Gastrointestinal symptoms and fecal nucleic acid testing of children with 2019 coronavirus disease: a systematic review and meta-analysis.

In order to understand the clinical manifestations and incidence of gastrointestinal symptoms of coronavirus disease (COVID-19) in children and discuss the importance of fecal nucleic acid testing.We retrospectively analyzed studies on gastrointestinal symptoms and fecal nucleic acid detection in pediatric COVID-19 patients from January 1, 2020 to August 10, 2020, including prospective clinical studies and case reports. The results of fecal nucleic acid detection were analyzed systematically.

Function and evolution of sterile sex organs in cryptically dioecious Petasites tricholobus (Asteraceae).

Background And Aims: Why are sterile anthers and carpels retained in some flowering plants, given their likely costs? To address this question, a cryptically dioecious species, Petasites tricholobus, in which male and female plants each have two floret types that appear pistillate and hermaphroditic, was studied. The aim was to understand the function of sterile hermaphroditic florets in females. In addition, the first examination of functions of sterile female structures in male plants was conducted in the hermaphroditic florets on males of this species.

[Determination of trace elements in hair of mice infected with Trichinella spiralis].

Mice were divided into 3 groups: heavy infection group with 80 mice each was fed with 400 muscle larvae of Trichinella spiralis, light infection group with 60 mice each was fed by 200 larvae, and uninfected control (60 mice) . The content of Cu, Zn and Fe in the dorsal hair samples was measured in the week of 1, 3, 5, 7, 9, 11, 13 and 15 after infection. Results indicated that the content of Zn, Cu and Fe in the two experimental groups reduced considerably in comparison to the control (P < 0.