Journal of Microbiology

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The impact of acid mine drainage on nitrogen-fixing microorganisms in rice root zone soil: Shengni Tian, Penghui Zhang, Qin Zhang, Yupeng Chen, Caijuan Sun, Dan Huang, Wenye Zhang, Mingzhu Zhang; J. Microbiol. 2026;64(1):e2505004. Published online January 31, 2026; DOI: https://doi.org/10.71150/jm.2505004

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Abstract PDF Supplementary Material: Acid mine drainage (AMD) poses a serious threat to rice paddy ecosystems, yet its impact on the composition and dynamics of soil nitrogen-fixing microorganisms remains poorly understood. In this study, a pot experiment was conducted using paddy soil collected from a mining area under three pollution treatments, to analyze changes in the structure of the nitrogen-fixing microbial community across different growth stages and treatments. The results showed that AMD irrigation led to soil acidification, sulfate accumulation, and a significant reduction in the diversity of nitrogen-fixing microorganisms in the root zone. Compared to the control, the Shannon index decreased by 11.65–24.79% in contaminated soil. LEfSe analysis indicated that AMD enriched metal-tolerant and sulfate-resistant microbial taxa. Irrigation with clean water was insufficient to fully restore the soil environment. The assembly process of the AMD soil community was governed solely by stochastic processes, indicating structural instability of the community. This study suggests that remediation strategies should prioritize neutralizing acidity and restoring nutrient balance to support the stability and recovery of nitrogen-fixing microorganisms. These findings provide new insight into how AMD disrupts diazotrophic community assembly, with direct implications for paddy soil restoration.

Journal Articles

Potential of 2, 2'-dipyridyl diselane as an adjunct to antibiotics to manage cadmium-induced antibiotic resistance in Salmonella enterica serovar Typhi Ty2 strain: Praveen Rishi , Reena Thakur , Ujjwal Jit Kaur , Harjit Singh , Kuldip K. Bhasin; J. Microbiol. 2017;55(9):737-744. Published online August 5, 2017; DOI: https://doi.org/10.1007/s12275-017-7040-0

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One of the reasons for increased antibiotic resistance in Salmonella enterica serovar Typhi Ty2 is the influx of heavy metal ions in the sewage, from where the infection is transmitted. Therefore, curbing these selective agents could be one of the strategies to manage the emergence of multidrug resistance in the pathogen. As observed in our earlier study, the present study also confirmed the links between cadmium accumulation and antibiotic resistance in Salmonella. Therefore, the potential of a chemically-synthesised compound 2, 2􍿁-dipyridyl diselane (DPDS) was explored to combat the metal-induced antibiotic resistance. Its metal chelating and antimicrobial properties were evidenced by fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FE-SEM), and microbroth dilution
method
. Owing to these properties of DPDS, further, this compound was evaluated for its potential to be used in combination with conventional antibiotics. The data revealed effective synergism at much lower concentrations of both the agents. Thus, it is indicated from the study that the combination of these two agents at their lower effective doses might reduce the chances of emergence of antibiotic resistance, which can be ascribed to the multi-pronged action of the agents.

