Wyniki wyszukiwania

1

Climate change, the evaporation paradox, and their effects on streamflow in Lijiang watershed

100%

Jiao L., Wang D.

Polish Journal of Environmental Studies

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2018

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tom 27

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nr 6

Global warming has become an indisputable fact over the past century, while much research has shown that the rate of potential evapotranspiration had been consistently decreasing throughout the world over the past 50 years. This phenomenon is called the “evaporation paradox.” In this study we tested the trends of potential evapotranspiration and air temperature, and analyzed the effects of climate change on streamflow. The conclusions include: 1) The potential evapotranspiration of the Lijiang watershed is significantly decreased at the 0.1 confidence level and temperature is significantly increased at the 0.01 confidence level. 2) Evaporation paradox exists in the Lijiang watershed, caused mainly by sunshine duration decrease. 3) The annual streamflow and precipitation of Lijiang watershed both showed a decreased trend: compared between the first decade of 1976-1985 and the last decade of 2006-2015, streamflow decreased 8.48% and precipitation decreased 7.65%. 4) The sensitivities of streamflow to precipitation and potential evapotranspiration were 1.4152 and -0.4152, respectively, and the effects of precipitation and potential evapotranspiration on streamflow were a 10.83% decrease and 1.67% increase, respectively.

2

Seasonal variations in thermogenesis and energy requirements of plateau pikas Ochotona curzoniae and root voles Microtus oeconomus

100%

Wang D., Wang Z.

Acta Theriologica

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1996

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tom 41

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nr 3

The seasonal patterns of nonshivering thermogeneis (NST), resting metabolic rate (RMR) at 15"C and 25"C in plateau pikas Ochotona curzoniae {Hodgson, 1858) and root voles Microtus oeconomus (Pallas, 1776), from the Qinghai-Tibetan plateau, were determined and thermal conductance was calculated. NST tended to increase during cold season for both species. No significant seasonal variations in NST were found in pikas {mean maximum in winter: 3.46 ± 0.19 ml Oa/g-h; minimum in spring: 3.07 + 0,16 ml Ou/g-h). Voles increased NST significantly as the ambient temperature decreased, from the lowest, mean 8.00 ± 0.42 ml Oa/g-h, in summer to the peak in winter, mean 11.29 i 0.44 ml Os/g* h. RJV1R and thermal conductance were lower in winter than those in summer for both species (mean in summer at 25'C: 4.96 + 0.35 ml 02/g-h and 0.509 ± 0.027 ml Oa/g-h-"C for voles and 2.11 ± 0,09 ml Os/g-h and 0.179 ± 0.003 ml Oa/g-h-'C for pikas, respectivly; mean in winter at 25°C: 4.22 ± 0.26 mlOa/g*h and 0.379 ± 0.012 mlCVg-h-'C for voles and 1.55 ± 0.06 ml Oa/g-h and 0.123 ± 0.003 ml Oa/g-h'"C for pikas, respectively). Voles lost body weights in winter whereas pikas kept their body weights. This suggests that alpine small mammals, which have high levels of metabolism and thermal conductance, mainly depend on increasing thermogenic capacities and insulation, decreasing energy expenditure per individual, augmented by behavoral adjustments to cope with cold temperatres of winter.

3

Effects of nutrient availability and competition between two grass species Leymus chinensis [Trin.] Tzvel. and Phragmites communis Trin. on the plant performance

81%

Ba L., Xiao N., Xu W., Wang D.

