PMID- 1939833
OWN - NLM
STAT- MEDLINE
DCOM- 19911211
LR  - 20170214
IS  - 0022-0345 (Print)
IS  - 0022-0345 (Linking)
VI  - 70
IP  - 10
DP  - 1991 Oct
TI  - Enumeration of oral streptococci on media containing different concentrations of 
      sodium and potassium ions.
PG  - 1375-9
AB  - Laboratory "type" strains of oral streptococci were screened for their ability to 
      grow on mitis-salivarius agar (MSA) in the presence of increasing concentrations 
      of either Na+ or K+ up to 500 mmol/L. Strains were generally better able to 
      withstand increasing concentrations of Na+ than K+, although low numbers of 
      colony-forming units (cfus) were seen with the highest concentration of either 
      cation. Two strains of Streptococcus mutans, Ingbritt 162 and Ingbritt 175, 
      behaved differently when the concentration of cation was increased from 50 to 200 
      mmol/L; the latter showed a marked increase in the number of cfus when the Na+ 
      concentration was increased from 50 to 200 mmol/L, whereas there was a decrease 
      with strain Ingbritt 162. Strains of oral streptococci from the saliva of adults 
      and children were isolated on modified MSA containing known concentrations of Na+ 
      and K+ and further examined if they showed "mutans-like" colony morphology. The 
      number of cfus generally dropped as the concentration of Na+ or K+ was increased 
      from 200 to 350 or 500 mmol/L. Greater numbers of streptococci were tolerant to 
      Na+ than to K+. Half of the isolates were members of the Streptococcus sanguis 
      group (SSG), either Streptococcus mitis or S. sanguis II, and these were more 
      tolerant to high concentrations of Na+ or K+ than other isolates that were 
      identified as Streptococcus morbillorum, Streptococcus acidominimus, and 
      Streptococcus milleri.
FAU - Willcox, M D
AU  - Willcox MD
AD  - Institute of Dental Research, Surry Hills, N.S.W., Australia.
FAU - Irwin, A M
AU  - Irwin AM
FAU - Jacques, N A
AU  - Jacques NA
FAU - Knox, K W
AU  - Knox KW
LA  - eng
PT  - Comparative Study
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - J Dent Res
JT  - Journal of dental research
JID - 0354343
RN  - 0 (Culture Media)
RN  - 9NEZ333N27 (Sodium)
RN  - RWP5GA015D (Potassium)
SB  - IM
MH  - Adult
MH  - Child
MH  - Colony Count, Microbial
MH  - Culture Media
MH  - Dose-Response Relationship, Drug
MH  - Humans
MH  - Mouth/*microbiology
MH  - Potassium/pharmacology
MH  - Saliva/microbiology
MH  - Sodium/pharmacology
MH  - Streptococcus/drug effects/*growth & development/isolation & purification
EDAT- 1991/10/01 00:00
MHDA- 1991/10/01 00:01
CRDT- 1991/10/01 00:00
PHST- 1991/10/01 00:00 [pubmed]
PHST- 1991/10/01 00:01 [medline]
PHST- 1991/10/01 00:00 [entrez]
AID - 10.1177/00220345910700101201 [doi]
PST - ppublish
SO  - J Dent Res. 1991 Oct;70(10):1375-9. doi: 10.1177/00220345910700101201.