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2017 ; 114
(37
): 9797-9802
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Adaptive-illumination STED nanoscopy
#MMPMID28847959
Heine J
; Reuss M
; Harke B
; D'Este E
; Sahl SJ
; Hell SW
Proc Natl Acad Sci U S A
2017[Sep]; 114
(37
): 9797-9802
PMID28847959
show ga
The concepts called STED/RESOLFT superresolve features by a light-driven transfer
of closely packed molecules between two different states, typically a
nonfluorescent "off" state and a fluorescent "on" state at well-defined
coordinates on subdiffraction scales. For this, the applied light intensity must
be sufficient to guarantee the state difference for molecules spaced at the
resolution sought. Relatively high intensities have therefore been applied
throughout the imaging to obtain the highest resolutions. At regions where
features are far enough apart that molecules could be separated with lower
intensity, the excess intensity just adds to photobleaching. Here, we introduce
DyMIN (standing for Dynamic Intensity Minimum) scanning, generalizing and
expanding on earlier concepts of RESCue and MINFIELD to reduce sample exposure.
The principle of DyMIN is that it only uses as much on/off-switching light as
needed to image at the desired resolution. Fluorescence can be recorded at those
positions where fluorophores are found within a subresolution neighborhood. By
tuning the intensity (and thus resolution) during the acquisition of each
pixel/voxel, we match the size of this neighborhood to the structures being
imaged. DyMIN is shown to lower the dose of STED light on the scanned region up
to ?20-fold under common biological imaging conditions, and >100-fold for sparser
2D and 3D samples. The bleaching reduction can be converted into accordingly
brighter images at <30-nm resolution.