854 results on '"Xuan Ma"'
Search Results
252. Primary Care Physicians' and Patients' Perspectives on Equity and Health Security of Infectious Disease Digital Surveillance.
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Chi Wai Wong, William, Ivy Yan Zhao, Ye Xuan Ma, Wei Nan Dong, Jia Liu, Qin Pang, Xiao Qin Lu, Molassiotis, Alex, and Holroyd, Eleanor
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PATIENTS' attitudes ,ELECTRONIC surveillance ,HEALTH equity ,COMMUNICABLE diseases ,PHYSICIANS - Abstract
PURPOSE The coronavirus disease 2019 (COVID-19) pandemic facilitated the rapid development of digital detection surveillance (DDS) for outbreaks. This qualitative study examined how DDS for infectious diseases (ID) was perceived and experienced by primary care physicians and patients in order to highlight ethical considerations for promoting patients' autonomy and health care rights. METHODS In-depth interviews were conducted with a purposefully selected group of 16 primary care physicians and 24 of their patients. The group was reflective of a range of ages, educational attainment, and clinical experiences from urban areas in northern and southern China. Interviews were audio recorded, transcribed, and translated. Two researchers coded data and organized it into themes. A third researcher reviewed 15% of the data and discussed findings with the other researchers to assure accuracy. RESULTS Five themes were identified: ambiguity around the need for informed consent with usage of DDS; importance of autonomous decision making; potential for discrimination against vulnerable users of DDS for ID; risk of social inequity and disparate care outcomes; and authoritarian institutions' responsibility for maintaining health data security. The adoption of DDS meant some patients would be reluctant to go to the hospital for fear of either being discriminated against or forced into quarantine. Certain groups (older people and children) were thought to be vulnerable to DDS misappropriation. CONCLUSIONS These findings indicate the paramount importance of establishing national and international ethical frameworks for DDS implementation. Frameworks should guide all aspects of ID surveillance, addressing privacy protection and health security, and underscored by principles of social equity and accountability. [ABSTRACT FROM AUTHOR]
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- 2023
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253. Hsx, V stability of the Boltzmann equation and Landau equation with soft potentials.
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Xuan Ma and Shuangqian Liu
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- 2010
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254. Mggc2.0: A Preprocessing Code for the Multi-Group Cross Section of the Fast Reactor
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Hu, Kui, primary, Xubo, Ma, additional, Teng, Zhang, additional, Xuan, Ma, additional, Zifeng, Huang, additional, and Yixue, Chen, additional
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- 2022
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255. Prediction of the subcellular location of apoptosis proteins based on approximate entropy.
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Chaohong Song Feng Shi and Xuan Ma
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- 2009
256. Avitograptus species (Graptolithina) from the Hirnantian (uppermost Ordovician) Anji Biota of South China and the evolution of Akidograptus and Parakidograptus
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Xuan Ma, Joseph P. Botting, Yuandong Zhang, and Lucy A. Muir
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010506 paleontology ,South china ,biology ,Climacograptus ,Avitus ,Paleontology ,Biota ,Biozone ,Biostratigraphy ,010502 geochemistry & geophysics ,biology.organism_classification ,01 natural sciences ,Ordovician ,Graptolithina ,Geology ,0105 earth and related environmental sciences - Abstract
The latest Ordovician to earliest Silurian graptolite Avitograptus avitus is important in the biostratigraphy of the Ordovician–Silurian boundary interval. Two additional species of Avitograptus are described from the sponge-dominated Anji Biota of the Upper Ordovician Wenchang Formation (Metabolograptus persculptus Biozone) of Zhejiang Province, South China. One species, Avitograptus akidomorphus new species, is new; the other, Avitograptus acanthocystus new combination, which was previously placed in Climacograptus, is herein assigned to Avitograptus. The former species may represent the ancestral akidograptid because it is identical in thecal form to Akidograptus, but differs in the development of the proximal end. The evolutionary changes from Avitograptus avitus to Akidograptus and Parakidograptus involved distal movement of the origins of th11 and th12, thecal elongation, and greater outward inclination of the thecal walls.UUID: http://zoobank.org/81c433a0-9069-48d2-ae72-1267400cbf77.
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- 2020
257. Silurian conodont biostratigraphy of the Laojianshan section, Baoshan, Yunnan Province, SW China
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Zhongyang Chen, Xiang Fang, Yuandong Zhang, Chengyuan Wang, Xuan Ma, Peep Männik, and Tingen Chen
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Paleontology ,Ireviken event ,biology ,Section (archaeology) ,Geology ,Biostratigraphy ,Conodont ,biology.organism_classification ,Sw china - Published
- 2020
258. The relativistic Vlasov–Maxwell–Fokker–Planck system in the whole space
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Shuangqian Liu and Xuan Ma
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Applied Mathematics ,General Physics and Astronomy ,Statistical and Nonlinear Physics ,Fokker–Planck equation ,Space (mathematics) ,Mathematical Physics ,Mathematics ,Mathematical physics - Published
- 2020
259. Mixed thermal elastohydrodynamic lubrication analysis with dynamic performance of aero ball bearing during start-up and shut-down
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Xuan Ma, Xiqun Lu, Xiujiang Shi, Bin Zhao, and Jiqiang Wu
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Materials science ,Mechanical Engineering ,02 engineering and technology ,Surfaces and Interfaces ,Mechanics ,021001 nanoscience & nanotechnology ,Start up ,Surfaces, Coatings and Films ,020303 mechanical engineering & transports ,0203 mechanical engineering ,Thermal ,Lubrication ,Ball (bearing) ,0210 nano-technology ,Shut down - Abstract
In this study, a coupling model is developed to include the aero ball bearing dynamic performance in the mixed thermal elastohydrodynamic lubrication analysis, and the low-speed and heavy-load conditions during start-up and shut-down are involved. Based on the bearing quasi-dynamics, the inside motion state of the main loading surface is obtained, and the mixed thermal elastohydrodynamic lubrication is conducted to get bearing lubrication state and properties. The numerical lubrication model under low-speed and heavy-load conditions is validated against published tested data, which reveal well consistency in central film thickness. The lubrication properties between a single ball and inner race during start-up have been studied, which indicate the lubrication film transforms from boundary lubrication to unsafe mixed thermal elastohydrodynamic lubrication, and then goes into safe lubrication. The lubrication properties of the balls at different azimuths have been investigated during shut-down and compared with those in start-up, which have a similar opposite changing trend, but not a simple invertible process. The time in boundary lubrication region during shut-down is shorter, and the ball number in boundary lubrication region gets less, which means the lubrication properties are relatively better. At last, the parametric study on mixed thermal elastohydrodynamic lubrication properties during shut-down has been carried out. It is found that the small bearing curve coefficient and increasing ball number can reduce the boundary lubrication time and improve the bearing lubrication.
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- 2020
260. An investigation of changes in water quality throughout the drinking water production/distribution chain using toxicological and fluorescence analyses
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Xuan Ma, Jun-Ling Liu, Ai-Lin Liu, Xue Han, Zhen-Yu He, Xin Ji, Wei Chang, and Fei Tang
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Pollutant ,021110 strategic, defence & security studies ,Environmental Engineering ,Drinking Water ,0211 other engineering and technologies ,02 engineering and technology ,General Medicine ,010501 environmental sciences ,Contamination ,01 natural sciences ,Water Purification ,Distribution chain ,Tap water ,Water Quality ,Environmental chemistry ,Toxicity ,Environmental Chemistry ,Bioassay ,Environmental science ,Water treatment ,Water quality ,Water Pollutants, Chemical ,Environmental Monitoring ,0105 earth and related environmental sciences ,General Environmental Science - Abstract
Changes in water quality from source water to finished water and tap water at two conventional drinking water treatment plants (DWTPs) were monitored. Beside the routine water quality testing, Caenorhabditis elegans-based toxicity assays and the fluorescence excitation-emission matrices technique were also applied. Both DWTPs supplied drinking water that met government standards. Under current test conditions, both the investigated finished water and tap water samples exhibited stronger lethal, genotoxic and reprotoxic potential than the relative source water sample, and the tap water sample was more lethal but tended to be less genotoxic than the corresponding finished water sample. Meanwhile, the nearly complete removal of tryptophan-like substances and newly generated tyrosine-like substances were observed after the treatment of drinking water, and humic-like substances were identified in the tap water. Based on these findings, toxic pollutants, including genotoxic/reproductive toxicants, are produced in the drinking water treatment and/or distribution processes. Moreover, further studies are needed to clarify the potentially important roles of tyrosine-like and humic-like substances in mediating drinking water toxicity and to identify the potential sources of these contaminants. Additionally, tryptophan-like fluorescence may be adopted as a useful parameter to monitor the treatment performance of DWTPs. Our observations provided insights into the importance of utilizing biotoxicity assays and fluorescence spectroscopy as tools to complement the routine evaluation of drinking water.
