Studies of Aerosols with a Simple Cloud-Chamber Technic1

Abstract

A key based on paper chromatography and bioautography is proposed for differentiating most of the gram positive inhibiting antibiotics produced by Bacillus, as well as polypeptidic antibiotics produced by other microorganisms.

The Nature and Composition of Experimental Bacterial Aerosols1

“…I Griffin et al, 1956, using a different strain of S. mnarcescens dispersed from 0.85 per cent NaCl (no other materials in the fluid) at 30 per cent relative humidity reported a death rate 10 times that shown here, and an identical value at the higher humidity.…”

“…For the study of the physical characteristics of bacterial aerosols, a more complicated chamber system is required. Numerous chambers for the study of air-borne bacteria have been developed by other workers (Berry et al, 1949;Bourdillon et al, 1948;De Ome et al, 1944;Druett and May, 1952;Ferry and Maple, 1954;Griffin et al, 1956;Henderson, 1952;Kaye, 1949;Laurell et al, 1949;Leif and Krueger, 1950;Mackay, 1952;Phelps, 1942;Rentschler, 1942;Robertson et al, 1946;Rosebury, 1947;Twort et al, 1940;Urban, 1954;Weiss and Stegeler, 1952;Wells, 1955). However, none of these embodied all the desired features for the study of the nature and composition of bacterial aerosols.…”

Studies of the loss of viability of stored bacterial aerosols. II. Death rates of several non-pathogenic organisms in relation to biological and structural characteristics

“…Since static storage for less than 3 min. is inconvenient for us, it may be desirable either further to modify the system or to use the simple device described by Griffin et al (1956) for this intermediate period.…”

The Possibility of Using B Prodigiosum as an Experimental Bacterial Aerosol Model

“…However, in the literature of recent years reports have started to appear more often concerning the weak stability of this microbe in the droplet phase of an aerosol. The death of this microorganism sets in particularly rapidly at low indices of relative air humidity (Thomas, 1955;Griffin et al, 1956;Vlodavets, 1957Vlodavets, , 1962Webb, I?59). Therefore, we undertook a special study of the stability of B. prodigiosum (strain No.…”