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Modeling impulsive resource inputs in host-parasitoid interactions with time delays

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International Journal of Biomathematics 2018年第5期11卷 67-92页

作者： Shouzong liu Mingzhan Huang Xinyu Song Shuai Li Huidong cheng College of Mathematics and Statistics Xinyang Normal University Xinyang 464000 P. R. China College of Mathematics and Systems Science Shandong University of Science and Technology Qingdao 2.6000 P. R. China

For the interaction of parasitoids and their insect hosts in the laboratory environment, a novel mathematical model with impulsive resource inputs, stage-structure, maturation delays and negative binomial distribution is proposed. Based on the adaptability of the insect host to the environment, we study the permanence of the system in two cases and gain conditions under which the host and parasitoid species can coexist with impulsive resource inputs. We also discuss the existence of the positive periodic solution when the system is permanent by applying a fixed point theory. Besides, we perform numerical simulations which not only confirm but also further enhance our theoretical results. The simulations show that when total input of resource is fixed, smaller input amounts with shorter periods of impulsive delivery produce smaller oscillation amplitudes for both the host and parasitoid populations at the juvenile stage. However, both the densities of adult host and adult parasitoid are not affected by the resource management strategy. Furthermore, we also reconfirm that larger maturation delays, either the host or the parasitoid＇s delay, lead to any more individuals staying at the inmature stage of the species, while the adult populations decline dramatically at the same time. On the other hand, larger host maturation delays promote the parasitoid＇s population growth at both stages, and the impact of parasitoid maturation delay on the host population is almost the same but not as dramatic. These findings give us a deeper understanding about the host parasitoid interaction in laboratory environment.

关键词： Host parasitoid model maturation delay impulsive input permanence periodic solution.

Whole-genome sequencing and analysis of the Chinese herbal plant Gelsemium elegans

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Acta Pharmaceutica Sinica B 2020年第2期10卷 374-382页

作者： Yisong liu Qi Tang Pi cheng Mingfei Zhu Hui Zhang Jiazhe liu Mengting Zuo Chongyin Huang Changqiao Wu Zhiliang Sun Zhaoying liu Hunan Engineering Technology Research Center of Veterinary Drugs Hunan Agricultural UniversityChangsha 410128China Hunan Key Laboratory of Traditional Chinese Veterinary Medicine Hunan Agricultural UniversityChangsha 410128China College of Veterinary Medicine Hunan Agricultural UniversityChangsha 410128China Nextomics Biosciences Institute Wuhan 430000China

Gelsemium elegans(***)(2.n=2.x=16)is genus of flowering plants belonging to the Gelsemicaeae ***,a high-quality genome assembly using the Oxford Nanopore Technologies(ONT)platform and high-throughput chromosome conformation capture techniques(Hi-C)were used.A total of 56.11 Gb of raw GridION X5 platform ONT reads(6.2. Gb per cell)were *** filtering,53.45 Gb of clean reads were obtained,giving 160 x coverage *** de novo genome assemblies 335.13 Mb,close to the 338 Mb estimated by k-mer analysis,was generated with contig N50 of 10.2. *** vast majority(99.2.)of the *** assembled sequence was anchored onto 8 *** genome completeness was then evaluated and 1338 of the 1440 conserved genes(92.9%)could be found in the *** annotation revealed that 43.16%of the *** genome is composed of repetitive elements and 2..9%is composed of long terminal repeat *** predicted 2.,768 protein-coding genes,of which 84.56%were functionally *** genomic sequences of *** could be a valuable source for comparative genomic analysis in the Gelsemicaeae family and will be useful for understanding the phylogenetic relationships of the indole alkaloid metabolism.

关键词： Gelsemium elegans Nanopore sequencing Genome assembly Hi-C Genome annotation Monoterpene indole alkaloid

Advances in the development of power supplies for the Internet of Everything

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InfoMat 2019年第2期1卷 130-139页

作者： Xiayue Fan Xiaorui liu Wenbin Hu cheng Zhong Jun Lu Key Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education) School of Materials Science and EngineeringTianjin UniversityTianjinChina Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhouChina Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and EngineeringTianjin UniversityTianjinChina Chemical Sciences and Engineering Division Argonne National LaboratoryLemontIllinois

The Internet of Everything(IoE),which aims to realize information exchange and communications for anything with the Internet,has revolutionized our modern *** as the driving force for devices in the IoE network,power supply systems play a fundamental role in the development of the ***,due to the complexity,multifunctionality and wide-scale deployment of diverse applications,power supply systems face great challenges,including distribution,connection,charging technologies,and *** this review,some challenges and advances in the development of both power supply systems and their units are *** the overall system-level field,establishing sustainable and maintenancefree power supply systems through wireless connections,efficient power management and integrated energy harvesting and storage systems is ***,the main performance metrics of power supply units are discussed,including energy density,service life,and self-power *** addition,some directions of power quality assessment for both the system and unit levels of power supply systems are presented,aiming to provide insight into the future development of high-performance power supply systems for the IoE.