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- 2020
261. Rectified Softmax Loss With All-Sided Cost Sensitivity for Age Estimation
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Yaqiong Ren, Shyh Wei Teng, Da-Xiang Li, and Xuan Ma
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General Computer Science ,Computer science ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,Convolutional neural network ,Image (mathematics) ,0202 electrical engineering, electronic engineering, information engineering ,General Materials Science ,Sensitivity (control systems) ,0105 earth and related environmental sciences ,business.industry ,General Engineering ,Pattern recognition ,Function (mathematics) ,Backpropagation ,cost sensitivity ,Error function ,softmax loss ,Face (geometry) ,Softmax function ,Age estimation ,020201 artificial intelligence & image processing ,Artificial intelligence ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,business ,lcsh:TK1-9971 - Abstract
In Convolutional Neural Network (ConvNet) based age estimation algorithms, softmax loss is usually chosen as the loss function directly, and the problems of Cost Sensitivity (CS), such as class imbalance and misclassification cost difference between different classes, are not considered. Focus on these problems, this paper constructs a rectified softmax loss function with all-sided CS, and proposes a novel cost-sensitive ConvNet based age estimation algorithm. Firstly, a loss function is established for each age category to solve the imbalance of the number of training samples. Then, a cost matrix is defined to reflect the cost difference caused by misclassification between different classes, thus constructing a new cost-sensitive error function. Finally, the above methods are merged to construct a rectified softmax loss function for ConvNet model, and a corresponding Back Propagation (BP) training scheme is designed to enable ConvNet network to learn robust face representation for age estimation during the training phase. Simultaneously, the rectified softmax loss is theoretically proved that it satisfies the general conditions of the loss function used for classification. The effectiveness of the proposed method is verified by experiments on face image datasets of different races.
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- 2020
262. Using Observed Signals from the Arctic Stratosphere and Indian Ocean to Predict April–May Precipitation in Central China
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Fei Xie, Cheng Sun, Xuan Ma, Jianping Li, Chengqing Ruan, and Wenshou Tian
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Atmospheric Science ,010504 meteorology & atmospheric sciences ,Central china ,010502 geochemistry & geophysics ,01 natural sciences ,The arctic ,Atmosphere ,Indian ocean ,Climatology ,Linear regression ,Environmental science ,Precipitation ,Stratosphere ,0105 earth and related environmental sciences - Abstract
A linear regression model is constructed to predict the April–May precipitation in central China (PCC) with a lead time of 1–2 months. This model not only reproduces the historical April–May PCC from 1985 to 2006 but also demonstrates strong robustness and reliability during the independent test period of 2007–16. Two preceding factors are selected to build the model, the February–March Arctic stratospheric ozone (ASO) and Indian Ocean sea surface temperature (IOSST), indicating a synergistic impact of Arctic and tropical signals on the midlatitude climate. A possible mechanism of ASO changes affecting Chinese precipitation is that the stratospheric circulation anomalies related to ASO changes may downward influence circulation over North Pacific, and then extend westward to influence East Asia, leading to changes in Chinese precipitation. Anomalies of the other predictor, IOSST, are associated with a baroclinic structure over central China. For example, warm IOSST causes anomalous convection over central China and affects the warm and humid airstream flowing from the Pacific to China. These processes related to the two predictors result in the April–May PCC anomalies. Sensitivity experiments and a transient experiment covering a longer period than the observations/reanalysis support the results from our statistical analysis based on observations. It implies that this statistical model could be applied to the output of seasonal forecasts from observations and improve the forecasting ability of April–May PCC in the future.
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- 2020
263. Design of ultra-compact optical detection system with large field of view
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Xu-yang Li, Nan-qing Chu, Zhi-guang Ren, and Zi-xuan Ma
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Physics ,Large field of view ,Optics ,business.industry ,business ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials - Published
- 2020
264. Asymptotic smoothing effect of solutions of two-dimensional micropolar fluid flows.
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Junbai Ren and Xuan Ma
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- 2008
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265. Study on outdoor thermal comfort of the commercial pedestrian block in hot-summer and cold-winter region of southern China-a case study of The Taizhou Old Block
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Hiroatsu Fukuda, Dian Zhou, Mengying Wang, and Xuan Ma
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Meteorology ,Strategy and Management ,05 social sciences ,Thermal comfort ,Transportation ,Pedestrian ,Development ,Thermal sensation ,Cooling time ,Southern china ,Tourism, Leisure and Hospitality Management ,Simulated data ,0502 economics and business ,Cold winter ,Environmental science ,050211 marketing ,050212 sport, leisure & tourism ,Block (data storage) - Abstract
The pedestrian block, famous for its entertainment and commercial vitality, plays an important role in our daily life. The use of this space is determined by the outdoor thermal comfort which can directly affect human's thermal sensation and commercial value. A field questionnaire survey is carried out simultaneously with collecting the microclimatic data in this area. The thermal acceptability and the thermal comfort sensation votes are assessed based on the PET, in addition, a three-dimensional microclimatic modelling tool Envi-met 4.0 is used to evaluate the outdoor thermal comfort and validate the accuracy of the software through comparing the measured data with the simulated data. After putting forward some suggestion for redesigning this area, the result shows that there is as strong improvement in broadening the cooling time, early morning (8:00 a.m. to 11:00 a.m.) and after 18:00 p.m. are the most comfortable time for visiting.
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- 2019
266. Intervention Mechanism of Hunag-Lian Jie-Du Decoction on Canonical Wnt
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Xuesong, Yang, Guangyun, Luo, Lan, Fu, Hong, Huang, Lifen, Wang, Lihua, Yin, Xuelian, Zhang, Tingting, Wang, Xuan, Ma, Tianyu, Feng, and Jianzhou, Ye
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Psoriasis is a common chronic inflammatory skin disease with multifactor etiology, characterized by abnormal proliferation and differentiation of keratinocytes. Huang-Lian Jie-Du decoction (HLJDD) is a traditional Chinese medicine prescription with good clinical curative effect on psoriasis. However, its therapeutic mechanisms are still unclear.The psoriasis model of SKH-1 nude mice was established by imiquimod-induced and HLJDD gavage was given. Hematoxylin and eosin staining were used to evaluate pathological morphologies, and immunohistochemistry was used to detect the expressions of Wnt1,In this study, HLJDD reduced skin erythema and lesions, decreased the thickness of epidermal and downregulated the expressions of Wnt1,HLJDD can effectively treat psoriasis and inhibit the Wnt/
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- 2021
267. Glufosinate-Ammonium Induced Aberrant Histone Modifications in Mouse Sperm Are Concordant With Transcriptome in Preimplantation Embryos
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Xuan Ma, Yun Fan, Wenwen Xiao, Xingwang Ding, Weiyue Hu, and Yankai Xia
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glufosinate-ammonium ,Physiology ,Physiology (medical) ,QP1-981 ,embryo development ,H3K4me3 ,H3K27ac ,sperm - Abstract
Glufosinate-ammonium (GLA) is a widely used herbicide with emerging concern over its male reproductive toxicity. Abnormalities in sperm histone modification induced by GLA exposure observed in our previous study aroused our interest in whether such alterations could further affect embryonic gene expression. Here we administered adult male mice with 0.2 mg/kg⋅day of GLA for 5 weeks to collect their sperm or 4-cell embryos after copulation. Cleavage Under Targets and Tagmentation (CUT&Tag) sequencing showed alterations of sperm H3 lysine 4 trimethylation (H3K4me3) and histone H3 lysine 27 acetylation (H3K27ac), which are active histone modification marks involved in embryo development, while RNA sequencing identified differentially expressed genes in 4-cell embryos. Differentially H3K4me3 and H3K27ac occupied regions were mainly distributed at the gene promoters and putative enhancers, and were enriched in pathways related to the immune system and nervous system. Integrative analysis of these sequencing data showed that genes such as Mgl2 with increased H3K4me3 and H3K27ac in sperm were up-regulated in embryos, and vice versa for genes such as Dcn. Additionally, differentially occupied H3K4me3 and H3K27ac in sperm were linked to gene expression changes in both paternal and maternal alleles of 4-cell embryos. In conclusion, GLA-induced changes in sperm H3K4me3 and H3K27ac are concordant with gene expression in preimplantation embryos, which might further affect embryo development and offspring health.
