The host galaxy of a fast radio burst.

In recent years, millisecond-duration radio signals originating in distant galaxies appear to have been discovered in the so-called fast radio bursts. These signals are dispersed according to a precise physical law and this dispersion is a key observable quantity, which, in tandem with a redshift measurement, can be used for fundamental physical investigations. Every fast radio burst has a dispersion measurement, but none before now have had a redshift measurement, because of the difficulty in pinpointing their celestial coordinates. Here we report the discovery of a fast radio burst and the identification of a fading radio transient lasting ~6 days after the event, which we use to identify the host galaxy; we measure the galaxy's redshift to be z = 0.492 ± 0.008. The dispersion measure and redshift, in combination, provide a direct measurement of the cosmic density of ionized baryons in the intergalactic medium of ΩIGM = 4.9 ± 1.3 per cent, in agreement with the expectation from the Wilkinson Microwave Anisotropy Probe, and including all of the so-called 'missing baryons'. The ~6-day radio transient is largely consistent with the radio afterglow of a short γ-ray burst, and its existence and timescale do not support progenitor models such as giant pulses from pulsars, and supernovae. This contrasts with the interpretation of another recently discovered fast radio burst, suggesting that there are at least two classes of bursts.

Implementation of a practice plan for the outpatient cardiac evaluation of children after acute SARS-CoV-2 infection and a report of outcomes.

SARS-CoV-2 infection has been associated with cardiovascular disease in children, but which children need cardiac evaluation is unclear. We describe our experience evaluating 206 children for cardiac disease following SARS-CoV-2 infection (one of whom had ventricular ectopy) and propose a new guideline for management of these children. Routine cardiac screening after SARS-CoV-2 infection in children without any cardiac signs or symptoms does not appear to be high yield.

Permanent and long-acting reversible contraception volumes at a multihospital system in Ohio before and after Dobbs.

OBJECTIVES: Immediately following the Dobbs decision, Ohio prohibited abortion after the detection of fetal cardiac activity. We aimed to characterize changes in the uptake of long-acting reversible contraception (LARC) and permanent contraception following the abrupt enactment of restrictive abortion legislation. STUDY DESIGN: We conducted a retrospective cohort study using electronic medical record data of patients aged 15 to 55 who underwent permanent contraception (tubal ligation, vasectomy) or LARC placement (intrauterine device, contraceptive implant) at a multihospital system in northeast Ohio from January 1, 2022 to Decemeber 31, 2022, 6 months before and after Dobbs. We compared procedure volumes and patient characteristics. RESULTS: We identified 4247 tubal ligation and LARC procedures pre-Dobbs, including 725 (17.1%) permanent contraception and 3522 (82.9%) LARC. Post-Dobbs, the total number of tubal ligation and LARC procedures increased by 15.8% (4916), and there was a significant increase in the proportion of permanent contraception, (p < 0.001). Vasectomy volume increased by 33.3% post-Dobbs, from 1193 to 1590 procedures. Compared to pre-Dobbs, patients undergoing contraceptive procedures post-Dobbs were younger (tubal ligation and LARC, 30.9 median years [24.5, 36.8] vs 31.5 [25.2, 36.9], p = 0.011; vasectomy, median 36.6 years [32.9, 39.6] vs 37.2 [34.2, 40.4], p < 0.001) and more likely to report single relationship status (57.4% vs 55.9% for tubal ligation and LARC, p = 0.028% and 23.0% vs 18.1% for vasectomy, p = 0.002). CONCLUSIONS: This study demonstrates increased uptake of contraceptive procedures following the Dobbs decision. This rise in permanent contraception suggests a relationship between abortion policy and contraceptive decision-making, especially among younger patients. IMPLICATIONS: Increased permanent and long-acting reversible contraception procedures following Dobbs reveal shifting contraceptive choices, particularly among younger individuals, indicating a connection between abortion policy and reproductive decisions.

Gynecologic infection rates after ablation treatment for cervical intraepithelial neoplasia grade 2 and higher (CIN2+): Secondary analysis of a non-inferiority randomized trial.

