What controls the phase diagram and superconductivity in Ru-substituted BaFe2As2?

We use high resolution angle-resolved photoemission to study the electronic structure of the iron based high-temperature superconductors Ba(Fe(1-x)Ru(x))(2)As(2) as a function of Ru concentration. We find that substitution of Ru for Fe is isoelectronic, i.e.

Dietary intake of Al, Ca, Cu, Fe, Pb, and Zn in infants.

The dietary intake of six elements--Al, Ca, Cu, Fe, Pb, and Zn--was measured in 39 normal healthy children aged 17-61 (mean 35.5) weeks. There was a downward trend with age in daily intake of fluid, Pb and Fe, in contrast to an increase in solid intake, Ca and Zn throughout the study.

Temporal trends in urban and rural blood lead concentrations.

A long term programme to assess the impact of reduced lead emissions in the UK has been established in central London and rural Suffolk. Blood lead concentrations of 5 and 6 year old children and their mothers both show an urban-rural difference of about 1.5 μg/dl, which is related to the urban-rural differences in air and dust lead concentrations between areas.

Blood lead concentrations and lead intake in children of different ethnic origin.

Factors affecting blood lead concentrations in three groups of children of different ethnic origin have been investigated. Dietary lead intakes were similar for the three groups, the average lead intakes lay in the range 110-150 micrograms/week. Blood lead concentrations were not related to ethnic origin when the effect of other factors was allowed for.

Perinatal lead and cadmium burden in a British urban population.

Concentrations of the potential pollutants, lead and cadmium, were studied in the perinatal period in a British urban population. Blood lead and cadmium concentrations and iron status were measured in 28 mother and infant pairs at delivery and at five days postpartum in the mother; breast milk collected at five days postpartum under controlled conditions was analysed for lead and cadmium. Placental transfer of both metals was noted; concentrations of lead in breast milk (mean concentration 0.

Absorption of lead from dust and soil.

The lead burdens for children and mothers exposed to lead-contaminated soils and dusts have been investigated in a rural district with minimal atmospheric pollution. A significant relationship was observed between the lead content of blood and hair of children exposed to soils of mean lead content in the range 420-13,969 p.p.

Significance of high soil lead concentrations for childhood lead burdens.

The lead exposure of children and their mothers has been studied in two towns with mean soil lead contents of 900 and 400 ppm. No significant difference in blood or fecal lead contents was demonstrated between the two populations, but a small difference in hair lead content was shown. The blood lead content of children was greater than that of their mothers and was higher in the summer than in the spring samples.

Follow-up of children overexposed to lead.

The purpose of this study is to assess the nature and magnitude of the deleterious health effects of subclinical over-exposure to lead in children. The study stems from concerns about the impact on the health of children in city slums who ingest leaded paint without overt evidence of poisoning and the health implication of rising levels of lead in the environment from automotive emissions. The study sample was derived mainly from a registry of children on whom blood lead determinations had been made by the New York City Department of Health and was supplemented by siblings of the registry cases and children from a lead belt area who had extractions of deciduous teeth in dental clinics.