1887

Abstract

SUMMARY: By direct observation of individual organisms in a micro-culture chamber and by viable plate counts, a study has been made of the function of sugar/colloid mixtures in promoting the survival of Gram-negative bacteria on drying. The high death rate after drying in sugar alone was due mainly to cell-wall damage caused during rehydration by the temporary osmotic pressure set up by the sugar within the cell, leading to the formation of spheroplasts not capable of division. Spheroplast formation was largely prevented and survival greatly enhanced by controlled rehydration, showing that the sugar component was the primary protective agent. The complementary role of the protein or ‘protective colloid’ appears to lie in its ability to compress the cell wall against the contracted plasma membrane in plasmolysed cells, thus decreasing the volume of the interspace between the two membranes and so limiting the sugar trapped therein to a safe amount. These observations were corroborated by cell volume measurements in the ultracentrifuge.

Loading

Article metrics loading...

/content/journal/micro/10.1099/00221287-28-4-585
1962-09-01
2019-10-22
Loading full text...

Full text loading...

http://instance.metastore.ingenta.com/content/journal/micro/10.1099/00221287-28-4-585
Loading
This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error