Microbial Destruction of Guanidine-Containing Polymers
The fracture of guanidine-containing polymers and the chemical and physicomechanical properties of the synthesized materials under the influence of hydrocarbon-oxidizing bacteria (HOB) were studied. Scanning electron microscopy revealed the formation of a HOB biofilm on the surface of the studied ma...
Saved in:
Published in | Materials science (New York, N.Y.) Vol. 59; no. 4; pp. 494 - 503 |
---|---|
Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
New York
Springer US
01.12.2023
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Abstract | The fracture of guanidine-containing polymers and the chemical and physicomechanical properties of the synthesized materials under the influence of hydrocarbon-oxidizing bacteria (HOB) were studied. Scanning electron microscopy revealed the formation of a HOB biofilm on the surface of the studied materials. Such polymers inhibited catalase and lipolytic activity 1.3–3 times compared to the environment under control. According to the obtained data, the fracture of guanidine polymers was insignificant (4.4–6.53%). The physicomechanical properties of the materials – tensile strength and relative elongation practically did not change during 180 days of the experiment. These results are consistent with the results of IR microscopy. The method of thermogravimetric analysis showed that for the two studied materials, the initial temperature of decomposition did not decrease and their properties after exposure to the HOB did not change. It can be assumed that under the influence of bacteria on the surfaces of these polymers, minor surface biodegradation may have occurred. Therefore, the tested polyurethane-based material is promising for protecting various structures against biodamage. |
---|---|
AbstractList | The fracture of guanidine-containing polymers and the chemical and physicomechanical properties of the synthesized materials under the influence of hydrocarbon-oxidizing bacteria (HOB) were studied. Scanning electron microscopy revealed the formation of a HOB biofilm on the surface of the studied materials. Such polymers inhibited catalase and lipolytic activity 1.3–3 times compared to the environment under control. According to the obtained data, the fracture of guanidine polymers was insignificant (4.4–6.53%). The physicomechanical properties of the materials – tensile strength and relative elongation practically did not change during 180 days of the experiment. These results are consistent with the results of IR microscopy. The method of thermogravimetric analysis showed that for the two studied materials, the initial temperature of decomposition did not decrease and their properties after exposure to the HOB did not change. It can be assumed that under the influence of bacteria on the surfaces of these polymers, minor surface biodegradation may have occurred. Therefore, the tested polyurethane-based material is promising for protecting various structures against biodamage. |
