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Biomedical subjects

G Berg

Publications and source records attributed to G Berg.

388 records · Page 22Linked to original sources
PubMedDate not supplied

Bacterial conjugation between Escherichia coli and Pseudomonas spp. donor and recipient cells in soil.

Experiments conducted in microcosms containing loam soil samples inoculated with either E. coli or Pseudomonas spp. donor and recipient cells showed that bacterial cells survived and conjugated over a 24-h incubation period. E. coli transconjugants were detected 6 h after donor and recipient strains were introduced into sterile soil samples. In non-sterile soil samples, transconjugants were detected between 8 and 24 h incubation. Pseudomonas transconjugants were recovered from sterile soil samples between 6 and 12 h after their introduction and as early as 2 h in non-sterile soil. The results show that genetic interactions occur in non-sterile soil in relatively short periods of time at relatively high transfer frequencies (10(-3) to 10(-4]. Studies on genetic interactions in soil are becoming necessary in risk assessment/environmental impact studies prior to the release of genetically engineered or modified organisms into uncontained environments.

Conjugation, Genetic↗
PubMedDate not supplied

[Prevention of anemia in the first year of life in health centers of Santo André, São Paulo].

The aim of this study was to evaluate the efficacy of an iron prophylactic supplementation program, in three health centers of Santo André, in São Paulo state. The prevalence of anemia was identified in a control group consisting of 201 children of 1 year old. The intervention group consisted of 308 children younger than 3 months, but 55% of them gave up during the survey. The mothers were instructed to give them daily prophylactic doses of iron sulfate (6 mg of iron/day) when they were 4 or 6 months old, according to the kind of breast-feeding. The mothers were also instructed about feeding and anemia and its risk to children's health. When the children were 12 months old, the diagnosis of anemia was made through dosage of hemoglobin concentration and the results were compared with those of the control group. It was verified that the 2 groups presented similar prevalences. It is important to realize that children with low frequency of visits to the health centers had prevalence of anemia significantly higher than those with high frequency. Some factors that possibly contributed to the result of the intervention are discussed.

English Abstract↗