background: cox proportional hazard (cph) model is the most widely used model for survival analysis. when there are unobserved/unmeasured individuals factor, then the results of the cox proportional hazard model may not be reliable. the purpose of this study was to compare the results of cph and frailty models in breast cancer (bc) patients. methods: a historical cohort study was carried out us...

The antioxidant properties of coumarin derivatives using the 2,2ˈ -diphenyl-1- picrylhydrazyl (DPPH) radical scavenging assay were investigated by the application of Quantitative Structure Activity Relationship (QSAR) studies. The molecular structures were optimized and submitted for the generation of quantum chemical and molecular descriptors. Genetic Function Algorithm (GFA) was employed in m...

To calculate and evaluate wave scattering and penetration of electromagnetic waves in different biological tissues it is necessary to use a realistic model of the human body, with all tissues resolved and separately assigned with appropriate electric/magnetic properties. We report the development of a realistic 3D whole-body human model that has been adapted for simulation in CST software, cont...

background : breast cancer is a complicated disease and has various clinical manifestations and prognosis. the aim of this study is to make a breast cancer model suitable for basic, preclinical and clinical studies. materials and methods: five virgin bulb/c mice aged 6 weeks and spontaneous murine mammary adenocarcinoma cells (mmac) were used. after anesthesia induction, 1-3 million of mmacs we...

abstract background: leachate produced by waste disposal sites can be contaminating groundwater. the contamination vulnerability and groundwater protection assessment has proved to be an effective tool for the delineation of protection zones in area affected by groundwater contamination. the main objective of the study is to evaluate aquifer pollution vulnerability in the new waste disposal sit...

background: healthcare authorities, in all around the world, are faced with resources limitations and limitless needs of citizens. therefore, optimal resources allocation, particularly in the health sector and emergency system, seems to be of great importance. the present study aimed to determine the optimality rate of patients' distribution to hospitals by emergency stations based on the trans...

today's world has been built on the basis of competition and uncertainty, thus the role of facilitators, such as technology and information technology is undeniable. in this research developed technology acceptance model to identify and prioritizing the factors affecting was used on formation of decision and behavior of customers in adoption of internet banking of post bank. the statistica...

the main purpose of this research is design a competency model for curriculum planners. analysis - inductively method with of the curriculum planner’s expert’s viewpoint was used. to determine the competency model for curriculum planner’s 5-stage methodology byham & moyer was used. in the first phase was reviewed subject literature and academic resources. curriculum experts were interviewed in ...

background: hospitals are the central entity of each health care system and health promoting hospitals (hph) was launched by who in 1988. however, there has not been any accurate and detailed model for establishing a hph in iran up to now. therefore, this study aimed to determine factors affecting the establishment of a health promoting hospital in iran using factor analysis method. methods: th...

trichomoniasis, a worldwide prevalent infection, is a perfect example of interplay between the infecting parasite and the host, on which the presentation of disease depends. to study the pathogenesis, animal model is required for establishment of infection. in this study, by using strains of trichomonas vaginalis isolated from vaginal swabs and/or urine samples and maintained in axenic form fro...