Five different soil rhizosphere samples were collected from the following medicinal plants: Heliotropium pterocarpum, Euphorbia cuneata, Dracaena ombet, Balanites aegyptiaca and Prosopis juliflra located in HalayebShalateen region, Egypt. Physico-chemical characterization of these soil was performed. Also, six microbial DNA extraction protocols (A-F) including hexadecylmethylammonium bromide (CTAB) and sodium docdeylsulfate (SDS)- based methods were compared for these soil. Moreover, Phospholipid Fatty Acid (PLFA) analysis was applied to characterize the microbial community structure of these samples. Consequently, this work provides rapid microbial DNA extraction and precipitation method and biodiversity evaluation of microbial community structure in the samples.

It is a kind of enhanced oil recovery technology with good use value and application prospect. It can obviously improve the oil recovery after flood drive. In order to investigate the effect of polymer flooding What kind of chemical agent alternately can make the best effect of flooding, the highest economic efficiency, carried out the gel and chemical agent into the indoor optimization experiment. Firstly, the effect of gelation of polymer and polymer, surfactant and binary compound system on the experiment was studied. The results showed that the gelation of the gel was similar to that of the binary composite system And the cost and economic benefits of the three chemicals were compared. The results showed that the ratio of gel to polymer was higher than that of the polymer, and the optimum pore volume was 0.35 ~ 0.5PV, to guide the scene of the remaining oil after the polymer to further tap the potential.

Twenty AGR (wild African giant pouched rat) comprising of ten males and ten females were used for this study. The average weight of twenty adult African giant rats was observed to be 1058.42 ± 37.79g. The average weight of male and female AGR were observed to be 1210.00 ± 56.70g and 911.11 ± 24.50g respectively. The weight showed sexual dimorphism with the male significantly higher than the female. Gross anatomy and morphological studies of the parathyroid glands of the African giant rat revealed that parathyroid glands were two pairs situated in the lateral and inferior in position to the thyroid gland. Histological studies showed that the parathyroid glands were richly supplied with blood and the chief cells were abundant and arranged in form of cords throughout the glands. The chief cells were positive when stained with periodic acid Schiff (PAS) stain which showed that glycoprotein was present. Oxyphil cells were also present and were observed to be bigger and fewer than the chief cells.