Wyniki wyszukiwania

1

Netz-Phytoplankton Diversity in the western and Southern regions of the South China Sea

100%

Liu H., Sun J.

Oceanological and Hydrobiological Studies

|

2015

|

tom 44

|

nr 4

2

Passive localization for mixed-field moving sources

100%

Gao C., Liu H.

Polish Maritime Research

|

2018

|

tom 25

|

nr Special Issue S2

Due to the mobility of underwater equipment, high-precision underwater positioning technology will face two technical challenges: dealing with mixed-field signals composed of near-field signals and far-field signals; adapting to variable component of mixed-field signals considering the mobility of equipment. Under this condition, an effective method based on MUSIC is addressed in this paper. After distinguishing far-field signal subspace from mixed-field signal subspace, estimations of DOAs and powers of far-field sources are carried out. Then the corresponding far-field and noise signal components can be eliminated from the signal subspace. After that, based on path-following algorithm, modified 2D-MUSIC is performed for DOA and range estimations of near-field sources. The performance of the proposed method is verified and compared with the other methods through computer simulations. Reasonable classification of source types and accurate localization estimation can be achieved by using the proposed method

3

Acute thymic involution and mechanisms for recovery

100%

Ansari A. R., Liu H.

Archivum Immunologiae et Therapiae Experimentalis

|

2017

|

tom 65

|

nr 5

4

Composition of ethyl acetate extracts from three plant materials (shaddock peel, pomegranate peel, pomegranate seed) and their algicidal activities

85%

Wang H., Kang H., Zhang L., Cheng S., Liu H., Liu H., Sun B.

Polish Journal of Environmental Studies

|

2015

|

tom 24

|

nr 4

Many studies have involved the isolation and identification of allelochemicals from aquatic plants, but the algicidal properties of terrestrial plants have received less attention. This study aims to identify allelochemicals of ethyl acetate extracts from three plant materials (shaddock peel, pomegranate peel, pomegranate seed) and to investigate their inhibitory effects on Microcystis aeruginosa. The ethyl acetate extracts of the three plant materials were identified by GC-MS. Finally, 19 kinds of compounds (including organic acids, ester, ketone, sterol, etc.) were obtained and eight kinds of organic acids and N-phenyl-2-Naphthalenamine were proved to be allelochemicals. The inhibitory effects of the ethyl acetate extracts were also explored by M. aeruginosa bioassay. This showed that the inhibition percentages of ethyl acetate extracts of the three plant materials on the growth of M. aeruginosa were 43.9%, 47.5%, and 40.3%, respectively, when the algae were treated at a dosage of 20 mg/L extracts.

5

Development of a 12-biomarkers-based prognostic model for pancreatic cancer using multi-omics integrated analysis

81%

Jia J., Shen M., Zhou Y., Liu H.

Acta Biochimica Polonica

|

2020

|

tom 67

|

nr 4

6

Characteristic studies of micron zinc particle hydrolysis in a fixed bed reactor

81%

Lv M., Liu H., Nie X., Ashraf M. A.

Polish Maritime Research

|

2015

|

tom 22

|

nr Special Issue S1

Zinc fuel is considered as a kind of promising energy sources for marine propeller. As one of the key steps for zinc marine energy power system, zinc hydrolysis process had been studied experimentally in a fixed bed reactor. In this study, we focus on the characteristics of micron zinc particle hydrolysis. The experimental results suggested that the steam inner diffusion is the controlling step of accumulative zinc particles hydrolysis reaction at a relative lower temperature and a relative higher water partial pressure. In other conditions, the chemical reaction kinetics was the controlling step. And two kinds of chemical reaction kinetics appeared in experiments: the surface reaction and the gas-gas reaction. The latter one occurs usually for larger zinc particles and high reaction temperature. Temperature seems to be one of the most important parameters for the dividing of different reaction mechanisms. Several parameters of the hydrolysis process including heating rate, water partial pressure, the particle size and temperature were also studied in this paper. Results show that the initial reaction temperature of zinc hydrolysis in fixed bed is about 410 oC. And the initial reaction temperature increases as the heating rate increases and as the water partial pressure decreases. The total hydrogen yield increases as the heating rate decreases, as the water partial pressure increases, as the zinc particle size decreases, and as the reaction temperature increases. A hydrogen yield of more than 81.5% was obtained in the fixed bed experiments

7

Construction of waveform library in cognitive radar

81%

Guo Y., Wu Y., Liu H.

