16 results on '"Xiuqin, Hu"'
Search Results
2. Niche characteristics and dynamics of dominant species in arbor layer of 4hm2Pinus tabuliformis-Quercus wutaishansea mixed forest in Lingkong Mountain
- Author
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Lu Ni, Donggang Guo, Quanxi Zhang, Yan Li, Xiuqin Hu, Yun Li, and Senxia Feng
- Subjects
arbor layer ,importance value ,niche width ,niche overlap ,niche similarity ,dynamic study ,Evolution ,QH359-425 ,Ecology ,QH540-549.5 - Abstract
The ability of community species to adapt to the environment and use resources and the importance of species in the ecological system in time and space are generally represented by ecological niche. In order to study the niche characteristics and dynamic changes of the dominant species in the arbor layer of the 4hm2Pinus tabuliformis-Quercus wutaishansea mixed forest sample plot in Lingkong Mountain,and to gain a better understanding of the competition and coexistence among species in the sample plot, this study was conducted based on a typical community investigation. Four indices of important value, niche width, niche overlap, and niche similarity were chosen to calculate and analyze the niche characteristics and examine dynamic changes over a period of 10 years from 2011 to 2021. The results showed that: (1) In 2021, the important values for Quercus wutaishansea and Pinus tabuliformis were 19.906 and 13.906, respectively.The niche widths were 0.962 and 0.555, which showed difference compared to those in 2011. Both were much larger than other species, indicating that they occupied an absolutely dominant position in the community. (2) The mean values of niche overlap and similarity of dominant species in the arbor layer of the Lingkong Mountain sample plot have both increased over the past 10 years. Additionally, the species pairs with the highest overlap and similarity values have changed, suggesting an intensification of competition among these species.
- Published
- 2024
- Full Text
- View/download PDF
3. Niche characteristics and dynamics of dominant species in arbor layer of 4hm² Pinus tabuliformis-Quercus wutaishansea mixed forest in Lingkong Mountain.
- Author
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Lu Ni, Donggang Guo, Quanxi Zhang, Yan Li, Xiuqin Hu, Yun Li, Senxia Feng, Arteaga, Johny, and Pandey, Aseesh
- Subjects
MIXED forests ,MOUNTAIN forests ,COEXISTENCE of species ,PINE ,ECOSYSTEMS ,ECOLOGICAL niche - Abstract
The ability of community species to adapt to the environment and use resources and the importance of species in the ecological system in time and space are generally represented by ecological niche. In order to study the niche characteristics and dynamic changes of the dominant species in the arbor layer of the 4hm² Pinus tabuliformis-Quercus wutaishansea mixed forest sample plot in Lingkong Mountain,and to gain a better understanding of the competition and coexistence among species in the sample plot, this study was conducted based on a typical community investigation. Four indices of important value, niche width, niche overlap, and niche similarity were chosen to calculate and analyze the niche characteristics and examine dynamic changes over a period of 10 years from 2011 to 2021. The results showed that: (1) In 2021, the important values for Quercus wutaishansea and Pinus tabuliformis were 19.906 and 13.906, respectively.The niche widths were 0.962 and 0.555, which showed difference compared to those in 2011. Both were much larger than other species, indicating that they occupied an absolutely dominant position in the community. (2) The mean values of niche overlap and similarity of dominant species in the arbor layer of the Lingkong Mountain sample plot have both increased over the past 10 years. Additionally, the species pairs with the highest overlap and similarity values have changed, suggesting an intensification of competition among these species. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
