Accountants\u27 working papers

Originally published by: Ronald Press

State Dependence of Stimulus-Induced Variability Tuning in Macaque MT

Behavioral states marked by varying levels of arousal and attention modulate some properties of cortical responses (e.g. average firing rates or pairwise correlations), yet it is not fully understood what drives these response changes and how they might affect downstream stimulus decoding. Here we show that changes in state modulate the tuning of response variance-to-mean ratios (Fano factors) in a fashion that is neither predicted by a Poisson spiking model nor changes in the mean firing rate, with a substantial effect on stimulus discriminability. We recorded motion-sensitive neurons in middle temporal cortex (MT) in two states: alert fixation and light, opioid anesthesia. Anesthesia tended to lower average spike counts, without decreasing trial-to-trial variability compared to the alert state. Under anesthesia, within-trial fluctuations in excitability were correlated over longer time scales compared to the alert state, creating supra-Poisson Fano factors. In contrast, alert-state MT neurons have higher mean firing rates and largely sub-Poisson variability that is stimulus-dependent and cannot be explained by firing rate differences alone. The absence of such stimulus-induced variability tuning in the anesthetized state suggests different sources of variability between states. A simple model explains state-dependent shifts in the distribution of observed Fano factors via a suppression in the variance of gain fluctuations in the alert state. A population model with stimulus-induced variability tuning and behaviorally constrained information-limiting correlations explores the potential enhancement in stimulus discriminability by the cortical population in the alert state.Comment: 36 pages, 18 figure

Louisville Coronavirus Surveillance Program

An important feature of COVID-19, the disease produced by the new coronavirus SARS-CoV-2, is the high number of health care workers (HCWs) that acquire the disease. In an initial report of 138 patients hospitalized with COVID-19 pneumonia in China, 40 patients (29%) were HCWs. One reason why HCWs are at higher risk of acquiring COVID-19 is because some patients with COVID-19 are admitted to the hospital without the classical presentation, and are therefore not tested for the disease early during hospitalization. Presently in the US, it is recommended to test for COVID-19 when physicians suspect the disease. This subjective approach may allow hospital transmission of COVID-19 from patients without the classical clinical presentation. The primary objective of this study is to establish a surveillance system for early identification of patients hospitalized with COVID-19 to allow for early implementation of infection control interventions in an attempt to prevent transmission of COVID-19 to HCWs and other hospitalized patients. We are proposing to test all patients who present to the emergency departments and/or are hospitalized with signs and symptoms of respiratory infection or gastrointestinal infection for SARS-CoV-2, regardless of clinical suspicion of COVID-19. Biological samples obtained from all patients having symptoms of respiratory or gastrointestinal infection will be tested using real-time polymerase chain reaction (RT-PCR) for detection of SARS-CoV-2. Using a robotic instrument, the CMP laboratory will be able to test more than 500 samples a day. Data will be reported in real-time to participating hospitals for rapid implementation of infection control measures

Medicinal value of sunflower pollen against bee pathogens

Global declines in pollinators, including bees, can have major consequences for ecosystem services. Bees are dominant pollinators, making it imperative to mitigate declines. Pathogens are strongly implicated in the decline of native and honey bees. Diet affects bee immune responses, suggesting the potential for floral resources to provide natural resistance to pathogens. We discovered that sunflower (Helianthus annuus) pollen dramatically and consistently reduced a protozoan pathogen (Crithidia bombi) infection in bumble bees (Bombus impatiens) and also reduced a microsporidian pathogen (Nosema ceranae) of the European honey bee (Apis mellifera), indicating the potential for broad anti-parasitic effects. In a field survey, bumble bees from farms with more sunflower area had lower Crithidia infection rates. Given consistent effects of sunflower in reducing pathogens, planting sunflower in agroecosystems and native habitat may provide a simple solution to reduce disease and improve the health of economically and ecologically important pollinators

Genome-Wide Association Study Identifies Loci for Liver Enzyme Concentrations in Mexican Americans: The GUARDIAN Consortium.

ObjectivePopulations of Mexican American ancestry are at an increased risk for nonalcoholic fatty liver disease. The objective of this study was to determine whether loci in known and novel genes were associated with variation in aspartate aminotransferase (AST) (n = 3,644), alanine aminotransferase (ALT) (n = 3,595), and gamma-glutamyl transferase (GGT) (n = 1,577) levels by conducting the first genome-wide association study (GWAS) of liver enzymes, which commonly measure liver function, in individuals of Mexican American ancestry.MethodsLevels of AST, ALT, and GGT were determined by enzymatic colorimetric assays. A multi-cohort GWAS of individuals of Mexican American ancestry was performed. Single-nucleotide polymorphisms (SNP) were tested for association with liver outcomes by multivariable linear regression using an additive genetic model. Association analyses were conducted separately in each cohort, followed by a nonparametric meta-analysis.ResultsIn the PNPLA3 gene, rs4823173 (P = 3.44 × 10-10 ), rs2896019 (P = 7.29 × 10-9 ), and rs2281135 (P = 8.73 × 10-9 ) were significantly associated with AST levels. Although not genome-wide significant, these same SNPs were the top hits for ALT (P = 7.12 × 10-8 , P = 1.98 × 10-7 , and P = 1.81 × 10-7 , respectively). The strong correlation (r2  = 1.0) for these SNPs indicated a single hit in the PNPLA3 gene. No genome-wide significant associations were found for GGT.ConclusionsPNPLA3, a locus previously identified with ALT, AST, and nonalcoholic fatty liver disease in European and Japanese GWAS, is also associated with liver enzymes in populations of Mexican American ancestry

