Document Detail


Surface shear rheological studies of marine phytoplankton cultures-Nitzschia closterium, Thalassiosira rotula, Thalassiosira punctigera and Phaeocystis sp.
MedLine Citation:
PMID:  16387477     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The study of interfacial properties in the marine environment is important for the understanding of air-sea gas exchange processes, especially with respect to the behaviour of entrained air bubbles. Seawater contains surfactant material, much of which is thought to origin from the exudation of dissolved organic material (DOM) by phytoplankton. This study aims at investigating the influence of different phytoplankton species on the surface shear viscosity of an air-water interface. Measurements of surface shear viscosity were carried out with the ISR1 interfacial shear rheometer. Surface shear viscosities of stock cultures of Phaeocystis sp., Thalassiosira rotula, Thalassiosira punctigera and Nitzschia closterium as well as of F/2 nutrient medium and seawater were measured. The surface shear viscosity of N. closterium was investigated during different stages of its growth as well as for an unfiltered stock culture sample and its filtrate. Results reveal that the influence of phytoplankton on the surface shear viscosity is species specific. An increase in surface shear viscosity occurred for the N. closterium stock culture only. The remaining cultures showed similar behaviour to F/2 nutrient medium. The increase of surface shear viscosity during the growth of N. closterium occurred mainly during the exponential growth phase. The increases in surface shear viscosity depend on the presence of phytoplankton cells in the sample. The formation of compact mechanical structures at the air-water interface originating from the aggregation of DOM released by N. closterium as a cause for the observed increases in surface shear viscosity is discussed.
Authors:
Verena Kuhnhenn; Jürgen Krägel; Ulrich Horstmann; Reinhard Miller
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-01-04
Journal Detail:
Title:  Colloids and surfaces. B, Biointerfaces     Volume:  47     ISSN:  0927-7765     ISO Abbreviation:  Colloids Surf B Biointerfaces     Publication Date:  2006 Jan 
Date Detail:
Created Date:  2006-01-23     Completed Date:  2006-04-17     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  9315133     Medline TA:  Colloids Surf B Biointerfaces     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  29-35     Citation Subset:  IM    
Affiliation:
Leibniz-Institut für Meereswissenschaften, Düsternbrooker Weg 20, Kiel 24105, Germany. vkuhnhenn@ifm-geomar.de
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MeSH Terms
Descriptor/Qualifier:
Air
Animals
Diatoms / chemistry*,  metabolism
Eukaryota
Marine Biology*
Phytoplankton / chemistry*,  metabolism
Rheology
Viscosity
Water / chemistry
Chemical
Reg. No./Substance:
7732-18-5/Water

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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