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- 2021
268. Ordovician to Silurian graptolite specimen images for global correlation and shale gas exploration
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Ning Yang, Zhi-Bin Niu, Xiao-Yan Dong, Yan-Yan Zhu, Yan-Sen Chen, Hong-He Xu, Xuan Ma, Xiao-Jing Tong, Shuang-Shuang Song, Yi-Tong Sun, Qing Xia, and Dan-Ni Fan
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Paleontology ,Stratigraphy ,Shale gas ,Visual examination ,Ordovician ,Nonlinear dimension reduction ,Geology - Abstract
Multi- elemental and -dimensional data are more and more important during the development of data-driven research, as is the case in modern palaeontology, in which visual examination, by experts or someday the artificial intelligence, to every fossil specimen acts a crucial and fundamental role. We here release an integrated image dataset of 113 Ordovician to Silurian graptolite species or subspecies that are significant in global stratigraphy and shale gas exploration. The dataset contains 1550 high-resolution graptolite specimen images and scientific information related to the specimen, e.g., every specimen's taxonomic, geologic, geographic, and related references. We develop a tool, FSIDvis (Fossil Specimen Image Dataset Visualiser), to facilitate the human-interactive exploration of the rich-attribution image dataset. A nonlinear dimension reduction technique, t-SNE (t-Distributed Stochastic Neighbor Embedding), is employed to project the images into the two-dimensional space to visualise and explore the similarities. Our dataset potentially contributes to the analysis of the global biostratigraphic correlations and improves the shale gas exploration efficiency by developing an image-based automated classification model. All images are available from https://doi.org/10.5281/zenodo.5205216 (Xu, 2021).
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- 2021
269. Right-Hand Side Expanding Algorithm for Maximal Frequent Itemset Mining
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Xuan Ma, Hisakazu Ogura, Wei Yu, Yalong Zhang, and Qiuqin Zhu
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Technology ,Association rule learning ,QH301-705.5 ,Computer science ,QC1-999 ,Big data ,frequent itemset mining ,Operator (computer programming) ,association rule ,big data ,Redundancy (engineering) ,General Materials Science ,Point (geometry) ,Biology (General) ,QD1-999 ,Instrumentation ,maximal frequent itemsets ,Fluid Flow and Transfer Processes ,Degree (graph theory) ,business.industry ,Physics ,Process Chemistry and Technology ,General Engineering ,InformationSystems_DATABASEMANAGEMENT ,Engineering (General). Civil engineering (General) ,Computer Science Applications ,Chemistry ,Path (graph theory) ,TA1-2040 ,business ,Database transaction ,Algorithm - Abstract
When it comes to association rule mining, all frequent itemsets are first found, and then the confidence level of association rules is calculated through the support degree of frequent itemsets. As all non-empty subsets in frequent itemsets are still frequent itemsets, all frequent itemsets can be acquired only by finding all maximal frequent itemsets (MFIs), whose supersets are not frequent itemsets. In this study, an algorithm, named right-hand side expanding (RHSE), which can accurately find all MFIs, was proposed. First, an Expanding Operation was designed, which, starting from any given frequent itemset, could add items using certain rules and form some supersets of given frequent itemsets. In addition, these supersets were all MFIs. Next, this operator was used to add items by taking all frequent 1-itemsets as the starting point alternately, and all MFIs were found in the end. Due to the special design of the Expanding Operation, each MFI could be found. Moreover, the path found was unique, which avoided the algorithm redundancy in temporal and spatial complexity. This algorithm, which has a high operating rate, is applicable to the big data of high-dimensional mass transactions as it is capable of avoiding the computing redundancy and finding all MFIs. In the end, a detailed experimental report on 10 open standard transaction sets was given in this study, including the big data calculation results of million-class transactions.
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- 2021
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270. De novo transcriptome analysis provides insights into the salt tolerance of Podocarpus macrophyllus under salinity stress
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Bingbing Li, Shouyu Xue, Xuan Ma, Tao Sun, Lianzhe Wang, Qinggui Wu, Lijuan Zou, Jing He, Taotao Li, and Chunli Liao
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Podocarpus macrophyllus ,biology ,Research ,Gene Expression Profiling ,Salt stress ,De novo transcriptome assembly ,Botany ,Salt-Tolerant Plants ,Plant Science ,Genes, Plant ,biology.organism_classification ,Transcriptome ,Chloroplast ,Cycadopsida ,Biochemistry ,Phytohormone ,Gene Expression Regulation, Plant ,QK1-989 ,MYB ,Transcription factor ,Biological regulation ,Secondary metabolism ,Gene - Abstract
Background Soil salinization is causing ecosystem degradation and crop yield reduction worldwide, and elucidation of the mechanism of salt-tolerant plants to improve crop yield is highly significant. Podocarpus macrophyllus is an ancient gymnosperm species with a unique environmental adaptation strategy that may be attributed to its lengthy evolutionary process. The present study investigated the physiological and molecular responses of P. macrophyllus plants to salt stress by analyzing its photosynthetic system and antioxidant enzyme activity. We also analyzed the differentially expressed genes (DEGs) in P. macrophyllus under salt stress using RNA sequencing and de novo transcriptome assembly. Results Salt treatment significantly affected the photosynthetic system in P. macrophyllus seedlings, which decreased chlorophyll content, altered chloroplast ultrastructure, and reduced photosynthesis. The activities of antioxidant enzymes increased significantly following salt stress treatment. Transcriptome analysis showed that salt stress induced a large number of genes involved in multiple metabolic and biological regulation processes. The transcription levels of genes that mediate phytohormone transport or signaling were altered. K+ and Ca2+ transporter-encoding genes and the MYB transcription factor were upregulated under salt stress. However, the genes involved in cell wall biosynthesis and secondary metabolism were downregulated. Conclusion Our research identified some important pathways and putative genes involved in salt tolerance in P. macrophyllus and provided clues for elucidating the mechanism of salt tolerance and the utilization of the salt tolerance genes of P. macrophyllus for crop improvement.
