نتایج جستجو برای: pumice powder
تعداد نتایج: 47653 فیلتر نتایج به سال:
The soils of the central Oregon pumice plateau are relatively young and infertile, yet support an array of plant diversity and growth in the region’s pine forests. Whether these coarsetextured, pumice and ash soils are resilient to forest disturbance is not well understood. We present results from a long-term experiment that examined changes in soil quality in response to combinations of thinni...
In this study, Remazol Yellow (RR) removal was investigated by Saccharomyces cerevisiae immobilized on pumice stone. For the immobilization process, a new technic was used and immobilization matrix HCl pretreated pumice stone was added to the growth medium of microorganism. pH, initial biosorbent (Co), and dye concentration (Cb) effect on biosorption were optimized thr...
زمینه و هدف: هدف از این مطالعه، بررسی و تحقیق بر روی یک ماده گیاهی (seidlitzia rosmarinus) ساخت گروه تحقیقاتی طب سنتی دانشگاه شاهد، به منظور یافتن جایگزینی ایمن تر برای مخلوط اسید- ابرزیو در تکنیک میکروابرژن بود، تا درصورت دست یابی به نتایج موفقیت آمیز، بتوانیم استفاده روتین از آن را توصیه نماییم. روش بررسی: در این مطالعه که به صورت کارآزمایی بالینی بود، 72 دندان متعلق به 9 بیمار در سه گروه 1...
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...
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