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Effects of imazethapyr spraying on plant growth and leaf surface microbial communities in Arabidopsis thaliana

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Journal of Environmental Sciences 2019年第11期31卷 35-45页

作者： Wanyue Liu Mingjing Ke Zhenyan Zhang Tao Lu Youchao Zhu Yan Li Xiangliang Pan Haifeng Qian State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China College of Environment Zhejiang University of Technology Hangzhou 310032 China

Imazethapyr (IM) is an acetolactate synthase (ALS)-inhibiting herbicide that has been widely used in recent ***,IM spraying can lead to the accumulation of herbicide residues in ***,we determined the effects of IM spraying on the plant growth and leaf surface microbial communities of Arabidopsis thaliana after 7 and 14 days of *** results suggested that IM spraying inhibited plant *** weight decreased to 48% and 26% of the control value after 7 and 14 days,respectively,of 0.035 kg/ha IM *** addition,anthocyanin content increased 9.2-fold and 37.2-fold relative to the control content after 7 and 14 days of treatment,***,IM spraying destroyed the cell structures of the leaves,as evidenced by increases in the number of starch granules and the stomatal closure *** in photosynthetic efficiency and antioxidant enzyme activity were observed after IM spraying,especially after 14 days of *** diversity and evenness of the leaf microbiota were not affected by IM treatment,but the composition of community structure at the genus level was altered by IM *** application increased the abundance of Pseudomonas,a genus that includes species pathogenic to plants and humans,indicating that IM potentially increased the abundance of pathogenic bacteria on *** findings increase our understanding of the relationships between herbicide application and the microbial community structures on plant leaves,and they provide a new perspective for studying the ecological safety of herbicide usage.

关键词： Herbicides Imidazolinones Arabidopsis thaliana 16S rRNA gene Phyllosphere microorganisms

Effect of leachate recycle and inoculation on microbial characteristics of municipal refuse in landfill bioreactors

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Journal of Environmental Sciences 2001年第4期13卷 508-513页

作者： Shen, D.-s. He, R. Ren, G.-p. Traore, I. Feng, X.-s. Dept. of Environment and Resource Zhejiang University Hangzhou 310029 China

Population development of key groups of anaerobic and aerobic bacteria involved in municipal refuse decomposition under laboratory landfill bioreactors with and without leachate recycle and inoculation was measured since modeling municipal refuse was landfilled in bioreactors for about 210 days. Hydrolytic fermentative bacteria (HFB), hydrogen-producing acetogenic bacteria (HPAB), methane-producing bacteria (MPB), sulfate-reducing bacteria (SRB), anaerobic and aerobic cellulolytic bacteria and denitrabacteria were enumerated by the most probable number technique. The results showed that the dominant microorganism groups were the methanogenic bacteria including hydrolytic fermentative, hydrogen-producing acetogenic and methane-producing bacteria. They were present in fresh refuse but at low values and positively affected by leachate recycle and refuse inoculation. The amounts of HFB or HPAB in digesters D4 and D5 operated with inoculation and leachate recycle reached their maximum values of 1010 - 1012 cells/g dry refuse for HFB or 105 - 106 cells/g dry refuse for HPAB on day 60, in digester D3 operated with leachate recycle on day 120 for HFB (109 cells/g dry refuse) or on day 90 for HPAB (105 cells/g dry refuse), and in digesters D1 and D2 on day 210 for HFB (109 cells/g dry refuse) or on day 90 for HPAB (104 - 106 cells/g dry refuse). The population of methane-producing bacteria in digesters D4 and D5 sharply increased on days 60 and 90 respectively, however in digesters D1, D2 and D3 on day 120. Leachate recycle and inoculation changed the cellulolytic microorganisms composition of refuse ecosystem, the higher amounts of anaerobic cellulolytic bacteria were measured in digesters D4 and D5 (107 cells/g dry refuse), followed by digesters D3 (106 cells/g dry refuse), D2 or D1 (104 cells/g dry refuse). However, the amounts of aerobic cellulolytic bacteria were much lower than that of anaerobic cellulolytic bacteria. And it was higher in digesters D3 than those in dig