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- 2021
271. Talaromynoids A-I, Highly Oxygenated Meroterpenoids from the Marine-Derived Fungus
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Zhong-Hui, Huang, Xiao, Liang, Chan-Juan, Li, Qiong, Gu, Xuan, Ma, and Shu-Hua, Qi
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Oxygen ,Aquatic Organisms ,China ,Mice ,Molecular Structure ,Talaromyces ,Terpenes ,3T3-L1 Cells ,Animals ,Humans ,cdc25 Phosphatases ,Lipid Metabolism ,Triglycerides - Abstract
Nine new highly oxygenated 3,5-dimethylorsellinic acid-derived meroterpenoids, talaromynoids A-I (
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- 2021
272. Ultrasonic assistant synthesis, structure and magnetic property of a 3D supermolecular framework based on 2-isobutyl-1H-imidazoledicarboxylate and copper(II) ions
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Yong-Bo Tan, Xue-Min Jing, Hui-Jie Lu, Yu-Xuan Ma, and Xing-Yao Cui
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Inorganic Chemistry ,Materials Chemistry ,Physical and Theoretical Chemistry - Published
- 2022
273. Late Carboniferous closure of the Junggar-Balkhash Ocean: Insights from the early Permian post-accretionary magmatism in the Barleik Mountains of West Junggar, NW China
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Yang-Bai-He Hong, Bo Liu, Bao-Fu Han, Jing-Xuan Ma, and Jun-Dian Chen
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Geochemistry and Petrology ,Geology - Published
- 2022
274. A genetic algorithm for the optimization of cable routing.
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Xuan Ma, Kazuhiro Iida, Mengchun Xie, Junji Nishino, Tomohiro Odaka, and Hisakazu Ogura
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- 2006
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275. Recognition Algorithm for Small Packages of Traditional Chinese Medicine Based on Improved YOLOV4
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Shiqi, Liu, primary, Jia, Guo, additional, Jianyu, Wang, additional, and Xuan, Ma, additional
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- 2021
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276. Analysis of Optical Long-period Light Variation and Study of Color Index Variation in FSRQ 0208-512
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Lin, LU, primary, Hao-jing, ZHANG, additional, Guo-wei, REN, additional, Huan, ZHANG, additional, Pei-lin, YAN, additional, and Kai-xuan, MA, additional
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- 2021
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277. Glucose Limitation Sensitizes Cancer Cells to Selenite-Induced Cytotoxic Effect via SLC7A11-Mediated Redox Collapse
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Hui Chen, Jinling Cui, Han Zhang, Cao Lixing, Xuan Ma, Yin Shutao, Chong Zhao, and Hu Hongbo
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biology ,Chemistry ,Cancer cell ,Cancer research ,medicine ,biology.protein ,Cytotoxic T cell ,chemistry.chemical_element ,medicine.symptom ,SLC7A11 ,Redox ,Collapse (medical) ,Selenium - Abstract
Background: Combination of fasting with chemotherapy has been drawn an increasing attention because of the encouraging efficacy. SLC7A11 is frequently over-expressed in most of cancer cells, and elevated expression of SLC7A11 renders cancer cells more susceptible to glucose starvation owing to SLC7A11-mediated redox collapse. Selenite is a representative inorganic form of selenium, and is preferentially accumulated in tumors. This selenophilic peculiarity of cancer cells is closely associated with the elevated expression of SLC7A11. Given the established the link among glucose deprivation, SLC7A11, oxidative stress and selenite, we hypothesized that glucose starvation could specifically sensitize cancer cells to selenite-mediated cytotoxic effect. Methods: The cytotoxic effect of combining selenite with glucose starvation on cancer cell was assessed by crystal violet staining and Annexin V/PI staining. Flow cytometry were employed to assess intracellular ROS levels, labile iron pool and lipid peroxidation. Xenograft models were used to test its in vivo antitumor activity. Commercial assay kit, LC-MS, RNA interference and western blot were applied to investigate the mechanism underlying synergistic effect.Results: It showed that cytotoxic effect of selenite on cancer cells, but not on normal cells, was significantly enhanced in response to the combination of selenite and glucose limitation. Furthermore, in vivo therapeutic efficacy of combining selenite with fasting was dramatically improved in xenograft models of lung and colon cancer. Mechanistically, we found that SLC7A11 expression in cancer cells was up-regulated by selenite both in vitro and in vivo. The elevated SLC7A11 led to accumulation of cystine, depletion of NADPH, and inhibition of cystine to cysteine conversion, which in turn boosted selenite-mediated reactive oxygen species (ROS), followed by enhancement of selenite-mediated cytotoxic effect. Conclusion: The findings of the present study provide an effective and practical approach for increasing the therapeutic window of selenite, and imply that combination of selenite with fasting holds promising potential to be developed a clinically useful regimen for treating certain types of cancer.
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- 2021
278. Talaromyoxaones A and B: Unusual Oxaphenalenone Spirolactones as Phosphatase Inhibitors from the Marine-Derived Fungus
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Xiao, Liang, Zhong-Hui, Huang, Wen-Bin, Shen, Xin-Hua, Lu, Xue-Xia, Zhang, Xuan, Ma, and Shu-Hua, Qi
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Molecular Docking Simulation ,Talaromyces ,Spironolactone ,Phosphoric Monoester Hydrolases - Abstract
(+)- and (-)-talaromyoxaones A and B (
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- 2021
279. Multi-Objective Optimization for High-Dimensional Maximal Frequent Itemset Mining
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Xuan Ma, Hisakazu Ogura, Yalong Zhang, Dongfen Ye, and Wei Yu
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Technology ,Association rule learning ,Computer science ,QH301-705.5 ,QC1-999 ,Big data ,frequent itemset mining ,High dimensional ,Space (commercial competition) ,computer.software_genre ,Multi-objective optimization ,Set (abstract data type) ,association rules ,big data ,General Materials Science ,Biology (General) ,Instrumentation ,QD1-999 ,Fluid Flow and Transfer Processes ,maximal frequent itemset ,business.industry ,Process Chemistry and Technology ,Physics ,General Engineering ,InformationSystems_DATABASEMANAGEMENT ,Engineering (General). Civil engineering (General) ,Computer Science Applications ,Running time ,Chemistry ,multi-objective optimization ,A priori and a posteriori ,Data mining ,TA1-2040 ,business ,computer - Abstract
The solution space of a frequent itemset generally presents exponential explosive growth because of the high-dimensional attributes of big data. However, the premise of the big data association rule analysis is to mine the frequent itemset in high-dimensional transaction sets. Traditional and classical algorithms such as the Apriori and FP-Growth algorithms, as well as their derivative algorithms, are unacceptable in practical big data analysis in an explosive solution space because of their huge consumption of storage space and running time. A multi-objective optimization algorithm was proposed to mine the frequent itemset of high-dimensional data. First, all frequent 2-itemsets were generated by scanning transaction sets based on which new items were added in as the objects of population evolution. Algorithms aim to search for the maximal frequent itemset to gather more non-void subsets because non-void subsets of frequent itemsets are all properties of frequent itemsets. During the operation of algorithms, lethal gene fragments in individuals were recorded and eliminated so that individuals may resurge. Finally, the set of the Pareto optimal solution of the frequent itemset was gained. All non-void subsets of these solutions were frequent itemsets, and all supersets are non-frequent itemsets. Finally, the practicability and validity of the proposed algorithm in big data were proven by experiments.