4. Transcriptome sequencing and screening of genes related to sex determination of Trichosanthes kirilowii Maxim.
- Author
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Xiuqin Hu, Zhenyang Liao, Bo Zhang, JingJing Yue, Zhen Wang, Xin Jie, and Juan Liu
- Subjects
Medicine ,Science - Abstract
Trichosanthes kirilowii Maxim. (TK) is a dioecious plant in the Cucurbitaceae for which different sexes have separate medicinal uses. In order to study the genes related to sex determination, transcriptome sequencing was performed on flower buds of male and female plants using the high-throughput sequencing technology. A total of 145,975 unigenes and 7110 DEGs were obtained. There were 6776 DEGs annotated to 1234 GO terms and enriched to 18 functional groups, including five biological processes related to sugar metabolism. KEGG pathway analysis indicated genes involved in hormone transduction, hormone synthesis and carbohydrate metabolism. Many DEGs of TK are involved in reproductive organ formation, hormone signal transduction and regulatory networks. Combining the results of GO, KEGG and qRT-PCR, 11 sex determining candidate genes of TK were selected, including MYB80, MYB108, CER1, CBL9, ABCB19, SERK1, HSP81-3, ACS9, SEP3, AUX1 and YUC6. The results provide a foundation for the study of sex differentiation in TK.
- Published
- 2020
- Full Text
- View/download PDF
5. Design, Synthesis, and Evaluation of Ribose-Modified Anilinopyrimidine Derivatives as EGFR Tyrosine Kinase Inhibitors
- Author
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Xiuqin Hu, Disha Wang, Yi Tong, Linjiang Tong, Xia Wang, Lili Zhu, Hua Xie, Shiliang Li, You Yang, and Yufang Xu
- Subjects
EGFR ,tyrosine kinase inhibitors ,anilinopyrimidine ,glycosides ,carbohydrate-based drugs ,Chemistry ,QD1-999 - Abstract
The synthesis of a series of ribose-modified anilinopyrimidine derivatives was efficiently achieved by utilizing DBU or tBuOLi-promoted coupling of ribosyl alcohols with 2,4,5-trichloropyrimidine as key step. Preliminary biological evaluation of this type of compounds as new EGFR tyrosine kinase inhibitors for combating EGFR L858R/T790M mutant associated with drug resistance in the treatment of non-small cell lung cancer revealed that 3-N-acryloyl-5-O-anilinopyrimidine ribose derivative 1a possessed potent and specific inhibitory activity against EGFR L858R/T790M over WT EGFR. Based upon molecular docking studies of the binding mode between compound 1a and EGFR, the distance between the Michael receptor and the pyrimidine scaffold is considered as an important factor for the inhibitory potency and future design of selective EGFR tyrosine kinase inhibitors against EGFR L858R/T790M mutants.
- Published
- 2017
- Full Text
- View/download PDF
6. Photocatalytic [2+1+2] Tandem Reactions for the Synthesis of Dihydroimidazole and Its Mechanism Study
- Author
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Kexing Ma, Junjie Yang, Baicheng Chen, Yongwen Shen, Xiuqin Hu, and Pengfei Xu
- Subjects
General Medicine - Published
- 2023
7. Whitening Activity of Constituents Isolated from the Trichosanthes Pulp
- Author
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Zhen Wang, Rong-chao Zhang, Jie Xin, Chunxiang Hao, Xiuqin Hu, Guo Qingmei, and Bo Zhang
- Subjects
Antioxidant ,Chromatography ,Article Subject ,biology ,010405 organic chemistry ,medicine.medical_treatment ,010401 analytical chemistry ,biology.organism_classification ,Chrysoeriol ,01 natural sciences ,Diosmetin ,0104 chemical sciences ,Other systems of medicine ,chemistry.chemical_compound ,Complementary and alternative medicine ,chemistry ,Apigenin ,Vanillic acid ,medicine ,Quercetin ,Trichosanthes ,RZ201-999 ,Salicylic acid ,Research Article - Abstract
Whitening cosmetics market has a bright future, and pure natural whitening products of traditional Chinese medicine have always been a research hotspot. In this research, the whitening active ingredient of Chinese medicine Trichosanthes pulp was isolated and purified for the first time, and its whitening mechanism was clarified. Chromatographic methods such as silica gel, ODS, and HPLC were used to isolate and purify them. B16 cells were used to measure the antioxidant activity, tyrosinase activity, and melanin removal activity. A total of 20 compounds were isolated, including p-hydroxybenzaldehyde (1), salicylic acid (2), vanillic acid (3), isovanillic acid (4), protocatechuate (5), trans-cinnamic acid (6), 4-coumaric acid (7), trans-ferulic acid (8), drechslerol-B (9), cyclotucanol 3-palmitate (10), 5-acetoxymethyl-2-furaldehyde (11), 5-hydroxymethylfurfural (12), diosmetin (13), apigenin (14), chrysoeriol (15), luteolin (16), 4′-hydroxyscutellarin (17), quercetin (18), 3′,5-dihydroxy-7-(β-D-glucopyranosyloxy)-4′-methoxyflavone (19), and cofloxacin-7-O-β-D-glucoside (20). Among them, compounds 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, and 20 have good antioxidant repairing effects; compounds 3, 4, 5, 6, and 7 have high black inhibition; compounds 1, 2, 3, 4, 5, 6, 7, 8, 11, 12, 13, 14, 15, 16, 17, 18, 19, and 20 have obvious tyrosine acidase inhibitory activity. The results laid foundation for the further development and utilization of Trichosanthes pulp resources and also provide a basis for the development of natural whitening cosmetics.
