Shape and classification
The bacterium has a rod shaped structure.Gram classification
16S rRNA gene identification
''Selenomonas ruminantium'' was originally placed with the Gram-positiveFlagellar basal test
The observation of flagella under electron microscope revealed the presence of four rings, a typical sign of gram negative species. Observation of the flagellar basal structure confirms that ''S. ruminantium'' has an outer membrane, a characteristic of Gram-negative bacteria . Gram-positive outer membranes or mycomembranes were recently reported for the Gram-positive general ''Corynebacterium'' and ''Mycobacterium'', but none of them have flagella.Tuft flagella
The tuft of flagella is seen arising from the concave of basal body of ''S.ruminantium.'' The movement is achieved by self rotation about the axis of the body by the rotational force exerted by the tuft at the centre. If the polar region to midpoint distance is considered as 50% the tuft is located at the midpoint represented as 50% of the organism.Lateral flagella
The bacteria also exhibits polar or lateral flagellar structures depending upon the medium in which they are developed.Polymorphism in flagellar structures
Their flagella exhibits polymorphic properties depending upon the environment of the bacteria. Generally the flagellae protruding from all points are clustered around the midpoint. Flagellin is glycosylated.pH effect on the structure of flagella
The bacterial flagella's existence depends upon the pH. The rumen pH is about 5.5 to 7.Mobility
Glucose effect
The medium of development determines the motility of the bacteria. For ''Selenomonas ruminantium'', glucose suppresses the flagellation.Swimming
The microbe swims by self rotation about the axis of the body unlike its nearest appropriate comparison ''Hooks
The shape and size of the hooks on the flagellae differ by the physiological conditions present, but the general structure is S shaped.References
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