Energy transfer in bacterial photosynthesis

1972 ◽  
Vol 3 (3-4) ◽  
pp. 211-220 ◽  
Author(s):  
A. Yu. Borisov ◽  
V. I. Godik
Keyword(s):  
Energy Transfer ◽  
Bacterial Photosynthesis

scholarly journals How carotenoids protect bacterial photosynthesis

2000 ◽  
Vol 355 (1402) ◽  
pp. 1345-1349 ◽  
Author(s):  
Richard J. Cogdell ◽  
Tina D. Howard ◽  
Robert Bittl ◽  
Erberhard Schlodder ◽  
Irene Geisenheimer ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Photosynthetic Bacteria ◽  
Bacterial Photosynthesis ◽  
Specific Reference ◽  
Structural Studies ◽  
Triplet Energy ◽  
Purple Photosynthetic Bacteria ◽  
Reaction Centres ◽  
Essential Function ◽  
Triplet Energy Transfer

The essential function of carotenoids in photosynthesis is to act as photoprotective agents, preventing chlorophylls and bacteriochlorophylls from sensitizing harmful photodestructive reactions in the presence of oxygen. Based upon recent structural studies on reaction centres and antenna complexes from purple photosynthetic bacteria, the detailed organization of the carotenoids is described. Then with specific reference to bacterial antenna complexes the details of the photoprotective role, triplet–triplet energy transfer, are presented.

A quantitative approach to inner shell losses

1978 ◽  
Vol 36 (1) ◽  
pp. 526-527 ◽  
Author(s):  
R.D. Leapman ◽  
P. Rez ◽  
D.F. Mayers
Keyword(s):  
Energy Transfer ◽  
Cross Section ◽  
Cross Sections ◽  
Accurate Determination ◽  
Background Intensity ◽  
Core Excitation ◽  
Quantitative Basis ◽  
Cross Section Differential ◽  
Bound Electrons

Microanalysis by EELS has been developing rapidly and though the general form of the spectrum is now understood there is a need to put the technique on a more quantitative basis (1,2). Certain aspects important for microanalysis include: (i) accurate determination of the partial cross sections, σx(α,ΔE) for core excitation when scattering lies inside collection angle a and energy range ΔE above the edge, (ii) behavior of the background intensity due to excitation of less strongly bound electrons, necessary for extrapolation beneath the signal of interest, (iii) departures from the simple hydrogenic K-edge seen in L and M losses, effecting σx and complicating microanalysis. Such problems might be approached empirically but here we describe how computation can elucidate the spectrum shape.The inelastic cross section differential with respect to energy transfer E and momentum transfer q for electrons of energy E0 and velocity v can be written as

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