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Full-Text Articles in Physical Sciences and Mathematics
Height And Light: Optical Profilometry Characterization For Conservation Of Abraded Plastics, Sarah Lavin
Height And Light: Optical Profilometry Characterization For Conservation Of Abraded Plastics, Sarah Lavin
Intersections Fall 2020
This project aims to understand how surface polishing affects different materials in the context of art conservation. These materials include both those used in the creation and preservation of art objects, and those used to house and display them in a museum. Conservators at SBE Conservation and Cooper Hewitt have been working on two series of art objects, Still Life #46 and Still Life #54 by Tom Wesselman, for the past 6 years. The two sculptures are identical with the difference being that those from the Still Life #46 series were backlit while the others were not. Working with conservators …
Is The Fluorescence Quantum Yield Of Tryptophan Independent Of Excitation Wavelength?, Nadia Abbass, Luis A. Ortiz-Rodríguez, Carlos E. Crespo-Hernández
Is The Fluorescence Quantum Yield Of Tryptophan Independent Of Excitation Wavelength?, Nadia Abbass, Luis A. Ortiz-Rodríguez, Carlos E. Crespo-Hernández
Intersections Fall 2020
Tryptophan is a fluorescent amino acid that is commonly used as a probe in protein structure-dynamics studies. It is also widely used as a convenient standard for measurements of fluorescence quantum yields of organic and bioorganic molecules. Literature values of the fluorescence quantum yield range from 0.13 to 0.15 upon excitation of tryptophan at 270 nm in aqueous solution. Even though the fluorescence quantum yield of tryptophan is known with a high degree of accuracy upon excitation at 270 nm (i.e., ca. ± 0.02), this value is being used indiscriminately in the literature for the determination of the fluorescence quantum …
Remarkable Sensitivity Of The Prospective Photodynamic Therapy Agent 6-Selenoguanine To Ph, Collin Merrick, Sean J. Hoehn, Luis A. Ortiz-Rodríguez, Sarah Krul, Carlos E. Crespo-Hernández
Remarkable Sensitivity Of The Prospective Photodynamic Therapy Agent 6-Selenoguanine To Ph, Collin Merrick, Sean J. Hoehn, Luis A. Ortiz-Rodríguez, Sarah Krul, Carlos E. Crespo-Hernández
Intersections Fall 2020
The photophysical properties of the canonical DNA/RNA nucleobases can be modified by selective functionalization. The carbonyl functional group at the C6 position of guanine or 2-amino-6-oxopurine, for example, can be removed to form 2-aminopurine, thus replacing the ultrafast internal conversion pathway to the ground state observed in guanine with slow internal conversion and intersystem crossing pathways in 2-aminopurine.1 Similarly, substitution of the carbonyl oxygen in guanine with a heavier atom results in a redshift of the absorption spectrum and a remarkable modulation of the electronic relaxation pathways of the DNA nucleobase. More specifically, sulfur substitution redshifts the absorption spectrum of …
Charge Transport Properties Of Bo-Chelated Azadipyrromethenes, Tingrui Ma, Muyuan Zhao, Geneviève Sauvé
Charge Transport Properties Of Bo-Chelated Azadipyrromethenes, Tingrui Ma, Muyuan Zhao, Geneviève Sauvé
Intersections Fall 2020
Intramolecular BO-chelated azadipyrromethenes are promising organic semiconductors. Here, we evaluated the electron and hole mobility of a series of BO-chelated azadipyrromethenes using the Space Charge Limited Current(SCLC) method. In order to determine the mobility of the material, Mott Gurney's law was applied using the film thickness and slope of the J1/2 versus voltage plot in the SCLC graph. The best electron mobility observed for BO-chelated materials is 4.64—10-6 cm2V-1s-1 and the best hole mobility is 7.38—10-4 cm2V-1s-1. These results suggest that BO-chelated materials are promising p-type semiconductors for electronic applications.