The complexations of the singly charged cations of 3-aminoacridine and 7-aminoquinoline by double-stranded, calf thymus DNA were studied by electronic absorption spectrophotometry. At high ratios of total DNA phosphate ...

The occurrence of the second absorption band of singly protonated 9-aminoacridine, which arises from an acridinium ring-localized transition, at anomalously short wavelength indicates the disruption of the aromaticity of ...

pH and Hammett acidity dependences of the blue fluorescences of the quinolinium ion and some related species indicate that the thermally relaxed lLb and'L, states of the quinolinium ion are degenerate and that fluorescence ...

The shifts in the absorption and fluorescence spectra of 3-aminoacridine, proflavine, acridine orange, and acridine yellow were employed to show that the singly charged cations, the predominant species at biological pH, ...

Altering the combined hydrophilic-lipophilic balance (CHLB), by varying the ratio of dual surfactants, on formulation parameters and in vitro drug release of ethyl cellulose microspheres was examined. Theophylline, a ...

Fluorescence, excitation, and emission spectra of some benzo[a]pyrene diols and diol epoxides in aqueous and non-aqueous media have been studied and ground- and excited-state dissociation constants have been determined. ...

The pre-chemiluminescent hydrogen peroxide-bis(2,4-dinitrophenyl) oxalate reaction has been studied in order to understand better its role in peroxyoxalate chemiluminescence. The reaction is shown to be first order in each ...

In the development of the extraction procedure for the analysis of nicotine and cotinine from a single breast milk sample, nicotine and cotinine were detected in 3 of 10 nonsmoking mothers' milk samples. Interviews of these ...

Stop-flow chemiluminescence (CL) has been used to determine the conditions necessary for the oxalate ester CL detection of selected retinoids after separation by normal-phase HPLC. Also, the detection of the selected ...