Avanços recentes em nutrição de larvas de peixes

Os requisitos nutricionais de larvas de peixes são ainda mal compreendidos, o que leva a altas mortalidades e problemas de qualidade no seu cultivo. Este trabalho pretende fazer uma revisão de novas metodologias de investigação, tais como estudos com marcadores, genómica populacional, programação nutricional, génomica e proteómica funcionais, e fornecer ainda alguns exemplos das utilizações presentes e perspectivas futuras em estudos de nutrição de larvas de peixes

Novel Loci for Adiponectin Levels and Their Influence on Type 2 Diabetes and Metabolic Traits : A Multi-Ethnic Meta-Analysis of 45,891 Individuals

J. Kaprio, S. Ripatti ja M.-L. Lokki työryhmien jäseniä.Peer reviewe

Helium identification with LHCb

The identification of helium nuclei at LHCb is achieved using a method based on measurements of ionisation losses in the silicon sensors and timing measurements in the Outer Tracker drift tubes. The background from photon conversions is reduced using the RICH detectors and an isolation requirement. The method is developed using pp collision data at √(s) = 13 TeV recorded by the LHCb experiment in the years 2016 to 2018, corresponding to an integrated luminosity of 5.5 fb-1. A total of around 105 helium and antihelium candidates are identified with negligible background contamination. The helium identification efficiency is estimated to be approximately 50% with a corresponding background rejection rate of up to O(10^12). These results demonstrate the feasibility of a rich programme of measurements of QCD and astrophysics interest involving light nuclei

Momentum scale calibration of the LHCb spectrometer

For accurate determination of particle masses accurate knowledge of the momentum scale of the detectors is crucial. The procedure used to calibrate the momentum scale of the LHCb spectrometer is described and illustrated using the performance obtained with an integrated luminosity of 1.6 fb-1 collected during 2016 in pp running. The procedure uses large samples of J/ψ → μ + μ - and B+ → J/ψ K + decays and leads to a relative accuracy of 3 × 10-4 on the momentum scale

Curvature-bias corrections using a pseudomass method

Momentum measurements for very high momentum charged particles, such as muons from electroweak vector boson decays, are particularly susceptible to charge-dependent curvature biases that arise from misalignments of tracking detectors. Low momentum charged particles used in alignment procedures have limited sensitivity to coherent displacements of such detectors, and therefore are unable to fully constrain these misalignments to the precision necessary for studies of electroweak physics. Additional approaches are therefore required to understand and correct for these effects. In this paper the curvature biases present at the LHCb detector are studied using the pseudomass method in proton-proton collision data recorded at centre of mass energy √(s)=13 TeV during 2016, 2017 and 2018. The biases are determined using Z→μ + μ - decays in intervals defined by the data-taking period, magnet polarity and muon direction. Correcting for these biases, which are typically at the 10-4 GeV-1 level, improves the Z→μ + μ - mass resolution by roughly 18% and eliminates several pathological trends in the kinematic-dependence of the mean dimuon invariant mass

Insecticides. Part 8. Crystal structures of 1,1-bis-(p-chlorophenyl)-acetic acid (DDA) and 4,4′-dichlorobenzophenone (DBP)

The crystal structure of DDA has been determined by direct methods from three-dimensional diffractometer data. Z = 4 in the monoclinic unit cell, space group P21/c, a = 1 411.3(2), b = 612.3(1), c = 1 600.5(2) pm. β = 111.51 (1)°. The structure was refined by least squares to R 0.079 for 1 600 observed reflections. DDA is nonactive but has conformational angles similar to those of DDT. It forms a dimer, with its centre at a centre of symmetry, and a hydrogen bond of 200 pm. The structure of 4,4′-dichlorobenzophenone (DBP) was determined by the same methods. Z = 4 in the monoclinic cell, space group C2/c, a = 2 516.1 (11), b = 612.8(3), c = 758.6(3) pm, β = 102.05(3)°. The molecule has a space-group implied two-fold axis. It is non-active and has small conformational angles like those of DDE

Insecticides. XI. Crystal structure of endosulfan, β-6, 7, 8, 9, 10, 10-Hexachloro-1, 5, 5a, 6, 9, 9a-hexahydro-endo-6, 9-methano-2, 4, 3-benzodioxathiepin 3-Oxide

The crystal structure of hexagonal β-endosulfan (β) was determined by direct methods. On a four-circle diffractometer, 2350 reflections were collected. The crystals were hexagonal, (P6/m), with Z = 6, in a cell of dimensions a = 1492.0(2), c = 1150.6(2) pm. The structure was refined by least squares to R 0.068 from 573 unique reflections having F > 2.5σ(F). The methylene sulphite ring showed an ‘endo-endo-endo’ configuration with respect to its attachment to the methano-bridged hexachlorocyclohexane and exo to the oxide portion of the sulphite group. Space group requirements for P6/m resulted in the molecules lying along the mirror planes at Z = 1/4 and 3/4