its presence. since then, it has been well established that this trace element is essential for mammals, in particular ruminants, because it favours the rumenal fixation of sulfur, its reduction in sulfide followed by its subsequent oxydation into sulfate. also well known is the antagonism between copper...
rakita exploration and serbia zijin bor copper, subsidiaries of china's zijin mining operating in bor, have donated usd to build the state-of-the-art covid testing laboratory. on april , the donation contract was signed at the palace of serbia in belgrade, with representatives of a state institution...
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