Kazuhiko Kobayashi

ORCID: 0000-0003-4101-2975
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About
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Research Areas
  • Plant responses to elevated CO2
  • Atmospheric chemistry and aerosols
  • Plant Water Relations and Carbon Dynamics
  • Soil Carbon and Nitrogen Dynamics
  • Air Quality and Health Impacts
  • Rice Cultivation and Yield Improvement
  • Advanced Machining and Optimization Techniques
  • Crystallization and Solubility Studies
  • X-ray Diffraction in Crystallography
  • Climate change impacts on agriculture
  • Crop Yield and Soil Fertility
  • Advanced machining processes and optimization
  • Plant Stress Responses and Tolerance
  • Agriculture, Soil, Plant Science
  • Atmospheric and Environmental Gas Dynamics
  • Advanced Surface Polishing Techniques
  • Atmospheric Ozone and Climate
  • Climate variability and models
  • Agricultural Systems and Practices
  • Air Quality Monitoring and Forecasting
  • Light effects on plants
  • Engineering Applied Research
  • Plant responses to water stress
  • Soybean genetics and cultivation
  • Greenhouse Technology and Climate Control

The University of Tokyo
2016-2025

Saitama Cancer Center
2020-2024

National Institute for Environmental Studies
2022-2023

Asahi General Hospital
2023

National Institute for Japanese Language and Linguistics
2023

Macquarie University
2022

Chinese Academy of Sciences
2019-2022

University of Florida
2001-2022

University of Nottingham
2022

The University of Sydney
2022

When output ( x ) of a mechanistic model is compared with measurement y ), it common practice to calculate the correlation coefficient between and , regress on . There are, however, problems in this approach. The assumption regression, that linearly related not guaranteed unnecessary for – comparison. regression coefficients are explicitly other commonly used statistics [e.g., root mean squared deviation (RMSD)]. We present an approach based (MSD = RMSD 2 show better suited comparison than...

10.2134/agronj2000.922345x article EN Agronomy Journal 2000-03-01

This Tropospheric Ozone Assessment Report (TOAR) on the current state of knowledge ozone metrics relevance to vegetation (TOAR-Vegetation) reports present-day global distribution at over 3300 vegetated sites and long-term trends nearly 1200 sites. TOAR-Vegetation focusses three vegetation-relevant time-periods across major world climatic zones: M12, mean during 08:00–19:59; AOT40, accumulation hourly values 40 ppb daylight hours, W126 with stronger weighting higher values, accumulated...

10.1525/elementa.302 article EN cc-by Elementa Science of the Anthropocene 2018-01-01

Assessment of spatial and temporal variation in the impacts ozone on human health, vegetation, climate requires appropriate metrics. A key component Tropospheric Ozone Report (TOAR) is consistent calculation these metrics at thousands monitoring sites globally. Investigating trends required that same statistical methods be applied across sites. The nonparametric Mann-Kendall test (for significant trends) Theil-Sen estimator estimating magnitude trend) were selected to provide robust all This...

10.1525/elementa.279 article EN cc-by Elementa Science of the Anthropocene 2018-01-01

Abstract We quantitatively evaluated the effects of elevated concentration ozone (O 3 ) on growth, leaf chemistry, gas exchange, grain yield, and quality relative to carbon‐filtered air (CF) by means meta‐analysis published data. Our database consisted 53 peer‐reviewed studies between 1980 2007, taking into account wheat type, O fumigation method, rooting environment, ([O ]), developmental stage, additional treatments such as drought carbon dioxide ([CO 2 ]). The results suggested that [O ]...

10.1111/j.1365-2486.2008.01673.x article EN Global Change Biology 2008-08-04

Introduction of high-performing crop cultivars and crop/soil water management practices that increase the stomatal uptake carbon dioxide photosynthesis will be instrumental in realizing United Nations Sustainable Development Goal (SDG) achieving food security. To date, however, global assessments how to yield have failed consider negative effects tropospheric ozone, a gaseous pollutant enters leaf pores plants along with dioxide, is increasing concentration globally, particularly rapidly...

10.1111/gcb.14157 article EN Global Change Biology 2018-03-31

Abstract Increasing both crop productivity and the tolerance of crops to abiotic biotic stresses is a major challenge for global food security in our rapidly changing climate. For first time, we show how spatial variation severity tropospheric ozone effects on yield compare with other scale, discuss mitigating actions against negative ozone. We that sensitivity declines order soybean > wheat maize rice, genotypic response being most pronounced rice. Based stomatal uptake, estimate (mean...

10.1111/gcb.14381 article EN cc-by Global Change Biology 2018-08-07

In slowly progressive type 1 diabetes mellitus (SPIDDM), the pancreas shows sustained islet inflammation, pancreatitis, pancreatic acinar cell metaplasia/dysplasia (ADM), and intraepithelial neoplasia (PanIN), a precancerous lesion. The mechanisms underlying these changes remain unclear. presence of enterovirus (EV) encoded-capsid protein (VP1) -2A protease (2Apro) innate immune responses were studied using immunohistochemistry in situ hybridization 12 SPIDDM 19 non-diabetic control...

