DEEP OCEAN WATER RESEARCH
Online ISSN : 1884-958X
Print ISSN : 1345-8477
ISSN-L : 1345-8477
Volume 1, Issue 1
Displaying 1-14 of 14 articles from this issue
  • Koji NAKAGAWA, Yoshindo YOKOYAMA, Hiroshi NAKAJIMA, Yoshinari IKEGAMI
    2000 Volume 1 Issue 1 Pages 1-4
    Published: July 20, 2000
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    Recently, mineral nutrients have attracted attention in accordance with a rise of the consciousness of health from the standpoint of preventive medicine. The 6 th recommended daily allowance was worked out, and 10 kinds of elements including magnesium, zinc, copper, manganese, iodine, selenium were additionally determined as mineral nutrients besides iron and calcium. We attempted to apply deep sea water to high mineral content drinks and foods.
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  • Masayuki KOMATSU
    2000 Volume 1 Issue 1 Pages 5-11
    Published: July 20, 2000
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    Recently, the deep ocean water is drawing attention as a recyclable resource.
    The author made models explain relations between methods on discharging of the deep ocean water and enrich shallow sea using a numerical simulation as an experiment. The author used a 3-D general-purpose heat flow analysis program for calculation of these models. The behavior of the discharge plume was observed with method of tracing particles. The author tried to evaluate quantitatively the difference among discharge methods, the seabottom shape, influence of subsurface structure and several factors including the distribution of salinity. In this study, 6 cases of discharging into stilling basin were calculated. This calculation was carried out without taking any forcing except for the buoyancy into consideration to simplify it.
    The study on the behavior of the plume under various forces is a future subject.
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  • Kuniaki TAKAGI, Tatsumi INAMURA, Masahiro KAWAJIRI, Kazuo NOYA, Yoshit ...
    2000 Volume 1 Issue 1 Pages 13-18
    Published: July 20, 2000
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    Deep sea water is recently under trial as an efficacious reagent for a cure of atopic dermatitis. However, the biologically effective substances, including cytotoxic compounds, in deep sea water are almost unknown. We investigated the effects of deep sea water on function of mouse macrophage in vitro. We found that 1) mitochondrial activity, active oxygen and NO production in macrophage cells cultured with stimulants were enhanced by pretreatment with deep sea water in depth dependent manner; 2) on the other hand, treatment with deep sea water reduced NO production of preactivated cells in depth dependent manner; 3) the both activities of deep sea water stored in 4°C for one year were lower than that stored in -30°C. These results indicate that substances which are able to affect the immune response exist in deep sea water. The immune response is different way and dependent on host condition.
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  • Shin HIRAYAMA, Seiji OOKUBO, Masashi MIYASAKA
    2000 Volume 1 Issue 1 Pages 19-22
    Published: July 20, 2000
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    SterileUlva, which is a green alga, has the potential to grow all year round, therefore, this macroalga is expected to be a feed resource containing various nutrients such as proteins, amino acids, and minerals. Ulva lactuca was selected from the“Marine Park”in Yokohama, and its growth rate (g-dry/m2·d) was measured using a model reactor simulated the surface of the sea. In these experiments, the growth rate of Ulva lactuca was found to be 15-20 gdry/m2·d which is estimated to be 10 times greater than that in nature field. Based on these data, we newly designed a float type of efficient Ulva lactuca production system. Fifty kg-dry/d of Ulva lactuca without containing foreign substances such as the sands and 1.9 kg-N/d are expected to be harvested when the float type system (60 m wide × 110 m long × 2 m deep) is used with enriched seawater.
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  • Masabumi SETO, Shinya OTAKE, Makoto NAKAMURA
    2000 Volume 1 Issue 1 Pages 23-26
    Published: July 20, 2000
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    Observation of an internal waves was carried out by a baymouth of the Ishikrin bay. In order to ask for the internal wave height of the Ishikari bay and the Shakotan peninsula circumference ocean space, the Coriolis tank was used and Hydraulic model test was carried out. Consequently, the internal waves of a reverse phase angle was observed the almost same period as tide waves in the 40m of the maximum wave height. Moreover, internal wave energy concentrates and the ocean space of 80m or more of wave height accepted to the Ishikari bay and the Iwanai bay. By this investigation, possibility of upwelling utilization using internal wave energy was verified.
