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RISS 인기검색어
- 검색키워드
- 저자 : Rader, O. (검색결과 4 건)
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Crosslinked Ionic Alginate and Cellulose-based Hydrogels for Photoresponsive Drug Release Systems
Fang Zhou,Shaohua Wu,Chris Rader,Jianwei Ma,Shaojuan Chen,Xiaoyan Yuan,E Johan Foster 한국섬유공학회 2020 Fibers and polymers Vol.21 No.1
In this work, photosensitive alginate and cellulose-based hydrogels with interpenetrating polymer networks weresuccessfully prepared from alginate, TEMPO-oxidized cellulose nanofibers (TEMPO-CNFs) and polyacrylamide,crosslinked by both Fe3+ and N,N'-methylenebis-acrylamide. The obtained hydrogels showed a clear relationship between themechanical properties and the content of the TEMPO-CNFs. The results indicated that the mechanical properties ofcrosslinked hydrogels were enhanced with the mass ratio of TEMPO-CNFs and alginate increased from 1/2 to 2. Moreover,the crosslinked ionic alginate and cellulose-based hydrogels with various TEMPO-CNFs contents exhibited aninterconnected porous morphology with an average pore size of ca. 130 μm, and demonstrated an increased cumulativerelease amount of BSA drugs under the ultraviolet irradiation. This study demonstrated that the as-prepared photoresponsivehydrogels would have a potential application as local drug release systems for wound dressings.
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From rabbit antibody repertoires to rabbit monoclonal antibodies
Justus Weber,Haiyong Peng,Christoph Rader 생화학분자생물학회 2017 Experimental and molecular medicine Vol.49 No.-
In this review, we explain why and how rabbit monoclonal antibodies have become outstanding reagents for laboratory research and increasingly for diagnostic and therapeutic applications. Starting with the unique ontogeny of rabbit B cells that affords highly distinctive antibody repertoires rich in in vivo pruned binders of high diversity, affinity and specificity, we describe the generation of rabbit monoclonal antibodies by hybridoma technology, phage display and alternative methods, along with an account of successful humanization strategies.
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X-ray natural birefringence in reflection from graphene
Jansing, C.,Mertins, H.-Ch.,Gilbert, M.,Wahab, H.,Timmers, H.,Choi, S.-H.,Gaupp, A.,Krivenkov, M.,Varykhalov, A.,Rader, O.,Legut, D.,Oppeneer, P. M. American Physical Society 2016 Physical Review B Vol.94 No.4
<P>The existence of natural birefringence in x-ray reflection on graphene is demonstrated at energies spanning the carbon 1s absorption edge. This new x-ray effect has been discovered with precision measurements of the polarization-plane rotation and the polarization-ellipticity changes that occur upon reflection of linearly polarized synchrotron radiation on monolayer graphene. Extraordinarily large polarization-plane rotations of up to 30 degrees, accompanied by a change from linearly to circularly polarized radiation have been measured for graphene on copper. Graphene on single crystalline cobalt, grown on tungsten, exhibits rotation values of up to 17 degrees. Both graphene systems show resonantly enhanced effects at the pi* and sigma* energies. The results are referenced against those obtained for polycrystalline carbon and highly oriented pyrolytic graphite (HOPG), respectively. As expected, polycrystalline carbon shows negligible rotation, whereas a huge maximum rotation of 140 degrees has been observed for HOPG that may be considered a graphene multilayer system. HOPG is found to exhibit such large rotation values over a broad energy range, even well beyond the pi* resonance energy due to the contributions of numerous graphene layers. To explain the origin of the observed natural birefringence of graphene, the Stokes parameters as well as the x-ray natural linear dichroism in reflection have been determined. It is shown that the birefringence directly results from the optical anisotropy related to the orthogonal alignment of pi* and sigma* bonds in the graphene layer. Our polarization analysis reveals a strong bonding of graphene on Co with a reduced sigma* excitation energy and a strong tilt of 50% of the p(z) orbitals towards diagonal orientation. In contrast, graphene on Cu is weakly bound with an orthogonal orientation of the p(z) orbitals. Exhibiting such a large natural birefringence that can be controlled through substrate choice, and because of excellent heat conductivity, graphene materials have a potential to be used as tunable x-ray phase shifting lambda/4 or lambda/2 plates in the design of future high-intensity light sources.</P>
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