The LUX-ZEPLIN (LZ) experiment Akimov, D.Yu; Angelides, N.; Araújo, H.M. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
02/2020, Letnik:
953, Številka:
C
Journal Article
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We describe the design and assembly of the LUX-ZEPLIN experiment, a direct detection search for cosmic WIMP dark matter particles. The centerpiece of the experiment is a large liquid xenon time ...projection chamber sensitive to low energy nuclear recoils. Rejection of backgrounds is enhanced by a Xe skin veto detector and by a liquid scintillator Outer Detector loaded with gadolinium for efficient neutron capture and tagging. LZ is located in the Davis Cavern at the 4850’ level of the Sanford Underground Research Facility in Lead, South Dakota, USA. We describe the major subsystems of the experiment and its key design features and requirements.
Somatic alterations of fibroblast growth factor receptors (FGFRs) have been described in a wide range of malignancies. A number of anti-FGFR therapies are currently under investigation in clinical ...trials for subjects with FGFR gene amplifications, mutations and translocations. Here, we develop cell line models of acquired resistance to FGFR inhibition by exposure of cell lines harboring FGFR3 gene amplification and translocation to the selective FGFR inhibitor BGJ398 and multitargeted FGFR inhibitor ponatinib. We show that the acquisition of resistance is rapid, reversible and characterized by an epithelial to mesenchymal transition and a switch from dependency on FGFR3 to ERBB family members. Acquired resistance was associated with demonstrable changes in gene expression including increased production of ERBB2/3 ligands, which were sufficient to drive resistance in the setting of FGFR3 dependency but not dependency on other FGFR family members. These data support the concept that activation of ERBB family members is sufficient to bypass dependency on FGFR3 and suggest that concurrent inhibition of these two pathways may be desirable when targeting FGFR3-dependent cancers.
Summary
Background
Psychiatric co‐morbidity, in particular major depression and anxiety, is common in patients with Crohn's disease (CD) and ulcerative colitis (UC). Prior studies examining this may ...be confounded by the co‐existence of functional bowel symptoms. Limited data exist examining an association between depression or anxiety and disease‐specific endpoints such as bowel surgery.
Aims
To examine the frequency of depression and anxiety (prior to surgery or hospitalisation) in a large multi‐institution electronic medical record (EMR)‐based cohort of CD and UC patients; to define the independent effect of psychiatric co‐morbidity on risk of subsequent surgery or hospitalisation in CD and UC, and to identify the effects of depression and anxiety on healthcare utilisation in our cohort.
Methods
Using a multi‐institution cohort of patients with CD and UC, we identified those who also had co‐existing psychiatric co‐morbidity (major depressive disorder or generalised anxiety). After excluding those diagnosed with such co‐morbidity for the first time following surgery, we used multivariate logistic regression to examine the independent effect of psychiatric co‐morbidity on IBD‐related surgery and hospitalisation. To account for confounding by disease severity, we adjusted for a propensity score estimating likelihood of psychiatric co‐morbidity influenced by severity of disease in our models.
Results
A total of 5405 CD and 5429 UC patients were included in this study; one‐fifth had either major depressive disorder or generalised anxiety. In multivariate analysis, adjusting for potential confounders and the propensity score, presence of mood or anxiety co‐morbidity was associated with a 28% increase in risk of surgery in CD (OR: 1.28, 95% CI: 1.03–1.57), but not UC (OR: 1.01, 95% CI: 0.80–1.28). Psychiatric co‐morbidity was associated with increased healthcare utilisation.
Conclusions
Depressive disorder or generalised anxiety is associated with a modestly increased risk of surgery in patients with Crohn's disease. Interventions addressing this may improve patient outcomes.
Based on the Seebeck and Peltier effects, state‐of‐the‐art bismuth telluride‐based thermoelectric materials, which are capable of direct and reversible conversion of thermal to electrical energy, ...have great potential in energy harvesting and solid‐state refrigerators. However, their widespread use is limited by their low conversion efficiency, which is determined by the dimensionless figure‐of‐merit (ZT). Significant enhancement of ZT is a great challenge owing to the common interdependence of electrical and thermal conductivity. Here, it is demonstrated that by incorporating nanoamorphous boron into the p‐type Bi0.5Sb1.5Te3, a record high ZT of 1.6 at 375 K is achieved. It is shown that a high density of nanostructures and dislocations due to the incorporation of the boron inclusions, leads to a significant reduction of thermal conductivity and improved charge transport. The findings represent an important step to further promote the development of thermoelectric technology and its widespread application in solid‐state refrigeration and power generation from waste heat.
A breakthrough in ultra‐high thermoelectric performance is achieved in p‐type bulk BiSbTe/Boron nanocomposite materials, which has great potential for wide application in solid‐state refrigeration and power generation.
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