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Optimering av analysmetoden hos koldioxid-isotop-analysatorn, Picarro-G2131-i
Linnaeus University, Faculty of Health and Life Sciences, Department of Chemistry and Biomedical Sciences.
2015 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Marine bacteria are microscopically visible organisms that can survive in most of the marine environments. Their function is to decompose dead organic matter, and thus contribute to the carbon cycle in the oceans. They utilizes dissolved organic matter in the oceans and produce carbon dioxide through respiration. This carbon dioxide can be measured with modern instruments to determine the primary production of the ecosystem and determine what carbon sources are responsible for the energy flow in the ecosystem. During this study, the possibility, advisability and the sensitivity of measuring bacterial respiration with the carbon dioxide isotope analyzer Picarro-G2131-i was examined. Further, the method was developed. For the experiment, two species of proteorhodopsin containing marine bacteria Polaribacter sp. strain MED152 and Dokdonia sp. strain MED134 were used. Growth and respiration of the bacteria were studied in nutrient rich medium. To test the Picarro-instrument is sensitivity, the respiration of both bacterial species was performed in respectively dilution series. In addition, the growth and respiration of MED134 in nutrient-poor conditions in light and darkness condition was compared. To study the impact of light on the growth of bacteria. No significant difference was found between MED134´s growth and respiration in light and dark. The method could be improved by modification such as changing pump, shorten tubes, remove a safety bottle and use a refefence bottle.

 

Conclusion

The carbon dioxide isotope analyzer Picarro-G2131-i is a sensitive instrument and can detect both the 12CO2 and 13CO2. According to the growth experiment, the bacteria grow very rapidly in nutrient rich medium. For comparing bacterial growth in light and dark, the correct light intensity and sufficient nutrient must be used.

Place, publisher, year, edition, pages
2015. , 24 p.
Keyword [sv]
Respiration, Polaribacter sp. stam MED 152, Dokdonia sp. stam MED 134, Proteorhodopsin. Koldioxid-isotop-mätning
National Category
Biomedical Laboratory Science/Technology
Identifiers
URN: urn:nbn:se:lnu:diva-45204OAI: oai:DiVA.org:lnu-45204DiVA: diva2:828169
Subject / course
Biomedical Sciences
Educational program
Biomedical Laboratory Science Programme, 180 credits
Supervisors
Examiners
Available from: 2015-08-04 Created: 2015-06-29 Last updated: 2015-08-04Bibliographically approved

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf