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Publication:
The Chinese Journal of Dental Research

Year 2003
Volume 6 , Issue 1

Back
Pages: 54 - 57

The Threshold Value Study for the Conversion of Mercury by Mutans Streptococcus

Jun Wang/Zheng Liu

Objective: To observe if there is a threshold value for mercury conversion by mutans streptococcus from inorganic to organic mercury. Methods: Eight isolated mutans streptococcus strains were used throughout the study. Serial concentrations of mercury in water were added to tubes containing a bacteria solution and incubated for 24 hours, then concentrations of organic and inorganic mercury were measured. A tube containing mutans streptococcus without mercury in water served as the positive control; a tube without mutans streptococcus but with mercury in water served as the negative control. Results: When the inorganic mercury concentration in the mutans streptococcus solution was lower that 0.0167 g/ml, mutans streptococcus was barely capable of converting inorganic mercury to organic mercury; when the mercury concentration reached 0.033 g/ml or more, mutans streptococcus was able to convert some inorganic mercury into organic mercury. Conclusion: It was demonstrated that there was a threshold value for mercury conversion by mutans streptococcus.

 

 

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