• Random forest model is used to identify the sources of groundwater contamination. Both geogenic and anthropogenic processes affect quality. The source As, Cr, Fe Se in predominantly geogenic. As Cr pose significant health risks through drinking pathway. Northeastern Iran. In northeastern Iran, water needed for municipal agricultural activities mainly comes from resources. However, it subject ...

Unlike DNA, in addition to the 2'-OH group, uracil nucleobase and its modifications play essential roles in structure and function diversities of non-coding RNAs. Non-canonical U•U base pair is ubiquitous in non-coding RNAs, which are highly diversified. However, it is not completely clear how uracil plays the diversifing roles. To investigate and compare the uracil in U-A and U•U base pairs, w...

background: asthma is a multifactorial disease and its severity varies with the inflammatory grade. there are conflicting reports about the roles of trace elements in asthma. this study examined the effects of zinc (zn), copper (cu), and selenium (se) concentrations in sera of patients with allergic asthma attending ghaem hospital, mashhad, iran. methods: forty-nine patients, aged 10 to 50 year...

Received: 06/25/2007 Approved: 12/18/2007 Portugu se / English: www.scielo.br/reeusp RESUMO Este é um estudo exploratório de natureza quantitativa e qualitativa, que avalia o desempenho dos serviços de saúde na execução do DOT no domicílio em um município de grande porte. Para a análise quantitativa foram construídos indicadores que avaliaram a otimização dos recursos materiais/ humanos e a efe...

Three sections of Guri Member the Mishan Formation in Bandar Abbas area are investigated for foraminifera biozonation and lithostratigraphic correlation. The base conformably overlies Gachsaran (or Razak some sections), whereas top member is overlain by marls. Thirty-four foraminifer species identified prove age Burdigalian Gery Sheikh Anguran Burdigalian–Langhan range Bāz section. Two assembla...

The synthesis, base-pairing properties and in vitro and in vivo characteristics of 5-methyl-isocytosine (isoC(Me) ) and isoguanine (isoG) nucleosides, incorporated in an HNA(h) (hexitol nucleic acid)-DNA(d) mosaic backbone, are described. The required h-isoG phosphoramidite was prepared by a selective deamination as a key step. As demonstrated by Tm measurements the hexitol sugar showed slightl...

Gold-thiol chemistry is widely used in nanotechnology but has not been exploited in optical-trapping experiments due to laser-induced ablation of gold. We circumvented this problem by using an array of gold nanoposts (r = 50-250 nm, h approximately 20 nm) that allowed for quantitative optical-trapping assays without direct irradiation of the gold. DNA was covalently attached to the gold via dit...

Purpose: To determine the prevalence of refractive errors, strabismus and amblyopia in the schoolboys of Varamin city, Iran Methods: In a cross-sectional population-based study in 2010, we used random cluster sampling to select the participants from Varamin high school students. Examinations were conducted at the school site under standard conditions. All students had non-cycloplegic refraction...

background : selenium-73 (t 1/2 =7.1h) and selenium-75 (t 1/2 =119.8d) are useful radioisotopes in many research fields. the wide ranges of applications of these radioisotopes arose great interest for their production. simultaneous production of 73 se and 75 se is more cost-effective and less time-consuming. materials and methods : 73 as (p, 3n) 73 se and 75 as (p,n) 75 se reactions were determ...