关键词： assessment of power supply systems Internet of Everything power supply systems power supply units

Survey of antioxidant capacity and phenolic composition of blueberry,blackberry,and strawberry in Nanjing

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2012年第2期13卷 94-102页

作者： Wu-yang HUANG Hong-cheng ZHANG Wen-xu liu Chun-yang LI Department of Functional Food and Bioactive Compounds Institute of Farm Product ProcessingJiangsu Academy of Agricultural SciencesNanjing 210014China Bee Research Institute Chinese Academy of Agricultural SciencesBeijing 100093China College of Food Science and Technology Nanjing Agricultural UniversityNanjing 210095China

Berries are a good source of natural antioxidants. In the present study, the total antioxidant capacity and phenolic composition of three berry fruits （blueberry, blackberry, and strawberry） cultivated in Nanjing were investigated. Blueberry, with a Trolox equivalent antioxidant capacity （TEAC） value of 14.98 mmol Trolox/100 g dry weight （DW） exhibited the strongest total antioxidant capacity using both the 2.2.azinobis（3-ethylbenzothiazoline-6-sulfonic acid） diammonium salt （ABTS） and the 2.2.diphenyl-l-picrylhydrazyl （DPPH） methods. Blueberry also had the highest total phenolic content （TPC, 9.44 mg gallic acid/g DW）, total flavonoid content （TFC, 36.06 mg rutin/g DW）, and total anthocyanidin content （TAC, 2..38 mg catechin/g DW）. A preliminary analysis using high performance liquid chromatography （HPLC） showed that the blueberry, blackberry, and strawberry samples tested contained a range of phenolic acids （including gallic acid, protocatechuic acid, p-hydroxybenzoic acid, vanillic acid, caffeic acid, p-coumaric acid, ferulic acid, eUagic acid, and cinnamic acid） and various types of flavonoids （flavone： luteolin; flavonols： rutin, myricetin, quercetrin, and quercetin; flavanols： gallocatechin, epigallocatechin, catechin, and catechin gallate; anthocyanidins： malvidin-3-galactoside, malvidin-3-glucoside, and cyanidin）. In particular, the blueberries had high levels of proanthocyanidins and anthocyanidins, which might be responsible for their strong antioxidant activities. These results indicate a potential market role for berries （especially blueberries） as a functional food ingredient or nutraceutical.

关键词： Berries Antioxidants Phenolics Flavonoids Anthocyanidins

What can the changes in shield resistance tell us during the period of shearer's cutting and neighboring shields' advance?

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International Journal of Mining Science and Technology 2015年第3期25卷 361-367页

作者： cheng Jingyi Wan Zhijun Peng Syd S. liu Sifei Ji Yinlin School of Mines Key Laboratory of Deep Coal Resource MiningMinistry of Education of ChinaChina University of Mining and Technology Department of Mining Engineering West Virginia University

In order to determine the influence of shearer's cutting and neighboring shields' advance on the support resistance variation, leg pressure data of all 2.5 shields in the panel LW61 of Cumberland coal mine were analyzed. The results show that the relationship between the leg pressure increment and the distance from shield to front drum of shearer is a quadratic function and that the higher leg pressure increment before shield advance tends to be related to adverse roof conditions. In addition, the three proposed leg pressure increment-related parameters and the three traditional parameters(time-weighted average pressure, setting pressure, and final pressure) of approximately 32.00 shield supporting cycles were calculated by a self-developed software package to analyze the correlation between them. The results show that there is a powerful connection between them, and that the three proposed leg pressure increment-related parameters could be used as the indexes to evaluate the interaction between shields and the roof, and to identify the periodic weighting.

