within the mica group. its approximate chemical formula is k(mg, fe) alsi o (f, oh) . this mineral is usually dark green to brown or black. it can be transparent to opaque, has a vitreous to pearly luster, and a gray-white streak. when weathered, its crystals appear sparkly yellow and are sometimes...
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all these possibilities varna is a natural bridge between europe, asia and africa. it is a large industrialist, transport -, trade -, cultural and scientific center. production profile: the production profile of varna region becomes predominantly determined by metal and mechanical engineering and machine...
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of potential concern, like pvc, which are often criticized as packaging materials. henkel began to remove and avoid the use of pvc in its packaging back in the s. we continue to work toward our goal of fully eliminating pvc from our packaging materials and extend the scope to cover other substances...
fungi may excrete organic compounds which degrade materials, referred to as (bio)chemical dissimilatory biodeterioration (allsopp et al. ). therefore, one of the primary concerns is that without adequate maintenance or treatment to waste disposal units, environmental leakage of highly radioactive substances...