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Biomedical subjects

E Schmidt

Publications and source records attributed to E Schmidt.

At least 487 records · Page 27Linked to original sources
PubMedDate not supplied

Toxicity of chlorobenzene on Pseudomonas sp. strain RHO1, a chlorobenzene-degrading strain.

Pseudomonas sp. strain RHO1 able to use chloro- and 1,4-dichlorobenzene as growth substrates was tested towards sensitivity against chlorobenzene. Concentrations of chlorobenzene higher than 3.5 mM were found to be toxic to cells independent of pregrowth with chlorobenzene or nutrient broth. Below this concentration, sensitivity towards chlorobenzene depended on the precultivation of the cells, i.e. type of growth substrate (chlorobenzene or nutrient broth) and the concentration of chlorobenzene as the growth substrate. Cells grown in continuous culture were especially sensitive with a threshold concentration of 2.5 mM chlorobenzene. In addition to chlorobenzene, metabolites also seem to function as toxic compounds. 2-Chlorophenol and 3-chlorocatechol were isolated from cell extracts. Cleavage of 3-chlorocatechol by catechol 1,2-dioxygenase seems to be the critical step in the metabolism of chlorobenzene.

Biodegradation, Environmental↗
PubMedDate not supplied

[Decreased prothrombin coagulation activities in breast-fed children?].

Intracranial bleeding due to vitamin K deficiency in infants without prior symptoms of disease has been reported. All of these children were fully breastfed. To evaluate a potential deficit of vitamin K dependent coagulation factors in fully breastfed infants we determined the prothrombin clotting times in healthy babies on the 5th day (n = 204) and in the 5th week of life and correlated the results to the feeding. On the fifth day of life prothrombin coagulation times in fully breastfed infants were significantly longer than in babies receiving formula exclusively or additionally. Vitamin K supply in fully breastfed neonates should therefore be reinvestigated. In the 5th week of life, however, there was no difference in prothrombin coagulation times between fully breastfed infants and infants with exclusive or supplementary formula feeding.

Breast Feeding↗