Author | Terebilenko, A. V. Kopteva, G. E. Vortman, M. Ya Iutynska, G. O. Pylypenko, A. M. Shevchenko, V. V. Lemeshko, V. M. Abdulina, D. R. Kopteva, Zh. O. |
Author_xml | – sequence: 1 givenname: Zh. O. surname: Kopteva fullname: Kopteva, Zh. O. organization: Zabolotny Institute of Microbiology and Virology, National Academy of Sciences of Ukraine – sequence: 2 givenname: M. Ya surname: Vortman fullname: Vortman, M. Ya email: vmar1962@i.ua organization: Institute of Macromolecular Chemistry, National Academy of Sciences of Ukraine – sequence: 3 givenname: G. O. surname: Iutynska fullname: Iutynska, G. O. organization: Zabolotny Institute of Microbiology and Virology, National Academy of Sciences of Ukraine – sequence: 4 givenname: G. E. surname: Kopteva fullname: Kopteva, G. E. organization: Zabolotny Institute of Microbiology and Virology, National Academy of Sciences of Ukraine – sequence: 5 givenname: D. R. surname: Abdulina fullname: Abdulina, D. R. organization: Zabolotny Institute of Microbiology and Virology, National Academy of Sciences of Ukraine – sequence: 6 givenname: V. M. surname: Lemeshko fullname: Lemeshko, V. M. organization: Institute of Macromolecular Chemistry, National Academy of Sciences of Ukraine – sequence: 7 givenname: A. V. surname: Terebilenko fullname: Terebilenko, A. V. organization: Kholodny Institute of Botany, National Academy of Sciences of Ukraine – sequence: 8 givenname: A. M. surname: Pylypenko fullname: Pylypenko, A. M. organization: Institute of Macromolecular Chemistry, National Academy of Sciences of Ukraine – sequence: 9 givenname: V. V. surname: Shevchenko fullname: Shevchenko, V. V. organization: Institute of Macromolecular Chemistry, National Academy of Sciences of Ukraine |
BookMark | eNp9UD1PwzAUtBBItIU_wBSJ2fD8EdsZUYGCVAQDSN0sx3UqV61d7GTov8cQJDamu-Hu3r2botMQg0PoisANAZC3mRRgGCjHAKqw5gRNSC0ZVqpenRYOQmFFYXWOpjlvoZhqWU-QePE2xdabXXXvcp8G2_sYqthVi8EEv_bB4XkMvfHBh031FnfHvUv5Ap11Zpfd5S_O0Mfjw_v8CS9fF8_zuyW2VEKPOfC1gdoKzowSRIpGto0zzoLpmABFwBle6vLWtZQbS52VsuGia6llrTNshq7H3EOKn0MpqLdxSKGc1Ax4I6WomSgqOqrKKzkn1-lD8nuTjpqA_t5Hj_voso_-2Uc3xcRGUy7isHHpL_of1xcM12mt |
Cites_doi | 10.1007/s10924-004-1230-7 10.15407/microbiol82.06.054 10.1128/AEM.02420-06 10.1007/s10924-007-0053-8 10.1016/S0964-8305(03)00110-0 10.1016/j.copbio.2005.04.007 10.1016/j.ram.2017.07.005 10.1007/s11003-022-00579-w 10.15407/biotech13.04.060 |
ContentType | Journal Article |
Copyright | Springer Science+Business Media, LLC, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. |
Copyright_xml | – notice: Springer Science+Business Media, LLC, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law. |
DBID | AAYXX CITATION |
DOI | 10.1007/s11003-024-00803-9 |
DatabaseName | CrossRef |
DatabaseTitle | CrossRef |
DatabaseTitleList | |
DeliveryMethod | fulltext_linktorsrc |
