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Volume 50, Issue 1
Displaying 1-11 of 11 articles from this issue
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1987 Volume 50 Issue 1 Pages 1-2
Published: February 28, 1987
Released on J-STAGE: August 11, 2011
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Tetsuo MURAYAMA1987 Volume 50 Issue 1 Pages 3-13
Published: February 28, 1987
Released on J-STAGE: August 11, 2011
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Shohei AOYAGI, Kimiko HIRAYANAGI, Toshio MATSUMOTO, Toshio ISHIKAWA1987 Volume 50 Issue 1 Pages 14-21
Published: February 28, 1987
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSFor improving the accuracy of molecular weight distribution (MWD) analysis of photographic gelatin, electrophoretic conditions in sodium dodecyl sulfate/polyacrylamide gel system (SDS/PAGE) were investigated in detail.
A good separation was obtained by overlaying a concentrating layer on the separating gel with a gradient of 2.5 to 10% acrylamide.
The result of various pretreatments strongly suggests that dodecyl sulfate ions rapidly bind to gelatin molecules at room temperature and also that the resulted complexes directly reach the most stable conformation without staying at metastable states.
From the data of 33 IAG gelatins, some characteristics of MWD patterns in the gelatin types have been recognized.
The result of silver staining suggests the existence of certain selective interactions between gelatin molecules and silver ions.View full abstractDownload PDF (11142K) -
Toshio TANAKA, Hiroshi SAIJO, Masashi IWASAKI, Kimihisa HAMAZOE, Hisat ...1987 Volume 50 Issue 1 Pages 22-26
Published: February 28, 1987
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSKinetics of J-aggregation by salting out of 1, 1'-diethyl-2, 2'-cyanine chloride (Dye 1) from dilute aqueous solutions have been studied by mixing Dye 1 solutions with concentrated sodium sulfate solutions in a rapid solution mixing device and measuring the optical absorbance of the mixture at J-band maximum as a function of time with a conventional ultraviolet spectrophotometer. The aggregation rate was larger at lower temperatures, suggesting that nucleation was the rate-determining step of J-aggregation. From the concentration-dependence of the rate, the reaction order of nucleation of J-aggregates was calculated to be about 5, using an n-th order rate equation modified to apply to nucleation systems with low supersaturations. The temperature-dependence of residual monomer concentration at the end of the reaction gave a mean enthalpy of 42 kJ/mol for the dissolution of monomers from J-aggregates.View full abstractDownload PDF (616K) -
Kenichiro NAKAMURA, Mineo YAMAUCHI, Nobuyuki FUJITANI, Yohichi HIGUCHI1987 Volume 50 Issue 1 Pages 27-30
Published: February 28, 1987
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSEffects of mixed dyes to azide polymers were investigated by measuring spectral sensitivities and absorption spectra. N-Phenylthioacridone (TA) is an effective sensitizer to azides. However, addition of erythrosine (ES) to azides sensitized already with TA further improves the sensitivity, while ES alone is not effective to sensitize azides.
Spectral analysis for the co-addition effect of the two sensitizers showed that both ES and TA were decomposed by excitation of ES alone through a filter. Decomposition products were analysed by high-performance liquid chromatography. The chromatographic analysis also indicated decomposi-tion of both dyes during the sensitization process.View full abstractDownload PDF (500K) -
Takekimi SHIOZAWA, Masashi IWATSUKI, Yoshiyasu HARADA1987 Volume 50 Issue 1 Pages 31-32
Published: February 28, 1987
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSAn electron microscope Model JEM-2000 SCM equipped with a superconducting magnet lens, developed recently by JEOL, has been applied to the observation of AgBr microcrystal lattice images.
Since the specimens are kept at liquid He temperature in this system, this apparatus facilitates observation of materials sensitive to radiation damage. High-resolution AgBr lattice images taken with this electron microscope are presented.View full abstractDownload PDF (188K) -
Shin OHNO1987 Volume 50 Issue 1 Pages 33-34
Published: February 28, 1987
Released on J-STAGE: August 11, 2011
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Yasuo UCHIDA1987 Volume 50 Issue 1 Pages 35-39
Published: February 28, 1987
Released on J-STAGE: August 11, 2011
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Yoshiro UDAGAWA1987 Volume 50 Issue 1 Pages 40-46
Published: February 28, 1987
Released on J-STAGE: August 11, 2011
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Yuji TAKASHIMA1987 Volume 50 Issue 1 Pages 47-54
Published: February 28, 1987
Released on J-STAGE: August 11, 2011
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Hitoshi URABE1987 Volume 50 Issue 1 Pages 55-60
Published: February 28, 1987
Released on J-STAGE: August 11, 2011
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