Database : MEDLINE
Search on : shewanella and putrefaciens [Words]
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[PMID]: 29422245
[Au] Autor:Zhou LY; Chen S; Li H; Guo S; Liu YD; Yang J
[Ad] Address:State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, PR China.
[Ti] Title:EDDS enhanced Shewanella putrefaciens CN32 and α-FeOOH reductive dechlorination of carbon tetrachloride.
[So] Source:Chemosphere;198:556-564, 2018 May.
[Is] ISSN:1879-1298
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:S,S-ethylenediamine-N,N-disuccinic acid (EDDS) enhanced reductive dissolution of α-FeOOH by Shewanella putrefaciens CN32 (CN32), resulting in formation of surface-bound Fe(II) species (Fe EDDS) to improve reductive dechlorination of carbon tetrachloride (CT). The pseudo-first-order rate constants for bio-reduction extents of α-FeOOH by CN32 in the presence of 1.36 mM EDDS was 0.023 ±â€¯0.0003 d which was higher than without EDDS. The enhancement mechanism of bio-reduction was attributed to the strong complexation ability of EDDS to formed Fe EDDS, which could be better utilized by CN32. The dechlorination kinetic of CT by Fe EDDS (2.016 h ) in the presence of 1.36 mM EDDS was 24 times faster than without EDDS. Chloroform were detected as main products for the degradation of CT. The chemical analyses and morphological observation showed that combination between EDDS and Fe produced Fe EDDS complex, which had a reductive potential of -0.375 V and significantly enhanced CT dechlorination. The results showed that EDDS played an important role in enhancing the bio-reduction of α-FeOOH to accelerate reductive dechlorination of CT.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1802
[Cu] Class update date: 180225
[Lr] Last revision date:180225
[St] Status:In-Process

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[PMID]: 29306131
[Au] Autor:Sharma I; Ghangrekar MM
[Ad] Address:P K Sinha Center for Bioenergy, Indian Institute of Technology, Kharagpur 721302, India.
[Ti] Title:Screening anodic inoculums for microbial fuel cells by quantifying bioelectrogenic activity using tungsten trioxide quantum rods.
[So] Source:Bioresour Technol;252:66-71, 2018 Mar.
[Is] ISSN:1873-2976
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:The aim of this research was to develop a procedure for rapid detection of electrogenic activity of the inoculums using electrochromic tungsten trioxide (WO ) quantum rods, which display blue colouration under an electric field. Optimum dosage of WO and sludge concentration to be used for absorbance measurement were determined to estimate electrogenic activity based on blue colouration. Performance of seven MFCs was evaluated using different volumetric ratios of mixed anaerobic sewage sludge and Shewanella putrefaciens as inoculums. Absorbance of inoculums used in MFCs was measured after addition of optimum dosage of WO and a correlation is established between this absorbance and respective current densities/CE, obtained in MFCs during steady state operation. This correlation of current densities/CE with absorbance of inoculum can be used to select proper inoculum having highest electrogenic activity, and to predict possible current generation of MFCs, even before start-up, based on the electrogenic activity of inoculum used.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1801
[Cu] Class update date: 180218
[Lr] Last revision date:180218
[St] Status:In-Process

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[PMID]: 29369685
[Au] Autor:Zhang Y; Lin H; Wang J; Li M
[Ad] Address:Food Safety Laboratory, Department of Food Science and Engineering, Ocean University of China, Qingdao 266003, People's Republic of China.
[Ti] Title:Characteristics of Two Lysis-Related Proteins from a Shewanella putrefaciens Phage with High Lytic Activity and Wide Spectrum.
[So] Source:J Food Prot;81(2):332-340, 2018 Feb.
[Is] ISSN:1944-9097
[Cp] Country of publication:United States
[La] Language:eng
[Ab] Abstract:Although Shewanella putrefaciens is the specific spoilage organism in most seafood, only seven Shewanella phages have been sequenced and their endolysins have not been reported until now. In this study, we cloned and expressed two lysis-related proteins (Spp64 and Spp62) encoded by phage Spp001, the first sequenced S. putrefaciens phage. Both recombinant proteins showed strong lytic capability toward chilled S. putrefaciens Sp225 and presented a wider activity spectrum compared with bacteriophage Spp001. The enzymatic activity of crude Spp64, Spp62 , and Spp62 -GST can cause decreases of 0.691, 0.674, and 0.685, respectively, as tested through the turbidity reduction assay. Furthermore, purified enzyme Spp64 at concentrations of 537.5 and 4.20 µg/mL was enough to decrease the optical density of chilled S. putrefaciens by 0.881 and 0.492, respectively, within 15 min. The recombinant Spp64 has a peptidase catalytic domain and exhibits high temperature resistance. Moreover, Spp64 displayed superior enzymatic activity in a range of pH values that matches environmental conditions (pH between 5.0 and 10.0), which demonstrates that its application in seafood is feasible. The present work is to our knowledge the first report on lysis-related enzymes encoded in the Shewanella phage. Both proteins presented extraordinary potential to control S. putrefaciens; we hope that these proteins can be developed as novel antibacterial agents in further research.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1801
[Cu] Class update date: 180131
[Lr] Last revision date:180131
[St] Status:In-Data-Review
[do] DOI:10.4315/0362-028X.JFP-17-144