Discipline | Engineering |
EISSN | 1573-885X |
EndPage | 503 |
ExternalDocumentID | 10_1007_s11003_024_00803_9 |
GroupedDBID | -4Y -58 -5G -BR -EM -Y2 -~C -~X .86 .VR 06C 06D 0R~ 0VY 1N0 1SB 2.D 28- 29M 2J2 2JN 2JY 2KG 2KM 2LR 2P1 2VQ 2~H 30V 4.4 406 408 409 40D 40E 5GY 5QI 5VS 642 67Z 6NX 8FE 8FG 8TC 8UJ 95- 95. 95~ 96X AAAVM AABHQ AABYN AACDK AAEOY AAFGU AAGCJ AAHNG AAIAL AAIKT AAJBT AAJKR AANZL AARHV AARTL AASML AATNV AATVU AAUCO AAUYE AAWCG AAYIU AAYQN AAYTO ABAKF ABBBX ABBXA ABDBF ABDZT ABECU ABEFU ABFGW ABFTV ABHLI ABHQN ABJCF ABJNI ABJOX ABKAS ABKCH ABKTR ABMNI ABMQK ABNWP ABQBU ABSXP ABTEG ABTHY ABTKH ABTMW ABULA ABWNU ABXPI ACAOD ACBMV ACBRV ACBXY ACBYP ACDTI ACGFS ACHSB ACHXU ACIGE ACIPQ ACIWK ACKNC ACMDZ ACMLO ACOKC ACOMO ACSNA ACTTH ACVWB ACWMK ACZOJ ADHHG ADHIR ADIMF ADINQ ADKNI ADKPE ADMDM ADOXG ADRFC ADTPH ADURQ ADYFF ADZKW AEBTG AEEQQ AEFIE AEFQL AEFTE AEGAL AEGNC AEJHL AEJRE AEKMD AEMSY AENEX AEOHA AEPYU AESKC AESTI AETLH AEVLU AEVTX AEXYK AFBBN AFEXP AFGCZ AFKRA AFLOW AFNRJ AFQWF AFWTZ AFZKB AGAYW AGDGC AGGBP AGGDS AGJBK AGMZJ AGQEE AGQMX AGRTI AGWIL AGWZB AGYKE AHAVH AHBYD AHKAY AHSBF AHYZX AIAKS AIGIU AIIXL AILAN AIMYW AITGF AJBLW AJDOV AJGSW AJRNO AKQUC ALMA_UNASSIGNED_HOLDINGS ALWAN AMKLP AMXSW AMYLF AMYQR AOCGG ARMRJ ASPBG AVWKF AXYYD AZFZN B-. B0M BA0 BBWZM BDATZ BENPR BGLVJ BGNMA CAG CCPQU COF CS3 CSCUP CZ9 D1I DDRTE DL5 DNIVK DPUIP EAD EAP EBLON EBS EIOEI EJD EMK EPL ESBYG ESX FEDTE FERAY FFXSO FIGPU FINBP FNLPD FRRFC FSGXE FWDCC G-Y G-Z GGCAI GGRSB GJIRD GNWQR GQ6 GQ7 GQ8 GXS HCIFZ HF~ HG6 HMJXF HQYDN HRMNR HVGLF HZ~ I-F IAO IHE IJ- IKXTQ ISR ITC IWAJR IXC IXD IXE IZIGR IZQ I~X I~Z J-C JBSCW JCJTX JZLTJ KB. KC. KDC KOV KOW LAK LLZTM M4Y MA- MK~ N2Q NB0 NDZJH NPVJJ NQJWS NU0 O9- O93 O9G O9I O9J OAM OVD P19 P9N PDBOC PF0 PT4 PT5 QOK QOR QOS R89 R9I RHV RIG RNI RNS ROL RPX RSV RZC RZE RZK S16 S1Z S26 S27 S28 S3B SAP SCG SCLPG SCM SDH SDM SHX SISQX SJYHP SNE SNPRN SNX SOHCF SOJ SPISZ SQXTU SRMVM SSLCW STPWE SZN T13 T16 TEORI TSG TSK TSV TUC TUS U2A UG4 UNUBA UOJIU UTJUX UZXMN VC2 VFIZW W23 W48 W4F WJK WK8 XU3 YLTOR Z5O Z7R Z7S Z7V Z7X Z7Y Z7Z Z83 Z85 Z86 Z88 Z8M Z8N Z8P Z8R Z8S Z8T Z8W Z8Z Z92 ZMTXR ~8M ~EX AAYXX AGJZZ CITATION AAYZH |
ID | FETCH-LOGICAL-c270t-404da05c643a8617697b9eaec0af360810ea48034beb24ac2ec77946fb2c3bea3 |
IEDL.DBID | AGYKE |
ISSN | 1068-820X |
IngestDate | Wed Nov 06 08:33:05 EST 2024 Thu Sep 12 16:31:13 EDT 2024 Thu May 02 08:43:58 EDT 2024 |
IsPeerReviewed | true |
IsScholarly | true |
Issue | 4 |
Keywords | tensile strength relative elongation IR microscopy thermogravimetry biodegradation hydrocarbon-oxidizing bacteria enzymes guanidine-containing polymers |
Language | English |
LinkModel | DirectLink |
MergedId | FETCHMERGED-LOGICAL-c270t-404da05c643a8617697b9eaec0af360810ea48034beb24ac2ec77946fb2c3bea3 |
PQID | 3049776536 |
PQPubID | 2044364 |
PageCount | 10 |
