Colony Morphology and Growth Patterns of Bacteria

size

___ is simply a measurement of the colony's dimensions--the diameter if circular or length and width if shaped otherwise

round; irregular; punctiform

shape may be described as ___ (circular), ___, or ___ (tiny, pinpoint)

entire; undulate; lobate; filamentous; rhizoid

the margin may be ___ (smooth, with no irregularities), ___ (wavy), ___ (lobed), ___ (unbranched strands), or ___ (branched like roots)

smooth; rough; wrinkled; shiny; dull

the surface may be ___, ___, ___ (rugose), ___, or ___

moist; mucoid; butyrous; dry

the texture may be ___, ___ (sticky), ___ (buttery), or ___

flat; raised; convex; pulvinate; umbonate

elevations include ___, ___, ___, ___ (Very convex), and ___ (raised in the center)

color; opaque; translucent

other useful features include ___ and optical properties such as ___ (you can't see through it) and ___ (light passes through)

incubation time and temperature

two factors affecting growth irrespective of nutrients in media: ___ ___ and ___

waste; stress

some organisms are slow growing and need more time to produce colonies. however, excessive growth time, especially in an incubator can lead to a loss of nutrients and a buildup of ___ in the media. this can lead to dramatic changes in the organisms on the plate. some may change shape due to ___, others may create new project-like filaments in an effort to search for nutrients beyond the reach of their colony. overall, excessive growth time is damaging to the organism and often results in detrimental changes to colony shape and bacteria survivability

swarming

Genus Proteus has a characteristic movement on solid media. this movement is known as ___

filiform

growth patterns on slants:

-many organisms you will see in this class produce ___ growth (dense and opaque with a smooth edge), but you will see differences in other features.

friable; opaque; translucent; smooth; lobed

growth on slants can vary in texture (e.g., moist or ___ [dry, crusty]), optical properties (e.g. ___, ___), and margin (e.g. ___, ___ spreading/effuse, filamentous, rhizoid), or ___ [spiny])

pellicle; sediment; uniform fine turbidity; flocculent

microorganisms cultivated in broth display a variety of growth characteristics. some organismsfloat on top of the medium and produce a type of surface membrane called a ___. others sink to the bottom as ___. some bacteria produce ___ ___ ___, and others appear to clump in what is called ___ growth. others show pigmentation or form a ring at the surface

round

shape?

irregular

shape?

punctiform

shape?

filamentous

shape?

rhizoid

shape?

entire (smooth)

margin?

undulate (wavy)

margin?

lobate

margin?

filamentous

margin?

convex

elevation?

umbonate

elevation?

filiform (straight) and translucent

1st one

friable and opaque

2nd one

effuse and translucent

3rd one

echinulate and opaque

4th one

rhizoid and opaque

5th one

uniform fine turbidity

1st one

flocculent growth

2nd one

pellicle and sediment

3rd one