bon soir,
voila,la question conserne le milieu de culture SFB,
SVP est ce que vous pouvez me dire SFB c'est l'abréviation de quoi? j'aimerai bien avoir la composition de ce milieu
il permet la culture de quel germe?
merci en avance.
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08/05/2008, 02h46
#2
invitec9f0f895
Date d'inscription
janvier 1970
Messages
15 581
Re : milieu de culture
salut
tu es sur que c'est un milieu conventionnel? tu t'en sert dans le cadre de quoi?
YOyo
08/05/2008, 23h20
#3
invitec3b4c604
Date d'inscription
janvier 1970
Messages
52
Re : milieu de culture
bon soir,
dans le protocole du TP est ecrit que le milieu SFB est utilisé pour l'enrichissement des salmonelles et shigelles,et c'est tout,
c'est pour ça je cherche le nom exact du milieu, sa composition et est ce qu'il permet l'enrichissement de d'autre germe?
merci
Je sers la science et c'est ma joie.... Il parait.
09/05/2008, 01h30
#6
inviteb6144ea4
Date d'inscription
janvier 1970
Messages
381
Re : milieu de culture
Bonjour,
effectivement Piwi a tapé juste: SFB c'est bien Selenite F Broth
C'est bien un milieu d‘enrichissement pour l‘isolation de Salmonella/Shigella dans les féces, l‘urine, l‘eau, les aliments et autres matériels d‘importance
sanitaire.
Voilà les infos que j'ai trouvé sur le catalogue d'un fabricant:
Summary and Explanation
Selenite Broth was devised by Leifson, who demonstrated that
selenite was inhibitory for coliforms and certain other microbial
species, such as fecal streptococci, present in fecal specimens
and, thus, was beneficial in the recovery of Salmonella species.
He found that the inhibited strains would eventually break
through, but if subcultures were made from the enrichment
broth after 8-12 hours of incubation, the isolation of Salmonella
was possible without overwhelming growth of many members
of the intestinal flora.
Enrichment media are routinely employed for detection
of pathogens in fecal specimens since the pathogens usually
represent only a small percentage of the intestinal flora.
Selenite Broth and the related medium, Selenite Cystine Broth,
are recommended for use in the recovery of Salmonella with
subcultures being made after 12-18 hours of incubation. For
detection of Shigella, GN Broth is a satisfactory enrichment
medium. Campylobacter Thioglycollate Medium with 5
Antimicrobics is recommended for specimens suspected to
contain Campylobacter jejuni.
Principles of the Procedure
The peptone provides essential nitrogenous and carbon compounds.
The lactose in the medium serves to maintain a uniform
pH. When selenite is reduced by the growth of bacteria, alkali
is produced, and such increase in pH would lessen the toxicity
of the selenite and result in overgrowth of extraneous bacteria.
The acid produced by lactose fermentation serves to maintain
a neutral or slightly decreased pH. The function of the phosphate
is two-fold; it serves to maintain a stable pH and lessens the
toxicity of the selenite, thus increasing the capacity of the medium.
Sodium selenite inhibits many species of gram-positive and
gram-negative bacteria including enterococci and coliforms.
Formula
Difco™ Selenite Broth
Approximate Formula* Per Liter
Pancreatic Digest of Casein .............................. .......... 5.0 g
Lactose .............................. .............................. ........... 4.0 g
Sodium Selenite .............................. ........................... 4.0 g
Sodium Phosphate .............................. ................10.0 g