Fencing enclosures play an important role in improving ecological quality. There is a direct impact of implementing fencing enclosures on the change in soil quality. The soil quality index was used to examine the effects of fencing enclosures for different years (7 and 11 years) on soil quality in Biru County of Qinghai–Tibet Plateau, China. The fencing enclosure significantly increased soil water content, non-capillary porosity, soil organic matter, total nitrogen, total phosphorus, and alkali-hydrolyzable nitrogen, and significantly decreased the soil bulk density. The soil quality gradually improved as the fencing enclosure time length increased, probably due to the increase of vegetation coverage and biomass under the fencing enclosure. The minimum data set was composed of soil organic matter, capillary porosity, total potassium, and non-capillary porosity. The minimum data set was significantly correlated with the total data set and could replace the total data set for soil quality evaluation in the fencing enclosure project area. In summary, our study reflects that fencing enclosures significantly improve soil quality, and the implementation of the fencing enclosure project will effectively curb land degradation in Biru County of the Qinghai–Tibet Plateau, China.
To investigate the effect of pristimerin on gefitinib resistance in lung cancer cells and its regulation on microRNA-936. Lung cancer cell HCC827 was cultured in vitro, lung cancer gefitinib resistant cell HCC827/gefitinib resistant was established and HCC827/gefitinib resistant cells were randomly assigned to control group, pristimerin-L group, pristimerin-M group, pristimerin-H group, gefitinib group, gefitinib+pristimerin group, gefitinib+microRNA-negative control group, gefitinib+microRNA-936 group, gefitinib+pristimerin+anti-microRNA negative control group and gefitinib+pristimerin+anti-microRNA-936 group. 3-(4,5-dimethylthiazolyl-2)-2,5-diphenyltetrazolium bromide was used to detect the inhibition rate of cell proliferation, as well as the median half-maximal inhibitory concentration; the expression amount of microRNA-936 was detected by quantitative reverse transcription-polymerase chain reaction; cell migration and invasion were detected by transwell chamber assay. Compared with HCC827 cells, the proliferation inhibition rate of HCC827/gefitinib resistant cells was significantly lower and the half-maximal inhibitory concentration value was significantly higher (p<0.05); compared with the control group, the inhibition rate of cell proliferation was increased, the half-maximal inhibitory concentration value was decreased and the expression of microRNA-936 was increased (p<0.05) in pristimerin-L group, pristimerin-M group and pristimerin-H group; compared with the gefitinib group, the inhibition rate of cell proliferation was higher and the number of migration and invasion cells decreased in the gefitinib+pristimerin group (p<0.05); compared with the gefitinib+microRNA negative control group, the gefitinib+microRNA-936 group showed higher cell proliferation inhibition rate and lower cell number in migration and invasion (p<0.05); compared with the gefitinib+pristimerin+anti-microRNA negative control group, the cell proliferation inhibition rate decreased and the migration and invasion cell numbers increased in the gefitinib+pristimerin+anti-microRNA-936 group (p<0.05). Pristimerin may enhance cell gefitinib sensitivity by inhibiting proliferation, migration and invasion of gefitinib resistant cells in lung cancer by up regulating microRNA-936 expression.
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