Wyniki wyszukiwania

1

Oxypaeoniflorin improves myocardial ischemia/reperfusion injury by activating the Sirt1/Foxo1 signaling pathway

100%

Wang K., Hu W.

Acta Biochimica Polonica

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2020

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tom 67

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nr 2

2

Forced motion CFD simulation and load refinement evaluation of floating vertical-axis tidal current turbines

81%

Zhang W., Zhou Y., Wang K., Zhou X.

Polish Maritime Research

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2020

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tom 27

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nr 3

3

Antioxidant and tyrosinase inhibitory properties of aqueous ethanol extracts from monofloral bee pollen

81%

Zhang H., Wang X., Wang K., Li C.

Journal of Apicultural Science

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2015

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tom 59

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nr 1

4

VEGF and SEMA4D have synergistic effects on the promotion of angiogenesis in epithelial ovarian cancer

81%

Chen Y., Zhang L., Liu W., Wang K.

Cellular and Molecular Biology Letters

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2018

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tom 23

Background: Anti-angiogenesis therapy that targets VEGF is one of the important treatment strategies in advanced ovarian cancer. However, depending on the pharmaceutical agent, treatment can have undesirable side effects. SEMA4D has recently gained interest for its role in promoting angiogenesis. Here, we try to further understand the mechanism by which SEMA4D promotes angiogenesis in ovarian cancer. Methods: Correlation and western blot assaya were used to detect the relationship between VEGF and SEMA4D in clinical tissues and cells. Vasculogenic mimicry and transwell migration analyses were used to detect the roles of VEGF, SEMA4D and plexin-B1 on vasculogenic mimicry and migration. Vascular density and SEMA4D expression was determined using immunofluorescence staining in clinical tissues of EOC. Western blot was used to detect the expressions of CD31, MMP2 and VE-cadherin. We also analyzed the relationship between VEGF-SEMA4D and malignant tumor prognosis. Results: We found that knockdown of VEGF could suppress SEMA4D expression and that the expressions of VEGF and SEMA4D have a positive correlation in EOC cancer tissues. Vasculogenic mimicry and transwell migration analyses showed that SEMA4D and VEGF have a synergistic effect on the promotion of angiogenesis in A2780 and HUVEC cells. Soluble SEMA4D (sSEMA4D) could promote VM and migration in A2780 and HUVEC cells via the SEMA4D/plexin-B1 pathway, but the effect was not noted in stably transfected shR-plexin-B1 cells. In clinical tissues of EOC, the vascular density and SEMA4D/plexin-B1 expression were higher. When VEGF, SEMA4D and plexin-B1 was knocked down, the expression of CD31, MMP2 and VE-cadherin, which are the markers and initiators of angiogenesis and the epithelial–mesenchymal transition (EMT) process were reduced. VEGF and SEMA4D had a positive correlation with the malignant degree of ovarian cancer, and SEMA4D can serve as an independent prognostic factor. Conclusions: VEGF and SEMA4D have synergistic effects on the promotion of angiogenesis in epithelial ovarian cancer. Targeting VEGF and the SEMA4D signaling pathway could be important for the therapy for EOC.

5

Biodiversity Versus stability: the biological effect of plant functional traits on ecosystem functioning in grasslands dominated by Leymus chinensis

81%

Zhao N., Shao X., Wang K.

Polish Journal of Ecology

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2016

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tom 64

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nr 3

Although diversity-ecosystem theory predicts that ecosystem functioning is strongly determined by species number, species traits play an important role in regulating ecosystem-level dynamics. We analyze responses of species attributes to diversity level and resource availability, and explore their consequences for ecosystem functioning and ultimately assess the contributions of five traits (vegetative plant height, clonal growth, root depth, cespitose habit and seed mass) to ecosystem functioning defined by spatial stability of community biomass. We found that functional traits disproportionately affected spatial stability. Relationships between species functional traits and spatial stability of community biomass indicated that diversity of vegetative plant height facilitated stability of a nitrogen fertilized undisturbed natural community (NAT), and that of a phosphorus fertilized forb, legume and bunchgrass community (FLB). The clonal growth form was also identified as a stabilizing trigger for a unfertilized undisturbed natural community (NAT), whereas diversity in root depth, cespitose habit and seed mass were related to destabilization of a nitrogen fertilized rhizomatous grass community (RRR). Studies quantifying interactions among plant traits, community structure and ecological functioning will contribute much more to understanding of the effects of the ecological behavior of specific traits on the ecosystem functioning.