- Published
- 2021
280. Overexpressing STAMP2 attenuates diabetic renal injuries via upregulating autophagy in diabetic rats
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Zhan Gao, Yun Ti, Ming Zhong, Wei-xuan Ma, Fang-qiang Song, Bo-ang Hu, Ying Yu, Wei Zhang, Ming Song, and Xu Zhang
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Male ,Transcriptional Activation ,medicine.medical_specialty ,Kidney Cortex ,Genetic Vectors ,Biophysics ,Diet, High-Fat ,Kidney ,Biochemistry ,Streptozocin ,Diabetes Mellitus, Experimental ,Diabetic nephropathy ,Rats, Sprague-Dawley ,Insulin resistance ,Sirtuin 1 ,Internal medicine ,Diabetes mellitus ,medicine ,Autophagy ,Animals ,Autophagy-Related Protein-1 Homolog ,Diabetic Nephropathies ,Molecular Biology ,PI3K/AKT/mTOR pathway ,business.industry ,TOR Serine-Threonine Kinases ,AMPK ,Membrane Proteins ,Cell Biology ,Streptozotocin ,medicine.disease ,Rats ,Up-Regulation ,Endocrinology ,Gene Expression Regulation ,Signal transduction ,business ,Oxidoreductases ,medicine.drug ,Signal Transduction - Abstract
Diabetic nephropathy (DN) is one of the most serious and major renal complications of diabetes. Previously, Six-transmembrane Protein of Prostate 2 (STAMP2) was reported to contribute to nutritional stress. The purpose of this study is to investigate whether overexpression of STAMP2 attenuates diabetic renal injuries in DN rats. We induced the DN rat model by high-fat diet and low-dose streptozotocin and evaluated the metabolite and urine albumin/creatinine. Recombinant adeno-associated virus vectors were injected for overexpression of STAMP2. Pathophysiologic and ultrastructure features of DN by histochemical stain and transmission electron microscope, autophagy-related proteins and signaling pathway by western blotting were assessed. We found the expression of STAMP2 was decreased and autophagy was blunted in DN rat kidneys. Overexpressing STAMP2 significantly ameliorated metabolic disturbance, insulin resistance, and specifically restoring diabetic renal injury. Furthermore, overexpressing STAMP2 improved the autophagy deficiency in DN rats, as revealed by changes in the expressions of Beclin1, p62, and LC3. Furthermore, STAMP2 overexpressing promoted autophagy by inhibiting the mTOR and activating the AMPK/SIRT1 signaling pathway. Our results suggested that STAMP2 overexpression attenuated renal injuries via upregulating autophagy in DN rats. STAMP2 overexpressing promoted autophagy may been involved with inhibition of the mTOR/ULK1 and activation of the AMPK/SIRT1 signaling pathway.
- Published
- 2021
281. SDG712, a Putative H3K9-Specific Methyltransferase Encoding Gene, Delays Flowering through Repressing the Expression of Florigen Genes in Rice
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Xuan Ma, Ying-ying Li, Weiyin Liu, Hongjiao Hao, Shanshan Liang, Weijiang Luan, Siju Zhang, Xiaonan Liu, and Rui Zheng
- Subjects
Soil Science ,Plant Science ,medicine.disease_cause ,SB1-1110 ,Flowering ,chemistry.chemical_compound ,SDG712 ,Gene expression ,medicine ,Gene ,Florigen ,Regulator gene ,Genetics ,Mutation ,biology ,Plant culture ,food and beverages ,Histone ,Histone methyltransferase ,chemistry ,biology.protein ,Original Article ,Rice ,Agronomy and Crop Science ,Chromatin immunoprecipitation - Abstract
SET domain group (SDG) proteins have been identified to be involved in histone modification and participate in diverse biological processes. Rice contains 41 SDG genes, however, most of which have not been functionally characterized. Here, we report the identification and functional investigation of rice SDG712 gene. Phylogenic analysis revealed that SDG712 belongs to the H3K9-specific SDG subclade. SDG712 is highly expressed in leaves during reproductive growth stage with obvious circadian rhythmic pattern. Mutation of SDG712 promotes rice flowering, while overexpression of SDG712 delays rice flowering. Gene expression analysis suggested that SDG712 acts downstream of Hd1, while acts upstream of Ehd1, Hd3a and RFT1. Subcellular localization assay demonstrated that SDG712 is localized in the nucleus. Chromatin immunoprecipitation (ChIP) assay showed that the H3K9me2 levels at Hd3a and RFT1 loci were increased in SDG712 overexpression transgenic plants, indicating that SDG712 may mediate the H3K9 di-methylation on these loci to repress rice flowering. Taken together, our findings demonstrated that SDG712 is a negative flowering regulatory gene in rice, and it delays flowering through repressing key flowering regulator gene Ehd1 and the florigen genes Hd3a and RFT1.
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- 2021
282. CIDEC: A Potential Factor in Diabetic Vascular Inflammation
- Author
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Fang-Qiang Song, Hui-Min Zhou, Wei-Xuan Ma, Yu-Lin Li, Bo-Ang Hu, Yuan-Yuan Shang, Zhi-Hao Wang, Ming Zhong, Wei Zhang, and Yun Ti
- Subjects
Inflammation ,Cell Death ,Physiology ,Animals ,Proteins ,Insulin Resistance ,Cardiology and Cardiovascular Medicine ,Diabetes Mellitus, Experimental ,Rats - Abstract
Cell death-inducing DFF45-like effector C (CIDEC) is involved in diet-induced adipose inflammation. Whether CIDEC plays a role in diabetic vascular inflammation remains unclear. A type 2 diabetic rat model was induced by high-fat diet and low-dose streptozotocin. We evaluated its characteristics by metabolic tests, Western blot analysis of CIDEC and C1q/tumor necrosis factor-related protein-3 (CTRP3) expression, and histopathological analysis of aortic tissues. The diabetic group exhibited elevated CIDEC expression, aortic inflammation, and remodeling. To further investigate the role of CIDEC in the pathogenesis of aortic inflammation, gene silencing was used. With CIDEC gene silencing, CTRP3 expression was restored, accompanied with amelioration of insulin resistance, aortic inflammation, and remodeling in diabetic rats. Thus, the silencing of CIDEC is potent in mediating the reversal of aortic inflammation and remodeling, indicating that CIDEC may be a potential therapeutic target for vascular complications in diabetes.
- Published
- 2021
283. Exponential Synchronization of Switched Cellular Neural Networks via AED-ADT Switching
- Author
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Haibin Sun, Xuan Ma, Linlin Hou, and Hangli Ren
- Subjects
Lyapunov function ,Exponential synchronization ,symbols.namesake ,Dwell time ,Control theory ,Computer science ,Control system ,Cellular neural network ,Synchronization (computer science) ,symbols ,Master/slave - Abstract
This paper analyses the synchronization problem of switched cellular neural networks. The admissible edge-dependent average dwell time method is used to design switching signals. By virtue of the multiple Lyapunov function technology and Newton-Leibniz formula, a sufficient condition is established to guarantee the exponential synchronization of switched cellular neural networks. Finally, a numerical example is employed to verify the effectiveness of proposed methods.
- Published
- 2021
284. Implementation of a Federated Large-Scale Remote Sensing Data Sharing Platform
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Lu Bai, Xuan Ma, Jinhua Tao, Bilong Wen, Juntao Gao, Zhibao Wang, and Bingbing Xu
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Data sharing ,Metadata ,Distributed database ,business.industry ,Computer science ,Data management ,Access method ,Cloud computing ,Loose coupling ,business ,Cloud storage ,Remote sensing - Abstract
In this paper, a unified virtual cloud storage method for federated data based on the middle layer is proposed, which aims at solving the problems of the heterogeneous data sources of remote sensing data in the shared platform among the federated remote sensing data management application under loose coupling mode. A federated remote sensing image data management model is developed based on NASA's Unified Metadata Model (UMM). This platform implements services such as unified access to multi-source heterogeneous image data which effectively solves the problem of heterogeneous data sources in the loosely coupled federated system, and provides better access methods for upper-level applications.
