Svihla, G. (Argonne National Laboratory, Argonne, Ill.), J. L. Dainko, and F. Schlenk. Ultraviolet microscopy of purine compounds in the yeast vacuole. J. Bacteriol. 85:399-409. 1962.-Yeast cells (Candida utilis and Saccharomyces cerevisiae) suspended in nitrogen-free medium were exposed to various ultraviolet-absorbing biological compounds, particularly nucleic acid constituents. Ultraviolet p...

Dating of the tetracycline biomarker in a tooth section of a black bear (Ursus americanus) can be accomplished by noting its position relative to that of the cementum annuli which indicate age. However, annuli and biomarkers are best demonstrated by different laboratory techniques. The technique used for the biomarker, calcified sections examined using epi-fluorescence microscopy, does not clea...

The results showed that Pileolaria terebinthi, type species of the genus Pileolaria is not a hemi–form or brachy–form rust species as mentioned among literature by several authors. Study on miscellaneous specimens collected from Iran and locus classicus of the species, France, revealed that P. terebinthi is an automacrocyclic rust and its aecial state is not uredinioi...

Abstract Cow milk is a highly nutritious food but many factors predispose it to microbial contamination. There paucity of information on antifungal-resistant pathogens. Hence the study investigated fungi from fresh cow samples and their resistance some antifungals. Twenty-seven (27) were isolated forty-three ( n =43) PDA (Potato dextrose agar) media, re-cultured in glucose yeast extract broth, ...

A new preparation for the study of cell spreading and locomotion was investigated, using time-lapse cinemicrography and photomicrography. The preparation of limpet haemocytes has the advantage of being a natural one, not derived by tissue dissociation, and is functional at normal laboratory temperatures. The commonest cell type, the amoebocytes, have numerous spikes, up to 15 /im in length, whi...

The hydrodynamics and energetics of helical swimming by the bacterium Spirillum sp. is analysed using observations from medium speed cine photomicrography and theory. The photographic records show that the swimming organism's flagellar bundles beat in a helical fashion just as other bacterial flagella do. The data are analysed according to the rotational resistive theory of Chwang & Wu (1971) i...

PURPOSE To establish the in vitro action spectrum for acute UV cataractogenesis using whole cultured lenses. The recovery pattern of the induced cataract was also investigated. METHODS Aseptically dissected porcine lenses were cultured in glass chambers. At 1 week, lenses were exposed to a predetermined UV energy (J/cm(2)) at specific wavebands ranging from 270 to 370 nm at 5- and 10-nm inter...