Journal Articles
- Metagenomic analysis reveals the prevalence and persistence of antibiotic- and heavy metal-resistance genes in wastewater treatment plant
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Sachin Kumar Gupta , Hanseob Shin , Dukki Han , Hor-Gil Hur , Tatsuya Unno
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J. Microbiol. 2018;56(6):408-415. Published online June 1, 2018
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DOI: https://doi.org/10.1007/s12275-018-8195-z
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Abstract
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The increased antibiotic resistance among microorganisms
has resulted into growing interest for investigating the wastewater
treatment plants (WWTPs) as they are reported to be
the major source in the dissemination of antibiotic resistance
genes (ARGs) and heavy metal resistance genes (HMRGs)
in the environment. In this study, we investigated the prevalence
and persistence of ARGs and HMRGs as well as bacterial
diversity and mobile genetic elements (MGEs) in influent
and effluent at the WWTP in Gwangju, South Korea,
using high-throughput sequencing based metagenomic approach.
A good number of broad-spectrum of resistance
genes (both ARG and HMRG) were prevalent and likely
persistent, although large portion of them were successfully
removed at the wastewater treatment process. The relative
abundance of ARGs and MGEs was higher in effluent as compared
to that of influent. Our results suggest that the resistance
genes with high abundance and bacteria harbouring
ARGs and MGEs are likely to persist more through the treatment
process. On analyzing the microbial community, the
phylum Proteobacteria, especially potentially pathogenic species
belonging to the genus Acinetobacter, dominated in
WWTP. Overall, our study demonstrates that many ARGs
and HMRGs may persist the treatment processes in WWTPs
and their association to MGEs may contribute to the dissemination
of resistance genes among microorganisms in the
environment.
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Citations
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- Potential of 2, 2'-dipyridyl diselane as an adjunct to antibiotics to manage cadmium-induced antibiotic resistance in Salmonella enterica serovar Typhi Ty2 strain
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Praveen Rishi , Reena Thakur , Ujjwal Jit Kaur , Harjit Singh , Kuldip K. Bhasin
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J. Microbiol. 2017;55(9):737-744. Published online August 5, 2017
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DOI: https://doi.org/10.1007/s12275-017-7040-0
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Abstract
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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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Citations
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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
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Han Li , Shaobin Huang , Yongqing Zhang
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J. Microbiol. 2016;54(9):602-610. Published online August 31, 2016
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DOI: https://doi.org/10.1007/s12275-016-5295-5
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56
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Abstract
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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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Research Support, Non-U.S. Gov'ts
- Pb Tolerance and Bioaccumulation by the Mycelia of Flammulina velutipes in Artificial Enrichment Medium
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Changwei Zhu , Zhengpeng Li , Decai Li , Yan Xin
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J. Microbiol. 2014;52(1):8-12. Published online January 4, 2014
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DOI: https://doi.org/10.1007/s12275-014-2560-3
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50
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5
Crossref
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Abstract
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Mushrooms have the ability to accumulate high concentrations
of heavy metals, which gives them potential for use as
bioremediators of environmental contamination. The Pb2+
tolerance and accumulation ability of living mycelia of Flammulina
velutipes were studied in this work. Mycelial growth
was inhibited when exposed to 1 mM Pb2+. The colony diameter
on solid medium decreased almost 10% compared
with the control. Growth decreased almost 50% when the
Pb2+ concentration increased to 4 mM in the medium, with
the colony diameter decreasing from 80 mm to 43.4 mm,
and dry biomass production in liquid cultures decreasing
from 9.23±0.55 to 4.27±0.28 g/L. Lead ions were efficiently
accumulated in the mycelia. The amount of Pb2+ in the mycelia
increased with increasing Pb2+ concentration in the
medium, with the maximum concentration up to 707±91.4
mg/kg dry weight. We also show evidence that a large amount
of the Pb2+ was adsorbed to the mycelial surface, which may
indicate that an exclusion mechanism is involved in Pb
tolerance. These results demonstrate that F. velutipes could
be useful as a remediator of heavy metal contamination because
of the characteristics of high tolerance to Pb2+ and efficient
accumulation of Pb2+ ions by the mycelia.
