Missing mass spectroscopy with the $(e,e^{\prime}K^{+})$ reaction was performed at JLab Hall C for the neutron rich $\Lambda$ hypernucleus $^{9}_{\Lambda}{\rm Li}$. The ground state energy was ...obtained to be $B_{\Lambda}^{\rm g.s.}=8.84\pm0.17^{\rm stat.}\pm0.15^{\rm sys.}~{\rm MeV}$ by using shell model calculations of a cross section ratio and an energy separation of the spin doublet states ($3/2^{+}_1$ and $5/2^{+}_1$). In addition, peaks that are considered to be states of $^{8}{\rm Li}(3^{+})\otimes s_{\Lambda}=3/2^{+}_{2}, 1/2^{+}$ and $^{8}{\rm Li}(1^{+})\otimes s_{\Lambda}=5/2^{+}_{2}, 7/2^{+}$ were observed at $E_{\Lambda}(\#2)=1.74\pm0.27^{\rm stat.}\pm0.11^{\rm sys.}~{\rm MeV}$ and $E_{\Lambda}(\#3)=3.30\pm0.24^{\rm stat.}\pm0.11^{\rm sys.}~{\rm MeV}$, respectively. The $E_{\Lambda}(\#3)$ is larger than shell model predictions by a few hundred keV, and the difference would indicate that a ${\rm ^{5}He}+t$ structure is more developed for the $3^{+}$ state than those for the $2^{+}$ and $1^{+}$ states in a core nucleus $^{8}{\rm Li}$ as a cluster model calculation suggests.
We have measured parity-violating asymmetries in elastic electron-proton and quasielastic electron-deuteron scattering at Q2=0.22 and 0.63 GeV2. They are sensitive to strange quark contributions to ...currents in the nucleon and the nucleon axial-vector current. The results indicate strange quark contributions of approximately < 10% of the charge and magnetic nucleon form factors at these four-momentum transfers. We also present the first measurement of anapole moment effects in the axial-vector current at these four-momentum transfers.
Abstract
Disclosure: P. Kempegowda: None. K. Malhotra: None. H. Khalil: None. M. Davitadze: None. C. Tay: None. A. Mousa: None. P. Team: None. H.J. Teede: None. L. Brennan: None. E. Stener-Victorin: ...None.
Background: While several studies have established the increased prevalence of depression and anxiety among those with polycystic ovary syndrome (PCOS), the association between PCOS and body image remains unclear. These body image concerns can lead to Body Dysmorphic Disorder (a mental health condition where a person spends a lot of time worrying about flaws in their appearance) and/or also predispose to eating disorders such as anorexia or bulimia. Objective: To assess differences in body image concerns among women and individuals with and without PCOS in the context of updating International Guidelines in PCOS. Methods: A systematic review and meta-analysis was completed with a registered protocol a priori on the National Institute of Health Research Prospective Register of Systematic Reviews PROSPERO (CRD42021272367). Electronic databases (MEDLINE, EMBASE, APA PsycInfo, PUBMED, Web-of-Science Core Collection, and CENTRAL) were searched through July 2022. Outcome measures included validated questionnaires reporting on body dysmorphic disorders. Methodological quality was assessed by GRADE (Grading of Recommendations, Assessment, Development and Evaluations) system. Meta-analyses were performed using the inverse variance method, based on random- or fixed-effects models (Review Manager, Version 5). For dichotomous outcomes, we estimated odds ratios (OR) with 95% confidence intervals (CI) using fixed-effects models. For continuous outcomes, we estimated the weighted mean difference in scores with 95% confidence interval if the mean and SD of the outcomes were presented in the original article. Results: A total of 918 women with PCOS and 865 women without PCOS from nine studies were included, with sample sizes ranging from 33 to 201 for those with PCOS and from 22 to 225 for those without PCOS. Meta-analysis of three studies using Multidimensional Body-Self Relations Questionnaire Appearance Scales (MBSRQ-AS) showed those with PCOS reported worse on appearance evaluation and appearance orientation compared to those without PCOS (MD= -0.78, I2=0%, p<0.00001 and MD= 0.22, I2=54%, p=0.004, respectively). Meta-analysis of two studies showed higher overweight preoccupation, body areas satisfaction, and body weight classification on MBSRQ-AS subscales in those with PCOS compared to those without (all p<0.001). Meta-analysis of two studies using Body Esteem Scale for Adolescents and Adults (BESAA) showed significantly lower scores for the weight subscale in those with PCOS, compared to those without, whereas differences in the BESAA appearance and attribution subscales were not statistically significant between the two groups (p=0.03 vs p=0.73 and p=0.36, respectively).
