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Response of soil respiration to a severe drought in Chinese Eucalyptus plantations

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Journal of Forestry Research 2017年第4期28卷 841-847页

作者： shaojun wang Hong wang Department of Environmental Science and Engineering Southwest Forestry University Co-Innovation Center for Sustainable Forestry in Southern China College of Biology and the Environment Nanjing Forestry University

Extreme droughts can adversely affect the dynamics of soil respiration in tree plantations. We used a severe drought in southwestern China as a case study to estimate the effects of drought on temporal variations in soil respiration in a plantation of Eucalyptus globulus. We documented a clear seasonal pattern in soil respiration with the highest values (100.9 mg C-CO2 m(-2) h(-1)) recorded in June and the lowest values (28.7 mg C-CO2 m(-2) h(-1)) in January. The variation in soil respiration was closely associated with the dynamics of soil water driven by the drought. Soil respiration was nearly twice as great in the wet seasons as in the dry seasons. Soil water content accounted for 83-91% of variation in soil respiration, while a combined soil water and soil temperature model explained 90-99% of the variation in soil respiration. Soil water had pronounced effects on soil respiration at the moisture threshold of 6-10%. Soil water was strongly related to changes in soil parameters (i.e., bulk density, pH, soil organic carbon, and available nitrogen). These strongly influenced seasonal variation in soil respiration. We found that soil respiration was strongly suppressed by severe drought. Drought resulted in a shortage of soil water which reduced formation of soil organic carbon, impacted soil acid-base properties and soil texture, and affected soil nutrient availability.

关键词： Drought Eucalyptus globulus Global change Soil respiration

One-Step Electrochemical Approach to the Synthesis of Graphene/MnO2 Nanowall Hybrids

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Nano Research 2011年第7期4卷 648-657页

作者： Chengzhou Zhu shaojun Guo Youxing Fang Lei Han Erkang wang shaojun Dong State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun130022 China

We have demonstrated a one-step and effective electrochemical method to synthesize graphene/MnO2 nanowall hybrids （GMHs）. Graphene oxide （GO） was electrochemically reduced to graphene （GN）, accompanied by the simultaneous formation of MnO2 with a nanowall morphology via cathodic electrochemical deposition. The morphology and structure of the GMHs were systematically characterized by scanning electron microscope （SEM）, X-ray photoelectron spectroscopy （XPS）, X-ray diffraction （XRD）, and Raman spectroscopy. The resulting GMHs combine the advantages of GN and the nanowall array morphology of MnO2 in providing a conductive network of amorphous nanocomposite, which shows good electrochemical capacitive behavior. This simple approach should find practical applications in the large-scale production of GMHs.

关键词： Graphene manganese dioxide nanocomposites electrochemical reduction

Fully Pipelined Soft Vector Processor as a CPU Accelerator

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Chinese Journal of Electronics 2017年第6期26卷 1198-1205页

作者： PANG Yeyong wang shaojun PENG Yu PENG Xiyuan Department of Automatic Test and Control Harbin Institute of Technology

FPGA based soft vector processing accelerators are used frequently to perform highly parallel data processing tasks. Since they are not able to implement complex control manipulations using software, most FPGA systems now incorporate either a soft processor or hard processor. A FPGA based AXI bus compatible vector accelerator architecture is proposed which utilises fully pipelined and heterogeneous ALU for performance, and microcoding is employed for reusability. The design is tested with several design examples in four different lane *** with Central processing unit(CPU), Digital signal processor(DSP), Altera C2H tool and Open CL SDK implementations, the vector processor improves on execution time and energy consumption by factors of up to 6.6 and 6.4 respectively.

关键词： FPGA Vector processor Microprocessor Accelerator

Urban land-use impacts on composition and spatiotemporal variations in abundance and biomass of earthworm community

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Journal of Forestry Research 2020年第1期31卷 325-331页

作者： Jihang Li Zhe Zhang Hong wang shaojun wang Qibo Chen College of Ecology and Soil&Water Conservation Southwest Forestry UniversityBailongsi 300Kunming 650224People’s Republic of China Co-Innovation Center for Sustainable Forestry in Southern China College of Biology and the EnvironmentNanjing Forestry UniversityLongpan Road 159Nanjing 210037People’s Republic of China

Soil fauna can sensitively respond to alterations in soil environment induced by land-use ***,little is known about the impact of urban land-use changes on earthworm *** this study,three land-use types(i.e.,forest,nursery and abandoned lands)were chosen to identify differences in diversity,abundance and biomass of earthworm community in Kunming *** land-use had a pronounced difference in species composition,evenness and diversity of earthworm *** land had the highest density,biomass and diversity of the earthworm *** abundance was dominated by endogeic species in nursery land(70%)and abandoned land(80%),whereas in the forest land,the earthworm community comprised epigeic,endogeic and anecic *** changes in earthworm density and biomass were also significantly affected by land-use *** density and biomass of earthworms in the forest and nursery lands were highest in September,but highest in the abandoned land in *** influence of soil physicochemical properties on the earthworm density and biomass also varied with land-use *** temperature significantly affected earthworm density and biomass in the three land-use *** pH was positively correlated with earthworm biomass in the forest land,but negatively associated with earthworm density in the abandoned *** organic matter was positively correlated only with density and biomass of earthworms in the nursery and abandoned *** results suggest that the species composition,abundance and biomass of earthworm communities can be determined by the modification of soil properties associated with urban land-use type.

