Relevant bibliographies by topics / Oxygen microsensor

Academic literature on the topic 'Oxygen microsensor'

Author: Grafiati
Published: 8 June 2024

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Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Journal articles on the topic "Oxygen microsensor":

1

Lee, Chi-Yuan, Chia-Hung Chen, Sheng-Ming Chuang, Chin-Yuan Yang, and Jia-Yu Hsu. "A Flexible 8-in-1 Microsensor Embedded in Proton Battery Stack for Real-Time Microscopic Measurements." Membranes 13, no. 6 (June 1, 2023): 573. http://dx.doi.org/10.3390/membranes13060573.

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According to the latest literature, it is difficult to measure the multiple important physical parameters inside a proton battery stack accurately and simultaneously. The present bottleneck is external or single measurements, and the multiple important physical parameters (oxygen, clamping pressure, hydrogen, voltage, current, temperature, flow, and humidity) are interrelated, and have a significant impact on the performance, life, and safety of the proton battery stack. Therefore, this study used micro-electro-mechanical systems (MEMS) technology to develop a micro oxygen sensor and a micro clamping pressure sensor, which were integrated into the 6-in-1 microsensor developed by this research team. In order to improve the output and operability of microsensors, an incremental mask was redesigned to integrate the back end of the microsensor in combination with a flexible printed circuit. Consequently, a flexible 8-in-1 (oxygen, clamping pressure, hydrogen, voltage, current, temperature, flow, and humidity) microsensor was developed and embedded in a proton battery stack for real-time microscopic measurement. Multiple micro-electro-mechanical systems technologies were used many times in the process of developing the flexible 8-in-1 microsensor in this study, including physical vapor deposition (PVD), lithography, lift-off, and wet etching. The substrate was a 50 μm-thick polyimide (PI) film, characterized by good tensile strength, high temperature resistance, and chemical resistance. The microsensor electrode used Au as the main electrode and Ti as the adhesion layer.
2

Rathnayake, Rathnayake M. L. D., Shogo Sugahara, Hideaki Maki, Gen Kanaya, Yasushi Seike, and Hisashi Satoh. "High spatial resolution analysis of the distribution of sulfate reduction and sulfide oxidation in hypoxic sediment in a eutrophic estuary." Water Science and Technology 75, no. 2 (November 23, 2016): 418–26. http://dx.doi.org/10.2166/wst.2016.516.

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Bottom hypoxia and consequential hydrogen sulfide (H2S) release from sediment in eutrophic estuaries is a major global environmental issue. We investigated dissolved oxygen, pH and H2S concentration profiles with microsensors and by sectioning sediment cores followed by colorimetric analysis. The results of these analyses were then compared with the physicochemical properties of the bottom water and sediment samples to determine their relationships with H2S production in sediment. High organic matter and fine particle composition of the sediment reduced the oxidation-reduction potential, stimulating H2S production. Use of a microsensor enabled measurement of H2S concentration profiles with submillimetre resolution, whereas the conventional sediment-sectioning method gave H2S measurements with a spatial resolution of 10 mm. Furthermore, microsensor measurements revealed H2S consumption occurring at the sediment surface in both the microbial mat and the sediment anoxic layer, which were not observed with sectioning. This H2S consumption prevented H2S release into the overlying water. However, the microsensor measurements had the potential to underestimate H2S concentrations. We propose that a combination of several techniques to measure microbial activity and determine its relationships with physicochemical properties of the sediment is essential to understanding the sulfur cycle under hypoxic conditions in eutrophic sediments.
3

Ring, Andrej, Heiko Sorg, Andreas Weltin, Daniel J. Tilkorn, Jochen Kieninger, Gerald Urban, and Jörg Hauser. "In-vivo monitoring of infection via implantable microsensors: a pilot study." Biomedical Engineering / Biomedizinische Technik 63, no. 4 (July 26, 2018): 421–26. http://dx.doi.org/10.1515/bmt-2016-0250.