10.1038/s41598-023-33011-7 article EN cc-by Scientific Reports 2023-04-28

Summary The effects of elevated CO 2 are reported here on the uptake nitrogen (N) and its relationships with growth grain yield in rice ( Oryza sativa ). Using free‐air enrichment (FACE), crops were grown at ambient or (c. 300 µmol mol −1 above ambient) supplied low, medium high levels N. For N treatments, FACE increased panicle initiation but not maturity. total dry matter, as well spikelet number yield, positive interactions between observed. Furthermore, was closely associated initiation....

10.1046/j.1469-8137.2001.00111.x article EN New Phytologist 2001-05-01

Summary A free air CO 2 enrichment (FACE) system in which rice was grown under elevated conditions by releasing high pressure, pure from emission tubes surrounding the crop is described here. Unlike other systems, blowers were not used to mix emitted with air. Four 12‐m diameter structures (‘rings’) constructed. Monitoring and control of carried out a series wind sensors, data loggers, controllers valves. The target concentration ([CO ]) 200 µmol mol −1 above ambient; continuously. Temporal...

10.1046/j.1469-8137.2001.00097.x article EN New Phytologist 2001-05-01

Two modern cultivars [Yangmai16 (Y16) and Yangfumai 2 (Y2)] of winter wheat (Triticum aestivum L.) with almost identical phenology were investigated to determine the impacts elevated ozone concentration (E-O3) on physiological characters related photosynthesis under fully open-air field conditions in China. The plants exposed from initiation tillering final harvest, E-O3 127% ambient (A-O3). Measurements pigments, gas exchange rates, chlorophyll a fluorescence lipid oxidation made three...

10.1111/j.1365-2486.2010.02184.x article EN Global Change Biology 2010-01-20

Abstract Over time, the stimulative effect of elevated CO 2 on photosynthesis rice crops is likely to be reduced with increasing duration exposure, but resultant effects crop productivity remain unclear. To investigate seasonal changes in growth ( Oryza sativa L.) crops, a free air enrichment (FACE) experiment was conducted at Shizukuishi, Iwate, Japan 1998–2000. The target concentration FACE plots 200 µmol mol −1 above that ambient. Three levels nitrogen (N) were supplied: low (LN, 4 g N m...

10.1046/j.1365-2486.2003.00641.x article EN Global Change Biology 2003-05-29

Abstract A comprehensive biogeochemistry model, DNDC, was revised to simulate crop growth and soil processes more explicitly improve its ability estimate methane (CH 4 ) emission from rice paddy fields under a wide range of climatic agronomic conditions. The model simulates by tracking photosynthesis, respiration, C allocation, tillering, release organic O 2 roots. For anaerobic processes, it quantifies the production electron donors [H dissolved carbon (DOC)] decomposition root exudation,...

10.1111/j.1365-2486.2007.01475.x article EN Global Change Biology 2007-10-29

A key part of the uncertainty in terrestrial feedbacks on climate change is related to how and what extent nitrogen (N) availability constrains stimulation productivity by elevated CO2 (eCO2 ), whether or not this constraint will become stronger over time. We explored ecosystem-scale relationship between responses plant N acquisition eCO2 free-air enrichment (FACE) experiments grassland, cropland forest ecosystems found that: (i) all three ecosystem types, was positive, linear strong (r(2) =...

10.1111/gcb.12938 article EN Global Change Biology 2015-04-03

Although antithyroid drug (ATD)-induced hematopoietic damage is a significant concern, it has not been comprehensively investigated.Our objective was to describe the clinical features of ATD-induced damage.This retrospective cohort study in Tokyo, Japan.Between January 1983 and December 2002, 50,385 patients at Ito Hospital were diagnosed with Graves' disease. We retrospectively reviewed their medical, pathological, laboratory records between 2010.Incidence agranulocytosis pancytopenia...

10.1210/jc.2011-2221 article EN The Journal of Clinical Endocrinology & Metabolism 2011-11-02

Four modern cultivars of winter wheat (Triticum aestivum L.) were grown under elevated ozone concentration (E-O3) in fully open-air field conditions China for three consecutive growth seasons from 2007 to 2009. Results indicated that a mean 25% enhancement above the ambient (A-O3, 45.7 p.p.b.) significantly reduced grain yield by 20% with significant variation range 10% 35% among combinations cultivar and season. The varietal difference response E-O3 became nonsignificant when anova was done...

10.1111/j.1365-2486.2011.02400.x article EN Global Change Biology 2011-01-21

Using a high-resolution (40 × 40 km) chemical transport model coupled with the Regional Emission inventory in Asia (REAS), we simulated surface ozone concentrations ([O3 ]) and evaluated O3 -induced wheat production loss China India for years 2000 2020 using dose-response functions based on AOT40 (accumulated [O3 ] above ppb) PODY (phytotoxic dose, accumulated stomatal flux of threshold Y nmol m(-2) s(-1) ). Two dose metrics (90 days POD6 ) were derived from European experiments, other two...

10.1111/gcb.12252 article EN Global Change Biology 2013-05-09

ABSTRACT Context : Ozone concentrations near the land surface are rising in Asia while they declining or stagnating Europe and North America. is most widespread air pollutant negatively affecting vegetation, its increased pose a major threat to food quality production other ecosystem services Asia. Method In this review, we provide an overview of scientific challenges impacts ozone pollution on Asian synthesize toward mitigation impacts. Result We argue that new policy initiatives need seek...

10.1080/20964129.2021.1911602 article EN cc-by Ecosystem health and sustainability 2021-01-01
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