The COVID-19 pandemic continues to have a devastating effect on the health and well-being of the global population. A vital step in the combat towards COVID-19 is a successful screening of contaminated patients, with one of the key screening approaches being radiological imaging using chest radiography. This study aimed to automatically detect COVID-19 pneumonia patients using digital chest x-ray images while maximizing the accuracy in detection using deep convolutional neural networks (DCNN). The dataset consists of 864 COVID-19, 1345 viral pneumonia and 1341 normal chest x-ray images. In this study, DCNN based model Inception V3 with transfer learning have been proposed for the detection of coronavirus pneumonia infected patients using chest X-ray radiographs and achieved more than 96% accuracy. The results demonstrate that transfer learning proved to be effective, showed robust performance and easily deployable approach for COVID-19 detection.

Three N-substituted selenium-bridged diiron complexes [{(mu-SeCH2)2NC6H4R}Fe2(CO)6] (R = 4-NO2, 7; R = H, 8; R = 4-CH3, 9) were firstly prepared as biomimetic models for the Fe-Fe hydrogenases active site. Models could be generated by the convergent reaction of [(mu-HSe)2Fe2(CO)6] (6) with N,N-bis(hydroxymethyl)-4-nitroaniline (1), N,N-bis(hydroxymethyl)aniline (2), and N,N-bis(hydroxymethyl)-4-methylaniline (3) in 46-52% yields. All the new complexes were characterized by IR, 1H and 13C NMR and HRMS spectra and their molecular structures were determined by single-crystal X-ray analysis. The redox properties of and their dithiolate analogues [{(mu-SCH2)2NC6H4R}Fe2(CO)6] (R = 4-NO2, 7s; R = H, 8s; R = 4-CH3, 9s ) were evaluated by cyclic voltammograms. The electrochemical proton reduction by and were investigated in the presence of p-toluenesulfonic acid (HOTs) to evaluate the influence of changing the coordinating S atoms of the bridging ligands to Se atoms on the electrocatalytic activity for proton reduction.

A nanocomposite drug delivery system (Ti3C2@Met@CP) can be used for the synergistic treatment of tumors through photothermal/photodynamic/chemotherapy and can also inhibit tumor recurrence and metastasis by activating the immune system.

Silkworm fibers have attracted widespread attention for their superb glossy texture and promising mechanical performance.