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Light at the End of the Funnel: Fluorescence-Detected Two-Dimensional Electronic Spectroscopy to Probe Photosynthesis in Bacteria
Light at the End of the Funnel: Fluorescence-Detected Two-Dimensional Electronic Spectrosc...
Light at the End of the Funnel: Fluorescence-Detected Two-Dimensional Electronic Spectroscopy to Probe Photosynthesis in Bacteria

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자료유형  
 학위논문 서양
최종처리일시  
20250211152102
ISBN  
9798382739816
DDC  
535
저자명  
Javed, Ariba.
서명/저자  
Light at the End of the Funnel: Fluorescence-Detected Two-Dimensional Electronic Spectroscopy to Probe Photosynthesis in Bacteria
발행사항  
[Sl] : University of Michigan, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
194 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
주기사항  
Advisor: Goldman, Rachel;Ogilvie, Jennifer.
학위논문주기  
Thesis (Ph.D.)--University of Michigan, 2024.
초록/해제  
요약Photosynthesis relies on solar energy absorption by the light-harvesting complexes and ultrafast energy transfer to the reaction centers, where the excitation is converted into a stable charge-separated state. This process happens with a high quantum efficiency ∼1. The mechanisms underlying the ultrafast energy and charge transfer in photosynthesis have been the subject of numerous spectroscopic studies. In this thesis, I focus on fluorescence-detected two-dimensional electronic spectroscopy (F2DES) which offers high sensitivity and the ability to be combined with a microscope, an added advantage to its coherently-detected counterpart, C-2DES.Fundamental differences between C-2DES and F-2DES techniques lead to strikingly different looking spectra. Currently, F-2DES is not very well-understood as compared to C-2DES and warrants more investigation. The light-harvesting 2 complex in photosynthetic bacteria is a well characterized pigment-protein complex and makes for an ideal model system to understand the potential of F-2DES for studying multichromophoric systems. In this thesis, we compare F-2DES and C-2DES by studying the energy transfer dynamics in purple bacterial LH2 using the two methods. From our experiments, we determine that C-2DES is clearly a better choice than the F-2DES to study energy transfer dynamics in large systems. This is because in case of F-2DES, an increasing number of chromophores in the system reduces the relative weights of pathways that can reveal energy transfer signatures to the ones that are present as a large background in the signal. We also present preliminary F-2DES simulations on LH2 to support our findings. In addition, we report preliminary F2DES measurements to probe the energy transfer in a newly discovered phototrophic bacterial species Gemmatimonas phototrophica. We point out that the F-2DES measurements may benefit from lower acquisition times, which would help achieve higher averaging. To this end, we present a rapid-scanning F-2DES methodology based on continuous time-delay scanning and digital lock-in acquisition. In addition, a broadband method capable of improving the bandwidth accessed with our current F-2DES measurements is demonstrated.
일반주제명  
Optics
일반주제명  
Biophysics
일반주제명  
Engineering
일반주제명  
Energy
일반주제명  
Materials science
키워드  
Ultrafast spectroscopy
키워드  
Multichromophoric systems
키워드  
Energy transfer
키워드  
Photosynthesis
기타저자  
University of Michigan Materials Science and Engineering
기본자료저록  
Dissertations Abstracts International. 85-12B.
전자적 위치 및 접속  
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MARC

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■0820  ▼a535
■1001  ▼aJaved,  Ariba.
■24510▼aLight  at  the  End  of  the  Funnel:  Fluorescence-Detected  Two-Dimensional  Electronic  Spectroscopy  to  Probe  Photosynthesis  in  Bacteria
■260    ▼a[Sl]▼bUniversity  of  Michigan▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a194  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  Goldman,  Rachel;Ogilvie,  Jennifer.
■5021  ▼aThesis  (Ph.D.)--University  of  Michigan,  2024.
■520    ▼aPhotosynthesis  relies  on  solar  energy  absorption  by  the  light-harvesting  complexes  and  ultrafast  energy  transfer  to  the  reaction  centers,  where  the  excitation  is  converted  into  a  stable  charge-separated  state.  This  process  happens  with  a  high  quantum  efficiency  ∼1.  The  mechanisms  underlying  the  ultrafast  energy  and  charge  transfer  in  photosynthesis  have  been  the  subject  of  numerous  spectroscopic  studies.  In  this  thesis,  I  focus  on  fluorescence-detected  two-dimensional  electronic  spectroscopy  (F2DES)  which  offers  high  sensitivity  and  the  ability  to  be  combined  with  a  microscope,  an  added  advantage  to  its  coherently-detected  counterpart,  C-2DES.Fundamental  differences  between  C-2DES  and  F-2DES  techniques  lead  to  strikingly  different  looking  spectra.  Currently,  F-2DES  is  not  very  well-understood  as  compared  to  C-2DES  and  warrants  more  investigation.  The  light-harvesting  2  complex  in  photosynthetic  bacteria  is  a  well  characterized  pigment-protein  complex  and  makes  for  an  ideal  model  system  to  understand  the  potential  of  F-2DES  for  studying  multichromophoric  systems.  In  this  thesis,  we  compare  F-2DES  and  C-2DES  by  studying  the  energy  transfer  dynamics  in  purple  bacterial  LH2  using  the  two  methods.  From  our  experiments,  we  determine  that  C-2DES  is  clearly  a  better  choice  than  the  F-2DES  to  study  energy  transfer  dynamics  in  large  systems.  This  is  because  in  case  of  F-2DES,  an  increasing  number  of  chromophores  in  the  system  reduces  the  relative  weights  of  pathways  that  can  reveal  energy  transfer  signatures  to  the  ones  that  are  present  as  a  large  background  in  the  signal.  We  also  present  preliminary  F-2DES  simulations  on  LH2  to  support  our  findings.  In  addition,  we  report  preliminary  F2DES  measurements  to  probe  the  energy  transfer  in  a  newly  discovered  phototrophic  bacterial  species  Gemmatimonas  phototrophica.  We  point  out  that  the  F-2DES  measurements  may  benefit  from  lower  acquisition  times,  which  would  help  achieve  higher  averaging.  To  this  end,  we  present  a  rapid-scanning  F-2DES  methodology  based  on  continuous  time-delay  scanning  and  digital  lock-in  acquisition.  In  addition,  a  broadband  method  capable  of  improving  the  bandwidth  accessed  with  our  current  F-2DES  measurements  is  demonstrated.
■590    ▼aSchool  code:  0127.
■650  4▼aOptics
■650  4▼aBiophysics
■650  4▼aEngineering
■650  4▼aEnergy
■650  4▼aMaterials  science
■653    ▼aUltrafast  spectroscopy
■653    ▼aMultichromophoric  systems
■653    ▼aEnergy  transfer
■653    ▼aPhotosynthesis
■690    ▼a0786
■690    ▼a0752
■690    ▼a0794
■690    ▼a0537
■690    ▼a0791
■71020▼aUniversity  of  Michigan▼bMaterials  Science  and  Engineering.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0127
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162841▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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