جستجوی مقالات مرتبط با کلیدواژه "lead" در نشریات گروه "میان رشته ای"

One of the most serious problems of the industrialized world is heavy metal contamination. As a heavy metal, lead has very harmful effects on human health even in small amounts. Therefore, removing it from water is one of the most important challenges in public health system. Microorganism application is very useful and safe in this field. Creatures living on Earth are constantly under the influence of gravity, and if it changes, they will be affected by a unique shock. Such a change has effects on the structure and function of cells by interfering with biochemical pathways and gene expression. Investigating these changes, in addition to maintaining the health of astronauts, will also be useful for improving the quality of human life on earth. In this study, the efficiency of Lactobacillus acidophilus ATCC 4356 bacteria in the bioremoval of lead from aqueous solution was investigated in microgravity and Mars gravity conditions. The results showed a decrease in lead concentration after 24-hour treatment by 82.1% under microgravity conditions, 79.6% under simulated Mars gravity conditions and 70.6% under natural Earth gravity conditions. Therefore, by reducing the gravity, it is possible to increase the efficiency of L. acidophilus in the bioremoval of lead metal.

The southern section of the Caspian Sea convexity is included in the Central Alborz, which stretches from Semnan to Qazvin. The Central Alborz zone is the focus of the research because of the strong association between lead and zinc mineralization and tectonics, as well as the great potential of this zone. The major horizons of lead and zinc mineralization, as well as the location of these horizons with orogenic events, have been investigated in this study, based on fieldwork and office studies as well as previous research. According to this research, there are eight lead and zinc mineralization horizons in Central Alborz, ranging from old to recent, including the mineralization horizon of Soltanieh Formation associated with Zaygonin orogeny, the mineralization horizon of Mila Formation associated with Caledonian orogeny, the mineralization horizon of Mubarak Formation With Alborz orogeny, Mineralization horizon of Ruteh Formation related to Hercynian orogeny, Mineralization horizon of Elika Formation related to Early Cimmerian orogeny, Mineralization horizon of Lar Formation related to Middle Cimmerian orogeny, Cretaceous mineralization horizon related to Laramid orogeny and Mineralization within the Karaj Formation is related to the Eocene age in the Pyrenean orogen. According to mathematical modeling in the Central Alborz area, the lead and zinc mineralization controls by thrust faults and reverses-strike slip faults. According to the findings of this study, more than 60% of mineralizations connected to structures occur in the Mesozoic. Triassic mineralizations occurred along with extention tectonics, while Cretaceous mineralizations formed under a compressive regime.