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  • 1
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    Flow-through quantification of microplastics using impedance spectroscopy (2021)
    American Chemical Society
    Details
    Publication Date: 2022-10-21
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Colson, B. C., & Michel, A. P. M. Flow-through quantification of microplastics using impedance spectroscopy. ACS Sensors, 6(1), (2021): 238–244, doi:10.1021/acssensors.0c02223.
    Description: Understanding the sources, impacts, and fate of microplastics in the environment is critical for assessing the potential risks of these anthropogenic particles. However, our ability to quantify and identify microplastics in aquatic ecosystems is limited by the lack of rapid techniques that do not require visual sorting or preprocessing. Here, we demonstrate the use of impedance spectroscopy for high-throughput flow-through microplastic quantification, with the goal of rapid measurement of microplastic concentration and size. Impedance spectroscopy characterizes the electrical properties of individual particles directly in the flow of water, allowing for simultaneous sizing and material identification. To demonstrate the technique, spike and recovery experiments were conducted in tap water with 212–1000 μm polyethylene beads in six size ranges and a variety of similarly sized biological materials. Microplastics were reliably detected, sized, and differentiated from biological materials via their electrical properties at an average flow rate of 103 ± 8 mL/min. The recovery rate was ≥90% for microplastics in the 300–1000 μm size range, and the false positive rate for the misidentification of the biological material as plastic was 1%. Impedance spectroscopy allowed for the identification of microplastics directly in water without visual sorting or filtration, demonstrating its use for flow-through sensing.
    Description: The authors thank the Richard Saltonstall Charitable Foundation and the National Academies Keck Futures Initiative (NAKFI DBS13) for their funding support.
    Keywords: Microplastics ; Plastics ; Impedance spectroscopy ; Dielectric properties ; Instrumentation ; Particle detection ; Flow-through ; Environmental sensing
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 2
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    Production of two highly abundant 2-methyl-branched fatty acids by blooms of the globally significant marine cyanobacteria Trichodesmium erythraeum (2021)
    American Chemical Society
    Details
    Publication Date: 2022-05-27
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Gosselin, K. M., Nelson, R. K., Spivak, A. C., Sylva, S. P., Van Mooy, B. A. S., Aeppli, C., Sharpless, C. M., O’Neil, G. W., Arrington, E. C., Reddy, C. M., & Valentine, D. L. Production of two highly abundant 2-methyl-branched fatty acids by blooms of the globally significant marine cyanobacteria Trichodesmium erythraeum. ACS Omega, 6(35), (2021): 22803–22810, https://doi.org/10.1021/acsomega.1c03196.
    Description: The bloom-forming cyanobacteria Trichodesmium contribute up to 30% to the total fixed nitrogen in the global oceans and thereby drive substantial productivity. On an expedition in the Gulf of Mexico, we observed and sampled surface slicks, some of which included dense blooms of Trichodesmium erythraeum. These bloom samples contained abundant and atypical free fatty acids, identified here as 2-methyldecanoic acid and 2-methyldodecanoic acid. The high abundance and unusual branching pattern of these compounds suggest that they may play a specific role in this globally important organism.
    Description: This work was funded with grants from the National Science Foundation grants OCE-1333148, OCE-1333162, and OCE-1756254 and the Woods Hole Oceanographic Institution (IR&D). GCxGC analysis made possible by WHOI’s Investment in Science Fund.
    Keywords: Lipids ; Alkyls ; Bacteria ; Genetics ; Chromatography
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 3
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    Designing and establishment of ISO/IEC 17025:2005 international standard system in the Persian Gulf and Oman Sea Ecology Research Center laboratories (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25291 | 18721 | 2018-09-07 07:58:51 | 25291 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: This project was carried out from November 2008 for about two years. Seven laboratories of the research center including: Chromatography, Instrumental Analysis, Aquatic zoology, Sample preparation, Histology, Plankton and Benthos were selected for the accreditation. The quality manual of the test laboratories was written following the general requirements of ISO/IEC 17025. During the establishment of the system standardization of the test methods, calibration of the equipment, test methods validation, uncertainty estimation of measurement and update and improvement of physical conditions of the laboratories were performed. The technical and quality management competence of the laboratories were evaluated by the auditors from DGA (the German Accreditation System for Testing Laboratories), which is signatory of ILAC (International Laboratory Accreditation Co-operation). The laboratories officially accredited by DGA, after the successful completion of the accreditation process (including implementation of corrective actions for the detected nonconformities). The accreditation is valid from 2009-11-12 to 2014-11-11. Production of reliable results of the test methods from national and international scientific organizations' point of view as well as facilitation in development of bilateral and multilateral relations with them can be considered as the advantages of the system establishment. Moreover, exchange of the relevant scientific information and experiences among the researchers will be facilitated.
