Differential behaviors of silver nanoparticles and silver ions towards cysteine: Bioremediation and toxicity to Phanerochaete chrysosporium.
Identifieur interne : 000116 ( Main/Corpus ); précédent : 000115; suivant : 000117Differential behaviors of silver nanoparticles and silver ions towards cysteine: Bioremediation and toxicity to Phanerochaete chrysosporium.
Auteurs : Zhenzhen Huang ; Zhuotong Zeng ; Anwei Chen ; Guangming Zeng ; Rong Xiao ; Piao Xu ; Kai He ; Zhongxian Song ; Liang Hu ; Min Peng ; Tiantian Huang ; Guiqiu ChenSource :
- Chemosphere [ 1879-1298 ] ; 2018.
English descriptors
- KwdEn :
- Biodegradation, Environmental (MeSH), Cysteine (chemistry), Cysteine (metabolism), Metal Nanoparticles (chemistry), Metal Nanoparticles (toxicity), Phanerochaete (drug effects), Phanerochaete (metabolism), Reactive Oxygen Species (metabolism), Silver (chemistry), Silver (toxicity), Water Purification (methods).
- MESH :
- chemical , chemistry : Cysteine, Silver.
- chemical , metabolism : Cysteine, Reactive Oxygen Species.
- chemistry : Metal Nanoparticles.
- drug effects : Phanerochaete.
- metabolism : Phanerochaete.
- methods : Water Purification.
- toxicity : Metal Nanoparticles, Silver.
- Biodegradation, Environmental.
Abstract
Potential transformations of silver nanoparticles (AgNPs) upon interaction with naturally ubiquitous organic ligands in aquatic environments influence their transport, persistence, bioavailability, and subsequent toxicity to organisms. In this study, differential behaviors of AgNPs and silver ions (Ag+) towards cysteine (Cys), an amino acid representative of thiol ligands that easily coordinate to Ag+ and graft to nanoparticle surfaces, were investigated in the aspects of bioremediation and their toxicity to Phanerochaete chrysosporium. Total Ag removal, 2,4-dichlorophenol (2,4-DCP) degradation, extracellular protein secretion, and cellular viability were enhanced to some extent after supplement of various concentrations of cysteine under stress of AgNPs and Ag+. However, an obvious decrease in total Ag uptake was observed after 5-50 μM cysteine addition in the groups treated with 10 μM AgNPs and 1 μM Ag+, especially at a Cys:Ag molar ratio of 5. More stabilization in uptake pattern at this ratio was detected under Ag+ exposure than that under AgNP exposure. Furthermore, in the absence of cysteine, all Ag+ treatments stimulated the generation of reactive oxygen species (ROS) more significantly than high-dose AgNPs did. However, cysteine supply under AgNP/Ag+ stress aggravated ROS levels, albeit alleviated at 100 μM Ag+, indicating that the toxicity profiles of AgNPs and Ag+ to P. chrysosporium could be exacerbated or marginally mitigated by cysteine. The results obtained were possibly associated with the lability and bioavailability of AgNP/Ag+-cysteine complexes.
