https://www.selleckchem.com/products/anacardic-acid.html Furthermore, based on the pollution indices, some of sampling sites were critically polluted by abovementioned HMs. For children and adults groups, the THI values in 13 and 97% of sampling sites were more than 1 and the TCR in 7 and 14% of sampling sites were more than 10 , respectively. The farmland soil pollution of the study area by As and Cr were found to be quite serious and dangerous. The findings of this study suggest that further attention should be paid by decision-makers to control the HMs pollution in the agricultural soils of the study area. The findings of this study suggest that further attention should be paid by decision-makers to control the HMs pollution in the agricultural soils of the study area.The wide spectrum of oil industry activities caused soil contaminants, as environmental concern in many areas of the world. Bioremediation of oily soils, as biological approach done by bacteria and fungi, is very important to eliminate this pollution. In this study four different metagenomic protocols for DNA extraction has been tested in order to sequence and identify the native bacterial species involved in remediation of oily soils. In this regard, 3 manual methods and a soil DNA extraction kit are used. In manual protocol, physical processes including the addition of silica beads and freezing samples by liquid nitrogen, chemical methods such as treating the lysozyme, and lysis buffer and proteinase K as biochemical methods were utilized for optimal extraction. Quality and quantity of the extracted DNA analyzed using Agarose gel electrophoresis and Picodrop respectively. Then, the 16S rdna gene of bacteria amplified through universal primer for preparing a genomic library by PCR. Results showed that the highest concentration and quality of extracted DNA was obtained by protocol D which was about 135 μg/ul and 260/230 = 2.2 respectively. Moreover, 500 bp fragment amplified perfectly by using DNA e