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| Titel |
Phosphate monoesterase and diesterase activities in the North and South Pacific Ocean |
| VerfasserIn |
M. Sato, R. Sakuraba, F. Hashihama |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 11 ; Nr. 10, no. 11 (2013-11-27), S.7677-7688 |
| Datensatznummer |
250085442
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| Publikation (Nr.) |
 copernicus.org/bg-10-7677-2013.pdf |
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| Zusammenfassung |
| Phosphate monoesterase and diesterase activities were measured with soluble
reactive phosphorus (SRP) and labile and total dissolved organic phosphorus
(DOP) concentrations in the North and South Pacific Ocean, to reveal the
microbial utilization of phosphate esters in the Pacific Ocean. Both
esterase activities were noticeably enhanced around the western part of 30° N,
where the surface SRP concentration was below 10 nM, while
they showed no significant correlation with DOP concentration. The
proportion of the activity in the dissolved fraction was higher for
diesterase than monoesterase, which may support results from previous
genomic analyses. Substrate affinity and the maximum hydrolysis rate of
monoesterase were the highest at lower concentrations of SRP, showing the
adaptation of microbes to inorganic phosphorus nutrient deficiency at the
molecular level. The calculated turnover time of monoesters was 1 to 2 weeks
in the western North Pacific Ocean, which was much shorter than the turnover
time in other areas of the Pacific Ocean but longer than the turnover time
in other phosphate-depleted areas. In contrast, the turnover rate of
diesters was calculated to exceed 100 days, revealing that diesters in the
western North Pacific were a biologically refractory phosphorus fraction. In
the present study, it was revealed that both phosphate monoesters and
diesters can be a phosphorus source for microbes in the phosphate-depleted
waters, although the dynamics of the two esters are totally different. |
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