DOI: 10.1016/j.chemosphere.2018.03.144
PubMed: 29614413
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Electronic address: xiaorong65@csu.edu.cn.</nlm:affiliation></affiliation></author><author><name sortKey="Xu, Piao" sort="Xu, Piao" uniqKey="Xu P" first="Piao" last="Xu">Piao Xu</name><affiliation><nlm:affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.</nlm:affiliation></affiliation></author><author><name sortKey="He, Kai" sort="He, Kai" uniqKey="He K" first="Kai" last="He">Kai He</name><affiliation><nlm:affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.</nlm:affiliation></affiliation></author><author><name sortKey="Song, Zhongxian" sort="Song, Zhongxian" uniqKey="Song Z" first="Zhongxian" last="Song">Zhongxian Song</name><affiliation><nlm:affiliation>School of Municipal and Environmental Engineering, Henan University of Urban Construction, Pingdingshan, 467036, PR China.</nlm:affiliation></affiliation></author><author><name sortKey="Hu, Liang" sort="Hu, Liang" uniqKey="Hu L" first="Liang" last="Hu">Liang Hu</name><affiliation><nlm:affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.</nlm:affiliation></affiliation></author><author><name sortKey="Peng, Min" sort="Peng, Min" uniqKey="Peng M" first="Min" last="Peng">Min Peng</name><affiliation><nlm:affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.</nlm:affiliation></affiliation></author><author><name sortKey="Huang, Tiantian" sort="Huang, Tiantian" uniqKey="Huang T" first="Tiantian" last="Huang">Tiantian Huang</name><affiliation><nlm:affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.</nlm:affiliation></affiliation></author><author><name sortKey="Chen, Guiqiu" sort="Chen, Guiqiu" uniqKey="Chen G" first="Guiqiu" last="Chen">Guiqiu Chen</name><affiliation><nlm:affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.</nlm:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">PubMed</idno><date when="2018">2018</date><idno type="RBID">pubmed:29614413</idno><idno type="pmid">29614413</idno><idno type="doi">10.1016/j.chemosphere.2018.03.144</idno><idno type="wicri:Area/Main/Corpus">000116</idno><idno type="wicri:explorRef" wicri:stream="Main" wicri:step="Corpus" wicri:corpus="PubMed">000116</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Differential behaviors of silver nanoparticles and silver ions towards cysteine: Bioremediation and toxicity to Phanerochaete chrysosporium.</title><author><name sortKey="Huang, Zhenzhen" sort="Huang, Zhenzhen" uniqKey="Huang Z" first="Zhenzhen" last="Huang">Zhenzhen Huang</name><affiliation><nlm:affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.</nlm:affiliation></affiliation></author><author><name sortKey="Zeng, Zhuotong" sort="Zeng, Zhuotong" uniqKey="Zeng Z" first="Zhuotong" last="Zeng">Zhuotong Zeng</name><affiliation><nlm:affiliation>Department of Dermatology, Second Xiangya Hospital, Central South University, Changsha, 410011, PR China.</nlm:affiliation></affiliation></author><author><name sortKey="Chen, Anwei" sort="Chen, Anwei" uniqKey="Chen A" first="Anwei" last="Chen">Anwei Chen</name><affiliation><nlm:affiliation>College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, PR China.</nlm:affiliation></affiliation></author><author><name sortKey="Zeng, Guangming" sort="Zeng, Guangming" uniqKey="Zeng G" first="Guangming" last="Zeng">Guangming Zeng</name><affiliation><nlm:affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China. Electronic address: zgming@hnu.edu.cn.</nlm:affiliation></affiliation></author><author><name sortKey="Xiao, Rong" sort="Xiao, Rong" uniqKey="Xiao R" first="Rong" last="Xiao">Rong Xiao</name><affiliation><nlm:affiliation>Department of Dermatology, Second Xiangya Hospital, Central South University, Changsha, 410011, PR China. Electronic address: xiaorong65@csu.edu.cn.</nlm:affiliation></affiliation></author><author><name sortKey="Xu, Piao" sort="Xu, Piao" uniqKey="Xu P" first="Piao" last="Xu">Piao Xu</name><affiliation><nlm:affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.</nlm:affiliation></affiliation></author><author><name sortKey="He, Kai" sort="He, Kai" uniqKey="He K" first="Kai" last="He">Kai He</name><affiliation><nlm:affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.