Polish Maritime Research

|

2017

|

tom 24

|

nr Special Issue S2

Based on the thoughts of cognitive radar, Fractional Fourier Transform (FrFT) is used to generate a rotatable waveform libraries of Frank coded/Barker coded waveform in this paper. Then, the ambiguity function is used to analyze the delay resolution, Doppler resolution, delay side-lobe level, and Doppler side-lobe level of the waveform libraries and orthogonality of them is also analyzed. Furthermore, we proved theoretically that there is a fixed coordinate transformation between the waveforms of library and its origin waveform. Therefore, the Cramér-Rao low bound (CRLB) of motion parameters can be computed easily using the waveforms of the libraries, which facilitate the subsequent waveform scheduled work. Simulation results show that the library waveforms can reduce delay resolution to satisfy the different situations and can bring significant benefits for delay resolution, orthogonality and reuse interval

8

Spatial distribution and influence analysis of soil heavy metals in a hilly region of sichuan basin

81%

Liu H., Liu G., Zhou Y., He C.

Polish Journal of Environmental Studies

|

2017

|

tom 26

|

nr 2

The hilly region of the Sichuan basin has unique natural topography, geomorphology, geology, and hydrology, with intensive human activities in the area. Therefore, it is of great significance to carry out research on heavy metal characteristics. In this study, taking five villages of Zigong city as a sample, the content of eight kinds of heavy metals in soil was determined (Cu, Cd, As, Pb, Cr, Zc, Ni, and Hg) based on ordinary Kriging. The results showed that Cd, Pb, Ni, and Zn content in the research area was higher than the background value and had a good concentration with all of the heavy metal contents lying within the national standards. Through soil parent material, soil environment, atmospheric environment, and water environment analysis of heavy metals, it was found that higher levels of heavy metals in the research area were mainly affected by agricultural and industrial activities (atmospheric dustfall). This was generally where there were intense areas of human activity – especially in and around transport routes and construction areas. It was also found that the soybean crop exhibited a strong Cd accumulation ability. This soybean planting should be reduced to control the distribution of Cd. Zn and Cu had a positive enrichment effect on rice, soybeans, and other crops, and had little enrichment effect on grapefruit. This study showed the effect human activities have on the quality of soil quality on the crop. This research has great significance for the ecologically sustainable development of society.

9

Predicting gaseous pollution of sintered brick preparation from yellow phosphorus slag

81%

Jiang M., Liu H., Fan X., Wang Z.

Polish Journal of Environmental Studies

|

2019

|

tom 28

|

nr 3

To investigate secondary pollution issued during the preparation of sintered brick from waterquenched yellow phosphorus slag, the composition of slag was experimentally measured in this study. The thermal conversion process and gas phase products associated with S-, P-, F-, and As-containing species present in the heating system were theoretically calculated by means of thermochemical software FactSage 7.0 and databases. The results showed that F and As were released at 700ºC and the gaseous products contained AsF₃. Also, large amounts of F remained in solid CaF₂ and Ca₁₀(PO₄)₆F₂. At a calcination temperature of 900ºC, all As was transferred into gaseous AsF₃ and S started to convert into gaseous SO₂ and SO₃. Other data suggested that the released amounts of SO₂ and SO₃ increased as calcination temperature rose. At calcination temperatures ranging from 100-1000ºC, all P existed as solid Ca₁₀(PO₄)₆F₂. These findings indicated that low calcination temperatures were beneficial for reducing released harmful gases during the production of sintered brick.

10

Effect of sunny/shady slopes on phases of precipitation in China’s Tianshan Mountains

81%

Fan X., Liu H., Chen X., Wang L.