Although concerns have been raised regarding potential infection and morbidity in women undergoing ablation treatment for cervical precancer in low- and middle-income countries (LMIC), there is extremely limited data to substantiate this claim. This is a secondary analysis of a randomized non-inferiority trial (id: NCT03084081) that compares the efficacy and safety of three ablation treatments for biopsy-confirmed cervical intraepithelial neoplasia grade 2 or higher (CIN2+): CO2 gas-based cryotherapy, non-gas cryotherapy, and thermal ablation (TA). Here, we present findings regarding the incidence of sexually transmitted infections (STI) and vaginitis post-treatment. Samples were collected at enrollment and again at 6 weeks post-treatment and assessed for STIs (Chlamydia trachomatis (CT), Neisseria gonorrhea (NG), and Trichomonas vaginalis (TV)) and vaginitis (Bacterial vaginosis (BV) and/or Candida albicans (Candida)). This analysis reflects 864 women with baseline and 6-week follow-up data. None of the ablative treatments put women at increased risk for STIs (CT, NG, TV) or vaginitis (BV, Candida). While most women adhered to post-treatment recommendations (97%) and no difference by treatment arm was observed, the incidence of STIs at follow-up in women that did not adhere with a given recommendation was higher compared to their adherent counterparts. The incidence of gynecologic infection did not increase with any of the ablation treatments from baseline to the six-week follow-up. Non-gas cryotherapy and TA emerge as safe alternatives to gas-based cryotherapy with respect to gynecologic infection rates.

Terahertz excitation of a coherent λ-type three-level system of exciton-polariton modes in a quantum-well microcavity.

Interactions of few-cycle terahertz pulses with the induced optical polarization in a quantum-well microcavity reveal that the lower and higher exciton-polariton modes together with the optically forbidden 2p-exciton state form a unique Λ-type three-level system. Pronounced nonlinearities are observed via time-resolved strong-terahertz and weak-optical excitation spectroscopy and explained with a fully microscopic theory. The results show that the terahertz pulses strongly couple the exciton-polariton states to the 2p-exciton state while no resonant transition between the two polariton levels is observed.

Synthesis of cis-octahydroindoles via intramolecular 1,3-dipolar cycloaddition of 2-acyl-5-aminooxazolium salts.

A concise method for the diastereoselective synthesis of octahydroindoles is presented. The products contain 2-amido and 7-hydroxyl substituents. A series of 2-acyl-5-aminooxazoles were prepared in one step. Upon methylation of the oxazole nitrogen atom, the substrates underwent rapid intramolecular 1,3-dipolar cycloaddition with a tethered alkene and, after reduction with excess hydride, produced octahydroindoles with excellent diastereoselectivity. The method allows for the installation of α-quaternary stereogenic carbon atoms.

Sex-dependent influence of postweaning environmental enrichment in Angelman syndrome model mice.

INTRODUCTION: Angelman syndrome (AS) is a rare neurodevelopmental disorder caused by mutation or loss of UBE3A and marked by intellectual disability, ataxia, autism-like symptoms, and other atypical behaviors. One route to treatment may lie in the role that environment plays early in postnatal life. Environmental enrichment (EE) is one manipulation that has shown therapeutic potential in preclinical models of many brain disorders, including neurodevelopmental disorders. Here, we examined whether postweaning EE can rescue behavioral phenotypes in Ube3a maternal deletion mice (AS mice), and whether any improvements are sex-dependent. METHODS: Male and female mice (C57BL/6J Ube3atm1Alb mice and wild-type (WT) littermates; ≥10 mice/group) were randomly assigned to standard housing (SH) or EE at weaning. EE had a larger footprint, a running wheel, and a variety of toys that promoted foraging, burrowing, and climbing. Following 6 weeks of EE, animals were submitted to a battery of tests that reliably elicit behavioral deficits in AS mice, including rotarod, open field, marble burying, and forced swim; weights were also monitored. RESULTS: In male AS-EE mice, we found complete restoration of motor coordination, marble burying, and forced swim behavior to the level of WT-SH mice. We also observed a complete normalization of exploratory distance traveled in the open field, but we found no rescue of vertical behavior or center time. AS-EE mice also had weights comparable to WT-SH mice. Intriguingly, in the female AS-EE mice, we found a failure of EE to rescue the same behavioral deficits relative to female WT-SH mice. CONCLUSIONS: Environmental enrichment is an effective route to correcting the most penetrant phenotypes in male AS mice but not female AS mice. This finding has important implications for the translatability of early behavioral intervention for AS patients, most importantly the potential dependency of treatment response on sex.