</nlm:affiliation></affiliation></author><author><name sortKey="Song, Zhongxian" sort="Song, Zhongxian" uniqKey="Song Z" first="Zhongxian" last="Song">Zhongxian Song</name><affiliation><nlm:affiliation>School of Municipal and Environmental Engineering, Henan University of Urban Construction, Pingdingshan, 467036, PR China.</nlm:affiliation></affiliation></author><author><name sortKey="Hu, Liang" sort="Hu, Liang" uniqKey="Hu L" first="Liang" last="Hu">Liang Hu</name><affiliation><nlm:affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.</nlm:affiliation></affiliation></author><author><name sortKey="Peng, Min" sort="Peng, Min" uniqKey="Peng M" first="Min" last="Peng">Min Peng</name><affiliation><nlm:affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.</nlm:affiliation></affiliation></author><author><name sortKey="Huang, Tiantian" sort="Huang, Tiantian" uniqKey="Huang T" first="Tiantian" last="Huang">Tiantian Huang</name><affiliation><nlm:affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.</nlm:affiliation></affiliation></author><author><name sortKey="Chen, Guiqiu" sort="Chen, Guiqiu" uniqKey="Chen G" first="Guiqiu" last="Chen">Guiqiu Chen</name><affiliation><nlm:affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.</nlm:affiliation></affiliation></author></analytic><series><title level="j">Chemosphere</title><idno type="eISSN">1879-1298</idno><imprint><date when="2018" type="published">2018</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Biodegradation, Environmental (MeSH)</term><term>Cysteine (chemistry)</term><term>Cysteine (metabolism)</term><term>Metal Nanoparticles (chemistry)</term><term>Metal Nanoparticles (toxicity)</term><term>Phanerochaete (drug effects)</term><term>Phanerochaete (metabolism)</term><term>Reactive Oxygen Species (metabolism)</term><term>Silver (chemistry)</term><term>Silver (toxicity)</term><term>Water Purification (methods)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Cysteine</term><term>Silver</term></keywords><keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en"><term>Cysteine</term><term>Reactive Oxygen Species</term></keywords><keywords scheme="MESH" qualifier="chemistry" xml:lang="en"><term>Metal Nanoparticles</term></keywords><keywords scheme="MESH" qualifier="drug effects" xml:lang="en"><term>Phanerochaete</term></keywords><keywords scheme="MESH" qualifier="metabolism" xml:lang="en"><term>Phanerochaete</term></keywords><keywords scheme="MESH" qualifier="methods" xml:lang="en"><term>Water Purification</term></keywords><keywords scheme="MESH" qualifier="toxicity" xml:lang="en"><term>Metal Nanoparticles</term><term>Silver</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Biodegradation, Environmental</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Potential transformations of silver nanoparticles (AgNPs) upon interaction with naturally ubiquitous organic ligands in aquatic environments influence their transport, persistence, bioavailability, and subsequent toxicity to organisms. In this study, differential behaviors of AgNPs and silver ions (Ag<sup>+</sup>) towards cysteine (Cys), an amino acid representative of thiol ligands that easily coordinate to Ag<sup>+</sup> and graft to nanoparticle surfaces, were investigated in the aspects of bioremediation and their toxicity to Phanerochaete chrysosporium. Total Ag removal, 2,4-dichlorophenol (2,4-DCP) degradation, extracellular protein secretion, and cellular viability were enhanced to some extent after supplement of various concentrations of cysteine under stress of AgNPs and Ag<sup>+</sup>. However, an obvious decrease in total Ag uptake was observed after 5-50 μM cysteine addition in the groups treated with 10 μM AgNPs and 1 μM Ag<sup>+</sup>, especially at a Cys:Ag molar ratio of 5. More stabilization in uptake pattern at this ratio was detected under Ag<sup>+</sup> exposure than that under AgNP exposure. Furthermore, in the absence of cysteine, all Ag<sup>+</sup> treatments stimulated the generation of reactive oxygen species (ROS) more significantly than high-dose AgNPs did. However, cysteine supply under AgNP/Ag<sup>+</sup> stress aggravated ROS levels, albeit alleviated at 100 μM Ag<sup>+</sup>, indicating that the toxicity profiles of AgNPs and Ag<sup>+</sup> to P. chrysosporium could be exacerbated or marginally mitigated by cysteine. The results obtained were possibly associated with the lability and bioavailability of AgNP/Ag<sup>+</sup>-cysteine complexes.