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However, little is known about how the physical environment experienced by free-living or host-associated bacteria influences such competition. We used the bioluminescent squid symbiont\n            <jats:named-content content-type=\"genus-species\">Vibrio fischeri<\/jats:named-content>\n            to study how environmental viscosity impacts bacterial competition. Our results suggest that upon transition from a planktonic environment to a host-like environment,\n            <jats:named-content content-type=\"genus-species\">V. fischeri<\/jats:named-content>\n            cells activate their type VI secretion system, a contact-dependent interbacterial nanoweapon, to eliminate natural competitors. This work shows that competitor cells form aggregates under host-like conditions, thereby facilitating the contact required for killing, and reveals how\n            <jats:named-content content-type=\"genus-species\">V. fischeri<\/jats:named-content>\n            regulates a key competitive mechanism in response to the physical environment.\n          <\/jats:p>","DOI":"10.1128\/mbio.03060-19","type":"journal-article","created":{"date-parts":[[2020,2,3]],"date-time":"2020-02-03T10:53:33Z","timestamp":1580727213000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":49,"title":["Environmental Viscosity Modulates Interbacterial Killing during Habitat Transition"],"prefix":"10.1128","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0249-4791","authenticated-orcid":false,"given":"Lauren","family":"Speare","sequence":"first","affiliation":[{"name":"Department of Marine Sciences, University of North Carolina, 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