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Abstract The most common complication after implantation of foreign material is infection, leading to implant failure and severe patient discomfort. Smoldering-infections proceed inapparently and might not get verified by radiological diagnostics. Early identification of this type of infection might significantly reduce the rate of complications. Therefore, we manufactured a microsensor strip in a hybrid of thin-film and laminate technology in a wafer-level process. It comprises electrochemical, amperometric microsensors for glucose, oxygen and lactate as well as an integrated reference electrode. Microsensors have been implanted in the mouse dorsal skin fold chamber, which got inoculated with a human-pathogen bacterial strain. A selective signal could be measured for all parameters and time points. The infection led to measurable changes of the wound environment as given by a decrease of the oxygen- as well as the glucose-concentration while the lactate concentration increased markedly over time. The given results in this study are the first hints on a promising new tool and should therefore be interpreted as a proof of the principle to show the functionality of the microsensors in an in vivo setting. These microsensors could be used to monitor smoldering infections of implantable foreign materials reducing foreign implant associated complications.
4

Fang, Yuxin, Di Zhang, Qing Xia, Shouhai Hong, Yuan Xu, and Yi Guo. "Fabrication of a Needle Microsensor and Its Applications in the Detection of Dissolved Oxygen." Journal of Sensors 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/408458.

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A novel needle microsensor measurement system was fabricated and applied to determine the concentration of dissolved oxygen. Platinum nanoparticles were employed to modify the surface of copper-core electrode in order to improve electrochemical response signal. The homemade electrode displayed efficient electrocatalytic reduction activity towards dissolved oxygen. The sensor responded linearly to dissolved oxygen in the range of 10 μM to 0.195 mM and had a remarkable sensitivity of 9.02 μA/mM. In addition, it showed an excellent reproducibility, stability, and selectivity. These results indicated that the needle microsensor when used, could yield good performance. Moreover, it is believed to be a potential tool for studying specific substances at a cellular level orin vivoin future.
5

Revsbech, Niels Peter. "An oxygen microsensor with a guard cathode." Limnology and Oceanography 34, no. 2 (March 1989): 474–78. http://dx.doi.org/10.4319/lo.1989.34.2.0474.

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6

Andersen, Knud, Thomas Kjær, and Niels Peter Revsbech. "An oxygen insensitive microsensor for nitrous oxide." Sensors and Actuators B: Chemical 81, no. 1 (December 2001): 42–48. http://dx.doi.org/10.1016/s0925-4005(01)00924-8.

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7

She, Didi, and Mark G. Allen. "A Self-Powered, Biodegradable Dissolved Oxygen Microsensor." Journal of Microelectromechanical Systems 29, no. 5 (October 2020): 1074–78. http://dx.doi.org/10.1109/jmems.2020.3013208.

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8

Hong, Minyoung, Sarah S. Park, Yejin Ha, Jaegeun Lee, Kwangsik Yoo, Gil-Ja Jhon, Minah Suh, and Youngmi Lee. "Heterogeneity of Skin Surface Oxygen Level of Wrist in Relation to Acupuncture Point." Evidence-Based Complementary and Alternative Medicine 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/106762.

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The distribution of partial oxygen pressure (pO2) is analyzed for the anterior aspect of the left wrist with an amperometric oxygen microsensor composed of a small planar Pt disk-sensing area (diameter = 25 μm). The pO2levels vary depending on the measurement location over the wrist skin, and they are systematically monitored in the analysis for both one-dimensional single line (along the wrist transverse crease) and two-dimensional square area of the wrist region. Relatively higher pO2values are observed at certain area in close proximity to the position of acupuncture points with statistical significance, indicating strong relationship between oxygen and acupuncture point. The used oxygen microsensor is sensitive enough to detect the pO2variation depending on the location. This study may provide information helpful to understand possible physiological roles of the acupuncture points.
9

Tan, Shuying, Tong Yu, and Han-chang Shi. "Microsensor determination of multiple microbial processes in an oxygen-based membrane aerated biofilm." Water Science and Technology 69, no. 5 (December 14, 2013): 909–14. http://dx.doi.org/10.2166/wst.2013.730.

