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 3
Displaying 1-11 of 11 articles from this issue
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Greeting
Report on the 5th Student Meeting
Preprint of The 65th Annual Meeting
Original Paper
  • Performance of Multiple-effect Diffusion Still for Seawater Concentration
    － A Tilted Still Heated at Less than 100 ℃ from the Bottom in Vacuum Container －
    Hisashi MINAKUCHI, Satoru GIMA, Takehiro NOSOKO
    2014 Volume 68 Issue 3 Pages 180-187
    Published: 2014
    Released on J-STAGE: September 14, 2015
    DOIhttps://doi.org/10.11457/swsj.68.180
    JOURNAL FREE ACCESS
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    A multiple-effect diffusion still in a vacuum container was theoretically analyzed with a one-dimensional steady-state model. The still was heated at Tbtm＝100 ℃ or less from the bottom and the container was evacuated at the saturated water vapor pressure corresponding to Tbtm. The findings are summarized as: (1) The still without the container shows that the coefficient of performance, COP, increases as Tbtm decreases and has a gentle peak at Tbtm ≈ 50 ℃, while the decrease in Tbtm causes a serious decrease in the total evaporation rate, Uv. (2) The still in the vacuum shows that the Uv is much larger, and the COP is higher than when it is without the container. (3) The temperature drop from the top of the still to the ambient air is 15～22 ％ of the total in the vacuum, while it is 2～12 ％ otherwise. (4) A decrease in Tbtm accompanies a decrease in the heat consumed in heating up seawater fed to the still, and the evacuation increases both the heat input to the bottom and the ratios of evaporation heat to total heat through a diffusion layer. These result in the high performance of the still in the vacuum container.
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  • Kinetics of Hydrolysis Reaction of Chitin Using Chitinase Purified from Marine Bacterium Alteromonas marina
    Kazuo Kondo, Yasuo Oike, Michiaki Matsumoto
    2014 Volume 68 Issue 3 Pages 188-195
    Published: 2014
    Released on J-STAGE: September 14, 2015
    DOIhttps://doi.org/10.11457/swsj.68.188
    JOURNAL FREE ACCESS
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    Chitinase with a molecular weight of 45 kDa was purified from a marine bacterium, Alteromonas marina. It was obtained after cation exchange chromatographic isolation of crude enzymes from a culture solution where A.marina was incubated for 4 days using colloidal chitin as a carbon source. The two chitinases obtained were named Chi-A and Chi-B. Chi-A and Chi-B were purified to 6.73-fold, 1.32-fold from the crude enzyme, respectively. The optimum pH of Chi-A was found to be 7.0, and the enzyme was stable in the pH range of 4.0～9.0. The optimum temperature of Chi-A was 45 ℃, and the enzyme was stable till 45 ℃, but beyond this temperature the enzyme was deactivated. The enzyme hydrolyzed (GlcNAc)5 to (GlcNAc)3 and (GlcNAc)2, (GlcNAc)4 to two molecules of (GlcNAc)2 and to (GlcNAc)3 and (GlcNAc)1, and (GlcNAc)3 to (GlcNAc)2 and (GlcNAc)1. (GlcNAc)2 was not hydrolyzed by Chi-A. The reaction rate constants were calculated according to the reaction mechanism just mentioned above. As a result, the reaction rate constant k5 for (GlcNAc)5 hydrolysis was found to be larger than k4 for (GlcNAc)4 and k3 for (GlcNAc)3.
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  • Impregnation of Hydrous Titanium Oxide onto Cation-Exchange Polymer Chain Grafted onto Nylon Fiber
    Yuki NAKATANI, Satoshi UMINO, Mai SUGIYAMA, Kunio FUJIWARA, Takanobu S ...
    2014 Volume 68 Issue 3 Pages 196-201
    Published: 2014
    Released on J-STAGE: September 14, 2015
    DOIhttps://doi.org/10.11457/swsj.68.196
    JOURNAL FREE ACCESS
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    Hydrous titanium oxide was impregnated onto a 6-nylon fiber by immersing titanium-ion-bound cation-exchange fiber into sodium hydroxide solution with various concentrations ranging from 0.1 to 1.0 M. First, Ti (OH)22＋ as an ionic species of titanium was bound to a sulfonic acid group of the poly-sodium styrene sulfonate (SSS) grafted onto the nylon-fiber by means of radiation-induced graft polymerization. The maximum amount of titanium ions bound throughout the entire SSS-grafted fiber was 1.3 mmol/g. By precipitation of Ti (OH)22＋ eluted by sodium ions of NaOH solution with hydroxide ions, hydrous titanium oxide was formed in the periphery of the fiber. Bound Ti (OH)22＋ was quantitatively converted into the precipitate of hydrous titanium oxide while a negligible leakage of titanium was detected in the NaOH solution. The impregnation percentage of the resultant fiber defined by the content of hydrous titanium oxide in the product fiber was 14 ％.
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Relay Essay (7)
Introduction of Research Committees
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