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List of works by Keisuke Koba

A Non‐steady State Model Based on Dual Nitrogen and Oxygen Isotopes to Constrain Moss Nitrate Uptake and Reduction

scientific article published in 2020

A novel pyrroloquinoline quinone-dependent 2-keto-D-glucose dehydrogenase from Pseudomonas aureofaciens

scientific article

A simple and rapid GC/MS method for the simultaneous determination of gaseous metabolites

scientific article published on 31 October 2010

Ammonium first: natural mosses prefer atmospheric ammonium but vary utilization of dissolved organic nitrogen depending on habitat and nitrogen deposition

scientific article published on 21 May 2013

Analytical techniques for quantifying (15)N/(14)N of nitrate, nitrite, total dissolved nitrogen and ammonium in environmental samples using a gas chromatograph equipped with a quadrupole mass spectrometer

scientific article published on 01 January 2011

Biogeochemistry of nitrous oxide in Lake Kizaki, Japan, elucidated by nitrous oxide isotopomer analysis

scholarly article

Biomass production and energy source of thermophiles in a Japanese alkaline geothermal pool

scientific article published on 29 October 2009

Carbon autonomy of reproductive shoots of Siberian alder (Alnus hirsuta var. sibirica)

scientific article published on 08 March 2003

Consequences of microbial diversity in forest nitrogen cycling: diverse ammonifiers and specialized ammonia oxidizers

scientific article published on 03 September 2019

Contribution of atmospheric nitrate to stream-water nitrate in Japanese coniferous forests revealed by the oxygen isotope ratio of nitrate

scientific article published on 01 May 2010

Convergence of soil nitrogen isotopes across global climate gradients.

scientific article

Delta15N of soil N and plants in a N-saturated, subtropical forest of southern China.

scientific article published on September 2010

Drivers of atmospheric nitrate processing and export in forested catchments

article published in 2015

Ecological interpretations of nitrogen isotope ratios of terrestrial plants and soils

article

Hadal biosphere: insight into the microbial ecosystem in the deepest ocean on Earth

scientific article

High abundance of ammonia-oxidizing archaea in acidified subtropical forest soils in southern China after long-term N deposition.

scientific article published on 20 January 2012

Higher diversity and abundance of denitrifying microorganisms in environments than considered previously

scientific article published on 10 March 2015

Influence of δ18 O of water on measurements of δ18 O of nitrite and nitrate

scientific article published on 14 October 2020

Isotopic Elucidation of Microbial Nitrogen Transformations in Forest Soils

scientific article published in 2021

Isotopocule analysis of biologically produced nitrous oxide in various environments.

scientific article published on 13 April 2015

Isotopomeric analysis of N2O dissolved in a river in the Tokyo metropolitan area

scientific article published on March 2009

Low δ18O values of nitrate produced from nitrification in temperate forest soils

scientific article published on 10 August 2012

Major contribution of sulfide‐derived sulfur to the benthic food web in a large freshwater lake

scientific article published in 2023

Microbial denitrification dominates nitrate losses from forest ecosystems

scientific article

Microbial methane production in deep aquifer associated with the accretionary prism in Japan.

scientific article published on 3 December 2009

Molecular biological and isotopic biogeochemical prognoses of the nitrification-driven dynamic microbial nitrogen cycle in hadopelagic sediments

scientific article

Multipath ecological influence of an iteroparous fish migration from Lake Biwa to an alluvial stream

scientific article published in 2023

Multiyear Measurements on Δ17O of Stream Nitrate Indicate High Nitrate Production in a Temperate Forest

scientific article published on 24 March 2020

Nitrate dynamics in natural plants: insights based on the concentration and natural isotope abundances of tissue nitrate

scientific article

Nitrate is an important nitrogen source for Arctic tundra plants

scientific article published on 14 March 2018

Nitrification-driven forms of nitrogen metabolism in microbial mat communities thriving along an ammonium-enriched subsurface geothermal stream

scholarly article

Nitrogen and Oxygen Isotope Effects of Ammonia Oxidation by Thermophilic Thaumarchaeota from a Geothermal Water Stream

scientific article published on 13 May 2016

Physiological and isotopic characteristics of nitrogen fixation by hyperthermophilic methanogens: Key insights into nitrogen anabolism of the microbial communities in Archean hydrothermal systems

scholarly article

Pitfalls and new mechanisms in moss isotope biomonitoring of atmospheric nitrogen deposition

scientific article published on 02 November 2012

Preliminary insights into δ15N and δ18O of nitrate in natural mosses: a new application of the denitrifier method

scientific article published on 10 November 2011

Retention of deposited ammonium and nitrate and its impact on the global forest carbon sink

scientific article

Role of nitrification and denitrification on the nitrous oxide cycle in the eastern tropical North Pacific and Gulf of California

scholarly article

Seasonal change in microbial sulfur cycling in monomictic Lake Fukami-ike, Japan

article

The natural abundance of 15N in plant and soil-available N indicates a shift of main plant N resources to NO3(-) from NH4(+) along the N leaching gradient

scientific article published in April 2010

Variations in nitrogen-15 natural abundance of plant and soil systems in four remote tropical rainforests, southern China

scientific article published on 2 October 2013

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