关键词： Biomass Density Earthworm community Soil physicochemical properties Spatiotemporal dynamics

Transition metal-doped heteropoly catalysts for the selective oxidation of methacrolein to methacrylic acid

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Frontiers of Chemical Science and Engineering 2016年第1期10卷 139-146页

作者： Yanxia Zheng Heng Zhang Lei wang Suojiang Zhang shaojun wang School of Light Industry and Chemical Engineering Dalian Polytechnic University Dalian 116034 China Beijing Key Laboratory of Ionic Liquids Clean Process Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China School of Chemistry and Chemical Engineering Qufu Normal University Qufu 273165 China

Heteropoly compounds with the general formula Cs1Mo.5X＋H3-o.5xP1.2MOllVO4o （M = Fe, Co, Ni, Cu or Zn） and CslCuyH3_2yP1.2MO11VO40 （y = 0.1, 0.3 or 0.7） were synthesized and then used as catalysts for the selective oxidation of methacrolein to methacrylic acid. The effects of the transition metals on the structure and activity of the catalysts were investigated. FTIR spectra showed that the transition metal-doped catalysts main- tained the Keggin structure of the undoped catalysts. X-ray diffraction results indicated that before calcination, the catalysts doped with Fe and Cu had cubic secondary structures, while the catalysts doped with Co, Ni or Zn had both triclinic and cubic phases and the Co-doped catalyst had the highest content of the triclinic form. Thermal treatment can decrease the content of the triclinic phase. NH3 temperature-programmed desorption and H2 tem- perature-programmed reduction results showed that the transition metals changed the acid and redox properties of the catalysts. The addition of Fe or Cu had positive effects on the activities of the catalyst which is due to the improvement of the electron transfer between the Fe or Cu and the Mo. The effects of the copper content on structure and catalytic activity were also investigated. The CSlCUo.3H2P1.2MO11VO40 catalyst had the best performance for the selective oxidation of methacrolein to methacrylic acid.

关键词： heteropoly compounds transition metals selective oxidation methacrolein

End-to-end aspect category sentiment analysis based on type graph convolutional networks

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High Technology Letters 2023年第3期29卷 325-334页

作者：邵清 ZHANG Wenshuang wang shaojun School of Optoelectronic Information and Intelligent Engineering University of Shanghai for Science and TechnologyShanghai 200093P.R.China

For the existing aspect category sentiment analysis research,most of the aspects are given for sentiment extraction,and this pipeline method is prone to error accumulation,and the use of graph convolutional neural network for aspect category sentiment analysis does not fully utilize the dependency type information between words,so it cannot enhance feature *** paper proposes an end-to-end aspect category sentiment analysis(ETESA)model based on type graph convolutional *** model uses the bidirectional encoder representation from transformers(BERT)pretraining model to obtain aspect categories and word vectors containing contextual dynamic semantic information,which can solve the problem of polysemy;when using graph convolutional network(GCN)for feature extraction,the fusion operation of word vectors and initialization tensor of dependency types can obtain the importance values of different dependency types and enhance the text feature representation;by transforming aspect category and sentiment pair extraction into multiple single-label classification problems,aspect category and sentiment can be extracted simultaneously in an end-to-end way and solve the problem of error *** are tested on three public datasets,and the results show that the ETESA model can achieve higher Precision,Recall and F1 value,proving the effectiveness of the model.

关键词： aspect-based sentiment analysis(ABSA) bidirectional encoder representation from transformers(BERT) type graph convolutional network(TGCN) aspect category and senti-ment pair extraction

Activation of hypothalamic gono-like neurons in female rats during estrus

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Neural Regeneration Research 2012年第31期7卷 2413-2423页

作者： Xiaoxuan Ren shaojun wang Peijing Rong Bing Zhu Institute of Acupuncture and Moxibusfion China Academy of Chinese Medical Sciences Beijing 100700 China School of Acupuncture-Moxibustion and Tuina Beijing University of Chinese Medicine Beijing 100029 China