关键词： Electrohydraulic control shield support Period of shearer's cutting and neighboring shields' advanceLeg pressure increment Shield-roof interaction

Endoscopic mucosal resection for rectal carcinoids under micro-probe ultrasound guidance

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World Journal of Gastroenterology 2013年第16期19卷 2555-2559页

作者： Fu-Run Zhou liu-Ye Huang cheng-Rong Wu Department of Gastroenterology Yu Huang Ding Hospital affiliated to Qingdao University School of Medicine

AIM: To assess the therapeutic value of endoscopic mucosal resection (EMR) under micro-probe ultrasound guidance for rectal carcinoids less than 1 cm in diameter. METHODS: Twenty-one patients pathologically diagnosed with rectal carcinoids following colonoscopy in our hospital from January 2.07 to November 2.12.were included in this study. The patients consisted of 14 men and 7 women, with a mean age of 52.3 ± 12.2.years (range: 36-72.years). The patients with submucosal tumors less than 1 cm in diameter arising from the rectal and muscularis mucosa detected by micro-probe ultrasound were treated with EMR and followed up with conventional endoscopy and micro-probe ultrasound. RESULTS: All of the 2. tumors were confirmed by micro-probe ultrasound as uniform hypoechoic masses originating from the rectal and muscularis mucosa, without invasion of muscularis propria and vessels, and less than 1 cm in diameter. EMR was successfully completed without bleeding, perforation or other complications. The resected specimens were immunohistochemically confirmed to be carcinoids. Patients were followed up for one to two years, and no tumor recurrence was reported. CONCLUSION: EMR is a safe and effective treatment for rectal carcinoids less than 1 cm in diameter.

关键词： Micro-probe ultrasound Endoscopic mucosal resection Rectal carcinoid Endoscopic submucosal dissection Submucosal tumors

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我国东部山地针阔混交林碳通量特征分析

中国环境科学 2024年第6期44卷 3492-3501页

作者：孙彦坤张胤洲姚维杰叶京张峻搏潘小乐刘兰忠王自发程雪玲东北农业大学资源与环境学院黑龙江哈尔滨150030 中国科学院大气物理研究所大气边界层物理与大气化学国家重点实验室北京100029 中国科学院大气物理研究所大气边界层顶生态环境上黄观测站浙江金华321203

以浙江省金华市武义县大毛尖山为研究区域,开展复杂山地森林生态系统碳汇能力的观测研究,并利用涡动相关法在2.2.年6月~2.2.年5月进行观测,经过数据质量控制和质量评价分析,得到42.的优质CO_(2.通量数据.结果表明,大毛尖山周边以针阔混... 详细信息

以浙江省金华市武义县大毛尖山为研究区域,开展复杂山地森林生态系统碳汇能力的观测研究,并利用涡动相关法在2.2.年6月~2.2.年5月进行观测,经过数据质量控制和质量评价分析,得到42.的优质CO_(2.通量数据.结果表明,大毛尖山周边以针阔混交林为主,能量闭合度为0.89,能够很好的代表站点通量情况.CO_(2.通量在日尺度上均表现为U型变化,范围为-1.2.~0.89mgCO_(2./(m^(2.·s).四季碳汇能力强弱依次为,夏季、春季、秋季、冬季;各月份净生态系统碳交换量(NEE)均为负值,整体表现为碳汇.CO_(2.通量与气象因子中的空气温度呈负相关,相对湿度和平均风速正相关,夜间因呼吸作用产生的CO_(2.通量与土壤温度正相关.本研究初步解释了大毛尖山森林生态系统的碳汇特征.

关键词： CO_(2.通量涡动相关法(EC) 净生态系统碳交换量(NEE) 森林生态系统复杂地形

Sodium hydride-mediated synthesis of 1,5-diaryl-1,2.3-triazoles from anti-3-aryl-2.3-dibromopropanoic acids and organic azides

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Chinese Chemical Letters 2013年第8期24卷 764-766页

作者： Xue-Zhi cheng Wei liu Zhen-Dong Huang Chun-Xiang Kuang Department of Chemistry Tongji University Zhejiang Citrus Research Institute Key Laboratory of Yangtze River Water Environment Ministry of Education

A series of 1,5-disubstituted 1,2.3-triazoles are synthesized by a one-pot process from anti-3-aryl-2.3-dibromopropanoic acids and organic azides mediated by sodium hydride in dimethyl *** reaction is mild and simple,... 详细信息

关键词： Cyclizations Heterocycles Sodium hydride Triazoles

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铀矿井降氡优势通风方式研究

辐射防护 2024年第1期44卷 80-84页

作者：李先杰张哲胡鹏华陈刚任建军刘啸晨核工业北京化工冶金研究院北京101149 核工业湖南矿冶局长沙410007

本文以矿井通风网络入风段和用风段氡析出规律为出发点,由铀矿通风降氡基本方程导出不同通风方式下铀矿降氡需风量的计算公式,并由入风段有效供风能力导出优势通风方式评价指标,给出铀矿通风降氡方式的判别方法。

关键词：铀矿通风方式降氡判别