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Articles by S. Sadeghian
Total Records ( 2 ) for S. Sadeghian
  S. Sadeghian , E. Jafari and A. Hatami
  The genus Bromus L. belongs to tribe Bromeae (Poaceae, family). The taxon includes about 160 annual and perennial species distributed all over the world. It has important rangeland plant species in Iran, which are placed in 6 sections. Nine populations of three Bromus species: B. danthoniea (Three populations), B. sterilis (three populations) and B. tectorum (three populations) were selected based on their morphological characteristics to investigate their karyotypes. Preparations were made using fresh grown root tips. Saturated α-bromonaphtaline, formaldehyde and chromium trioxide (1:1), 1 N NaOH and hematoxiline were used for pre- treatment, fixative, hydrolyser and chromosome staining agent, respectively. The chromosomal studies were done using photomicroscope equipped with micrometer. Karyological data such as long arm, short arm and total length were recorded on all chromosomes of 5 well-prepared cells at metaphase stage containing a complete set of chromosomes. Finally, Pearson correlation coefficient was estimated for all paired combinations of the karyotypic characteristics to investigate their inter-relationships. Stebbins table was used for determining evolutionary state and karyotypic symmetry of the studied genotypes. All populations had mainly metacentric type chromosomes. Bromus danthoniea was placed in A1 and had the highest values of inter-asymmetry chromosomal index. It had the lowest %TF. Based on Stebbins table all species were placed in class 1A and primitive evolutionary state.
  S. Saadat , S. Sadeghian , R. Hamidian and M.A. Najafi
  This study is aimed to evaluate the impact of air pollution on the in-hospital mortality of ischemic heart disease patients in Tehran as a polluted metropolis. A cross sectional study conducted in Tehran heart center. We compared two separate exposure levels of air pollutants in patients expired in hospital (n = 23) versus patients discharged alive (n = 1219). The first was air pollutants daily mean concentration at the date of admission and the second was air pollutants daily mean concentration at the date of admission and the three following days. Patients' demographic, clinical and paraclinical data were gathered from the hospital databank between 23 September and 21 December 2005. Meteorological data were obtained from Tehran air quality control company. In-hospital mortality rate was 1.9% for men and 1.8% for women. The expired patients were older than survived patients. The mean concentration of carbon monoxide, dust, nitrous oxide, other nitrogen compounds and sulfur dioxide were significantly higher and mean temperature was significantly lower at admission date of expired patients. In expired patients, mean concentrations of nitrous oxide, nitrogen dioxide, other nitrogen compounds, sulfur dioxide, dust and non-methane hydrocarbons were significantly higher at admission date and three following days compared to survived patients. There was significant direct relationship between air pollution level and in-hospital mortality of ischemic heart disease patients.
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