- Published
- 2020
8. Capability of Fengyun-3D Satellite in Earth System Observation
- Author
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Na Xu, Leiku Yang, Shihao Tang, Dou Fangli, Peng Zhang, Songyan Gu, Ruixia Liu, Zhaojun Zhen, Sujuan Wang, Zhongdong Yang, Ling Zhu, Xiao Wu, Weihua Bai, Xiuqin Hu, Wu Qiong, Ling Wang, Liyang Zhang, and Yueqiang Sun
- Subjects
geography ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,Spectrometer ,010502 geochemistry & geophysics ,01 natural sciences ,Physics::Geophysics ,Atmosphere ,Earth system science ,Depth sounding ,Ocean color ,Physics::Space Physics ,Radiative transfer ,Sea ice ,Environmental science ,Satellite ,Astrophysics::Earth and Planetary Astrophysics ,Physics::Atmospheric and Oceanic Physics ,0105 earth and related environmental sciences ,Remote sensing - Abstract
From the viewpoint of earth system science, this paper discusses the observation capability of the second-generation of Chinese polar-orbiting, sun-synchronous operational meteorological satellite observation systems, Fengyun-3 (FY-3), based on the function and performance test results from the FY-3D satellite observation system in orbit. The FY-3 series of satellites have numerous remote sensing instruments and a wide range of imaging and sounding electromagnetic spectrometers onboard. These instruments can obtain reflectivity data for land surface, soil, vegetation, water body, snow cover, ocean color, and sea ice on earth’s surface over a wide spectral range, as well as information on the absorption and scattering radiative transfer of molecules and particles (clouds and aerosols) in earth’s atmosphere. All of these data can be used to retrieve physical and chemical information about the land, ocean, and atmosphere of the earth system. Comprehensive observation of the earth system by the FY-3 meteorological satellites is preliminarily realized.
- Published
- 2019
9. Influence of initial water content of dredged slurry on clogging effect under vacuum preloading
- Author
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Xiuqin Hu, Jun Wang, Wu Xiuliang, and Hongtao Fu
- Subjects
Materials science ,010504 meteorology & atmospheric sciences ,Consolidation (soil) ,Scanning electron microscope ,Metallurgy ,010502 geochemistry & geophysics ,01 natural sciences ,Clogging ,Pore water pressure ,Soil water ,Slurry ,General Earth and Planetary Sciences ,Water content ,0105 earth and related environmental sciences ,General Environmental Science - Abstract
Vacuum preloading is a commonly used method for improving the properties of soft clayey dredged slurry deposits. However, the clogging effect has a significant influence on the effectiveness of vacuum preloading. In this study, soils with initial water contents of 95, 86, 75, and 67 % were investigated to determine the corresponding clogging effect. The results indicated that the difference in water content between 30 and 120 mm from the prefabricated vertical drain (PVD) for initial water content of 67 % was 32.35, 38.18, and 51.43 % lesser than that for initial water contents of 75, 86, and 95 %, respectively. The dissipation in pore water pressure 75 mm from the PVD for initial water contents of 95, 86, and 75 % was respectively 24.21, 17.39, and 8.40 % lesser than that 30 mm from the PVD; however, the dissipation in pore water pressure for initial water content of 67 % decreased by 6.9 % after vacuum preloading. Comparing scanning electron microscope images of the specimens after vacuum preloading, the clogging of PVDs in soils with an initial water content of 67 % or less was not apparent. This result may be useful for those committed to the consolidation of dredged slurry.