Deficits in cerebellum-dependent learning and cerebellar morphology in male and female BTBR autism model mice.

Recently, there has been increased interest in the role of the cerebellum in autism spectrum disorders (ASD). To better understand the pathophysiological role of the cerebellum in ASD, it is necessary to have a variety of mouse models that have face validity for cerebellar disruption in humans. Here, we add to the literature on the cerebellum transgenic and induced mouse models of autism with the characterization of the cerebellum in the BTBR T+Itpr3tf/J (BTBR) inbred mouse strain, which has behavioral phenotypes that are suggestive of ASD in patients. When we examined both male and female BTBR mice in comparison to C57BL/6J (C57) controls, we noted that both sexes of BTBR mice showed motor coordination deficits characteristic of cerebellar dysfunction, but only the male mice showed differences in delay eyeblink conditioning, a cerebellum-dependent learning task that is also disrupted in ASD patients. Both male and female BTBR mice showed considerable expansion of and abnormal foliation in the cerebellum vermis--including significant expansion of specific lobules in the anterior cerebellum. In addition, we found a slight but significant decrease in Purkinje cell density in both male and female BTBR mice, irrespective of lobule. Furthermore, there was a marked reduction of Purkinje cell dendritic spines density in both male and female BTBR mice. These findings suggest that, for the most part, the BTBR mouse model successfully phenocopies many of the characteristics of the subpopulation of ASD patients that have a hypertrophic cerebellum. We discuss the significance of strain differences in the cerebellum as well as the importance of this first effort to identify both concordances and difference between male and female BTBR mice with regard to the cerebellum.

Terahertz imaging and spectroscopy of large-area single-layer graphene.

We demonstrate terahertz (THz) imaging and spectroscopy of a 15 × 15-mm2 single-layer graphene film on Si using broadband THz pulses. The THz images clearly map out the THz carrier dynamics of the graphene-on-Si sample, allowing us to measure sheet conductivity with sub-mm resolution without fabricating electrodes. The THz carrier dynamics are dominated by intraband transitions and the THz-induced electron motion is characterized by a flat spectral response. A theoretical analysis based on the Fresnel coefficients for a metallic thin film shows that the local sheet conductivity varies across the sample from σ(s) = 1.7 × 10(-3) to 2.4 × 10(-3) Ω(-1) (sheet resistance, ρ(s) = 420 - 590 Ω/sq).

Ischemic heart disease: Cellular and molecular immune contributions of the pericardium.

Ischemic heart disease promotes complex inflammatory and remodeling pathways which contribute to the development of chronic heart failure. Although blood-derived and local cardiac mediators have traditionally been linked with these processes, the pericardial space has more recently been noted as alternative contributor to the injury response in the heart. The pericardial space contains fluid rich in physiologically active mediators, and immunologically active adipose tissue, which are altered during myocardial infarction. Key immune cells in the pericardial fluid and adipose tissue have been identified which act as mediators for cell recruitment and function after myocardial infarction have been identified in experimental models. Here, we provide an overview of the current understanding of the inflammatory mechanisms of the pericardial space and their role in post-myocardial infarction remodeling and the potential for the use of the pericardial space as a delivery vehicle for treatments to modulate heart healing.

An Intact Pericardium Ischemic Rodent Model.

This protocol has shown that the pericardium and its contents play an essential anti-fibrotic role in the ischemic rodent model (coronary ligation to induce myocardial injury). The majority of pre-clinical myocardial infarction models require the disruption of pericardial integrity with loss of the homeostatic cellular milieu. However, recently a methodology has been developed by us to induce myocardial infarction, which minimizes pericardial damage and retains the heart's resident immune cell population. An improved cardiac functional recovery in mice with an intact pericardial space following coronary ligation has been observed. This method provides an opportunity to study inflammatory responses in the pericardial space following myocardial infarction. Further development of the labeling techniques can be combined with this model to understand the fate and function of pericardial immune cells in regulating the inflammatory mechanisms that drive remodeling in the heart, including fibrosis.