Polish Journal of Ecology

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2008

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tom 56

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nr 3

453-462

Leymus chinensis (Trin.) Tzvel., a perennial grass, is a dominant species from arid to semi-arid steppes in northern China and eastern Mongolia. Phragmites communis Trin. is also a perennial grass, and is distributed widely in the world. In the natural grasslands of northeastern China, both species always co-exist as co-dominating species due to their common characteristics such as propagation both by seeds and vegetative reproduction. Replacement series experiments were used to test the effects of nutrient availability and competitive interaction on the growth performance of two clonal plant species. The experimental treatments included five nutrient levels (3.6, 7.2, 10.8, 14.4 and 18.0 kg organic matter per pot, 20 cm diameter and 15 cm deep) and five species proportions (20:0, 16:4, 10:10, 4:16 and 0:20 for L. chinensis and P. communis, respectively) with twenty tillers in total per pot. Each treatment had 10 replications. Growth characteristics including tiller height, tiller number, plant biomass, rhizome length and bud number of plants in monoculture and mixture culture were recorded and compared to examine the effects of nutrient and competitive interaction on the plant performance. The growth of L. chinensis and P. communis in mixture was influenced by the nutrient availability and competition, which depended on the combination between nutrient level and species proportion. The results implied that the intensity of competition should be lower in nutrient-poor habitats when the co-existing species demanded on the same limiting resource. P. communis benefited from coexisting with L. chinensis, especially under nutrient-rich conditions. The aboveground relative yield (RYabove) expressed in units of tiller height, dry biomass and daughter tiller number was recommended as an effective and simple index to predict the relative competitive ability for clonal plants. It was based on the regression for RY above and RYbelow (the belowground relative yield) against RY (relative yield), measured as yield in mixture divided by that in monoculture.

4

Temporal-spatial pattern and influencing factors of China’s province-level transport sector carbon emissions efficiency

81%

Peng Z., Wu Q., Wang D., Li M.

Polish Journal of Environmental Studies

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2020

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tom 29

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nr 1

5

MiR-140-5p inhibits the proliferation, migration and invasion of vascular smooth muscle cells by suppressing the expression of NCKAP1

81%

Ma Q., Liu J., Li C., Wang D.

Folia Histochemica et Cytobiologica

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2021

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tom 59

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nr 1

6

Variations in Cd and Pb accumulations of hot pepper (Capsicum annuum L.) cultivars for screening pollution- and nitrate-safe cultivars

81%

Chen L., Cui Z.-X., Wang D.

Polish Journal of Environmental Studies

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2020

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tom 29

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nr 4

7

Novel combinatorial transdermal drug delivery of alendronate with risedronate for the treatment of osteoporosis

81%

Kong F., Jia B., Cui P., Wang D.

Acta Biochimica Polonica

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2019

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tom 66

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nr 4

8

Electrospinning synthesis of hydroxyapatite nanofibers assembled from nanorods and their adsorption for heavy metal ions

81%

Zhou Y., Li S., Wang D., Han X.

Polish Journal of Environmental Studies

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2019

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tom 28

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nr 2

In this work, porous HAP nanofibers assembled from nanorods were developed as potential devices for the treatment of Cu(II), Cd(II), and Pb(II) contamination of consumable waters. Two steps were employed in the HAP nanofibers fabrication. First, rod-like HAP nanoparticles were synthesized through a chemical pathway from Ca(NO₃)₂ ·4H₂O, (NH₄)₂ HPO₄, and polyvinylpyrrolidone (PVP) as a capping agent. The subsequent electrospinning was performed to fabricate the PVP/HAP hybrid nanofibers as precursors to obtain pure HAP nanofibers assembled from nanorods via a calcination process. The effects of PVP dosage on morphology was investigated. And a possible formation mechanism of rod-like HAP was proposed. Then the removal efficiency of porous HAP nanofibers toward Cu(II), Cd(II), and Pb(II) were evaluated via sorption kinetics and sorption isotherms. Our results proved that the sorption kinetic data were well fitted by the pseudo second-order rate equation, and the adsorption of Cu²⁺, Cd², and Pb²⁺ ions on HAP nanofibers correlated well with the Langmuir equation as compared to Freundlich isotherm equation under the concentration range studied. These novel porous HAP nanofibers assembled from nanorods promise a feasible advance in the development of new, easy to handle, and low-cost water purifying methods.

9

Evaluating the relationship between phosphorus bioavailability and phosphorus speciation in sediments from rural rivers in the Taihu Lake area, China

81%

Bo L., Wang D., Zhang G., Wang C.

