The relationship between physical activity in early pregnancy and hypertensive disorders of pregnancy: a cohort study in Chinese women.

Background: We aimed to examine prospective associations between different intensities and different types of physical activity (PA) in early pregnancy and hypertensive disorders of pregnancy (HDP) among Chinese women.

Methods: A total of 6,820 pregnant women from the Tongji-Shuangliu Birth Cohort were included in this study. The pregnancy physical activity questionnaire (PPAQ) was used to assess PA, including household/caregiving, occupational, sports/exercise, and transportation activities in the first trimester of pregnancy.

Global research trends in cardiac arrest research: a visual analysis of the literature based on CiteSpace.

Background: The high morbidity, high mortality and low survival rate of cardiac arrest (CA) cause a heavy global burden. We aimed to analyze the changes in scientific output related to CA over the past two decades.

Methods: We analyzed the scientific output related to CA from 2000 to 2020 via the Web of Science.

Observations of linear aggregation behavior in rotifers (Brachionus calyciflorus).

Linear aggregation is present in some animals, such as the coordinated movement of ants and the migration of caterpillars and spinylobsters, but none has been reported on rotifers. The rotifers were collected and clone cultured in the laboratory at 25 ± 1°C, under natural light (light intensity ~130 lx, L:D = 14:10). The culture medium(pH = 7.