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[PMID]: 29323086
[Au] Autor:Ranjan R; Chowdhary P
[Ad] Address:Department of Surgery, Acharya Shree Bhikshu Government Hospital, New Delhi, India.
[Ti] Title:A rare case of bacteremia in a patient of road traffic accident.
[So] Source:Indian J Pathol Microbiol;60(4):599-600, 2017 Oct-Dec.
[Is] ISSN:0974-5130
[Cp] Country of publication:India
[La] Language:eng
[Ab] Abstract:Shewanella putrefaciens rarely causes human infection. These are mostly found in environment and food stuffs. Shewanella are often found in mixed culture. It has been implicated in cellulitis, otitis media, and septicemia. It may be found in respiratory tract, urine, feces, and pleural fluid. There is no definite guideline for therapeutic option. In general, these are susceptible to various antimicrobial agents but are often resistant to penicillin and cephalothin. We report a rare case of bacteremia by S. putrefaciens in a patient of head injury with polytrauma after a road traffic accident.
[Pt] Publication type:CASE REPORTS
[Em] Entry month:1801
[Cu] Class update date: 180111
[Lr] Last revision date:180111
[St] Status:In-Process
[do] DOI:10.4103/IJPM.IJPM_254_16

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[PMID]: 28851152
[Au] Autor:Xie J; Liang W; Lin J; Zhou X; Li M
[Ad] Address:Northwest Institute of Nuclear Technology, P.O. Box 69-14, Xi'an City, Shanxi Province 710024, PR China. Electronic address: xiejinchuan@nint.ac.cn.
[Ti] Title:Humic acids facilitated microbial reduction of polymeric Pu(IV) under anaerobic conditions.
[So] Source:Sci Total Environ;610-611:1321-1328, 2018 Jan 01.
[Is] ISSN:1879-1026
[Cp] Country of publication:Netherlands
[La] Language:eng
[Ab] Abstract:Flavins and humic substances have been extensively studied with emphasis on their ability to transfer extracellular electrons to insoluble metal oxides. Nevertheless, whether the low-solubility Pu(IV) polymers are microbially reduced to aqueous Pu(III) remains uncertain. Experiments were conducted under anaerobic and slightly alkaline conditions to study the difference between humic acids and flavins to transport extracellular electrons to Pu(IV) polymers. Our study demonstrates that Shewanella putrefaciens was unable to directly reduce polymeric Pu(IV) with a notably low reduction rate (3.4×10 mol/L Pu(III) within 144h). The relatively high redox potential of flavins reveals the thermodynamically unfavorable reduction: E (PuO (am)/Pu )
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1708
[Cu] Class update date: 180103
[Lr] Last revision date:180103
[St] Status:In-Process

  6 / 512 MEDLINE  
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[PMID]: 29197249
[Au] Autor:Huang JH
[Ad] Address:Environmental Geosciences, University of Basel, CH-4056, Basel, Switzerland. Electronic address: jen-how.huang@unibas.ch.
[Ti] Title:Characterising microbial reduction of arsenate sorbed to ferrihydrite and its concurrence with iron reduction.
[So] Source:Chemosphere;194:49-56, 2018 Mar.
[Is] ISSN:1879-1298
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:A series of model anoxic incubations were performed to understand the concurrence between arsenate and ferrihydrite reduction by Shewanella putrefaciens strain CN-32 at different concentrations of arsenate, ferrihydrite and lactate, and with given ΔG for arsenate and ferrihydrite reduction in non-growth conditions. The reduction kinetics of arsenate sorbed to ferrihydrite is predominately controlled by the availability of dissolved arsenate, which is measured by the integral of dissolved arsenate concentrations against incubation time and shown to correlate with the first order rate constants. High lactate concentrations slightly slowed down the rate of arsenate reduction due to the competition with arsenate for microbial contact. Under all experimental conditions, simultaneous arsenate and ferrihydrite reduction occurred following addition of S. putrefaciens inoculums and suggested no apparent competition between these two enzymatic reductions. Ferrous ions released from iron reduction might retard microbial arsenate reduction at high arsenate and ferrihydrite concentrations due to formation of ferrous arsenate. At high arsenate to ferrihydrite ratios, reductive dissolution of ferrihydrite shifted arsenate from sorption to dissolution and hence accelerated arsenate reduction. The interaction between microbial arsenate and ferrihydrite reduction did not correlate with ΔG , but instead was governed by other factors such as geochemical and microbial parameters.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1712
[Cu] Class update date: 171227
[Lr] Last revision date:171227
[St] Status:In-Process