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Microsensor techniques were used to investigate in situ the simultaneous occurrence of sulfate reduction and nitrogen removal in a membrane aerated biofilm reactor. H2S, O2, pH, ORP, NH4+ and NO3− microsensors were fabricated and used to measure the profiles inside the membrane aerated biofilm. Production and consumption rates of H2S, O2, NH4+ and NO3− were estimated using corresponding concentration profiles. The results showed that in anoxic zone, located from the interface between biofilm and bulk liquid to about 550 μm below the interface, both sulfate reduction and denitrification occurred. Highest H2S production rates (around 0.27 mg L−1s−1) were found about 400 to 450 μm below the interface. Below the anoxic zone, an aerobic zone was present. High H2S oxidation activity occurred at around 550–700 μm below the interface. High oxygen consumption rates (0.34 mg L−1s−1) occurred at around 750–900 μm below the interface. Nitrification activity occurred at about 500–650 μm below the interface. Along the entire biofilm depth, pH changed slightly (within 0.2 unit). Near the interface of the aerobic and anoxic zone, there was a drastic redox potential change. These results demonstrated simultaneous sulfate reduction and nitrogen removal in a piece of membrane aerated biofilm.
10

Cronenberg, Carel, Bert van Groen, Dirk de Beer, and Han van den Heuvel. "Oxygen-independent glucose microsensor based on glucose oxidase." Analytica Chimica Acta 242 (1991): 275–78. http://dx.doi.org/10.1016/0003-2670(91)87075-i.

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Journal articles

Dissertations / Theses on the topic "Oxygen microsensor":

1

Meresse, Marvin. "Dynamique des mécanismes de production microphytobenthique intertidale estuarienne au regard des forçages naturels." Electronic Thesis or Diss., Université de Lille (2022-....), 2023. https://pepite-depot.univ-lille.fr/ToutIDP/EDSMRE/2023/2023ULILR076.pdf.

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À l'interface entre terre et mer, les estuaires revêtent une importance majeure pour la biodiversité marine. Au cœur de ces écosystèmes estuariens, le microphytobenthos intertidal occupe une place clé au sein du réseau trophique de ces environnements. Ce biofilm intertidal, composé principalement de microalgues, contribue de manière significative à l'activité biogéochimique caractéristique des milieux estuariens en termes de fonctionnement et de bilan de production.C'est autour de la production primaire du microphytobenthos et des mécanismes associés que s'articulent plusieurs études qui composent cette thèse de doctorat. Pour caractériser l'influence des forçages sur la production primaire microphytobenthique, le développement méthodologique d'une enceinte de mesures en laboratoire a été réalisé afin de standardiser, en conditions contrôlées, l'acquisition des mesures de la photophysiologie et du comportement migratoire des microalgues qui composent le biofilm. En utilisant cette méthodologie, nous avons examiné expérimentalement la production primaire ainsi que les réponses migratoires du microphytobenthos de l'estuaire de la Canche, en nous concentrant sur la variabilité des mécanismes à l'échelle journalière. Cette approche a révélé la capacité du microphytobenthos à maintenir pendant plusieurs jours un niveau de production et un rythme de migration synchronisé avec les cycles marégraphiques et nycthéméraux observés sur le site d'étude.La variabilité spatio-temporelle de la réponse du microphytobenthos de l'estuaire de la Canche a également été appréhendée suivant un transect amont-aval en considérant deux hauteurs bathymétriques distinctes et deux périodes de l'année dont les caractéristiques physico-chimiques sont contrastées. Cette dernière étude a mis en évidence l'influence multifactorielle des conditions physico-chimiques de l'environnement estuarien sur la photophysiologie et l'activité migratoire du microphytobenthos. Un effet temporel a été identifié avec une augmentation de la production primaire entre avant et après le bloom printanier, et ce, sur l'ensemble des stations étudiées. De plus, cette étude a montré que l'intrusion d'eau de mer provoque une spatialisation suivant un gradient amont-aval de la production primaire, qui s'est avérée être plus forte à l'embouchure de l'estuaire et plus faible dans la zone de désalure pour les vasières. Sur les plus hauts niveaux bathymétriques, correspondant à la zone de pré-salés, un patron de distribution inverse a pu être observé. Cette différence s'explique par l'effet tampon de la canopée de la végétation, qui entraine une plus grande stabilité des paramétres physico-chimiques et permet une production primaire et une activité migratoire identiques avant et après le bloom printanier
At the interface between land and sea, estuaries hold major importance for marine biodiversity. At the core of these estuarine ecosystems, intertidal microphytobenthos plays a key role within the trophic network of these environments. This intertidal biofilm, primarily composed of microalgae, significantly contributes to the biogeochemical activity of estuarine habitats in terms of functioning and budget.Several studies comprising this doctoral thesis focus on the primary production of microphytobenthos and its associated mechanisms. In order to characterize the environmental influences on microphytobenthic primary production, a methodological development was undertaken in the laboratory to standardize the acquisition of measurements related to the photophysiology and migratory behavior of the microalgae composing the biofilm. Using this methodology, we experimentally studied the primary production and migratory responses of the microphytobenthos in the Canche estuary, with a focus on the variability at a daily scale. This approach unveiled the microphytobenthos' capacity to maintain a rhythm of primary production and migration over several days, synchronized with the observed tidal and diurnal cycles at the study site.The spatiotemporal variability of the microphytobenthos' response in the Canche estuary was investigated along an upstream-downstream transect, considering two distinct bathymetric heights and two periods of the year characterized by contrasting physicochemical conditions. The latest study has highlighted the multifactorial influence of physicochemical conditions in the estuarine environment on the microphytobenthic photophysiology and migratory behavior. A temporal effect was identified, with an increase in primary production between before and after the spring bloom, at all the studied stations. In addition, this study showed that seawater intrusion causes a spatialization of primary production along an upstream-downstream gradient, which was found to be stronger at the estuary mouth and weaker in the mudflat desalination zone. At higher bathymetric levels, corresponding to the salt marsh zone, an inverse distribution pattern was observed. This difference can be explained by the buffering effect of the vegetation canopy, which results in greater stability of physico-chemical parameters and enables identical primary production and migratory activity before and after the spring bloom
2

