Takeo Hama

2.5k total citations
64 papers, 2.0k citations indexed

About

Takeo Hama is a scholar working on Oceanography, Ecology and Environmental Chemistry. According to data from OpenAlex, Takeo Hama has authored 64 papers receiving a total of 2.0k indexed citations (citations by other indexed papers that have themselves been cited), including 53 papers in Oceanography, 33 papers in Ecology and 9 papers in Environmental Chemistry. Recurrent topics in Takeo Hama's work include Marine and coastal ecosystems (48 papers), Isotope Analysis in Ecology (20 papers) and Microbial Community Ecology and Physiology (16 papers). Takeo Hama is often cited by papers focused on Marine and coastal ecosystems (48 papers), Isotope Analysis in Ecology (20 papers) and Microbial Community Ecology and Physiology (16 papers). Takeo Hama collaborates with scholars based in Japan, India and Indonesia. Takeo Hama's co-authors include Masayuki Takahashi, Nobuhiko Handa, Shigeki Wada, S. Ichimura, Toshio Iwakuma, Tatsuo Miyazaki, Yohsuke Ogawa, Akira Otsuki, Naofumi Handa and Yuko Omori and has published in prestigious journals such as Journal of Geophysical Research Atmospheres, Limnology and Oceanography and Journal of Neurology Neurosurgery & Psychiatry.

In The Last Decade

Takeo Hama

64 papers receiving 1.9k citations

Peers

Takeo Hama

OCEAN

ECOLO

GPC

Masayuki Takahashi Japan

Gustavo Ferreyra Argentina

Satoru Taguchi Japan

Serge Demers Canada

Michael Meyerhöfer Germany

PJ Harrison Canada

Olga Mangoni Italy

Lesley Clementson Australia

Maurice Levasseur Canada

Susanna Hajdu Sweden

Masayuki Takahashi Japan

Takeo Hama

1.7k ×1.1

OCEAN

1.0k ×1.1

ECOLO

504 ×1.4

361 ×1.0

GPC

175 ×1.1

Citations per year, relative to Takeo Hama Takeo Hama (= 1×) peers Masayuki Takahashi

Countries citing papers authored by Takeo Hama

Since Specialization

Citations

This map shows the geographic impact of Takeo Hama's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Takeo Hama with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Takeo Hama more than expected).

Fields of papers citing papers by Takeo Hama

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Takeo Hama. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Takeo Hama. The network helps show where Takeo Hama may publish in the future.

Co-authorship network of co-authors of Takeo Hama

This figure shows the co-authorship network connecting the top 25 collaborators of Takeo Hama. A scholar is included among the top collaborators of Takeo Hama based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Takeo Hama. Takeo Hama is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

Wada, Shigeki, Masao Ishii, Naohiro Kosugi, et al.. (2020). Seasonal dynamics of seawater CO2 system at a coastal site near the southern tip of Izu Peninsula, Japan. Journal of Oceanography. 76(3). 227–242. 2 indexed citations

Irving, Louis, et al.. (2019). Differential carbon allocation to nitrogen-rich patches in Poa annua precedes root proliferation but has no immediate benefit to N uptake. Journal of Plant Physiology. 234-235. 54–59. 6 indexed citations

Wada, Shigeki, et al.. (2019). Vertical and seasonal variations of dissolved iodine concentration in coastal seawater on the northwestern Pacific coast of central Japan. Continental Shelf Research. 188. 103966–103966. 9 indexed citations

Wada, Shigeki, et al.. (2017). Production and degradation of fluorescent dissolved organic matter derived from bacteria. Journal of Oceanography. 74(1). 39–52. 19 indexed citations

Wada, Shigeki & Takeo Hama. (2013). The contribution of macroalgae to the coastal dissolved organic matter pool. Estuarine Coastal and Shelf Science. 129. 77–85. 58 indexed citations

Nomoto, Shinya, et al.. (2012). Comprehensive Determination of Chlorophyll Derivatives by Chromic Acid Oxidation. Chemistry Letters. 41(6). 571–573. 1 indexed citations