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  • Kimio FUKAMI, Jun MATSUMOTO, Tsukasa KADOTA, Yuuya NAKANO, Toshitaka N ...
    2000 Volume 1 Issue 1 Pages 27-31
    Published: July 20, 2000
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    Deep seawater (DSW) samples were collected from 320 m depth layer at an offshore station close to the pipe end of DSW-intake facility of Muroto City in Kochi, and seasonal fluctuations of the water quality of DSW were investigated. Concentrations of dissolved inorganic nitrogen (DIN) and phosphate in DSW varied significantly in the range of 6-26 (average 15.7) μ M and 0.7-1.8 (average 1.2), μM, respectively. High concentrations of these inorganic nutrients apparently corresponded to upwelling seasons. Algal growth potential (AGP) of DSW for a diatom, Skeletonema costatum, also varied from season to season, and high AGP values were obtained when the concentrations of DIN in DSW increased. These results indicate that water quality of DSW fluctuates, to relatively large extent, probably due to possible upwelling events, and seasonal changes in AGP of DSW were resulted from DIN content in DSW.
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  • Ryosuke YAMAMOTO, Nobukazu TANAKA, Hiroyuki OSAWA, Yukihisa WASHIO, Ki ...
    2000 Volume 1 Issue 1 Pages 33-39
    Published: July 20, 2000
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    Deep seawater commands much attention recently because of its low temperature, rich nutrition.and cleanliness. For the purpose of drawing up deep-sea water constantly and inexpensively, the authors are considering to use air-lift pump. This report describes both the.experimental and analytical investigation for air-lift pump performance in case of being used for drawing up deep-sea water. The numerical simulation code based on two-fluid (gasliquid) model was developed, and the results were compared with that of experiments. Consequently, the analytical volume flow rate of lifted water was proved to have a tendency to be larger than that of experimental one in cases the length of suction pipe was quite long, or void rate was very small.
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  • Itaru UMEDA, Keiichi SHOZEN, Isao TATSUMI, Toshimitsu NAKASHIMA, Akio ...
    2000 Volume 1 Issue 1 Pages 41-45
    Published: July 20, 2000
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    The growth characteristics of the marine diatom, Chaeroceros ceratosporum OSTENFELD were examined using a photobioreactor(capacity: 1801)in order to develop a continuous culture system with deep seawater collected from off Namerikawa City in Toyama Prefecture at a depth of 300m. Ch. ceratosporum is a very important microalgal species, preyed on bivalves and other invertebrates. Continuos culture was conducted under optimum temperatures(15-20°C). Long term culture for 131 days including 129 days of stable continuous culture, was successfully carried out using the culture system we developed. Specific growth rate(μ)was 1.08/day under batch culture conditions. The cell yield at 1.0/day dilution rate was similar to that at 1.2/day dilution rate. The maximum cell yield was 791 × 108cells/day at a 1.2/day dilution rate. It is generally known that cells wash out from continuous culture system, if the dilution rate is higher than the specific growth rate.
    Therefore this system should be operated below a 1.2/day dilution rate.
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  • Koji OTSUKA, Akiyoshi BANDO, Yoshitsugu MATSUMOTO
    2000 Volume 1 Issue 1 Pages 47-53
    Published: July 20, 2000
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    Consumable capacity and price of deep ocean water (DOW) were investigated on the assumption that the demand of the deep ocean water significantly increases in all over the world. In the first part of this paper, the limiting rate of upwelling DOW to the total flux of s ource water, which is assumed to be 3.3 % of the total flux, was determined on the basis of a natural fluctuation. The consumable capacities of DOW for several application sites were individually obtained using this limiting rate. In the second part of this paper, an economic a nalysis of a DOW distribution system, which consists of a floating-type upwelling system, three land-based storage systems and several shuttle tankers, was carried out. The results showed that the obtained break-even point price of the DOW is reasonable in comparisonw with the price of the public service water.