ParticipantIDs | proquest_journals_3049776536 crossref_primary_10_1007_s11003_024_00803_9 springer_journals_10_1007_s11003_024_00803_9 |
PublicationCentury | 2000 |
PublicationDate | 2023-12-01 |
PublicationDateYYYYMMDD | 2023-12-01 |
PublicationDate_xml | – month: 12 year: 2023 text: 2023-12-01 day: 01 |
PublicationDecade | 2020 |
PublicationPlace | New York |
PublicationPlace_xml | – name: New York – name: Heidelberg |
PublicationTitle | Materials science (New York, N.Y.) |
PublicationTitleAbbrev | Mater Sci |
PublicationYear | 2023 |
Publisher | Springer US Springer Nature B.V |
Publisher_xml | – name: Springer US – name: Springer Nature B.V |
References | M. Ya. Vortman, Yu. B. Pysmenna, A. I. Chuenko, D. R. Abdulina, Zh. P. Kopteva, A. E. Kopteva, A. V. Rudenko, V. V. Tretyak, V. N. Lemeshko, and V. V. Shevchenko, “Fungicidal and bactericidal activity of the alkyl-substituted guanidine-containing oligomers,” Mikrobiol. Zhurnal., 82, Is. 6, 54–63 (2020). https://doi.org/10.15407/microbiol82.06.054 A. Lugauskas, L. Levinskaite, and D. Peciulyte, “Micromycetes as deterioration agents of polymeric materials,” Int. Biodeterior and Biodegrad., 52, Is. 4, 233–242 (2003). https://doi.org/10.1016/S0964-8305(03)00110-0 J.-G. Gu, and J.-D. Gu, “Methods currently used in testing microbiological degradation and deterioration of a wide range of polymeric materials with various degree of degradability: A review,” J. of Polymers and the Environment, 13, Is. 1, 65–74 (2005). https://doi.org/10.1007/s10924-004-1230-7 AbdulinaDRKoptevaZhPKoptevaAEVortmanM. Ya.Microbial destruction of polymeric materials: polyethylene foam, ethylene vinylacetate, and rubberMater. Sci.20225745625711:CAS:528:DC%2BB38XitFCqtLvJ10.1007/s11003-022-00579-w C. Belifore, M. V. Curia, and M. E. Farius, “Characterization of Rhodococcus sp. A5wh isolated from a high altitude Andean lake to unravel the survival strategy under lithium stress,” Rev. Argent. Microbiol., 50, Is. 3, 311–322 (2018). https://doi.org/10.1016/j.ram.2017.07.005 M. J. Larkin, L. A. Kulakov, and C. C. Allen, “Biodegradation and Rhodococcus – Masters of catabolic versatility,” Curr. Opin. Biotechnol., 16, Spec. Is. 3, 282–290 (2005). https://doi.org/10.1016/j.copbio.2005.04.007 AndreyukKIKozlovaIPKoptevaZhPPidlyashenko-NovokhatyiAIZaninaVVPurishLMMicrobial Corrosion of Underground Structures2005KyivNaukova Dumka[in Ukrainian] G. O. Iutynska, N. Ya. Vortman, D. R. Abdulina, Zh. P. Kopteva, A. Ye. Kopteva, A. V. Rudenko, V. V. Tretyak, V. N. Lemeshko, and V. V. Shevchenko, “Biodegradation and antimicrobial activity of guanidine-containing polyethylene oxide hydrogel,” Biotechnologia Acta, 13, Is. 4, 60–70 (2020). https://doi.org/10.15407/biotech13.04.060 KyrikovJBriassoulisEDBiodegradation of agricultural plastic films: A critical reviewJ. Polymer and the Environment2007151251501:CAS:528:DC%2BD2sXks1agu7g%3D10.1007/s10924-007-0053-8 M. Ya. Vortman, Zh. P. Kopteva, A. E. Kopteva