- Published
- 2021
285. Smart and Functionalized Development of Nucleic Acid‐Based Hydrogels: Assembly Strategies, Recent Advances, and Challenges
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Kunlun Huang, Tian Jingjing, Liye Zhu, Wentao Xu, Yangzi Zhang, Longjiao Zhu, Xuan Ma, Xiaoyun He, and Fazheng Ren
- Subjects
Bioanalysis ,Computer science ,General Chemical Engineering ,Science ,General Physics and Astronomy ,Medicine (miscellaneous) ,Reviews ,Nanotechnology ,Biocompatible Materials ,Review ,Biosensing Techniques ,Biochemistry, Genetics and Molecular Biology (miscellaneous) ,functional nucleic acid ,law.invention ,stimuli‐responsive hydrogel ,law ,Biological property ,Nucleic Acids ,General Materials Science ,3D bioprinting ,Tissue Engineering ,General Engineering ,Bioprinting ,technology, industry, and agriculture ,Hydrogels ,nucleic acid‐based hydrogel ,Self-healing hydrogels ,drug delivery ,Nucleic acid ,biosensing - Abstract
Nucleic acid‐based hydrogels that integrate intrinsic biological properties of nucleic acids and mechanical behavior of their advanced assemblies are appealing bioanalysis and biomedical studies for the development of new‐generation smart biomaterials. It is inseparable from development and incorporation of novel structural and functional units. This review highlights different functional units of nucleic acids, polymers, and novel nanomaterials in the order of structures, properties, and functions, and their assembly strategies for the fabrication of nucleic acid‐based hydrogels. Also, recent advances in the design of multifunctional and stimuli‐responsive nucleic acid‐based hydrogels in bioanalysis and biomedical science are discussed, focusing on the applications of customized hydrogels for emerging directions, including 3D cell cultivation and 3D bioprinting. Finally, the key challenge and future perspectives are outlined., Nucleic acid‐based hydrogels present the trend of interdisciplinary development from the diversified construction building blocks to the extensive application fields, mainly including biosensing, drug delivery, 3D cell cultivation, 3D bioprinting, bioimaging, and treatment and analysis of environmental pollutants.
- Published
- 2021
286. The initial boundary value problem for the Vlasov–Poisson–Fokker–Planck system
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Xuan Ma and Fuli He
- Subjects
Statistical and Nonlinear Physics ,Mathematical Physics - Abstract
This paper is devoted to the initial boundary value problem of the Vlasov–Poisson–Fokker–Planck system in a bounded domain. The global existence of a unique strong solution and its exponential convergence rate to the equilibrium state are proved under the specular reflection boundary condition. The proof is based on an elementary energy method and the [Formula: see text] theory developed by Guo et al. [Arch. Ration. Mech. Anal. 236(3), 1389–1454 (2020)] for kinetic models.
- Published
- 2022
287. S-doped M-N-C catalysts for the oxygen reduction reaction: Synthetic strategies, characterization, and mechanism
- Author
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Li-lai Liu, Min-xuan Ma, Hao Xu, Xue-ying Yang, Xiang-yu Lu, Peixia Yang, and Hui Wang
- Subjects
General Chemical Engineering ,Electrochemistry ,Analytical Chemistry - Published
- 2022
288. Optimization study of oil-feed parameters to improve the ring pack lubrication performance for a two-stroke marine diesel engine
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Tongyang Li, Bowen Jiao, Xuan Ma, Xiqun Lu, and Zhuhui Qiao
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General Engineering ,General Materials Science - Published
- 2022
289. Convergence theorems and maximal inequalities for martingale ergodic processes
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Guangzhou, Luo, Xuan, Ma, and Peide, Liu
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- 2010
- Full Text
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290. Dynamic APACHE II Score to Predict Outcome Among Intensive Care Unit Patients
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Xin Diao, Yao Tian, Kaixia Cai, Yang Yao, Xuan Ma, Jing Zhou, Shengyu Wang, and Hui Chen
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medicine.medical_specialty ,Text mining ,business.industry ,law ,Emergency medicine ,Medicine ,Apache II score ,business ,Intensive care unit ,Outcome (game theory) ,law.invention - Abstract
Purpose: The Acute Physiology and Chronic Health Evaluation II (APACHE II) score is used to determine disease severity and predict outcomes in critically ill patients. However, there is no dynamic APACHE II score for predicting outcomes among ICU patients.The aim of this study is to explore the optimal timing to predict the outcomes of ICU patients by dynamically evaluating APACHE II score.Methods: Study data of demographics and comorbidities from the first 24 h after ICU admission were retrospectively extracted from MIMIC-III, a multiparameter intensive care database. The primary outcome was hospital mortality. 90-day mortality was a secondary outcome. APACHE II scores on days 1, 2, 3, 5, 7, 14 and 28 were compared using area under the receiver operating characteristic (AUROC) analysis. Hospital survival was visualised using Kaplan-Meier Curves.Results:A total of 6374 eligible subjects were extracted from the MIMIC-III. Mean APACHE II score on day 1 were 18.4±6.3, hospital and 90-day mortality was 19.1% and 25.8%, respectively.The optimal timing where predicted hospital mortality was on day 3 with an area under the cure of 0.666 (0.607-0.726)(P<0.0001). The best tradeoff for preciction was found at 17 score, more than 17 score predicted mortality of non-survivors with a sensitivity of 92.8% and PPV of 23.1%. Hosmer-lemeshow goodness of fit test showed that APACHE II 3 has a good predictive calibration ability (X2 =6.198, P=0.625) and consistency of predicted death and actual death was 79.4%. The calibration of APACHE II 1 was poor (X2=294.898, PConclusions: APACHE II on 3 dayis the optimal prognostic marker and 17 score provided the best dignostic accuracy to predict outcomes for ICU patients. These finding will help medical make clinical judgment.
- Published
- 2021
291. Mechanisms of Physical Fatigue and its Applications in Nutritional Interventions
- Author
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Cao Lixing, Chong Zhao, Hui Chen, Shutao Yin, Xuan Ma, Hongbo Hu, and Shuang Zhao
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0106 biological sciences ,Functional role ,medicine.medical_specialty ,Nutritional Supplementation ,business.industry ,010401 analytical chemistry ,Energy metabolism ,General Chemistry ,01 natural sciences ,0104 chemical sciences ,Oxidative Stress ,Physical Fatigue ,Multiple factors ,Nutritional Interventions ,Physical performance ,Dietary Supplements ,medicine ,Nutrient supplementation ,Humans ,General Agricultural and Biological Sciences ,Intensive care medicine ,business ,Exercise ,Fatigue ,010606 plant biology & botany - Abstract
Physical fatigue during exercise can be defined as an impairment of physical performance. Multiple factors have been found contributing to physical fatigue, including neurotransmitter-mediated defense action, insufficient energy supply, and induction of oxidative stress. These mechanistic findings provide a sound theoretical rationale for nutritional intervention since most of these factors can be modulated by nutrient supplementation. In this review, we summarize the current evidence regarding the functional role of nutrients supplementation in managing physical performance and propose the issues that need to be addressed for better utilization of nutritional supplementation approach to improve physical performance.
- Published
- 2021
292. Environmental chemical exposure dynamics and machine learning-based prediction of diabetes mellitus
- Author
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Xuan Ma, Weiyue Hu, Wenqi Shan, Yankai Xia, Hongcheng Wei, Jie Sun, Wenwen Xiao, Bingqian Wang, and Xinru Wang
- Subjects
Environmental Engineering ,Diabetes risk ,Machine learning ,computer.software_genre ,Set (abstract data type) ,Machine Learning ,Lasso (statistics) ,Diabetes mellitus ,Diabetes Mellitus ,Environmental Chemistry ,Medicine ,Humans ,Waste Management and Disposal ,Receiver operating characteristic ,business.industry ,Linear model ,Fasting ,medicine.disease ,Nutrition Surveys ,Pollution ,Regression ,Random forest ,ROC Curve ,Artificial intelligence ,business ,computer - Abstract
Background With dramatically increasing prevalence, diabetes mellitus has imposed a tremendous toll on individual well-being. Humans are exposed to various environmental chemicals, which have been postulated as underappreciated but potentially modifiable diabetes risk factors. Objectives To determine the utility of environmental chemical exposure in predicting diabetes mellitus. Methods A total of 8501 eligible participants from NHANES 2005–2016 were randomly assigned to a discovery (N = 5953) set and a validation (N = 2548) set. We applied random forest (RF) and least absolute shrinkage and selection operator (LASSO) regression with 10-fold cross-validation in the discovery set to select features, and built an optimal model to predict diabetes mellitus, blood insulin, fasting plasma glucose (FPG) and 2-h plasma glucose after oral glucose tolerance test (2-h PG after OGTT). Results The machine learning model using LASSO regression predicted diabetes with an area under the receiver operating characteristics (AUROC) of 0.80 and 0.78 in the discovery set and validation set, respectively. The linear model predicted blood insulin level with an R2 of 0.42 and 0.40 in the discovery set and validation set, respectively. For FPG, the discovery set and validation set yielded an R2 of 0.16 and 0.15, respectively. For 2-h PG after OGTT, the discovery set and validation set yielded an R2 of 0.18 and 0.17, respectively. Conclusion We used environmental chemical exposure, constructed machine learning models and achieved relatively accurate prediction for diabetes, emphasizing the predictive value of widespread environmental chemicals for complicated diseases.