Polish Journal of Environmental Studies

|

2019

|

tom 28

|

nr 3

Precipitation is an important element in the hydrological cycle in mountainous regions. Temporal and spatial variations in precipitation and in its two phases – rain and snow – over the northern and southern aspects of the slopes of the Tianshan Mountains are compared and analyzed using 55-year data (1961-2015). The results of the analysis are as follows: 1) The average annual precipitation shows an upward trend: rainfall on the northern slopes increase by 6.7 mm per decade and that on the southern slopes by 6.4 mm per decade; the corresponding figures for snow are 2.0 mm and 4.2 mm; and the ratio of snowfall to precipitation (S/P) showed a weak decreasing trend on both the slopes. 1) At a confidence level of 0.05, the M-K test shows that rain, snow, and S/P increased after the change point, while rain and snow change significantly in the proportions,but S/P does not. 2) On the northern slopes, the periodicity of major changes is 25 years for rain and 30 years for snow, whereas on the southern slopes the pattern is the exact opposite, the periodicity of major changes being 25 years for rain and 30 years for snow.

11

Comparison of ginsenoside composition in native roots and cultured callus cells of Panax quinquefolium L.

81%

Wang J., Liu H., Gao W.-Y., Zhang L.

Acta Physiologiae Plantarum

|

2013

|

tom 35

|

nr 04

In order to compare the ginsenoside composition in native Panax quinquefolium and in suspension cultured cells derived from root callus, HPLC–ESI-MSn analysis was performed. Under the present HPLC–ESI-MSn conditions, ten ginsenosides from native root were acquired in the positive and negative ion modes, namely Rg1, Re, Ro, malonyl- Rb1, Rf, Rb1, Rc, Rb2, Rb3 and Rd. Only four ginsenosides (Rg1, Re, Rf and Rb1) were identified from callus cells. Radical scavenging activity of P. quinquefolium callus cells with 250 mg l-1 methanolic extract on 1,1-diphenyl-2- picrylhydrazyl (DPPH) was 55.72 %, while only 6.31 % DPPH inhibition was obtained in native root.

12

Stability analysis of landfill under multi-point seismic ground motions considering the effect of leachate

81%

Shang W., Sun S., Liu H., Zheng J.

Polish Journal of Environmental Studies

|

2020

|

tom 29

|

nr 2

13

Using the RS method to analyse construction land changes in Tongren during 2002 and 2016

81%

Liu H., Zhang y., Zhang X.

Polish Journal of Environmental Studies

|

2019

|

tom 28

|

nr 3

Timely and accurately obtained regional construction land information for environmental protection, ecological construction, and regional planning is important. In this study, we used Landsat7 ETM+ images acquired in 2002 and Landsat8 images acquired in 2016 as data sources, and performed maximum likelihood classification and class masking in order to extract construction land information in Tongren. The experimental results showed that the construction land of the study area was 306.07 km² in 2002 and 675.15 km² in 2016. This shows an increase of 369.08 km², which marks an increase by 120.59%, while the expansion ratio was quite larger. Construction land was mainly transferred from cultivated land (338.65 km²), and shows that large areas of cultivated land were replaced by construction land. The main reason for the construction land increase was urban expansion, and the county expansion ratio was between 3.72 and 7.92. Road construction, mining destruction, and residential expansion are additional reasons, but these have caused smaller changes to the area of construction land, with a change ratio of only 0.34. In mountainous Karst areas, urban expansion may cause ecological problems; therefore, we should protect the natural environment and maintain the landscape in its original state so as not to cause excessive disturbance to land resources.

14

MiRNA-621 exerts tumor suppressor function in gastric adenocarcinoma by targeting AURKA/GSK-3beta pathway

81%

Han X., Liu H., Tang X., Zhao Y.

Acta Biochimica Polonica

|

2021

|

tom 68

|

nr 1

15

MiR-30b is involved in methylglyoxal-induced epithelial-mesenchymal transition of peritoneal mesothelial cells in rats

81%

Liu H., Zhang N., Tian D.

