{"id":{"repo_id":"mit","oai_identifier":"oai:dspace.mit.edu:1721.1/41544"},"canonical_url":"https://search.dev.ndltd.org/etd/mit/oai:dspace.mit.edu:1721.1/41544","repository":{"repo_id":"mit","name":"MIT","base_url":"https://dspace.mit.edu/oai/request"},"display":{"title":"Selective microorganism concentration using a dielectrophoresis-based microfabricated device","abstract":"Detection of pathogenic microorganisms is a significant challenge in medicine, environmental protection and biological threat safety because samples are often contaminated. This work presents a method of separating bacterial spores from typical air contaminants such as sand or soot by means of dielectrophoresis. Spores of B. subtilis as well as model airborne interferents are characterized electrically; based on their properties, schemes of their electrical separation are proposed. The separation based on the frequency of applied electric field is implemented using microfabricated chips. To relate the data obtained from these microtools to particle concentration, a computer program is designed, implemented and validated. Experiments show that separation of bacterial spores from soot and sand suspended in water based on electrical properties of particles is possible and may serve as a way of enhancing spore concentration in mixtures.","abstract_html":"Detection of pathogenic microorganisms is a significant challenge in medicine, environmental protection and biological threat safety because samples are often contaminated. This work presents a method of separating bacterial spores from typical air contaminants such as sand or soot by means of dielectrophoresis. Spores of B. subtilis as well as model airborne interferents are characterized electrically; based on their properties, schemes of their electrical separation are proposed. The separation based on the frequency of applied electric field is implemented using microfabricated chips. To relate the data obtained from these microtools to particle concentration, a computer program is designed, implemented and validated. Experiments show that separation of bacterial spores from soot and sand suspended in water based on electrical properties of particles is possible and may serve as a way of enhancing spore concentration in mixtures.","abstract_has_math":false,"creators":["Puchała, Katarzyna Anna"],"institution":"Massachusetts Institute of Technology","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":"Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.","school":null,"contributors":[],"advisors":["Joel Voldman."],"committee_chairs":[],"committee_members":[],"year":2007,"date_issued":"2007","date_published":"2007","updated_at":"2026-07-22T22:20:59Z","subjects":["Electrical Engineering and Computer Science."],"languages":["eng"],"rights":["M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission."],"rights_urls":["http://dspace.mit.edu/handle/1721.1/7582"],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/1721.1/41544","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Joel Voldman."]},{"key":"dc:contributor.department","label":"Department","values":["Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science."]},{"key":"dc:contributor.other","label":"Dc Contributor Other","values":["Massachusetts Institute of Technology. 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The certified thesis is available in the Institute Archives and Special Collections.","\"February 2007.\"","Includes bibliographical references (leaves 54-55)."]},{"key":"dc:description.abstract","label":"Abstract","values":["Detection of pathogenic microorganisms is a significant challenge in medicine, environmental protection and biological threat safety because samples are often contaminated. This work presents a method of separating bacterial spores from typical air contaminants such as sand or soot by means of dielectrophoresis. Spores of B. subtilis as well as model airborne interferents are characterized electrically; based on their properties, schemes of their electrical separation are proposed. The separation based on the frequency of applied electric field is implemented using microfabricated chips. To relate the data obtained from these microtools to particle concentration, a computer program is designed, implemented and validated. Experiments show that separation of bacterial spores from soot and sand suspended in water based on electrical properties of particles is possible and may serve as a way of enhancing spore concentration in mixtures."]},{"key":"dc:description.degree","label":"Dc Description Degree","values":["M.Eng."]},{"key":"dc:title","label":"Title","values":["Selective microorganism concentration using a dielectrophoresis-based microfabricated device"]}]}],"canonical_facts":{"dc:contributor.advisor":["Joel Voldman."],"dc:contributor.department":["Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science."],"dc:contributor.other":["Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science."],"dc:creator":["Puchała, Katarzyna Anna"],"dc:date.accessioned":["2008-05-19T14:58:55Z"],"dc:date.available":["2008-05-19T14:58:55Z"],"dc:date.issued":["2007"],"dc:description":["Thesis (M. 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