Chikage Yoshimizu

Sources of nitrate and ammonium contamination in groundwater under developing Asian megacities

Yu Umezawa, Takahiro Hosono, Shin‐ichi Onodera et al. · The Science of The Total Environment · 2008 · 138 citations

Natural Sciences, Earth Sciences, Hydrology +14

Multiple isotope (H, O, N, S and Sr) approach elucidates complex pollution causes in the shallow groundwaters of the Taipei urban area

Takahiro Hosono, Chung‐Ho Wang, Yu Umezawa et al. · Journal of Hydrology · 2010 · 96 citations

Natural Sciences, Earth Sciences, Hydrology +17

Spatial distribution of nitrate sources of rivers in the Lake Biwa watershed, Japan: Controlling factors revealed by nitrogen and oxygen isotope values

Nobuhito Ohte, Ichiro Tayasu, Ayato Kohzu et al. · Water Resources Research · 2010 · 79 citations · Full text

Natural Resources, Earth Sciences, Environmental Sciences +17

Seasonal shifts in the contributions of the Changjiang River and the Kuroshio Current to nitrate dynamics in the continental shelf of the northern East China Sea based on a nitrate dual isotopic composition approach

Yu Umezawa, Akira Yamaguchi, Joji Ishizaka et al. · Biogeosciences · 2014 · 66 citations · Full text

Natural Sciences, Earth Sciences, Oceanography +17

Stable nitrogen isotopic composition of amino acids reveals food web structure in stream ecosystems

Naoto F. Ishikawa, Yoshikazu Kato, Hiroyuki Togashi et al. · Oecologia · 2014 · 58 citations · Full text

Life Sciences, Biochemistry, Ecology +14