In mammals, gonadal function is controlled by the activity of hypothalamic gonadotropin-releasing hormone neurons, which control the secretion of adenohypophyseal and gonadal hormones. However, there are a number of unanswered questions in relation to gonadal function. It is currently unknown how erotogenic stimulation of the genitals influences the subpopulation of hypothalamic medial preoptic area neurons, antidromically identified as projecting to the median eminence at different periods of the estrous cycle. Additionally, the distinctiveness of hypothalamic medial preoptic area neurons, with respect to methods of feedback control by exogenous hormones, is also unknown. In this study, spontaneous discharges from individual neurons encountered within the medial preoptic area, gono-like neurons, were recorded extracellularly using glass microelectrodes. To confirm the cellular and histochemical properties of the recording units, antidromic stimulation was performed using a side-by-side bipolar stimulating electrode placed into the median eminence, alongside microiontophoretic injections of the conventional tracer, horseradish peroxidase. In addition, further immunohistochemical analyses were performed. Results showed that elevated gono-neuron activity was accompanied by increased background activity and greater responses to erotogenic stimuli during estrus. Application of clitoral traction stimulation resulted in increased activation of the gono-like neurons. This neuronal activity was noticeably inhibited by β-estradiol administration. Immunohistochemical analyses revealed the presence of gonadotropin-releasing hormone-reactive protein in hypothalamic cells in which electrophysiological recordings were taken. Thus, medial preoptic area neurons represent the subset of hypothalamic gonadotropin-releasing hormone neurons described from brain slices in vitro, and might serve as a useful physiological model to form the basis of future in vivo studies.

关键词： medial preoptic area gonadotropin-releasing hormone erotogenic stimuli estrous cycle neuronal discharge feedback control neural regeneration

Longitudinal single-cell RNA-seq of hESCs-derived retinal organoids

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Science China(Life Sciences) 2021年第10期64卷 1661-1676页

作者： shaojun wang Sergio Poli Xiaoliang Liang Guang-Hua Peng Laboratory of Visual Cell Differentiation and Regulation Basic Medical CollegeZhengzhou UniversityZhengzhou 450001China Department of Ophthalmology First medical center of Chinese PLA General HospitalBeijing 100853China Department of Ophthalmology Fifth medical center of Chinese PLA General HospitalBeijing 100071China Division of Pulmonary and Critical Care Medicine Brigham and Women’s HospitalHarvard Medical SchoolBoston 02115USA Department of Pathophysiology Basic Medical CollegeZhengzhou UniversityZhengzhou 450001China Division of Internal Medicine Mount Sinai Medical CenterMiamiFlorida 33140USA

Human retina development involves multiple well-studied signaling pathways that promote the genesis of a wide arrange of different cell types in a complex architectural *** embryonic stem cells(hESCs)-derived retinal organoids could recapitulate the human retinal *** performed single-cell RNA-seq of retinal organoids from 5 time points(D36,D66,D96,D126,D186)and identified 9 distinct populations of *** addition,we analyzed the molecular characteristics of each main population and followed them from genesis to maturity by pseudotime analysis and characterized the cell-cell interactions between different cell ***,we identified insulin receptor(INSR)as a specifically expressed receptor involved in the genesis of photoreceptors,and pleiothropin(PTN)-protein tyrosine phosphatase receptor type Z1(PTPRZ1)as a mediator of a previously unknown interaction between Müller and retinal progenitor *** together,these findings provide a rich transcriptome-based lineage map for studying human retinal development and modeling developmental disorders in retinal organoids.

关键词： human embryonic stem cell photoreceptor cell single cell RNA sequencing retinal pigment epithelium retinal organoid

Single-cell RNA sequencing analysis of the retina under acute high intraocular pressure

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Neural Regeneration Research 2024年第11期19卷 2522-2531页

作者： shaojun wang Siti Tong Xin Jin Na Li Pingxiu Dang Yang Sui Ying Liu Dajiang wang Division of Ophthalmology The Third Medical Center of PLA General HospitalBeijingChina Department of Ophthalmology Beijing Rehabilitation HospitalCapital Medical UniversityBeijingChina

High intraocular pressure causes retinal ganglion cell injury in primary and secondary glaucoma diseases,yet the molecular landscape characteristics of retinal cells under high intraocular pressure remain *** models of acute hypertension ocular pressure were established by injection of cross-linked hyaluronic acid hydrogel(Healaflow■).Single-cell RNA sequencing was then used to describe the cellular composition and molecular profile of the retina following high intraocular *** results identified a total of 12 cell types,namely retinal pigment epithelial cells,rod-photoreceptor cells,bipolar cells,Müller cells,microglia,cone-photoreceptor cells,retinal ganglion cells,endothelial cells,retinal progenitor cells,oligodendrocytes,pericytes,and *** single-cell RNA sequencing analysis of the retina under acute high intraocular pressure revealed obvious changes in the proportions of various retinal cells,with ganglion cells decreased by 23%.Hematoxylin and eosin staining and TUNEL staining confirmed the damage to retinal ganglion cells under high intraocular *** extracted data from retinal ganglion cells and analyzed the retinal ganglion cell cluster with the most distinct *** found upregulation of the B3gat2 gene,which is associated with neuronal migration and adhesion,and downregulation of the Tsc22d gene,which participates in inhibition of *** study is the first to reveal molecular changes and intercellular interactions in the retina under high intraocular *** data contribute to understanding of the molecular mechanism of retinal injury induced by high intraocular pressure and will benefit the development of novel therapies.

关键词： apoptosis axon degeneration high intraocular pressure microglia ocular hypertension photoreceptor cells retina retinal degeneration retinal ganglion cells single-cell RNA sequencing