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61.
Byung-Yong Lee Kris Behler Murat Erdem Kurtoglu Meghan Ann Wynosky-Dolfi Richard F. Rest Yury Gogotsi 《Journal of nanoparticle research》2010,12(7):2511-2519
This article reports on titanium dioxide (TiO2)-coated nanofibers deposited on a filter surface by the electrospinning process. After depositing a micrometer-thick film
of polyamide 11 nanofibers on polypropylene fabric, TiO2 nanoparticles can be directly electrosprayed onto the nanofibers. X-ray diffraction and Raman spectroscopy showed minimal
change in the phase composition (anatase and rutile) and no change in the particle size of nanocrystalline TiO2 after coating. Scanning electron microscopy demonstrated that nanofibers were uniformly coated by titanium dioxide nanoparticles
without agglomeration. TiO2-coated filters showed excellent photocatalytic-bactericidal activity and photo-induced hydrophilicity. 相似文献
62.
Klaas W. Decoene Kamil Unal An Staes Olivier Zwaenepoel Jan Gettemans Kris Gevaert Johan M. Winne Annemieke Madder 《Chemical science》2022,13(18):5390
Labelling of tyrosine residues in peptides and proteins has been reported to selectively occur via a ‘tyrosine-click’ reaction with triazolinedione reagents (TAD). However, we here demonstrate that TAD reagents are actually not selective for tyrosine and that tryptophan residues are in fact also labelled with these reagents. This off-target labelling remained under the radar as it is challenging to detect these physiologically stable but thermally labile modifications with the commonly used HCD and CID MS/MS techniques. We show that selectivity of tryptophan over tyrosine can be achieved by lowering the pH of the aqueous buffer to effect selective Trp-labelling. Given the low relative abundance of tryptophan compared to tyrosine in natural proteins, this results in a new site-selective bioconjugation method that does not rely on enzymes nor unnatural amino acids and is demonstrated for peptides and recombinant proteins.A new strategy for selective tryptophan modification using triazolinedione (TAD) chemistry at pH 4 is shown on peptides and proteins. Additionally, off-target modification of tryptophan residues during the classical TAD-Y click reaction is uncovered. 相似文献
63.
Kris Matyjaszewski 《Journal of Polymer Science.Polymer Physics》1991,29(2):263-263
64.
Au nanoparticles encapsulated within polystyrene-block-poly(acrylic acid) (PS-b-PAA) micelles assemble into regular, one-dimensional arrays when they are exposed to solvent conditions that relax interfacial curvature in the micellar shell. Nanoparticle chaining was induced by adding salt, acid, or cationic carbodiimide to the suspension of purified encapsulated Au nanoparticles (Au@PS-b-PAA). The resulting assemblies were characterized by scanning and transmission electron microscopies, by dark-field optical microscopy, and by visible absorption spectroscopy. The length of the chains was modulated by varying the concentration of additive. More importantly, the spacing between Au nanoparticles was dictated entirely by the shell thickness of the Au@PS-b-PAA starting material. Far-field polarization microspectroscopy demonstrated directional surface plasmon coupling in a straightened nanoparticle chain, which is a basic requirement for the use of these assemblies as plasmon waveguides. 相似文献
65.
Kris Coolsaet 《Designs, Codes and Cryptography》2008,47(1-3):75-97
We construct an embedding of the Ree–Tits generalized octagon defined over a field K in a 51-dimensional projective space over K arising from a 52-dimensional Lie algebra J of type . This construction derives from a quadratic map (related to a ‘standard’ duality of ) from the 26-dimensional module (see K. Coolsaet, Adv Geometry, to appear) into J. (This embedding is full if and only if K is a perfect field.) We provide explicit formulas for the coordinates of the points of the octagon in this embedding, in
terms of their Van Maldeghem coordinates. We apply these results to compute the dimensions of subspaces generated by various
special subsets of points of the octagon: the sets of points at a fixed distance from a given point or a given line and the
Suzuki suboctagons. The results depend on whether K is the field of 2 elements, or not.
相似文献
66.
Bioanalysis, a key supporting function for generating data for pre‐clinical and clinical studies in drug development, is under the regulation of local agencies as well as global organizations to ensure the data integrity and quality in submission. As major regulatory agencies and organizations, the US Food and Drug Administration, the European Medicines Agency and the International Council for Harmonization of Technical Requirements for Pharmaceuticals for Human Use have been updating their industry guidance for bioanalytical method validation, to keep up with the development new modalities, technologies and regulations. This article summarizes the recent updates and any clarifications and controversies triggered by those updates. Perspectives and recommendations are given based on our own experience as well as commonly accepted practice in the bioanalytical community. 相似文献
67.
68.
The first part of this two-part paper (13) described the developmentof a new freshman business mathematics (FBM) course at our college.In this paper, we discuss our assessment tool, the businessmemo, as a venue for students to apply mathematical skills,via mathematical modelling, to realistic business problems.These memos have proven a crucial step in turning our FBM coursearound from a dreaded course with little connection to studentsintended careers into a course where students experience thepower of mathematics for solving problems and informing decisions.Comments from students in the course throughout its 6-year historyclearly point to the course's value and importance. 相似文献
69.
70.
Kim JH Yeo WH Shu Z Soelberg SD Inoue S Kalyanasundaram D Ludwig J Furlong CE Riley JJ Weigel KM Cangelosi GA Oh K Lee KH Gao D Chung JH 《Lab on a chip》2012,12(8):1437-1440
A rapid, accurate tuberculosis diagnostic tool that is compatible with the needs of tuberculosis-endemic settings is a long-sought goal. An immunofluorescence microtip sensor is described that detects Mycobacterium tuberculosis complex cells in sputum in 25 minutes. Concentration mechanisms based on flow circulation and electric field are combined at different scales to concentrate target bacteria in 1 mL samples onto the surfaces of microscale tips. Specificity is conferred by genus-specific antibodies on the microtip surface. Immunofluorescence is then used to detect the captured cells on the microtip. The detection limit in sputum is 200 CFU mL(-1) with a success rate of 96%, which is comparable to PCR. 相似文献