Polyacrylonitrile Composites Blended with Asphalt as a Low-Cost Material for Producing Synthetic Fibers: Rheology and Thermal Stability.

The results of rheological studies and thermal analysis of polymer compositions based on polyacrylonitrile copolymers (PAN) of different molecular weights and asphalt isolated by n-pentane solvent deasphalting are presented. It was found that the asphalt content in mixtures with PAN at the level of 10-30 wt.% improves the rheological properties of the polymer composite melt.

Symptoms in healthcare professionals infected with SARS-CoV-2 at a university hospital.

Introduction: Healthcare professionals are among the main risk groups for novel coronavirus disease (COVID 19). The identification of respiratory symptoms is important in the clinical assumption of infection, but it may be asymptomatic or paucisymptomatic.

Objectives: To compare the proportion of professionals with symptoms suggestive of COVID-19 who tested positive for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) with the proportion of positive asymptomatic professionals with high-risk contact; and to identify respiratory and non-respiratory symptoms of professionals with suspected COVID-19 and the proportion of those who tested positive for SARS CoV-2.

Structural Rearrangements of Carbonic Anhydrase Entrapped in Sol-Gel Magnetite Determined by ATR-FTIR Spectroscopy.

Enzymatically active nanocomposites are a perspective class of bioactive materials that finds their application in numerous fields of science and technology ranging from biosensors and therapeutic agents to industrial catalysts. Key properties of such systems are their stability and activity under various conditions, the problems that are addressed in any research devoted to this class of materials. Understanding the principles that govern these properties is critical to the development of the field, especially when it comes to a new class of bioactive systems.

Design of lead-free BCZT-based ceramics with enhanced piezoelectric energy harvesting performances.

The design of lead-free ceramics for piezoelectric energy harvesting applications has become a hot topic. Among these materials, BaCaZrTiO (BCZT) and BaTiSnO (BTSn) are considered as potential candidates due to their enhanced piezoelectric properties. Here, the structural, electrical, piezoelectric and piezoelectric energy harvesting properties of the (1 - )BaCaZrTiO-BaTiSnO (BTSn, = 0.

DiZyme: Open-Access Expandable Resource for Quantitative Prediction of Nanozyme Catalytic Activity.

Enzymes suffer from high cost, complex purification, and low stability. Development of low-cost artificial enzymes of comparative or higher effectiveness is desired. Given its complexity, it is desired to presume their activities prior to experiments.