Bulletin of the Society of Sea Water Science, Japan
Online ISSN : 2185-9213
Print ISSN : 0369-4550
ISSN-L : 0369-4550
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Volume 68, Issue 4
Displaying 1-14 of 14 articles from this issue
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The 65th Annual Meeting
Preface
Special Issue : “Analysis and Separation Technology for Acquisition of High Quality Resources from Sea Water”
Introduction
Commentary
Review
  • Removal of Bisphenol A and Its Derivatives with Oxidoreductases
    Ayumi TAKAHASHI, Yuji KIMURA, Kazunori YAMADA
    2014 Volume 68 Issue 4 Pages 242-250
    Published: 2014
    Released on J-STAGE: September 14, 2015
    DOIhttps://doi.org/10.11457/swsj.68.242
    JOURNAL FREE ACCESS
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    Recently, enzymatic treatment has attracted much interest in the detoxication and/or transformation of suspected endocrine disrupting chemicals as an alternative strategy to conventional chemical, physical, and biological treatments that pose serious limitations. Therefore, this review summarizes our research efforts spent to remove BPA and its derivatives from an aqueous medium with oxidoreductases, such as horseradish and soybean peroxidases (HRP and SBP), mushroom tyrosinase, and Trametes versilolor laccase. HRP and SBP catalyzed the formation of phenoxy radicals from BPA and its derivatives in the presence of hydrogen peroxide (H2O2), and subsequently water-insoluble oligomers were generated. On the other hand, laccase catalyzed the formation of phenoxy radicals from BPA without H2O2. In these systems, when the enzymatic treatment was initiated in the presence of polyethylene glycol (PEG), the dose of enzymes was considerably less. In addition, when the pH value of the solutions was decreased to 3-4 after the enzymatic treatment, filtration of oligomers was facilitated by aggregation, probably due to hydrogen bonding between phenolic OH groups. BPA also underwent tyrosinase-catalyzed quinone oxidation and this enzymatic reaction was accelerated by the addition of H2O2. In addition, BPA was removed from the aqueous medium through nonenzymatic quinone adsorption on chitosan beads. This procedure was applied to the removal of other derivatives. The data and results reviewed here indicate that the enzymatic treatments we constructed are a promising procedure for removal of BPA and its derivatives.
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Original Paper
  • Study on Mechanism in Crystal Growth with Adhesion Phenomena of Suspended Fine Crystals in Mother Liquid
    Koji MASAOKA, Ryuta MISUMI, Kazuhiko NISHI, Meguru KAMINOYAMA
    2014 Volume 68 Issue 4 Pages 251-257
    Published: 2014
    Released on J-STAGE: September 14, 2015
    DOIhttps://doi.org/10.11457/swsj.68.251
    JOURNAL FREE ACCESS
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    We investigated effects of the particle size of fine crystals on the apparent crystal growth rate by adhesion phenomena of fine crystals suspended in mother solution on a seed crystal surface. The mother solution was sampled from a crystallizer operated under conditions of supersaturation ΔT＝1－5 K and amount of suspended fine crystals Nfine＝0.2－7×105 number/kg-solution. And the particle size distribution of fine crystals on the filter after filtration of mother solution was measured by image analysis using a microscope. As the result, the median diameter and distribution constant of Rosin- Rammler distribution, were 3-6 μm and 1.1-2.3, respectively. Median diameter of fine crystals increased with supersaturation degree of mother solution. Crystal growth rate and nucleation rate of fine crystals were thought that they are low. We presupposed three effects of fine crystals on the apparent crystal growth of a seed crystal adhered. 　Effect 1; Increase of crystal growth unit 　Effect 2; Making starting point of crystal growth accelrated 　Effect 3; Decrease of supersaturation by nucreation and growth of fine crystal　 We estimated the rate of Effect 1 and 3 on the apparent crystal growth rate by apply of measured particle size of fine crystals to an apparent crystal growth rate equation of a previous paper. As the result, the distribution ratio of Effect 1 and 3 were low. A temporary enhancement of crystal growth with steps formed by adhesion of a fine crystal was estimated from a previous report and it was an appropriate value compared with Effect 2. We, therefore, concluded that the main factor of enhancement of the apparent crystal growth rate by adhesion of fine crystals is Effect 2.
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  • Repeated Deposition of Titanium Compounds onto 6-Nylon Fiber for Removal of Strontium from Seawater
    Michitaka KONO, Satoshi UMINO, Kunio FUJIWARA, Takanobu SUGO, Takashi ...
    2014 Volume 68 Issue 4 Pages 258-263
    Published: 2014
    Released on J-STAGE: September 14, 2015
    DOIhttps://doi.org/10.11457/swsj.68.258
    JOURNAL FREE ACCESS
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    Titanium hydroxide (TiO2・xH2O) was impregnated by repeated reaction of titanium ionic species-bound cation-exchange fiber with sodium hydroxide (NaOH) solution. The amount of titanium hydroxide deposited increased with an increase in the repeated number of deposition. The TiO2・xH2O-impregnated fiber was treated with NaOH in a mixture of methanol and H2O to convert titanium hydroxide into sodium titanate (NaxTiyOz). After the ninth repetition, an the impregnation percentage calculated from the mass ratio of sodium titanate to the cation-exchange fiber amounted to 110 ％. The amount of strontium adsorbed onto the fiber prepared by the ninth repetition rose to 0.86 mg-Sr per g of the fiber, which was almost equivalent to that of a commercially available strontium adsorbent. The selectivity of Sr over Mg increased with the repetition number of titanium hydroxide deposited onto the fiber, whereas that of Sr over Ca remained constant irrespective of it.
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Short Paper
  • Halo-tolerant Lactic Acid Bacteria from Traditional Salted Pickle Yamagawaduke in Kagoshima
    Keita OYAMA, Aya HAYASHI, Takekazu KOBAYASHI, Masao TOKUNAGA, Matsujir ...
    2014 Volume 68 Issue 4 Pages 264-265
    Published: 2014
    Released on J-STAGE: September 14, 2015
    DOIhttps://doi.org/10.11457/swsj.68.264
    JOURNAL FREE ACCESS
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    Yamagawaduke is a traditional salted white radish pickle developed 500 years ago in southern Kagoshima area. It is a pickle that does not use rice bran in the warm area of Kagoshima: naturally dried white radish that is tightly packed in an earthen pot with salt, and fermented for more than half a year. We here isolated several strains of lactic acid bacteria from this traditional food, and four strains were determined as Lactobacillus spp. and Weissella sp. by using 16S rRNA gene analysis. The Y8 strain showed half the growth of those in YGP medium with addition of NaCl concentrations at 5.9 ％ to the medium.
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Relay Essay (8)
Letter from Research Committees
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