[Spatial-temporal variations of vegetation coverage and its driving force in Inner Mongolia grassland, China].

Inner Mongolia grassland is rich in natural vegetation and mineral resources. Based on Landsat5/7/8 NDVI data, we used pixel binary model to invert vegetation coverage of Inner Mongolia grassland area, investigated the stability, spatial distribution, and future evolution trend of vegetation coverage by using Sen+MK and Hurst index, and analyzed the driving factors of the spatial differentiation of vegetation coverage by the optimal parameters-based geographical detector. The results showed that vegetation coverage of Inner Mongolia grassland showed an increasing trend from 2006 to 2020, and the overall spatial pattern was high in the east and low in the west, mainly with great fluctuation.

[Understory plant diversity and soil physicochemical properties of artificial water conservation forests in the upper reaches of Miyun Reservoir, China].

We examined the characteristics of understory plant diversity and physicochemical properties and analyzed the correlation between understory plant diversity and soil factors across four artificial water conservation forests ( plantation, plantation, plantation, and plantation) in Fengning County, upstream of Miyun reservoir. The results showed that the composition and structure of understory community of the four forests were significantly different. The understory community in the × plantation was the richest in species composition, with , , and as the main dominant species.

[Characteristics and Source Apportionment of Dustfall Pollution in the Coal Mine Area and Surrounding Areas of Wuhai City in Spring].

To study the concentration levels, pollution characteristics of each functional area, and sources of pollutants of the dust heavy metals Al, As, Ba, Be, Cd, Co, Cr, Cu, Fe, Li, Mg, Mn, Ni, Pb, Sb, Ti, V, and Zn in spring in Wuhai, 43 groups of dust samples were collected from different locations within the city from March to June 2018. The heavy metal mass concentration was then measured using an inductively coupled plasma optical emission spectrometer (ICP-OES). The results showed that:①The average contents of As, Cd, Cu, Pb, Cr, Ni, Sb, and Zn were 408.

[Spatial variability of surface soil nutrients in the landslide area of Beichuan County, South- west China, after 5 · 12 Wenchuan Earthquake].

Based on grid sampling and laboratory analysis, spatial variability of surface soil nutrients was analyzed with GS⁺ and other statistics methods on the landslide area of Fenghuang Mountain, Leigu Town, Beichuan County. The results showed that except for high variability of available phosphorus, other soil nutrients exhibited moderate variability. The ratios of nugget to sill of the soil available phosphorus and soil organic carbon were 27.

[Effect of heme oxugenase-1 on delayed xenograft rejection: experiment of guinea pig-to-rat liver xenotransplantation].

Objective: To investigate the effects and mechanism of heme oxygenase-1 (HO-1) in liver xenotransplantation and mechanism thereof.

Methods: Thirty male guinea-pigs used as donors were injected intravenously with cobra venom factor (CVF) and then randomly divided into 3 groups 24 hours after: Group A injected intraperineally with NaCl, Group B injected intraperineally with cobalt-protoporphyrin (CoPP), heme oxygenase-1 inducer, and Group C injected intraperineally with CoPP and zinc protoporphyrin (ZnPP), HO-1 inhibitor zinc before their livers were harvested. Thirty male SD rats used as recipients underwent the above-mentioned treatment 24 hours before receiving the xenografts.

[Mechanisms of purified cobra venom factor in preventing hyperacute rejection following discordant liver xenotransplantation in rats].

Objective: To investigate the mechanisms of purified cobra venom factor (CVF) in preventing hyperacute rejection (HAR) and prolonging recipient survival following discordant liver xenotransplantation in rats.

Methods: All animals were divided into two groups, group I (n = 20), unmodified recipients as control; group II (n = 20), xenograft recipients were treated with 50 microg/kg CVF i.v.

[Effects of human plasminogen Kringle 5 gene therapy on pancreatic cancer].

Objective: To investigate the effects of transfection of human plasminogen Kringle 5 gene on pancreatic cancer.

Methods: Human pancreatic cancer cells of the line PC-3 were cultured. Recombinant plasmid RINGLE 5 containing human plasminogen Kringle 5 cDNA was transfected into the PC-3 cells mediated by lipodectAMINE.