I
Isao Koike
Researcher at University of Tokyo
Publications - 86
Citations - 4993
Isao Koike is an academic researcher from University of Tokyo. The author has contributed to research in topics: Nitrate & Dissolved organic carbon. The author has an hindex of 38, co-authored 86 publications receiving 4710 citations. Previous affiliations of Isao Koike include University of the Ryukyus.
Papers
More filters
Journal ArticleDOI
Production of Refractory Dissolved Organic Matter by Bacteria
TL;DR: Results suggest that microbial processes alter the molecular structure of DOM, making it resistant to further degradation and thereby preserving fixed carbon in the ocean.
Journal Article
The Importance of marine sediment biodiversity in ecosystem processes
Paul V. R. Snelgrove,T Blackburn,Hutchings P.A,Alongi Dm,J. F. Grassle,H Hummel,Gary M. King,Isao Koike,P. J. D. Lambshead,N.B Ramsing,V. Solis–Weiss +10 more
TL;DR: In this article, a small fraction of the micro-, meio-and macroscopic benthic organisms that reside in and on sediments have been described and few estimates of total species numbers and biogeographic pattern have been attempted, but there is sufficient information on a few species to suggest that sedimentary organisms significantly impact major ecological processes.
Journal ArticleDOI
Denitrification and ammonia formation in anaerobic coastal sediments.
Isao Koike,Akihiko Hattori +1 more
TL;DR: The reduction rate data suggest that the pathway of nitrate reduction to ammonia is important in coastal sediments.
Journal ArticleDOI
Abundance of viruses in marine waters: assessment by epifluorescence and transmission electron microscopy.
TL;DR: Although a large variation in virus abundance was obtained with the transmission electron microscopy method, the ratio of 4',6-diamidino-2-phenylindole-reactive tiny particles to viruses was in a rather narrow range, indicating that the majority of the tiny DNA-associated particles identified by epifluorescence microscopy were actually virus particles.
Journal ArticleDOI
Estimates of Denitrification and Nitrification in Coastal and Estuarine Sediments
TL;DR: Investigation of nitrification and nitrification in sediments of Tama Estuary and Odawa Bay, Japan found that nitrogenous oxides derived from ammonium accounted for only 6 to 9% of the N(2) evolution by denitrification.