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SUMMARY:Developing and using atomic force microscopy to understand soft an
 d biological systems\, from bacteria to plastic bags - Professor Jamie Hob
 bs\, Physics Department\, University of Sheffield
DTSTART:20150515T130000Z
DTEND:20150515T140000Z
UID:TALK55261@talks.cam.ac.uk
CONTACT:Dr Eileen Nugent
DESCRIPTION:This talk will be split into three sections. In the first data
  will be presented using atomic force microscopy (AFM) to explore the mech
 anical properties of the cell wall of the gram positive bacteria Staphyloc
 occus aureus through the cell cycle. S. aureus divides in an unusual way\,
  in which new cell wall is only deposited in the septum that divides the t
 wo daughter cells\, and subsequent growth occurs through the re-engineerin
 g of this material. New evidence that cell growth in fact occurs through d
 egradation of the cell wall will be presented. Secondly\, a new form of AF
 M\, “torsional tapping AFM” will be presented which allows imaging at 
 true molecular resolution under ambient conditions. This new technique has
  been used to address some long standing questions in how synthetic polyme
 rs crystallize and in the nature of the crystal amorphous interface which 
 is instrumental in giving many commodity polymers (such as plastic bags) t
 heir desirable mechanical properties. Finally\, progress in using this tec
 hnology to unravel the molecular architecture of bacterial envelopes\, inc
 luding the exosporium of the food pathogen Bacillus cereus\, will be prese
 nted.
LOCATION:Ryle Seminar Room no930\, Rutherford Building\, Cavendish Laborat
 ory
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