6

Soil organic carbon, aggregates, and fractions under different land uses in the Loess Plateau, China

81%

Qu Z., Jiang R., Wang K., Li M.

Polish Journal of Environmental Studies

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2019

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tom 28

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nr 3

The dynamics of soil organic carbon (SOC) under different land uses can be beneficial for accurately assessing carbon sequestration to deal with global climate change. The aim of this study was to quantify the SOC content in various fractions under different land uses. Soil samples were collected from the top 0.1 m and 0.1-0.3 m of cropland, grassland, and forest in Huachi County of Gansu Province, China. Significant differences in physical fractions were found in the top 0.1-m layer, with cropland having the highest proportion of micro-aggregates (<250 μm), forest having the highest proportion of small macro-aggregates (250-2000 μm), and grassland tending to form large macro-aggregates (>2000 μm). SOC values were 6.9, 11.3, and 10.3 g kg⁻¹ in the top 0.1-m layer for cropland, grassland, and forest, respectively. The difference in δ¹³C between the light and heavy fraction in small macro-aggregates was smaller than that in both large macro-aggregates and micro-aggregates. These results indicated that small macro-aggregates conserved SOC relative to micro-aggregates and large macro-aggregates. The differences in δ¹³C between the light and heavy fraction in all aggregate size fractions of grassland were much larger than in forest, indicating that there was higher microbial decomposition in grasslands. Overall, our results suggested that the accumulation of SOC in grassland was derived from the abundant carbon input, but the protection of SOC from small macro-aggregates was important to forest soil.

7

Changes in species richness and community productivity during succession on the Loess Plateau (China)

81%

Wang K., Shao R., Shangguan Z.

Polish Journal of Ecology

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2010

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tom 58

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nr 3

We investigated changes in species richness, community biomass, and productivity during secondary forest succession in Ziwuling area of the Loess Plateau of China. Species richness(number of taxa) increased as the succession proceeds, and peaked at the climax forest community, but the richness growth gradually slowed down as the succession advanced. Community biomass rapidly increased from the herbaceous stage to the shrub stage and declined slightly in the climax forest stage. The maximum community biomass occurred in the pioneer forest stage. Community productivity followed an unimodal curve in the succession, and the maximum productivity occurred in the shrub community at the middle succession stage, and the communities maintained a low and stable productivity at the later succession stages. The herb and shrub species together determined community diversity during succession, while the tree species contributed less to diversity in the communities. The herb and shrub layers had a relatively low biomass, but contributed almost half of the productivity of the forest communities. The relationships between species richness, community biomass and productivity were unimodal during succession, but only the relationship between species richness and community biomass was significant.

8

Seasonal variations in leaf δ13 C values: implications for different water-use strategies among species growing on continuous dolomite outcrops in subtropical China

81%

Nie Y., Chen H., Wang K., Ding Y.

Acta Physiologiae Plantarum

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2014

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tom 36

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nr 10

Plant species growing in shallow-soil habitat are likely to experience water deficit especially in seasonally dry or arid regions. However, only scarce studies focused on their water-use strategies. The current study aimed to reveal water-use strategies of different species growing on continuous dolomite outcrops (a typical shallow-soil habitat) in subtropical China that relied on different water sources, and to investigate the differences between narrow endemic and widespread species, based on season variations in leaf δ¹³C values. Leaf samples of six plant species (Radermachera sinica, Sapium rotundifolium, Sterculia euosma, Schefflera octophylla, Alchornea trewioides, and Vitex negundo, in different life-forms and leaf phenologies) were collected for carbon isotope measurements in the wet and dry seasons, respectively. Contrary to the expectation, the evergreen big shrub species, S. octophylla, which always relied on deep water sources, exhibited the most positive δ¹³C values (high water-use efficiency, WUE), indicating more conservative water-use strategies. While the two deciduous small shrubs, A. trewioides and V. negundo, which always relied on shallow water sources, exhibited the most negative δ¹³C values (low WUE). This result was associated with their short life spans, indicating an opportunistic water-use strategy. Leaf δ¹³C values of almost all (except for S. octophylla) the selected species were significantly (P < 0.05) higher in the dry season than in the wet season. This indicated that it was a common strategy for species in rocky karst habitat to improve their WUE in dry season. Despite the similar water sources utilized by the selected three tree species, the widespread one (R. sinica) exhibited greater improvement in leaf δ¹³C values than the narrow endemic ones (S. rotundifolium and S. euosma). This suggested that the widespread tree species had more flexible water-use strategies. It was further speculated that broad spatial distribution of widespread species may contribute to their highly plastic responses to changes in environmental conditions rather than always maintaining high WUE.

