background: gender preference is prevalent in some communities and using medical techniques to choose the baby’s sex may cause the gender discrimination and gender imbalance in communities. therefore, evaluating the gender preferences and attitudes towards using sex selection technologies seems to be necessary. methods: this cross-sectional study was conducted in avicenna fertility center. part...

Background: Selection of human spermatozoa prior to assisted reproduction is currently based on motility and morphology. Recently, Zeta method has been introduced for normal sperm selection based on sperm surface charges. In addition, one of the features of apoptosis is the externalization of phosphatidylserine (PS), which are normally present on the inner leaflet of the sperm plasma membrane. ...

Since the 21st century, "literacy" has been valued by countries all over world and included in core of educational reform, cultivation students' literacy put to an unprecedented height. At present stage, although China's curriculum reform is deepening stage from three-dimensional goal literacy, teaching auxiliary books that consistently implement comprehensive development students are still ini...