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Assessment of antimicrobial resistant bacteria and antimicrobial resistance genes in hospital, pharmaceutical and agricultural settings in Lagos state, Nigeria
Abraham AJAYI, Emelda CHUKWU, Utibeima U. ESSIET, Jacob YISAU, Kazeem OSUOLALE, Rufai ABUBAKAR, Paschal EZEOBI, Jane OKWUZU, Babatunde ADEWALE, Babatunde SALAKO, Ganiyu O. OYETIBO, Yewande A. TOBUN, Saheed T. ADEOTI, Rasheed MACAULAY, Ayokunle OMILEYE, Ra
Minerva Biotechnology and Biomolecular Research.2025;[Epub] CrossRef
Interference of sodium alginate and 2,2’-bipyridyl on bacterial growth and biofilm produced by Staphylococcus aureus isolates from bovine mastitis
Ana Caroline Batista Nunes, Danillo Sales Rosa, Naiana Braga Freire, Antônio Wilton Cavalcante Fernandes, Renata de Faria Silva Souza, Gisele Veneroni Gouveia, Hugo Colombarolli Bonfá, Mateus Matiuzzi da Costa
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A NiCoT family metal transporter of Mycobacterium tuberculosis (Rv2856/NicT) behaves as a drug efflux pump that facilitates cross-resistance to antibiotics
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Microbiology .2022;[Epub] CrossRef
Heavy metal-induced selection and proliferation of antibiotic resistance: A review
Prakriti Vats, Ujjwal Jit Kaur, Praveen Rishi
Journal of Applied Microbiology.2022; 132(6): 4058. CrossRef
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Cr(VI) removal from aqueous solution by thermophilic denitrifying bacterium Chelatococcus daeguensis TAD1 in the presence of single and multiple heavy metals: Han Li , Shaobin Huang , Yongqing Zhang; J. Microbiol. 2016;54(9):602-610. Published online August 31, 2016; DOI: https://doi.org/10.1007/s12275-016-5295-5

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Abstract PDF

Cr(VI) pollution is increasing continuously as a result of ongoing industrialization. In this study, we investigated the thermophilic denitrifying bacterium Chelatococcus daeguensis TAD1, isolated from the biofilm of a biotrickling filter used in nitrogen oxides (NOX) removal, with respect to its ability to remove Cr(VI) from an aqueous solution. TAD1 was capable of reducing Cr(VI) from an initial concentration of 10 mg/L to non-detectable levels over a pH range of 7–9 and at a temperature range of 30–50°C. TAD1 simultaneously removed both Cr(VI) and NO3 −-N at 50°C, when the pH was 7 and the initial Cr(VI) concentration was 15 mg/L. The reduction of Cr(VI) to Cr(III) correlated with the growth metabolic activity of TAD1. The presence of other heavy metals (Cu, Zn, and Ni) inhibited the ability of TAD1 to remove Cr(VI). The metals each individually inhibited Cr(VI) removal, and the extent of inhibition increased in a cooperative manner in the presence of a combination of the metals. The addition of biodegradable cellulose acetate microspheres (an adsorption material) weakened the toxicity of the heavy metals; in their presence, the Cr(VI) removal efficiency returned to a high level. The feasibility and applicability of simultaneous nitrate removal and Cr(VI) reduction by strain TAD1 is promising, and may be an effective biological method for the clean-up of wastewater.

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Qian Liu, Xun Liao, Yancheng Li, Meiqi Zhang, Jiang Li
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Microbial Strategies for the Removal of Hexavalent Chromium from Wastewater: Recent Advances and Future Prospects
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Water, Air, & Soil Pollution.2025;[Epub] CrossRef
Hexavalent Chromium Pollution and its Sustainable Management through Bioremediation
Anushka Paul, Sudeshna Dey, Deo Karan Ram, Alok Prasad Das
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Adsorption of Hg2+/Cr6+ by metal-binding proteins heterologously expressed in Escherichia coli
Shuting Hu, Zixiang Wei, Teng Liu, Xinyu Zuo, Xiaoqiang Jia
BMC Biotechnology.2024;[Epub] CrossRef
Growth-dependent cr(VI) reduction by Alteromonas sp. ORB2 under haloalkaline conditions: toxicity, removal mechanism and effect of heavy metals
G. Kiran Kumar Reddy, K. Kavibharathi, Anuroop Singh, Y. V. Nancharaiah
World Journal of Microbiology and Biotechnology.2024;[Epub] CrossRef
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Akanksha Gupta, Anubhuti Singh, Virendra Kumar Mishra
Water, Air, & Soil Pollution.2023;[Epub] CrossRef
Chromium Toxicity in Plants: Signaling, Mitigation, and Future Perspectives
Sajad Ali, Rakeeb A. Mir, Anshika Tyagi, Nazia Manzar, Abhijeet Shankar Kashyap, Muntazir Mushtaq, Aamir Raina, Suvin Park, Sandhya Sharma, Zahoor A. Mir, Showkat A. Lone, Ajaz A. Bhat, Uqab Baba, Henda Mahmoudi, Hanhong Bae
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A comprehensive review on chromium (Cr) contamination and Cr(VI)-resistant extremophiles in diverse extreme environments
Zeeshanur Rahman, Lebin Thomas, Siva P. K. Chetri, Shrey Bodhankar, Vikas Kumar, Ravi Naidu
Environmental Science and Pollution Research.2023; 30(21): 59163. CrossRef
Health hazards of hexavalent chromium (Cr (VI)) and its microbial reduction
Pooja Sharma, Surendra Pratap Singh, Sheetal Kishor Parakh, Yen Wah Tong
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Qiang An, Shu-man Deng, Bin Zhao, Zheng Li, Jia Xu, Jia-Li Song
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Dong-Wook Hyun, Hojun Sung, Pil Soo Kim, Ji-Hyun Yun, Jin-Woo Bae
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Research Support, Non-U.S. Gov't

