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Featured researches published by Jingjing Du.


Materials Science and Engineering: C | 2013

Inhibition of freshwater algal species by co-culture with two fungi

Yong Jia; Jingjing Du; Hao Fang; Guiying Zhao; Xingjun Tian

Microorganisms have attracted worldwide attention as possible agents for the inhibition of water blooms. Algae can usually be inhibited and degraded directly by fungi. In this study, the effects of Trichaptum abietinum 1302BG and Lopharia spadicea on different freshwater algal species, namely, Microcystis aeruginosa, Chlorella vulgaris, Glenodinium sp., Navicula sp., Cryptomonas ovata, and Euglena gracilis, were detected. After 24h, there was a significant inhibitory effect in all algal cultures with T. abietinum 1302BG, except E. gracilis, and all algal cultures with L. spadicea, except Navicula sp. and E. gracilis. The dried masses of two fungi increased while majority of the algal cells disappeared after 72 h of co-incubation with M. aeruginosa, C. vulgaris, Glenodinium sp., and C. ovata. Thus, the two fungi might inhibit the growth of different freshwater algal species and utilize the algal cells for their growth.


Materials Science and Engineering: C | 2015

Potential of extracellular enzymes from Trametes versicolor F21a in Microcystis spp. degradation.

Jingjing Du; Gaozhong Pu; Chen Shao; Shujun Cheng; Ji Cai; Liang Zhou; Yong Jia; Xingjun Tian

Studies have shown that microorganisms may be used to eliminate cyanobacteria in aquatic environments. The present study showed that the white-rot fungus Trametes versicolor F21a could degrade Microcystis aeruginosa. After T. versicolor F21a and Microcystis spp. were co-incubated for 60h, >96% of Microcystis spp. cells were degraded by T. versicolor F21a. The activities of extracellular enzymes showed that cellulase, β-glucosidase, protease, and laccase were vital to Microcystis spp. degradation in the early stage (0h to 24h), while β-glucosidase, protease, laccase, and manganese peroxidase in the late stage (24h to 60h). The positive and significant correlation of the degradation rate with these enzyme activities indicated that these enzymes were involved in the degradation rate of Microcystis spp. cells at different phases. It suggested that the extracellular enzymes released by T. versicolor F21a might be vital to Microcystis spp. degradation. The results of this study may be used to develop alternative microbial control agents for cyanobacterial control.


Journal of Environmental Sciences-china | 2014

Adaptation of microbial communities to multiple stressors associated with litter decomposition of Pterocarya stenoptera.

Gaozhong Pu; Jingjing Tong; Aimeng Su; Xu Ma; Jingjing Du; Yanna Lv; Xingjun Tian

To understand the further impacts of multiple stressors in freshwater, we investigated the effects of heavy metal (HM, Cu and Zn) and nutrient enrichments (nitrogen and phosphorus, NP) on microbial decomposition of Pterocarya stenoptera litter and the associated extracellular enzyme activities and microbial biomass with microcosms. Results showed that the decomposition rates were slower in the polluted stream waters than those in the unpolluted ones, which corresponded to lower microbial biomass and integrated enzyme activities of cellulose and β-glucosidase. The decomposition rates were accelerated at low HM level, which was associated with the stimulated enzyme activities of hydrolytic enzymes or was stimulated by both NP levels in polluted stream waters. In particular, the hydrolase enzyme activities of microbial communities in polluted stream waters were stimulated by low HM level, suggesting that low HM level-stimulated litter decomposition may be due to the increased enzymatic activities. When microbial communities were exposed to HM and NP simultaneously, the inhibitory effect (in unpolluted stream waters) or the stimulated effect (in polluted stream waters) of low HM concentration was enhanced and attenuated, respectively, which suggests that the NP antagonistic effect against HM toxicity on litter decomposition may contribute to the litter-associated extracellular enzyme activities. These results suggest that the co-occurrence of HM and NP may have antagonistic effects on stream ecosystem functioning.


Current Microbiology | 2014

Dual Roles of Cadaverine-Producing Pseudomonas sp. on Microcystis spp. in Hyper-Eutrophic Water

Jingjing Du; Shujun Cheng; Chen Shao; Yanna Lv; Gaozhong Pu; Xu Ma; Yong Jia; Xingjun Tian

A bacterium isolated from Lake Taihu was identified as Pseudomonas sp. A3CT, which performed different effects on Microcystis spp. Growth of Microcystis flos-aquae and Microcystis aeruginosa was assessed in co-culture with A3CT to determine the stimulatory or inhibitory effects on these toxic, bloom-forming Microcystis strains. Results demonstrated that the impacts of A3CT were species specific. A3CT promoted the growth of M. aeruginosa but inhibited growth of M. flos-aquae. To investigate the cause of this phenomenon, the chemical composition of A3CT exudates and the impact of exposure to A3CT exudates on the two Microcystis species were determined. Results suggested that the observed differential growth responses of the two microalgae to A3CT exposure might be related to two components in A3CT exudates NH4+ and cadaverine. Growth stimulation of M. aeruginosa by A3CT was significantly related to NH4+ concentration. Cadaverine possibly acted as a growth inhibitor of M. flos-aquae. The different effects of cadaverine on growth of the two Microcystis strains suggested that A3CT might play a role in intrageneric succession patterns observed during Microcystis blooms in Lake Taihu.


Ecological Engineering | 2012

The importance of bacteria in promoting algal growth in eutrophic lakes with limited available phosphorus

Guiying Zhao; Jingjing Du; Yong Jia; Yanna Lv; Guomin Han; Xingjun Tian


Applied Soil Ecology | 2014

Effects of sulfuric, nitric, and mixed acid rain on litter decomposition, soil microbial biomass, and enzyme activities in subtropical forests of China

Yanna Lv; Congyan Wang; Yanyan Jia; Wenwen Wang; Xu Ma; Jingjing Du; Gaozhong Pu; Xingjun Tian


Applied Biochemistry and Biotechnology | 2012

A Fungus Capable of Degrading Microcystin-LR in the Algal Culture of Microcystis aeruginosa PCC7806

Yong Jia; Jingjing Du; Fuqiang Song; Guiying Zhao; Xingjun Tian


Applied Soil Ecology | 2015

Insight into the indirect function of isopods in litter decomposition in mixed subtropical forests in China

Yanyan Jia; Yanna Lv; Xiangshi Kong; Xiuqin Jia; Kai Tian; Jingjing Du; Xingjun Tian


Aquatic Ecology | 2013

Growth stimulation of Microcystis aeruginosa by a bacterium from hyper-eutrophic water (Taihu Lake, China)

Jingjing Du; Guiying Zhao; Fangyuan Wang; Dong Zhao; Xiaoxiao Chen; Shuren Zhang; Yong Jia; Xingjun Tian


Ecological Engineering | 2014

Contribution of ambient atmospheric exposure to Typha angustifolia litter decomposition in aquatic environment

Gaozhong Pu; Jingjing Du; Xu Ma; Yanna Lv; Yanyan Jia; Xiuqin Jia; Xingjun Tian

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Yanna Lv

Weifang Medical University

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Yong Jia

Nanjing Normal University

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Xu Ma

Nanjing University

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