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More than 0.5 billion tons of late Permian bauxite overlies the karstic topography of the Maokou Formation of western Guangxi in China. Here, we provide new mineralogical, geochemical, Sr–Nd–Pb isotopic, and pyrite S isotope and trace element compositional data for the Pingguo bauxite deposit, aiming to further our understanding of the genesis of Permian bauxite. The Pingguo bauxite contains three...
In order to select and establish an appropriate method for extracting and purifying the microbial total DNA from a meadow soil, seven extraction methods (five direct methods, one indirect method and one commercial kit method) and two purification methods were examined, with the quantity and quality of extracted and purified total DNA compared. The results showed that all the seven methods could extract...
Following the introduction of characteristic of wastewater and correlated project in the Alpine Region, the problems were pointed out which should be noticed in wastewater treatment process selection in this specific area. Some suggestions about key design parameters were proposed, and the Two-stage Bio-contact Oxidation Technology was been selected and applied in wastewater treatment plant in north...
Two strains named W7 and W16 were isolated by liquid enrichment culture from the corn field where atrazine has been chronically applied. Observed by gram stain and SEM, W7 belonged to gram-positive bacteria and the single cell was short bacilliform; W16 belonged to gram-negative bacteria and the single cell was spherical. Through physiological and identification and 16SrDNA sequence analysis, two...
The research chose the alginate sodium and PVA as the materials to immobilize the atrazine degrading bacteria. Four methods were adopted: alginate sodium adsorption method, alginate sodium embedding method, PVA boric cross linking method and PVA freezing method. The degrading effects and the characteristics of the atrazine degrading bacteria in the two materials were studied respectively. The result...
Accumulation of trehalose is suggested to be a critical determinant in improving the stress tolerance of the yeast Saccharomyces cerevisiae. To test the influence of trehalose accumulation on response to freeze stress, we constructed all single and double gene disruption mutants of the trehalase genes ATH1, NTH1 and NTH2 and examined the changes of their trehalose accumulations and their freeze tolerances...
Due to the important physiological functions of GABA, various methods used to produce it. Biotransformation by microorganism cells is a more promising method than others. Among the GABA-producing lactic acid bacteria, one strain with high producing capacity was isolated from Chinese naturally pickled vegetable. The strain is identified as Lactobacillus brevis, and named as L.brevis TCCC13007 based...
This paper is a pilot study on the effect of grass- microorganism combined bioremediation of atrazine contaminated soil. Sorghum hybird sudangrass and ryegrass were selected as two repair grass, and immobilized degrading strain J2 was added into the soil under the indoor pot conditions. When the concentration of atrazine was 20 mg/kg in the soil, grass-microorganism combined bioremediation enjoyed...
The immobilization technology could improve the degradation efficiency and adaptability of bacteria. It is a simple, accurate and safety processing method. The research use alginate sodium embedding method to fix the high efficient atrazine degrading bacteria, research the best immobilized condition of alginate sodium to the atrazine degrading bacteria, provide the theoretical basis for next research...
This paper mainly studies the growth and degradation characteristics of the atrazine degradation strain J2 isolated from the soil collected from the cornfield in northern China with a long history of atrazine application. The growth and the degradation characteristics at different pHs, temperatures and in mediums with different salinity are also studied. The results indicate that: when J2 is inoculated...
This research studied the bioremediation of atrazine polluted soil by atrazine degrading strain J2 which is isolated from the long polluted black glebe in the libratory condition. Inoculated the J2 which OD600 value is 1 into the sterilized soil and non-sterilized soil as 1% ratio (bacterial liquid volume mL /soil weight g) respectively, the atrazine concentration of the soil is 10 mg/Kg. J2 utilized...
The CASS technique was adopted for researching on the treatment of Domestic Sewage. The results showed that, in the stable operation phase of the test and under the conditions of setting operation parameters, the average removal rates of CODcr, BOD5, NH4-N, and TP were respectively 91.7%, 92.2%, 89.5% and 91.09%. The sludge remains highly active, and it had stable bio-facies. Effluent quality met...
Put dead immobilized saccharomyces cerevisiae biomass into column of continuous upflowing reactor. Study the influence of temperature, quantity of saccharomyces cerevisiae in column and initial Cu2+ concentration on Cu2+ adsorption. Determine optimal operating parameters of initial pH values, flow rates and quantities of saccharomyces cerevisiae in column through orthogonal experiment. Analyse adsorption...
This paper studies how chemical modification influences the Saccharomycescerevisiae adsorption on copper ion and the desorption of nitric acid, and carries out infrared spectrum analysis of native, adsorbing and desorbing saccharomyces cerevisiae. Results show that carboxyl and amino group in Saccharomycescerevisiae play an important role in the process of adsorbing Cu(II). The adsorption on Cu(II)...
The distribution and composition of the planktonic algae community in Xi Quanyan reservoir was investigated, it showed the dominant species were diatom and chlorophyta. According to the comprehensive trophic state of the multiple monitoring results of the different sampling points in the entrance, centre and exit of the Xi Quanyan reservoir, calculate the comprehensive trophic state index to gain...
Pyrolysis process of dead beer yeast powder was studied through thermogravimetric analyzer. Cu2+ adsorption mechanism was analysed by SEM and FTIR. The results showed: in thermogravimetric test, TG and DTG figures indicated five pyrolytic stages, weight losting in the third(247degC- 309degC) and fourth(309degC-420degC) stages, most important stages, accounted for 68.3% of total weight losting and...
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