background: this study aimed at determining the drug abuse pattern and the frequency of high-risk behaviors among the clients of methadone maintenance treatment centers and drop-in centers in shahroud county of semnan province. methods: in this cross-sectional study, the data collection tool was a questionnaire including 10 general and 32 specific items about drug abuse pattern and high-risk be...

the present study was conducted to quantify the density and abundance of weeds in wheat fields of south khorasan province during 2010 and 56 species of weed form 16 plant families were identified in 240 farms of eight towns around this province. the most families in number of species were pertaining to poaceae, asteraceae and chenopodiaceae with 15 (26.79%), nine (16.7%), six (10.71%) and six (...

the incidence of pre-lingual hearing loss (hl) is about 1 in 1000 neonates. more than 60% of cases are inherited. non-syndromic hl (nshl) is extremely heterogeneous: more than 130 loci have been identified so far. the most common form of nshl is the autosomal recessive form (arnshl). in this study, a cohort of 36 big arnshl pedigrees with 4 or more patients from 7 provinces of iran was investig...

the mordell-weil theorem states that the group of rational points‎ ‎on an elliptic curve over the rational numbers is a finitely‎ ‎generated abelian group‎. ‎in our previous paper, h‎. ‎daghigh‎, ‎and s‎. ‎didari‎, on the elliptic curves of the form $ y^2=x^3-3px$‎, ‎‎bull‎. ‎iranian math‎. ‎soc‎.‎‎ 40 (2014)‎, no‎. ‎5‎, ‎1119--1133‎.‎, ‎using selmer groups‎, ‎we have shown that for a prime $p$...