Luminous Bacterial Auxanograms in Relation to Heavy Metals and Narcotics, Self-Photographed in Color

Abstract

This study was undertaken with a threefold objective: first, to compare the effects of some diverse bactericidal and bacteriostatic agents, including metal cations, sulfonamide compounds, and narcotics, on the growth and luminescence of luminous bacteria; second, to obtain self-photographs in color showing the chief results; and third, in connection with the photographs, to measure the brightness of the light and express it in absolute units.

Cobalt and Bacterial Growth, With Special Reference to Proteus Vulgaris

“…Interest in cobalt as a growth inhibitor of microorganisms has been extremely limited. Such studies as have been made deal primarily with the concentrations of the metal necessary to kill the cells of bacteria, yeast, or paramecia after a given period of exposure (Bokorny, 1905(Bokorny, , 1913Krauss and Collier, 1931;Johnson, Carver, and Harryman, 1942). Apart from observations on the therapeutic use of cobalt in the treatment of tuberculosis (Renon, 1915;Rondoni, 1920;Mascherpa, 1929), no attempt, so far as we are aware, has been made to study in detail the nature of the action of cobalt on bacteria.…”