scholarly journals Reversible membrane reorganizations during photosynthesis in vivo: revealed by small-angle neutron scattering

2011 ◽  
Vol 436 (2) ◽  
pp. 225-230 ◽  
Author(s):  
Gergely Nagy ◽  
Dorthe Posselt ◽  
László Kovács ◽  
Jens K. Holm ◽  
Milán Szabó ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Higher Plants ◽  
Thylakoid Membranes ◽  
Invasive Technique ◽  
Time Resolved ◽  
Functional Changes ◽  
Non Invasive

In the present study, we determined characteristic repeat distances of the photosynthetic membranes in living cyanobacterial and eukaryotic algal cells, and in intact thylakoid membranes isolated from higher plants with time-resolved small-angle neutron scattering. This non-invasive technique reveals light-induced reversible reorganizations in the seconds-to-minutes time scale, which appear to be associated with functional changes in vivo.

scholarly journals Thylakoid membrane reorganizations revealed by small-angle neutron scattering of Monstera deliciosa leaves associated with non-photochemical quenching

Open Biology ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 200144 ◽  
Author(s):  
Renáta Ünnep ◽  
Suman Paul ◽  
Ottó Zsiros ◽  
László Kovács ◽  
Noémi K. Székely ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Structural Changes ◽  
Thylakoid Membranes ◽  
Ultrastructural Changes ◽  
Photochemical Quenching ◽  
Invasive Technique ◽  
Monstera Deliciosa ◽  
Non Photochemical Quenching

Non-photochemical quenching (NPQ) is an important photoprotective mechanism in plants and algae. Although the process is extensively studied, little is known about its relationship with ultrastructural changes of the thylakoid membranes. In order to better understand this relationship, we studied the effects of illumination on the organization of thylakoid membranes in Monstera deliciosa leaves. This evergreen species is known to exhibit very large NPQ and to possess giant grana with dozens of stacked thylakoids. It is thus ideally suited for small-angle neutron scattering measurements (SANS)—a non-invasive technique, which is capable of providing spatially and statistically averaged information on the periodicity of the thylakoid membranes and their rapid reorganizations in vivo . We show that NPQ-inducing illumination causes a strong decrease in the periodic order of granum thylakoid membranes. Development of NPQ and light-induced ultrastructural changes, as well as the relaxation processes, follow similar kinetic patterns. Surprisingly, whereas NPQ is suppressed by diuron, it impedes only the relaxation of the structural changes and not its formation, suggesting that structural changes do not cause but enable NPQ. We also demonstrate that the diminishment of SANS peak does not originate from light-induced redistribution and reorientation of chloroplasts inside the cells.

scholarly journals Low-temperature dynamics of magnetic colloids studied by time-resolved small-angle neutron scattering

2008 ◽  
Vol 77 (18) ◽  
Author(s):  
A. Wiedenmann ◽  
U. Keiderling ◽  
M. Meissner ◽  
D. Wallacher ◽  
R. Gähler ◽  
...  
Keyword(s):  
Low Temperature ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Time Resolved ◽  
Temperature Dynamics ◽  
Magnetic Colloids

Time-resolved small-angle neutron scattering study on soap-free emulsion polymerization

2006 ◽  
Vol 385-386 ◽  
pp. 780-782
Author(s):  
Ryuhei Motokawa ◽  
Satoshi Koizumi ◽  
Takeji Hashimoto ◽  
Takayuki Nakahira ◽  
Masahiko Annaka
Keyword(s):  
Neutron Scattering ◽  
Emulsion Polymerization ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Time Resolved ◽  
Scattering Study ◽  
Neutron Scattering Study ◽  
Soap Free Emulsion Polymerization
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