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[PMID]: 29196015
[Au] Autor:Deng Q; Pu Y; Sun L; Wang Y; Liu Y; Wang R; Liao J; Xu D; Liu Y; Ye R; Fang Z; Gooneratne R
[Ad] Address:College of Food Science and Technology, Guangdong Ocean University, Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Key Laboratory of Advanced Processing of Aquatic Products of Guangdong Higher Education Institution, No. 1 Haida Road, Zhanjiang 524088, Guangdong Provinc
[Ti] Title:Antimicrobial peptide AMPNT-6 from Bacillus subtilis inhibits biofilm formation by Shewanella putrefaciens and disrupts its preformed biofilms on both abiotic and shrimp shell surfaces.
[So] Source:Food Res Int;102:8-13, 2017 Dec.
[Is] ISSN:1873-7145
[Cp] Country of publication:Canada
[La] Language:eng
[Ab] Abstract:Shewanella putrefaciens biofilm formation is of great concern for the shrimp industry because it adheres easily to food and food-contact surfaces and is a source of persistent and unseen contamination that causes shrimp spoilage and economic losses to the shrimp industry. Different concentrations of an antimicrobial lipopeptide, the fermentation product of Bacillus subtilis, AMPNT-6, were tested for the ability to reduce adhesion and disrupt S. putrefaciens preformed biofilms on two different contact surfaces (shrimp shell, stainless steel sheet). AMPNT-6 displayed a marked dose- and time-dependent anti-adhesive effect>biofilm removal. 3MIC AMPNT-6 was able both to remove biofilm and prevent bacteria from forming biofilm in a 96-well polystyrene microplate used as the model surface. 2MIC AMPNT-6 prevented bacteria from adhering to the microplate surface to form biofilm for 3h and removed already existing biofilm within 24h. Secretion of extracellular polymeric substances incubated in LB broth for 24h by S. putrefaciens was minimal at 3× MIC AMPNT-6. Scanning electron microscopy showed that damage to S. putrefaciens bacteria by AMPNT-6 possibly contributed to the non-adherence to the surfaces. Disruption of the mature biofilm structure by AMPNT-6 contributed to biofilm removal. It is concluded that AMPNT-6 can be used effectively to prevent attachment and also detach S. putrefaciens biofilms from shrimp shells, stainless steel sheets and polystyrene surfaces.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1712
[Cu] Class update date: 171202
[Lr] Last revision date:171202
[St] Status:In-Data-Review

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[PMID]: 29172040
[Au] Autor:Guo P; Zhang C; Wang Y; Yu X; Zhang Z; Zhang D
[Ad] Address:Institute of Marine Biology, Ocean College, Zhejiang University, Zhoushan 316021, Zhejiang, China; Institute of Agricultural Products Processing and Nuclear Agriculture Technology Research, Hubei Academy of Agricultural Sciences, Wuhan 430064, China.
[Ti] Title:Effect of long-term fertilization on humic redox mediators in multiple microbial redox reactions.
[So] Source:Environ Pollut;234:107-114, 2017 Nov 21.
[Is] ISSN:1873-6424
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:This study investigated the effects of different long-term fertilizations on humic substances (HSs), humic acids (HAs) and humins, functioning as redox mediators for various microbial redox biotransformations, including 2,2',4,4',5,5'- hexachlorobiphenyl (PCB ) dechlorination, dissimilatory iron reduction, and nitrate reduction, and their electron-mediating natures. The redox activity of HSs for various microbial redox metabolisms was substantially enhanced by long-term application of organic fertilizer (pig manure). As a redox mediator, only humin extracted from soils with organic fertilizer amendment (OF-HM) maintained microbial PCB dechlorination activity (1.03 µM PCB removal), and corresponding HA (OF-HA) most effectively enhanced iron reduction and nitrate reduction by Shewanella putrefaciens. Electrochemical analysis confirmed the enhancement of their electron transfer capacity and redox properties. Fourier transform infrared analysis showed that C=C and C=O bonds, and carboxylic or phenolic groups in HSs might be the redox functional groups affected by fertilization. This research enhances our understanding of the influence of anthropogenic fertility on the biogeochemical cycling of elements and in situ remediation ability in agroecosystems through microorganisms' metabolisms.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1711
[Cu] Class update date: 171124
[Lr] Last revision date:171124
[St] Status:Publisher