9

Chemical composition, in situ degradability and in vitro digestibility of several shrubs from sandy soils

81%

Hu D. M., Wang K., Guo S. J.

Journal of Animal and Feed Sciences. Supplement

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2007

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tom 16

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nr 2

10

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First report of Feline Calicivirus (FCV) infection in stray cats in northeast China

81%

Wang K., Pei Z., Hu G.

Polish Journal of Veterinary Sciences

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2017

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tom 20

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nr 3

To improve our understanding of Feline calicivirus (FCV) infection in cats in Northeast China, 1584 serum samples from 974 domestic cats and 610 stray cats were collected between 2012 and 2015. The samples were tested for FCV antibodies using a commercially available ELISA kit. The results revealed an overall seroprevalence of 37.56% (595/1584), a seroprevalence in domestic cats of 32.85% (320/974) and a seroprevalence in stray cats of 45.08% (275/610). Risk factor analysis indicated that species was the only risk factor for the presence of FCV (OR=1.678, 95% CI=1.362-2.066, P<0.001); age, season, region and gender were not risk factors. This is the first report of FCV infection in stray cats in China, and the results of this study can aid in FCV infection control in the felidae family.

11

Dynamics of sandy desertification and detection of sandy land-steppe boundary: vegetation and soil properties

81%

Xu D., Xu X., Xie Y., Wang K.

Polish Journal of Ecology

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2012

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tom 60

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nr 2

Desertification is one of the most serious environmental problems on a global scale. China suffers from desertification over large areas. Landscape boundaries profoundly influence the structure and function of landscapes, and influence ecological processes both locally and over large scales. Data on soil properties and vegetation collected on three 110 km parallel transects across sandy land-steppe transition zone in Yanchi county, Ningxia region, northwestern China, were used to analyze changes along the sandy land/steppe boundary by using the Moving Split Window (MSW), to determine desertification dynamics, and to explore changes of vegetation and soil properties among different desertification degree. Combining the dissimilarity profiles of soil particle size with importance value (IV) of vegetation, four boundaries were detected along transects. According to the four boundaries, we divided the whole sandy land/steppe ecotone area into five desertification categories: potential desertification (PD), light desertification (LD), medium desertification (MD), severe desertification (SD) and extreme desertification (ED). Sand fractions increased, while silt and clay fractions, soil organic C, total N and available N decreased and exhibited clear gradient changes from the potential desertification land to the extreme desertification land. All areas we studied have been desertificated at different degree based upon soil particle compositions at different depths. With the aggravation of sandy desertification, the steppe species dominating in the potential desertification land gradually gave place to arid and sand tolerant perennials and therophytes and eventually to psammophyte annuals and shrubs in the extreme desertification land.

12

Detection and genotyping study of Enterocytozoon bieneusi in sheep and goats in East-Central China

81%

Li W.-C., Wang K., Gu Y.-F.

Acta Parasitologica

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2019

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tom 64

|

nr 1

13

Effects of elevated CO2 and temperature on growth and morphology of fir (Abies faxoniana, Rehd. e t Wils.) and native herbs in a treeline ecotone: an experimental approach

71%

Hou Y., Luo Z., Jenerette G. D., Qiao Y., Wang K.

Polish Journal of Ecology

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2010

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tom 58

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nr 2

Determining how changes in atmospheric CO₂ concentrations and climate affects growth of species is helpful for understanding plant community species shift in response to future environmental changes. In the present study, fir (Abies faxoniana) and native herbs from treeline ecotone of east Qinghai-Tibetan Plateau (altitude: 3230–3300 m) were exposed to ambient CO₂ or ambient +350 μmol·mol⁻¹ CO₂ concentration in combination with ambient or ambient +2°C air temperature for two years in enclosedtop chambers. The results showed that elevated CO₂ , elevated temperature and the combination of elevated CO₂ and temperature increased biomass, height and diameter of fir compared to the control. Elevated CO₂ decreased biomass of Deyeuxia scabrescens, but increased for Fragaria orientalis and Cardamine tangutorum. Except for Fragaria orientalis, herbaceous biomass decreased by elevated temperature. The combination stimulated growth of Fragaria orientalis and Cardamine tangutorum, but suppressed for Deyeuxia scabrescens and Carex kansuensis. The results also demonstrated that elevated CO₂ and temperature increased the crown size and altered the morphology of fir, with benefits for resource capture, and did not affect growth of herbs. Larger root to shoot ratio of fir contributed the enhancement of biomass, while negatively influencing the growth of some herbs. This indicates morphological changes of trees may modify their growth responses and species around them to environmental changes. The different effects of elevated CO₂ and temperature on the growth of species in treeline ecotone suggest that climate change may alter community composition and structure.

