Microorganism in the Environment Flashcards
Bacteria reproduce by splitting into two is known as
binary fission
one kind of bacteria in a culture media
pure culture
culture media selective to grow specific organism
selective media
indicators that they are producing acids/alkalines
dyes
is useful in isolation and differentiation of the various gram-negative bacilli and enteric bacilli, generally known as coliforms and fecal coliforms respectively.
acyl methylene blue agar
Invasion of a host by a microorganism with subsequent establishment and multiplication of the agent.
infection
accidental transfers of organisms from one natural environment to another.
contamination
Sources of infectious agents / contaminants are humans, animals and non-living materials.
contamination
is an individual mass of bacterial growth on the surface of the agar.
colony
All the bacteria in a ____came from one single bacteria, and thus all are identical to one another.
colony
when grown on a medium, shows specific growth appearance or characteristics.
bacterium
It varies with the type of agar/broth medium, nutrients, and dyes present in the medium
colony
different forms of bacteria
punctiform
circular
irregular
filamentous
rhizodal
identify different forms of bacteria
+1
margins of bacteria
entire
lobate
filamentous
curled
undulate
identify margins of bacteria
+1
elevation of colony
flat
raise
convex
umbunate
crateriform
pulvinate
identify elevation of colony
+1
surface of colony
smooth
concentric
contoured
wrinkled
identify surface of colony
+1
pigmentation can be
pigmented
nonpigmented
optical features of colony
transparent
opaque
translucent
opalescent
consistency of colony
dry
brittle
buttery/butyrous
viscid/muscoid
The most rapid cell growth occurs at the colony ___ where larger amount of required resources are available
edge
Growth is much slower in the ___, and cell autolysis takes place in the older central portions of some colonies
center
takes place in the older central portions of some colonies.
cell autolysis
bacillus subtilis development identify
+1
Staphylococcus aureus
+1
e coli
+1
Micrococcus luteus
+1
Pink color of bacteria indicates a
lactose fermenter
used for the isolation of gram-negative enteric bacteria and the differentiation of lactose fermenting from lactose non- fermenting gram-negative bacteria
MacConkey’s Agar
s a growth media for the culturing of moderately to non fastidious bacteria
Trypticase Soy Agar
pseudomonas aeruginosa
+1
It is often a nosocomial pathogen, easily transmitted by hands and invasive medical procedures
pseudomonas aeruginosa
Temperature-regulated phenotypic expression
- the red pigment ___ is produced in response to incubation at 30o C, but do not do so at 37o C.
prodigiosin
serratia marcescens
+1
the ability to cause disease.
pathogenicity
The ability of an organism to invade host tissues and cause disease
virulence
Colonies that are smooth and viscid due to their
capsules
evade phagocytosis and therefore can wander in our body without being detected by macrophages
capsules
capsule production of B. anthracis
poly-d-glutamate
