A mixed bacterial flora was isolated from the soil of two petroleum-contaminated sites, then cultivated and domesticated in an open environment. The bacteria were used to degrade engine oil in wastewater. The optimum ...A mixed bacterial flora was isolated from the soil of two petroleum-contaminated sites, then cultivated and domesticated in an open environment. The bacteria were used to degrade engine oil in wastewater. The optimum biodegradation conditions for all engine oil concentrations of respectively 489 mg L^-1, 1. 075 mg L^-1 and 2 088 mg L^-1 are bacterial inoculum concentration of 0.1%, temperature at 30 ℃ to 35 ℃, pH 7.0 to 7.5, and rotation at 190 r mia^-1 to 240 r rain^-1. The second-order kinetic model proposed by Quiroga and Sales describes the characteristics of the biodegradation of the engine oil very well. Engine oil concentration barely changes the growth rate of the bacterial consortium. The mixed bacterial flora has a high biodegrading capability for engine oil.展开更多
This work documents a new flora from the Upper Permian Hongshan Formation of Acheng County, Heilongjiang Province, Northwest China. The flora consists of 20 species: Paracalamites sp., Pecopteris tangwangheensis Huang...This work documents a new flora from the Upper Permian Hongshan Formation of Acheng County, Heilongjiang Province, Northwest China. The flora consists of 20 species: Paracalamites sp., Pecopteris tangwangheensis Huang, Callipteris obese Huang, Callipteris shenshuensis Huang, C. tangwangheensis Huang, C. heilongjiangensis Huang, C. zeilleri Zalessky, C. sp., Comia yichunensis Huang, C. tenueaxis Huang, Iniopteris sibirica Zalessky, Supaia teiliensis Huang, Compsopteris tchirkovae Zalessky, C. cf. adzvensis Zalessky, Nilssonia sp. 1, Nil. sp. 2, Taeniopteris cf. densissima Halle, T. cf. nystraemii Halle, T. sp. and Noeggerathiopsis derzavinii Neub. It is dominated by Angara species but mixed with some typical Cathaysian elements. The age of the flora is assigned to late of the Late Permian according to the stratigraphic ranges of the known species and the comparisons of it with the similar floras. The new discovery indicates that the final collision between the North China Plate and Siberian Plate occurred in Late Permian along the Xar Moron River-Changchun-Yanji sutured zone, and the Paleoasian Ocean was finally closed at the end of the Permian.展开更多
The Cathaysla flora, one of the most prominent floras of the Carboniferous and Permian, was mainly distributed In East Asia and was characterized by numerous endemic elements. China Is one of the most Important locali...The Cathaysla flora, one of the most prominent floras of the Carboniferous and Permian, was mainly distributed In East Asia and was characterized by numerous endemic elements. China Is one of the most Important localities of the Cathaysla flora and It ;s also the center of origin of this flora. This paper reviews and discusses the characteristics of the Cathaysla flora and the blogeographlcally mixed Permian Cathayslan-Angaran floras of East Asia. In addition, the formative mechanism of the mixed Permian floras Is also discussed.展开更多
