نتایج جستجو برای: amalgams
تعداد نتایج: 538 فیلتر نتایج به سال:
Our aim in this paper is to study the concept of stability for acts over monoids and in the process develop a more coherent framework for some of the current techniques and construction used in the homological classification of monoids. We also present some new results relating to torsion free acts over monoids and to the embeddability of semigroup amalgams.
Dental fillings provide a major iatrogenic exposure to xenobiotic compounds due to the high prevalence of surface restorations in developed countries. Experimental data suggest that both amalgams, which contain mercury, and resin-based dental materials cause an impairment of the cellular pro- and anti-oxidant redox balance. The aim of this study was to assess the potential genotoxicity of denta...
• Mercury exposure (blood, urine and hair) in 238 ASGM miners was assessed Colombia. A 55% of the (n = 131) had Hg/methylmercury values hair above EPA threshold. levels amalgam burners were 6 to 8-fold higher than all other miners. Fish intake, burning manipulate significant indicators Hg exposure. Exposure clearly depend on different processing activities carried out ASGM. With aim protecting ...
In a 1985 paper, Berthold J. Maier gave necessary and sufficient conditions for the weak embeddability of amalgams of two nilpotent groups of class two over a common subgroup. Then he derived simpler conditions for some special cases. One of his subsequent results is incorrect, and we provide a counterexample. Finally, we provide a fix for the result. In this note, N2 denotes the variety of nil...
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