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Diversity and distribution of proteorhodopsin-containing microorganisms in marine environments

Frontiers of Environmental Science & Engineering 2012年第1期6卷 98-106页

作者： Bo WEI School of Life Sciences Xiamen UniversityXiamen 361005China

Proteorhodopsin （PR） is a recently discovered protein involved in the utilization of light energy. Several studies have shown that PR-containing microorganisms are widespread and compose a large proportion of the biomass in marine ecosystems. A better understanding of the ecological role of PR will help clarify the effect of the global flow of energy and the carbon cycle on marine communities. In this study, a bioinformatical database of PR codon sequences, the Global Distribution Database of Proteorhodopsin （GDDP）, as a tool for analyzing the diversity and distribution of PR-containing microorgan- isms in marine environments throughout the world was designed. The community structure of PR microorganisms were also compared using PCR assays and UniFrac analyses of 12 samples collected from three water layers （0, 75, and 200 m） at four representative sites in the Pacific, Atlantic, and Indian Oceans. The results indicate that PR- containing microorganisms can be grouped into two distribution types： widespread and location-specific. Representative cases of the former include SARll-PR and HOT2C01-PR. Interestingly, PR communities cluster by geographic locale but not by water depth.

关键词： proteorhodopsin (PR) microorganism com- munity diversity marine environments

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Heterotrophic Bacterial Floras in Industrial Area and Unpolluted marine environments around Qingdao

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Journal of Ocean University of Qingdao 2002年第1期1卷 59-62页

作者： DUZongjun LIYun YUDehua WANGXianghong CHENJixiang RobertsonP.A.W AustinB XUHuaishu CollegeofmarineLifeSciences OceanUniversityofQingdaoQingdao266003P.R.China DepartmentofBiologicalSciences Heriot-WattUniversityEdinburghEH144ASUK

From Oct. 1999 to Oct. 2000, the heterotrophic bacterial floras in the industrial marine environment around the Qingdao Power Plant (QPP) and in the unpolluted marine environments were investigated. The results showed that the numbers of the heterotrophic bacteria around QPP were much higher than those in unpolluted environments, and the average numbers in QPP Seawater, QPP Sediment, Unpolluted Seawater and Unpolluted Sediment were 5.4×104cfu(mL) -1, 5.0×105cfug -1, 3.0×102cfu(mL) -1 and 1.3×105cfug -1 respectively. Totally, 118 strains were isolated from QPP and 99 of them were Gram-negative. One hundred and twenty one strains were isolated from the unpolluted environments and 104 of them were Gram-negative. All the Gram-negative bacteria belonged to 13 genera. The distribution of the bacteria was varied in different marine environments. The results showed that the unpolluted marine environments contained much more Vibrio than seawater and sediment around QPP.

关键词： marine environments heterotrophic bacteria bacterial floras Qingdao

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Multilocus Sequence Analysis for Assessment of Phylogenetic Diversity and Biogeography in Thalassospira Bacteria from Diverse marine environments

Multilocus Sequence Analysis for Assessment of Phylogenetic ...

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福建省海洋学会2014年学术年会暨福建省科协第十四届学术年会

作者： Qiliang Lai Yang Liu Jun Yuan Juan Du Liping Wang Fengqin Sun Zongze Shao53 State Key Laboratory Breeding Base of marine Genetic Resources Key Laboratory of marine Genetic Resources Third Institute of Oceanography SOA Key Laboratory of marine Genetic Resources of Fujian Province Collaborative Innovation Center of Deep Sea Biology Collaborative Innovation Center for Exploitation and Utilization of marine Biological Resources

Thalassospira bacteria are widespread andhave been isolated from various marine environments. Less is known about their genetic diversity and biogeography, as well as their role in marine environments, many of them cannot be discriminated merely using the 16 S r RNA gene. To address these issues, in this report, the phylogenetic analysis of 58 strains from seawater and deep sea sediments were carried out using the multilocus sequence analysis(MLSA) based on acsA, aro E, gyrB, mut L, rpo D and trp B genes, and the DNA-DNA hybridization(DDH) and average nucleotide identity(ANI) based on genome sequences. The MLSA analysis demonstrated that the 58 strains were clearly separated into 15 lineages, corresponding to seven validly described species and eight potential novel species. The DDH and ANI values further confirmed the validity of the MLSA analysis and eight potential novel species. The MLSA interspecies gap of the genus Thalassospira was determined to be 96.16-97.12% on the basis of the combined analyses of the DDH and MLSA, while the ANI interspecies gap was 95.76-97.20% based on the DDH analysis. Meanwhile, phylogenetic analyses showed that the Thalassospira bacteria exhibited distribution pattern to a certain degree according to geographic regions. Moreover, they clustered together according to the habitats depth. For short, the phylogenetic analyses and biogeography of the Thalassospira bacteria were systematically investigated for the first time. These results will be helpful to explore further their ecological role and adaptive evolution in marine environments.