Conclusion: Those with PCOS experience greater body image concerns emphasising importance of awareness in clinical care of PCOS. Further studies are needed to identify drivers and mitigating factors.
Presentation Date: Saturday, June 17, 2023
Abstract Background Liver transplantation (LT) is a curative treatment option for hepatocellular carcinoma (HCC); recurrent HCC after liver transplantation (HCC-R) is diagnosed in 9%–16%. The ...objective of this study was to evaluate which factors are associated with R-HCC after liver transplantation. Methods This retrospective real-life study analyzed 278 LTs from 3 reference centers (2,093 LTs) in Brazil from 1988 to 2015. HCC-R with histologic confirmation was seen in 40 patients (14.4%). Results Most of them were male with cirrhosis secondary to viral hepatitis. Only 37.5% underwent chemoembolization, and 50% had cold ischemia time >8 hours. From the explant analysis, most of the patients were outside Milan criteria and 37.5% had microvascular invasion. The donors were mostly male, and the median intensive care unit time was >3 days. The Kaplan-Meier survival was lower according to alpha-fetoprotein (AFP) >200 ng/dL ( P = .02), and older donors and more blood transfusions were risk factors for HCC-R death. Conclusion AFP >200 ng/mL was associated with lower survival, and older donors and more blood transfusions were risk factors for death after HCC-R. A trend to lower survival was observed in patients who did not have chemoembolization and had cold ischemia times >8 hours.
The Qweak experimental apparatus Allison, T.; Anderson, M.; Androić, D. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
05/2015, Letnik:
781, Številka:
C
Journal Article
Recenzirano
Odprti dostop
The Jefferson Lab Qweak experiment determined the weak charge of the proton by measuring the parity-violating elastic scattering asymmetry of longitudinally polarized electrons from an unpolarized ...liquid hydrogen target at small momentum transfer. A custom apparatus was designed for this experiment to meet the technical challenges presented by the smallest and most precise e→p asymmetry ever measured. Technical milestones were achieved at Jefferson Lab in target power, beam current, beam helicity reversal rate, polarimetry, detected rates, and control of helicity-correlated beam properties. The experiment employed 180μA of 89% longitudinally polarized electrons whose helicity was reversed 960 times per second. The electrons were accelerated to 1.16GeV and directed to a beamline with extensive instrumentation to measure helicity-correlated beam properties that can induce false asymmetries. Møller and Compton polarimetry were used to measure the electron beam polarization to better than 1%. The electron beam was incident on a 34.4cm liquid hydrogen target. After passing through a triple collimator system, scattered electrons between 5.8° and 11.6° were bent in the toroidal magnetic field of a resistive copper-coil magnet. The electrons inside this acceptance were focused onto eight fused silica Cherenkov detectors arrayed symmetrically around the beam axis. A total scattered electron rate of about 7GHz was incident on the detector array. The detectors were read out in integrating mode by custom-built low-noise pre-amplifiers and 18-bit sampling ADC modules. The momentum transfer Q2=0.025GeV2 was determined using dedicated low-current (~100pA) measurements with a set of drift chambers before (and a set of drift chambers and trigger scintillation counters after) the toroidal magnet.
We report measurements of the parity-conserving beam-normal single-spin elastic scattering asymmetries Bn on 12C and 27Al, obtained with an electron beam polarized transverse to its momentum ...direction. These measurements add an additional kinematic point to a series of previous measurements of Bn on 12C and provide a first measurement on 27Al. The experiment utilized the Qweak apparatus at Jefferson Lab with a beam energy of 1.158 GeV. The average lab scattering angle for both targets was 7.7°, and the average Q2 for both targets was 0.02437 GeV2 (Q = 0.1561 GeV). The asymmetries are Bn = -10.68 ± 0.90 (stat) ± 0.57 (syst) ppm 12C and Bn = -12.16 ± 0.58 (stat) ± 0.62 (syst) ppm for 27Al. The results are consistent with theoretical predictions, and are compared to existing data. When scaled by Z/A, the Q dependence of all the far-forward angle (θ < 10°) data from 1H to 27Al can be described by the same slope out to Q ≈ 0.35 GeV. Larger-angle data from other experiments in the same Q range are consistent with a slope about twice as steep.