- Published
- 2021
10. Transcriptome sequencing and screening of genes related to sex determination of Trichosanthes kirilowii Maxim
- Author
-
Zhen Wang, Xin Jie, Xiuqin Hu, Bo Zhang, Zhenyang Liao, Jingjing Yue, and Juan Liu
- Subjects
0106 biological sciences ,0301 basic medicine ,Candidate gene ,Physiology ,Gene Expression ,Plant Science ,01 natural sciences ,Biochemistry ,Transcriptome ,Endocrinology ,Plant Growth Regulators ,Gene Expression Regulation, Plant ,Medicinal Plants ,Morphogenesis ,Medicine and Health Sciences ,Gene Regulatory Networks ,Trichosanthes ,Flowering Plants ,Plant Proteins ,Genetics ,Multidisciplinary ,Sexual Differentiation ,Plant Anatomy ,High-Throughput Nucleotide Sequencing ,Eukaryota ,Plants ,RNA, Plant ,Medicine ,Carbohydrate Metabolism ,Buds ,Signal Transduction ,Research Article ,Science ,Flowers ,Biology ,03 medical and health sciences ,Hormone transport ,KEGG ,Gene ,Hormone Transport ,Sexual differentiation ,Endocrine Physiology ,Organisms ,Biology and Life Sciences ,Molecular Sequence Annotation ,biology.organism_classification ,Hormones ,030104 developmental biology ,Trichosanthes kirilowii ,010606 plant biology & botany ,Developmental Biology - Abstract
Trichosanthes kirilowii Maxim. (TK) is a dioecious plant in the Cucurbitaceae for which different sexes have separate medicinal uses. In order to study the genes related to sex determination, transcriptome sequencing was performed on flower buds of male and female plants using the high-throughput sequencing technology. A total of 145,975 unigenes and 7110 DEGs were obtained. There were 6776 DEGs annotated to 1234 GO terms and enriched to 18 functional groups, including five biological processes related to sugar metabolism. KEGG pathway analysis indicated genes involved in hormone transduction, hormone synthesis and carbohydrate metabolism. Many DEGs of TK are involved in reproductive organ formation, hormone signal transduction and regulatory networks. Combining the results of GO, KEGG and qRT-PCR, 11 sex determining candidate genes of TK were selected, including MYB80, MYB108, CER1, CBL9, ABCB19, SERK1, HSP81-3, ACS9, SEP3, AUX1 and YUC6. The results provide a foundation for the study of sex differentiation in TK.
- Published
- 2020
11. The effects of cyclic loading on the reconsolidation behaviours of marine sedimentary clays under intermittent drainage conditions
- Author
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Yuanqiang Cai, Jun Wang, Yunguo Du, Lin Guo, Dong Feng, Xiuqin Hu, and Zhu Xiaoxiao
- Subjects
Pore water pressure ,Dynamic loading ,Hardening (metallurgy) ,Soil Science ,Cyclic loading ,Geotechnical engineering ,Sedimentary rock ,Subgrade ,Drainage ,Plasticity ,Geotechnical Engineering and Engineering Geology ,Geology ,Civil and Structural Engineering - Abstract
The reconsolidation settlement of marine sedimentary clay subgrade subjected to cyclic dynamic loading under intermittent drainage conditions needs to be further studied. In this study, a series of triaxial tests was conducted on natural Wenzhou soft clays to investigate the reconsolidation responses induced by staged cyclic loading under intermittent drainage conditions. The dynamic behaviours of the test specimens, such as the evolution of excess pore water pressure, variations in stress-strain hysteresis loops and resilient modulus, and cumulative strain development, are analysed and discussed. The experimental results show that during the intermittent quiescent drainage period, the dissipation of the excess pore pressure generated during the cyclic loading period results in reconsolidation of the test specimen. Hardening occurs throughout the tests, as determined by observing the variations in the hysteresis loops and resilient modulus. Throughout the tests, a higher percentage of the axial plastic strain in the quiescent period to the total axial plastic strain indicates that the reconsolidation deformation of the soft clay subgrade caused by intermittent drainage cannot be ignored. These conclusions have significant value for performing in-depth research on the dynamic behaviours of marine sedimentary clays subjected to cyclic traffic loading and predicting the settlement of roads in engineering practice.
