Search results for "iNOS"
showing 10 items of 2075 documents
Nucleoside uptake in male germ cells of the polychaeteNereis virens
1997
Summary Uptake of inosine and guanosine was measured in male germ ceils of the polychaete Nereis virens at different stages of development. In spermatogonia I (spg I) and spermatid stages, total inosine uptake at 12°C and ambient concentrations of 100 μmol/1 was relatively low (10–50 nmol·ml of packed cell volume pcv−l·h−1). A rapid increase (150–300 nmol·ml of pcv-1·h−1) was found during transition from spg I to spg II with a subsequent decline to low values (10–30 nmol·ml of pcv−1·h−1) in spermatocyte and spermatid stages. This transient increase may be related to the proliferative activity of spg I stages leading to spg II stages, which increases the demand of purine precursors for nucle…
Metabolite supply in oocytes of Nereis virens: role of nucleosides
1999
Gamete development in Nereis virens and other nereidid polychaetes is organized in a simple way. Follicular tissues are absent and the germ cells develop floating freely in the coelomic fluid, which thus serves as the vehicle for the supply of substances required for oocyte growth. This overview focusses on the role of exogenous purine nucleosides for the growing oocytes. Eleocytes, a coelomic cell type which is proliferated in large amounts at the beginning of sexual maturation, supply purine nucleosides to support nucleic acid synthesis in the oocytes. Eleocytes can store large amounts of purine nucleotides (up to 50 µ mol ml−1 cell vol.) in the form of AMP and ADP. During oogenesis, thes…
Uptake and Metabolism of Purine Nucleosides and Purine Nucleoside Analogues by Cells
1979
Since the discovery of purine nucleotides and purine nucleosides, 1847 by Liebig (1) (inosinic acid) and 1885 by Schulze et al. (2) (guanosine),it was only relatively recently that purine- and purine-nucleoside analogues have been considered to be effective antitumor or antiviral agents. It is due to Prusoff, Schabel and S.S. Cohen that on the other hand pyrimidine nucleoside analogues have already been used clinically as drugs for a number of years.
Syntheses, Mössbauer and infrared spectroscopic investigations on tin(II) chloride adducts with purine and pyrimidine bases and nucleosides
1982
Abstract The synthesis of two types of tin(II) complex SnCl2·L·CH3OH (L = adenosine, cytidine and inosine) and SnCl2·L2·CH3OH (L = adenine and cytosine) are described. The complexes are characterised by their infrared and 119Sn Mossbauer data. The Mossbauer shift data suggest that the bonds between tin(II) chloride and the donor atoms of the ligands are relatively weak.
The ALHAMBRA survey: Discovery of a faint QSO at z = 5.41
2013
[Aims]: We aim to illustrate the potentiality of the Advanced Large, Homogeneous Area, Medium-Band Redshift Astronomical (ALHAMBRA) survey to investigate the high-redshift universe through the detection of quasi stellar objects (QSOs) at redshifts higher than 5. [Methods]: We searched for QSOs candidates at high redshift by fitting an extensive library of spectral energy distributions-including active and non-active galaxy templates, as well as stars-to the photometric database of the ALHAMBRA survey (composed of 20 optical medium-band plus the 3 broad-band JHKs near-infrared filters). [Results]: Our selection over ≈1 square degree of ALHAMBRA data (∼1/4 of the total area covered by the sur…
Simultaneous measurements of thett¯,W+W−, andZ/γ*→ττproduction cross-sections inppcollisions ats=7 TeVwith the ATLAS detector
2015
Simultaneous measurements of the t (t) over bar, W+W-, and Z/gamma* -> tau tau production cross-sections using an integrated luminosity of 4.6 fb(-1) of pp collisions at root s = 7 TeV collected ...
Measurement of the differential cross-sections of inclusive, prompt and non-prompt J/ψ production in proton–proton collisions at s=7 TeV
2011
The inclusive J/psi production cross-section and fraction of J/psi mesons produced in B-hadron decays are measured in proton proton collisions at root s = 7 TeV with the ATLAS detector at the LHC, as a function of the transverse momentum and rapidity of the J/psi, using 2.3 pb(-1) of integrated luminosity. The cross-section is measured from a minimum P-T of 1 GeV to a maximum of 70 GeV and for rapidities within vertical bar y vertical bar < 2.4 giving the widest reach of any measurement of J/psi production to date. The differential production cross-sections of prompt and non-prompt J/psi are separately determined and are compared to Colour Singlet NNLO*, Colour Evaporation Model, and FONLL …
Measurement of the ratios of the Z/γ∗+⩾n jet production cross sections to the total inclusive Z/γ∗ cross section in pp¯ collisions at s=1.96 TeV
2008
We present a study of events with Z bosons and jets produced at the Fermilab Tevatron Collider in ppbar collisions at a center of mass energy of 1.96 TeV. The data sample consists of nearly 14,000 Z/G* -> e+e- candidates corresponding to the integrated luminosity of 340 pb-1 collected using the D0 detector. Ratios of the Z/G* + >= n jet cross sections to the total inclusive Z/G* cross section have been measured for n = 1 to 4 jet events. Our measurements are found to be in good agreement with a next-to-leading order QCD calculation and with a tree-level QCD prediction with parton shower simulation and hadronization.
Measurements of differential cross sections of Z/γ∗+jets+X events in pp¯ collisions at s=1.96 TeV
2009
We present cross section measurements for Z/gamma* + jets + X production, differential in the transverse momenta of the three leading jets. The data sample was collected with the DO detector at the Fermilab Tevatron p (p) over bar collider at a center-of-mass energy of 1.96 TeV and corresponds to an integrated luminosity of 1 fb(-1). Leading and next-to-leading order perturbative QCD predictions are compared with the measurements. and agreement is found within the theoretical and experimental uncertainties. We also make comparisons with the predictions of four event generators. Two parton-shower-based generators show significant shape and normalization differences with respect to the data. …
Measurement of the ratio of three-jet to two-jet cross sections in pp¯ collisions at s=1.96 TeV
2013
We present a measurement of the ratio of multijet cross sections in pp-bar collisions at sqrt(s) = 1.96 TeV at the Fermilab Tevatron Collider. The measurement is based on a data set corresponding to an integrated luminosity of 0.7 fb-1 collected with the D0 detector. The ratio of the inclusive three-jet to two-jet cross sections, R3/2, has been measured as a function of the jet transverse momenta. The data are compared to QCD predictions in different approximations. Popular tunes of the PYTHIA event generator do not agree with the data, while SHERPA provides a reasonable description of the data. A perturbative QCD prediction in next-to-leading order in the strong coupling constant, correcte…