{"id":30722,"date":"2017-07-24T10:58:43","date_gmt":"2017-07-24T08:58:43","guid":{"rendered":"http:\/\/ibecbarcelona.eu\/?p=30722\/"},"modified":"2017-07-26T09:57:01","modified_gmt":"2017-07-26T07:57:01","slug":"un-metode-de-nanoscopia-mostra-les-vies-de-transferencia-delectrons","status":"publish","type":"post","link":"https:\/\/ibecbarcelona.eu\/ca\/un-metode-de-nanoscopia-mostra-les-vies-de-transferencia-delectrons\/","title":{"rendered":"Un m\u00e8tode de nanosc\u00f2pia mostra les vies de transfer\u00e8ncia d&#8217;electrons"},"content":{"rendered":"<p>La transfer\u00e8ncia d&#8217;electrons en prote\u00efnes \u00e9s essencial en processos biol\u00f2gics crucials; La respiraci\u00f3 cel\u00b7lular, per exemple, consisteix en l&#8217;oxidaci\u00f3 de glucosa a CO<sub>2<\/sub> i la reducci\u00f3 d&#8217;oxigen en aigua. Tot i que els aspectes b\u00e0sics de la transfer\u00e8ncia d&#8217;electrons han estat estudiats a fons, fins al moment no hi ha hagut cap eina capa\u00e7 d&#8217;examinar els canals nanom\u00e8trics pels que els electrons es transfereixen.<\/p>\n<h6 class=\"caption\" style=\"float: left; width: 30%; padding: 0px 30px 10px 0px;\">A dalt: Imatges simult\u00e0nies d&#8217;alta resoluci\u00f3: el nou m\u00e8tode, DECC, a la dreta. Una \u00fanica prote\u00efna azurina mostra un punt submolecular amb alta conduct\u00e0ncia diferencial envoltada per una regi\u00f3 de conduct\u00e0ncia inferior. A sota: vista de planta d&#8217;una proteina Azurina sobre una superf\u00edcie d&#8217;or plana a nivell at\u00f2mic. La prote\u00efna est\u00e0 adherida a la superf\u00edcie a trav\u00e9s d&#8217;un parell de residus de ciste\u00efna (en verd); els residus hidrof\u00f2bics (en blau) envolten el centre redox (marr\u00f3).<\/h6>\n<p>El grup de l&#8217;IBEC, expert en microsc\u00f2pia d&#8217;efecte t\u00fanel electroqu\u00edmica, ha incorporat la t\u00e8cnica de modulaci\u00f3 per corrent altern a aquesta microsc\u00f2pia permetent-los mesurar les propietats electr\u00f2niques locals d&#8217;un el\u00e8ctrode, aix\u00ed com els processos redox que succeeixen en la interfase entre l&#8217;el\u00e8ctrode i la soluci\u00f3 d&#8217;immersi\u00f3. \u201cAquest m\u00e8tode, la microsc\u00f2pia de Conducci\u00f3 Electroqu\u00edmica Diferencial (o DECC, de l&#8217;angl\u00e8s Differential Electrochemical Conductance imaging), ens ha perm\u00e8s veure l&#8217;oxidaci\u00f3 reversible d&#8217;un el\u00e8ctrode de ferro en la nanoescala\u201d, diu la primera autora de l&#8217;estudi Montserrat L\u00f3pez, una estudiant de doctorat al grup del professor ICREA Pau Gorostiza Nanoprobes and Nanoswitches. \u201cTamb\u00e9 ho hem fet servir per obtenir imatges d&#8217;un sistema redox biomolecular, la prote\u00efna Azurina immobilitzada sobre or\u201d.<\/p>\n<p>En particular, els investigadors van ser capa\u00e7os de veure les regions submoleculars amb alta conduct\u00e0ncia que actuen com a vies per a la transfer\u00e8ncia d&#8217;electrons dins de la prote\u00efna. A m\u00e9s de permetre importants avan\u00e7os en bioqu\u00edmica i bionanotecnologia, aquest m\u00e8tode tamb\u00e9 obrir\u00e0 noves possibilitats per al disseny i optimitzaci\u00f3 de l&#8217;electr\u00f2nica molecular, on els compostos sint\u00e8tics s\u00f3n components per a la construcci\u00f3 de dispositius nanoelectr\u00f2nics.<\/p>\n<p>&#8212;<\/p>\n<p><em><strong>Article de refer\u00e8ncia:<\/strong> <\/em>M. L\u00f3pez-Mart\u00ednez, J. M. Art\u00e9s, V. Sarasso, M. Carminati, I. D\u00edez-P\u00e9rez, F. Sanz, &amp; P. Gorostiza (2017). <a href=\"http:\/\/onlinelibrary.wiley.com\/doi\/10.1002\/smll.201700958\/abstract\" target=\"_blank\" rel=\"noopener\">Differential Electrochemical Conductance Imaging at the Nanoscale<\/a>. <em>Small<\/em>, epub ahead of print<\/p>\n","protected":false},"excerpt":{"rendered":"<h3><img decoding=\"async\" data-src=\"https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2017\/07\/small_Pau.jpg\" alt=\"\" width=\"400\" height=\"377\" class=\"left size-full wp-image-30677 lazyload\" data-srcset=\"https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2017\/07\/small_Pau.jpg 400w, https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2017\/07\/small_Pau-300x283.jpg 300w, https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2017\/07\/small_Pau-138x130.jpg 138w, https:\/\/ibecbarcelona.eu\/wp-content\/uploads\/2017\/07\/small_Pau-150x141.jpg 150w\" data-sizes=\"(max-width: 400px) 100vw, 400px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 400px; --smush-placeholder-aspect-ratio: 400\/377;\" \/>Un grup de l&#8217;IBEC ha desenvolupat una nova t\u00e8cnica de microsc\u00f2pia capa\u00e7 de mesurar la conduct\u00e0ncia de mol\u00e8cules individuals, obrint la porta a revelar els mecanismes moleculars que s&#8217;amaguen darrere de processos biol\u00f2gics com la respiraci\u00f3, la fotos\u00edntesi i la regeneraci\u00f3<\/h3>\n<p>En la seva publicaci\u00f3 de la revista <em>Small<\/em>, el grup <a href=\"https:\/\/ibecbarcelona.eu\/nanoprobes\" target=\"_blank\" rel=\"noopener\">Nanoprobes and Nanoswitches<\/a> descriu una nova forma d&#8217;observar les vies de conducci\u00f3 en les prote\u00efnes i complexos redox &#8211; en les quals la transfer\u00e8ncia d&#8217;electrons causa un canvi d&#8217;oxidaci\u00f3 &#8211; a la nanoescala.<\/p>\n","protected":false},"author":4,"featured_media":30677,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[96],"tags":[],"post_formats":[],"class_list":["post-30722","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-noticies-de-recerca"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Un m\u00e8tode de nanosc\u00f2pia mostra les vies de transfer\u00e8ncia d&#039;electrons - Institute for Bioengineering of Catalonia<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ibecbarcelona.eu\/ca\/un-metode-de-nanoscopia-mostra-les-vies-de-transferencia-delectrons\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta 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