{"id":466,"date":"2020-05-15T06:45:19","date_gmt":"2020-05-15T06:45:19","guid":{"rendered":"http:\/\/web.fs.uni-lj.si\/lasteh\/?p=466"},"modified":"2020-05-27T09:18:15","modified_gmt":"2020-05-27T09:18:15","slug":"interakcija-med-kostnimi-celicami-in-lasersko-obdelano-kovinsko-povrsino","status":"publish","type":"post","link":"https:\/\/web.fs.uni-lj.si\/lasteh\/2020\/05\/15\/interakcija-med-kostnimi-celicami-in-lasersko-obdelano-kovinsko-povrsino\/","title":{"rendered":"Interakcija med kostnimi celicami in lasersko obdelano kovinsko povr\u0161ino"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Znotraj raziskovalnega ARRS projekta <a href=\"https:\/\/www.fs.uni-lj.si\/raziskovalna_dejavnost\/raziskovalna_dejavnost\/nacionalni_projekti\/2020032618555690\/Lasersko%20mikro%20in%20nanostrukturiranje%20za%20razvoj%20biomimeti%C4%8Dnih%20kovinskih%20povr%C5%A1in%20z%20edinstvenimi%20lastnostmi%20(LaMiNaS)\" target=\"_blank\" rel=\"noreferrer noopener\">Lasersko mikro in nanostrukturiranje za razvoj biomimeti\u010dnih kovinskih povr\u0161in z edinstvenimi lastnostmi (LaMiNaS)<\/a> smo preu\u010dili, kako lasersko teksturiranje nerjavnega jekla z nanosekundnimi bliski vpliva na interakcijo med funkcionalizirano kovinsko povr\u0161ino in kostnimi celicami. Rezultati, ki smo jih objavili v reviji <a href=\"https:\/\/doi.org\/10.1016\/j.surfcoat.2020.125878\" target=\"_blank\" rel=\"noreferrer noopener\">Surface and Coatings Technology<\/a>, ka\u017eejo, da razvoj nanostrukturirega povr\u0161inskega oksida zmanj\u0161a adhezijo celic in povzro\u010di celi\u010dni stres.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"665\" height=\"262\" src=\"http:\/\/web.fs.uni-lj.si\/lasteh\/wp-content\/uploads\/2020\/05\/image-26.png\" alt=\"\" class=\"wp-image-467\" srcset=\"https:\/\/web.fs.uni-lj.si\/lasteh\/wp-content\/uploads\/2020\/05\/image-26.png 665w, https:\/\/web.fs.uni-lj.si\/lasteh\/wp-content\/uploads\/2020\/05\/image-26-300x118.png 300w\" sizes=\"(max-width: 665px) 100vw, 665px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Obsevanje kovinskih povr\u0161in z laserskimi bliski visokih fluenc v atmosferi, ki vsebuje kisik, neizogibno povzro\u010di spremembo povr\u0161inske topografije, kemije in omo\u010dljivosti. Te spremembe pomembno vplivajo na interakcije med celicami in povr\u0161ino ter posledi\u010dno na biokompatibilnost povr\u0161in.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">V sodelovanju med LASTEH, In\u0161titutom za kovinske materiale in tehnologije (IMT) ter Oddelkom za biologijo na Biotehni\u0161ki fakulteti Univerze v Ljubljani smo raziskali, kako lasersko teksturiranje z nanosekundnim Nd:YAG laserjem vpliva na adhezijo in morfologijo modelnih \u010dlove\u0161kih kotnih celic (MG63). Rezultati razkrivajo, da za\u010detna interakcija (v prvih 24 urah) med celicami in lasersko spremenjeno povr\u0161ino povzro\u010di spremembo oblike celice iz poligonalne v okroglo. S tem se zmanj\u0161a povr\u0161ina celice in stika celice s podlago. Celice na lasersko spremenjenih povr\u0161inah so manj razra\u0161\u010dene, s kratkimi cevastimi izrastki ter prekomerno ekspresijo zunajceli\u010dnih veziklov, kar redko opazimo na neobdelanih in steklenih kontrolnih vzorcih. Do tega najverjetneje pride zaradi nastanka nanostrukturiranih, visokotemperaturnih oksidov, ki so posledica laserske ablacije. Analiza povr\u0161inske kemije lasersko obdelanih povr\u0161in s spektroskopijo fotoelektronov, vzbujenih z rentgenskimi \u017earki (XPS) razkrije vsebnost heksavalentnega kromovega oksid. Ta je bolj toksi\u010den od naravnega oksidnega sloja na neobdelanih vzorcih.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Predstavljeni rezultati ka\u017eejo, da se kostne celice \u017ee v prvih 24 urah odzovejo na kombinacijo spremenjene povr\u0161inske topografije, hrapavosti in omo\u010dljivosti. Dose\u017eeni rezultati potrjujejo velik potencial laserskega in\u017eeniringa povr\u0161in kot metode za obvladovanje\/doseganje\u00a0 biokompatibilnosti povr\u0161in. Nadaljnje raziskave bodo usmerjene v laserske obdelave v razli\u010dnih plinskih atmosferah (N<sub>2<\/sub>, Ar in CO<sub>2<\/sub>). Sestava okoli\u0161ke atmosfere med lasersko obdelavo namre\u010d pomembno vpliva na povr\u0161insko kemijo in topografijo. Znanstveni \u010dlanek je prosto dostopen (pod pogoji CC BY 4.0 licence) na: <a href=\"https:\/\/doi.org\/10.1016\/j.surfcoat.2020.125878\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/doi.org\/10.1016\/j.surfcoat.2020.125878<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Znotraj raziskovalnega ARRS projekta Lasersko mikro in nanostrukturiranje za razvoj biomimeti\u010dnih kovinskih povr\u0161in z edinstvenimi lastnostmi (LaMiNaS) smo preu\u010dili, kako [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":467,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-466","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novice"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Interakcija med kostnimi celicami in lasersko obdelano kovinsko povr\u0161ino - 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