Ting Ma

Hohai University, Nan-ching, Jiangsu Sheng, China

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Publications (4)6.25 Total impact

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    ABSTRACT: Submerged aquatic macrophytes are an important part of the lacustrine ecosystem. In this study, the bacterial community compositions in the rhizosphere sediments from three kinds of submerged macrophytes (Ceratophyllum demersum, Potamogeton crispus, and Vallisneria natans) were investigated to determine whether submerged macrophytes could drive the variation of bacterial community in the eutrophic Taihu Lake, China. Molecular techniques, including terminal restriction fragment length polymorphism (T-RFLP) of PCR-amplified 16S rRNA gene and clone libraries, were employed to analyze the bacterial community compositions. Remarkable differences of the T-RFLP patterns were observed among the different samples, and the results of LIBSHUFF analysis also confirmed that the bacterial community compositions in the rhizosphere sediments of three kinds of submerged macrophytes were statistically different from that of the unvegetated sediment. Acidobacteria, Deltaproteobacteria, and Betaproteobacteria were the dominant bacterial groups in the rhizosphere sediments of Ceratophyllum demersum, Potamogeton crispus, and Vallisneria natans, respectively, accounting for 15.38%, 29.03%, and 18.00% of the total bacterial abundances. Our study demonstrated that submerged macrophytes could influence the bacterial community compositions in their rhizosphere sediments, suggesting that macrophytes have an effect on the cycling and transportation of nutrients in the freshwater lake ecosystem.
    Canadian Journal of Microbiology 04/2013; 59(4):237-44. DOI:10.1139/cjm-2012-0554 · 1.22 Impact Factor
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    ABSTRACT: Bacteria are crucial components in lake sediments and play important role in various environmental processes. Urban lakes in the densely populated cities are often small, shallow, highly artificial and hypereutrophic compared to rural and natural lakes and have been overlooked for a long time. In the present study, bacterial community compositions in surface sediments of three urban lakes (Lake Mochou, Lake Qianhu and Lake Zixia) in Nanjing City, China, were investigated using the terminal restriction fragment length polymorphism (T-RFLP) of PCR-amplified 16S rRNA gene and clone libraries. Remarkable differences in the T-RFLP patterns were observed in different lakes or different sampling stations of the same lake. Canonical correspondence analysis indicated that total nitrogen (TN) had significant effects on bacterial community structure in the lake sediments. Chloroflexi were the most dominant bacterial group in the clone library from Lake Mochou (21.7 % of the total clones) which was partly associated with its higher TN and organic matters concentrations. However, Bacteroidetes appeared to be dominated colonizers in the sediments of Lake Zixia (20.4 % of the total clones). Our study gives a comprehensive insight into the structure of bacterial community of urban lake sediments, indicating that the environmental factors played a key role in influencing the bacterial community composition in the freshwater ecosystems.
    World Journal of Microbiology and Biotechnology (Formerly MIRCEN Journal of Applied Microbiology and Biotechnology) 08/2012; 28(11):3159-70. DOI:10.1007/s11274-012-1126-y · 1.78 Impact Factor
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    ABSTRACT: To investigate the effects of lake water chemistry on bacterioplankton community composition, three different sized lakes (Lake Taihu, Lake Zixia and Lake Pipa) were studied. Denaturing gradient gel electrophoresis (DGGE) of 16S rRNA, followed by clone library analysis was used to explore the bacterial community structure in lake water. Cluster analysis of DGGE patterns indicated that bacterioplankton community compositions within one lake were similar. Canonical correspondence analysis (CCA) was carried out to interpret the response of the bacterial community structure to water chemistry. Sampling lakes and total phosphorus were two variables found to significantly correlate with DGGE patterns. Clone library analysis results indicated that the bacterioplankton community composition of three lakes differed markedly, even at the phylum and subphylum levels. The results of the homologous and heterologous coverage curves analysis based on the LIBSHUFF program also showed significant differences among the three clone libraries.
    African journal of microbiology research 12/2011; 5:4820-4831. · 0.54 Impact Factor
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    ABSTRACT: End points of reproductive toxicity were investigated in male mice (Mus musculus, ICR) fed Nanjing City tap water for 90 days. There was no significant alteration in body weights between treatment and control mice. In treated mice, flow cytometry analysis of testicular tissue indicated that the relative percentage of the elongated spermatid (HC) decreased significantly (P < 0.05). Also slight increases in the relative percentage of round spermatids (1C) and primary spermatocytes (4C) were noted. The ratios of 4C:2C (diploid germ cells) and 1C:2C increased, and testicular histopathology indicated an expansion of interstitial space and a decreased number and size of Leydig cells in treated mice. The current study suggests that Nanjing City tap water is toxic to the reproductive system of mice and additional study to evaluate its effects on other species, including human beings, would be warranted.
    Ecotoxicology 03/2011; 20(5):1057-64. DOI:10.1007/s10646-011-0644-y · 2.71 Impact Factor