Aims: In nanoecotoxicology science, fish erythrocyte micronucleus assay for the monitoring genotoxic potential of nanoparticles is a powerful biomarker. This study was conducted with the aim of investigating genotoxicity of magnetic iron oxide (Fe₃O₄) nanoparticles in red blood cells of common carp (Cyprinus carpio) using micronucleus assay under acute and chronic treatment. Materials and Methods: In the current experimental study, the genotoxit toxicology of Fe₃O₄ nanoparticles was performed during an acute (96 hours; 5 concentrations including 0, 10, 100, 500, and 1000 mg/l) and chronic (14 days; 3 concentrations including 0, 100, and 500 mg/l) of Fe₃O₄ nanoparticles in three replications. The data were analyzed by IBM SPSS 19, using two-way ANOVA, and Duncan's new multiple range test.
Findings: Acute exposure to Fe₃O₄ nanoparticles had no acute toxicity effect juvenile carp (C. carpio). By increasing the concentration of nanoparticles in a 96-hour interval, the frequency of micronucleus (‰) and other abnormal forms around the red blood cell nucleus of juvenile carps showed a significant increase compared to the control group (p<0.05). In the chronic treatment at concentrations of 100 and 500 mg/l of Fe₃O₄ nanoparticles, the rate of increase in the frequency of micronucleus was similar to the acute functional test of concentration.
Conclusion: Although Fe₃O₄ nanoparticles do not have acute toxicity effects in common carp and are non-toxic, they tend to induce genotoxic effects by increasing the frequency of micronucleus and other abnormalities of the red blood cell core during a concentration-dependent process. So, it seems that the release of FeO₄NPs into the environment, it is probable adverse effects on aquatic ecosystems.

   Change in the family in Iran has strengthened the discourse of disintegration. In this article examines the phenomenological study of the conceptual space of the family and its status through of actors. The research has been done with a qualitative approach and relying on the live people from different family models. The study population is a purposeful sample of 29 residents of Tehran at 2017, which includes the normative family and its alternatives. Necessary data were collected by interview technique and analyzed and interpreted by content analysis method. Research has shown that in the mental space of actors, the family model is not obsolete but is facing changes and has changed from function emotional and from rigid structure to fluid and process and jointly with the main the main themes of sexual satisfaction, support, commitment, love and Sustainability is built. Strategies show that the family and its alternatives are moving towards the nuclear family model. Also, an important feature of the family and its distinguishing feature from the Western model is maintaining family relations, navigating the kinship system, and maintaining its emotional and economic support. Thus, the dependent nuclear family is the dominant mode in the conceptual space of the family.