- Published
- 2021
12. Piercing the Veil of Modern Physics: Part 3 and Superconductivity
- Author
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Jian, DING, primary and Xiuqin, HU, additional
- Published
- 2019
- Full Text
- View/download PDF
13. Design, Synthesis, and Evaluation of Ribose-Modified Anilinopyrimidine Derivatives as EGFR Tyrosine Kinase Inhibitors
- Author
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Hua Xie, Yufang Xu, You Yang, Xiuqin Hu, Yi Tong, Linjiang Tong, Shiliang Li, Lili Zhu, Disha Wang, and Xia Wang
- Subjects
0301 basic medicine ,Pyrimidine ,EGFR ,Mutant ,Drug resistance ,lcsh:Chemistry ,03 medical and health sciences ,chemistry.chemical_compound ,T790M ,0302 clinical medicine ,Ribose ,tyrosine kinase inhibitors ,carbohydrate-based drugs ,Receptor ,Original Research ,anilinopyrimidine ,glycosides ,General Chemistry ,EGFR Tyrosine Kinase Inhibitors ,respiratory tract diseases ,Chemistry ,030104 developmental biology ,chemistry ,Biochemistry ,Design synthesis ,lcsh:QD1-999 ,030220 oncology & carcinogenesis - Abstract
The synthesis of a series of ribose-modified anilinopyrimidine derivatives was efficiently achieved by utilizing DBU or tBuOLi-promoted coupling of ribosyl alcohols with 2,4,5-trichloropyrimidine as key step. Preliminary biological evaluation of this type of compounds as new EGFR tyrosine kinase inhibitors for combating EGFR L858R/T790M mutant associated with drug resistance in the treatment of non-small cell lung cancer revealed that 3-N-acryloyl-5-O-anilinopyrimidine ribose derivative 1a possessed potent and specific inhibitory activity against EGFR L858R/T790M over WT EGFR. Based upon molecular docking studies of the binding mode between compound 1a and EGFR, the distance between the Michael receptor and the pyrimidine scaffold is considered as an important factor for the inhibitory potency and future design of selective EGFR tyrosine kinase inhibitors against EGFR L858R/T790M mutants.