Polish Journal of Environmental Studies

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2014

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tom 23

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nr 6

The concentrations of different phosphorus (P) species and four kinds of bioavailable P (algae-available P, AAP; Olsen P, OLP; water-soluble P, WSP; and readily desorbable P, RDP) were determined to investigate the relationship between phosphorus bioavailability and phosphorus speciation in sediments from rural rivers in Taihu Lake area, China, using a European Commission “Standards Measurements and Testing Program” protocol and four chemical extraction techniques. The total P and inorganic P concentrations in the sediments were 179-2,293 mg/kg and 137-1,857 mg/kg, respectively. The concentrations of the P species in the sediments followed the order NaOH- extractable P > HCl-extractable P > organic P. The bioavailable P concentrations followed the order AAP (340 mg/kg) > OLP (38.7 mg/kg) > WSP (1.8 mg/kg) > RDP (0.3 mg/kg). Regression analyses showed that there were good correlations between the P species concentrations and the bioavailable P concentrations measured using the four different methods, except for between WSP and the HCl-extractable P concentrations. The OLP concentrations had highly significant correlations with AAP, WSP, RDP and the P species concentrations. The OLP method was found to be most suitable for determining the bioavailability of P species under the prevalent geochemical conditions in the rural river sediments that were analyzed.

10

Metabolism and thermoregulation in the Mongolian gerbil Meriones unguiculatus

81%

Wang D., Wang Y., Wang Z.

Acta Theriologica

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2000

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tom 45

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nr 2

Oxygen consumption, thermal conductance and body temperature of Meriones unguiculatus (Milne-Edwards, 1867) were measured at a temperature range from 5 to 40°C. The lowest mean metabolic rate tBMR) was 2.13 ± 0.14 ml02 g~ 1 h , which is higher than the predicted values based on their body mass. The thermal neutral zone (TNZ) was 26 to 38°C. Mean body temperature below the TNZ was 38.4 ± 0.5°C. Mean thermal conductance below the TNZ was 0.179 ± 0.037 ml02 g-1 • h-1 • °C which is also higher than predicted values based on their body mass. Thermoregulatory characteristics of Mongolian gerbils are very different from that found in arid-adapted small mammals. The extreme severe climate perhaps is the main selective force faced by Mongolian gerbils during their evolution with their macroenvironments.

11

Behavioural reaction of root vole [Microtus oeconomus Pallas] males of different social ranks to familiar and novel odour of conspecific males

81%

Sun P., Zhao Y., Zhao X., Wang D.

Polish Journal of Ecology

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2007

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tom 55

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nr 3

In this experiment, we tested the hypothesis that males of root voles (Microtus oeconomus Pallas) of different social ranks display different behavioural strategies. To document behavioural differences between social ranks, we investigated patterns in the behavioural responses to urine cues from familiar and novel individuals in a choice maze. Ten pairs of male voles were effectively used in this experiment. All behaviour was recorded with OBSERVER 5.0. When experiment was finished, video tapes were transformed into digital data. Then all data were analyzed by SPSS. The results showed that the approach latency of subordinates was shorter for familiar odours than novel ones, dominant individuals preferentially entered the strange odourant box, subordinates preferred familiar odours over novel ones, subordinates spent more time visiting familiar odours compared to the novel odours, dominants preferred novel odours to familiar ones, subordinates approached familiar odours more frequently than novel ones and self-groomed more often in the familiar odourant box than in the novel box, and dominant and subordinate individuals showed significantly different countermarking behaviours to familiar and novel odours. In conclusion, the dominants and subordinates displayed different behaviour patterns when faced to familiar and novel conspecific males’ urine cues. The data support our hypothesis that differences in social rank induce differences in behavioural patterns.

12

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Regulation of cyclooxygenase isoforms in the renal thick ascending limb: effects of extracellular calcium

81%

Wang D., McGiff J. C., Ferreri N. R.

Journal of Physiology and Pharmacology

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2000

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tom 51

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nr 4,1

13

Comparative proteomic analysis of cold-induced sweetening in potato (Solanum tuberosum L.) tuber

72%

Cheng L., Zhang X., Zhao Q., Li H., Wang Y., Wang D., Wang D., Zhang F.

