Pure Chitosan Biomedical Textile Fibers from Mixtures of Low- and High-Molecular Weight Bidisperse Polymer Solutions: Processing and Understanding of Microstructure-Mechanical Properties' Relationship.

Natural polymers, as extracted from biomass, may exhibit large macromolecular polydispersity. We investigated the impact of low molar mass chitosan (LMW, DP~115) on the properties of chitosan fibers obtained by wet spinning of chitosan solutions with bimodal distributions of molar masses. The fiber crystallinity index () was assessed by synchrotron X-ray diffraction and the mechanical properties were obtained by uniaxial tensile tests.

Investing for keeps: Firms' prepandemic investments in human capital decreased workforce reductions associated with COVID-19 financial pressures.

We examine how firms' prepandemic investments in human capital influence their use of workforce reductions and layoffs (hereafter, workforce reductions) as a response to financial pressures during the coronavirus disease (COVID-19) pandemic. We contend that workforce reductions must be examined in the context of firms' broader financial and resource orchestration environments. First, we suggest that firms' relative exposure to pandemic financial pressures (PFPs) will determine their need to cut costs during the pandemic.

Functional Bionanocomposite Fibers of Chitosan Filled with Cellulose Nanofibers Obtained by Gel Spinning.

Extremely high mechanical performance spun bionanocomposite fibers of chitosan (CHI), and cellulose nanofibers (CNFs) were successfully achieved by gel spinning of CHI aqueous viscous formulations filled with CNFs. The microstructural characterization of the fibers by X-ray diffraction revealed the crystallization of the CHI polymer chains into anhydrous chitosan allomorph. The spinning process combining acidic-basic-neutralization-stretching-drying steps allowed obtaining CHI/CNF composite fibers of high crystallinity, with enhanced effect at incorporating the CNFs.

National Landscape of General Surgery Mock Oral Examination Practices: Survey of Residency Program Directors.

Introduction: Mock oral examinations (MOEs) are used within surgery residency programs to prepare trainees for the American Board of Surgery (ABS) Certifying Exam (CE), but little work exists to guide programs in terms of best practices for implementing a general surgery MOE program. This study, endorsed by the Association for Program Directors in Surgery (APDS) Research Committee, aimed to better understand the national scope of current practices for general surgery MOEs.

Methods: General surgery residency program directors (PDs) were invited via the APDS listserv to complete a 27-item survey about their perceptions of the importance and correlates of MOEs, how their exams are structured, implementation barriers, and recent revisions to their MOE program.

"I would rather be told than not know" - A qualitative study exploring parental views on identifying the future risk of childhood overweight and obesity during infancy.

Background: Risk assessment tools provide an opportunity to prevent childhood overweight and obesity through early identification and intervention to influence infant feeding practices. Engaging parents of infants is paramount for success however; the literature suggests there is uncertainty surrounding the use of such tools with concerns about stigmatisation, labelling and expressions of parental guilt. This study explores parents' views on identifying future risk of childhood overweight and obesity during infancy and communicating risk to parents.