14

Detecting Suaeda salsa L. chlorophyll fluorescence response to salinity stress by using hyperspectral reflectance

61%

Zhang H., Hu H., Zhang X., Wang K., Song T., Zeng F.

Acta Physiologiae Plantarum

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2012

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tom 34

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nr 2

Measurements of chlorophyll fluorescence and hyperspectral reflectance were used to detect salinity stress in Suaeda salsa L., beach of Dongtai, Jiangsu Province, China. Three experimental sites were used in our study, which belong to low salinity, middle salinity and high salinity. The results showed that leaf chlorophyll fluorescence changed along salinity gradient. To select the sensitive hyperspectral ranges of leaf chlorophyll fluorescence, the correlationship between leaf chlorophyll fluorescence and hyperspectral reflectance was regressed and analyzed. Statistical results indicated that the 680 and 935 nm were the most sensitive hyperspectral bands for estimating leaf chlorophyll fluorescence. Then, 11 relative hyperspectral indices were selected based on the sensitive bands and previous literature. (R680 - R935)/(R680 + R935) and R680/ R935 have higher correlationship coefficient (R) and lower root mean square error, may be used for detecting chlorophyll fluorescence, such as Fo, Fm, Fv/Fm, qP, and UPSII, while NPQ may be detected by (R780 – R710)/ (R780 - R680). These results suggest that chlorophyll fluorescence of halophyte response to salinity stress could be identified by remote sensing.

15

Potential toxicity in crucian carp following exposure to metallic nanoparticles of copper, chromium, and their mixtures: A comparative study

61%

Liu Y., Yan Z., Xia J., Wang K., Ling X., Yan B.

Polish Journal of Environmental Studies

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2017

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tom 26

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nr 5

Although study of the toxicity of metallic nanoparticles in aquatic organisms is increasing, there is still little known about their combined toxicity, especially in a comparative and integrated approach. The objective of this study is to compare the toxicity of copper nanoparticles (CuNP), chromium nanoparticles (CrNP), and their mixtures to crucian carp (Carassius auratus) through a comprehensive approach. A high median lethal concentration of CuNP (390.75 mg/L) and CrNP (551.03 mg/L) was calculated from the acute toxicity, indicative of low toxicity to crucian carp. After exposure for 10 d at sublethal concentrations, several biomarker responses, including the activities of brain acetylcholinesterase (AChE), gill sodium/ potassium-activated ATP (Na⁺/K⁺ -ATP), liver superoxide dismutase (SOD), and catalase (CAT) were significantly inhibited by all nanoparticles in most cases, implying the neurotoxicity, osmoregulatory toxicity, and oxidative damage of metallic nanoparticles. Thereafter, the integrated biomarker response version 2 (IBRv2) integrating all biomarker responses was applied to compare the toxicity, and therefore the toxicity order was tentatively proposed as: the mixtures ≈ CuNP＞CrNP, suggesting a synergistic effect in the mixtures. The findings will help to understand the ecological impacts of metallic nanoparticles in an aquatic environment in a more complete and accurate picture.

16

Crosstalk between ABA, auxin, MAPK signaling, and the cell cycle in cadmium-stressed rice seedlings

61%

Zhao F. Y., Wang K., Zhang S. Y., Ren J., Liu T., Wang X.

