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  • 1
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The (MoVO)3+ -containing [Fe4S4]2+ agglomerate {(Ph4P)2[Fe4S4(tmbdt)2 (MoVO)0,76]}n (tmbdt = 2,4,6-trimethylbenzene-1,3-dithiolato) was synthesized by reaction of {(Ph4P)2[Fe4S4(tmbdt)2]}n and MoVOCl3(thf)2. The (MoVO)3+ cation is coordinated to the sulfur ligands binding the [Fe4S4]2+ core. The (MoVO)3+ -containing [Fe4S4]2+ agglomerate exhibits catalytic activity for the reduction of azobenzene and phenylacetylene to hydrazobenzene and phenylethylene, respectively, by Et4NBH4 in N,N-dimethylformamide/alcohol.
    Additional Material: 2 Tab.
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  • 2
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 137-142 
    ISSN: 0887-624X
    Keywords: supramolecular architecture ; cascade molecule ; photochemistry ; phenylazido ; ultraviolet irradiation ; wettability ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A novel supramolecularly assembled surface architectural method was developed, which involved a self-assembling process of amphiphilic molecules and a subsequent photochemical process. The specially designed molecules were cascade “tree” molecules composed of a phenylazido group as root, an aliphatic hydrocarbon chain as stem, and two or three tris(hydroxymethyl)aminomethane groups as leaves. Using a horizontal lifting method, unimolecular assemblies which formed at an air/water interface were transferred to polyethylene (PE) surfaces. Upon ultraviolet irradiation, these molecules were covalently fixed on the surfaces due to the photochemical reactivity of the phenylazido group. Treated surfaces became wettable with water, indicating that hydrophilic hemispheres were located at the outer surface region of the PE surfaces. Bimolecular assemblies composed of cascade molecules and noncascade molecules with a hydroxyl group at a terminus exhibited lower advancing and receding contact angles and reduced hysteresis than those of unimolecular ones, indicating that these bimolecular assemblies have a well-structured molecular organization with a high degree of packing. © 1997 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 29 (1995), S. 1047-1052 
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: A photoreactive octapeptide (Gly-Gly-Gly-Arg-Gly-Asp-Ser-Pro), into which the cell adhesive tripeptidyl sequence Arg-Gly-Asp (RGD) was incorporated, was derivatized with 4-azidobenzoyloxysuccinimide at its N-terminal. Photochemical surface immobilization of the RGD peptide on poly (vinyl alcohol) (PVA) was performed by adsorption and subsequent ultraviolet (UV) irradiation and was evidenced by electron spectra for chemical analysis (ESCA) measurements. Bovine endothelial cells (ECs) adhered and spread well on the RGD peptide-derivatized surfaces in a biologically specific manner. The use of a photomask during UV irradiation enabled preparation of a two-dimensional tissue with micron-order precision. Thus surface immobilization of a photoreactive, cell-adhesive peptide easily can create a cell attachment surface at a desired portion or region of a polymer surface or device. © 1995 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 29 (1995), S. 749-756 
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: This article reports the development of micropatterning technology fo cultured cells by precise surface regional modification via photochemical fixation of phenyl azidoderivatized polymers on polymer surfaces. Photoreactive polymers prepared in this study included poly(N,N, -dimethylacrylamide-co-3-azidostyrene), bis-4-azidobenzamide-polyethylene glycol, and poly(styre-co-3-azido-styrene). The photochemical fixation of these photoreactive polymers consisted of three steps: (1) coating of a photoreactive polymer on a material surface, (2) ultraviolet irradiation through a photomask, and (3) removal of nonreacted polymer by a solvent. Electron spectroscopy for chemical analysis and water contact angle measurement were employed for surface characterization. Two different types of regionally modified surfaces were prepared; one was a hydrophilic polymer regionally fixed on a tissue culture dish and the other was a hydrophobic polymer regionally fixed on poly(vinyl alcohol) (PVA). Photochemical surface microfabrication permits μ-order dimensional precision, which was verified by the micropatterned tissue formation of bovine aorta endothelial cells (ECs) when ECs were seeded on these surfaces. ECs adhered, spread, and confluently proliferated only on uncoated tissue culture dish surfaces or hydrophobic regions on PVA. Thus, the regionally differentiated cell adhesional regions were created by photo chemically driven surface microprocessing. © 1995 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 32 (1996), S. 157-164 
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Phenylazido-derivatized low-molecular-weight substances and copolymers containing hydrocarbon- or fluorocarbon-alkyl group, sulfonato or amino group, and hydroxyl group were prepared. Upon coating and subsequent ultraviolet (UV) light irradiation, convalent fixation of these substances or copolymers took place only at irradiated portions of polymer surfaces, providing a hydrophobic, ionic, or hydrophilic nature. These were verified with electron spectroscopy for chemical analysis (ESCA) spectra and water contact-angle measurement. Endothelial cells adhered on photochemically modified surfaces which have alkyl, sulfonato, or amino groups on their surfaces, whereas little adhesion occurred on a hydroxyl group-bearing hydrogellike surface. When UV light was irradiated through a photomask on the polymer surfaces, patterned and microprocessed surfaces having cell-adhering and nonadhering regions were obtained. The potential application of this photochemical surface processing method in biomedical engineering is discussed. © 1996 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 32 (1996), S. 165-173 
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Using surface-photochemistry - driven microprocessing, striped patterns of cell-adhesive and nonadhesive domains were prepared on tissue-culture dishes. The width of striped patterns ranged from 20 to 130 μm. When endothelial cells were cultured on such dimensionally well-defined surfaces, cells adhered, migrated, and proliferated only on cell-adhesive domains. Migration potentials such as tracks of moving cells and migration rates were determined using a time-lapse video recording apparatus under a phase-contrast microscope and a computer-assisted image analyzer. The migration track in the direction of the width of the stripe-pattern was limited to the size of the width, and effective migratory distance over 400 min of observation was considerably reduced, to almost half that for a nontreated surface, whereas migratory rate was not changed by surface processing, irrespective of the stripe-pattern width. After a 2-day culture, oriented patterned cellular sheets were obtained. Cells were elongated and aligned along the axis of the striped pattern. The degrees of orientation and elongation were enhanced with a decrease of the line width. At the narrowest surface domain, cells only migrated back and forth, and eventually they became highly elongated and oriented along the axis of the domain. These results indicated that the adhesion area, migrating direction, and orientation of cells can be controlled by this method with micron-order precision. This method provides quantitative information on the kinetics of the migration process and the morphogenesis of the microprocessed surface. © 1996 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
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