检索结果-南通市图书馆

Decoherence-and Dimerization-assisted Energy Transport in Protomer of light-harvesting complexes

在线全文

学校读者我要写书评

暂无评论

引用

Communications in Theoretical Physics 2016年第1期65卷 114-120页

作者：周运清李有泉 Department of Physics and Key Laboratory of Oceanographic Big Data Mining & Application of Zhejiang Province Zhejiang Ocean University Zhejiang Institute of Modern Physics and Department of Physics Zhejiang University

We have investigated the dynamics of a protomer coupled to two different decoherent environments,each in a configuration called the spin star *** the quantum mechanics method,in different situations,we obtain the analytical expressions for the transition probability in the protomer *** thermal equilibrium,there exist well-defined ranges of parameters for which decoherent interaction between the protomer and the environment assists energy transfer in the protomer system,while in pure quantum mechanics states,the decoherent interaction assists energy transfer for an eigenstate but against energy transfer for quantum mechanics *** particular,we also find that the dimerization of two bacteriochlorophylls in protomer can always assist energy transfer in certain parameter range,and in the appropriate spin bath energy,the efficiency of energy transport is sensitively depended on the temperature of environments.

关键词： clecoherence assisted energy transport light-harvesting complexes protomer

Energy Transfer in the light-harvesting complexes of Purple Bacteria

在线全文

学校读者我要写书评

暂无评论

引用

Communications in Theoretical Physics 2018年第8期69卷 225-229页

作者： Bei-Bei He Meng-Meng Ming Chang-Yong Liu Guo-Dong Wang Li Qin You-Wei Li College of Science Northwest A＆F UniversityYangling 712100China

In this paper, we use a nonlinear decohering quantum model to study the initial step of photosynthesis which is an ultrafast transfer process of absorption the sunlight by light-harvesting complexes and electronic excitation transfer to the reaction center(RC). In this decohering model, the Hamiltonian of the system commutes with the systemenvironment interaction. We take B850 ring of light-harvesting complex II(LH-II) in purple bacteria as an example to calculate the efficiency of the energy transfer as a function of time. We find that the environmental noise can make the LH-II have stable energy transfer efficiency over a long time. This is to say that the environmental noise which is the decohering source has advantage of the energy transfer in the process of photosynthesis.

关键词： photosynthesis light-harvesting complexes energy transfer efficiency

Structural Analysis of Peptides of PSⅡ light-harvesting complexes in Siphonous Green Algae, Codium fragile

在线全文

学校读者我要写书评

暂无评论

引用

Acta Botanica Sinica 2002年第2期44卷 147-151页

作者：陈敏李爱芬周百成烟台大学生物化学系烟台264005 中国科学院海洋研究所青岛266071

Peptide composition and arrangement of 4 major light-harvesting complexes LHCP 1-3 and LHCP 3′ isolated from siphonous green algae (Codium fragile (Sur.) Hariot.) were investigated. LHCP 1 showed five main peptides, 34.4, 31.5, 29.5, 28.2 and 26.5 kD in SDS-PAGE, the 34.4 and 31.5 kD peptides were never found in higher plants. LHCP 3 contained the other four kinds of LHCP 1 peptides except 34.4 kD, while LHCP 3′ consisted of only 28.2 and 26.5 kD peptides. We found that 34.4, 28.2 and 26.5 kD peptides were easy to decompose from LHCP 1 when subjected to SDS-PAGE without pretreatment. They might be located at the exterior of LHCP 1, while the 31.5 and 29.5 kD peptides were at the central part. The 28.2 and 26.5 kD peptides often occurred in CPa, the center complex of PSⅡ. They are possibly the LHCⅡ peptides tightly associated with CCⅡ. According to the results described above, a peptide map of LHCP 1 was sketched.

关键词： light-harvesting complexes peptide arrangement structure Codium fragile