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Volume 20, Issue 3
Displaying 1-5 of 5 articles from this issue
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Masahide TOMINAGA1964 Volume 20 Issue 3 Pages 103-109
Published: August 30, 1964
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSWhen winds blow over the surface of sea where steady comparatively strong currents exist, energy fed from the winds to waves per one wave length is increased or decreased according as the waves travel against the currents or down the currents. Consequently, wave height of a single train of sine waves must be increased or decreased by a factor derived from the hydrodynamical equations, compared with the case of waves generating on a still water surface. The rates of increase or decrease of a significant height for waves with random phase generating on a surface of currents have been derived. The rates are found to be related to U cos θ/v where U cos θ is the component of the current velocity in the direction of waves and v the anemometer wind speed. Results of actual wave observations made by Ryofu-maru IGY cruise, June 1957 on the sea off the Sanriku district, Japan, show rough agreement with the above theory.View full abstractDownload PDF (1076K) -
Tamotsu MATSUMOTO, Masatada SATAKE, Yutaka HIRATA1964 Volume 20 Issue 3 Pages 110-116
Published: August 30, 1964
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSThe contents of macro constituent elements in marine invertebrates such as Octopus, Sepia, Ostrea, Horothuria and Aurelia which live in the eastern area of Seto Inland Sea have been investigated. The amounts of sodium, magnesium, chlorine and sulfur contained in those invertebrates are smaller than those in the sea water, except potassium content in animals other than Ostrea and Aurelia, which is larger than that in the sea water. The atomic ratios K/Na, Ca/Mg and S/P in these animals are generally smaller than 1, except that the value S/P in Holothuria is 2, and in Aurelia 3. The atomic ratio S/Cl is about 0.1-0.3, and Si/Cl about 0.1 or less.View full abstractDownload PDF (941K) -
Tamotsu MATSUMOTO, Masatada SATAKE, Junko YAMAMOTO, Sachiko HARUNA1964 Volume 20 Issue 3 Pages 117-121
Published: August 30, 1964
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSThe contents of micro constituent elements in marine invertebrates such as Octopus, Sepia, Holothuria and Aurelia have been investigated. The determinations of copper, zinc, cadmium and lead were polarographically conducted on the solutions obtained from their dithizone complexes which had been extracted by use of chloroform. The determinations of iron and aluminium were colorimetrically performed on their oxine complexes extracted by use of chloroform. Octopus and Sepia generally contain appreciable amounts of these micro constituents, and especially in their livers the quantity of copper, zinc and iron amounts to a few percent. Holothuria contains aluminium, iron and lead in considerable quantity. The animal of lower order like Aurelia contains very small amount of all the metals determined. Comparing with the concentrations in the sea water, most of the metals are much condensed in these animals. The atomic ratio Cu/Zn in these invertebrates is generally 0.2-0.5, but the value Fe/Al is variable and extremely larger than that in the sea water.View full abstractDownload PDF (776K) -
Participation in the Microcosm at Static ConditionHumitake SEKI1964 Volume 20 Issue 3 Pages 122-134
Published: August 30, 1964
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSSeveral attempts were made to investigate the microbial ability to convert dissolved organic materials, which are found in appreciable concentrations in sea water, and the role it plays in the food cycle.
As soon as there is polypeptone in sea water, proliferation of marine bacteria is observed and intense reducing condition of the medium is developed. The existence of marine protozoan, however, is greatly responsible for the rapid recovery from the reducing condition. Sufficient amounts of dissolved organic materials, much larger than that necessary to sustain maximum bacterial number in biological space, are favourable to make the flocs of bacteria. The growth of brine shrimp cultured in a system of protozoa and bacteria have been found to be excellent, whereas it was observed that brine shrimp could not grow well in a system of bacteria only. The organic materials gained by brine shrimp in the system of protozoa and bacteria can also be controled by the density of brine shrimps. Brine shrimp began to die in prolonged cultures, when ammonia concentration was more than 5.30 mg N in l.View full abstractDownload PDF (1981K) -
[in Japanese]1964 Volume 20 Issue 3 Pages 135-147
Published: August 30, 1964
Released on J-STAGE: June 17, 2011
JOURNAL FREE ACCESSDownload PDF (1947K)
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