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<!--StartFragment--><p class="MsoTitle" style="text-align: center; margin-right: -0.5in;"><b><span style="font-size: 14px;">Seminar on</span></b></p><p class="MsoNormal" align="center" style="text-align:center"><span style="font-size: 14px;"><b><span style="letter-spacing: 1.5pt;">Modern Optics and Spectroscopy</span></b></span></p><div><br></div><p class="MsoNormal" align="center" style="text-align:center"><b><i><span style="letter-spacing: 1pt; font-size: 14px;">Elucidation of the mechanisms
of Photosynthetic Light Harvesting</span></i></b></p><div><br></div><p class="MsoNormal" align="center" style="text-align:center"><b><span style="letter-spacing: 1pt; font-size: 14px;">Gabriela
Schlau-Cohen,<o:p></o:p></span></b></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; font-size: 14px;">Massachusetts
Institute of Technology</span><span style="font-size: 14px; letter-spacing: 1pt;"> </span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt; font-size: 14px;">Tuesday,
March 17, 2015<o:p></o:p></span></p><p class="MsoNormal" align="center" style="text-align:center"><span style="letter-spacing: 1pt;"><span style="font-size: 14px;">12:00 –
1:00 p.m.</span><font size="6"><o:p></o:p></font></span></p><p class="MsoNormal"><span style="font-size: 14px;">In photosynthetic light
harvesting, absorbed energy migrates through a protein network to reach a
dedicated location for conversion to chemical energy. This energy flow is
efficient, directional, and regulated. The regulatory response involves complex
and complicated multi-timescale processes that safely dissipate excess energy,
thus protecting the system against deleterious photoproducts. The mechanisms
behind this photoprotective process, however, are not fully understood. We
explore these mechanisms in the major light-harvesting protein from green
plants (LHCII) by characterizing the conformational states and dynamics of
individual proteins. We identify the
extent of energy dissipation in single LHCII proteins and how the extent of
dissipation changes in response to pH and carotenoid composition, two
components known to play a role in photoprotection. From this information, we
explore how individual complexes contribute to the balance between efficiency
and adaptability in photosynthetic light harvesting. While this approach allows
us to characterize the conformational states and dynamics of individual
photosynthetic proteins, we also discuss work in progress to build on this
information to understand how these proteins combine to produce an efficient
and adaptable energy flow.</span></p><p class="MsoNormal"><o:p style="font-size: 14px;"> </o:p></p><p class="MsoNormal" align="center" style="text-align:center"><span style="font-size: 14px;">Grier Room, MIT Bldg. 34-401<o:p></o:p></span></p><p class="MsoNormal" align="center" style="text-align:center">
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<!--EndFragment--></p><p class="MsoNormal" align="center" style="text-align:center"><span style="font-size: 14px;">Refreshments served after the lecture</span><span style="font-size: 16pt;"><o:p></o:p></span></p>
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