In 2017, the World Health Organization and the United Nations Environment Programme formed the Global Alliance to Eliminate Lead Paint.All alliance member countries have pledged to develop control regulations that include lead threshold limits.To improve regulations and demonstrate compliance of paint industry products, it is necessary to have adeq
This article describes the discovery and use of the South American cinchona bark and its main therapeutic (and toxic) alkaloids, quinine and quinidine.Since the introduction of cinchona to Europe in the 17th century, it played a role in treating emperors and peasants and was central to colonialism Cast Iron SMAW and wars.Over those 400 years, the m
Welding wood achieves joints whose strength is comparable with the strength of glued joints.When welding, the top of the dowel is not welded because of the lack of melted lignin.To achieve satisfactory strength of a welded joint, it is necessary to optimize the main welding factors such as interference fit, frequency of dowel rotation, welding dept
At the quantitative level on the basic parameters described body oil in the fertility of the virgin chernozems in zonal-subzonal aspect.The article traces the changes in nitrogen and humus condition at an early stage of development.In terms of reserves of humus and nitrogen chernozems forest steppe and steppe have significant tv control cable diffe