Search results for "Acridine"
showing 5 items of 65 documents
A study of weathered coal spectroscopic properties
2017
Abstract Current coal industry causes significant environmental pollution and the most air pollution deaths in the world, making the development of new eco-friendly applications one of the top priorities. Coal contains up to 50 % humic substances (HS), the majority of which is humic acid (HA). HA is well known for its beneficial properties and thus compounds extracted from coal can be used to develop new applications. To address this issue, we assessed structural composition of coal HS by measuring their spectroscopic properties. As the result, obtained spectra can be used to identify information about the molecules and thus allowing describing the composition of HS. The purpose of this stu…
Oxidative DNA Damage Profiles in Mammalian Cells
1997
Reactive oxygen species (ROS) are formed inside cells not only under the influence of exogenous agents (visible light, ionizing radiation, and many oxidants such as peroxides or quinones), but also under normal (physiological) conditions as byproducts of oxygen metabolism and other cellular redox reactions (Pryor 1986; Halliwell and Gutteridge 1986; Sies 1986; Clayson et al. 1994). ROS such as hydroxyl radicals and singlet oxygen are a serious threat to the integrity of the cellular genome, since they efficiently react with DNA to generate many types of DNA modifications, at least some of which are pre- mutagenic (Breimer 1990; Halliwell and Aruoma 1991; Epe 1991; Feig et al. 1994). Steady-…
A Theoretical Insight into the Photophysics of Acridine
2001
The electronic absorption and emission spectra of acridine have been studied by means of a multiconfigurational second-order perturbation method (CASSCF/CASPT2) and its multistate extension (MS-CASPT2). The low-lying valence singlet and triplet π → π* and n → π* excited states have been computed. The location of the lowest Rydberg state (3s) has been also estimated. By optimization of the geometries of the ground and low-lying excited states and the calculation of transition energies and properties, the obtained results lead to a complete analysis and assignment of the available experimental singlet−singlet and triplet−triplet absorption spectra and to the description of the basic features …
PHOSPHORORGANISCHE VERBINDUNGEN 1091DIE SYNTHESE FLUORESZIERENDER REAGENTIEN MIT CHEMOSELEKTIVEN ANKERGRUPPEN
1984
Abstract A route for the synthesis of type B-compounds is reported. Compound 5 is a strong fluorescent and is O-selective. Type C-compounds, for example 10a to 10d show a high fluorescence and are O-selective. They are obtained via 6 and 7 (n=2–4,6; R=Me, X=F). Boc-serine is O-phosphonylated by the methyl-phosphonicacid-esterfluorides, for example 10c. ω-(9-Acridinyl)alkyl-phosphonicacid-alkyl-esterfluorides, like 22, are available in only moderate yields via 15a-e as intermediates. More but unsuccessful experiments for the synthesis of fluorescent and O-selective acridine compounds are reported shortly. Die Synthese von Verbindungen vom Typ B wird beschrieben. Die Verbindung 5 verbindet Fl…
Apparent content curves: new analytical applications
1993
Analytical possibilities of apparent content curves for ternary systems are studied. The mathematical method proposed is applied to UV-Vis spectrophotometric and fluorimetric techniques. Samples containing fluoresceine/eosine/acridine and methyl red/methyl orange/cresol red are resolved by fluorimetry and UV-spectroscopy, respectively. Results obtained are in agreement with the theoretical contents in both cases.