RESUMEN
Actinomycin D specifically quenches the fluorescence of acridine orange and quinacrine bound to deoxyribonucleic acid in cytologic preparations, but does not change the fluorescence of these fluorochromes bound to RNA. The following fluorescence-cytochemical applications of techniques based on these findings can be suggested: (a) distinction between deoxyribonucleic acid and ribonucleic acid; (b) detection of double-stranded virus ribonucleic acid; (c) approximate estimation of the lengths of A-T sequences in deoxyribonucleic acid molecules.
Asunto(s)
ADN/análisis , Dactinomicina , Acridinas , Amnios/análisis , Amnios/ultraestructura , Línea Celular , Femenino , Histocitoquímica , Humanos , Microscopía Fluorescente , Embarazo , Coloración y EtiquetadoRESUMEN
The influence of a specific histone kinase, phosphorylating lysine-rich histone F1, F2a2, F2b, on the physico-chemical properties of the chromatin in the whole undestroyed fixed cell, has been investigated. It was found that the exogenous histone kinase penetrates into the nuclei of the undestroyed fixed cells and into the isolated unfixed nuclei and changes the physico-chemical properties of the chromatin there, bringing about an increase in binding of a basic dye acridine orange and a decrease in its stability to heat.