introduction the chemical characteristic of groundwater as a major source of water supply for human life is an important factor in determining the usage of it for agriculture, industry and drinking. useful techniques and different methods of studying the chemical composition of groundwater such as correlation coefficient, descriptive statistics, factor analysis and cluster analysis provide an u...

Nerve growth factor (NGF) is a neurotrophic factor that is functional in the survival, maintenance and differentiation of nervous system cells. This protein has three subunits, of which the beta subunit has the main activity. Its structure consists of a cysteine knot motif made up of beta strands linked by disulfide bonds. It can be used as a therapeutic agent in the treatment of many diseases....

evaluation of communication abilities in the elderly is crucial for activities which will be performed to improve their quality of life. a valid and reliable questionnaire is needed for assessing communication abilities. we aimed to translate and validate the speech, spatial, and qualities of hearing scale (ssq) in iran. the forward-backward procedure was applied to translate the questionnaire ...

the present research is concerned with the determination of ductility, over-strength and response modification factors of coupled steel shear wall frames. three structural models with various numbers of stories, bay width and coupling beam height were analyzed using static pushover and incremental nonlinear dynamic analyses. the ductility, over-strength and response modification factors for the...

background: infertility is common among couples of child-bearing age and ap-proximately half of known causes of primary infertility are attributable to male factor. it is still unclear whether the injurious effects of cigarette smoking on sperm characteristics and infertility are due to nicotine. therefore, the present study investigated the effects of orally administered of nicotine on sperm c...

background: asphyxia is a medical condition in which placental or pulmonary gas exchange is impaired or they cease all together, typically producing a combination of progressive hypoxemia and hypercapnea. objective: in addition to regional differences in its etiology; it is important to know its risk factors. materials and methods: this is a case-control study, all neonates born from may 2002 t...