The chloroplast of Chlamydomonas moewusii was examined by electron microscopic and cytochemical methods for the possible presence of DNA. Both the Feulgen reaction and acridine orange indicated the presence within the chloroplast of one or more irregularly shaped DNA-containing bodies generally in the vicinity of the pyrenoid. Electron micrographs revealed 25 A microfibrils in these areas which...

A quiescent (nonproliferating) subpopulation was identified by flow cytometric analysis using two-step acridine orange staining in the EMT6/Rochester, N. Y. subline multicellular tumor spheroid, an in vitro culture system which provides a cellular microenvironment which mimics that of many of in vivo tumors. To isolate a viable quiescent cell subpopulation, centrifugal elutriation which allows ...

irst well defined case of the mutagenic effectiveness of chemicals was Tyet:ied for mustard gas treatment of Drosophila by AUERBACH and ROBSON ( 1946). Chemical mutagenesis studies have since been extended to a number of biological systems, including bacteria, fungi and higher organisms. AUERBACH (1965) has discussed the development of chemical mutagenesis in the last 20 years. The application ...

4,5-Bis(aminomethyl)acridine, useful as an immunosuppressant, was prepared in 31% overall yield by the reaction of acridine with N-(hydroxymethyl)phthalimide and subsequent decomposition with excess 6 N HCl. The drug was found to produce a suppression of the humoral antibody response comparable to several known immunosuppressive agents.

The fluorescence technique described here utilizes the electrostatic interaction between the polyanionic sites of glycosaminoglycans and the cationic dye Acridine Orange to analyse urinary glycosaminoglycans from patients suffering from mucopolysaccharidoses. The basis of the titration is the decrease in the fluorescence of free Acridine Orange that occurs when it is bound to polyanions. The ef...

In the crystal structure of the title compound, C(21)H(16)NO(2) (+)·CF(3)SO(3) (-)·H(2)O, the anions and the water mol-ecules are linked by O-H⋯O inter-actions, while the cations form inversion dimers through π-π inter-actions between acridine ring systems. These dimers are linked by C-H⋯O and C-F⋯π inter-actions to adjacent anions, and by C-H⋯π inter-actions to neighboring cations. The water m...

LTHOUGH FLUORESCENCE microscopy had its beginnings over half a century ago, it has only recently gained widespread usage as a research tool, and practical applications have yet to be fully exploited. Blood has been one of the tissues most extensively studied by fluorochroming,’ but few reports have been published in English. In addition, the previously reported saline dilution technics for supr...

ONVINCING evidence has been provided to show that respiratory mutants C of yeast can arise as a result of extranuclear, as well as nuclear change (EPHRUSSI, HOTTINGUER and TAVLITZKI 1949). The extranuclear mutants are known as " vegetative petites. " At least two classes of them exist (EPHRUSSI et al. 1955). They can be induced by means of specific mutagenic agents, such as the acridine dyes (E...

Wilcox, Wesley C. (University of Pennsylvania, Philadelphia) and Harold S. Ginsberg. Effect of proflavine on the synthesis of adenovirus, type 5, and associated soluble antigens. J. Bacteriol. 84:526-533. 1962.-The synthesis of type 5 adenovirus in HeLa cells was suppressed to a considerable extent by low concentrations of proflavine, an acridine dye. In comparison, the processes leading to the...

Freezing-thawing effects on the nuclei of porcine and human spermatozoa were studied by determining native DNA percentage from fluorescence after acridine orange (AO) staining and by analyzing chromatin structure by a quantitative microspectrophotometric study of Feulgen-DNA complexes before and after freezing. The study of boar spermatozoa revealed no alteration in native DNA percentage after ...