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Citations
Citations to this article as recorded by

- An Approach to Evaluate Pb Tolerance and Its Removal Mechanisms by Pleurotus opuntiae
Priyanka Yadav, Vartika Mishra, Tejmani Kumar, Awadhesh Kumar Rai, Ayush Gaur, Mohan Prasad Singh
Journal of Fungi.2023; 9(4): 405. CrossRef - Detrimental and essential elements in fruiting bodies of wild-growing fungi Coprinus comatus, Flammulina velutipes, and Armillaria ostoyae
Jan Vondruška, Jan Šíma, Marek Kobera, Lukáš Rokos, Martin Šeda, Lubomír Svoboda
Journal of Environmental Science and Health, Part B.2022; 57(4): 243. CrossRef - Waste apple wood: A safe and economical alternative substrate for the cultivation of Pleurotus ostreatus and Lentinula edodes
Guorong Yu, Xinxin Li, Shengting Zhao, Shuguang Sun, Yanru Yu, Jinzhi Chen, Xianhao Cheng, Weihuan Li
Folia Horticulturae.2022; 34(2): 173. CrossRef - The effect of different substrates on the growth of six cultivated mushroom species and composition of macro and trace elements in their fruiting bodies
Marek Siwulski, Piotr Rzymski, Anna Budka, Pavel Kalač, Sylwia Budzyńska, Luiza Dawidowicz, Edmund Hajduk, Lidia Kozak, Joanna Budzulak, Krzysztof Sobieralski, Przemysław Niedzielski
European Food Research and Technology.2019; 245(2): 419. CrossRef - Biosorption characteristic of Alcaligenes sp. BAPb.1 for removal of lead(II) from aqueous solution
Yu Jin, Sumei Yu, Chunying Teng, Tao Song, Liying Dong, Jinsong Liang, Xin Bai, Xiuhong Xu, Juanjuan Qu
3 Biotech.2017;[Epub] CrossRef
- Cupriavidus and Burkholderia Species Associated with Agricultural Plants that Grow in Alkaline Soils
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Paulina Estrada-de los Santos , Nora Belinda Vacaseydel-Aceves , Lourdes Martínez-Aguilar , María Antonia Cruz-Hernández , Alberto Mendoza-Herrera , Jesús Caballero-Mellado
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J. Microbiol. 2011;49(6):867-876. Published online December 28, 2011
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DOI: https://doi.org/10.1007/s12275-011-1127-9
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33
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29
Scopus
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Abstract
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The presence of Burkholderia, Cupriavidus, and Ralstonia species in northeastern Mexico was investigated. An analysis of the root surrounding soil from different agricultural plants led to the isolation of Burkholderia and Cupriavidus species but no Ralstonia strains. Most Cupriavidus species were unknown and grouped into two clusters according to ARDRA profiles. The 16S rRNA sequence analysis showed that the Cupriavidus isolates were highly related among them and with different Cupriavidus species with validated names. However, SDS-PAGE profiles were distinct among the different ARDRA profiles and to other Cupriavidus species examined, suggesting new species in the genus. This shows that Cupriavidus is more widely associated with plants than previously appreciated. The BCC isolate was 99% similar to B. cenocepacia by recA sequence analysis. Additionally, most Cupriavidus strains from the two largest groups grew on media containing up to 0.1 mg/ml of copper, 10.0 mg/ml arsenic and 1.0 mg/ml zinc. Burkholderia strains grew on media containing up to 10.0 mg/ml zinc, 5.0 mg/ml arsenic and 0.1 mg/ml copper.
