نتایج جستجو برای: semifinite trace
تعداد نتایج: 67149 فیلتر نتایج به سال:
غربالگری، جداسازی و بررسی خصوصیات بیوشیمیایی آنزیم کیتیناز مقاوم به دما حاصل از باکتری های بومی کشور
کیتین n(c8h13o5n ) دومین پلیمر مهم از نظر فراوانی درجهان است. کیتین از پیش ساز فعالudp-n- acetylglucoseamine به وسیله آنزیم کیتین سینتاز، سنتز می شود. مقدار کیتین از سخت پوستان در کل محیط های دریایی 1560 میلیون تن تخمین زده شده است. اسکلت خارج سلولی سخت پوستان (پوسته خرچنگ، لابستر ومیگو) به طور متداول از اصلی ترین منابع زیستی کیتین می باشد. میکروارگانیسم ها اولین تجزیه کننده های کیتین در طبیعت ...
The deployment of vehicle location services generates increasingly massive trajectory data, which incurs high storage and transmission costs. A range studies target offline compression to reduce the cost. However, enable online such as real-time traffic monitoring, it is attractive also costs by being able compress streaming trajectories in real-time. Hence, we propose a framework called TRACE ...
a host of nutrients are needed by cattle to support functions associated with life, and to grow, reproduce, and nourish their offspring (i.e., produce milk). a vast amount of resources have been expended to quantify the amounts of specific nutrients needed to perform these function so that economically efficient diets can be formulated. feeding diets that provide adequate, but not excessive, am...
the concentration contents of ca, mg, sr and zn in porites corals from pulau langkawi, pulau redang and pulau tioman were presented. the corals were cleaned and the growth rate examined visually. the growth rate of porites in malaysia waters was between 5 to 25 mm yr-1 and each band was selected for determining the metal contents using the atomic absorption spectrophotometer (aas). the mean val...
there have been much speculation and debate concerning the effect of electromagnetic fields (emf) on body systems. various reports have implicated excessive exposure to emf to certain forms of leukemia. it has also been reported that emf may cause alteration in the levels of certain macro- and micro-nutrients such as copper, zinc, selenium, calcium and iron. we have undertaken this study to det...
this research aims to monitor the trace elements content (cr, cu, pb, cd, ag, al, mn, mg, zn and fe) in the tissues of the muscle and liver of silver carp (h. molitrix ) and stone moroko (p. parva) from zarivar wetland in western iran. this research was cross-sectional. the research specimen was fish caught from zarivar wetland. metal concentration analysis was carried out utilizing an icp. ...
this study assesses the effect of major trace metals levels in wastewater discharges and sedimentfrom twenty four permanent and five semi-permanent wastewater drain outlets into the kuwait coast. theeffect of trace metals levels released from untreated wastewater discharges to euchelus asper, gastropod was also determined. results showed high trace metal levels in e. asper tissues, followed by ...
the kashkan formation (paleocene to middle eocene), consists of conglomerate, sandstone, and siltstone in the zagros folded zone, southwest iran. type of the sedimentary facies, architectural elements and trace fossils show that kashkan deposits were formed in a low sinuosity braided stream system, with north to south flow direction. the formation displays coarsening-upward succession reflects ...
There were no considerable up to date on the trace element requirements of commercial poultry in recent years in despite of the progress in their performance traits. One of the more prevalent problems in modern broiler production system which could be attributed to the trace mineral inadequacy is skeletal disorders. Zinc, is an essential trace element which acts as a co-factor in several metalo...
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