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  • 1
    Electronic Resource
    Electronic Resource
    Binding of Cu (II), Tb (III) and Fe (III) to chicken ovotransferrin (1990)
    Springer
    European biophysics journal 18 (1990), S. 1-8 
    Details
    ISSN: 1432-1017
    Keywords: Transferrin ; Metal-binding protein
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract The kinetics of binding of Cu (II), Tb (III) and Fe(III) to ovotransferrin have been investigated using the stopped-flow technique. Rate constants for the second-order reaction, k +, were determined by monitoring the absorbance change upon formation of the metal-transferrin complex in time range of milliseconds to seconds. The N and C sites appeared to bind a particular metal ion with the same rate; thus, average formation rate constants k + (average) were 2.4 × 104 M−1 s−1 and 8.3 × 104 M−1 S −1 for Cu (II) and Tb (III) respectively. Site preference (N site for Cu (II) and C site for Tb (III)) is then mainly due to the difference in dissociation rate constant for the metals. Fe (III) binding from Fe-nitrilotriacetate complex to apo-ovotransferrin was found to be more rapid, giving an average formation rate constant k + (average) of 5 × 105 M−1 s−1, which was followed by a slow increase in absorbance at 465 nm. This slow process has an apparent rate constant in the range 3 s−1 to 0.5 s−1, depending upon the degree of Fe (III) saturation. The variation in the rate of the second phase is thought to reflect the difference in the rate of a conformational change for monoferric and diferric ovotransferrins. Monoferric ovotransferrin changes its conformation more rapidly (3.4s−1) than diferric ovotransferrin (0.52 s−1). A further absorbance decrease was observed over a period of several minutes; this could be assigned to release of NTA from the complex, as suggested by Honda et al. (1980).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00185414
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of tumor recurrence following anterior skull base surgery (1998)
    Springer
    European archives of oto-rhino-laryngology and head & neck 255 (1998), S. 155-162 
    Details
    ISSN: 1434-4726
    Keywords: Key words Skull base surgery ; Neoplasms ; Tumor ; recurrence ; Anterior cranial fossa ; Salvage surgery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In order to elucidate the predictive factors for tumor recurrence following skull base surgery and the significance of salvage surgery in cases of recurrence, we retrospectively surveyed the incidence, site, and time of local recurrences in 20 patients who underwent either anterior or anterolateral skull base surgery for malignant tumors invading the anterior cranial fossa between 1989 and 1995 at the University of Tokyo Hospital. Nineteen patients underwent total resections of malignancies, with recurrences and/or metastases occurring in 13. Local recurrences occurred at the skull base in 5 patients (group A), outside the skull base in 4 patients (group B), and in both locations in 2 patients (group C). The mean time interval between surgery and recurrence was 29 months in group A, and 4.2 months in groups B and C. The local recurrence-free rates were 51% at 1 year and 34% at 5 years. Both brain and/or dural invasion and a microscopic positive surgical margin were proven to be predictive factors for tumor recurrences. The 3-year local recurrence-free rate was 20% in patients with dural invasions and 83% in those without. The incidence of recurrence-free patients was 79% in cases with negative margins, with no patient being recurrence-free in positive cases. All recurrences found more than 6 months after the initial surgery resulted in patients being salvaged successfully by a second operation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004050050034
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  • 3
    Electronic Resource
    Electronic Resource
    Water-Soluble contrast enhancing materials - new photobleachable dyes (1989)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 29 (1989), S. 898-901 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Many styrylpyridinium compounds (SPC), which are very stable in the dark, were prepared and evaluated as photobleachable dyes for contrast enhanced lithography (CEL). The photobleaching characteristics of water-soluble contrast enhancing materials composed of SPC and water-soluble polymer depend on the structure of the SPC and the kind of polymers used. The technique using SPC-based CEL proved to be very effective for the resist pattern profiles.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760291403
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  • 4
    Electronic Resource
    Electronic Resource
    Photosensitive resins containing p-dimethylaminobenzylidene derivatives and diphenyliodonium salt as photoinitiators (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 34 (1987), S. 2747-2756 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A series of p-dimethylaminobenzylidene derivatives was able to sensitize the photodecomposition of diphenyliodonium salt to afford highly photosensitive negative-type resins. When a polymer-bearing methacryloylated group in the side chain was sensitized with a combination of the p-dimethylaminobenzylidene compounds and the iodonium salt, the polymer demonstrated high sensitivity even to 488 nm light emitted from an Argon laser. The same photoinitiator systems were applicable to insolubilize poly(glycidyl methacrylate) through cationic photopolymerization. The storage stability of these types of photoinitiators depends on the structure of the benzylidene compounds; decreasing the basicity of the amino group enhanced the thermal stability.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1987.070340810
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