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[PMID]: 29022087
[Au] Autor:Valdivia-González MA; Díaz-Vásquez WA; Ruiz-León D; Becerra AA; Aguayo DR; Pérez-Donoso JM; Vásquez CC
[Ad] Address:Laboratorio de Microbiología Molecular, Departamento de Biología, Facultad de Química y Biología, Universidad de Santiago de Chile, Avenida Libertador Bernardo O'Higgins #3363. Estación Central, Santiago, Chile.
[Ti] Title:A comparative analysis of tellurite detoxification by members of the genus Shewanella.
[So] Source:Arch Microbiol;, 2017 Oct 11.
[Is] ISSN:1432-072X
[Cp] Country of publication:Germany
[La] Language:eng
[Ab] Abstract:The increasing industrial utilization of tellurium has resulted in an important environmental pollution with the soluble, extremely toxic oxyanion tellurite. In this context, the use of microorganisms for detoxifying tellurite or tellurium biorecovery has gained great interest. The ability of different Shewanella strains to reduce tellurite to elemental tellurium was assessed; the results showed that the reduction process is dependent on electron transport and the ∆pH gradient. While S. baltica OS155 showed the highest tellurite resistance, S. putrefaciens was the most efficient in reducing tellurite. Moreover, pH-dependent tellurite transformation was associated with tellurium precipitation as tellurium dioxide. In summary, this work highlights the high tellurite reduction/detoxification ability exhibited by a number of Shewanella species, which could represent the starting point to develop friendly methods for the recovery of elemental tellurium (or tellurium dioxide).
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1710
[Cu] Class update date: 171012
[Lr] Last revision date:171012
[St] Status:Publisher
[do] DOI:10.1007/s00203-017-1438-2

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[PMID]: 28861914
[Au] Autor:Chen J; Nadar VS; Rosen BP
[Ad] Address:Department of Cellular Biology and Pharmacology, Herbert Wertheim College of Medicine, Florida International University, Miami, FL 33199, USA.
[Ti] Title:A novel MAs(III)-selective ArsR transcriptional repressor.
[So] Source:Mol Microbiol;106(3):469-478, 2017 Nov.
[Is] ISSN:1365-2958
[Cp] Country of publication:England
[La] Language:eng
[Ab] Abstract:Microbial expression of genes for resistance to heavy metals and metalloids is usually transcriptionally regulated by the toxic ions themselves. Arsenic is a ubiquitous, naturally occurring toxic metalloid widely distributed in soil and groundwater. Microbes biotransform both arsenate (As(V)) and arsenite (As(III)) into more toxic methylated metabolites methylarsenite (MAs(III)) and dimethylarsenite (DMAs(III)). Environmental arsenic is sensed by members of the ArsR/SmtB family. The arsR gene is autoregulated and is typically part of an operon that contains other ars genes involved in arsenic detoxification. To date every identified ArsR is regulated by inorganic As(III). Here we described a novel ArsR from Shewanella putrefaciens selective for MAs(III). SpArsR orthologs control expression of two MAs(III) resistance genes, arsP that encodes the ArsP MAs(III) efflux permease, and arsH encoding the ArsH MAs(III) oxidase. SpArsR has two conserved cysteine residues, Cys101 and Cys102. Mutation of either resulted in loss of MAs(III) binding, indicating that they form an MAs(III) binding site. SpArsR can be converted into an As(III)-responsive repressor by introduction of an additional cysteine that allows for three-coordinate As(III) binding. Our results indicate that SpArsR evolved selectivity for MAs(III) over As(III) in order to control expression of genes for MAs(III) detoxification.
[Pt] Publication type:JOURNAL ARTICLE
[Em] Entry month:1709
[Cu] Class update date: 171025
[Lr] Last revision date:171025
[St] Status:In-Process
[do] DOI:10.1111/mmi.13826


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