introduction: sex differences are observed in the development of tolerance to antinociceptive effect of opioid drugs such as morphine, but the underlying mechanisms remain unclear. critical role of glutamate in the development and maintenance of opioid tolerance has been reported by many investigators. there are also evidences about interaction between gonadal hormones and neuromodulatory syste...

Empirical analyses of sex differences in the career consequences of family migration have focused on adjudicating between the human capital and the gender-role explanations but have ignored the potential infl uence of gender inequality in the structure of the labor market. In this paper we estimate conditional difference-in-difference models with individual-, familyand occupation-level data to ...

Using longitudinal data and structural modeling, we investigated bidirectional associations among preadolescents' peer relationships, peer-relevant cognition, and depressive symptoms. Depression was expected to be an outcome and precursor of peer-relevant cognition, and cognition was expected to be an outcome and precursor of being more or less liked by classmates (peer likeability). We also ex...

BACKGROUND Nearly one-half of Guatemalan children experience growth faltering, more so in indigenous than in nonindigenous children. OBJECTIVES On the basis of ethnographic interviews in Totonicapán, Guatemala, which revealed differences in maternal perceptions about food needs in infant girls and boys, we predicted a cumulative sex difference in favor of girls that occurred at ∼6 mo of age a...

abstract introduction: psychological theories and literature have confirmed self-destructiveness patterns in human beings. chronic self-destructiveness has been defined as a tendency to behaviors that increase negative consequences and decrease potential success in the future. the aim of this study was to investigate prediction of chronic self-destructiveness based on the depression symptoms, i...