- Published
- 2021
293. Effects of glufosinate-ammonium on male reproductive health: Focus on epigenome and transcriptome in mouse sperm
- Author
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Weiyue Hu, Yankai Xia, Zhe Li, Wenqi Shan, Xinru Wang, Bingqian Wang, Xingwang Ding, Ya Wen, and Xuan Ma
- Subjects
Male ,Environmental Engineering ,Health, Toxicology and Mutagenesis ,Biology ,Transcriptome ,Andrology ,Semen quality ,Epigenome ,Mice ,Environmental Chemistry ,Animals ,Epigenetics ,Synapse organization ,Aminobutyrates ,Public Health, Environmental and Occupational Health ,General Medicine ,General Chemistry ,DNA Methylation ,Pollution ,Sperm ,Spermatozoa ,Mice, Inbred C57BL ,Semen Analysis ,Reproductive Health ,DNA methylation ,Genomic imprinting - Abstract
Glufosinate-ammonium (GLA) is a widely used herbicide with emerging concern over its neural and reproductive toxicity. To uncover potential effects of GLA on male reproductive health in mammals, adult male C57BL/6J mice were administered 0.2 mg/kg·d GLA for 5 weeks. After examination on fertility, testis histology and semen quality in the GLA group, we performed deep sequencing to identify repressive epigenetic marks including DNA methylation and histone modifications (H3K27me3 and H3K9me3), together with mRNA transcript levels in sperm. Then, we integrated multi-omics sequencing data to comprehensively explore GLA-induced epigenetic and transcriptomic alterations. We found no significant difference either on fertility, testis histology or semen quality-related indicators. As for epigenome, the protein level of H3K27me3 was significantly increased in GLA sperm. Next generation sequencing showed alterations of these epigenetic marks and extensive transcription inhibition in sperm. These differential repressive marks were mainly distributed at intergenic regions and introns. According to results by Gene Ontology enrichment analysis, both differentially methylated and expressed genes were mainly enriched in pathways related to synapse organization. Subtle differences in genomic imprinting were also observed between the two groups. These results suggested that GLA predominantly impaired sperm epigenome and transcriptome in mice, with little effect on fertility, testis histology or semen quality. Further studies on human sperm using similar strategies need to be conducted for a better understanding of the male reproductive toxicity of GLA.
- Published
- 2021
294. TarDB: an online database for plant miRNA targets and miRNA-triggered phased siRNAs
- Author
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Xiaonan Liu, Xuan Ma, Weijiang Luan, Siju Zhang, Shanshan Liang, and Jing Liu
- Subjects
0106 biological sciences ,Small interfering RNA ,In silico ,Computational biology ,QH426-470 ,Biology ,Proteomics ,01 natural sciences ,Mirna target ,Database ,03 medical and health sciences ,Gene Expression Regulation, Plant ,microRNA ,Genetics ,RNA, Small Interfering ,030304 developmental biology ,0303 health sciences ,miRNA target ,Degradome ,Online database ,Plant ,Plants ,PhasiRNA ,MicroRNAs ,Plant development ,RNA, Plant ,DNA microarray ,TP248.13-248.65 ,010606 plant biology & botany ,Biotechnology - Abstract
Background In plants, microRNAs (miRNAs) are pivotal regulators of plant development and stress responses. Different computational tools and web servers have been developed for plant miRNA target prediction; however, in silico prediction normally contains false positive results. In addition, many plant miRNA target prediction servers lack information for miRNA-triggered phased small interfering RNAs (phasiRNAs). Creating a comprehensive and relatively high-confidence plant miRNA target database is much needed. Results Here, we report TarDB, an online database that collects three categories of relatively high-confidence plant miRNA targets: (i) cross-species conserved miRNA targets; (ii) degradome/PARE (Parallel Analysis of RNA Ends) sequencing supported miRNA targets; (iii) miRNA-triggered phasiRNA loci. TarDB provides a user-friendly interface that enables users to easily search, browse and retrieve miRNA targets and miRNA initiated phasiRNAs in a broad variety of plants. TarDB has a comprehensive collection of reliable plant miRNA targets containing previously unreported miRNA targets and miRNA-triggered phasiRNAs even in the well-studied model species. Most of these novel miRNA targets are relevant to lineage-specific or species-specific miRNAs. TarDB data is freely available at http://www.biosequencing.cn/TarDB. Conclusions In summary, TarDB serves as a useful web resource for exploring relatively high-confidence miRNA targets and miRNA-triggered phasiRNAs in plants.
- Published
- 2021
295. Population Activity in Motor Cortex is Influenced by the Contexts of the Motor Behavior
- Author
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Kevin L. Bodkin, Lee E. Miller, and Xuan Ma
- Subjects
0301 basic medicine ,education.field_of_study ,Proprioception ,Population ,GRASP ,Context (language use) ,Neural engineering ,03 medical and health sciences ,Neural activity ,030104 developmental biology ,0302 clinical medicine ,medicine.anatomical_structure ,medicine ,Primary motor cortex ,education ,030217 neurology & neurosurgery ,Motor cortex ,Cognitive psychology - Abstract
Most sensorimotor studies investigating the covariation of populations of neurons in primary motor cortex (M1) have considered only a few trained movements made under highly constrained conditions. However, motor behaviors in daily living happen in a far more complex and varied contexts. It is unclear whether M1 neurons would have different population responses in a more naturalistic, unconstrained setting, including requirements to accommodate multiple limbs and body posture, and more extensive proprioceptive inputs. Here, we recorded M1 spiking signals while a monkey performed hand grasp movements in two different contexts: one in the typical constrained lab setting, and the other while moving freely in a large plastic cage. We compared the covariance patterns of the neural activity during movements across the two contexts. We found that the neural covariation patterns accompanying two different hand grasps in the unconstrained context were largely preserved, while they differed across contexts, even for the same type of grasp. We also found that the M1 population activity was confined to context-dependent neural manifolds, but these manifolds were not completely independent, as some dimensions appeared to be shared across the contexts. These results suggest that the coordinated activity of M1 neurons is strongly dependent on behavioral context, in ways that were not entirely anticipated.
- Published
- 2021
296. Effect of urban underlying surface on PM2.5 vertical distribution based on UAV in Xi’an, China
- Author
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Yuejing Gao, Kai Xin, Jianxin Zhang, Li Han, Yanyu Liu, Xuan Ma, and Jingyuan Zhao
- Subjects
Surface (mathematics) ,010504 meteorology & atmospheric sciences ,Fine particulate ,Air pollution ,General Medicine ,010501 environmental sciences ,Management, Monitoring, Policy and Law ,Atmospheric sciences ,medicine.disease_cause ,01 natural sciences ,Pollution ,Atmosphere ,Altitude ,Distribution (mathematics) ,Air temperature ,medicine ,Environmental science ,Relative humidity ,0105 earth and related environmental sciences ,General Environmental Science - Abstract
Fine particulate matter (PM2.5) has become a significant issue of ecological environment. However, few studies have explored the vertical distribution of PM2.5 in cities. The objectives of this paper are to reveal the vertical distribution regular pattern of PM2.5 over urban underlying surfaces near the ground with a hexacopter-type unmanned aerial vehicle (UAV) in winter. Results showed that the maximum vertical gradient of PM2.5 near the ground was typically the greatest in the morning as the stable atmospheric conditions. Moreover, regression model illustrated that relative humidity had the greatest impact on the vertical profile of PM2.5 compared to air temperature and altitude as hygroscopic of PM2.5 aerosols. Curve model shown that vertical profile of PM2.5 over the surfaces of water and green space first increased slowly and then declined, besides, the highest concentration inflection of PM2.5 above the water body (23.7 m) is higher than the green space (14.3 m). Thus, suggesting residents living vertical of 10–30 m from the ground around large water bodies and green spaces should not open windows for ventilation in the morning. Therefore, this study provides insights into the vertical distributions of PM2.5 over different underlying surfaces and should be of reference value to urban planners for designing urban spaces to optimize atmosphere environment to provide a healthy living environment.