Cellular and Molecular Biology Letters

|

2014

|

tom 19

|

nr 2

Epithelial-mesenchymal transition (EMT) of peritoneal mesothelial cells (PMC) is a major contributor to the pathogenesis of peritoneal fibrosis. EMT is at least in part caused by repeated exposure to glucose degradation products (GDPs), such as methylglyoxal (MGO). MiRNA contributes greatly to the EMT of PMCs. In this study, we tried to profile whether differences exist between the peritoneal membrane (PM) miRNA expression seen in control rats and that seen in rats injected intraperitoneally with MGO. We assessed whether miR-30b has a possible role in MGO-induced EMT of PMCs in rats. Comparative miRNA expression array and real-time PCR analyses were conducted for the control group at the start of the experiment and for the MGO group after 1 and 2 weeks. During the second week, the MGO rats were treated with: a chemically modified antisense RNA oligonucleotide (ASO) complementary to the mature miR-30b (ASO group); an miR-30b mismatch control sequence (MIS group); or a citrate buffer (EMT group). Bioinformatic analyses indicated that the 3′ untranslated region (3′-UTR) of bone morphogenetic protein 7 (BMP7) mRNA did contain a putative binding site for miR-30b. We also tried to investigate whether miR-30b targeted BMP7 in vitro by transfection. Of the upregulated miRNAs, miR-30b expression demonstrated the greatest increase. The administration of miR-30b ASO for two weeks significantly reduced α-SMA excretion and upregulated E-cadherin and BMP-7 expression. Our in vitro study showed that miR-30b directly targeted and inhibited BMP7 by binding to its 3’-UTR. Our results revealed that miR-30b is involved in MGO-induced EMT of PMCs in rats.

16

Quantitative analysis of the relationship between shear strength and fractal dimension of solidified dredger fill with different fly ash content under monotonic shear

81%

Yang S., Liu W., Liu H.

Polish Maritime Research

|

2018

|

tom 25

|

nr Special Issue S2

The dredger fill of Shanghai Hengsha Island Dongtan is solidified by curing agents with different fly ash content, and the shear strength index of solidified dredger fill is measured by the direct shear test. The microscopic images of solidified dredger fill are obtained by using SEM. The microscopic images are processed and analyzed by using IPP, and the fractal dimension including particle size fractal dimension Dps, aperture fractal dimension Dbs and particle surface fractal dimension Dpr is calculated by fractal theory. The quantitative analysis of the relationship between shear strength index and fractal dimension of solidified dredger fill is done. The research results show that the internal friction angle and the cohesion are closely related to the fly ash content λ and the curing period T, and the addition of fly ash can improve the effect of curing agent; There is no obvious linear relationship between the internal friction angle and the three fractal dimensions; The smaller particle surface fractal dimension Dpr and particle size fractal dimension Dps, the larger aperture fractal dimension Dbs, the greater the cohesion, and the cohesion has a good linear relationship with three fractal dimensions, and the correlation coefficient R2 is above 0.91

17

Group 3 late embryogenesis abundant protein in Arabidopsis: structure, regulation, and function

81%

Zhao P. S., Liu F., Zheng G. C., Liu H.

Acta Physiologiae Plantarum

|

2011

|

tom 33

|

nr 4

Group 3 late embryogenesis abundant proteins accumulate in maturing seeds, in which their expression correlates with desiccation tolerance. Group 3 proteins are also strongly associated with tolerance for abiotic stresses, such as high salinity, drought, cold, and osmotic stress in vegetative tissues. However, the precise function of these proteins remained obscure for more than 20 years. In this study, the structure of and available regulation information on Group 3 genes/proteins in Arabidopsis are reviewed. The function of Group 3 proteins in response to desiccation and the relationship between protein structure and function are also discussed.

18

Influence of the Three Gorges Reservoir on the vegetation of its drawdown area: effects of water submersion and temperature on seed germination of Xanthium sibiricum (Compositae)

81%

Wang Q., Yuan X., Liu H.