利用变性梯度凝胶电泳(Denaturing Gradient Gel Electrophoresis,DGGE)技术,对混菌发酵及贮藏过程中马克斯克鲁维酵母与乳酸菌之间的相互作用进行分析,进而对整个过程中微生物优势菌群及其稳定性进行跟踪监测。结果表明:混菌发酵及贮...利用变性梯度凝胶电泳(Denaturing Gradient Gel Electrophoresis,DGGE)技术,对混菌发酵及贮藏过程中马克斯克鲁维酵母与乳酸菌之间的相互作用进行分析,进而对整个过程中微生物优势菌群及其稳定性进行跟踪监测。结果表明:混菌发酵及贮藏过程中微生物组成比较稳定,优势菌为嗜热链球菌(Streptococcus thermophilus,ST);发酵过程中,马克斯克鲁维酵母(Kluyveromyces marxianus)的添加对乳酸菌生长起到促进作用,尤其是对保加利亚乳杆菌(Lactobacillus bulgaricus,LB)效果显著,贮藏期间该作用转变为抑制;整个过程乳酸菌的存在对酵母菌的生长具有一定的抑制作用。该研究可为深入探讨乳酸菌与酵母菌共同发酵机理及新型发酵乳制品的开发提供理论基础。展开更多
本试验旨在研究陈香茶菌及枯草芽孢杆菌复合发酵生料豆粕。以酸溶性蛋白含量为主要检测指标,研究陈香茶菌及枯草芽孢杆菌不同培养条件对豆粕固态发酵的影响。结果表明：1）陈香茶菌适宜培养条件为,称取0.5 g陈香茶粉接入装有100 m L马...本试验旨在研究陈香茶菌及枯草芽孢杆菌复合发酵生料豆粕。以酸溶性蛋白含量为主要检测指标,研究陈香茶菌及枯草芽孢杆菌不同培养条件对豆粕固态发酵的影响。结果表明：1）陈香茶菌适宜培养条件为,称取0.5 g陈香茶粉接入装有100 m L马铃薯葡萄糖培养基三角瓶中,28℃静置培养24 h。2）豆粕固态发酵最佳工艺为,10%枯草芽孢杆菌发酵液＋10%陈香茶菌培养液＋10%糖蜜＋10%水＋55%豆粕,在37℃密闭条件下培养3-6 d。通过陈香茶菌及枯草芽孢杆菌复合发酵,能显著改善生料豆粕营养价值,有一定的应用价值。展开更多
基金Funded by the Natural Science Foundation of China (No.40571145).
文摘A mixed bacterial flora was isolated from the soil of two petroleum-contaminated sites, then cultivated and domesticated in an open environment. The bacteria were used to degrade engine oil in wastewater. The optimum biodegradation conditions for all engine oil concentrations of respectively 489 mg L^-1, 1. 075 mg L^-1 and 2 088 mg L^-1 are bacterial inoculum concentration of 0.1%, temperature at 30 ℃ to 35 ℃, pH 7.0 to 7.5, and rotation at 190 r mia^-1 to 240 r rain^-1. The second-order kinetic model proposed by Quiroga and Sales describes the characteristics of the biodegradation of the engine oil very well. Engine oil concentration barely changes the growth rate of the bacterial consortium. The mixed bacterial flora has a high biodegrading capability for engine oil.
基金Support of the National Program on Key Basic Research Project (Grant No. 2006CB701400)
文摘This work documents a new flora from the Upper Permian Hongshan Formation of Acheng County, Heilongjiang Province, Northwest China. The flora consists of 20 species: Paracalamites sp., Pecopteris tangwangheensis Huang, Callipteris obese Huang, Callipteris shenshuensis Huang, C. tangwangheensis Huang, C. heilongjiangensis Huang, C. zeilleri Zalessky, C. sp., Comia yichunensis Huang, C. tenueaxis Huang, Iniopteris sibirica Zalessky, Supaia teiliensis Huang, Compsopteris tchirkovae Zalessky, C. cf. adzvensis Zalessky, Nilssonia sp. 1, Nil. sp. 2, Taeniopteris cf. densissima Halle, T. cf. nystraemii Halle, T. sp. and Noeggerathiopsis derzavinii Neub. It is dominated by Angara species but mixed with some typical Cathaysian elements. The age of the flora is assigned to late of the Late Permian according to the stratigraphic ranges of the known species and the comparisons of it with the similar floras. The new discovery indicates that the final collision between the North China Plate and Siberian Plate occurred in Late Permian along the Xar Moron River-Changchun-Yanji sutured zone, and the Paleoasian Ocean was finally closed at the end of the Permian.
文摘The Cathaysla flora, one of the most prominent floras of the Carboniferous and Permian, was mainly distributed In East Asia and was characterized by numerous endemic elements. China Is one of the most Important localities of the Cathaysla flora and It ;s also the center of origin of this flora. This paper reviews and discusses the characteristics of the Cathaysla flora and the blogeographlcally mixed Permian Cathayslan-Angaran floras of East Asia. In addition, the formative mechanism of the mixed Permian floras Is also discussed.
