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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 Spectroscopy to Probe Photosynthesis in Bacteria
상세정보
- 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
- Energy transfer
- 키워드
- Photosynthesis
- 기타저자
- University of Michigan Materials Science and Engineering
- 기본자료저록
- Dissertations Abstracts International. 85-12B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211152102
■006m o d
■007cr#unu||||||||
■020 ▼a9798382739816
■035 ▼a(MiAaPQ)AAI31349032
■035 ▼a(MiAaPQ)umichrackham005369
■040 ▼aMiAaPQ▼cMiAaPQ
■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.