- Functional Characterization of the Copper-Transporting P-Type ATPase Gene of Penicillium janthinellum Strain GXCR
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Hongmin Lai , Changbin Sun , Huaying Tang , Xianwei Fan , Yili Ma
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J. Microbiol. 2009;47(6):736-745. Published online February 4, 2010
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DOI: https://doi.org/10.1007/s12275-009-0074-1
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43
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3
Scopus
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Abstract
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Copper (Cu)-transporting P-type ATPase (CTPA) genes have been documented to play an important role in resistance to heavy metals. However, our understanding of roles of CTPA genes of the filamentous fungi was based only on sequence similarity prediction before. In a previous study, we isolated a Penicillum janthinellum strain GXCR of higher tolerance to Cu (200 mM). In this study, we cloned the partial cDNA of CTPA gene, named PcpA, from the strain GXCR. Sequence alignment indicated that the cloned cDNA sequence has the highest identity (94.4%) with a predictive CTPA gene of Aspergillus clavatus. The PcpA- encoded protein, termed PcpA, has classical functional domains of CTPAs, and shows differences from reported CTPAs in some specific sequence motifs and transmembrane regions. Expression of the PcpA was induced by extracellular Cu, cadmium (Cd), and silver (Ag). PcpA RNA interference (RNAi) mutants with a reduced level of PcpA mRNA were more sensitive to Cu, iron, Cd, and Ag than the wild-type (WT) strain GXCR. When grown in the presence of Cu, iron, and Cd, intracellular Cu and iron contents in the PcpA RNAi mutant were significantly (P<0.05) lower than those in the WT; However, intracellular Cd content in the mutant was significantly (P<0.05) higher than that in the WT. Taken together, it can be concluded that the PcpA functions in Cu uptake and homeostasis, iron uptake, and Cd export from the cytosol to the extracytosol.
- Diversity and Metal Tolerance of Nematode-Trapping Fungi in Pb-Polluted Soils
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Ming-He Mo , Wei-Min Chen , Hao-Ran Yang , Ke-Qin Zhang
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J. Microbiol. 2008;46(1):16-22.
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DOI: https://doi.org/10.1007/s12275-007-0174-8
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40
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16
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Abstract
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The diversity of nematode-trapping fungi (NTF) in two lead (Pb) mines in Yunnan Province, China was investigated in 2004. In total, 20 species belonging to five genera were identified from 500 samples collected at the Lanping and the Huize mines. Pb concentrations ranged from 216~7,150 mg/kg for the former and 132~13,380 mg/kg for the latter, respectively. The fungi were divided into five groups based on different trapping mechanisms. The trapping-net producer group contained the largest number of species, with nine. Two predators, Dactylellina ellipsosporum and Arthrobotrys oligospora, were found at frequencies of 32.85% and 15.41%, respectively. The diversity indexes of NTF were positively correlated with Pb pollution levels in both the Lanping Mine (r=0.66) and the Huize Mine (r=0.72), suggesting that the distribution of NTF was not negatively affected by Pb contamination. For most strains of a given species, there was no significant difference (P>0.01) in the Pb tolerance between the strains isolated from habitats with low or high Pb concentrations. However, Pb toxicity exerted adverse effects on trap formation and predacious capability of fungi. We discuss the possible metal tolerance mechanisms and their relationships to the survival strategy of NTF in Pb-polluted environments.
- Removal of Heavy Metals by an Enriched Consortium
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Eun Young Lee , Joung Soo Lim , Kyung Hwan Oh , Jae Yeon Lee , Seog Ku Kim , Yoo Kyung Lee , Keun Kim
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J. Microbiol. 2008;46(1):23-28.
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DOI: https://doi.org/10.1007/s12275-007-0131-6
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39
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11
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Abstract
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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.
- Heavy Metal Biosorption and its Significance to Metal Tolerance of Streptomycetes
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Jae-young Rho , Jae-heon Kim
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J. Microbiol. 2002;40(1):51-54.
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Abstract
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Heavy metal adsorptions of four streptomycetes were compared with each other. Among the test strains, Streptomyces viridochromogenes showed the most efficient metal binding activity, which was carried out by cell wall as well as freeze-dried mycelium. An order of adsorption potential (zinc > copper > lead > cadmium) was observed in single metal reactions, whereas this adsorption order was disturbed in mixed-metal reactions. The metal adsorption reactions were very fast, pH dependent and culture age-independent, suggestive of a physico-chemical reaction between cell wall components and heavy metal ions. The metal tolerant stains presented the weakest adsorbing activity, indicating that the metal biosorption was not the basis of the metal tolerance.
- Bacterial Color Response to Hexavalent Chromium, Cr^6+
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Ka Hong Cheung , Ji-Dong Gu
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J. Microbiol. 2002;40(3):234-236.
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Abstract
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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.