    Keywords: Information Management ; Iran ; Persian Gulf ; Oman Sea ; ISO 17025:2005 ; Testing Laboratories ; Calibration ; Accreditation ; Chromatography ; Instrumental Analysis ; Aquatic ; Plankton ; Benthos ; ISO 17025 ; ISO 2005
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 80
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  • 4
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    Extraction‚ purification, identification and amount verification of steroids in Sargassum glaucescens and Padina boergesni algae in Oman Sea (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25642 | 18721 | 2018-10-14 02:40:17 | 25642 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: Padina boergesenii is one of the most abundant brown algae distributed in the north of Persian Gulf and Oman Sea. In this study after sampling and preparation of Padina boergesenii by Chroform-Etanol (3-1) solvent and by Methanol has been extract. Separation and purification of the compounds was carried out using thin layer, general and inverse column chromatography, Cephadex and high-performance liquid chromatography (HPLC). Structural elucidation of the constituents was based on the data obtained from H-NMR, 13C-NMR, HSQC, HMBC, DEPT and Cephadex LH-20. The steroids compounds separated from above alga were identified as 22dehydrocholesterol (1), cholesterol (2), fucosterol (3), β-sitosterol (4), stigmasterol (5), ostreasterol (6) and two epimer of hyroxyestrol(7), based on their spectral data and from comparison with those previously reported in the literature.
    Keywords: Biology ; Chemistry ; Iran ; Oman Sea ; Persian Gulf ; Brown Algae ; Padina boergesenii ; Steroids compounds ; Extraction ; Purification ; Identification ; Amount verification ; Sargassum glaucescens ; Algae ; Abundant ; Sampling ; Chromatography ; Cephadex ; Dehydrocholesterol ; Cholesterol ; Fucosterol ; β-sitosterol ; Stigmasterol ; Ostreasterol
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 42
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  • 5
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    Designing and establishment of ISO / IEC 17025:2005 international standard system in the Persian Gulf and Oman Sea Ecology Research Center laboratories (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: This project was carried out from November 2008 for about two years. Seven laboratories of the research center including: Chromatography, Instrumental Analysis, Aquatic zoology, Sample preparation, Histology, Plankton and Benthos were selected for the accreditation. The quality manual of the test laboratories was written following the general requirements of ISO/IEC 17025. During the establishment of the system standardization of the test methods, calibration of the equipment, test methods validation, uncertainty estimation of measurement and update and improvement of physical conditions of the laboratories were performed. The technical and quality management competence of the laboratories were evaluated by the auditors from DGA (the German Accreditation System for Testing Laboratories), which is signatory of ILAC (International Laboratory Accreditation Co-operation). The laboratories officially accredited by DGA, after the successful completion of the accreditation process (including implementation of corrective actions for the detected nonconformities). The accreditation is valid from 2009-11-12 to 2014-11-11. Production of reliable results of the test methods from national and international scientific organizations' point of view as well as facilitation in development of bilateral and multilateral relations with them can be considered as the advantages of the system establishment. Moreover, exchange of the relevant scientific information and experiences among the researchers will be facilitated.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Ecology ; Histology ; Physical ; ISO 17025:2005 ; Testing Laboratories ; Calibration ; Accreditation ; Chromatography ; Instrumental Analysis ; Aquatic ; Plankton ; Benthos ; ISO 17025 ; ISO 2005
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 80pp.
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  • 6
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    Extraction‚ Purification, Identification and amount verification of Steroids, in Sargassum glaucescens and Padina boergesni algae in Oman Sea (2018)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    Details
    Publication Date: 2021-05-19
    Description: Padina boergesenii is one of the most abundant brown algae distributed in the north of Persian Gulf and Oman Sea. In this study after sampling and preparation of Padina boergesenii by Chroform-Etanol (3-1) solvent and by Methanol has been extract. Separation and purification of the compounds was carried out using thin layer, general and inverse column chromatography, Cephadex and high-performance liquid chromatography (HPLC). Structural elucidation of the constituents was based on the data obtained from H-NMR, 13C-NMR, HSQC, HMBC, DEPT and Cephadex LH-20. The steroids compounds separated from above alga were identified as 22dehydrocholesterol (1), cholesterol (2), fucosterol (3), β-sitosterol (4), stigmasterol (5), ostreasterol (6) and two epimer of hyroxyestrol(7), based on their spectral data and from comparison with those previously reported in the literature.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Brown Algae ; Padina boergesenii ; Steroids compounds ; Extraction ; Purification ; Identification ; Amount verification ; Sargassum glaucescens ; Algae ; Abundant ; Sampling ; Chromatography ; Cephadex ; Dehydrocholesterol ; Cholesterol ; Fucosterol ; β-sitosterol ; Stigmasterol ; Ostreasterol
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 42pp.
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  • 7
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    The boundary element method for stress concentrations and fracture problems (1986)
    Institute of Physics
    In:  Professional Paper, Boundary Element Methods. Theory and Application, Bristol, Institute of Physics, vol. 9, no. 16, pp. 1-23, (ISBN 1-4020-1729-4)
    Details
    Publication Date: 1986
    Keywords: Stress ; Rock mechanics ; Stress intensity factor ; Boundary Element Method ; Fracture ; ENDNOTE?
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    BIBLIOGRAPHY SEISMOLOGY
  • 8
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    Boundary Element Methods. Theory and Application (1986)
    Institute of Physics
    In:  Bristol, Institute of Physics, vol. 8, no. Publ. No. 12, pp. 95-104, (ISBN 0-865-42078-5)
    Details
    Publication Date: 1986
    Keywords: Rock mechanics ; Fracture ; Boundary Element Method ; Elasticity ; Dynamic
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    BIBLIOGRAPHY SEISMOLOGY
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