7 results on '"Takeshita, Yuichiro"'
Search Results
2. Detection of impurities in m-cresol purple with Soft Independent Modeling of Class Analogy for the quality control of spectrophotometric pH measurements in seawater
- Author
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Fong, Michael B., Takeshita, Yuichiro, Easley, Regina A., and Waters, Jason F.
- Published
- 2024
- Full Text
- View/download PDF
3. Assessment of a pH optode for oceanographic moored and profiling applications.
- Author
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Wirth, Taylor, Takeshita, Yuichiro, Davis, Benjamin, Park, Ellen, Hu, Irene, Huffard, Christine L., Johnson, Kenneth S., Nicholson, David, Staudinger, Christoph, Warren, Joseph K., and Martz, Todd
- Subjects
OPTICAL sensors ,OPTODES ,CARBON dioxide ,DETECTORS ,OCEAN - Abstract
As global ocean monitoring programs and marine carbon dioxide removal methods expand, so does the need for scalable biogeochemical sensors. Currently, pH sensors are widely used to measure the ocean carbonate system on a variety of autonomous platforms. This paper assesses a commercially available optical pH sensor (optode) distributed by PyroScience GmbH for oceanographic applications. Results from this study show that the small, solid‐state pH optode demonstrates a precision of 0.001 pH and relative accuracy of 0.01 pH using an improved calibration routine outlined in the manuscript. A consistent pressure coefficient of 0.029 pH/1000 dbar is observed across multiple pH optodes tested in this study. The response time is investigated for standard and fast‐response versions over a range of temperatures and flow rates. Field deployments include direct comparison to ISFET‐based pH sensor packages for both moored and profiling platforms where the pH optodes experience sensor‐specific drift rates up to 0.006 pH d−1. In its current state, the pH optode potentially offers a viable and scalable option for short‐term field deployments and laboratory mesocosm studies, but not for long term deployments with no possibility for recalibration like on profiling floats. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
4. Offset between profiling float and shipboard oxygen observations at depth imparts bias on float pH and derived pCO2
- Author
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Bushinsky, Seth M, primary, Nachod, Zachary, additional, Fassbender, Andrea J, additional, Tamsitt, Veronica M, additional, Takeshita, Yuichiro, additional, and William, Nancy, additional
- Published
- 2024
- Full Text
- View/download PDF
5. Uncertainty sources for measurable ocean carbonate chemistry variables
- Author
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National Science Foundation (US), National Aeronautics and Space Administration (US), National Oceanic and Atmospheric Administration (US), Commonwealth Scientific and Industrial Research Organisation (Australia), University of South Florida, Miami University, Agencia Estatal de Investigación (España), Cooperative Institute for Climate, Ocean, and Ecosystem Studies, Cooperative Institute For Marine And Atmospheric Studies (US), Carter, Brendan R., Sharp, Jonathan D., Dickson, Andrew G., Álvarez-Rodríguez, Marta, Fong, Michael B., García-Ibáñez, Maribel I., Woosley, Ryan J., Takeshita, Yuichiro, Barbero, Leticia, Byrne, Robert H., Cai, Wei-Jun, Chierici, Melissa, Clegg, Simon L., Easley, Regina A., Fassbender, Andrea J., Fleger, Kalla L., Li, Xinyu, Martín-Mayor, Macarena, Schockman ,Katelyn M., Wang, Zhaohui Aleck, National Science Foundation (US), National Aeronautics and Space Administration (US), National Oceanic and Atmospheric Administration (US), Commonwealth Scientific and Industrial Research Organisation (Australia), University of South Florida, Miami University, Agencia Estatal de Investigación (España), Cooperative Institute for Climate, Ocean, and Ecosystem Studies, Cooperative Institute For Marine And Atmospheric Studies (US), Carter, Brendan R., Sharp, Jonathan D., Dickson, Andrew G., Álvarez-Rodríguez, Marta, Fong, Michael B., García-Ibáñez, Maribel I., Woosley, Ryan J., Takeshita, Yuichiro, Barbero, Leticia, Byrne, Robert H., Cai, Wei-Jun, Chierici, Melissa, Clegg, Simon L., Easley, Regina A., Fassbender, Andrea J., Fleger, Kalla L., Li, Xinyu, Martín-Mayor, Macarena, Schockman ,Katelyn M., and Wang, Zhaohui Aleck
- Abstract
The ocean carbonate system is critical to monitor because it plays a major role in regulating Earth's climate and marine ecosystems. It is monitored using a variety of measurements, and it is commonly understood that all components of seawater carbonate chemistry can be calculated when at least two carbonate system variables are measured. However, several recent studies have highlighted systematic discrepancies between calculated and directly measured carbonate chemistry variables and these discrepancies have large implications for efforts to measure and quantify the changing ocean carbon cycle. Given this, the Ocean Carbonate System Intercomparison Forum (OCSIF) was formed as a working group through the Ocean Carbon and Biogeochemistry program to coordinate and recommend research to quantify and/or reduce uncertainties and disagreements in measurable seawater carbonate system measurements and calculations, identify unknown or overlooked sources of these uncertainties, and provide recommendations for making progress on community efforts despite these uncertainties. With this paper we aim to (1) summarize recent progress toward quantifying and reducing carbonate system uncertainties; (2) advocate for research to further reduce and better quantify carbonate system measurement uncertainties; (3) present a small amount of new data, metadata, and analysis related to uncertainties in carbonate system measurements; and (4) restate and explain the rationales behind several OCSIF recommendations. We focus on open ocean carbonate chemistry, and caution that the considerations we discuss become further complicated in coastal, estuarine, and sedimentary environments
- Published
- 2024
6. Usefulness of Combined Measurement of Surfactant Protein D, Thrombin–Antithrombin III Complex, D-Dimer, and Plasmin–α2 Plasmin Inhibitor Complex in Acute Exacerbation of Interstitial Lung Disease: A Retrospective Cohort Study.