Acta Physiologiae Plantarum

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2014

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tom 36

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nr 05

Cold-induced sweetening is one of the major factors limiting the quality of fried potato products. To understand the mechanisms of protein regulation for cold-induced sweetening in potato tubers, a comparative proteomic approach was used to analyse the differentially expressed proteins both during control (25°C, 30 days) and cold treatment (4°C, 30 days) using two-dimensional gel electrophoresis. Quantitative image analyses indicated that there were 25 protein spots with their intensities significantly altered more than twofold. Of these proteins, 9 were up-regulated, 13 were down-regulated, 2 were absent, and 1 was induced in the coldstored tubers. The MALDI-TOF/TOF MS analyses led to the identification of differentially expressed proteins that are involved in several processes and might work cooperatively to maintain metabolic homeostasis in tubers during low-temperature storage. The preponderance of metabolic proteins reflects the inhibition of starch re-synthesis and the accumulation of sugars in carbon fluxes, linking starch–sugar conversion. The respiration-related proteins suggest the transfer of respiratory activity from aerobic respiration to anaerobic respiration in the cold-stored tubers. The proteins associated with defence appear to protect the tuber cells from low-temperature stress. Some heat shock proteins that act as chaperones also displayed a differential expression pattern, suggesting a potentially important role in cold-stored tubers, although their exact contribution remains to be investigated. The proposed hypothetical model might explain the interaction of these differentially expressed proteins that are associated with cold-induced sweetening in tubers.

14

Effect of hydrogen sulfide on D1 protein in wheat under drought stress

71%

Li H., Gao M. Q., Xue R. L., Wang D., Zhao H. J.

Acta Physiologiae Plantarum

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2015

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tom 37

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nr 11

Drought usually induces plant growth inhibition and oxidative damage. This report showed the protections of hydrogen sulfide (H2S) against drought-induced damage in wheat, which was manifested in the better growth, higher relative water content (RWC), lower thiobarbituric acid-reactive substances (TBARS), and hydrogen peroxide (H2O2) as well as the increased activities of superoxide dismutase (SOD) and catalase (CAT). Drought often causes photosystem II (PS II) damage, which was observed in the decreased potential photochemical efficiency (Fv/Fm), actual photochemical efficiency (ΦPS II), photochemical quenching (qP), electron transfer rate (ETR), and increased non-photochemical quenching (qN), however, these effects could be alleviated by NaHS (H2S donor). D1 protein in PS II reaction center is the most sensitive target of PS II damage. Compared to water treatment, a higher level of transcription but less D1 protein and phosphorylated D1 protein was detected in wheat leaves when exposed to NaHS under drought stress, which may result from the higher expression of STN8 (catalyze D1 protein phosphorylation) and D1 protein degradationrelated gene (Deg1, Deg5, Deg8, FtsH2, and FtsH5). These results suggested that H2S alleviated drought-induced PS II damage owing to fast D1 protein turnover rather than D1 protein content.

15

Control of potato tuber dormancy and sprouting by expression of sense and antisense genes of pyrophosphatase in potato

71%

Si H., Zhang C., Zhang N., Wen Y., Wang D.

Acta Physiologiae Plantarum

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2016

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tom 38

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nr 03

16

Effects of drought stress on the antioxidant system, osmolytes and secondary metabolites of Saposhnikovia divaricata seedlings

71%

Men Y., Wang D., Li B., Su Y., Chen G.

Acta Physiologiae Plantarum

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2018

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tom 40

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nr 11

17

Nitrogen utilization characteristics and their influence on groundwater in the Weishan Irrigation Region

61%

Zhao Z., Jia Z., Guan Z., Zheng F., Wei T., Wang D.

Polish Journal of Environmental Studies

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2020

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tom 29

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nr 6

18

Residues and distributions of organochlorine pesticides in China's Weihe River

61%

Wang D., Yang S., Wang G., Gao L., Wang Y., Jiang Q., Chen Y.

Polish Journal of Environmental Studies

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2016

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tom 25

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nr 3

To exam ine the residues and distributions of hexachlorocyclohexanes (HCHs), dichlorodiphenyltrichloroethane (DDT), and other organochlorine pesticides (OCPs ) in the Weihe River basin of northwest China, a gas chromatography-mass spectrometer (GC-MS) was employed to analyze the samples collected from surface water, suspended solids, and sediments. Results showed that total concentrations of HCHs, DDT, and othe r OCPs in surface water were in the range of 2.41-178.18, 0.94-116.83, and 3.64-37.17 ng/L, respectiv ely; in suspended solids they were 5 1.76-241.23, 2.82-12.23, and 11.35-37.67 ng/L, respectively; and in sediments they were 74.13-517.49, 1.20-370.98, and 7.94-110.13 ng/g dry weight, respectively. The α-HCH/γ-HCH ratio indicated that historical usage of technical mixtures of HCHs was the main source of HCHs. The DDT ratio indicated that DDT at most sites came from older uses of technical DDT. Compared with some guideline values of OCPs in surface water, the concentrations of HCHs and DDT were at safe levels. Meanwhile, the Weihe Riv er sediments have high ecological risk pesticides.

