EFFECTS OF CHANGES IN Mg++ ION CONCENTRATION UPON BACTERIAL INHIBITION BY β‐2‐THIENYLALANINE IN DEFINED MEDIA
- 1 August 1978
- journal article
- research article
- Published by Wiley in Immunology & Cell Biology
- Vol. 56 (4) , 507-511
- https://doi.org/10.1038/icb.1978.57
Abstract
Variation in the inhibition of growth of Escherichia coli and Shigella sp. in various media containing -2-thienylalanine was attributed to differences in concentrations of Mg++ ions. Random blood samples from 112 infants were tested for elevated phenylalanine in the phenylketonuria (PKU) screening assay. Magnesium ion levels also affected the results of this assay. At 005 g/l MgS04, the concentration present in commercial PKU test agar, four false positives were detected, while no readings could be made due to overgrowth of the Bacillus subtilis test strain when the concentration was increased to 01 g/l.Keywords
This publication has 3 references indexed in Scilit:
- Differentiation of pathogenic, gram-negative, bacterial genera in the presence of β-2-thienylalanineCanadian Journal of Microbiology, 1976
- THE EFFECTS OF PHENYLALANINE ANALOGUES ON THE METABOLISM OF PHENYLALANINE IN RATSCanadian Journal of Biochemistry, 1967
- MUTANTS OF ESCHERICHIA COLI REQUIRING METHIONINE OR VITAMIN B 12Journal of Bacteriology, 1950