Search results for "N2"

Procédé de réduction du gaz à effet de serre N2O en N2 par des couples symbiotiques légumineus-rghizobia, sélectionnés conjointement pour application…

2009

Effects of ectopic expression of NGAL on doxorubicin sensitivity.

2012

Neutrophil gelatinase-associated lipocalin (NGAL, a.k.a Lnc2) is a member of the lipocalin family which has diverse roles including stabilizing matrix metalloproteinase-9 from auto-degradation and as siderocalins which are important in the transport of iron. NGAL also has important biological functions involved in immunity and inflammation as well as responses to kidney damage. NGAL expression has also been associated with certain neoplasia and is important in the metastasis of breast cancer. Many advanced cancer patients have elevated levels of NGAL in their urine and it has been proposed that NGAL may be a prognostic indicator for certain cancers (e.g. breast, brain, and others). NGAL exp…

Electronic Structures and Molecular Properties of Chalcogen Nitrides Se2N2 and SeSN2

2006

The electronic structures and molecular properties of S2N2 as well as the currently unknown chalcogen nitrides Se2N2 and SeSN2 have been studied using various ab initio and density functional methods. All molecules share a qualitatively similar electronic structure and can be primarily described as 2π-electron aromatics having minor singlet diradical character of 6−8% that can be attributed solely to the nitrogen atoms. This diradical character is manifested in the prediction of their molecular properties, in which coupled cluster and multiconfigurational approaches, as well as density functional methods, show the best performance. The conventional ab initio methods RHF and MP2 completely f…

Computational prediction of the Helitron-N2 (HeN2) transposable element in the strim1 locus of the Paracentrotus lividus genome

2011

Transposons constitute a significant component of the eukaryotic genome. Among others, Helitrons represent a novel major class of eukaryotic transposons, and are fundamentally different from classical ones in terms of their structure and mechanism of transposition [1]. In particular, Helitrons constitute ~1% of the sea urchin genome [2]. By a in silico approach focused on the genome of the Mediterranean sea urchin Paracentrotus lividus, we have predicted regions of high sequence identity to a Helitron-N2 (HeN2) element in the strim1 locus. Of interest, HeN2 sequences lies within the 5’ non coding region of the strim1a and strim1b genes, spanning from -105 to -2255 (the start codon ATG of st…

In-depth characterization of denitrifier communities across different soil ecosystems in the tundra

2022

Abstract Background In contrast to earlier assumptions, there is now mounting evidence for the role of tundra soils as important sources of the greenhouse gas nitrous oxide (N2O). However, the microorganisms involved in the cycling of N2O in this system remain largely uncharacterized. Since tundra soils are variable sources and sinks of N2O, we aimed at investigating differences in community structure across different soil ecosystems in the tundra. Results We analysed 1.4 Tb of metagenomic data from soils in northern Finland covering a range of ecosystems from dry upland soils to water-logged fens and obtained 796 manually binned and curated metagenome-assembled genomes (MAGs). We then sear…

Etude théorique de surfaces d'énergie potentielle, de moment dipolaire et de polarizabilité des complexes de van der Waals CH4-N2 et C2H4-C2H4

2010

In the present thesis both ab initio and analytical calculations were carried out for thepotential energy, dipole moment and polarizability surfaces of the weakly bound van der Waals complexes CH4-N2 and C2H4-C2H4 for a broad range of intermolecular separations and configurations in the approximation of the rigid interacting molecules. For ab initio calculations the CCSD(T), CCSD(T)-F12 and less computationally expensive methods such as MP2, MP2-F12, SAPT, DFT-SAPT were employed (for all methods the aug-cc-pVTZ basis set was used). The BSSE correction was taken into account during the calculations. The analytical calculations were performed in the framework of the classical long-range appro…