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CATEGORIES:Seminar
DESCRIPTION:Assistant Professor of Mathematics\nUniversity of Wisconsin-Mad
 ison \n\nSwimming of microorganisms in complex fluids\n\nAbstract: It is co
 mmonly assumed in the mathematical\, biological\, and engineering communiti
 es that the fluids through which microorganisms swim are classical Newtonia
 n fluids. While this simplifies the mathematical formulation of such proble
 ms\, many important features of the real physical system are lost. Mammalia
 n spermatozoa\, for instance\, encounter several complex fluids throughout 
 the female reproductive system\, including glycoprotein-based cervical mucu
 s\, mucosal epithelium inside the fallopian tubes\, and actin-based viscoel
 astic gel outside the ovum. The responses of such fluids to deformation fre
 quently include elastic and anisotropic effects in addition to viscous diss
 ipation\, and in these environments even simple questions like "Do microorg
 anisms swim faster or slower in complex fluids?" evade simple answers. We w
 ill discuss recent investigations of helical and undulatory locomotion in v
 iscoelastic fluid\, modeled as an Oldroyd-B fluid\, and in an anisotropic f
 luid\, modeled as a liquid crystal. Elastic and anisotropic effects can eit
 her enhance or retard a microorganism's swimming speed\, and can even chang
 e the direction of swimming\, depending on the body geometry and the proper
 ties of the fluid. Our findings map out the connections among studies showi
 ng situationally dependent enhancement or retardation of swimming speeds\, 
 and may help to clarify phenomena observed in a number of biological system
 s. Other topics will make cameo appearances\, including hydrodynamic entrap
 ment by colloids\, and the transport of cargo by microorganisms in liquid c
 rystals.
DTEND:20160208T150000Z
DTSTAMP:20260315T085752Z
DTSTART:20160208T140000Z
GEO:42.445568;-76.484665
LOCATION:Olin Hall\, 165
SEQUENCE:0
SUMMARY:CBE Seminar: Saverio Spagnolie\; Swimming of microorganisms in comp
 lex fluids
UID:tag:localist.com\,2008:EventInstance_1716302
URL:https://events.cornell.edu/event/cbe_seminar_saverio_spagnolie
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