Prevention of Post-Operative Adhesions: A Comprehensive Review of Present and Emerging Strategies.

Post-operative adhesions affect patients undergoing all types of surgeries. They are associated with serious complications, including higher risk of morbidity and mortality. Given increased hospitalization, longer operative times, and longer length of hospital stay, post-surgical adhesions also pose a great financial burden. Although our knowledge of some of the underlying mechanisms driving adhesion formation has significantly improved over the past two decades, literature has yet to fully explain the pathogenesis and etiology of post-surgical adhesions. As a result, finding an ideal preventative strategy and leveraging appropriate tissue engineering strategies has proven to be difficult. Different products have been developed and enjoyed various levels of success along the translational tissue engineering research spectrum, but their clinical translation has been limited. Herein, we comprehensively review the agents and products that have been developed to mitigate post-operative adhesion formation. We also assess emerging strategies that aid in facilitating precision and personalized medicine to improve outcomes for patients and our healthcare system.

Lense-Thirring frame dragging induced by a fast-rotating white dwarf in a binary pulsar system.

Radio pulsars in short-period eccentric binary orbits can be used to study both gravitational dynamics and binary evolution. The binary system containing PSR J1141-6545 includes a massive white dwarf (WD) companion that formed before the gravitationally bound young radio pulsar. We observed a temporal evolution of the orbital inclination of this pulsar that we infer is caused by a combination of a Newtonian quadrupole moment and Lense-Thirring (LT) precession of the orbit resulting from rapid rotation of the WD. LT precession, an effect of relativistic frame dragging, is a prediction of general relativity. This detection is consistent with an evolutionary scenario in which the WD accreted matter from the pulsar progenitor, spinning up the WD to a period of <200 seconds.

Direct Effects of Empagliflozin on Extracellular Matrix Remodelling in Human Cardiac Myofibroblasts: Novel Translational Clues to Explain EMPA-REG OUTCOME Results.

BACKGROUND: Empagliflozin, an SGLT2 inhibitor, has shown remarkable reductions in cardiovascular mortality and heart failure admissions (EMPA-REG OUTCOME). However, the mechanism underlying the heart failure protective effects of empagliflozin remains largely unknown. Cardiac fibroblasts play an integral role in the progression of structural cardiac remodelling and heart failure, in part, by regulating extracellular matrix (ECM) homeostasis. The objective of this study was to determine if empagliflozin has a direct effect on human cardiac myofibroblast-mediated ECM remodelling. METHODS: Cardiac fibroblasts were isolated via explant culture from human atrial tissue obtained at open heart surgery. Collagen gel contraction assay was used to assess myofibroblast activity. Cell morphology and cell-mediated ECM remodelling was examined with the use of confocal microscopy. Gene expression of profibrotic markers was assessed with the use of reverse-transcription quantitative polymerase chain reaction. RESULTS: Empagliflozin significantly attenuated transforming growth factor ß1-induced fibroblast activation via collagen gel contraction after 72-hour exposure, with escalating concentrations (0.5 µmol/L, 1 µmol/L, and 5 µmol/L) resulting in greater attenuation. Morphologic assessment showed that myofibroblasts exposed to empagliflozin were smaller in size with shorter and fewer number of extensions, indicative of a more quiescent phenotype. Moreover, empagliflozin significantly attenuated cell-mediated ECM remodelling as measured by collagen fibre alignment index. Gene expression profiling revealed significant suppression of critical profibrotic markers by empagliflozin, including COL1A1, ACTA2, CTGF, FN1, and MMP-2. CONCLUSIONS: We provide novel data showing a direct effect of empagliflozin on human cardiac myofibroblast phenotype and function by attenuation of myofibroblast activity and cell-mediated collagen remodelling. These data provide critical insights into the profound effects of empagliflozin as noted in the EMPA-REG OUTCOME study.

Computational aerodynamics for aircraft design.

