No abstract

Antibacterial air filtration membranes are essential for personal protection during the pandemic of coronavirus disease 2019 (COVID-19). However, high-efficiency filtration with low pressure drop and effective antibiosis is difficult to achieve. To solve this problem, an innovative electrospinning system with low binding energy and high conductivity was built to enhance the jet splitting, and a fluffy nanofibrous membrane containing numerous ultrafine nanofibers and large quantities of antibacterial agents was achieved, which was fabricated by electrospinning polyamide 6 (PA6), poly­(vinyl pyrrolidone) (PVP), chitosan (CS), and curcumin (Cur). The filtration efficiency for 0.3 μm NaCl particles was 99.83%, the pressure drop was 54 Pa, and the quality factor (QF) was up to 0.118 Pa–1. CS and Cur synergistically enhanced the antibacterial performance; the bacteriostatic rates against Escherichia coli and Staphylococcus aureus were 99.5 and 98.9%, respectively. This work will largely promote the application of natural antibacterial agents in the development of high-efficiency, low-resistance air filters for personal protection by manufacturing ultrafine nanofibers with enhanced antibiosis.

IntroductionIn recent years, assisted reproductive technology (ART) has developed rapidly, leading to an increasing number of clinical practice guidelines in this field. However, the reporting quality of current clinical practice guidelines in ART is still unknown. Objective To evaluate the reporting quality of clinical practice guidelines in the field of ART using the RIGHT checklist. Method Relevant guidelines were identified by electronic search of PubMed, Chinese Biomedical Literature Database (CBM), Wan Fang Database and Chinese National Knowledge Infrastructure (CNKI) from the beginning of the database to October, 2017. We also searched the websites of the guideline development organizations, including Guidelines International Network (GIN), National Guideline Clearinghouse (NGC) and the National Institute for Health and Care Excellence (NICE), as well as from two medical associations, including the European Society of Human Reproduction and Embryology (ESHRE) and the American Society for Reproductive Medicine (ASRM). We used Google Scholar to find additional clinical practice guidelines (CPGs) as well. Two investigators searched the database, selected guidelines independently based on the inclusion criteria, and extracted the relevant information.Result Fifteen guidelines (i.e. six developed by individual institutions and 9 by associations) were included. On average, 12.7 out of 35 items in the RIGHT standard (36.3%) were reported in each guideline. Five items were not reported by any of these guidelines. The reporting proportion of the seven domains (i.e. Basic information; Background; Evidence; Recommendations; Review and quality assurance; Funding and declaration and management of interests; Other information) were 46.7%, 40.8%, 45.3%, 29.5%, 53.3%, 10.0%, 26.7%, respectively. ConclusionAt present, the reporting quality of guidelines for ART is poor, especially regarding the funding. In the future guideline development, more consideration should be given to reporting, dissemination and implementation.

It has been a challenging task to manage perishable food supply chains because of the perishable product's short lifetime, the possible spoilage of the product due to its deterioration nature, and the retail demand uncertainty. All of these factors can lead to a significant amount of shortage of food items and a substantial retail loss. The recent development of tracing and tracking technologies, which facilitate effective monitoring of the inventory level and product quality continuously, can greatly improve the performance of food supply chain and reduce spoilage waste. Motivated by this recent technological advancement, our research aims to investigate the joint decision of pricing strategy, shelf space allocation, and replenishment policy in a single-item food supply chain setting, where our goal is to maximize the retailer's total expected profit subject to stochastic retail demand. We prove the existence of optimality for the design of the perishable food supply chain. We then extend the single-item supply chain problem to a multi-item setting and propose an easy-to-implement searching algorithm to produce the optimal allocation of shelf space among these items for practical implementation. Finally, we provide numerical examples to demonstrate the effectiveness of our solution.