839 research outputs found
El sector conservero y semiconservero de pescados y de mariscos: claves de futuro
Texto dispoñible en galego e españolS
Overexpression of canonical prefoldin associates with the risk of mortality and metastasis in non-small cell lung cancer
Canonical prefoldin is a protein cochaperone composed of six di erent subunits (PFDN1
to 6). PFDN1 overexpression promotes epithelialâmesenchymal transition (EMT) and increases the growth of xenograft lung cancer (LC) cell lines. We investigated whether this putative involvement of canonical PFDN in LC translates into the clinic. First, the mRNA expression of 518 non-small cell LC (NSCLC) cases from The Cancer Genome Atlas (TCGA) database was evaluated. Patients with PFDN1 overexpression had lower overall survival (OS; 45 vs. 86 months; p = 0.034). We then assessed the impact of PFDN expression on outcome in 58 NSCLC patients with available tumor tissue samples.
PFDN1, 3, and 5 overexpression were found in 38% (n = 22), 53% (n = 31), and 41% (n = 24) of tumor samples. PFDN1, 3, and 5 overexpression were significantly associated with lower OS, lower disease-free survival (DFS), and lower distant metastasis-free survival (DMFS) for PFDN1 and 3 with a trend for PFDN5. In multivariate analysis, PFDN5 retained significance for OS (hazard ratio (HR) 2.56; p = 0.007) and PFDN1 for DFS (HR 2.53; p = 0.010) and marginally for DMFS (HR 2.32; p = 0.053).
Our results indicate that protein response markers, such as PFDN1, 3, and 5, may complement mRNA signatures and be useful for determining the most appropriate therapy for NSCLC patients
Brain atrophy and clinical characterization of adults with mild cognitive impairment and different cerebrospinal fluid biomarker profiles according to the AT(N) research framework of Alzheimerâs disease
Introduction: This study aimed to evaluate, in adults with mild cognitive impairment (MCI), the brain atrophy that may distinguish between three AT(N) biomarker-based profiles, and to determine its clinical value.
Methods: Structural MRI (sMRI) was employed to evaluate the volume and cortical thickness differences in MCI patients with different AT(N) profiles, namely, AâTâ(N)â: normal AD biomarkers; A+Tâ(N)â: AD pathologic change; and A+T+(N)+: prodromal AD. Sensitivity and specificity of these changes were also estimated.
Results: An initial atrophy in medial temporal lobe (MTL) areas was found in the A+Tâ(N)â and A+T+(N)+ groups, spreading toward the parietal and frontal regions in A+T+(N)+ patients. These structural changes allowed distinguishing AT(N) profiles within the AD continuum; however, the profiles and their pattern of neurodegeneration were unsuccessful to determine the current clinical status.
Conclusion: sMRI is useful in the determination of the specific brain structural changes of AT(N) profiles along the AD continuum, allowing differentiation between MCI adults with or without pathological AD biomarkersThis study was supported by grants from the Spanish
Government, Ministerio de Ciencia e InnovaciĂłn (PSI2017-
89389-C2-R and PID2020-114521RB-C21/C22); the
Galician Government, Axudas para a ConsolidaciĂłn e
EstruturaciĂłn de Unidades de InvestigaciĂłn Competitivas
do Sistema Universitario de Galicia: GRC (GI-1807-
USC); Refs: ED431-2017/27 and ED431C-2021/04; all with
ERDF/FEDER fundsS
Measurement of forward Z â e+eâ production sâs=8 TeV
A measurement of the cross-section for Z-boson production in the forward region of pp collisions at 8 TeV centre-of-mass energy is presented. The measurement is based on a sample of Z â e+eâ decays reconstructed using the LHCb detector, corresponding to an integrated luminosity of 2.0 fbâ1. The acceptance is defined by the requirements 2.0 20 GeV for the pseudorapidities and transverse momenta of the leptons. Their invariant mass is required to lie in the range 60-120 GeV. The cross-section is determined to beS
Measurement of indirect CP asymmetries in D0 â KâK+ and D0 â ÏâÏ+ decays using semileptonic B decays
Time-dependent CP asymmetries in the decay rates of the singly Cabibbo-suppressed decays D0 â KâK+ and D0 â ÏâÏ+ are measured in pp collision data corresponding to an integrated luminosity of 3.0 fbâ1 collected by the LHCb experiment. The D0 mesons are produced in semileptonic b-hadron decays, where the charge of the accompanying muon is used to determine the initial state as D0 or DÂŻ0. The asymmetries in effective lifetimes between D0 and DÂŻ0 decays, which are sensitive to indirect CP violation, are determined to be
AÎ(KâK+)=(â0.134±0.077â0.026â0.034)%,AÎ(ÏâÏ+)=(â0.092±0.145â0.025â0.033)%,