关键词： Bacteria Bioreactors Fermentation Hydrolysis Land fill microorganisms

Predicting Microbe-Disease Association Based on Heterogeneous Network and Global Graph Feature Learning

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Chinese Journal of Electronics 2022年第2期31卷 345-353页

作者： WANG Yueyue LEI Xiujuan PAN Yi School of Computer Science Shaanxi Normal University Department of Computer Science Georgia State University Faculty of Computer Science and Control Engineering Shenzhen Institute of Advanced TechnologyChinese Academy of Sciences

Numerous microbes inhabit human body,making a vast difference in human health. Hence, discovering associations between microbes and diseases is beneficial to disease prevention and treatment. In this study,we develop a prediction method by learning global graph feature on the heterogeneous network(called HNGFL).Firstly, a heterogeneous network is integrated by known microbe-disease associations and multiple *** on microbe Gaussian interaction profile(GIP) kernel similarity, we consider different effects of these microbes on organs in the human body to further improve microbe similarity. For disease similarity network, we combine GIP kernel similarity, disease semantic similarity and disease-symptom similarity. And then, an embedding algorithm called GraRep is used to learn global structural information for this network. According to vector feature of every node, we utilize support vector machine classifier to calculate the score for each microbe-disease pair. HNGFL achieves a reliable performance in cross validation, outperforming the compared methods. In addition, we carry out case studies of three diseases. Results show that HNGFL can be considered as a reliable method for microbe-disease association prediction.

关键词： microorganisms global graph feature learning support vector machines patient diagnosis global structural information disease semantic similarity disease-symptom similarity HNGFL pattern classification graph theory microbe Gaussian interaction profile kernel similarity bioinformatics support vector machine classifier GraRep diseases learning (artificial intelligence) microbe-disease association prediction heterogeneous network Gaussian processes GIP kernel similarity

Microbial biodegradation of plastics: Challenges, opportunities, and a critical perspective

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Frontiers of Environmental Science & Engineering 2022年第12期16卷 133-154页

作者： Shilpa Nitai Basak Sumer Singh Meena Department of Biotechnology Dr.B.R.Ambedkar National Institute of Technology JalandharPunjab144027India

The abundance of synthetic polymers has increased due to their uncontrolled utilization and disposal in the *** recalcitrant nature of plastics leads to accumulation and saturation in the environment,which is a matter of great *** exponential rise has been reported in plastic pollution during the corona pandemic because of PPE kits,gloves,and face masks made up of single-use *** physicochemical methods have been employed to degrade synthetic polymers,but these methods have limited efficiency and cause the release of hazardous metabolites or by-products in the *** species,isolated from landfills and dumpsites,have utilized plastics as the sole source of carbon,energy,and biomass *** involvement of microbial strains in plastic degradation is evident as a substantial amount of mineralization has been ***,the complete removal of plastic could not be achieved,but it is still effective compared to the preexisting traditional ***,microbial species and the enzymes involved in plastic waste degradation could be utilized as eco-friendly ***,microbial biodegradation approaches have a profound scope to cope with the plastic waste problem in a cost-effective and environmental-friendly ***,microbial degradation can be optimized and combined with physicochemical methods to achieve substantial *** review summarizes the different microbial species,their genes,biochemical pathways,and enzymes involved in plastic biodegradation.

关键词： Plastic-waste Polymers Health-hazards Biodegradation microorganisms Enzymes

Thin-layer heap bioleaching of copper flotation tailings containing high levels of fine grains and microbial community succession analysis

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International Journal of Minerals,Metallurgy and Materials 2017年第4期24卷 360-368页

作者： Xiao-dong Hao Yi-li Liang Hua-qun Yin Hong-wei Liu Wei-min Zeng Xue-duan Liu School of Minerals Processing and Bioengineering Central South University Changsha 410083 China Key Laboratory of Biometallurgy of Ministry of Education Central South University Changsha 410083 China