19

A simple and efficient method for obtaining transgenic soybean callus tissues

61%

Liu D., Liu S., Chang D., Wang D., Wang N. N., Wang L.

Acta Physiologiae Plantarum

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2013

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tom 35

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nr 07

In the present study, a simple and efficient method for obtaining transgenic callus tissues of soybean [Glycine max (L.) Merr.] was developed based on Agrobacterium-mediated transformation. Hypocotyl segments of soybean were used as the starting material. Several factors such as soybean genotype, Agrobacterium concentration, inoculation time, co-cultivation period and addition of antioxidants in co-cultivation medium affecting the transformation efficiency were examined. The explants were cultured on callus induction medium containing 0.5 mg L-1 6-benzylaminopurine and 2.0 mg L-1, 2,4- Dichlorophenoxyacetic acid for callus induction. Callus tissues were induced at both the acropetal and basipetal ends. CaMV35S::GUS and CaMV35S::GFP transgenic callus tissues were obtained using the optimized protocol. The average transformation efficiency reached up to 87.7 %based onGUS detection. From inoculation with Agrobacterium to obtaining transgenic soybean callus will take about 3 weeks. In order to validate this method for gene function investigation, GVG::GmSARK transgenic soybean callus tissues were obtained and their senescence-associated phenotypes were assessed. To our knowledge, this is the first report using hypocotyl segments as starting materials to obtain transgenic callus, and this system provides a method for high-throughput screening of functional genes of interest in transformed soybean callus.

20

Comparison of ultrastructural and physiological changes of potato (Solanum tuberosum L.) plantlets subjected to salt and modeling drought stresses

61%

Bai J.-P., Gao H.-J., Yang H.-Y., Lou Y., Zhang J.-L., Wang D., Zhang J.-L.

Acta Physiologiae Plantarum

|

2016

|

tom 38

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nr 07

Ograniczanie wyników

Climate change, the evaporation paradox, and their effects on streamflow in Lijiang watershed

Seasonal variations in thermogenesis and energy requirements of plateau pikas Ochotona curzoniae and root voles Microtus oeconomus

Effects of nutrient availability and competition between two grass species Leymus chinensis [Trin.] Tzvel. and Phragmites communis Trin. on the plant performance

Temporal-spatial pattern and influencing factors of China’s province-level transport sector carbon emissions efficiency

MiR-140-5p inhibits the proliferation, migration and invasion of vascular smooth muscle cells by suppressing the expression of NCKAP1

Variations in Cd and Pb accumulations of hot pepper (Capsicum annuum L.) cultivars for screening pollution- and nitrate-safe cultivars

Novel combinatorial transdermal drug delivery of alendronate with risedronate for the treatment of osteoporosis

Electrospinning synthesis of hydroxyapatite nanofibers assembled from nanorods and their adsorption for heavy metal ions

Evaluating the relationship between phosphorus bioavailability and phosphorus speciation in sediments from rural rivers in the Taihu Lake area, China

Metabolism and thermoregulation in the Mongolian gerbil Meriones unguiculatus

Behavioural reaction of root vole [Microtus oeconomus Pallas] males of different social ranks to familiar and novel odour of conspecific males

Regulation of cyclooxygenase isoforms in the renal thick ascending limb: effects of extracellular calcium

Comparative proteomic analysis of cold-induced sweetening in potato (Solanum tuberosum L.) tuber

Effect of hydrogen sulfide on D1 protein in wheat under drought stress

Control of potato tuber dormancy and sprouting by expression of sense and antisense genes of pyrophosphatase in potato

Effects of drought stress on the antioxidant system, osmolytes and secondary metabolites of Saposhnikovia divaricata seedlings

Nitrogen utilization characteristics and their influence on groundwater in the Weishan Irrigation Region

Residues and distributions of organochlorine pesticides in China's Weihe River

A simple and efficient method for obtaining transgenic soybean callus tissues

Comparison of ultrastructural and physiological changes of potato (Solanum tuberosum L.) plantlets subjected to salt and modeling drought stresses