- Author
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Takeshita, Yuichiro, To, Masako, Kurosawa, Yusuke, Furusho, Naho, Kinouchi, Toru, Tsushima, Kenji, Tada, Yuji, To, Yasuo, and Sakao, Seiichiro
- Subjects
- *
PULMONARY surfactant-associated protein D , *INTERSTITIAL lung diseases , *DISSEMINATED intravascular coagulation , *FIBRIN fragment D , *DISEASE exacerbation , *PLASMIN - Abstract
Background/Objectives: The coagulation cascade due to tissue damage is considered to be one of the causes of poor prognostic outcomes in patients with acute exacerbations of interstitial lung disease (AE-ILD). This study aimed to confirm coagulopathy in AE-ILD by evaluating the differences in the clinical characteristics of coagulation/fibrinolysis markers between stable ILD and AE-ILD. Methods: Overall, 81 patients were enrolled in this retrospective study and categorized into the following two groups: a chronic ILD group comprising 63 outpatients and an acute ILD group comprising 18 inpatients diagnosed with AE-ILD. Serum markers, including thrombin–antithrombin III complex (TAT), D-dimer, plasmin–α2 plasmin inhibitor complex (PIC), and surfactant protein D (SP-D), were compared between the groups. Results: Among the 18 patients with acute ILD, 17 did not meet the International Society of Thrombosis and Hemostasis scoring system for disseminated intravascular coagulation. In acute ILD, the SP-D levels were statistically significantly positively correlated with TAT, D-dimer, and PIC levels, while the Krebs von den Lungen 6 (KL-6) levels showed no correlation with any of these coagulation/fibrinolytic markers. A positive correlation was observed between SP-D levels and TAT, D-dimer, and PIC levels in acute ILD. Serum TAT, D-dimer, and PIC all showed good area under the receiver operating characteristic (ROC) curve (AUC) values in ROC analysis for the diagnosis of acute ILD. Conclusions: In the clinical setting of AE-ILD, it may be important to focus not only on alveolar damage markers such as SP-D but also on coagulation/fibrinolytic markers including TAT, D-dimer, and PIC. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
7. Uncertainty sources for measurable ocean carbonate chemistry variables.
- Author
-
Carter, Brendan R., Sharp, Jonathan D., Dickson, Andrew G., Álvarez, Marta, Fong, Michael B., García‐Ibáñez, Maribel I., Woosley, Ryan J., Takeshita, Yuichiro, Barbero, Leticia, Byrne, Robert H., Cai, Wei‐Jun, Chierici, Melissa, Clegg, Simon L., Easley, Regina A., Fassbender, Andrea J., Fleger, Kalla L., Li, Xinyu, Martín‐Mayor, Macarena, Schockman, Katelyn M., and Wang, Zhaohui Aleck
- Subjects
OCEAN ,MARINE ecology ,CARBONATE minerals ,CARBON cycle ,CARBONATES ,BIOGEOCHEMISTRY - Abstract
The ocean carbonate system is critical to monitor because it plays a major role in regulating Earth's climate and marine ecosystems. It is monitored using a variety of measurements, and it is commonly understood that all components of seawater carbonate chemistry can be calculated when at least two carbonate system variables are measured. However, several recent studies have highlighted systematic discrepancies between calculated and directly measured carbonate chemistry variables and these discrepancies have large implications for efforts to measure and quantify the changing ocean carbon cycle. Given this, the Ocean Carbonate System Intercomparison Forum (OCSIF) was formed as a working group through the Ocean Carbon and Biogeochemistry program to coordinate and recommend research to quantify and/or reduce uncertainties and disagreements in measurable seawater carbonate system measurements and calculations, identify unknown or overlooked sources of these uncertainties, and provide recommendations for making progress on community efforts despite these uncertainties. With this paper we aim to (1) summarize recent progress toward quantifying and reducing carbonate system uncertainties; (2) advocate for research to further reduce and better quantify carbonate system measurement uncertainties; (3) present a small amount of new data, metadata, and analysis related to uncertainties in carbonate system measurements; and (4) restate and explain the rationales behind several OCSIF recommendations. We focus on open ocean carbonate chemistry, and caution that the considerations we discuss become further complicated in coastal, estuarine, and sedimentary environments. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
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