Nickel-doped willemite-liebenbergite composite pigments synthesis via a precipitation route involving silica hydrogel derived from serpentine minerals and its modification.

A simplified precipitation route involving silica hydrogel produced from serpentine-group minerals has been applied for pigment synthesis through the heat treatment of intermediates precipitated in the liquid phase, including H₂O, NaOH, ZnCl₂, NiCl₂, and the silica hydrogel mentioned. Investigations have shown that this method is applicable for ZnNiSiO compositions when x does not exceed 1.0 and pigments coloration in different blue or green hues is defined by certain proportions of phases crystallized in final products on heating from 900 up to 1200 °C, namely, α-ZnSiO representing nickel-doped willemite, nickel oxide NiO and liebenbergite NiSiO.

Association of depressive symptoms with incidence and mortality rates of COVID-19 over 2 years among healthcare workers in 20 countries: multi-country serial cross-sectional study.

Background: Long-term deterioration in the mental health of healthcare workers (HCWs) has been reported during and after the COVID-19 pandemic. Determining the impact of COVID-19 incidence and mortality rates on the mental health of HCWs is essential to prepare for potential new pandemics. This study aimed to investigate the association of COVID-19 incidence and mortality rates with depressive symptoms over 2 years among HCWs in 20 countries during and after the COVID-19 pandemic.

Inequality on the frontline: A multi-country study on gender differences in mental health among healthcare workers during the COVID-19 pandemic.

Healthcare workers (HCWs) were at increased risk for mental health problems during the COVID-19 pandemic, with prior data suggesting women may be particularly vulnerable. Our global mental health study aimed to examine factors associated with gender differences in psychological distress and depressive symptoms among HCWs during COVID-19. Across 22 countries in South America, Europe, Asia and Africa, 32,410 HCWs participated in the COVID-19 HEalth caRe wOrkErS (HEROES) study between March 2020 and February 2021.

Second language learning role-play: effects of patient and doctor roles on motivation and competence.

Objectives: Role-playing has motivated foreign language learners for decades. In doctor-patient medical consultation role-plays, the doctor role has always been considered an important learning opportunity, whilst the patient role remained obscured. Our study, therefore, had a dual focus.

Stroke care in Armenia: Recent developments.

Introduction: Armenia is an upper-middle-income country with a population of nearly 3 million. Stroke is one of its major public health problems and ranks as the sixth leading cause of death, with a mortality of 75.5 per 100,000.