- Published
- 2017
14. Surface sediment quality relative to port activities: A contaminant-spectrum assessment
- Author
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Shen Yu, Jun Ma, Xiuqin Hu, Jingbo Gao, Bing Hong, Yongshan Chen, Xiang-Rong Xu, Xiuping Xi, and Yuxin Sun
- Subjects
Pollutant ,Persistent organic pollutant ,Environmental Engineering ,010504 meteorology & atmospheric sciences ,Waste management ,business.industry ,Environmental engineering ,Sediment ,Sampling (statistics) ,010501 environmental sciences ,Contamination ,01 natural sciences ,Pollution ,Port (computer networking) ,Environmental Chemistry ,Environmental science ,Sedimentary rock ,Coal ,business ,Waste Management and Disposal ,0105 earth and related environmental sciences - Abstract
Ports are facing increasing environmental concerns with their importance to the global economy. Numerous studies indicated sediment quality deterioration in ports; however, the deterioration is not discriminated for each port activity. This study investigated a spectrum of contaminants (metals and organic pollutants) in surface sediments at 20 sampling points in Port Ningbo, China, one of the top five world ports by volume. The spectrum of contaminants (metals and organic pollutants) was quantified following marine sediment quality guidelines of China and USA and surface sediment quality was assessed according to thresholds of the two guidelines. Coupling a categorical matrix of port activities with the matrix of sedimentary contaminants revealed that contaminants were highly associated with the port operations. Ship repair posed a severe chemical risk to sediment. Operations of crude oil and coal loadings were two top activities related to organic pollutants in sediments while port operations of ore and container loadings discharged metals. Among the 20 sampling points, Cu, Zn, Pb, and DDT and its metabolites were the priority contaminants influencing sediment quality. Overall, surface sediments in Port Ningbo had relatively low environmental risks but ship repair is an environmental concern that must be addressed. This study provides a practical approach for port activity-related quality assessment of surface sediments in ports that could be applicable in many world sites.
- Published
- 2017
15. Highly selective determination of total mercury(II) sub microgram per liter by β-cyclodextrin polymer solid-phase spectrophotometry using 1,3-di-(4-nitrodiazoamino)-benzene
- Author
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Shuangming Meng, Yong Guo, Xijun Chang, Xiuqin Hu, Fengying Wang, and Yongwen Liu
- Subjects
Detection limit ,medicine.diagnostic_test ,Borax ,Chromogenic ,Analytical chemistry ,chemistry.chemical_element ,Molar absorptivity ,Biochemistry ,Analytical Chemistry ,Mercury (element) ,Absorbance ,chemistry.chemical_compound ,chemistry ,Spectrophotometry ,medicine ,Environmental Chemistry ,Spectroscopy ,Masking agent - Abstract
A highly selective β-cyclodextrin polymer solid-phase spectrophotometric (β-CDPSPS) method is described for the determination of total mercury(II) sub microgram per liter. The methods are based on the chromogenic reaction of mercury(II) with 1,3-di-(4-nitrodiazoamino)-benzene (DNAAB) loaded on β-cyclodextrin polymer (β-CDP). In pH 10.0 borax buffer, Hg(II)-DNAAB complex on β-CDP gives a positive peak at 445 nm and a negative one at 545 nm. The absorbance was measured at two peaks and the net absorbance (As) was calculated between the difference of positive and negative peaks. The apparent molar absorptivity is 1.1 × 107 l mol−1 cm−1 (82-fold of it in solution) for 100 ml sample and the linear range of the determination is 0.062–250 μg l−1. The selectivity for coexistent ions was greatly improved, only silver(I) interfered with the mercury determination and the amount of the others was reduced 25–1000 times compared to previous solution method. The interference caused by silver(I) can be eliminated using tri-n-octylmethylammonium bromide as masking agent. The detection limit and the quantification limit were found to be 0.024 and 0.062 μg l−1, respectively. The relative standard deviation of ten replicate determinations of 5.0 μg mercury(II) in 100 ml sample was of 2.4%. The method was validated by analyzing the water and soil reference materials and successfully applied to the determination of mercury(II) in locally collected water and dust samples.
- Published
- 2005
16. Constructing Coarse-Grained System Dependence Graph Based on Ripple Effect
- Author
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Lin Du, Xiuqin Hu, and Haiyan Jiang
- Subjects
Graph bandwidth ,Theoretical computer science ,Clique-width ,Graph based ,Ripple ,Voltage graph ,Graph (abstract data type) ,Null graph ,Mathematics ,Moral graph - Abstract
As described in this paper, we present a novel ripple effect based approach to construct coarse-grained system dependence graph by analyzing the defects which traditional system dependence graph have. Our approach could perfect object-oriented program semantics and reduce the computation complexity. Based on defining the coarse-grained, system dependence graph is simplified. Analysis of ripple effect is mapped to the dependence graph in order to embody semantic interaction among multiple objects. Finally, object-oriented program semantics are described in detail.
- Published
- 2012
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