Document Detail


A bacterial culture-independent method to investigate chemically mediated control of bacterial epibiosis in marine invertebrates by using TRFLP analysis and natural bacterial populations.
MedLine Citation:
PMID:  19712350     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
It has been postulated that a variety of physically undefended marine invertebrates have evolved strategies to control microbial epibiosis chemically. Ecologically meaningful experiments that demonstrate chemically mediated antibacterial effects are difficult due to the small number of cultivable bacteria. Based on the example of three sponges, this study introduces a culture-independent methodology to investigate chemically mediated control of bacterial epibiosis by analyzing the natural bacterial consortia. Organic extracts of sponges were immobilized in hydrogels at tissue level concentrations and exposed to the same source of natural seawater for bacterial colonization. Terminal restriction fragment length polymorphism analysis of polymerase chain reaction-amplified bacterial community DNA obtained from these gels was shown to be a useful tool to study bacterial community shifts in response to sponge metabolites by comparing bacterial ribotypes obtained from the gel surfaces. Several terminal restriction fragments were absent relative to the control suggesting that settlement of specific bacteria was prevented. On the other hand, additional fragments occurred in some treatments, coinciding with higher bacterial abundance evidenced by DAPI counts of bacterial cells, indicating the bacterial utilization of sponge extract components. The advantages of this method are (1) a culture-independent approach, i.e. the assessment of antimicrobial activities against natural bacterial communities, (2) no restriction to particular modes of microbial colonization, i.e. antibiotic and repellant, and (3) the in situ assessment of antimicrobial compounds under flow conditions.
Authors:
Tilmann Harder; Stanley Chun Kwan Lau; Wai-Yee Tam; Pei-Yuan Qian
Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  FEMS microbiology ecology     Volume:  47     ISSN:  1574-6941     ISO Abbreviation:  FEMS Microbiol. Ecol.     Publication Date:  2004 Jan 
Date Detail:
Created Date:  2009-08-28     Completed Date:  2009-09-29     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8901229     Medline TA:  FEMS Microbiol Ecol     Country:  England    
Other Details:
Languages:  eng     Pagination:  93-9     Citation Subset:  IM    
Affiliation:
Institute for Chemistry and Biology of the Marine Environment, Carl von Ossietzky University, Oldenburg, Germany.
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MeSH Terms
Descriptor/Qualifier:
Animals
Anti-Bacterial Agents / pharmacology*
Bacteria* / classification,  genetics,  growth & development,  isolation & purification
Bacterial Adhesion
Cells, Immobilized*
Ecosystem*
Hydrogels
Invertebrates / chemistry,  microbiology
Marine Biology
Microbial Sensitivity Tests
Polymerase Chain Reaction
Polymorphism, Restriction Fragment Length*
Porifera / chemistry*,  microbiology*
Chemical
Reg. No./Substance:
0/Anti-Bacterial Agents; 0/Hydrogels

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


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