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Volume 60, Issue 1
Displaying 1-8 of 8 articles from this issue
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Oleg V. MIKHAILOV1997 Volume 60 Issue 1 Pages 2-4
Published: February 25, 1997
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSThe formatton process of non-silver tmages conststing of Cu (II) chelates with 8-mercapto-5-methylthioguinoline has been studied. The unusual course of D ∇= f (DAg) curves (D∇ is a density of non-stiver imaimage obtained from an original silver image having DAg density) where D ∇values were decreased with DAg growth at some 8-mercapto-5-methyl-thioquinoline concentrations in the tolution and DAg ranges, has been observed.View full abstractDownload PDF (358K) -
Hirotaka YAMAMOTO1997 Volume 60 Issue 1 Pages 5-11
Published: February 25, 1997
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSFerric chelate of EDTA has been used as a photographic bleaching agent for the past five decades. In spite of its long history, EDTA is not biodegradable, therefore, new chelates which are environmentally safe are demanded. Three essential factors are required for such post-EDTA compounds: chelating ability equal to that of EDTA, practical biodegradability in environment and reasonable production costs.
In this review, we will explain several aspects of our approach to the new post-EDTA chelates with respect to detergent components (builder), where biodegradability is a more critical factor than in the field of photographic chemicals.View full abstractDownload PDF (973K) -
Kumiko KUWABA, Tetsuya EBIHARA, Iori SOMEKI, Shinkichi IRIE1997 Volume 60 Issue 1 Pages 13-16
Published: February 25, 1997
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSOn sodium dodecyl sulphate-polyacrylamide gel electrophoresis, some collagen-derived chains in lime-processed gelatin were detected, however, their electrophoretic mobilities were lower than those of the corresponding chains in enzyme-treated collagen.
Ferguson plot analysis indicated that the collagen-derived chains in lime-processed gelatin had the equal molecular weight and lower capacity for combining with sodium dodecyl sulphate as compared with the corresponding chains in enzyme-treated collagen, which resulted in the lower electrophoretic mobilities.View full abstractDownload PDF (1968K) -
Masato KOJIMA, Shohei AOYAGI1997 Volume 60 Issue 1 Pages 17-18
Published: February 25, 1997
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSA convenient procedure for lyophilizing relatively large amount of concentrated gelatin solutions in vials is presented. The main feature is to set the sample and to slice or beat it to small fragments so that the drying is enhanced by the increased surface area.View full abstractDownload PDF (1700K) -
Shinya TAKAHASHI, Keiji SUZUKI, Kiyoshi TAKEMOTO, Noriichi ITOH, Yusuk ...1997 Volume 60 Issue 1 Pages 19-27
Published: February 25, 1997
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSThe change of impurities in and physical retardance of gelatin by ultrafiltration (UF) treatment at various pH was studied. Contents of cations decreased at the low pH condition. Reducing sugar contents decreased at high pH condition. It may be derived from the difference of the pH dependence of adsorption to gelatin. The physical retardance at pH 4 decreased with the high pH UF treatment, being relative to the change of reducing sugar content. On the other hand, the physical retardance at pH 8 decreased with the low pH UF treatment. It may be caused by the change of the calcium contents.
The change of physical retardance of the lime and acid treated deionized gelatins, the fourth series IAG gelatins, fractionated by UF treatment was investigated. The high molecular weight fraction (fH) showed lower restraining at pH 4 ripening, and the low molecular weight fraction (fM) showed higher one than the original gelatin. On the other hand, the fH showed higher one and the fL showed lower one than the original gelatin at pH 8 ripening. It was considered that the change of the restraining properties of the fractionated gelatins results from the dependence of adsorption to the silver chloride crystals on molecular weight at low pH ripening. The change of physical retardance at high pH was caused by the contamination of the metal ions with UF treatment.View full abstractDownload PDF (1016K) -
Naotsugu MURO, Tadaaki TANI1997 Volume 60 Issue 1 Pages 28-32
Published: February 25, 1997
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSPhotographic sensitivity and photoconductivity of unsensitized and reduction-sensitized AgBr grains in emulsion layers which were kept in dry Ar gas revealed the formation of R-centers by electron transfer from gelatin to the emulsion grains. In additon, P-centers and fog centers were formed on keeping of emulsion layers with variation of chemical sensitization in wet O2 gas. A stabilizer TAI depressed the change in sensitivity and fog formation of emulsion layers on keeping.View full abstractDownload PDF (542K) -
Takashi OHNO, Yusuke OKAWA, Hiroyuki KOBAYASHI, Hiroyuki MATSUDA, Ryoj ...1997 Volume 60 Issue 1 Pages 33-36
Published: February 25, 1997
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSWe used a high pressure slurry jet pump unit in order to change the molecular weight distribution of gelatin. The high pressure sample gelatin solution compressed by a pump equipment at 50 MPa or 150 MPa was discharged from a nozzle. The molecular weight distribution of the discharged sample solution was determined with a gel permeation chromatography. It was proved that this method was effective in changing the molecular weight distribution of gelatin.View full abstractDownload PDF (404K) -
Katsuya TERAOKA, Mituhiro NAKAMURA, Kaoru HOSHINO, Kimio NIWA, Naomi S ...1997 Volume 60 Issue 1 Pages 37-44
Published: February 25, 1997
Released on J-STAGE: August 11, 2011
JOURNAL FREE ACCESSA light pulse and an electric field pulse were synchronously applied to a layer of a chemically unsensitized AgBr emulsion, and photographic sensitivity of the emulsion layer was measured in terms of quantum sensitivity (i.e., number of absorbed photons/grain, which rendered 50% of existing grains developable). Significant increase in sensitivity was particularly observed when the electric field exceeded 1 MV/cm. The quantum sensitivity of the emulsion, which was measured as 440 absorbed photons/grain in the absence of the electric field pulse, reached in the presence of the electric field pulse the sensitivity of 13 absorbed photons/grain, which was comparable to the sensitivity of a sulfur-plus-goldsensitized emulsion.View full abstractDownload PDF (3824K)
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