This article outlines some of the principal issues in the development of numerical methods for the prediction of flows over aircraft and their use in the design process. These include the choice of an appropriate mathematical model, the design of shock-capturing algorithms, the treatment of complex geometric configurations, and shape modifications to optimize the aerodynamic performance.

The thalamus in drug addiction: from rodents to humans.

Impairments in response inhibition and salience attribution (iRISA) have been proposed to underlie the clinical symptoms of drug addiction as mediated by cortico-striatal-thalamo-cortical networks. The bulk of evidence supporting the iRISA model comes from neuroimaging research that has focused on cortical and striatal influences with less emphasis on the role of the thalamus. Here, we highlight the importance of the thalamus in drug addiction, focusing on animal literature findings on thalamic nuclei in the context of drug-seeking, structural and functional changes of the thalamus as measured by imaging studies in human drug addiction, particularly during drug cue and non-drug reward processing, and response inhibition tasks. Findings from the animal literature suggest that the paraventricular nucleus of the thalamus, the lateral habenula and the mediodorsal nucleus may be involved in the reinstatement, extinction and expression of drug-seeking behaviours. In support of the iRISA model, the human addiction imaging literature demonstrates enhanced thalamus activation when reacting to drug cues and reduced thalamus activation during response inhibition. This pattern of response was further associated with the severity of, and relapse in, drug addiction. Future animal studies could widen their field of focus by investigating the specific role(s) of different thalamic nuclei in different phases of the addiction cycle. Similarly, future human imaging studies should aim to specifically delineate the structure and function of different thalamic nuclei, for example, through the application of advanced imaging protocols at higher magnetic fields (7 Tesla).This article is part of a discussion meeting issue 'Of mice and mental health: facilitating dialogue between basic and clinical neuroscientists'.

Characterization and use of neuraminidase-modified L1210 plasma membranes for protection against tumor growth.

Purified plasma membranes were prepared from L1210 ascites tumor cells and analyzed for their protein and carbohydrate composition. Conditions were developed for treating the isolated plasma membranes with Vibrio cholerae neuraminidase (VCN) so that 88% of the N-acetylneuraminic acid was removed without changing membrane proteins or other membrane carbohydrate constituents. The VCN-induced modifications were characterized by labeling VCN-treated and untreated L1210 cells by the galactose oxidase:sodium [3H]borohydride procedure. This showed that N-acetylneuraminic acid is the predominant saccharide at the nonreducing terminus of plasma membrane glycoproteins and that galactose and/or N-acetylgalactosamine residues are penultimate to these. VCN modification exposed the penultimate residues and was not limited to any single plasma membrane glycoprotein. DBA/2J mice were given i.p. injections of VCN-treated or untreated membranes and were challenged 3 weeks later with 10(4) viable L1210 cells. Mice pretreated with VCN-treated membranes resisted the tumor challenge; those receiving untreated membranes or no treatment succumbed to the tumor. Our results demonstrate that appropriately modified plasma membranes can be used to induce resistance to tumor growth. They also suggest that tumor cell membrane carbohydrate structures have an important role in this phenomenon.

Immunotherapy of L1210 leukemia using neuraminidase-modified plasma membranes combined with chemotherapy.

Purified L1210 plasma membranes treated with Vibrio cholerae neuraminidase (VCN) were used for active immunotherapy of L1210 tumors in DBA/2J mice. Immunotherapy with VCN-treated membranes was effective only when combined with 1-(2-chloroethyl)-3-(4-methylcyclohexyl)-1-nitrosourea (MeCCNU). Successful therapy was a function of the dose of MeCCNU, the dose of VCN-treated membranes, and the time after MeCCNU treatment when VCN-treated membranes were administered. Optimum conditions for treating animals with tumors initiated with 10(4) cells were MeCCNU (20/kg) given 3 days after tumor inoculation and 0.25 mg VCN-treated membranes given 1 day after chemotherapy. Control membranes, not treated with VCN, that were administered 1 day after MeCCNU were ineffective; when given 4 days after chemotherapy, the caused accelerated mortality, suggesting immunological enhancement of tumor growth. Our results indicate that VCN-treated plasma membranes can be used for active immunotherapy of established tumors and underscore the importance of carefully designing immunotherapy protocols to achieve optimum desirable effects.