D. R. Abdulina, G. O. Iutynska, V. N. Lemeshko, and V. V. Shevchenko, “Microbial degradation of polyeterguanidinacrylates,” Functional Mater., 29, Is. 1, 107–117 (2022). Zh. P. Kopteva , and V. V. Zanina, “Microbial biofilms on protective layers of underground metal structures,” Mikrobiol. Zhurnal., 70, Is. 4, 71–85 (2008). K. S. Mohan, and T. Srivastava, “Microbial deterioration and degradation of polymeric materials,” J. Biochem Techn., 2, Is. 4, 210–215 (2010). AhimouFSemmensMJHaugstadGNovakPJEffect of protein, polysaccharide, and oxygen concentration profiles on biofilm cohesivenessAppl. Environ. Microbiol.200773290529101:CAS:528:DC%2BD2sXlsFeqsbY%3D10.1128/AEM.02420-06173375651892893 S. Divjalakshmi, A. Subhashini, “Screening and isolation of polyethylene degrading bacteria from variouses soil enviroments,” J. of Environmental Sci. Toxicology and Food Techn., 10, 1–7 (2016). 803_CR3 803_CR4 803_CR5 803_CR6 J Kyrikov (803_CR13) 2007; 15 803_CR8 803_CR9 F Ahimou (803_CR14) 2007; 73 803_CR12 KI Andreyuk (803_CR1) 2005 803_CR10 DR Abdulina (803_CR7) 2022; 57 803_CR11 803_CR2 |
References_xml | – ident: 803_CR3 doi: 10.1007/s10924-004-1230-7 – ident: 803_CR5 doi: 10.15407/microbiol82.06.054 – volume: 73 start-page: 2905 year: 2007 ident: 803_CR14 publication-title: Appl. Environ. Microbiol. doi: 10.1128/AEM.02420-06 contributor: fullname: F Ahimou – volume-title: Microbial Corrosion of Underground Structures year: 2005 ident: 803_CR1 contributor: fullname: KI Andreyuk – ident: 803_CR2 – volume: 15 start-page: 125 year: 2007 ident: 803_CR13 publication-title: J. Polymer and the Environment doi: 10.1007/s10924-007-0053-8 contributor: fullname: J Kyrikov – ident: 803_CR12 doi: 10.1016/S0964-8305(03)00110-0 – ident: 803_CR4 doi: 10.1016/j.copbio.2005.04.007 – ident: 803_CR11 doi: 10.1016/j.ram.2017.07.005 – volume: 57 start-page: 562 issue: 4 year: 2022 ident: 803_CR7 publication-title: Mater. Sci. doi: 10.1007/s11003-022-00579-w contributor: fullname: DR Abdulina – ident: 803_CR8 – ident: 803_CR6 – ident: 803_CR9 doi: 10.15407/biotech13.04.060 – ident: 803_CR10 |
SSID | ssj0007575 |
Score | 2.3215358 |
Snippet | The fracture of guanidine-containing polymers and the chemical and physicomechanical properties of the synthesized materials under the influence of... |
SourceID | proquest crossref springer |
SourceType | Aggregation Database Publisher |
StartPage | 494 |
SubjectTerms | Bacteria Catalase Characterization and Evaluation of Materials Chemical synthesis Chemistry and Materials Science Materials Science Microorganisms Microscopy Polymers Polyurethane resins Solid Mechanics Structural Materials Tensile strength Thermogravimetric analysis |
Title | Microbial Destruction of Guanidine-Containing Polymers |
URI | https://link.springer.com/article/10.1007/s11003-024-00803-9 https://www.proquest.com/docview/3049776536 |
Volume | 59 |
hasFullText | 1 |
inHoldings | 1 |
isFullTextHit | |
