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  • Biochemistry and Biotechnology  (2)
  • Iodonium salt  (2)
  • Photochromic reaction  (1)
  • Pyridiniobenzamidate  (1)
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Materialart
Erscheinungszeitraum
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Asymmetric inclusion by de novo designed proteins: Fluorescence probe studies on amphiphilic α-helix bundles (1991)
    New York, NY : Wiley-Blackwell
    Proteins: Structure, Function, and Genetics 11 (1991), S. 133-141 
    Details
    ISSN: 0887-3585
    Schlagwort(e): fluorescence depolarization ; coiled-coil ; induced circular dichroism ; exciton chirality ; ANS ; acridine orange ; Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin
    Notizen: The inclusion feature and supersecondary structure of the de novo designed proteins which are constructed with several amphiphilic α-helices and flexible linkage parts were investigated with fluorescence probes. Five types of small proteins (or peptides) have been designed, which are composed of 2, 3, 4, 4, and 6 helices, respectively, and are linked with only linear junctions except for one of 4-helix proteins. All of these proteins have inclusion ability for hydrophobic fluorophores. Further, by the analysis of fluorescence polarization anisotropy, it was suggested that these proteins include guest molecules in compact helix bundles constructed with about 4 helices. Asymmetric inclusion of both monomer and stacked dimer of acridine orange derivatives was found by means of induced circular dichroism except for the 4-helix protein with cross-junction. The chirality of the included dimer proved to be in accordance with the chiral sense of α-helical coiled-coil. The 6-helix protein has especially high efficiency in inclusion for any fluorophores examined in this study and brings about a significant blue-shift of maximal emission for 8-anilino-1-naphthalenesulfonate.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prot.340110206
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  • 2
    Digitale Medien
    Digitale Medien
    Diffusivity of oxygen into carriers entrapping whole cells (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 34 (1989), S. 55-58 
    Details
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: The effective diffusivity of oxygen, De, in Ca-alginate and PVA-SbQ gels was measured using a two-chamber vessel with a membrane between the two chambers. The effect of cell density, Cc, on De in Ca-alginate gels was studied. The effective diffusivity of oxygen decreased with increasing cell density, to Cc = 170 kg dry cells/m3 gel. The dependency of De on cell density was discussed in terms of a random-pore model. The model correlated well with experimental data, i.e., kDe/D0 = 0.86(1 - 1.47 × 10-3 Cc)2. Here, k is the partition coefficient, and D0 is diffusivity in water.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260340107
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  • 3
    Digitale Medien
    Digitale Medien
    Reversible alignment change of nematic liquid crystals by photochromic polymer films (1990)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 1 (1990), S. 311-318 
    Details
    ISSN: 1042-7147
    Schlagwort(e): Liquid crystal (LC) ; Photoresponsive polymer ; Photochromic reaction ; Molecular alignment ; Photorecording ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: The alignment of a nematic liquid crystal (LC) was changed reversibly by a photochromic reaction of vinyl-polymer films bearing azobenzene (Az) chromophores. Photoisomerization of Az in the polymer films proceeded slower than in solution systems with an irreversible nature, due to a limited free volume of polymers and the presence of Az aggregates. Photoregulative Az films were obtained by two procedures: (i) spin-coating followed by baking processes: and (ii) adsorption from a LC/polymer mixture onto a lecithin-coated glass surface. Perpendicular alignment, which is achieved both in the surface Az and in the LC layer, allows a parallel interaction between them and enables the photoregulation of the LC alignment.
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pat.1990.220010505
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  • 4
    Digitale Medien
    Digitale Medien
    Positive working photoresists sensitive to visible light, II: poly{2-arylpropyl-2 and bis(p-methoxyphenyl)methyl methacrylates} (1992)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 3 (1992), S. 61-65 
    Details
    ISSN: 1042-7147
    Schlagwort(e): Iodonium salt ; Photogenerated acid ; Photoresist ; Poly(methacrylates) ; Diffraction efficiency ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Acid-labile polymers of methacrylates of 2-(p-substituted phenyl)propanol-2 and bis(p-methoxyphenyl)methanol were evaluated as visible light sensitive positive-type resists. The chemistry to form images is based on the cleavage of esters catalysed by an acid generated by photodecomposition of diphenyliodonium hexafluorophosphate sensitized by 2-benzoyl-3-(p-dimethylaminophenyl)-2-propenenitrile. A copolymer of bis(p-methoxyphenyl)methyl methacrylate-phenyl methacrylate exhibited a high photospeed upon exposure to 488 nm light when coupled with the iodonium salt and the dye, and was applicable to relief holography.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pat.1992.220030203
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  • 5
    Digitale Medien
    Digitale Medien
    Photosensitive poly(vinyl alcohol) bearing N-(1-pyridinio)benzamidate groups (1993)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 4 (1993), S. 514-518 
    Details
    ISSN: 1042-7147
    Schlagwort(e): Poly(vinyl alcohol) ; Pyridinium ylide ; Pyridiniobenzamidate ; Negative photoresist ; Photosensitive ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Poly(vinyl alcohol) (PVA) bearing N-(1-pyridinio)benzamidate (PB) was synthesized through acetalization of PVA and 4-dimethoxymethyl-N-(1-pyridinio)benzamidate (DMPB) in water. The PB groups in PVA-PB had almost the same proportion of DMPB to the starting PVA. The UV spectrum of PVA-PB shows an absorption band of pyridinium ylide as a shoulder around 300 nm in water, and as a maximum at 315 nm in a film on a quartz plate. These absorption bands decreased on irradiation at 313 nm. The photoreaction of the PVA-PB film proceeds much faster than that of PVA-PB in water. The solution, of PVA-bearing high-PB content, became slightly turbid during irradiation. After irradiation the film became insoluble in water, and the soluble fraction of polymer (P̄ = 1700) was 3% at a PB content of 1 mol% and less than 1% at that of more than 2 mol%. This polymer can be applied as a water-soluble negative photoresist.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pat.1993.220040806
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  • 6
    Digitale Medien
    Digitale Medien
    Positive working resists sensitive to visible light, I: poly(tert-butyl and 2-phenylpropyl-2 methacrylates) sensitized with diphenyliodonium salt  -  p-aminobenzylidene dye system (1992)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 3 (1992), S. 9-16 
    Details
    ISSN: 1042-7147
    Schlagwort(e): Iodonium salt ; Sensitized photolysis ; Photogenerated acid ; Poly(methacrylates) ; Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Visible-light-sensitive positive type resists have been developed. The chemistry to form images is based on the cleavage of side chain ester bonds of poly(methacrylates) catalyzed by an acid which is generated on sensitized photodecomposition of a diphenyliodonium (DPI) salt. Homopolymers and copolymers of tert-butyl methacrylate (BMA) and 2-phenylpropyl-2 methacrylate (PPMA) were used as acid labile polymers. Exposure of thin films of the poly(methacrylates) containing DPI salt and p-dimethylaminobenzylidene derivatives to an Ar laser beam emitting 488 nm light and subsequent heat treatment resulted in solubility alteration of the polymers, which became soluble in a protic solvent system. Considerable reduction of film thickness was observed after heating an image-wise exposed thin film of PPMA polymers. The minimum exposure energies of 488 nm light for the positive image formation were 60 mJ/cm2 and 40 mJ/cm2 for BMA and PPMA homopolymers, respectively.
    Zusätzliches Material: 12 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pat.1992.220030102
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