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</o:shapelayout></xml><![endif]--></head><body lang=SL link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Vabimo vas na 6. predavanje iz sklopa "Kolokviji na IJS" v letu 2016/17, ki bo <strong><span style='color:red'>v sredo, 26. oktobra 2016, ob 13. uri </span></strong><span style='color:red'>v Veliki predavalnici Instituta »Jožef Stefan«</span>  na Jamovi cesti 39 v Ljubljani. Napovednik predavanja najdete tudi na naslovu <a href="http://www.ijs.si/ijsw/Koledar_prireditev">http://www.ijs.si/ijsw/Koledar_prireditev</a>, posnetke preteklih predavanj<span style='color:blue'> </span>pa na <a href="http://videolectures.net/kolokviji_ijs">http://videolectures.net/kolokviji_ijs</a>. <o:p></o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<o:p></o:p></p><p class=MsoNormal><b><span lang=EN-US style='mso-fareast-language:ZH-CN'>prof. dr. Francesc Sagués<o:p></o:p></span></b></p><p class=MsoNormal><i><span lang=EN-US style='mso-fareast-language:ZH-CN'>Univerza v Barceloni, Barcelona, Španija<o:p></o:p></span></i></p><p class=MsoNormal><b><span style='font-size:14.0pt'><o:p> </o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:16.0pt'>Aktivni nematiki na površinah<o:p></o:p></span></b></p><p class=MsoNormal style='text-align:justify'><span style='font-size:11.0pt;font-family:"Arial",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:justify'><span lang=EN-US>Aktivni teko</span>č<span lang=EN-US>i kristali so nova vrsta mehkih snovi, za katere vlada v zadnjem </span>č<span lang=EN-US>asu zelo veliko zanimanje. Rekonstituirane suspenzije citoskeletnih filamentov skupaj s proteinskimi motorji so se npr. pokazale kot izvrsten sistem za kvantitativne raziskave izvora znotrajceli</span>č<span lang=EN-US>ne organizacije. Tu mislimo na sistem, razvit v skupini Z. Dogica (Univerza Brandeis): tega tvori sveženj mikrotubulov s kinezinskimi molekularni motorji, ki jih napaja ATP. Osredoto</span>č<span lang=EN-US>ili se bomo na dvorazsežne preparate, za katere je zna</span>č<span lang=EN-US>ilna nematska tekstura in hidrodinami</span>č<span lang=EN-US>ni tok, ki je lahko bodisi dokaj urejen bodisi navidez kaoti</span>č<span lang=EN-US>en. Predstavili bomo razli</span>č<span lang=EN-US>ne scenarije obna</span>š<span lang=EN-US>anja tega aktivnega nematskega sistema v odvisnosti od okolne kapljevine. V najenostavnej</span>š<span lang=EN-US>em primeru je sistem v stiku z izotropnimi olji razli</span>č<span lang=EN-US>nih viskoznosti in tu lahko ocenimo doslej neznano strižno viskoznost nematske plasti. Še bolj zanimiva  je situacija, kjer je pasivna okolna kapljevina kar teko</span>či<span lang=EN-US> kristal v  smekti</span>č<span lang=EN-US>ni fazi, ki omogo</span>č<span lang=EN-US>a povsem nove strategije nadzora aktivega toka. Na kratko se bomo dotaknili tudi drugih scenarijev, zna</span>č<span lang=EN-US>ilnih za enkapsulirane aktivne nematike v stiku z izotropnimi in anizotropnimi olji.<o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:justify'>Predavanje bo v angleščini.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><strong><span style='font-family:"Calibri",sans-serif;color:red'>Lepo vabljeni!</span></strong><strong><span style='font-weight:normal'><o:p></o:p></span></strong></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><span style='font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-language:SL'><br clear=all style='page-break-before:always'></span><p class=MsoNormal><span style='color:black'>We invite you to the 6th Institute colloquium in the academic year 2016/17. The colloquium will be held </span><b><span style='color:red'>on Wednesday October 26, 2016 at 1 PM</span></b><span style='color:red'> in <b>the main Institute lecture hall</b></span><span style='color:black'>, Jamova 39, Ljubljana. To read the abstract click  </span><span style='color:#1F497D'><a href="http://www.ijs.si/ijsw/Koledar_prireditev">http://www.ijs.si/ijsw/Koledar_prireditev</a>. </span><span style='color:black'>Past colloquia are posted on</span><span style='color:#1F497D'>  <a href="http://videolectures.net/kolokviji_ijs">http://videolectures.net/kolokviji_ijs</a>.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='margin-bottom:12.0pt'>********************************************<b><o:p></o:p></b></p><p class=MsoNormal><b><span lang=EN-US>prof. dr. Francesc Sagués<o:p></o:p></span></b></p><p class=MsoNormal><i><span lang=EN-US>Universitat de Barcelona, Barcelona, Spain<o:p></o:p></span></i></p><p class=MsoNormal><b><span style='font-size:16.0pt;mso-fareast-language:ZH-CN'><o:p> </o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><b><span lang=EN-US style='font-size:16.0pt'>Active nematics at interfaces<o:p></o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><o:p> </o:p></p><p class=MsoNormal align=center style='text-align:center'><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US>Active liquid crystals are a new class of soft materials that have recently raised a huge interest. In particular, reconstituted suspensions of cytoskeletal filaments and associated motor proteins have proven ideal for quantitative studies of the origin of subcellular organization. Here we refer to the system initially engineered by the group of Z. Dogic (Brandeis University), consisting of bundled microtubules powered by ATP-fueled kinesin motors. We concentrate on two-dimensional preparations showing nematic textures and streaming flows, from largely-organized to seemingly chaotic. We will present results on different scenarios where this active nematics system is conditioned with interfacial fluids. The simplest situation corresponds to prepare them in contact with isotropic oils of different viscosities. From this we can extract a prediction for the as of now unknown shear viscosity of the nematic film. More striking is the situation when the contacting passive fluid is a liquid crystal in its smectic phase. In this latter situation a totally unprecedented strategy of control of the active flows has been recently demonstrated. Other scenarios corresponding to encapsulated active nematics, both in contact with isotropic and anisotropic oils will be briefly presented.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal>Cordially invited!<o:p></o:p></p></div></body></html>