نتایج جستجو برای: ground pumice
تعداد نتایج: 143043 فیلتر نتایج به سال:
Background : The contamination of nitrate (NO3−) in potable water has become a serious concern in many parts of the world. Increasing nitrate concentrations in drinking water causes two adverse health effects: induction of “blue-baby syndrome” (methemoglobinemia), especially in infants, and the potential formation of carcinogenic nitrosamines. The objective of this study was to investigate th...
background: the use of alternative disinfectants and the control of natural organic material are two approaches that are typically applied in water treatment utilities to reduce the formation of chlorinated disinfection by-products in recent years. catalytic ozonation as a new technology is used to promote the efficiency of the single ozonation processes. the purpose of this study was to invest...
Bacterial contamination of four commonly used dental materials Dr. M. Ghavam* - Dr. M. Aligholi** *- Associate Professor of Operative Dentistry Dept. - Faculty of Dentistry – Tehran University of Medical Sciences. **- The member of Microbiology Dept. Faculty of Medicine – Tehran University of Medical Sciences. Background and Aim: Bacterial contamination of dental materials and devices used in d...
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