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" IndexingMethod="Curated" Owner="NLM"><PMID Version="1">29614413</PMID><DateCompleted><Year>2018</Year><Month>08</Month><Day>14</Day></DateCompleted><DateRevised><Year>2018</Year><Month>12</Month><Day>02</Day></DateRevised><Article PubModel="Print-Electronic"><Journal><ISSN IssnType="Electronic">1879-1298</ISSN><JournalIssue CitedMedium="Internet"><Volume>203</Volume><PubDate><Year>2018</Year><Month>Jul</Month></PubDate></JournalIssue><Title>Chemosphere</Title><ISOAbbreviation>Chemosphere</ISOAbbreviation></Journal><ArticleTitle>Differential behaviors of silver nanoparticles and silver ions towards cysteine: Bioremediation and toxicity to Phanerochaete chrysosporium.</ArticleTitle><Pagination><MedlinePgn>199-208</MedlinePgn></Pagination><ELocationID EIdType="pii" ValidYN="Y">S0045-6535(18)30561-7</ELocationID><ELocationID EIdType="doi" ValidYN="Y">10.1016/j.chemosphere.2018.03.144</ELocationID><Abstract><AbstractText>Potential transformations of silver nanoparticles (AgNPs) upon interaction with naturally ubiquitous organic ligands in aquatic environments influence their transport, persistence, bioavailability, and subsequent toxicity to organisms. In this study, differential behaviors of AgNPs and silver ions (Ag<sup>+</sup>) towards cysteine (Cys), an amino acid representative of thiol ligands that easily coordinate to Ag<sup>+</sup> and graft to nanoparticle surfaces, were investigated in the aspects of bioremediation and their toxicity to Phanerochaete chrysosporium. Total Ag removal, 2,4-dichlorophenol (2,4-DCP) degradation, extracellular protein secretion, and cellular viability were enhanced to some extent after supplement of various concentrations of cysteine under stress of AgNPs and Ag<sup>+</sup>. However, an obvious decrease in total Ag uptake was observed after 5-50 μM cysteine addition in the groups treated with 10 μM AgNPs and 1 μM Ag<sup>+</sup>, especially at a Cys:Ag molar ratio of 5. More stabilization in uptake pattern at this ratio was detected under Ag<sup>+</sup> exposure than that under AgNP exposure. Furthermore, in the absence of cysteine, all Ag<sup>+</sup> treatments stimulated the generation of reactive oxygen species (ROS) more significantly than high-dose AgNPs did. However, cysteine supply under AgNP/Ag<sup>+</sup> stress aggravated ROS levels, albeit alleviated at 100 μM Ag<sup>+</sup>, indicating that the toxicity profiles of AgNPs and Ag<sup>+</sup> to P. chrysosporium could be exacerbated or marginally mitigated by cysteine. The results obtained were possibly associated with the lability and bioavailability of AgNP/Ag<sup>+</sup>-cysteine complexes.</AbstractText><CopyrightInformation>Copyright © 2018 Elsevier Ltd. All rights reserved.</CopyrightInformation></Abstract><AuthorList CompleteYN="Y"><Author ValidYN="Y"><LastName>Huang</LastName><ForeName>Zhenzhen</ForeName><Initials>Z</Initials><AffiliationInfo><Affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Zeng</LastName><ForeName>Zhuotong</ForeName><Initials>Z</Initials><AffiliationInfo><Affiliation>Department of Dermatology, Second Xiangya Hospital, Central South University, Changsha, 410011, PR China.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Chen</LastName><ForeName>Anwei</ForeName><Initials>A</Initials><AffiliationInfo><Affiliation>College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, PR China.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Zeng</LastName><ForeName>Guangming</ForeName><Initials>G</Initials><AffiliationInfo><Affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China. Electronic address: zgming@hnu.edu.cn.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Xiao</LastName><ForeName>Rong</ForeName><Initials>R</Initials><AffiliationInfo><Affiliation>Department of Dermatology, Second Xiangya Hospital, Central South University, Changsha, 410011, PR China. Electronic address: xiaorong65@csu.edu.cn.