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 70, Issue 1
Displaying 1-10 of 10 articles from this issue
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Greeting
Special Issue : “Recent Progress in Treatment Technique of Ballast Water”
Commentary
Review
  • A Review of Treatment and Analysis Technologies for Ballast Water
    Yasutada SUZUKI
    2016 Volume 70 Issue 1 Pages 20-27
    Published: 2016
    Released on J-STAGE: September 27, 2017
    DOIhttps://doi.org/10.11457/swsj.70.1_20
    JOURNAL FREE ACCESS
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    Ballast water is loaded into vessels instead of their cargo in order to stabilize them. Usually it is discharged at a different point from where the water was loaded. Therefore the risk of introduction of non-indigenous organisms can be caused by ballast water. The International Maritime Organization, IMO adopted the International Convention for the Control and Management of Ships’ Ballast Water and Sediments, known as BWM Convention, in 2004 to regulate ballast water discharging. This Convention will be full ratification soon. This review summarizes the techniques to be applied for the treatment and analysis of ballast water.
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Original Paper
  • Effects of Aerosol Particles Transported from the Continent of Asia via Marine Microbial Communities in the Northwest Pacific Ocean
    Yuya ASAHI, Teruya MAKI, Akira ISHIKAWA, Tomoki MATSUNAGA, Koichi WATA ...
    2016 Volume 70 Issue 1 Pages 28-40
    Published: 2016
    Released on J-STAGE: September 27, 2017
    DOIhttps://doi.org/10.11457/swsj.70.1_28
    JOURNAL FREE ACCESS
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    Aerosol depositions provide nutrients, trace metals, and organic compounds for marine environments that enhance ocean productivity and carbon sequestration, and indirectly influence atmospheric carbon dioxide concentrations and climate change. However, most of the microbial dynamics in seawater deposited via aerosols are analyzed using chemical analysis by means of field surveys and model analyses. We performed a shipboard experiment using seawater spiked with snow-solution including aerosols in order to elucidate the influence of aerosol additions on the growth and community structures of marine microorganisms. The snow samples including aerosol particles transported by westerly winds were obtained from Mt. Tateyama. The seawater spiked with snow-solution was incubated on a ship at the sampling site in the Pacific Ocean at a distance of 70 km from Omaezaki in Shizuoka prefecture. The sampling site is under oligotrophic conditions. The chlorophyll concentrations of micro-plankton （＞20 μm） indicated an increase in the snow-solution spiked seawater corresponding to the decrease in nitrate during the 3 days of incubation. In total bacterial communities, the number of Rhodobacterace and OM60 clade increased in the snow-solution spiked seawater. Presumably, the deposition of aerosols included in snow can potentially alter microalgal amounts and bacterial communities structures in marine environments.
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  • Characterization of Oceanobacillus Alkaliphilic Protease Expressed in Brevibacillus choshinensis
    Hiromasa ONISHI, Makoto MIZUKAMI, Hiroshi HANAGATA, Sayaka WASHIMI, Ta ...
    2016 Volume 70 Issue 1 Pages 41-48
    Published: 2016
    Released on J-STAGE: September 27, 2017
    DOIhttps://doi.org/10.11457/swsj.70.1_41
    JOURNAL FREE ACCESS
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    Alkaliphilic and extremely halo-tolerant bacterium, Oceanobacillus iheyensis HTE831, isolated from deep-sea sediment at a depth of 1050 m by Lu et al. ［FEMS Microbiol. Lett., 205, 291-297 （2001）］ encodes subtilisin-like protease gene（OB2598）. This O. iheyensis subtilisin-like protease（OihS）was expressed in a Brevibacillus choshinensis expression-secretion system, partially purified, and then characterized. B. choshinensis cells harboring expression vector pBIC2-OihS-His, encoding signal sequence of Brevibacillus cell wall protein-pro-OihS-His-tag protein, secreted the OihS as a pro-form to the culture medium. Subsequently, this pro-form was observed to have been processed to mature form in the culture medium. Partially purified OihS protein showed the highest proteolytic activity at 60 ℃ and pH 10-11. The proteolytic activity and stability were enhanced by the addition of Ca＋＋ ions. The primary sequence homology and its heat-stability suggested that OihS belongs to the thermostable and alkaliphilic thermitase-family of subtilases.
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Short Paper
Relay Essay (17)
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