Light-induced paramagnetism in photosynthetic systems
نویسندگان
چکیده
منابع مشابه
Femtosecond spectroscopy of photosynthetic light-harvesting systems.
Observing the elementary steps of light-harvesting in real time is now possible using femtosecond spectroscopy. This, combined with new structural data, has allowed a fairly complete description of light-harvesting in purple bacteria and substantial insights into higher plant antenna systems.
متن کاملArchitectural switch in plant photosynthetic membranes induced by light stress.
Unavoidable side reactions of photosynthetic energy conversion can damage the water-splitting photosystem II (PSII) holocomplex embedded in the thylakoid membrane system inside chloroplasts. Plant survival is crucially dependent on an efficient molecular repair of damaged PSII realized by a multistep repair cycle. The PSII repair cycle requires a brisk lateral protein traffic between stacked gr...
متن کاملSuperradiance and Exciton Delocalization in Bacterial Photosynthetic Light-Harvesting Systems
We present temperature-dependent fluorescence quantum yield and lifetime measurements on the LH-1 and LH-2 complexes of Rhodobacter sphaeroides and on the isolated B820 subunit of Rhodospirillum rubrum. From these measurements the superradiance is calculated, which is related to the delocalization of excitations in these complexes. In the B820 preparation we find a radiative rate that is 30% hi...
متن کاملEvidence for ligand-induced paramagnetism in CdSe quantum dots.
We report evidence that paramagnetism in CdSe QDs can be induced via manipulation of the surface chemistry. Using SQUID magnetometry and X-ray absorption spectroscopy, we demonstrate that the paramagnetic behavior of the CdSe QDs can be varied by changing the ligand end-group functionality of the passivating layer. Contrary to previous reports, no evidence for ferromagnetism was observed. The r...
متن کاملQuantum Coherence in Photosynthetic Light Harvesting
Recent two-dimensional (2D) electronic spectroscopic experiments revealed that electronic energy transfer in photosynthetic light harvesting involves long-lived quantum coherence among electronic excitations of pigments. These findings have led to the suggestion that quantum coherence might play a role in achieving the remarkable quantum efficiency of photosynthetic light harvesting. Further, t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Accounts of Chemical Research
سال: 1974
ISSN: 0001-4842,1520-4898
DOI: 10.1021/ar50078a004