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[Ultrastructural characteristics of Proteus vulgaris and Proteus mirabilis cells differing in the capacity for
Abstract:
Specific differences in the structure of colonies and the location of microbial cells in colonies, characteristic for aggregating and nonaggregating genetically related pairs of P. vulgaris and P. mirabilis strains, have been demonstrated by means of transmission and scanning electron microscopy. In calculating the number of flagellae per 100 outlines of microbial bodies revealed in negatively stained preparations, the fact that both aggregating and nonaggregating bacteria possess practically the same number of flagellae, on the average 4-8 flagellae per microbial cell outline, has been established. This fact indicates that the presence of flagellae in microbial cells is unrelated to their capacity for swarming.
Insights
Microbial cell structure and location differ between aggregating and non-aggregating Proteus strains. Bacterial flagella number is not linked to swarming ability in these Proteus species.
Area of Science:
- Microbiology
- Microbial Genetics
Background:
- Proteus vulgaris and Proteus mirabilis are genetically related bacterial species.
- Bacterial swarming is a complex motility phenomenon influenced by various factors.
Purpose of the Study:
- To investigate structural differences in colonies between aggregating and non-aggregating strains of P. vulgaris and P. mirabilis.
- To determine the relationship between flagellation and swarming behavior in these bacteria.
Main Methods:
- Transmission and scanning electron microscopy were used to examine colony structure and microbial cell location.
- Flagella counts were performed on negatively stained preparations of bacterial cells.
Main Results:
- Distinct differences in colony structure and microbial cell arrangement were observed between aggregating and non-aggregating strains.
- Both aggregating and non-aggregating bacteria exhibited a similar average number of flagella (4-8 per cell outline).
Conclusions:
- Colony architecture and cell positioning are key differentiators for swarming phenotypes in Proteus species.
- Bacterial flagella are not a determining factor for the swarming capacity in P. vulgaris and P. mirabilis.