- Published
- 2021
297. Silicified collagen scaffold induces semaphorin 3A secretion by sensory nerves to improve
- Author
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Yu-Xuan, Ma, Kai, Jiao, Qian-Qian, Wan, Jing, Li, Ming-Yi, Liu, Zi-Bin, Zhang, Wen, Qin, Kai-Yan, Wang, Ya-Zhou, Wang, Franklin R, Tay, and Li-Na, Niu
- Subjects
Silicified collagen scaffolds ,Semaphorin 3A ,Mechanistic target of rapamycin ,Article ,Distal femur defect ,Sensory nerve - Abstract
Sensory nerves promote osteogenesis through the release of neuropeptides. However, the potential application and mechanism in which sensory nerves promote healing of bone defects in the presence of biomaterials remain elusive. The present study identified that new bone formation was more abundantly produced after implantation of silicified collagen scaffolds into defects created in the distal femur of rats. The wound sites were accompanied by extensive nerve innervation and angiogenesis. Sensory nerve dysfunction by capsaicin injection resulted in significant inhibition of silicon-induced osteogenesis in the aforementioned rodent model. Application of extracellular silicon in vitro induced axon outgrowth and increased expression of semaphorin 3 A (Sema3A) and semaphorin 4D (Sema4D) in the dorsal root ganglion (DRG), as detected by the upregulation of signaling molecules. Culture medium derived from silicon-stimulated DRG cells promoted proliferation and differentiation of bone marrow mesenchymal stem cells and endothelial progenitor cells. These effects were inhibited by the use of Sema3A neutralizing antibodies but not by Sema4D neutralizing antibodies. Knockdown of Sema3A in DRG blocked silicon-induced osteogenesis and angiogenesis almost completely in a femoral defect rat model, whereas overexpression of Sema3A promoted the silicon-induced phenomena. Activation of “mechanistic target of rapamycin” (mTOR) pathway and increase of Sema3A production were identified in the DRG of rats that were implanted with silicified collagen scaffolds. These findings support the role of silicon in inducing Sema3A production by sensory nerves, which, in turn, stimulates osteogenesis and angiogenesis. Taken together, silicon has therapeutic potential in orthopedic rehabilitation., Graphical abstract Image 1, Highlights • Nerve innervation, vascularization and tissue mineralization integrated into a single scaffold. • Silicified collagen scaffolds has therapeutic potential in orthopedic rehabilitation. • Silicified collagen scaffolds promote in-situ bone regeneration via sensory nerve innervation and semaphorin 3A production.
- Published
- 2021
298. Calcium phosphate-based composite cement: Impact of starch type and starch pregelatinization on its physicochemical properties and performance in the vertebral fracture surgical models in vitro
- Author
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Haolin Sun, Chun Liu, Linwei He, Qifeng Lu, Yanjie Bai, Huan Zhou, Rui Zhang, Lei Yang, Dandan Chen, Hui Hu, Huilin Yang, Xuan Ma, Huiling Liu, Yixing Tian, and Ningqi Dang
- Subjects
Calcium Phosphates ,Models, Anatomic ,Materials science ,Starch ,Fracture (mineralogy) ,Composite number ,Biomedical Engineering ,chemistry.chemical_element ,macromolecular substances ,02 engineering and technology ,Calcium ,Maize starch ,Biomaterials ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Animals ,Food science ,Cement ,Sheep ,technology, industry, and agriculture ,Bone Cements ,food and beverages ,021001 nanoscience & nanotechnology ,Compressive strength ,chemistry ,Spinal Fractures ,Surgical Models ,0210 nano-technology ,030217 neurology & neurosurgery - Abstract
Calcium phosphate cement (CPC) modified with native and pregelatinized normal corn and waxy maize starches was studied. Effects of starch pregelatinization and starch type on the physicochemical properties of CPC were investigated. CPC modified with pregelatinized normal corn starch (CPB-PNC) or pregelatinized waxy maize starch (CPB-PW) was evaluated by two vertebral fracture surgical models in vitro. Both granular and pregelatinized starches significantly improved the setting times and injectability of CPC, but only the pregelatinized starches improved the anti-collapsibility and compressive strength of CPC significantly. CPB-PW, whose micro-structure was compact and uniform, showed the best physicochemical properties. Addition of starch did not inhibit the hydro-reaction of CPC. Unmodified CPC had very poor dispersibility and could not apply in the tests of the surgical models. Pregelatinized starch especially waxy maize starch improved the dispersibility of CPC and showed good dispersion area, volume, improved pull-out force and maximum torque in the Sawbones sponge model. Similarly, in the minimally invasive kyphoplasty model, CPB-PNC and CPB-PW could disperse in the osteoporotic sheep vertebrae and improve the compressive strength of the sheep vertebral body. In conclusion, starch pregelatinization and starch botanical source affect the physicochemical properties of CPC significantly. Bone cements modified by different starches also performed differently in surgical models for osteoporotic vertebral fracture. Pregelatinized waxy maize starch may be a better candidate for CPC modification comparing to the pregelatinized normal corn starch.
- Published
- 2021
299. A Glb1-2A-mCherry reporter monitors systemic aging and predicts lifespan in middle-aged mice
- Author
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Jie Sun, Ming Wang, Yaqi Zhong, Xuan Ma, Shimin Sun, Chenzhong Xu, Linyuan Peng, Guo Li, Liting Zhang, Zuojun Liu, Ding Ai, and Baohua Liu
- Subjects
Mice ,Aging ,Bleomycin ,Multidisciplinary ,Glycoside Hydrolases ,Genes, Reporter ,Longevity ,Dasatinib ,General Physics and Astronomy ,Animals ,General Chemistry ,General Biochemistry, Genetics and Molecular Biology ,Cellular Senescence - Abstract
The progressive decline of physiological function and the increased risk of age-related diseases challenge healthy aging. Multiple anti-aging manipulations, such as senolytics, have proven beneficial for health; however, the biomarkers that label in vivo senescence at systemic levels are lacking, thus hindering anti-aging applications. In this study, we generate a Glb1+/m‒Glb1-2A-mCherry (GAC) reporter allele at the Glb1 gene locus, which encodes lysosomal β-galactosidase—an enzyme elevated in tissues of old mice. A linear correlation between GAC signal and chronological age is established in a cohort of middle-aged (9 to 13 months) Glb1+/m mice. The high GAC signal is closely associated with cardiac hypertrophy and a shortened lifespan. Moreover, the GAC signal is exponentially increased in pathological senescence induced by bleomycin in the lung. Senolytic dasatinib and quercetin (D + Q) reduce GAC signal in bleomycin treated mice. Thus, the Glb1-2A-mCherry reporter mice monitors systemic aging and function decline, predicts lifespan, and may facilitate the understanding of aging mechanisms and help in the development of anti-aging interventions.
- Published
- 2021
300. The epidemiology of blood transfusion in hospitalized children: a national cross-sectional study in China
- Author
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Kai Guo, Xin Ni, Shu-Xuan Ma, Xin-Yu Wang, Guoshuang Feng, Jian Tian, and Yueping Zeng
- Subjects
medicine.medical_specialty ,Blood transfusion ,Cross-sectional study ,business.industry ,medicine.medical_treatment ,Pediatrics, Perinatology and Child Health ,Epidemiology ,Emergency medicine ,MEDLINE ,medicine ,China ,business ,Letter to the Editor - Published
- 2021
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