[Moderate grazing increases the abundance of soil methane-oxidizing bacteria and CH uptake rate in a typical steppe of Inner Mongolia, China].

Microbial oxidation is the only biological sink of atmospheric methane (CH). It is essential to understand the variation of CH fluxes among different grassland use types for developing low-emission management system. Here, we measured the CH flux and the soil methane-oxidizing bacteria abundance in a typical steppe under grazing, mowing and fencing management in central Inner Mongolia, with the aims to determine the effects of these grassland use types on CH flux, and to test the hypothesis that pmoA functional gene abundance regulates CH fluxes.

[Effects of grazing and mowing on macrofauna communities in a typical steppe of Inner Mongolia, China].

The dynamic features of the ecosystem components under different human activities are fundamental for understanding the ecosystem change mechanisms and developing sustainable mana-gement system. For the vast temperate steppe ecosystems in northern China, there existed many studies on the effects of animal grazing and mowing on plant and soil microbial communities, but not the soil fauna communities. We investigated the soil macrofauna communities of a typical Inner Mongolia steppe grassland under 6 utilization treatments (1 full season grazing, 3 different seasonal grazing, 1 autumn mowing and 1 control of no grazing or mowing).

Effect of transarterial pulsed perfusion with heated saline on tumor vascular permeability in a rabbit VX2 liver tumor model.

Purpose: To evaluate the effect of transarterial pulsed perfusion with 60 °C saline on vascular permeability of tumor tissue, as well as its hepatic and renal toxicity, in a rabbit VX2 liver model.

Materials And Methods: VX2 carcinomas were grown in rabbit livers, forty male New Zealand white tumor-bearing rabbits were randomly divided into four groups, followed by transarterial perfusion with 37 °C saline 60 ml (n=10) (control 1 group), transarterial pulsed perfusion with 37 °C saline 60 ml (n=10) (control 2 group), transarterial continuous perfusion with 60 °C saline 60 ml (n=10) (TCP group), transarterial pulsed perfusion with 60 °C saline 60 ml (n=10) (TPP group), the duration of time for tumor tissues in the range 43-45 °C of the treated groups was measured with needle thermometer during perfusion. Vascular permeability was assessed using the extravasation of Evans blue (EB) dye in the tumor or normal liver tissues of the four groups separately, the tumor or normal liver tissues of the four groups were estimated by histopathologic examination, and hepatic and renal toxicity was evaluated by means of blood biochemical analysis.