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排序方式: 共有96条查询结果,搜索用时 15 毫秒
1.
An attempt was made to elucidate the relationship between chemical structure, in terms of glass transition temperature (Tg), and conversion temperature (TTR) of thermally rearranged polybenzoxazole membranes, by analyzing DSC and TGA data for a total of 15 sets of o-hydroxypolyimides and copolyimides, derived from two experimental and four commercial structurally different diamines, as well as four different dianhydride monomers. Our research revealed that TTR was influenced by chain ridigity of o-hydroxypolyimides, and exhibited a linear relationship with Tg. Therefore, structure and thermal property of o-hydroxypolyimide should be considered when studying TR polymers to determine thermal conversion to polybenzoxazole. 相似文献
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Karolina Salwierak-Gona Pawe Pitek Magorzata Domowicz Mariola
widerek-Matysiak 《International journal of molecular sciences》2022,23(4)
Multiple sclerosis (MS) is a neurological disorder of autoimmune aetiology. Experimental therapies with the use of mesenchymal stem cells (MSCs) have emerged as a response to the unmet need for new treatment options. The unique immunomodulatory features of stem cells obtained from Wharton’s jelly (WJ-MSCs) make them an interesting research and therapeutic model. Most WJ-MSCs transplants for multiple sclerosis use intrathecal administration. We studied the effect of cerebrospinal fluid (CSF) obtained from MS patients on the secretory activity of WJ-MSCs and broaden this observation with WJ-MSCs interactions with human oligodendroglia cell line (OLs). Analysis of the WJ-MSCs secretory activity with use of Bio-Plex Pro™ Human Cytokine confirmed significant and diverse immunomodulatory potential. Our data reveal rich WJ-MSCs secretome with markedly increased levels of IL-6, IL-8, IP-10 and MCP-1 synthesis and a favourable profile of growth factors. The addition of MS CSF to the WJ-MSCs culture caused depletion of most proteins measured, only IL-12, RANTES and GM-CSF levels were increased. Most cytokines and chemokines decreased their concentrations in WJ-MSCs co-cultured with OLs, only eotaxin and RANTES levels were slightly increased. These results emphasize the spectrum of the immunomodulatory properties of WJ-MSCs and show how those effects can be modulated depending on the transplantation milieu. 相似文献
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A. Wawrzynek A. J. Nowak M. Bartoszek R. Delpak J. K. C. Shih C. W. Hu 《NDT & E International》2003,36(2):101-110
Inverse analyses (IA) is used to model heat-flow characteristics in a continuum composed of two media. The process solves iteratively an optional number of design parameters. The solution also includes, (a) simulation of equipment and operator error due to data capture, and (b) sensitivity analysis of thermo-mechanical parameters.The analysis models test sample, which is sandwiched between a heating element and a reference material (of known thermal conductivity). This model is then validated by analysing actual thermographs recorded at the steady-state condition, the mean variation of which is subsequently used for IA.IA can then be applied in order to determine the best estimate of the thermo-mechanical properties of the sample in a particular controlled state of integrity or damage. 相似文献
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Susan Joseph Maria Rutkowska Mariola Jastrzêbska Helena Janik Jozef T. Haponiuk Sabu Thomas 《应用聚合物科学杂志》2003,89(4):1007-1016
Blends of polystyrene and polybutadiene were prepared by melt mixing. The melt rheology behavior of the blends was studied with a capillary rheometer. The morphology of the blends was examined with scanning electron microscopy. The levels of continuity and cocontinuity were studied by both morphology and dissolution techniques. The region of phase inversion was observed at 50 wt % polystyrene. Various theoretical models were applied to determine the region of cophase continuity and to locate the point of phase inversion. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 1007–1016, 2003 相似文献
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Fischer R Fotin-Mleczek M Hufnagel H Brock R 《Chembiochem : a European journal of chemical biology》2005,6(12):2126-2142
Cell-penetrating peptides (CPPs) have become widely used vectors for the cellular import of molecules in basic and applied biomedical research. Despite the broad acceptance of these molecules as molecular carriers, the details of the mode of cellular internalization and membrane permeation remain elusive. Within the last two years endocytosis has been demonstrated to be a route of uptake shared by several CPPs. These findings had a significant impact on CPP research. State-of-the-art cell biology is now required to advance the understanding of the intracellular fate of the CPP and cargo molecules. Owing to their presumed ability to cross lipid bilayers, CPPs also represent highly interesting objects of biophysical research. Numerous studies have investigated structure-activity relationships of CPPs with respect to their ability to bind to a lipid bilayer or to cross this barrier. Endocytosis route only relocates the membrane permeation from the cell surface to endocytic compartments. Therefore, biophysical experiments are key to a mechanistic molecular understanding of the cellular uptake of CPPs. However, biophysical investigations have to consider the molecular environment encountered by a peptide inside and outside a cell. In this contribution we will review biophysical and cell-biology data obtained for several prominent CPPs. Furthermore, we will summarize recent findings on the cell-penetrating characteristics of antimicrobial peptides and the antimicrobial properties of CPPs. Peptides of both groups have overlapping characteristics. Therefore, both fields may greatly benefit from each other. The review will conclude with a perspective of how biophysics and cell biology may synergize even more efficiently in the future. 相似文献
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Mariola Puszyńska-Tuszkanow Marek Daszkiewicz Gabriela Maciejewska Maria Cieslak-Golonka 《Inorganic chemistry communications》2009,12(6):484-486
A novel Cu(II) coordination polymer, [Cu(ox)(DMSO)2]n (1) (ox-oxalate dianion, DMSO-dimethyl sulphoxide) has been prepared in the reaction of copper nitrate dihydrate and allantoin (5-ureidohydantoin) in DMSO/water solution. Compound (1) crystallizes in the monoclinic, space group P121/c1 with a = 5.1785(7), b = 13.6311(18), c = 8.5386(12) Å, β = 107.524(12)°, V = 574,76(14) Å3, Z = 4, Dcal = 1779 mg/m3, R1 = 0.0449. The metal ion coordinates through four oxygen atoms belonging to two bidentate bridging oxalate ligands, and two oxygen atoms from two DMSO ligands forming an elongated octahedron. The crystal structure was confirmed by FT-IR and Uv–vis spectroscopic data. 相似文献