonging to the alpha-amylase family was obtained after expression of metagenomic DNA from rumen fluid (Ferrer et al.: Environ. Microbiol. 2005, 7, 1996-2010). The purified RA.04 has a tetrameric structure (280 kDa) and exhibited maximum activity (5000 U/mg protein) at 70 degrees C and was active within an unusually broad pH range from 5.5 to 9.0. It maintained 80% activity at pH 5.0 and 9.5 and 75 degrees C. The enzyme hydrolyzed alpha-D-(1,4) bonds 13-fold faster than alpha-D-(1,6) bonds to yield maltose and glucose as the main products, and it exhibited transglycosylation activity. Its preferred substrates, in the descending order, were maltooligosaccharides (C3-C…

Bruton tyrosine kinase-like protein, BtkSD, is present in the marine sponge Suberites domuncula.

2003

Sponges, the simplest and most ancient phylum of Metazoa, encode in their genome complex and highly sophisticated proteins that evolved together with multicellularity and are found only in metazoan animals. We report here the finding of a Bruton tyrosine kinase (BTK)-like protein in the marine sponge Suberites domuncula (Demospongiae). The nucleotide sequence of one sponge cDNA predicts a 700-aa-long protein, which contains all of the characteristic domains for the Tec family of protein tyrosine kinases (PTKs). The highest homology (38% identity, 55% overall similarity) was found with human BTK and TEC PTKs. Sponge PTK was therefore named BtkSD. Human BTK is involved in the maturation of B …

Determinación de anticuerpos anti-Anisakis y relación con las subpoblaciones linfocitarias αβ Y γδ en pacientes con Enfermedad de Crohn

2015

La enfermedad de Crohn (EC) es una enfermedad de etiopatogenia y fisiopatología compleja, que se desarrolla sobre una base de múltiples alteraciones inmunes, tanto de la inmunidad innata como de la inmunidad adquirida. Siguiendo nuestra línea de investigación en relación a la deficiencia de LTγδ en pacientes con enfermedad de Crohn, planteamos la hipótesis de trabajo de que parásitos como Anisakis simplex, ingerido frecuentemente mediante el consumo de pescado, podrían aprovechar este estado de inmunidad alterada en la enfermedad de Crohn para infectar con mayor frecuencia a estos pacientes que a la población sana. Hemos realizado un estudio prospectivo de casos y controles desde junio de 2…

Borexino’s search for low-energy neutrino and antineutrino signals correlated with gamma-ray bursts

2017

International audience; A search for neutrino and antineutrino events correlated with 2350 gamma-ray bursts (GRBs) is performed with Borexino data collected between December 2007 and November 2015. No statistically significant excess over background is observed. We look for electron antineutrinos ( ν¯e ) that inverse beta decay on protons with energies from 1.8  MeV to 15  MeV and set the best limit on the neutrino fluence from GRBs below 8  MeV. The signals from neutrinos and antineutrinos from GRBs that scatter on electrons are also searched for, a detection channel made possible by the particularly radio-pure scintillator of Borexino. We obtain currently the best limits on the neutrino f…

Antioxidative and Photo-Induced Effects of Different Types of N-Doped Graphene Quantum Dots.

2022

Due to the increasing number of bacterial infections and the development of resistivity toward antibiotics, new materials and approaches for treatments must be urgently developed. The production of new materials should be ecologically friendly considering overall pollution with chemicals and economically acceptable and accessible to the wide population. Thus, the possibility of using biocompatible graphene quantum dots (GQDs) as an agent in photodynamic therapy was studied. First, dots were obtained using electrochemical cutting of graphite. In only one synthetic step using gamma irradiation, GQDs were doped with N atoms without any reagent. Obtained dots showed blue photoluminescence, with…