where the first uncertainties are statistical and the second systematic. This result is in agreement with previous measurements and with the hypothesis of no indirect CP violation in D0 decays.S
Precise measurements of the properties of the B1(5721)0,+ and B *2(5747)0,+ states and observation of B+,0Ïâ,+ mass structures
Invariant mass distributions of B+Ïâ and B0Ï+ combinations are investigated in order to study excited B mesons. The analysis is based on a data sample corresponding to 3.0 fbâ1 of pp collision data, recorded by the LHCb detector at centre-of-mass energies of 7 and 8 TeV. Precise measurements of the masses and widths of the B1(5721)0,+ and B2(5747)0,+ states are reported. Clear enhancements, particularly prominent at high pion transverse momentum, are seen over background in the mass range 5850-6000 MeV in both B+Ïâ and B0Ï+ combinations. The structures are consistent with the presence of four excited B mesons, labelled B J (5840)0,+ and B J (5960)0,+, whose masses and widths are obtained under different hypotheses for their quantum numbersS
Measurement of CP asymmetries and polarisation fractions in B0sâKâ0KÂŻâ0 decays
An angular analysis of the decay B0sâKâ0KÂŻâ0 is performed using pp collisions corresponding to an integrated luminosity of 1.0 fbâ1 collected by the LHCb experiment at a centre-of-mass energy sâ=7 TeV. A combined angular and mass analysis separates six helicity amplitudes and allows the measurement of the longitudinal polarisation fraction f L = 0.201 ± 0.057 (stat.) ± 0.040 (syst.) for the B0sâKâ(892)0KÂŻâ(892)0 decay. A large scalar contribution from the K â0(1430) and K â0(800) resonances is found, allowing the determination of additional CP asymmetries. Triple product and direct CP asymmetries are determined to be compatible with the Standard Model expectations. The branching fraction B(BsâKâ(892)0KÂŻâ(892)0) is measured to be (10.8 ± 2.1 (stat.) ± 1.4 (syst.) ± 0.6 (f d /f s )) Ă 10â6.S
Observation of the B0âÏ0Ï0 decay from an amplitude analysis of B0â(Ï+Ïâ)(Ï+Ïâ)decays
Protonâproton collision data recorded in 2011 and 2012 by the LHCb experiment, corresponding to an integrated luminosity of 3.0fbâ1, are analysed to search for the charmless B0âÏ0Ï0decay. More than 600 B0â(Ï+Ïâ)(Ï+Ïâ)signal decays are selected and used to perform an amplitude analysis, under the assumption of no CP violation in the decay, from which the B0âÏ0Ï0decay is observed for the first time with 7.1 standard deviations significance. The fraction of B0âÏ0Ï0decays yielding a longitudinally polarised final state is measured to be fL=0.745+0.048â0.058(stat) ±0.034(syst). The B0âÏ0Ï0branching fraction, using the B0âÏKâ(892)0decay as reference, is also reported as B(B0âÏ0Ï0)=(0.94±0.17(stat)±0.09(syst)±0.06(BF))Ă10â6S
Study of the rare B0s and B0s decays into the Ï+ÏâÎŒ+ÎŒâfinal state
A search for the rare decays B0sâÏ+ÏâÎŒ+ÎŒâand B0âÏ+ÏâÎŒ+ÎŒâis performed in a data set corresponding to an integrated luminosity of 3.0fbâ1collected by the LHCb detector in protonâproton collisions at centre-of-mass energies of 7 and 8TeV. Decay candidates with pion pairs that have invariant mass in the range 0.5â1.3GeV/c2and with muon pairs that do not originate from a resonance are considered. The first observation of the decay B0sâÏ+ÏâÎŒ+ÎŒâand the first evidence of the decay B0âÏ+ÏâÎŒ+ÎŒâare obtained and the branching fractions, restricted to the dipion-mass range considered, are measured to be B(B0sâÏ+ÏâÎŒ+ÎŒâ) =(8.6 ±1.5(stat) ±0.7(syst) ±0.7 (norm)) Ă10â8and B(B0âÏ+ÏâÎŒ+ÎŒâ) =(2.11±0.51(stat)±0.15(syst)±0.16(norm))Ă10â8, where the third uncertainty is due to the branching fraction of the decay B0âJ/Ï(âÎŒ+ÎŒâ)Kâ(892)0(âK+Ïâ), used as a normalisation.S
Measurement of the CP-violating phase ÎČin B0âJ/ÏÏ+Ïâdecays and limits on penguin effects
Time-dependent CPviolation is measured in the (â)B0âJ/ÏÏ+Ïâchannel for each Ï+Ïâresonant final state using data collected with an integrated luminosity of 3.0fbâ1in ppcollisions using the LHCb detector. The final state with the largest rate, J/ÏÏ0(770), is used to measure the CP-violating angle 2ÎČeffto be (41.7 ±9.6+2.8â6.3)âŠ.This result can be used to limit the size of penguin amplitude contributions to CPviolation measurements in, for example, (â)B0sâJ/ÏÏdecays. Assuming approximate SU(3) flavour symmetry and neglecting higher order diagrams, the shift in the CP-violating phase Ïsis limited to be within the interval [â1.05âŠ, +1.18âŠ] at 95% confidence level. Changes to the limit due to SU(3) symmetry breaking effects are also discussed.S
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