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Xu</LastName><ForeName>Piao</ForeName><Initials>P</Initials><AffiliationInfo><Affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>He</LastName><ForeName>Kai</ForeName><Initials>K</Initials><AffiliationInfo><Affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Song</LastName><ForeName>Zhongxian</ForeName><Initials>Z</Initials><AffiliationInfo><Affiliation>School of Municipal and Environmental Engineering, Henan University of Urban Construction, Pingdingshan, 467036, PR China.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Hu</LastName><ForeName>Liang</ForeName><Initials>L</Initials><AffiliationInfo><Affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Peng</LastName><ForeName>Min</ForeName><Initials>M</Initials><AffiliationInfo><Affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Huang</LastName><ForeName>Tiantian</ForeName><Initials>T</Initials><AffiliationInfo><Affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.</Affiliation></AffiliationInfo></Author><Author ValidYN="Y"><LastName>Chen</LastName><ForeName>Guiqiu</ForeName><Initials>G</Initials><AffiliationInfo><Affiliation>College of Environmental Science and Engineering, Hunan University and Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, PR China.</Affiliation></AffiliationInfo></Author></AuthorList><Language>eng</Language><PublicationTypeList><PublicationType UI="D016428">Journal Article</PublicationType></PublicationTypeList><ArticleDate DateType="Electronic"><Year>2018</Year><Month>03</Month><Day>21</Day></ArticleDate></Article><MedlineJournalInfo><Country>England</Country><MedlineTA>Chemosphere</MedlineTA><NlmUniqueID>0320657</NlmUniqueID><ISSNLinking>0045-6535</ISSNLinking></MedlineJournalInfo><ChemicalList><Chemical><RegistryNumber>0</RegistryNumber><NameOfSubstance UI="D017382">Reactive Oxygen Species</NameOfSubstance></Chemical><Chemical><RegistryNumber>3M4G523W1G</RegistryNumber><NameOfSubstance UI="D012834">Silver</NameOfSubstance></Chemical><Chemical><RegistryNumber>K848JZ4886</RegistryNumber><NameOfSubstance UI="D003545">Cysteine</NameOfSubstance></Chemical></ChemicalList><CitationSubset>IM</CitationSubset><MeshHeadingList><MeshHeading><DescriptorName UI="D001673" MajorTopicYN="N">Biodegradation, Environmental</DescriptorName></MeshHeading><MeshHeading><DescriptorName UI="D003545" MajorTopicYN="N">Cysteine</DescriptorName><QualifierName UI="Q000737" MajorTopicYN="Y">chemistry</QualifierName><QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D053768" MajorTopicYN="N">Metal Nanoparticles</DescriptorName><QualifierName UI="Q000737" MajorTopicYN="N">chemistry</QualifierName><QualifierName UI="Q000633" MajorTopicYN="N">toxicity</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D020075" MajorTopicYN="N">Phanerochaete</DescriptorName><QualifierName UI="Q000187" MajorTopicYN="Y">drug effects</QualifierName><QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D017382" MajorTopicYN="N">Reactive Oxygen Species</DescriptorName><QualifierName UI="Q000378" MajorTopicYN="N">metabolism</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D012834" MajorTopicYN="N">Silver</DescriptorName><QualifierName UI="Q000737" MajorTopicYN="Y">chemistry</QualifierName><QualifierName UI="Q000633" MajorTopicYN="N">toxicity</QualifierName></MeshHeading><MeshHeading><DescriptorName UI="D018508" MajorTopicYN="N">Water Purification</DescriptorName><QualifierName UI="Q000379" MajorTopicYN="Y">methods</QualifierName></MeshHeading></MeshHeadingList><KeywordList Owner="NOTNLM"><Keyword MajorTopicYN="N">Bioremediation</Keyword><Keyword MajorTopicYN="N">Cysteine</Keyword><Keyword MajorTopicYN="N">Phanerochaete chrysosporium</Keyword><Keyword MajorTopicYN="N">Silver ion</Keyword><Keyword MajorTopicYN="N">Silver nanoparticles</Keyword><Keyword MajorTopicYN="N">Toxicity</Keyword></KeywordList></MedlineCitation><PubmedData><History><PubMedPubDate PubStatus="received"><Year>2018</Year><Month>01</Month><Day>31</Day></PubMedPubDate><PubMedPubDate PubStatus="revised"><Year>2018</Year><Month>03</Month><Day>18</Day></PubMedPubDate><PubMedPubDate PubStatus="accepted"><Year>2018</Year><Month>03</Month><Day>21</Day></PubMedPubDate><PubMedPubDate 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