Silicifying Biofilm Exopolymers on a Hot-Spring Microstromatolite: Templating Nanometer-Thick Laminae

Show simple item record

dc.contributor.author Handley, Kim en
dc.contributor.author Turner, Susan en
dc.contributor.author Campbell, Kathleen en
dc.contributor.author Mountain, BW en
dc.date.accessioned 2012-04-02T21:26:14Z en
dc.date.issued 2008-08 en
dc.identifier.citation ASTROBIOLOGY 8(4):747-770 01 Aug 2008 en
dc.identifier.issn 1531-1074 en
dc.identifier.uri http://hdl.handle.net/2292/16455 en
dc.description.abstract Exopolymeric substances (EPS) are an integral component of microbial biofilms; however, few studies have addressed their silicification and preservation in hot-spring deposits. Through comparative analyses with the use of a range of microscopy techniques, we identified abundant EPS significant to the textural development of spicular, microstromatolitic, siliceous sinter at Champagne Pool, Waiotapu, New Zealand. Examination of biofilms coating sinter surfaces by confocal laser scanning microscopy (CLSM), environmental scanning electron microscopy (ESEM), cryo-scanning electron microscopy (cryo-SEM), and transmission electron microscopy (TEM) revealed contraction of the gelatinous EPS matrix into films (approximately 10 nm thick) or fibrillar structures, which is common in conventional SEM analyses and analogous to products of naturally occurring desiccation. Silicification of fibrillar EPS contributed to the formation of filamentous sinter. Matrix surfaces or dehydrated films templated sinter laminae (nanometers to microns thick) that, in places, preserved fenestral voids beneath. Laminae of similar thickness are, in general, common to spicular geyserites. This is the first report to demonstrate EPS templation of siliceous stromatolite laminae. Considering the ubiquity of biofilms on surfaces in hot-spring environments, EPS silicification studies are likely to be important to a better understanding of the origins of laminae in other modern and ancient stromatolitic sinters, and EPS potentially may serve as biosignatures in extraterrestrial rocks. en
dc.language EN en
dc.publisher Mary Ann Liebert, Inc. en
dc.relation.ispartofseries Astrobiology en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. Details obtained from http://www.sherpa.ac.uk/romeo/issn/1531-1074/ en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.subject Biofilms en
dc.subject Fossilization en
dc.subject Hot springs en
dc.subject Silica en
dc.subject Stromatolites en
dc.subject EXTRACELLULAR POLYMERIC SECRETIONS en
dc.subject SCANNING-ELECTRON-MICROSCOPY en
dc.subject TAUPO VOLCANIC ZONE en
dc.subject NEW-ZEALAND en
dc.subject MICROBIAL BIOFILMS en
dc.subject SILICA PRECIPITATION en
dc.subject LOW-TEMPERATURE en
dc.title Silicifying Biofilm Exopolymers on a Hot-Spring Microstromatolite: Templating Nanometer-Thick Laminae en
dc.type Journal Article en
dc.identifier.doi 10.1089/ast.2007.0172 en
pubs.issue 4 en
pubs.begin-page 747 en
pubs.volume 8 en
dc.rights.holder Copyright: Mary Ann Liebert, Inc. en
dc.identifier.pmid 18781887 en
pubs.end-page 770 en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Article en
pubs.elements-id 79630 en
pubs.org-id Science en
pubs.org-id Biological Sciences en
pubs.org-id School of Environment en
pubs.record-created-at-source-date 2010-09-01 en
pubs.dimensions-id 18781887 en


Files in this item

There are no files associated with this item.

Find Full text

This item appears in the following Collection(s)

Show simple item record

Share

Search ResearchSpace


Browse

Statistics