specific elements (cr, al, ca, and si) and loss on ignition (loi) were used for semi-quantitative determination of the normative mineralogical composition of naturally occurring chromium ores in ophiolite complexes. by far the occurring ore minerals are complex both from the mineralogical and chemical viewpoints. the secondary minerals serpentine and cr-containing chlorite (kaemmererite) form n...

The early interest in selenium (Se) focused on its toxicity, but since 1957 it has been recognized as an essential dietary element. The diet is the major Se source and approximately 80% of dietary Se is absorbed, depending on the type of food consumed. In several regions of the world, the content of Se in diets has been estimated as insufficient. The dietary requirement for Se for most species ...

کاهش هزینه‏‌های مرتبط با موجودی از مهم‌ترین استراتژی‌‏های هر بنگاه اقتصادی برای بقا و سوددهی در شرایط رقابتی امروزی است. این راستا مدل‏‌های کلاسیک هزینه‏‌ها مطرح شده‌اند؛ اما کنار مزایای فراوان دارای فرضیه‌های محدودکننده‌ای هستند. پژوهش، یک زنجیره سه­‌سطحی لجستیکی شامل تولیدکننده، توزیع‌‏کننده خرده‏‌فروش نظر گرفته می‏‌شود مسئله بهینه‌سازی مدل توزیع‌کننده موردبررسی قرار می‏‌گیرد. موردنظر، توزیع‏...

Selenium (Se) is considered as an essential element for human body. Selenized probiotic fermented milk drink (DOOGH) as a functional beverage to increase Se available in body. The predominate sugar, protein and mineral ion of Iranian yoghurt drink (DOOGH) are lactose, casein and calcium, respectively. Different levels of  Selenium (2.5 – 3- 3,5-  4 and 4.5) is prepared and its suitability based...

Salt stress is a serious problem facing plant growth and development. Selenium (Se) could improve plant growth and reduced stress. Hence, the aim of this study was to determine whether the Se application could alleviate salinity stress negative effects on Melissa officinalis L. Different salinity levels in this research were control (0), 50, 100 and 200 mM. Simultaneously, sodium selenate (Se) ...