pH值与温度对氧化亚铁硫杆菌氧化Fe2+影响的研究

采用自行采集的氧化亚铁硫杆菌(T f)应用于地浸矿山代替双氧水作氧化剂氧化吸附尾液中的Fe²⁺, 研究了温度、pH 值对其氧化Fe²⁺的影响。研究结果表明, T f 氧化Fe²⁺最适宜的温度为30 ℃, 当温度低于7 ℃或高于50 ℃时, 氧化亚铁硫杆菌氧化Fe²⁺速度很慢;T f 氧化Fe²⁺最适宜的pH 为2.0～2.5 。     

植物抗虫基因的研究与应用

综述了抗虫目的基因的分离克隆和转基因抗虫植物的培育这两方面的研究成果和进展,并对植物抗虫基因工程研究和应用中存在的问题及其对策进行了分析和讨论。     

Protective effects of Rad23 protein on ultraviolet damage to HeLa cells

Protein Rad23, a nucleotide excision repair factor, mainly involves in repairing the DNA damage from environment, such as UV light. The function of Rad23 protein involved in DNA damage repair from many environmental factors has been studied extensively, but it is not clear from ultraviolet irradiation. To further investigate the photo-protective function of Rad23 protein on HeLa cells damaged from UV light irradiation, firstly, HeLa cells were irradiated by UV light and incubated with the fusion protein of pCold-Rad23, then the cell viability and apoptosis rate were detected by MTT and Hoechst33342/Pl fluorescent staining, respectively. The results show that the recombinant Rad23 protein can protect the HeLa cells from UV irradiation, and inhibit the apoptosis of HeLa cell by UV irradiation.     

Synthesis and biochemical properties of fluorescent/magnetic bifunctional starch particles

Magnetic starch particles(MSPs) were synthesized in water-in-oil microemulsion at room temperature.MSPs were characterized by transmission electron microscopy(TEM),Fourier transform infrared spectrometry(FTIR),zeta potential system,thermogravimetric analysis(TGA) and vibrating sample magnetometry(VSM).The average diameter of the MSPs was 220 nm,dispersed with well-proportioned size and magnetic resonance,the saturation magnetization was 3.64 A·m2/kg.MSP was coated with poly-L-lysine(PLL),and then the surfac...     

细菌浸铀试验研究

对719矿、753矿和703矿不同类型矿石，进行细菌浸出试验，试验结果表明：753矿和719矿矿石中U^4 ／U^6 和Fe^2 ／Fe^3 比值较大，且含有黄铁矿，用细菌浸出能提高金属浸出率2％～8％，可降低酸耗5％～10％。其中，753矿矿石柱浸试验细菌浸出效果最明显；719矿矿石浸出性能较好，在低酸条件和较短时间内即可达到理想的浸出效果。