The diversity and richness of species are of important components to evaluate the health of ecologic system of rangelands. This research was conducted to investigate the biodiversity in riparian and neighboring areas via comparison of indices in Javaherdeh rangeland of Ramsar. Plot-transects was randomly used to estimate diversity, richness, dominance, and evenness indices in two regions. Multi...

OBJECTIVE This study sought to determine whether neighborhood poverty modifies the relationship between maternal age and infant birth weight among urban African Americans. DESIGN Stratified analyses were performed on the vital records of African Americans born in Chicago by means of 1992-1995 computerized birth file with appended 1990 US Census income and 1995 Chicago Department of Public Hea...

Magnesium is a biologically active mineral found in foods rich in whole grains, green leafy vegetables, and nuts. In westernized populations such as in the United States, magnesium intake is known to be inadequate (1). In experimental studies of animals, magnesium deficiency was shown to accelerate atherosclerosis and magnesium supplementation suppressed its development (2, 3). Epidemiologic ob...

BACKGROUND Few studies have investigated the association between radon and thyroid cancer despite the sensitivity of the thyroid gland to radiation. Our goal is to investigate the association between county-level radon and incidence of female thyroid cancer in the US States of Iowa, New Jersey, and Wisconsin. METHODS Thyroid cancer incidence data were provided by individual state cancer regis...

BACKGROUND Toxic metals including arsenic, cadmium, manganese, and lead are known human developmental toxicants that are able to cross the placental barrier from mother to fetus. In this population-based study, we assess the association between metal concentrations in private well water and birth defect prevalence in North Carolina. METHODS A semi-ecologic study was conducted including 20,151...