The first example of “turn-off” red fluorescence photoswitching for the representatives of nitrile-rich negative photochromes

2020 ◽  
Vol 44 (16) ◽  
pp. 6121-6124
Author(s):  
Mikhail Yu. Belikov ◽  
Mikhail Yu. Ievlev ◽  
Sergey V. Fedoseev ◽  
Oleg V. Ershov
Keyword(s):  
Visible Light ◽  
Red Fluorescence ◽  
Fluorescence Photoswitching

The first example of reversible fluorescence photoswitching by visible light was shown for the representatives of negative photochromes containing a nitrile-rich acceptor.

A multi-photoresponsive supramolecular hydrogel with dual-color fluorescence and dual-modal photodynamic action

2014 ◽  
Vol 2 (22) ◽  
pp. 3443-3449 ◽  
Author(s):  
Aurore Fraix ◽  
Ruxandra Gref ◽  
Salvatore Sortino
Keyword(s):  
Visible Light ◽  
Self Assembly ◽  
The Self ◽  
Supramolecular Hydrogel ◽  
Photodynamic Action ◽  
Red Fluorescence ◽  
Dual Color

The self-assembly of four different components forms a supramolecular hydrogel exhibiting green and red fluorescence and releasing two powerful anticancer species upon illumination with visible light.

Fabrication of ZnO nanoplates for visible light-induced imaging of living cells

2014 ◽  
Vol 2 (16) ◽  
pp. 2311-2317 ◽  
Author(s):  
Jooran Lee ◽  
Joon Sig Choi ◽  
Minjoong Yoon
Keyword(s):  
Visible Light ◽  
Hela Cells ◽  
Fluorescence Emission ◽  
Green Emission ◽  
Living Cells ◽  
Cellular Imaging ◽  
Red Fluorescence ◽  
Light Excitation

APTES-modified ZnO nanoplates (NPls) showed excellent permeability into HeLa cells with negligible cytotoxicity, exhibiting strong red fluorescence emission (∼650 nm) under visible light excitation at 405 nm. Therefore, the synthesized ZnO NPls would be useful for highly resolved cellular imaging by avoiding the overlap with the cellular intrinsic green emission.

Synthesis and Application of Europium-Doped Complexes in Fluorescence Falsification-Resistant Ink

2010 ◽  
Vol 174 ◽  
pp. 437-440
Author(s):  
Jie Meng ◽  
Cheng Sun ◽  
Jian Qing Wang ◽  
Wen Shun Sun ◽  
Xiao Xiu Hao ◽  
...  
Keyword(s):  
Visible Light ◽  
Ir Spectra ◽  
Ultraviolet Light ◽  
Fluorescence Properties ◽  
Printing Industry ◽  
Europium Complexes ◽  
Red Fluorescence ◽  
Characteristic Emission

Fluorescence falsification-resistant ink is one of the most widely used ink in packaging and printing industry. In this paper, europium complexes were synthesized by doping no-fluorescence inert ions Gd3+. IR spectra indicated that these complexes have similar structures, have bonded with the legends. The fluorescence properties indicated that the doping ions Gd3+ can enhance the fluorescence intensities, the best mole ratio of Gd3+ to Eu3+ is 1:9；At last, fluorescence falsification-resistant ink was prepared, the fluorescence ink showed the characteristic emission of Eu3+ , showed invisible in visible light and showed red fluorescence under ultraviolet light.

Fluorescence Photoswitching of a Diarylethene by Irradiation with Single-Wavelength Visible Light

2017 ◽  
Vol 139 (46) ◽  
pp. 16498-16501 ◽  
Author(s):  
Ryota Kashihara ◽  
Masakazu Morimoto ◽  
Syoji Ito ◽  
Hiroshi Miyasaka ◽  
Masahiro Irie
Keyword(s):  
Visible Light ◽  
Fluorescence Photoswitching

Studies of metaphase chromosomes in the scanning transmission x-ray microscope: Image fidelity, radiation damage and specimen preparation

1992 ◽  
Vol 50 (2) ◽  
pp. 1038-1039
Author(s):  
Shawn Williams ◽  
Xiaodong Zhang ◽  
Susan Lamm ◽  
Jack Van’t Hof
Keyword(s):  
Visible Light ◽  
Radiation Damage ◽  
Cross Section ◽  
Imaging Techniques ◽  
Dose Range ◽  
Specimen Preparation ◽  
X Rays ◽  
Metaphase Chromosomes ◽  
X Ray ◽  
Scanning Transmission

The Scanning Transmission X-ray Microscope (STXM) is well suited for investigating metaphase chromosome structure. The absorption cross-section of soft x-rays having energies between the carbon and oxygen K edges (284 - 531 eV) is 6 - 9.5 times greater for organic specimens than for water, which permits one to examine unstained, wet biological specimens with resolution superior to that attainable using visible light. The attenuation length of the x-rays is suitable for imaging micron thick specimens without sectioning. This large difference in cross-section yields good specimen contrast, so that fewer soft x-rays than electrons are required to image wet biological specimens at a given resolution. But most imaging techniques delivering better resolution than visible light produce radiation damage. Soft x-rays are known to be very effective in damaging biological specimens. The STXM is constructed to minimize specimen dose, but it is important to measure the actual damage induced as a function of dose in order to determine the dose range within which radiation damage does not compromise image quality.

Scanning luminescence x-ray microscopy: Progress toward selective staining using microspheres

1994 ◽  
Vol 52 ◽  
pp. 74-75
Author(s):  
C. Jacobsen ◽  
J. Fu ◽  
S. Mayer ◽  
Y. Wang ◽  
S. Williams
Keyword(s):  
Visible Light ◽  
Active Sites ◽  
Light Emission ◽  
Chinese Hamster ◽  
Polystyrene Spheres ◽  
Good Resistance ◽  
X Ray ◽  
Selective Staining ◽  
Visible Light Emission ◽  
Specific Labelling

In scanning luminescence x-ray microscopy (SLXM), a high resolution x-ray probe is used to excite visible light emission (see Figs. 1 and 2). The technique has been developed with a goal of localizing dye-tagged biochemically active sites and structures at 50 nm resolution in thick, hydrated biological specimens. Following our initial efforts, Moronne et al. have begun to develop probes based on biotinylated terbium; we report here our progress towards using microspheres for tagging.Our initial experiments with microspheres were based on commercially-available carboxyl latex spheres which emitted ~ 5 visible light photons per x-ray absorbed, and which showed good resistance to bleaching under x-ray irradiation. Other work (such as that by Guo et al.) has shown that such spheres can be used for a variety of specific labelling applications. Our first efforts have been aimed at labelling ƒ actin in Chinese hamster ovarian (CHO) cells. By using a detergent/fixative protocol to load spheres into cells with permeabilized membranes and preserved morphology, we have succeeded in using commercial dye-loaded, spreptavidin-coated 0.03μm polystyrene spheres linked to biotin phalloidon to label f actin (see Fig. 3).

Photocatalyst-free decarboxylative aminoalkylation of imidazo[1,2-a]pyridines with N-aryl glycines enabled by visible light

2019 ◽  
Vol 6 (21) ◽  
pp. 3693-3697 ◽  
Author(s):  
Jiu-Jian Ji ◽  
Zhi-Qiang Zhu ◽  
Li-Jin Xiao ◽  
Dong Guo ◽  
Xiao Zhu ◽  
...  
Keyword(s):  
Visible Light

A novel, green and efficient visible-light-promoted decarboxylative aminoalkylation reaction of imidazo[1,2-a]pyridines with N-aryl glycines has been described.

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