Comparing Ammonium and Tetraaminophosphonium Anion-Exchange Membranes Derived from Vinyl-Addition Polynorbornene Copolymers.

Herein, we systematically examined how composition influenced the properties of vinyl addition polynorbornene anion exchange membranes (AEMs) prepared from 5-hexyl-2-norbornene and 5-(4-bromobutyl)-2-norbornene. Copolymerization kinetics revealed that 5-hexyl-2-norbornene is consumed faster than 5-(4-bromobutyl)-2-norbornene, leading to a portion of the chain being richer in bromoalkyl groups. The alkyl halide pendants can then be converted to either trimethylammonium or tetrakis(dialkylamino)phosphonium cations through straightforward substitution with trimethylamine or a tris(dialkylamino)phosphazene.

The Pre-Radiology Internship: Room for Improvement?

Background: A clinical internship is currently required by the American Board of Radiology prior to Radiology residency. The purpose of this investigation is to evaluate practicing radiologists' perspectives on the value of the internship and their recommendations for optimization.

Methods: A five-minute online survey was distributed via email to practicing radiologist members of the American College of Radiology.

Dental team member compliance with personal protective equipment and aerosol-generating procedure recommendations during the COVID-19 pandemic in Israel: An observational study.

Introduction: Coronaviruses which have been responsible for numerous epidemics worldwide, share common transmission modalities and pose a risk within dental clinics. Updated, COVID-19-specific infection control and personal protective equipment (PPE) guidelines for dental settings, including minimizing aerosol-generating procedures (AGPs), were issued by the Israeli Ministry of Health (MoH) in spring 2020. This study investigated dental team members (dentists, dental assistants and hygienists) compliance with MoH recommendations exposed to asymptomatic COVID-19 positive patients.