Francou, Mireille. "EEtude de la gravure profonde du silicium dans un réacteur haute-densité micro-onde de type propagatif." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10090.

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Dans le domaine des microtechnologies, la realisation de microcapteurs necessite la maitrise de procedes d'usinage en volume du silicium. La gravure humide, couramment utilisee connait aujourd'hui des limitations dues principalement a la difficulte de realisation de geometries particulieres. La gravure par plasma s'avere donc interessante pour outrepasser ces limitations, car elle devrait permettre une plus grande liberte quand aux geometries obtenues. Les recherches entreprises en gravure seche ont porte essentiellement sur l'optimisation de procedes pour des applications micro-electroniques. Pour une application microtechnologique, cela suppose la mise au point de procede de gravure profonde superieure a 10 microns. Le travail presente ici porte sur la mise au point d'un procede de gravure profonde du silicium par plasma, en associant l'action d'une chimie non polymerisante (sf#6, ar, o#2) conduisant a la formation d'une couche bloquante sur les flancs des tranchees, a un refroidissement a basse temperature du substrat. L'etude a ete realisee dans un reacteur surfaguide haute densite permettant de dissocier la fonction de creation de la decharge de la fonction d'acceleration des especes ionisees. Le substrat est maintenu par clampage mecanique avec injection d'helium en face arriere et refroidi par azote liquide. Dans une premiere partie, l'etude parametrique a conduit a la mise au point d'un procede de gravure anisotrope. Elle a mis en evidence que les deux parametres determinants etaient la temperature du substrat et la concentration en oxygene. Une deuxieme partie a ete consacree au choix d'un procede de gravure resultant de l'etude parametrique et de son optimisation a des profondeurs superieures a 20 microns. A travers cette etude, nous nous sommes interesses aux limites du procede telles que la profondeur de saturation, la degradation des motifs et les rugosites de surface
3

Chen, Ren-He, and 陳仁和. "Study of Extended-gate FET-based Dissolved Oxygen Microsensor." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/35847814733946304928.

