Multidimensional stress and self-harm in Chinese preadolescents: A cross-sectional study.

Background: Limited research has been conducted on self-harm among preadolescents in China. This study investigated the influence of multidimensional stress on high levels of self-harm behavior in preadolescents.

Method: This large-scale cross-sectional study of 7-14-year-old primary school students in grades 3-6 was conducted in Southwest China between September and December 2020.

Mitochondrial Genomes of Two Asexual (Hymenoptera: Trichogrammatidae) Strains and Comparison with Their Sexual Relatives.

Despite its substantial costs, sexual reproduction dominates in animals. One popular explanation for the paradox of sex is that asexual reproduction is more likely to accumulate deleterious mutations than sexual reproduction. To test this hypothesis, we compared the mitogenomes of two asexual wasp strains, and to their sexual relatives.