Based upon a broad spectrum of intensive and conclusive research carried out during the past few decades, in fact, have resulted in the accumulation of an array of vital and important ‘additional informations’ with regard to the proper ‘identification of the bacterium’.
CULTURAL
CHARACTERISTICS
Based
upon a broad spectrum of intensive and conclusive research carried out during
the past few decades, in fact, have resulted in the accumulation of an array of
vital and important ‘additional informations’ with regard to the proper ‘identification of the bacterium’.
However, the various cul-tural characteristic features that have been brought
to light in different kinds of media are duly observed. Importantly, during the
investigative studies one may
critically note the following features emerging as very specific colonies upon the solid media, namely :
Shape : irregular, circular, or rhizoid
;
Size : usually expressed in millimeters
(mm) ;
Elevation : elevated, convex, concave, umbonate
or umbilicate, or effuse ;
Margins : bevelled, or otherwise ;
Surface : wavy, rough, smooth, granular,
papillate, or glistening ;
Edges : entire, undulate, crenated,
curled, or fimbriate ;
Colour : variation in different colour
intensities ;
Structure : transparent, translucent or
opaque ;
Consistency : butyrous, membranous, friable or
viscid ;
Emulsifiability : good, mediocre, poor, or best ;
and
Differentiation : into a central and a peripheral
portion.
It is,
however, pertinent to state here that there exist a notable variation amongst
the stroke culture, such as :
(a) Degree of Growth : These
are invariably of three strengths viz., scarce, intermediate, or excessive
;
(b) Nature of Growth : These
could be either discrete or confluent, filiform*,
spreading, or rhizoid ; and
(c) Physical Characteristics : These
essentially include a wide variety of such physical
char-acteristic features as : surface, elevation, edges, colour, structure,
odour, emulsifiability, consistency, and
the overall critical changes observed in the ensuing medium.
It is
pertinent to mention at this point in time that in a particular fluid (or liquid) medium one may
obviously take cognizance of the following characteristic features, namely :
·
extent of growth,
·
presence of turbidity plus its nature,
·
presence of deposit and its character,
·
nature of surface growth e.g., pellicle* and its
observed quality, and
·
ease of disintegration, and colouration.
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