Acta Physiologiae Plantarum

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2014

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tom 36

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nr 07

We studied the link between abscisic acid (ABA), auxin, MAPK (mitogen-activated protein kinase) signaling, and the cell cycle in cadmium (Cd)-stressed rice (Oryza sativa L. cv. Zhonghua No. 11) roots. ABA can partially compensate for root growth inhibition and counteract over-accumulation of auxin caused by Cd. GUS staining of rice plants harboring DR5-GUS showed that ABA affects auxin distribution in Cd-stressed roots. Detection using DRB (5,6-dichlorobenzimidazole 1-β-ᴅ-ribofuranoside, an RNA synthesis inhibitor), MG132 (a protein degradation inhibitor), BFA (brefeldin A, a protein transport inhibitor), and TIBA (2,3,5-triiodobenzoic acid, a polar auxin transport inhibitor) revealed that ABA regulates the distribution of auxin via transcription, protein degradation, and transport pathways under Cd stress. Several genes related to ABA and MAPK, key components of the auxin signaling pathway, and the cell cycle were differentially regulated by Cd plus ABA vs. Cd plus tungstate (TS) (a ABA biosynthesis inhibitor) at 7 days or 11 days of treatment in roots, indicating that ABA levels affect the transcription of these genes, and that these genes are differentially regulated by ABA in rice seedlings at different developmental stages. Furthermore, the expression of some of these genes differed between Cd + ABA/TS-treated plants and plants treated with TS or ABA alone, suggesting that ABA signaling serves specific functions in the regulation of gene expression under Cd stress. Overall, these results suggest that ABA coordinates auxin and MAPK signaling and the cell cycle in response to Cd stress. The ABA signal transduction pathways in Cd-stressed rice plants are discussed.

17

Effect of core temperature on the oxidation of lipids and proteins during steam cooking of large-mouth bass (Micropterus salmoides)

61%

Wang K., Bao Y., Yang H., Wang Y., Chen D., Regenstein J. M., Zhou P.

Polish Journal of Food and Nutrition Sciences

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2020

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tom 70

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nr 3

18

Mouse duodenum as a model of inflammation induced by enterotoxigenic Escherichia coli K88

61%

Wang K., Qi Y., Yi S., Pei Z., Pan N., Hu G.

Journal of Veterinary Research

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2016

|

tom 60

|

nr 1

19

The expression profile of Fc receptor-like Y in B lymphocytes with hepatitis B virus induced diseases

61%

Wang K., Yang R.-L., Pei H., Wu H.-Y., Zhang J., Huang B.

Folia Histochemica et Cytobiologica

|

2011

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tom 49

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nr 3

20

Effects of the wheat UDP-glucosyltransferase gene TaUGT-B2 on Agrobacterium-mediated plant transformation

61%

Zhou X., Wang K., Du L., Liu Y., Lin Z., Ye X.

Acta Physiologiae Plantarum

|

2017

|

tom 39

|

nr 01

Ograniczanie wyników

Oxypaeoniflorin improves myocardial ischemia/reperfusion injury by activating the Sirt1/Foxo1 signaling pathway

Forced motion CFD simulation and load refinement evaluation of floating vertical-axis tidal current turbines

Antioxidant and tyrosinase inhibitory properties of aqueous ethanol extracts from monofloral bee pollen

VEGF and SEMA4D have synergistic effects on the promotion of angiogenesis in epithelial ovarian cancer

Biodiversity Versus stability: the biological effect of plant functional traits on ecosystem functioning in grasslands dominated by Leymus chinensis

Soil organic carbon, aggregates, and fractions under different land uses in the Loess Plateau, China

Changes in species richness and community productivity during succession on the Loess Plateau (China)

Seasonal variations in leaf δ13 C values: implications for different water-use strategies among species growing on continuous dolomite outcrops in subtropical China

Chemical composition, in situ degradability and in vitro digestibility of several shrubs from sandy soils

First report of Feline Calicivirus (FCV) infection in stray cats in northeast China

Dynamics of sandy desertification and detection of sandy land-steppe boundary: vegetation and soil properties

Detection and genotyping study of Enterocytozoon bieneusi in sheep and goats in East-Central China

Effects of elevated CO2 and temperature on growth and morphology of fir (Abies faxoniana, Rehd. e t Wils.) and native herbs in a treeline ecotone: an experimental approach

Detecting Suaeda salsa L. chlorophyll fluorescence response to salinity stress by using hyperspectral reflectance

Potential toxicity in crucian carp following exposure to metallic nanoparticles of copper, chromium, and their mixtures: A comparative study

Crosstalk between ABA, auxin, MAPK signaling, and the cell cycle in cadmium-stressed rice seedlings

Effect of core temperature on the oxidation of lipids and proteins during steam cooking of large-mouth bass (Micropterus salmoides)

Mouse duodenum as a model of inflammation induced by enterotoxigenic Escherichia coli K88

The expression profile of Fc receptor-like Y in B lymphocytes with hepatitis B virus induced diseases