Chalcogenide-based semiconductors have advanced from laboratory curiosities to multifunctional platforms that now underpin water purification, gas conversion, sensor technology and solar-driven fuel generation. Recent surveys have examined these themes in isolation, concentrating either on photocatalysis or on single pollutant classes. The present review offers the first integrative analysis that links adsorption forces, band...

Research on physical activity (PA) and health has a fundamental concern with dose–response relationships. The variables of (1) Frequency, (2) Intensity, (3) Time, and (4) Type (i.e., the FITT principle) have traditionally been used to operationalize the dosage of PA. We consider some limitations of FITT and propose that it can be complemented by the additional variable density (from the German exercise and training variable Be...