Neural Processing at the Speed of Smell

AbstractOlfaction is typically described as behaviorally slow, suggesting neural processes on the order of hundreds of milliseconds to seconds as candidate mechanisms in the creation of olfactory percepts. Whereas a recent study challenged this view in suggesting that a single sniff was sufficient for optimal olfactory discrimination, a study by Abraham et al. in this issue of Neuron sets out to negate the challenge by demonstrating increased processing time for discrimination of similar versus dissimilar stimuli. Here we reconcile both studies, which in our view together support the notion of a speed-accuracy tradeoff in olfactory discriminations that are made within about 200 ms. These findings are discussed in light of the challenges related to defining olfactory perceptual similarity in nonhuman animals

Liver Adiposity and Metabolic Profile in Individuals with Chronic Spinal Cord Injury

Purpose. To quantify liver adiposity using magnetic resonance imaging (MRI) and to determine its association with metabolic profile in men with spinal cord injury (SCI). Materials and Methods. MRI analysis of liver adiposity by fat signal fraction (FSF) and visceral adipose tissue (VAT) was completed on twenty participants. Intravenous glucose tolerance test was conducted to measure glucose effectiveness (g) and insulin sensitivity (i ). Lipid panel, fasting glucose, glycated hemoglobin (HbA1c), and inflammatory cytokines were also analyzed. Results. Average hepatic FSF was 3.7% ± 2.1. FSF was positively related to TG, non-HDL-C, fasting glucose, HbA1c, VAT, and tumor necrosis factor alpha (TNF-). FSF was negatively related to i and testosterone. FSF was positively related to VAT ( = 0.48, = 0.032) and TNF- ( = 0.51, = 0.016) independent of age, level of injury (LOI), and time since injury (TSI). The associations between FSF and metabolic profile were independent of VAT. Conclusions. MRI noninvasively estimated hepatic adiposity in men with chronic SCI. FSF was associated with dysfunction in metabolic profile, central adiposity, and inflammation. Importantly, liver adiposity influenced metabolic profile independently of VAT. These findings highlight the significance of quantifying liver adiposity after SCI to attenuate the development of metabolic disorders

Predicting odor perceptual similarity from odor structure

To understand the brain mechanisms of olfaction we must understand the rules that govern the link between odorant structure and odorant perception. Natural odors are in fact mixtures made of many molecules, and there is currently no method to look at the molecular structure of such odorant-mixtures and predict their smell. In three separate experiments, we asked 139 subjects to rate the pairwise perceptual similarity of 64 odorant-mixtures ranging in size from 4 to 43 mono-molecular components. We then tested alternative models to link odorant-mixture structure to odorant-mixture perceptual similarity. Whereas a model that considered each mono-molecular component of a mixture separately provided a poor prediction of mixture similarity, a model that represented the mixture as a single structural vector provided consistent correlations between predicted and actual perceptual similarity (r≥0.49, p<0.001). An optimized version of this model yielded a correlation of r = 0.85 (p<0.001) between predicted and actual mixture similarity. In other words, we developed an algorithm that can look at the molecular structure of two novel odorant-mixtures, and predict their ensuing perceptual similarity. That this goal was attained using a model that considers the mixtures as a single vector is consistent with a synthetic rather than analytical brain processing mechanism in olfaction

Increasing access to reproductive health care through improved service delivery

The study documented in this report examines the provision and utilization of public and private sector maternal and child health services in Punjab, Pakistan with a focus on family planning (FP) services. It is aimed at enabling a better understanding of the specific demand and supply dynamics leading to low contraceptive prevalence despite unmet need, and the opportunities that must be seized to enhance access to quality family planning services. The report is part of a larger project being implemented by the Population Council with the assistance of the Department for International Development, UK entitled “Sustaining Focus on Provincial Governments for FP 2020 Goals and Increasing Access to Reproductive Healthcare through Improved Service Delivery.” The findings of the study suggest that there is scope for improving delivery of FP services and methods through all four major sectors, i.e., the public health facilities, the private health facilities, Lady Health Workers, and pharmacies. Based on its findings, the report recommends specific measures and approaches to address unmet need for family planning and the skewed method mix in Punjab

Effects of Emblica Officinalis Extract Cream on Human Skin Trans-epidermal Water Loss Measured with Non Invasive Probe

The purpose of this study was to assess hydroalcoholic Emblica officinalis fruit extract cream on human skin trans-epidermal water loss (TEWL). Ten male volunteers were examined in this study. Measurements were made on cheeks. Creams with different concentrations of ABIL® EM 90 and liquid paraffin containing 3% hydroalcoholic Emblica officinalis fruit extract were developed and tested for stability studies for a period of 28 days. Selected cream and its base were further assessed in different conditions at 8 °C (in refrigerator), 25 °C (in incubator), 40 °C (in incubator) and 40 °C (in incubator) with 75% relative humidity (RH) for color, odor, thickness, grittiness liquefaction, phase separation, and pH at different time intervals. Trans-epidermal water loss (TEWL) was monitored every week by non-invasive bio-instrument Tewameter MPA 5. All measurements were made statistically by ANOVA and t-paired test. Significant decrease on skin TEWL was produced. Keywords: Hydroalcoholic Emblica officinalis fruit extract, Facial cream, Biophysical paramete

Situation analysis of reproductive health of adolescents and youth in Pakistan

This report presents a situation analysis of the reproductive health of adolescents and youth in Pakistan. It is intended to contribute to evidence-based policies and programs for realizing reproductive rights and choices for young people through health information and services, education programs, and strategic partnerships. The study included a literature review, secondary analysis of data from the Pakistan Demographic Health Surveys and Multiple Indicator Cluster Surveys, and a qualitative study of perspectives of unmarried adolescent boys and girls (aged 15–19), including both school-going and out-of-school individuals, as well as boys and girls with disabilities, in peri-urban areas of Islamabad, Lahore, Karachi, Peshawar, and Quetta. Major themes of the research include puberty, marriage, fertility, family planning, utilization of reproductive health services, rights awareness, and gender-based violence. Findings about married young people are based on secondary data analysis, while qualitative findings concern unmarried adolescents

Clino-pathological features of urinary tract infection: a study at Nishtar University Hospital Multan, Punjab, Pakistan

Background: Urinary tract infection (UTI) is a common clinical issue among pediatric population and might progress into renal scaring, hypertension as well as end stage kidney disease. This study was aimed at finding clino-pathological features of UTI and antibiotic sensitivity against most common causative agents involved at a tertiary care hospital of South Punjab, Pakistan.Methods: This descriptive case series study was conducted at department of Paediatric Medicine, Nishtar University Hospital Multan from July to December 2019. A total of 100 children fulfilling the inclusion criteria, presenting in outpatient department or emergency section of paediatric medicine department, having positive urine culture and sensitivity were selected. Their detailed history, clinical examination and relevant investigations were done.Results: Out of the 100 children, 73 (73.0%) were female and 27 (27.0%) were male. There were 57 (57.0%) children from 1 year to 4 years age group and 43 (43.0%) were of more than 4 years. Most common clinical presentations were fever 83 (83.0%), urinary symptoms, vomiting 52 (52.0%) and pain abdomen 48 (48.0%). Most common aetiological agents were Escherichia coli 74 (74.0%) and Klebsiella pneumoniae 9 (9.0%).Conclusions: UTI is more common in female children. Most common presentation observed was fever and/or urinary symptoms while most common aetiological agent was E. coli

Computational investigation of an unsteady non-Newtonian and non-isothermal fluid between coaxial contracting channels: A PCM approach

n/