isPrint | |
link | http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwlV1LT8MwDLbYdoEDb8RgTD1wg0xtkybrcUIbE2iIwyaNU5WkmTSBWiTGAX49TtpSnoeda1mt48SfG_szwHmAqIHrVBAjVUyY1CmJZRqTvkox4HFBA0f2PLnj4xm7mUfzuo_bFbtXN5LuoK573QI3-C5kxKIcSuIGtMrG09bg-uF2-HkAi8jx62Ky0ycY4OZlr8zfWr7Hoxpk_rgXdeFmtAPTqmmnqDJ57L2uVE-__-ZwXOdLdmG7hJ_eoPCXPdgw2T5sfSElPAA-WTpyJhSzSWlJL-vlCw_dKVtirDPEcloVoyW8-_zpzf77PoTZaDi9GpNyugLRofBXmDiyVPqRRkgi-4hjeCxUbKTRvlxQjkjBN5Lh6zGFyTcuYmi0sGz0CxVqqoykR9DM8swcgxdqgcJhqimTzARUBdpnCtVJi4a4acNFZePkuSDRSGq6ZGuNBK2ROGskcRs61TIk5YZ6SextoBA8orwNl5VZ68f_aztZT_wUNu1A-aJgpQNNtLI5Q9ixUt3SzbrQmIWDD8hZzMk |
link.rule.ids | 315,783,787,27936,27937,41093,41535,42162,42604,52123,52246 |
linkProvider | Springer Nature |
linkToHtml | http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwlV1LT8MwDLZgOwAH3ojBgB64QaY2TZP1OKGNwR7isEnjVCVpJk2gDmnjAL8epw8KExx2rmWljht_ruPPANceogauY0GMVCFhUscklHFImirGgMeF76Vkz4Mh747Z4ySY5E1hi-K2e1GSTE_qstnNSyffUUYszPFJuAlVRj1OK1Bt3T_32t8nsAhSgl3MdpoEI9wkb5b5W8vvgFSizJXCaBpvOnswLlaaXTN5abwvVUN_rpA4rvsq-7CbA1CnlXnMAWyY5BB2ftASHgEfzFJ6JhSzaWlOMOvMpw46VDLDaGeIZbXKhks4T_PXD_v3-xjGnfborkvy-QpEU-EuMXVksXQDjaBENhHJ8FCo0EijXTn1OWIF10iGy2MK02_cRmq0sHz0U0W1r4z0T6CSzBNzCg7VAoVprH0mmfF85WmXKVQnLR7ipgY3hZGjt4xGIyoJk601IrRGlFojCmtQL_Yhyj-pRWTrgULwwOc1uC3MWj7-X9vZeuJXsNUdDfpR_2HYO4dtO14-u75Shwpa3FwgCFmqy9znvgAZ0s-0 |
linkToPdf | http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwpV1LT8MwDLZgkxAceCMGA3rgBhl9ZMl6nGBjMDbtwKRxqpI0lSZQN4lygF-P0wcdExwQ51pW6jj158b-DHDuIGpgKuREC-kTKlRIfBH6pCVDDHiMe05K9jwYst6Y3k-ak4Uu_rTavbiSzHoaDEtTnFzNw-iqbHxz0il4LiUG8njEX4UqNcxIFai2b5_6na-vMW-mZLuY-bQIRrtJ3jjzs5bvwalEnEuXpGns6W6BKFadlZw8N94S2VAfS4SO_3mtbdjMganVzjxpB1Z0vAsbC3SFe8AG05S2CcVMupoTz1qzyEJHi6cYBTUxbFfZ0AlrNHt5N3_F92Hc7Txe90g-d4Eol9sJppQ0FHZTIVgRLUQ4zOfS10IrW0QeQwxha0FxeVRiWo7b62rFDU99JF3lSS28A6jEs1gfguUqjsJuqDwqqHY86SibSlQnDE5iugYXhcGDeUavEZREysYaAVojSK0R-DWoF3sS5EftNTD3hJyzpsdqcFmYuHz8u7ajv4mfwdrophs83A37x7Bups5nVS11qKDB9Qlik0Se5u73CcgG2Jg |
openUrl | ctx_ver=Z39.88-2004&ctx_enc=info%3Aofi%2Fenc%3AUTF-8&rfr_id=info%3Asid%2Fsummon.serialssolutions.com&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.atitle=Microbial+Destruction+of+Guanidine-Containing+Polymers&rft.jtitle=Materials+science+%28New+York%2C+N.Y.%29&rft.au=Kopteva%2C+Zh.+O.&rft.au=Vortman%2C+M.+Ya&rft.au=Iutynska%2C+G.+O.&rft.au=Kopteva%2C+G.+E.&rft.date=2023-12-01&rft.issn=1068-820X&rft.eissn=1573-885X&rft.volume=59&rft.issue=4&rft.spage=494&rft.epage=503&rft_id=info:doi/10.1007%2Fs11003-024-00803-9&rft.externalDBID=n%2Fa&rft.externalDocID=10_1007_s11003_024_00803_9 |
thumbnail_l | http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/lc.gif&issn=1068-820X&client=summon |
thumbnail_m | http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/mc.gif&issn=1068-820X&client=summon |
thumbnail_s | http://covers-cdn.summon.serialssolutions.com/index.aspx?isbn=/sc.gif&issn=1068-820X&client=summon |