Shahid Beheshti University of Medical Sciences and Health Services

About: Shahid Beheshti University of Medical Sciences and Health Services is a education organization based out in Tehran, Iran. It is known for research contribution in the topics: Population & Medicine. The organization has 19456 authors who have published 33659 publications receiving 365676 citations.

Aflatoxin M1 in human breast milk: A global systematic review, meta-analysis, and risk assessment study (Monte Carlo simulation)

Abstract: Background In this current study, a systematic review and meta-analysis in a global scale regarding the prevalence and concentration of aflatoxin M1 (AFM1) in the human breast milk were conducted based on the socioeconomic indexes and amounts of precipitation. Scope and approach All available studies published in PubMed, Scopus, Web of sciences and Embase databases were screened between 1 January 1983 and 25 December 2017. Also, the probabilistic carcinogenic risk by the hazard index (HI) in the Monte Carlo simulation (MCS) was calculated. Key findings and conclusions The meta-analysis of 57 papers containing 196 studies showed that the minimum and maximum concentrations of AFM1 in human breast milk was noted in Sierra Leone (0.80 ng/L) and the United Arab Emirates (UAE) (465.76 ng/L), respectively. The lowest prevalence of AFM1 in human breast milk was reported in Brazil (2%) while the highest was observed in the Gambia ∼ Tanzania ∼ Jordan (100%). The minimum and maximum concentrations of AFM1 in human breast milk were observed in America (10.30 ng/L) and South-East Asia continents (358.99 ng/L), respectively. Also, the lowest and highest prevalence of AFM1 in human breast milk was observed in the West Pacific (7%) and Africa (52%) continents, respectively. According to findings, with increasing average rain annual and poverty (GDP ranking), the prevalence of AFM1 in human breast milk significantly (P-value

The importance of professional values from nursing students' perspective.

Abstract: Professional values of nursing students may be changed considerably by curricula. This highlights the importance of the integration of professional values into nursing students’ curricula. The present study aimed to investigate the importance of professional values from nursing students’ perspective. This cross-sectional study was conducted at the Kerman University of Medical Sciences, Iran. Data were gathered by using a two-section questionnaire consisting of demographic data and Nursing Professional Values Scale-Revised (NPVS-R). By using the stratified random sampling method, 100 nursing students were included in the study. Results showed that the mean score of the students’ professional values was at high level of importance (101.79 ± 12.42). The most important values identified by the students were “maintaining confidentiality of patients” and “safeguarding patients’ right to privacy”. The values with less importance to the students were “participating in public policy decisions affecting distribution of resources” and “participating in peer review”. The professional value score had a statistically significant relationship with the students’ grade point average (P < 0.05). In light of the low importance of some values for nursing students, additional strategies may be necessary to comprehensively institutionalize professional values in nursing students.

Mechanical Characterization and Constitutive Modeling of Human Trachea: Age and Gender Dependency

Abstract: Tracheal disorders can usually reduce the free lumen diameter or wall stiffness, and hence limit airflow. Trachea tissue engineering seems a promising treatment for such disorders. The required mechanical compatibility of the prepared scaffold with native trachea necessitates investigation of the mechanical behavior of the human trachea. This study aimed at mechanical characterization of human tracheas and comparing the results based on age and gender. After isolating 30 human tracheas, samples of tracheal cartilage, smooth muscle, and connective tissue were subjected to uniaxial tension to obtain force-displacement curves and calculate stress-stretch data. Among several models, the Yeoh and Mooney-Rivlin hyperelastic functions were best able to describe hyperelastic behavior of all three tracheal components. The mean value of the elastic modulus of human tracheal cartilage was calculated to be 16.92 ± 8.76 MPa. An overall tracheal stiffening with age was observed, with the most considerable difference in the case of cartilage. Consistently, we noticed some histological alterations in cartilage and connective tissue with aging, which may play a role in age-related tracheal stiffening. No considerable effect of gender on the mechanical behavior of tracheal components was observed. The results of this study can be applied in the design and fabrication of trachea tissue engineering scaffolds.