COPD exacerbation caused by SARS-CoV-2: A Case Report from the Louisville COVID-19 Surveillance Program

A 53-year-old male with a history of chronic obstructive pulmonary disease (COPD) on home oxygen presented to the hospital with worsening shortness of breath plus cough. He was admitted to the intensive care unit for COPD exacerbation and respiratory failure. A routine evaluation was performed including a nasopharyngeal swab for a respiratory viral panel, which was negative. His symptoms improved over 48 hours at which time a surveillance test for SARS-CoV-2 returned as positive. After clinical improvement, he was discharged to home isolation

Nanometer Scale Dielectric Fluctuations at the Glass Transition

Using non-contact scanning probe microscopy (SPM) techniques, dielectric properties were studied on 50 nanometer length scales in poly-vinyl-acetate (PVAc) films in the vicinity of the glass transition. Low frequency (1/f) noise observed in the measurements, was shown to arise from thermal fluctuations of the electric polarization. Anomalous variations observed in the noise spectrum provide direct evidence for cooperative nano-regions with heterogeneous kinetics. The cooperative length scale was determined. Heterogeneity was long-lived only well below the glass transition for faster than average processes.Comment: 4 pages, 4 embedded PS figures, RevTeX - To appear in Phys. Rev. Let

Endemic Human Coronaviruses in Hospitalized Adults with Community-Acquired Pneumonia: Results from the Louisville Pneumonia Study

Introduction: There are four endemic serotypes of human coronavirus (HCoV) that may cause community-acquired pneumonia (CAP) in humans. The clinical syndrome of CAP due to HCoVs is not well characterized. The objectives of this study were to evaluate incidence, epidemiology, and outcomes of CAP in adults due to HCoV and to compare them with CAP due to influenza. Methods: The Louisville Pneumonia Study (LPS) is a prospective observational study of hospitalized adult patients with CAP in the city of Louisville. Patients enrolled in the LPS in whom a respiratory viral panel polymerase chain reaction (PCR) was obtained were evaluated. Incidence, epidemiology, and outcomes were compared for patients with a positive PCR for HCoV versus patients with a positive PCR for influenza. Results: From 1,974 CAP patients with a PCR performed, HCoV was identified in 65 patients (3.3%), corresponding to the following serotypes: HCoV-229E in 12 patients, HCoV-OC43 in 38 patients, HCoV-NL63 in 6 patients and HCoV-HKU1 in 9 patients. No differences were observed in clinical presentation and early outcomes for patients with CAP due to HCoV compared to 244 patients with CAP due to influenza. One-year mortality after hospitalization was 32% for patients with CAP due to HCoV versus 13% for patients with CAP due to influenza. Conclusions: When compared to patients with CAP due to influenza, the clinical presentation of patients with CAP due to HCoV is similar, but these patients have significantly worse outcomes one year after hospitalization

Heavy Drinking Is Associated with Poor Blood Pressure Control in the REasons for Geographic and Racial Differences in Stroke (REGARDS) Study

Alcohol intake has been shown to have a J-shaped association with blood pressure (BP). However, this association has not been examined in mixed race populations or in people with diabetes where tighter blood pressure control is recommended. Participants in the REGARDS study who were 45 years or older (n = 30,239) were included. Medical history (including self-reported alcohol intake) was collected by telephone while blood collection and clinical measurements were done during an in-home visit. We defined diabetes as use of medications and/or fasting glucose ≥ 126 mg/dL and hypertension as use of blood pressure lowering medications and/or BP ≥ 140/90 mmHg or BP ≥ 130/80 mmHg in people with diabetes. After adjustment for confounders, heavy drinking was associated with an increased odds of hypertension (OR = 1.59; 95% CI = 1.37, 1.87). Diabetes and gender significantly modified (interaction P < 0.05 for both) the association between alcohol use and hypertension, although heavy drinking remained associated with increased odds of hypertension in sub-group analyses. We did not observe the previously described J-shaped relationship in any sub-group except white females. These data suggest heavy alcohol consumption is associated with poor BP control and that heavy drinkers may want to consider limiting alcohol intake in order to manage hypertension

Community-Acquired Pneumonia due to Endemic Human Coronaviruses compared to 2019 Novel Coronavirus: A Review

The human coronaviruses (HCoVs) are an important etiology of community-acquired respiratory tract infections. Community-acquired pneumonia (CAP) may be caused by serotypes of endemic HCoVs or highly pathogenic HCoVs. In this review we compared the clinical characteristic, management, outcomes, and infection control practices for patients with CAP due to endemic HCoVs versus patients with CAP due to 2019 novel coronavirus