Polish Journal of Ecology

|

2014

|

tom 62

|

nr 1

Xanthium sibiricum, an annual weed, unexpectedly and dramatically occupied the exposed drawdown area after water had been impounded for the first time in the newly created Three Gorges Reservoir in China. In order to explain this phenomenon and establish an appropriate management strategy, the effects of constant submersion on seed viability and germination of X. sibiricum were investigated at two constant temperature regimes (25oC and 30oC) under artificial laboratory conditions. The results indicated that the seeds of X. sibiricum exhibited a high level of tolerance of submersion and up to 99% of seeds were viable in each treatment regime. The effect of submersion on germination was not obvious at 25oC until the submersion was prolonged for 180 days, while at 30oC the eventual germination rate of X. sibiricum, even after submergence for only one day, was significantly improved. The speed of germination was also consistently accelerated by prolonged periods of submersion. The proportion of seeds that germinated in all treatments combined was less that 56% due to seed dimorphism, thereby providing a seed bank. We conclude that the interaction between long-term winter flooding and high temperature in summer is the major reason that X. sibiricum was able to occupy the newly exposed drawdown area in the absence of competition. These findings provided further insight into how germination strategy and reservoir water-management regime contributed to this dramatic species outbreak.

19

Influence of arbuscular mycorrhiza on photosynthesis and water status of Populus cathayana Rehder males and females under salt stress

81%

Wu N., Li Z., Liu H., Tang M.

Acta Physiologiae Plantarum

|

2015

|

tom 37

|

nr 09

The influence of arbuscular mycorrhizal fungi (AMF) Rhizophagus irregularis on biomass, root morphological characteristics, water status, gas exchange and ion contents of Populus cathayana Rehder males and females under salt stress was studied in a greenhouse experiment. Sex had no influence on AMF colonization. Salt stress decreased the biomass, modified root characteristics, inhibited photosynthesis, relative water content (RWC), while increased the water use efficiency (WUEi), the ratio of root/shoot (RSR) and salt ion contents within the plants. Males and females differed in response to the salt stress and AMF inoculation. AMF inoculation increased the biomass of root, the biomass of shoot, and decreased RSR, especially in males. The root length, root volume (RV), root surface area, and root tip numbers (RTN) were increased with AMF inoculation in males, while RV and RTN were decreased with AMF inoculation in females. AMF had positive effects on RWC and WUEi in both sexes. Mycorrhizal cuttings also had higher gas exchange capacity, lower salt ion contents than non-mycorrhizal cuttings. The principal component analysis showed that males exhibited a better salt tolerance than females, and AMF inoculation had positive effects on both sexes, especially in males.

20

Redescription of the little known reduviid, Tiarodes elegans Stal, 1863 [Heteroptera: Reduviidae: Reduviinae]

81%

Li P., Liu H., Cai W.

Annales Zoologici

|

2005

|

tom 55

|

nr 1

The little known reduviine species, Tiarodes elegatis Stål, 1863, is redescribed based on the material from Sri Lanka. The characters of male genitalia are reported for the first time. The dorsal habitus, head, male genitalia and other diagnostic morphological features are illustrated.

Ograniczanie wyników

Netz-Phytoplankton Diversity in the western and Southern regions of the South China Sea

Passive localization for mixed-field moving sources

Acute thymic involution and mechanisms for recovery

Composition of ethyl acetate extracts from three plant materials (shaddock peel, pomegranate peel, pomegranate seed) and their algicidal activities

Development of a 12-biomarkers-based prognostic model for pancreatic cancer using multi-omics integrated analysis

Characteristic studies of micron zinc particle hydrolysis in a fixed bed reactor

Construction of waveform library in cognitive radar

Spatial distribution and influence analysis of soil heavy metals in a hilly region of sichuan basin

Predicting gaseous pollution of sintered brick preparation from yellow phosphorus slag

Effect of sunny/shady slopes on phases of precipitation in China’s Tianshan Mountains

Comparison of ginsenoside composition in native roots and cultured callus cells of Panax quinquefolium L.

Stability analysis of landfill under multi-point seismic ground motions considering the effect of leachate