Watanabe, Keiji, et al.. (2012). Fluorescence characteristics of humic-like fluorescent dissolved organic matter produced by various taxa of marine bacteria. Aquatic Microbial Ecology. 65(3). 249–260. 56 indexed citations

Hama, Takeo, Yuko Omori, Shigeki Wada, et al.. (2011). Effect of ocean acidification on coastal phytoplankton composition and accompanying organic nitrogen production. Journal of Oceanography. 68(1). 183–194. 14 indexed citations

Hirayama, Masaaki, Tomohiko Nakamura, Norio Hori, et al.. (2010). Pupillary autonomic dysfunction in multiple system atrophy and Parkinson’s disease: an assessment by eye-drop tests. Clinical Autonomic Research. 20(3). 191–197. 15 indexed citations

10.

Suzuki, Keisuke, Masahisa Katsuno, Haruhiko Banno, et al.. (2009). The profile of motor unit number estimation (MUNE) in spinal and bulbar muscular atrophy. Journal of Neurology Neurosurgery & Psychiatry. 81(5). 567–571. 20 indexed citations

11.

Omori, Yuko, et al.. (2009). Bacterial production of marine humic-like fluorescent dissolved organic matter and its biogeochemical importance. Aquatic Microbial Ecology. 58. 55–66. 65 indexed citations

12.

Yoshimura, Kazuya, Takanori Ogawa, & Takeo Hama. (2009). Degradation and dissolution properties of photosynthetically-produced phytoplankton lipid materials in early diagenesis. Marine Chemistry. 114(1-2). 11–18. 18 indexed citations

13.

Hama, Takeo, et al.. (2008). Spatial and temporal changes in the concentration of various phosphorus pools and their possible biogeochemical roles in the oligotrophic subtropical western North Pacific. Journal of Geophysical Research Atmospheres. 113(C3). 3 indexed citations

14.

Wada, Shigeki, et al.. (2007). Quantitative and qualitative analyses of dissolved organic matter released from Ecklonia cava Kjellman, in Oura Bay, Shimoda, Izu Peninsula, Japan. Journal of Experimental Marine Biology and Ecology. 349(2). 344–358. 144 indexed citations

15.

Sakashita, Tetsuya, Takeo Hama, Shoichi Fuma, et al.. (2002). Effects of gamma-irradiation on CO2 fixation and. Journal of Radioanalytical and Nuclear Chemistry. 254(2). 401–403. 1 indexed citations

16.

Goés, Joaquim I., Nobuhiko Handa, Satoru Taguchi, Takeo Hama, & Hiroaki Saito. (1995). Impact of UV radiation on the production patterns and composition of dissolved free and combined amino acids in marine phytoplankton. Journal of Plankton Research. 17(6). 1337–1362. 29 indexed citations

17.

Hama, Takeo, Katsuji Matsunaga, Nobuhiko Handa, & Mikio Takahashi. (1990). Composition of photosynthetic products in Lake Biwa, Japan; vertical and seasonal changes and their relation to environmental factors. Journal of Plankton Research. 12(1). 133–147. 9 indexed citations

18.

Hama, Takeo, et al.. (1987). Determination of amino acid production rate of a marine phytoplankton population with 13C and gas chromatography‐mass spectrometry1. Limnology and Oceanography. 32(5). 1144–1153. 25 indexed citations

19.

Hama, Takeo & Nobuhiko Handa. (1987). Pattern of organic matter production by natural phytoplankton population in a eutrophic lake 1. Intracellular products. Archiv für Hydrobiologie. 109(1). 107–120. 25 indexed citations

20.

Hama, Takeo & Nobuhiko Handa. (1981). Volatile Organic Acids in Lake Water;Their Gas Chromatographic Determination and Ecological Significance. Japanese Journal of Limnology (Rikusuigaku Zasshi). 42(1). 8–19. 7 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

Explore authors with similar magnitude of impact