differences between bacteria (2)
100674.1442 at CompuServe.COM
Mon Sep 18 15:42:43 EST 1995
In contrast to EC and SL, SH is non-motile (means has no
flagellae); EC can metabolize lactose (lactose+, yellow with acid
indicator) in most cases, SL and SH cannot (lactose-). SL can
reduce sodium-sulfite (H2S+, black with bismut-citrate
ER is also considered to be an "enterobacteriacea", but is a
plant pathogen; AZ is a soil germ.
VC is a water-borne germ as well, shedded through intestinal
tract of e.g. mammals and may reside in e.g. sea-food; it is - in
contrast to all others in your list - no (straight) rod, but a
LP is a water-borne germ, which survives best intracellularly (in
amoeba (water) or human macrophages (lung)), also- in contrast to
all others - at higher temperatures (40 - 50 C).
HI is an organism, which requires hemin from erythrocytes for
growth; it therefore will never survive in the environment; it is
- besides LP - the only microaerophilic (means requires CO2
enriched culture) in your list, all other are aerobs (it looks
strange in your list of possible environmental isolates).
For isolation of mentioned bacteria, you may need to pretreat the
specimens (enrichment or selective media). SL,EC,SH,HI grow best
at 36-37C, at pH 7.2; HI needs hemin and CO2.
LP needs charcoal, iron- and cystein-supplemented agar (e.g.
BCYE-agar) at pH6.9. VC is best cultivated in an alcaline peptone
bouillon (pH 8.5). Good luck
Karlsruhe - Germany
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