Results 1 to 10 of about 1,254,309 (209)

Excitation‐Wavelength‐Dependent Functionalities of Temporally Controlled Sensing and Generation of Singlet Oxygen by a Photoexcited State Engineered Rhodamine 6G‐Anthracene Conjugate

Chemistry – A European Journal, 2022
AbstractThe present study provides design guidance for unique multipotent molecules that sense and generate singlet oxygen (1O2). A rhodamine 6G‐aminomethylanthracene‐linked donor‐acceptor molecule (RA) is designed and synthesized for demonstrating wavelength‐dependent functionalities as follows; (i) RA acts as a conventional fluorogenic 1O2 sensor ...
Hanjun Zhao, Yuta Takano, Devika Sasikumar, Yukiko Miyatake, Vasudevanpillai Biju   +4 more
openaire   +4 more sources

Photoinduced Solution‐Stable Radicals via Intramolecular Charge Separation From anti‐Kasha Emissive BN‐Azepines

Electron
Persistent and stable radicals remain challenging to generate via photoinduction, despite their vast potential in magnetics and energy storage. Trisubstituted amines offer a promising platform for photoinduced radicals, but rapid charge recombination ...
Lingjuan Chen, Jiaqi Dong, Qingliang Feng, Deng‐Tao Yang   +3 more
doaj   +1 more source

Triplet Electron Exchange in Carbon Nanodots‐assisted Long‐persistent near‐infrared Chemiluminescence for Oncology Synergistic Imaging and Therapy

Advanced Science
In classical photodynamic therapy, tumor cells are killed by the cytotoxic species via type‐I/II photochemical reactions, seriously limited by the external photoexcitation and hypoxia.
Run‐Wei Song, Tian‐Ci Jiang, Xue‐Yang Zhang, Cheng‐Long Shen, Qing Lou, Chong‐Xin Shan   +5 more
doaj   +1 more source

The Natural Anthraquinone Parietin Inactivates Candida tropicalis Biofilm by Photodynamic Mechanisms

Pharmaceutics
Background/Objectives: Parietin (PTN), a blue-light absorbing pigment from Teloschistes spp. lichens, exhibit photosensitizing properties via Type I (superoxide anion, O2•−) and Type II (singlet oxygen, 1O2) mechanisms, inactivating bacteria in vitro ...
Juliana Marioni, Bianca C. Romero, Ma. Laura Mugas, Florencia Martinez, Tomas I. Gómez, Jesús M. N. Morales, Brenda S. Konigheim, Claudio D. Borsarelli, Susana C. Nuñez-Montoya   +8 more
doaj   +1 more source

Application of Amino Acid-Based Carbon Dots for the Treatment of Oral Bacteria and Oral Cancer Cells In Vitro Using a Dental Light-Curing Unit via ROS-Mediated Therapy

Nanomaterials
In systemic diseases, controlling oral bacteria and cancer is an important issue. As biomaterials, recently, carbon dots (DSs) are the focus of a variety of studies owing to their extensive applicability in life sciences. In this study, the effectiveness
So-Young Park, Wooil Kim, Unchul Shin, Yong Hoon Kwon, Franklin Garcia-Godoy, Hye-Ock Jang   +5 more
doaj   +1 more source

Generation of singlet oxygen at room temperature mediated by energy transfer from photoexcited porousSi [PDF]

Physical Review B, 2004
Photoluminescence (PL) from singlet oxygen generated by energy transfer from porous $\mathrm{Si}$ is observed at room temperature in an organic solvent. The evidence of the indirect excitation by energy transfer is obtained from PL excitation spectroscopy.
Fujii, Minoru, Hayashi, Shinji, Minobe, Shingo, Usui, Motofumi, Gross, Egon, Diener, Joachim, Kovalev, Dmitri   +6 more
openaire   +1 more source

X-ray radiation-induced and targeted photodynamic therapy with folic acid-conjugated biodegradable nanoconstructs

International Journal of Nanomedicine, 2018
Sandhya Clement,1,2,* Wenjie Chen,1,* Wei Deng,1,2 Ewa M Goldys1,2 1Australian Research Council Centre of Excellence for Nanoscale BioPhotonics (CNBP), Department of Physics and Astronomy, Macquarie University, Sydney, NSW, Australia; 2The Graduate ...
Clement S, Chen W, Deng W, Goldys EM
doaj  

Relaxation Process of the Photoexcited State and Singlet Oxygen Generating Activity of Water-soluble meso-Phenanthrylporphyrin in a DNA Microenvironment

Rapid Communication in Photoscience, 2014
To examine the microenvironmental effect of DNA on the photosensitized reaction, the electron-donor-connecting porphyrin, meso-(9-phenanthryl)-tris(N-methyl-p- pyridinio)porphyrin (Phen-TMPyP), was synthesized. Phen-TMPyP can bind to oligonucleotides with two binding modes, depending on the DNA concentration.
Kazutaka Hirakawa, Yusuke Ito, Takashi Yamada, Shigetoshi Okazaki   +3 more
openaire   +2 more sources

Measuring the Efficiency of Raman Photoexcitation of Singlet Oxygen in Distilled Water

We determine the efficiency of singlet oxygen generated through a Raman excitation process in aerated distilled water. Focused nanosecond light pulses in the spectral blue region induce Raman transition toward the singlet oxygen state, generating a Stokes signal in the red spectral region.
openaire   +1 more source

Mechanistic Insights into Photo-Induced Bond Dissociation of a 2-(4-Nitrophenyl)-1H-indole-3-ylmethyl (NPIM) Derivative: A Case Study on Quantum Spin-Manipulation for Uncaging. [PDF]

J Am Chem Soc
Kuroishi K, Hayashi R, Oyama R, Tanaka S, Ogawa K, Murotani Y, Matsunaga R, Yoshinobu J, Abe M.   +8 more
europepmc   +1 more source