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Abstract:
碩士
國立中山大學
電機工程學系研究所
100
Water resource is one of the most important natural resources on earth. In recent years, due to the discharges of large industrial and domestic waste-water into the nature, water pollution problem is getting more and more serious and how to monitor the quality of water in real time has become a very important research issue. The dissolved oxygen is one of the critical indexes for evaluating the quality of water. Although the conventional dissolved oxygen detectors presented a high sensitivity and high accuracy, the high cost, large dimension, low capability of batch fabrication and real-time monitoring will limit their applications. In this thesis, an extended-gate field-effect transistor (EGFET) based dissolved oxygen microsensor is developed utilizing micro-electromechanical system (MEMS) technology. The gate voltages of EGFET under different concentrations of dissolved oxygen can be detected by the Cr/Au sensing electrode. To further enhance the sensitivity of the proposed microsensor, a polystyrene layer with very high permeation rate of the dissolved oxygen gas is adopted and coated on the surface of Cr/Au layer. The main processing steps of the presented microsensor involve four photolithographic and four thin-film deposition processes. The influence of the channel’s width/length ratio, source/drain geometry and polystyrene additional layer on the sensitivity of the EGFET based dissolved oxygen microsensor are investigated in this study. The chip size of the implemented dissolved oxygen microsensor is 11 mm×13 mm× 0.5 mm and the sensing area is 1 mm×1 mm. As the dissolved oxygen concentration varies from 2 ppm to 6 ppm, a very high sensitivity (35.36 mV/ppm) and sensing linearity (98.83%) of the proposed EGFET microsensor can be demonstrated. In addition, the response time of the presented dissolved oxygen microsensor is only about III 180~200 seconds, hence it is very suitable for developing a real-time monitoring microsystem.

Books on the topic "Oxygen microsensor":

1

Hooijmans, C. M. Diffusion coupled with bioconversion in immobilized systems: Use of an oxygen microsensor. Amsterdam: Thesis Publishers, 1990.

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2

National Aeronautics and Space Administration (NASA) Staff. Development of a Self-Calibrating Dissolved Oxygen Microsensor Array for the Monitoring and Control of Plant Growth in a Space Environment. Independently Published, 2018.

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Book chapters on the topic "Oxygen microsensor":

1

Liday, Denson, Nobelyn Agapito, and Samuel Dulay. "Development of Electrochemical Oxygen Microsensor for the Measurement of Dissolved Oxygen in Natural Waters." In Advancing Sustainable Science and Technology for a Resilient Future, 145–48. London: CRC Press, 2024. http://dx.doi.org/10.1201/9781003490210-33.

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2

Pathak, Pradeep Kumar, and Kapuganti Jagadis Gupta. "Using an Oxygen Microsensor to Measure Oxygen Dynamics in Tomato Plants in Response to Pseudomonas syringae Infection." In Methods in Molecular Biology, 63–69. New York, NY: Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-7292-0_7.

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3

Zilberstein, J., Y. Salomon, A. Scherz, and A. Bromberg. "Direct and Continuous Measurements of Oxygen Partial Pressure Using a Tissue-Inserted Optical Oxygen Microsensor: During Photodynamic Therapy." In Novel Approaches in Biosensors and Rapid Diagnostic Assays, 273–84. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-1231-8_20.

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4

de Beer, Dirk. "Microsensor Studies of Oxygen, Carbon, and Nitrogen Cycles in Lake Sediments and Microbial Mats." In Environmental Electrochemistry, 227–46. Washington, DC: American Chemical Society, 2002. http://dx.doi.org/10.1021/bk-2002-0811.ch012.

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5

Pandey, Sonika, Aprajita Kumari, Chellapilla Bharadwaj, and Kapuganti Jagadis Gupta. "Measurement of Respiration and Internal Oxygen in Germinating Cicer arietinum L. Seeds Using Optic Microsensor." In Methods in Molecular Biology, 57–62. New York, NY: Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-7292-0_6.

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Pennings, F. A., Gerrit J. Bouma, M. Kedaria, and G. Jansen. "Intraoperative Monitoring of Brain Tissue Oxygen and Carbon Dioxide Pressure in Peritumoural Oedema by Stereotactic Placement of Multiparameter Microsensors." In Intracranial Pressure and Brain Biochemical Monitoring, 323–25. Vienna: Springer Vienna, 2002. http://dx.doi.org/10.1007/978-3-7091-6738-0_82.

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Tschiersch, Henning, Gregor Liebsch, Achim Stangelmayer, Ljudmilla Borisjuk, and Hardy Rolletschek. "Planar Oxygen Sensors for Non Invasive Imaging in Experimental Biology." In Microsensors. InTech, 2011. http://dx.doi.org/10.5772/17893.

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Conference papers on the topic "Oxygen microsensor":

1

Nomaru, Juntaro, Taisuke Masuda, Satoshi Amaya, Shiro Watanabe, and Fumihito Arai. "Needle-Type Oxygen Microsensor Made by Hybrid 3D Microfabrication." In 2024 IEEE 37th International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2024. http://dx.doi.org/10.1109/mems58180.2024.10439499.