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  • Kimio MORINO, Kazuhiro HAGIWARA, Tatsuyoshi HIRATA, Tunemi FUJITA, Tun ...
    2000 Volume 1 Issue 1 Pages 55-61
    Published: July 20, 2000
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    We examined the business possibilities of the deep sea water utilization system which was composed with the high productivity products selected from each field of mariculture, biochemical and the agriculture.
    As a result of the examination, even when there were one half of subsidy to construction of a deep sea-water intake equipment, it found that there was only a profit of the level which the loss doesn't occur to.
    Although reduction of the intake facilities construction expense was consequential in order to materialize industrialization of a deep sea-water utilization technique, it can come, simultaneously being improved by the productivity beyond the present level also at a utilization production side was suggested. From now on, it will become important to develop the efficient production technology of high added value products and the utilization technique which cannot be done if it is not a deep sea-water. Moreover, it was understood that it is also effective that a country and a self-governing body consider as the policy which intended inspiration of area promotion or new-industry creation, and establish an subsidy system to construction of a deep-sea-water intake facilities.
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  • Keiichi SHOZEN, Kazuo HOTTA, Youichi SETO, Isao TATSUMI, Akio HONMA
    2000 Volume 1 Issue 1 Pages 63-69
    Published: July 20, 2000
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    In Toyama Prefectural Fisheries Research Institution, deep seawater (DSW) has been used for aquaculture of cold water/deep-sea species of fish, prawn and shellfish to be drained as various drainage. These drainage were thought to still have the basic characteristics of DSW without greatly changes, as DSW contacted with living thing only once for a short time.
    In order to utilize DSW more effectively, characteristics of the drainage were examined, and experiments re- and multi-use of DSW for aquaculture were carried out. As for characteristics of the drainage, water temperature and the level of dissolved oxygen somewhat varied, and the number of microorganisms slightly rose in the drainage as compared with original DSW, but chemical oxygen demand, pH and salinity was stable. These results demonstrated that the quality of drainage wasn't hardly different from that of original DSW, and the drainage can be applied to aquaculture. The survival rate of pacific cod raised in the DSW (first use) and in the drainage (second use) for 84days was 95% and 75%, respectively.
    Then survival was lower in the second and third use. In the connection, further investigation including growth rate was necessary because survival rate greatly depends on various factors and conditions during culture. When the drainage is used, great attention must be paid to infection of fish disease.
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  • Kenichi ISHII, Kiyotomo YAGIHASHI, Takukumi YAMAGUCHI, Migaku TAKAMATS ...
    2000 Volume 1 Issue 1 Pages 71-77
    Published: July 20, 2000
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    Flexible pipes are incleasingly used to draw up deep ocean water currently attracts many peoples attention as a new resource in the field of marine product industry and others. One of the most important requrements for the flexible pipes to apply in extra deep sea is how to reduce their own weight. Last year, we developed a light weight flexible pipe constructed withcomposite armor wires and installed on the sea bed over the depth of 600m.This paper describesthe process of the development of the lighter pipe required for extra deep sea.
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  • Takeshi TOHMA, Yoshimasa TSUWAKO, Makoto FUJII, Katsunori SHIMIZU, Tet ...
    2000 Volume 1 Issue 1 Pages 79-84
    Published: July 20, 2000
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
    Worldwide attention has recently come to focus on the Earth's Boundless supply of deep seawater whose rich nutrition, low temperature and extreme purity imbues it with high potential. This paper describes the construction of deep seawater intake facilities in Okinawa.
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  • [in Japanese]
    2000 Volume 1 Issue 1 Pages preface1
    Published: July 20, 2000
    Released on J-STAGE: June 28, 2010
    JOURNAL FREE ACCESS
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