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DTSTART:20070311T020000
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UID:7286d68a-2d50-4002-9b74-2535be06775e.229536@calendar.missouristate.edu
CREATED:20230919T180840Z
LAST-MODIFIED:20230919T180840Z
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SUMMARY:PAMS Seminar: "Hydration Solids" by Dr. Steven Harrellson
DESCRIPTION:Dr. Steven HarrellsonColumbia UniversityDepartment of Physics\
 n\n\nAbstract:\n\n\nHygroscopic biological matter in plants\, fungi and b
 acteria make up a large fraction of Earth’s biomass. Although metabolical
 ly inert\, these water-responsive materials exchange water with the envir
 onment and actuate movement and have inspired technological uses. Despite
  the variety in chemical composition\, hygroscopic biological materials a
 cross multiple kingdoms of life exhibit similar mechanical behaviors incl
 uding changes in size and stiffness with relative humidity. In this talk\
 , I will discuss atomic force microscopy measurements on the hygroscopic 
 spores of a common soil bacterium and the development of a theory that ca
 ptures their mechanical behavior. This theory\, based on the disruption o
 f water structure\, explains an extreme slowdown of water transport and s
 uccessfully predicts a strong nonlinear elasticity. These results indicat
 e that water not only endows biological matter with fluidity but can also
  provide rigid support. This unique behavior is why we call these materia
 ls "Hydration Solids".\n\n\nDr. Steven Harrellson is an alumni of PAMS.\n
 \n\nThis seminar is via Zoom: https://missouristate.zoom.us/j/96444437857
X-ALT-DESC;FMTTYPE=text/html:&lt;html&gt;&lt;head&gt;&lt;title&gt;&lt;/title&gt;&lt;/head&gt;&lt;body&gt;&lt;p&gt;&lt;b
 &gt;Dr.&amp;nbsp\;Steven Harrellson&lt;/b&gt;&lt;br&gt;&lt;b&gt;Columbia University&lt;br&gt;Department 
 of Physics&lt;/b&gt;&lt;/p&gt;\n&lt;p&gt;Abstract:&lt;/p&gt;\n&lt;p&gt;Hygroscopic biological matter in
  plants\, fungi and bacteria make up a large fraction of Earth’s biomass.
  Although metabolically inert\, these water-responsive materials exchange
  water with the environment and actuate movement and have inspired techno
 logical uses. Despite the variety in chemical composition\, hygroscopic b
 iological materials across multiple kingdoms of life exhibit similar mech
 anical behaviors including changes in size and stiffness with relative hu
 midity. In this talk\, I will discuss atomic force microscopy measurement
 s on the hygroscopic spores of a common soil bacterium and the developmen
 t of a theory that captures their mechanical behavior. This theory\, base
 d on the disruption of water structure\, explains an extreme slowdown of 
 water transport and successfully predicts a strong nonlinear elasticity. 
 These results indicate that water not only endows biological matter with 
 fluidity but can also provide rigid support. This unique behavior is why 
 we call these materials "Hydration Solids".&lt;/p&gt;\n&lt;p&gt;&lt;b&gt;Dr.&amp;nbsp\;Steven H
 arrellson is an alumni of PAMS.&lt;/b&gt;&lt;/p&gt;\n&lt;p&gt;&lt;b&gt;This seminar is via Zoom:&amp;
 nbsp\;https://missouristate.zoom.us/j/96444437857&lt;/b&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;
DTSTART;TZID=America/Chicago:20230921T160000
DTEND;TZID=America/Chicago:20230921T170000
SEQUENCE:0
URL:https://physics.missouristate.edu/seminars.htm
CATEGORIES:Public,Alumni,Current Students,Faculty,Future Students,Staff
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