this research was designed to study sexual differences in place conditioning induced by morphine in offspring born of female wistar rats mated with drug-naïve males. mothers were exposed to morphine during the 14th-16th days of gestational. control dams were simply saline-injected. female and male virgin offspring born of morphine-treated or saline-treated mothers were separately housed until b...

Reptiles posses two main mechanisms of sex determination. In some species the sex of the individual is determined at conception by sex factors contained in sex chromosomes (termed genotypic sex determination or GSD). However, in other species sex is determined after conception by the environmental temperature during incubation and cannot be predicted by zygotic genotype (Bull, 1983; Valenzuela ...

Objective: Methamphetamine consumers use can have more efficient practices, be hyperactive, and take sexual risk-taking behaviors. These behaviors are particularly remarkable in homosexuals. Methods: The present study was conducted based on casual-comparative method in the field of descriptive studies. Since 1 March to 25 June 2015, a total of 62 MSM subjects were selected ...