Detection of photosensitized singlet oxygen luminescence in systems of biomedical importance: steady-state and time-resolved measurements based on application of S-1 photomultiplier tubes

1993 ◽  
Author(s):  
Alexander A. Krasnovsky, Jr.
Keyword(s):  
Steady State ◽  
Singlet Oxygen ◽  
Photomultiplier Tubes ◽  
Time Resolved ◽  
Time Resolved Measurements

scholarly journals Can we use time-resolved measurements to get steady-state transport data for halide perovskites?

2018 ◽  
Vol 124 (10) ◽  
pp. 103103 ◽  
Author(s):  
Igal Levine ◽  
Satyajit Gupta ◽  
Achintya Bera ◽  
Davide Ceratti ◽  
Gary Hodes ◽  
...  
Keyword(s):  
Steady State ◽  
Time Resolved ◽  
Halide Perovskites ◽  
Time Resolved Measurements

GaAs/AIAs superlattices under pressure: steady-state and subpicosecond time-resolved measurements

1992 ◽  
Vol 9 (1-6) ◽  
pp. 83-92 ◽  
Author(s):  
K. Reimann ◽  
M. Holtz ◽  
K. Syassen ◽  
J. Nunnenkamp ◽  
J. Kuhl ◽  
...  
Keyword(s):  
Steady State ◽  
Time Resolved ◽  
Time Resolved Measurements

scholarly journals Photophysical properties of two novel tetraphenylporphyrins substituted by guanidiniocarbonyl and monocyclic guanidine groups

2001 ◽  
Vol 3 (3) ◽  
pp. 147-151 ◽  
Author(s):  
Pavel Kubát ◽  
Kamil Lang ◽  
Vladimír Král ◽  
Franz P. Schmidtchen
Keyword(s):  
Steady State ◽  
Quantum Yield ◽  
Singlet Oxygen ◽  
Electronic Absorption Spectra ◽  
Photophysical Properties ◽  
Soret Band ◽  
Monomeric Form ◽  
High Quantum Yield ◽  
Time Resolved ◽  
J Aggregates

Photophysical properties of two novel guanidiniocarbonyl (I) and monocyclic guanidine (II) tetraphenylporphyrins and their interaction with DNA were investigated by steady-state and time-resolved absorption and emission spectroscopies.Istays predominantly monomeric in aqueous solutions. It produces singlet oxygen with high quantum yield(ΦΔ=0.67)that is typical for monomeric porphyrins. The electronic absorption spectra ofIare not influenced by interaction with DNA. This is in contrast with monomeric tetratolylporphyrins bearing phosphonium,ammonium and pyridinium groups where the formation of stable complexes with DNA is accompanied by a characteristic red shift of the Soret band.IIextensively forms Hand J-aggregates,which do not produce singlet oxygen(ΦΔ<0.01). In the presence of DNA only a small fraction ofIIremains in monomeric form that is bound to DNA exterior.

Simple Fiber-Optic-Based Interface to Facilitate Spectroscopic Measurements in Supercritical Solvents

1992 ◽  
Vol 46 (12) ◽  
pp. 1895-1897 ◽  
Author(s):  
Joann Zagrobelny ◽  
Ming Li ◽  
Run Wang ◽  
Thomas A. Betts ◽  
Frank V. Bright
Keyword(s):  
High Pressure ◽  
Steady State ◽  
Fiber Optic ◽  
Optical Cell ◽  
Time Resolved ◽  
Spectroscopic Measurements ◽  
Fluorescence Measurements ◽  
Time Resolved Measurements ◽  
Supercritical Solvents

A new fiber-optic-based interface is described to facilitate fluorescence measurements in supercritical solvents. Steady-state and time-resolved measurements are possible, and assembly/disassembly is significantly easier compared to that required for traditional high-pressure optical cell designs.

scholarly journals The phthalocyanines applications in photodynamic therapy investigated by time-resolved and steady-state photothermal methods

2002 ◽  
Vol 4 (2) ◽  
pp. 51-56 ◽  
Author(s):  
Danuta Frackowiak ◽  
Krzysztof Wiktorowicz ◽  
Alfons Planner ◽  
Aneta Waszkowiak ◽  
Rodica-Mariana Ion
Keyword(s):  
Photodynamic Therapy ◽  
Steady State ◽  
Triplet State ◽  
Singlet Oxygen ◽  
Direct Interaction ◽  
Time Resolved ◽  
Oxygen Generation ◽  
Photoacoustic Spectra ◽  
Singlet Oxygen Generation ◽  
Photothermal Methods

The time-resolved photothermal methods are used in order to establish the yield of intersystem (singlet-triplet) crossing of dyes that are candidates for the application in photodynamic therapy. It is known that molecules with long living triplet state cause efficient photosensitization by direct interaction with the cells or by singlet oxygen generation.The steady state photoacoustic spectra enables one to establish the dye incorporation into cells.Both methods were applied to several phthalocyanines and the results gathered by photothermal measurements were compared with the results obtained by means of other methods.The six investigated dyes were compared.

scholarly journals Aqueous singlet oxygen reaction kinetics of furfuryl alcohol: effect of temperature, pH, and salt content

2017 ◽  
Vol 19 (4) ◽  
pp. 507-516 ◽  
Author(s):  
Elena Appiani ◽  
Rachele Ossola ◽  
Douglas E. Latch ◽  
Paul R. Erickson ◽  
Kristopher McNeill
Keyword(s):  
Aqueous Solution ◽  
Steady State ◽  
Singlet Oxygen ◽  
Furfuryl Alcohol ◽  
Salt Content ◽  
Effect Of Temperature ◽  
Time Resolved ◽  
Value Determination ◽  
Singlet Oxygen Reaction ◽  
Kinetics Of

The rate constant for the reaction between furfuryl alcohol (FFA) and singlet oxygen (1O2) in aqueous solution was measured as a function of temperature, pH and salt content employing both steady-state photolysis (β value determination) and time-resolved singlet oxygen phosphorescence methods.

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