Thin-layer heap bioleaching of copper flotation tailings containing high levels of fine grains was carried out by mixed cultures on a small scale over a period of 210 d. Lump ores as a framework were loaded at the bottom of the ore heap. The overall copper leaching rates of tailings and lump ores were 57.10wt% and 65.52wt%, respectively. The dynamic shifts of microbial community structures about attached microorganisms were determined using the Illumina MiSeq sequencing platform based on 16S rRNA amplification strategy. The results indicated that chemolithotrophic genera Acidithiobacillus and Leptospirillum were always detected and dominated the microbial community in the initial and middle stages of the heap bioleaching process; both genera might be responsible for improving the copper extraction. However, Thermogymnomonas and Ferroplasma increased gradually in the final stage. Moreover, the effects of various physicochemical parameters and microbial community shifts on the leaching efficiency were further investigated and these associations provided some important clues for facilitating the effective application of bioleaching. © 2017, University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg.

关键词： Bioleaching Copper Flotation Leaching microorganisms RNA Tailings

Advances in single-cell sequencing technology in microbiome research

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Genes & Diseases 2024年第4期11卷 201-219页

作者： Yinhang Wu Jing Zhuang Yifei Song Xinyi Gao Jian Chu Shuwen Han Huzhou Central Hospital Affiliated Central Hospital Huzhou UniversityHuzhouZhejiang 313000China Key Laboratory of Multiomics Research and Clinical Transformation of Digestive Cancer of Huzhou HuzhouZhejiang 313000China The Fifth Affiliated Clinical Medical College of Zhejiang Chinese Medical University HangzhouZhejiang 313000China Zhejiang Provincial People's Hospital and Affiliated People's Hospital Hangzhou Medical CollegeHangzhouZhejiang 310000China

With the rapid development of histological techniques and the widespread applica-tion of single-cell sequencing in eukaryotes,researchers desire to explore individual *** and functional expression,which deepens our understanding of *** this review,the history of the development of microbial detection technologies was revealed and the difficulties in the application of single-cell sequencing in microorganisms were dissected as ***,the characteristics of the currently emerging microbial single-cell sequencing(Microbe-seq)technology were summarized,and the prospects of the application of Microbe-seq in microorganisms were distilled based on the current development *** its mature development,the Microbe-seq technology was still in the optimization stage.A retrospective study was conducted,aiming to promote the widespread application of single-cell sequencing in microorganisms and facilitate further improvement in the technol-ogy.

关键词： Bacterialantibiotic resistance Host immunity Host-phage interaction Microbial single-cell sequencing microorganisms Single cell Single-cell sequencing technology

Adsorbability of Mycobacterium phlei on hematite surface

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Journal of University of Science and Technology Beijing 2007年第2期14卷 103-106页

作者： Huifen Yang Qiang Zhang Zhuan Jiang Civil and Environmental Engineering School University of Science and Technology Beijing Beijing 100083 China

The adsorption of microorganisms on the mineral surface is the base of microorganisms that are considered as mineral processing reagents. The principles of the use of a highly hydrophobic and negatively charged bacterium, Mycobacterium phlei, as a flocculating-flotating agent for finely divided hematite were investigated. The flocculating-floating recovery is strongly dependent on the pH and the dosage of the bacterium. Generally the pH should be controlled over the range of 5.5-7, and the dosage should be controlled about 16 mg/L. The infrared spectrometry analysis indicates that the six functional groups of M. phlei, substituted aromatic compound groups, -（CH2） n-groups, -CH2（-CH3） groups, carbonyl groups, aromatic hydrocarbon groups, and carboxyl groups, are on the hematite surface, among which the first five ones contribute physical adsorption and only the carboxyl groups provide chemisorption. Microscopic analysis reveals that the dimensions and tight aggregation degree of the flocs of hematite particles formed by M. phlei are also impacted by the pH and the content of M. phlei in flotation.

