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Article
In situ measurement of the urea decomposition rate and its turnover rate in the Pacific Ocean
The in situ decomposition rate of urea was measured using 14C-labelled urea at 3 areas in the North Pacific Ocean: Sagami Bay on the southern coast of central Japan, the northwestern Pacific central waters and th...
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Article
Decomposition of urea associated with photosynthesis of phytoplankton in coastal waters
Decomposition of urea in seawater was studied in Mikawa Bay, a shallow eutrophic bay on the southern coast of central Japan. The urea concentration in seawater ranged from 1.3 to 5.9 μg-at. N/1 and comprised 1...
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Article
Microbial CO2 Fixation in the Anoxic Zone in a Volcanic Acid Lake
MEASUREMENT of CO2 uptake using the 14C technique1 in a volcanic acid lake Katanuma, in northwestern Japan, showed that microorganisms assimilate CO2 in dark and anoxic conditions even though the pH of water is a...
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Chapter
The Formation of the Chlorophyll Maximum in the Indian Ocean
A typical section of chlorophyll a distribution is shown in Fig. 1. As for the surface water, the amount of chlorophyll a was 0.1 mg m-3 in the nothern area and below 0.05 mg m-3 in the southern area. A distinct ...
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Article
Chlorophyll maxima in Kuroshio and adjacent area
Fluorometric determination of chlorophyll a and pheopigments was carried out in the sea area off southern Japan. Maximum concentration of chlorophyll pigments was determined to be at or below the lower limit o...
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Article
Excitation spectra in the fluorometric determination of chlorophyll-a and pheophytin-a
In the fluorometric method of chlorophyll determination, the ratio of fluorescence intensities for chlorophyll-a before and after acidification (the so called “acid factor”) varies in a fairly wide range. The ...
