Archaeal and bacterial diversity in hot springs on the Tibetan Plateau, China

Extremophiles ◽  
2011 ◽  
Vol 15 (5) ◽  
pp. 549-563 ◽  
Author(s):  
Qiuyuan Huang ◽  
Christina Z. Dong ◽  
Raymond M. Dong ◽  
Hongchen Jiang ◽  
Shang Wang ◽  
...  
2021 ◽  
pp. 1-50
Author(s):  
Xiaoquan Chen ◽  
Fengcun Xing ◽  
Shu Jiang ◽  
Yongchao Lu ◽  
Zhongrong Liu ◽  
...  

Using fresh cores samples, we determined the origin and formation process of Eocene lacustrine dolomites in the Tibetan Plateau through petrological, mineralogical, and geochemical analyses. Dolomitic rocks were collected from the upper member of Eocene Niubao Formation in the Lunpola Basin, and consist of dolomitic mudstone, argillaceous dolomite, dolomite-bearing mudstone and mud-bearing dolomite. These dolomites are dominated by aphanotopic and micro-crystalline dolomites, with minor amounts of euhedral or subhedral powder- and fine-crystalline dolomites. Carbon and oxygen stable isotopes, combined with ubiquitous gypsum in study area, indicates a semi-saline continental lake under strong evaporative conditions. The revealed relatively high temperature of dolomitization(33.8°C–119.1°C), combined with hydrothermal minerals such as cerous phosphate and barite, reflect the participation of dolomite from hot fluids. Moreover, the inferred dolomitization temperatures decrease gradually toward the centre of the lake basin, suggesting the resurgence of hydrothermal fluids along a fault zone on the lake margin. This proves that frequent thermal events occurred at the boundary fault of the Lunpola Basin margin during early Himalayan orogenesis. In addition, Jurassic carbonates interacting with hydrothermal fluids, as well as strong evaporation conditions, likely provided favourable conditions for the formation of primary lime sediments. A rich source of Mg2+ brought by volcanic ash, hydrothermal fluids, and the Jurassic carbonates then created conditions for dolomitization during the depositional period. Strong evaporation under a relatively hot climate enhanced penecontemporaneous dolomitization, thus forming dolomite. Tibetan Plateau was under arid to semi-arid climate conditions, and there was a widespread distribution of dolostones in western, central, and northern China during the Eocene period. The hydrothermal dolomites of the upper Niubao Formation testify for active hot springs, while lacustrine dolomite imply arid or semi-arid climates during the Eocene, in the early stages of Himalayan orogenesis.


2019 ◽  
Vol 62 (5) ◽  
pp. 853-862
Author(s):  
Keshao Liu ◽  
Tandong Yao ◽  
Yongqin Liu ◽  
Baiqing Xu ◽  
Anyi Hu ◽  
...  

2009 ◽  
Vol 26 (2) ◽  
pp. 131-145 ◽  
Author(s):  
Yongqin Liu ◽  
Tandong Yao ◽  
Liping Zhu ◽  
Nianzhi Jiao ◽  
Xiaobo Liu ◽  
...  

PLoS ONE ◽  
2013 ◽  
Vol 8 (5) ◽  
pp. e62901 ◽  
Author(s):  
Shang Wang ◽  
Weiguo Hou ◽  
Hailiang Dong ◽  
Hongchen Jiang ◽  
Liuqin Huang ◽  
...  

2013 ◽  
Vol 59 (4) ◽  
pp. 245-251 ◽  
Author(s):  
Yu-Zhi Miao ◽  
Hui Xu ◽  
Bao-Jin Fei ◽  
Dai-Rong Qiao ◽  
Yi Cao

Phytases play a very important role in increasing phytate digestion and reducing phosphorus pollution in the environment, and phytate-degrading bacteria have a ubiquitous distribution in the environment. Due to its extremely harsh environment, the Tibetan Plateau breeds possibly abundant, extreme microorganisms. In this research, 67 phytate-degrading bacteria were isolated from different habitats in the Tibetan Plateau. Among all isolates, 40.3% were screened from farmland, 25.3% from wetland, 4.5% from saline–alkaline soil, 7.5% from hot springs, and 22.4% from lawns, which showed that the distribution of the phytate-degrading bacteria varied with habitats. By the PCR–RFLP method, 16 different species were identified and named, 4 of which are reported for the first time as phytate-degrading bacteria, that is, Uncultured Enterococcus sp. GYPB01, Bacillaceae bacterium strain GYPB05, Endophytic bacterium strain GYPB16, and Shigella dysenteria strain GYPB22. Through the assay of phytase activity of 16 strains, Klebsiella sp. strain GYPB15 displayed the highest capability of phytase production. Through analysis of the optimum pH, the optimum temperature, and the thermal stability of enzyme from 16 strains, some especial phytate-degrading bacteria were obtained. Our findings clearly indicate a good relation between the composition of the soils from the different environments in the Tibetan Plateau and populations of cultivable phytate-degrading bacteria. Moreover, extreme harsh soils are logically the best soils in which to find some strains of phytate-degrading bacteria for exploiting in the fields of biotechnology and industry.


Malacologia ◽  
2016 ◽  
Vol 59 (2) ◽  
pp. 313-320 ◽  
Author(s):  
Parm Viktor von Oheimb ◽  
Lukas Landler ◽  
Katharina C. M. von Oheimb

2004 ◽  
Vol 49 (3) ◽  
pp. 269-275 ◽  
Author(s):  
S. R. Xiang ◽  
T. D. Yao ◽  
L. Z. An ◽  
B. Q. Xu ◽  
Z. Li ◽  
...  

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