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dc.contributor.authorGilson, Michael  Concept link
dc.contributor.authorKalmijn, Adrianus J.  Concept link
dc.date.accessioned2018-04-13T19:29:35Z
dc.date.available2018-04-13T19:29:35Z
dc.date.issued1981-04
dc.identifier.urihttps://hdl.handle.net/1912/10247
dc.descriptionAlso published as: Biological Bulletin 159 (1980): 459-460en_US
dc.description.abstractLast year we reported on time-of-transit experiments in which magnetically orienting bacteria crossed a 1-mm stretch in the direction of a uniform magnetic field. The bacteria were found to behave as tiny self-propelled compass needles subject both to magnetic field alignment and to the randomizing effect of thermal agitation. In strong fields, magnetic bacteria are held in tight aligment; in weaker fields, their swimming paths meander more and transit times are greater. Paul Langevin derived an expression for the distribution of orientation in an ensemble of free-moving dipole particles as a function of ambient field strength. His theory becomes applicable to our experiments when bacterial migration is analyzed as a sequence of short steps during each of which the cell swims in a direction randomly selected from the Langevin distribution . The duration of each step, Δt, is actually a time constant of the cell's loss of directionality due to thermal agitation. By thus treating the migration as a process of random walk with drift, we are able to predict the mean and variance of the time of transit across a 1-mm stretch.en_US
dc.description.sponsorshipPrepared for the Office of Naval Research under Contract N00014-79-C-0071.en_US
dc.language.isoen_USen_US
dc.publisherWoods Hole Oceanographic Institutionen_US
dc.relation.ispartofseriesWHOI Technical Reportsen_US
dc.relation.ispartofseriesWHOI-81-32en_US
dc.subjectMarine sedimentsen_US
dc.subjectStatistical mechanicsen_US
dc.titleStatistical mechanics of geomagnetic orientation in sediment bacteriaen_US
dc.typeTechnical Reporten_US
dc.identifier.doi10.1575/1912/10247


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