Environmental filtering and dispersal limitation jointly shaped the taxonomic and phylogenetic beta diversity of natural forests in southern China.

Aim: The mechanisms underlying the maintenance of biodiversity remain to be elucidated. Taxonomic diversity alone remains an unresolved issue, especially in terms of the mechanisms of species co-existence. We hypothesized that phylogenetic information could help to elucidate the mechanism of community assembly and the services and functions of ecosystems.

A prospective, randomised double-blind study on the anaesthetic effect of dexmedetomidine hydrochloride in brainstem tumour surgery.

Context: Brainstem tumour surgery is difficult, and accidents can easily occur.

Objective: To explore the effect of dexmedetomidine hydrochloride on brainstem tumour surgery.

Design, Setting And Participants: A total of 60 patients with brainstem tumours successfully operated on by our hospital from March 2016 to March 2018 were selected as subjects.

[Foliar stable carbon isotope composition and water use efficiency of plant in the Karst seasonal rain forest.].

To enrich niche partition and species coexistence theory in karst seasonal rain forest, and provide reference for species selection and configuration for rocky desertification control, we exami-ned foliar stable carbon isotope composition (δC) and water use efficiency (WUE) of the representative species in different habitats and the same tree species in different habitats. The results showed that foliar δC value in karst seasonal rain forest ranged from -34.13‰ to -29.

[The clinical significance of S100β protein in cerebrospinal fluid and serum from the patients with cerebral hemorrhage].

Aim: To observe the change and the clinical significance of S100β protein level in cerebrospinal fluid and serum from the patients with cerebral hemorrhage (CH).

Methods: ELISA was used to detect the expression of S100β protein in CSF and serum from CH patients control with Inguinal Hernia or great saphenous varix patients. Meanwhile, rabbit CH model at 6 h, 12 h, 24 h, 48 h, 72 h and 96 h .

[Spatial patterns of and specific correlations between dominant tree species in a karst evergreen and deciduous broadleaved mixed forest in Mulun Karst National Nature Reserve].

In order to understand the biological characteristics and specific correlations of dominant tree species in a karst characteristic evergreen and deciduous broad-leaved mixed forest in Mulun National Nature Reserve of Guangxi, a point pattern analysis was made on the spatial distribution patterns and inter- and intraspecific correlations of four dominant species in a one-hectare plot. Among the four species, Boniodendron minius dominated in tree sublayer I, while Ligustrum japonicum, Sinosideroxylon wightianum, and Rapanea kwangsiensis dominated in tree sublayers II and III. All the four species had a clumped distribution at scale <10 m, a transition from clumped to random distribution at scale 10-25 m, and a random or regular distribution at scale >25 m.