Journal of bacteriology . owthbeing very sparse and taking about a month or two to developat all. We have withheld the report on this organism for manymonths because we have been unable to obtain it in pure cul-ture. Unless chance favors our efforts more than heretofore, itmay take a year or two to achieve this, and perhaps we may loseand recover it several times before this result is obtained. Weventure to make this brief report now, therefore, since manyinvestigators are studying the cultivation of Treponema pallidumfrom rabbits and we have not seen any mention of a microor-ganism of this ki
Journal of bacteriology . owthbeing very sparse and taking about a month or two to developat all. We have withheld the report on this organism for manymonths because we have been unable to obtain it in pure cul-ture. Unless chance favors our efforts more than heretofore, itmay take a year or two to achieve this, and perhaps we may loseand recover it several times before this result is obtained. Weventure to make this brief report now, therefore, since manyinvestigators are studying the cultivation of Treponema pallidumfrom rabbits and we have not seen any mention of a microor-ganism of this kind, so easily differentiated morphologically fromT. pallidum, yet appearing in rabbits in the same locationand under the same conditions. Knowledge of its occurrence and its limitation, so far in ourexperience, to cultures from syphilitic testis should be of valueto others working in this field. Should it eventually prove to bea hitherto undescribed species, we would suggest as a suitablename for it ^^ Treponema rigidum.^. Dark Field Photo-micrographs of Non-motile Treponema found IN Testes of Enetic Rabbits492 STUDIES ON AEROBIC SPORE-BEARING NON-PATHOGENIC BACTERIA Part II From the Laboratory of Hygiene and Bacteriology, Johns Hopkins UniversitySPORE-BEARING BACTERIA IN DUST BY C. A. LAUBACH Spore-bearing organisms from dust were obtained by rubbingmoist sterile swabs over various dust-laden surfaces, transfer-ring the material thus obtained to melted agar and then heatingto 90°C. for fifteen minutes to destroy all non-sporulating bac-teria. Plates were then poured in the usual way and differentcolonies selected for study and identification. In many in-stances the cultures had to be replated a number of times beforethe purity of the strain was established, so closely do the sporesadhere to each other. In general the most prolific source ofthe spore-bearing organisms was dust which had lain undisturbedfor long periods of time as in closets or on high shelves. Dustparticles ci
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