Removal of Heavy Metals by an Enriched Consortium: Eun Young Lee , Joung Soo Lim , Kyung Hwan Oh , Jae Yeon Lee , Seog Ku Kim , Yoo Kyung Lee , Keun Kim; J. Microbiol. 2008;46(1):23-28.; DOI: https://doi.org/10.1007/s12275-007-0131-6

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Abstract PDF

An enriched consortium obtained from lake-sediment was developed for the removal of heavy metals such as Cu, Pb, Cr, Ni, and Zn from heavy metal-contaminated water. The removal efficiency of heavy metals in a shaking condition was generally higher than that in the static state. After the fifteenth enrichment with assorted heavy metals, the removal efficiencies in the shaking and static condition at an average concentration of 100 mg/L of each heavy metal were approximately 99~100% and 95~100%, respectively, depending on the type of heavy metal. An aerobically grown, pure culture isolated from an enriched culture was analyzed by 16S rRNA sequencing and identified as Ralstonia sp. HM-1. This strain was found to remove various heavy metals with an efficiency of approximately 97~100% at an average concentration of 200 mg/L of each heavy metal.

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Synergistic microbial consortia in the bioremediation of heavy metal-contaminated wastewater: mechanisms and sustainability perspectives
Arpita Chakraborty, Priyajit Banerjee, Nimai Chandra Saha, Palash Kumar Pal
Environmental Geochemistry and Health.2026;[Epub] CrossRef
A comparative investigation on the inhibition kinetics of bioaccumulation of As(III) and As(V) ions using Bacillus arsenicus MTCC 4380
Mousumi Saha Podder, Chandrajit B. Majumder
Ecohydrology & Hydrobiology.2017; 17(2): 148. CrossRef
Effect of pH on soil bacterial diversity
Sun-Ja Cho, Mi-Hee Kim, Young-Ok Lee
Journal of Ecology and Environment.2016;[Epub] CrossRef
Simultaneous sequestration of ternary metal ions (Cr6+, Cu2+ and Zn2+) from aqueous solution by an indigenous bacterial consortium
Subhajit Majumder, Vedansh Gupta, Smita Raghuvanshi, Suresh Gupta
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Bacterial Color Response to Hexavalent Chromium, Cr^6+: Ka Hong Cheung , Ji-Dong Gu; J. Microbiol. 2002;40(3):234-236.

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Abstract PDF: A blue pigment-producing bacterium, Vogesella indigofera, was isolated and quantified for the relationship between its synthesis of a blue pigment and exposure concentrations of Cr^6+ . The concentration of Cr^6+ and the percentage of blue colonies on agar plates was negatively correlated (r^2 = -0.8683). Critical concentrations inhibiting bacterial pigment production were found to be between 100-150 ug Cr^6+ /ml on agar plates and 200-300 ug Cr^6+ /ml in liquid culture. As the blue color is characteristic and easily observable, the bacterium Vogesella indigofera may have potential applications in the detection and monitoring of environmental pollution.

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