关键词： microorganisms mycobacterium phlei hematite flocculation flotation infrared spectrometry microscopic analysis physical adsorption chemisorption

Impact of Land Degradation on Soil Microbial Biomass and Activity in Northeast Brazil

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Pedosphere 2012年第1期22卷 88-95页

作者： J.S.NUNES A.S.F.ARAUJO L.A.P.L.NUNES L.M.LIMA R.F.V.CARNEIRO A.A.C.SALVIANO S.M.TSAI Soil Quality Lab. Agricultural Science CenterFederal University of PiauíTeresinaPI(Brazil) Center of Nuclear Energy in Agriculture University of Sao PauloPiracicabaSP(Brazil)

Land degradation causes great changes in the soil biological *** process of degradation may decrease soil microbial biomass and consequently decrease soil microbial *** study was conducted out during 2009 and 2010 at the four sites of land under native vegetation(NV),moderately degraded land(LDL),highly degraded land(HDL) and land under restoration for four years(RL) to evaluate changes in soil microbial biomass and activity in lands with different degradation levels in comparison with both land under native vegetation and land under restoration in Northeast *** samples were collected at 0-10 cm *** organic carbon(SOC),soil microbial biomass C(MBC) and N(MBN),soil respiration(SR),and hydrolysis of fluorescein diacetate(FDA) and dehydrogenase(DHA) activities were *** two years of evaluation,soil MBC,MBN,FDA and DHA had higher values in the NV,followed by the *** decreases of soil microbial biomass and enzyme activities in the degraded lands were approximately 8-10 times as large as those found in the ***,after land restoration,the MBC and MBN increased approximately 5-fold and 2-fold,respectively,compared with the *** results showed that land degradation produced a strong decrease in soil microbial ***,land restoration may promote short-and long-term increases in soil microbial biomass.

关键词： land restoration microorganisms soil quality soil respiration

Effects of reduced nitrogen and suitable soil moisture on wheat(Triticum aestivum L.) rhizosphere soil microbiological,biochemical properties and yield in the Huanghuai Plain,China

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Journal of Integrative Agriculture 2020年第1期19卷 234-250页

作者： ZHOU Su-mei ZHANG Man ZHANG Ke-ke YANG Xi-wen HE De-xian YIN Jun WANG Chen-yang College of Agronomy Henan Agricultural UniversityZhengzhou 450002P.R.China Institute of Plant Nutrient and Environmental Resources Henan Academy of Agricultural SciencesZhengzhou 450002P.R.China

Soil management practices affect rhizosphere microorganisms and enzyme activities, which in turn influence soil ecosystem processes. The objective of this study was to explore the effects of different nitrogen application rates on wheat(Triticum aestivum L.) rhizosphere soil microorganisms and enzyme activities, and their temporal variations in relation to soil fertility under supplemental irrigation conditions in a fluvo-aquic region. For this, we established a split-plot experiment for two consecutive years(2014–2015 and 2015–2016) in the field with three levels of soil moisture: water deficit to no irrigation(W1), medium irrigation to(70±5)% of soil relative moisture after jointing stage(W2), and adequate irrigation to(80±5)% of soil relative moisture after jointing stage(W3);and three levels of nitrogen: 0 kg ha^–1(N1), 195 kg ha^–1(N2) and 270 kg ha^–1(N3). Results showed that irrigation and nitrogen application significantly increased rhizosphere microorganisms and enzyme activities. Soil microbiological properties showed different trends in response to N level;the highest values of bacteria, protease, catalase and phosphatase appeared in N2, while the highest levels of actinobacteria, fungi and urease were observed in N3. In addition, these items performed best under medium irrigation(W2) relative to W1 and W3;particularly the maximum microorganism(bacteria, actinobacteria and fungi) amounts appeared at W2, 5.37×10^7 and 6.35×10^7 CFUs g^–1 higher than those at W3 in 2014–2015 and 2015–2016, respectively;and these changes were similar in both growing seasons. Microbe-related parameters fluctuated over time but their seasonality did not hamper the irrigation and fertilization-induced effects. Further, the highest grain yields of 13 309.2 and 12 885.7 kg ha^–1 were both obtained at W2 N2 in 2014–2015 and 2015–2016, respectively. The selected properties, soil microorganisms and enzymes, were significantly correlated with wheat yield and proved to be valuable ind

关键词： suitable soil moisture nitrogen-reduction rhizosphere soil microorganisms rhizosphere soil enzyme activity winter wheat(Triticum aestivum L.)