We report measurements of the parity-conserving beam-normal single-spin elastic scattering asymmetries Bn on 12C and 27Al, obtained with an electron beam polarized transverse to its momentum ...direction. These measurements add an additional kinematic point to a series of previous measurements of Bn on 12C and provide a first measurement on 27Al. The experiment utilized the Qweak apparatus at Jefferson Lab with a beam energy of 1.158 GeV. The average lab scattering angle for both targets was 7.7°, and the average Q2 for both targets was 0.02437 GeV2 (Q = 0.1561 GeV). The asymmetries are Bn = -10.68 ± 0.90 (stat) ± 0.57 (syst) ppm 12C and Bn = -12.16 ± 0.58 (stat) ± 0.62 (syst) ppm for 27Al. The results are consistent with theoretical predictions, and are compared to existing data. When scaled by Z/A, the Q dependence of all the far-forward angle (θ < 10°) data from 1H to 27Al can be described by the same slope out to Q ≈ 0.35 GeV. Larger-angle data from other experiments in the same Q range are consistent with a slope about twice as steep.
We report the measurement of the parity-violating asymmetry for the inelastic scattering of electrons from the proton, at $Q^2 = 0.082$ GeV$^2$ and $ W = 2.23$ GeV, above the resonance region. The ...result $A_{\rm Inel} = - 13.5 \pm 2.0 ({\rm stat}) \pm 3.9 ({\rm syst})$ ppm agrees with theoretical calculations, and helps to validate the modeling of the $\gamma Z$ interference structure functions $F_1^{\gamma Z}$ and $F_2^{\gamma Z}$ used in those calculations, which are also used for determination of the two-boson exchange box diagram ($\Box_{\gamma Z}$) contribution to parity-violating elastic scattering measurements. A positive parity-violating asymmetry for inclusive $\pi^-$ production was observed, as well as positive beam-normal single-spin asymmetry for scattered electrons and a negative beam-normal single-spin asymmetry for inclusive $\pi^-$ production.
Abstract Introduction Renal insufficiency can be associated with poor long-term survival of liver transplant recipients. Objective The objective of this study was to study renal insufficiency ...observed pretransplantation and its long-term impact after liver transplantation. Methods We analyzed retrospectively an electronic database collected prospectively including transplant records from June 1994 to October 2010 using piggyback venous reconstruction. The exclusion criteria were chronic kidney disease, acute hepatic failure, children up to 12 years of age, and retransplantations. Renal insufficiency was defined by the creatinine clearance (CCr) calculated using the Cockcroft-Gault method. Patients were distributed into 3 groups: CCr >90, between 90 and 60, and >60 mL/min/1.73 m2 . The survival rate was calculated using the Kaplan-Meier method and proportional hazards Cox regression analysis using death and CCr as stratifying variables evaluated predictive factors for survival. The groups were compared using the Kruskal-Wallis test with significant differences at P < .05. Results Among the 305 patients those who showed preoperative and postoperative CCR of >90 were 187/59.9% and 82/26.3%, 60 to 90 were 77/24.7% and 74/23.7%, or <60 mL/min/1.73 m2 were (41/13.1% and 149 (47.7%). Patients with preoperative CCr <60 mL/min/1.73 m2 showed worse short- and long-term survivals as well as the longest intensive care unit and hospital stays ( P = .034). The only predictive donor factor was age older than 40 years namely, the greatest hemotransfusion needs and postoperative liver and renal dysfunction (Chi square = 100.6064; P = .00001). The area under the curve (AUC) obtained using an receiver operating characteristic (ROC) analysis was 0.563 (95% CI 0.498−0.627) with a cut off of 30.25. Conclusion Pre–liver transplantation renal insufficiency seemed to be a predictive factor for long-term survival.
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