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排序方式: 共有196条查询结果,搜索用时 15 毫秒
191.
Carlsen A Higashiya S Topilina NI Dunn KA Geer RE Eisenbraun ET Kaloyeros AE Welch JT 《Macromolecular bioscience》2012,12(2):269-273
Recently, well-ordered biological materials have been exploited to pattern inorganic nanoparticles into linear arrays that are of particular interest for nanoelectronic applications. In this work, a de novo designed E. coli-expressed polypeptide (previously shown to form highly rectilinear, β-sheet-containing structures) operates as a template for divalent metal cations. EDX and TEM analysis verify the attachment of platinum ions to the histidine-rich fibril surface, which was designed specifically to facilitate attachment of chemical moieties. Following chemical reduction, TEM further confirms the formation of localized zero-valent metal aggregates with sub-nanometer interparticle spacing. 相似文献
192.
Biomimetic materials which display the complexity of biominerals like nacre are synthetically difficult to prepare. The formation of chitin/calcium carbonate composites, where CaCO(3) is present as aragonite, was achieved via reacetylation of preformed chitosan scaffolds followed by the combination of presoaking of chitin templates with mineral solutions in the presence of poly(acrylic acid). The as-synthesised composites are comprised of well-ordered ribbons of aragonite crystals held within an organic matrix, mimicking the structure of nacre. 相似文献
193.
Michael I. Bruce Natasha N. Zaitseva Brian W. Skelton 《Journal of organometallic chemistry》2006,691(20):4273-4280
Reactions of {(Ph3P)AuCC}2CC{CCAu(PPh3)}2 (1b), with Co3(μ-CBr)(μ-dppm)n(CO)9−2n (n = 0, 1) result in complete or partial elimination of AuBr(PPh3) to give the complexes {(OC)9Co3-μ3-CCC}2CC{CC-μ3-CCo3(CO)9}2 (3), trans-{(OC)7(μ-dppm)Co3-μ3-CCC}(HCC)CC{CCAu(PPh3)}{CC-μ3-CCo3(μ-dppm)(CO)7} (4), {(OC)7(μ-dppm)Co3-μ3-CCC}2CC(CCH){CC-μ3-CCo3(μ-dppm)(CO)7} (5) and {(OC)7(μ-dppm)Co3-μ3-CCC}2CC{CCAu(PPh3)}{CC-μ3-CCo3(μ-dppm)(CO)7} (6), which have been identified by spectroscopic methods and in the cases of 3, 4 and 5, by single-crystal X-ray diffraction methods. 相似文献
194.
195.
In this paper, we discuss the study of some signal processing problems within Bayesian frameworks and semigroups theory, in the case where the Banach space under consideration may be nonseparable. For applications, the suggested approach may be of interest in situations where approximation in the norm of the space is not possible. We describe the idea for the case of the abstract Cauchy problem for the evolution equation and provide more detailed example of the diffusion equation with the initial data in the nonseparable Morrey space. 相似文献
196.
Natasha Bokhari Abida Yasmeen Asif Ali Hamad Khalid Rong Wang Mustehsan Bashir Faiza Sharif 《Macromolecular bioscience》2023,23(9):2300039
Meshes from natural silk are hand knitted and surface functionalized to facilitate hernia repair and other load bearing, tissue applications. Purified organic silk is - hand knitted and then coated with chitosan (CH)/bacterial cellulose (BC) blend polymer using four phytochemicals such as pomegranate (PG) peel, Nigella sativa (NS) seed, Licorice root (LE), and Bearberry leaf extracts (BE) separately. Characterizations using GCMS analysis shows the presence of bioactive chemicals in the extracts. Scanning electron microcopy (SEM) shows that the surface is coated with the composite polymer t. Fourier transform infrared spectroscopy (FTIR) shows significant elements found in CH, BC, and phytochemicals in plant extracts with no chemical changes. Tensile strength of the coated meshes is higher to support tissue as implants. The release kinetics suggest sustained release of phytochemical extracts. In vitro studies confirmed the noncytotoxic, biocompatible, wound healing potential of the meshes. Furthermore, gene expression analysis of 3-wound healing genes shows marked increase in the in vitro cell cultures due to the presence of extracts. These results suggest that the composite meshes can efficiently support hernia closure while facilitating wound/tissue healing and combating bacterial infections. Therefore, these meshes can be good candidates for fistula and cleft palate repair. 相似文献