关键词： Thalassospira multilocus sequence analysis phylogenetic analysis biogeography marine environments

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The marine environmental evolution in the northern Norwegian Sea revealed by foraminifera during the last 60 ka

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Advances in Polar Science 2021年第3期32卷 210-220页

作者： WANG Weiguo ZHAO Mengwei YANG Jichao XIAO Wenshen WANG Haoyin LIU Yang Third Institute of Oceanography Ministry of Natural ResourcesP.R.C.Xiamen 361005China Pilot National Laboratory for marine Science and Technology Qingdao 266237China Shandong University of Science and Technology Qingdao 266590China State Key Laboratory of marine Geology Tongji UniversityShanghai 200092China School of marine Science and Technology Hainan Tropical Ocean UniversitySanya 572000China School of Earth Sciences Lanzhou UniversityLanzhou 730000China

Both planktonic and benthic foraminifera were identified in a sediment core collected from the northern Norwegian Sea to reconstruct the paleoceanographic evolution since the last *** assemblages and distribution patterns of dominant foraminiferal species with special habitat preferences indicated that three marine environments occurred in the northern Norwegian Sea since 62 ka BP:(1)an environment controlled by the circulation of the North Atlantic Current(NAC);(2)by polynya-related sinking of brines and upwelling of intermediate water surrounding the polynya;(3)by melt-water from Barents Sea Ice Sheet(BSIS).At 62-52.5 ka BP,a period with the highest summer insolation during the last glaciatial period,intensification of the NAC led to higher absolute abundances and higher diversity of foraminiferal *** higher abundance of benthic species Cibicidoides wuellerstorfi indicates bottom water conditions that were well-ventilated with an adequate food supply;however,higher abundances of polar planktonic foraminiferal species Neogloboquadrina pachyderma(sin.)indicate that the near-surface temperatures were still *** mid-late marine Isotope Stage(MIS)3(52.5-29 ka BP),the marine environment of the northern Norwegian Sea alternately changed among the above mentioned three *** 29-17ka BP during the last glacial maximum,the dominant benthic species Bolivina arctica from the Arctic Ocean indicates an extreme cold bottom *** BSIS expanded to its maximum extent during this period,and vast polynya formed at the edge of the ice *** sinking of brines from the formation of sea ice in the polynyas caused upwelling,indicated by the upwelling adapted planktonic species Globigerinita *** 17-10 ka BP,the northern Norwegian Sea was controlled by *** the ablation of BSIS,massive amounts of melt water discharged into the Norwegian Sea,resulting in strong water column stratification,poor ventilation,and an oligotrophic

关键词： Norwegian Sea foraminifera North Atlantic Current Barents Sea Ice Sheet marine environments last glaciation

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Phylogenetic Diversity of the Bacillu spumilus Group and the marine Ecotype Revealed by Multilocus Sequence Analysis

Phylogenetic Diversity of the Bacillu spumilus Group and the...

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福建省海洋学会2014年学术年会暨福建省科协第十四届学术年会

作者： Yang Liu Qiliang Lai Chunming Dong Fengqin Sun Liping Wang Guangyu Li Zongze Shao Key Laboratory of marine Genetic Resources-State Key Laboratory Breeding Base Third Institute of Oceanography of State Oceanic Administration Fujian Provincial Key Laboratory of Marine Genetic Resources

Bacteria closely related to Bacilluspumilus cannot be distinguished from such other species as B. safensis, B. stratosphericus, B. altitudinis and B. aerophilus simply by 16 S r RNA gene sequence. In this report, 76 marine strainswere subjected to phylogenetic analysis based on 7housekeeping genes to understand the phylogeny and biography in comparison with other origins. A phylogenetic tree based on the7 housekeeping genes concatenated in the order of gyr B-rpo B-pyc A-pyr E-mut L-aro E-trp Bwas constructed and compared with trees based on the single genes. All these trees exhibited a similar topology structure with small variations. Our 79 strains were divided into 6 groups from A to F;Group A was the largest and contained49 strains close to B. *** additional two large groups were presented by B. safensis and B. altitudinis. Among the housekeeping genes, gyr B and pyr E showed comparatively better resolution power and may serve as molecular markers to distinguish these closely related strains. Furthermore, arecombinant phylogenetic tree based on the gyr B gene and containing 73 terrestrial and our isolates was constructed to detect the relationship between marine and other sources. The tree clearly showed that the bacteria of marine origin were clustered together in all the large *** contrast, the cluster belonging to B. safensis was mainly composed of bacteriaof terrestrial origin. Interestingly, nearly all the marine isolates were at the top of the tree, indicating the possibility of the recent divergence of this bacterial group in marine *** conclude that B. altitudinis bacteria are the most widely spread of the B. pumilus group in marine environments. In summary, this report provides the first evidence regarding the systematic evolution of this bacterial group, and knowledge of their phylogenetic diversity will help in theunderstanding of theirecological role and distribution in marine environments.

关键词： Bacilluspumilus Bacillusaltitudinis Bacillussafensis MLSA diversity marine environments

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海洋环境下粉煤灰对水泥胶砂力学性能和抗Cl-渗透性能的试验研究

海洋环境下粉煤灰对水泥胶砂力学性能和抗Cl-渗透性能的试验研究

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全国高强与高性能混凝土及其应用专题研讨会

作者：任七华邢华良孟涛浙江大学建筑工程学院浙江大成建设集团有限公司浙江大学建筑工程学院

＜正＞1 引言随着经济的发展,海洋资源日益得到人们的开发,海洋环境下的混凝土建筑物也已越来越多。鉴于经济、资源和安全性因素,提高混凝土结构的耐久性已成为土木工程界研究的重点,海工混凝土结构的防腐工作显得尤为重要。提高海洋环... 详细信息

＜正＞1 引言随着经济的发展,海洋资源日益得到人们的开发,海洋环境下的混凝土建筑物也已越来越多。鉴于经济、资源和安全性因素,提高混凝土结构的耐久性已成为土木工程界研究的重点,海工混凝土结构的防腐工作显得尤为重要。提高海洋环境下混凝土的抗腐蚀性能和耐久性,应主要从改善混凝土的渗透性和孔隙率考虑,这是评价混凝土耐久性的两个主要指标。海洋和近海环境中的海水与大气中均含有可引起钢筋严重锈蚀的Cl-,因此提高

关键词： marine environments Fly ash Semi-immerging and drying circle Flexural strength Compressive strength Chloride diffusion coefficient

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