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2

Kieninger, J., F. Liebisch, A. Weltin, J. Marzioch, and G. A. Urban. "Zero consumption clark-type oxygen microsensor for cell culture monitoring." In 2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS). IEEE, 2017. http://dx.doi.org/10.1109/transducers.2017.7994343.

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Nosrati, Mehdi, Daniela Vieira, Edward J. Harvey, Geraldine E. Merle, and Sharmistha Bhadra. "Development of a Clark Microsensor for Low Concentration Dissolved Oxygen Monitoring." In 2020 IEEE International Instrumentation and Measurement Technology Conference (I2MTC). IEEE, 2020. http://dx.doi.org/10.1109/i2mtc43012.2020.9129243.

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Sandison, Mairi E., and Jonathan M. Cooper. "Optimisation of an Electrochemical Dissolved Oxygen Microsensor for an Environmental Monitoring System." In Proceedings of the International Workshop on New Developments. WORLD SCIENTIFIC, 2003. http://dx.doi.org/10.1142/9789812704306_0036.

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Chaturvedi, P., B. A. Hauser, L. H. Allen, K. J. Boote, E. Karplus, and E. S. McLamore. "A multiplexing fiber optic microsensor system for monitoring oxygen concentration in plants." In SPIE Defense, Security, and Sensing, edited by Brian M. Cullum and Eric S. McLamore. SPIE, 2013. http://dx.doi.org/10.1117/12.2015851.

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Marzioch, Julia, Jochen Kieninger, Andreas Weltin, and Gerald A. Urban. "Oxygen Microsensor Array to Study Spatial Efficacy of Photodynamic Therapy in Vitro." In 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII). IEEE, 2019. http://dx.doi.org/10.1109/transducers.2019.8808642.

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Wang, J. F., C. Bian, J. H. Tong, J. Z. Sun, Y. Li, H. Zhang, and S. H. Xia. "A biological/electrochemical reservoirs integrated microsensor for the determination of biochemical oxygen demand." In 2013 Transducers & Eurosensors XXVII: The 17th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS & EUROSENSORS XXVII). IEEE, 2013. http://dx.doi.org/10.1109/transducers.2013.6627215.

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Xu, Weiya, Wentao Ma, Kaiyang Li, Jiming Hu, Hongyi Li, Lianxin Cao, Yu Song, and Lan Zhao. "Novel needle-electrochemical microsensor for in-vitro and in-vivo measurements of oxygen." In International Conference on Sensing units and Sensor Technology, edited by Yikai Zhou and Shunqing Xu. SPIE, 2001. http://dx.doi.org/10.1117/12.440160.

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Flamm, H., A. Weltin, J. Kieninger, and G. A. Urban. "Measurement of reactive oxygen species release from stimulated cell culture with fully integrated microsensor system by advanced electrochemical detection principle." In TRANSDUCERS 2015 - 2015 18th International Solid-State Sensors, Actuators and Microsystems Conference. IEEE, 2015. http://dx.doi.org/10.1109/transducers.2015.7181236.

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Murphy, Thomas E., and Halil Berberog˘lu. "Cellular Photosynthetic Rate of Fully and Partially Pigmented Chlamydomonas reinhardtii as a Function of Irradiance." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64550.

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This paper reports the cellular photosynthetic rates of the green algae Chlamydomonas reinhardtii wild strain and its truncated chlorophyll antenna transformant, tla1, as a function of local irradiance. It is hypothesized that reduction in the pigmentation of algae cells can enhance light peneration in mass cultures and increase productivity. Thus, an experimental setup was designed to expose each cell within planktonic algae cultures to a nearly uniform irradiance. An oxygen microsensor was used to monitor the photosynthetic rate as the irradiance onto the sample was varied. The results showed that the cellular photosynthetic rate of the wild strain, CC125, was greater than that of tla1 at all irradiances, by a factor that ranged from 1.7 to 4. Photoinhibition was observed in both strains, although the effect was more pronounced in CC125. Although less pigmented cells enable deeper light penetration in photobioreactors, their reduced phosotynthetic rate can negate this benefit.

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