西南冬麦区气候冬干春旱频发、土壤速效磷缺乏,限制冬小麦氮素吸收。本研究探究秋闲期秸秆覆盖与施磷对小麦根系NO3-吸收动力势、氮素吸收利用、叶绿素含量和籽粒产量的影响,以期为小麦高产稳产及养分的高效利用提供理论依据。试验于202...西南冬麦区气候冬干春旱频发、土壤速效磷缺乏,限制冬小麦氮素吸收。本研究探究秋闲期秸秆覆盖与施磷对小麦根系NO3-吸收动力势、氮素吸收利用、叶绿素含量和籽粒产量的影响,以期为小麦高产稳产及养分的高效利用提供理论依据。试验于2020—2022年在四川仁寿进行,采用二因素裂区设计,以秸秆覆盖(SM)和不覆盖(NSM)为主区;3个磷水平0(P0)、75(P75)和120(P120) kg hm-2为裂区。结果表明:秸秆覆盖与施磷显著提高地上部磷素积累量, SM较NSM的小麦根尖NO3-净吸收速率、籽粒氮积累量、氮素转运量、氮素同化量、氮肥偏生产力和籽粒产量分别增加28.2%、8.4%、9.0%、41.9%、23.3%和21.9%。与P0相比, P75和P120增加幅度分别达到35.1%~37.6%、12.6%~19.0%、7.1%~9.3%、35.7%~60.5%、17.6%~23.8%、17.2%~23.6%。与NSM相比, SM的小麦旗叶灌浆期叶绿素含量上升,进而提高籽粒产量。综上所述,秸秆覆盖与施磷可促进小麦根尖NO3-吸收,提高叶绿素含量,从而显著增加花后氮素的吸收及营养器官临时贮存氮素向籽粒的再分配,最终提高籽粒产量。考虑经济效益和产量回报,西南地区小麦高产高效栽培时,推荐采用秋闲期秸秆覆盖配施磷肥75 kg hm-2。展开更多
Pectin is a major constituent of the plant cell wall.Pectate lyase(PEL,EC 4.2.2.2)uses anti-β-elimination chemistry to cleave theα-1,4 glycosidic linkage in the homogalacturonan region of pectin.However,limited info...Pectin is a major constituent of the plant cell wall.Pectate lyase(PEL,EC 4.2.2.2)uses anti-β-elimination chemistry to cleave theα-1,4 glycosidic linkage in the homogalacturonan region of pectin.However,limited information is available on the comprehensive and evolutionary analysis of PELs in the Malvaceae.In this study,we identified 597PEL genes from 10 Malvaceae species.Phylogenetic and motif analyses revealed that these PELs are classified into six subfamilies:Clades I,II,III,IV,Va,and Vb.The two largest subfamilies,Clades I and II,contained 237 and222 PEL members,respectively.The members of Clades Va and Vb only contained four or five motifs,far fewer than the other subfamilies.Gene duplication analysis showed that segmental duplication played a crucial role in the expansion of the PEL gene family in Gossypium species.The PELs from Clades I,IV,Va,and Vb were expressed during the fiber elongation stage,but nearly all PEL genes from Clades II and III showed no expression in any of the investigated fiber developmental stages.We further performed single-gene haplotype association analysis in 2,001G.hirsutum accessions and 229 G.barbadense accessions.Interestingly,14 PELs were significantly associated with fiber length and strength traits in G.barbadense with superior fiber quality,while only eight GhPEL genes were found to be significantly associated with fiber quality traits in G.hirsutum.Our findings provide important information for further evolutionary and functional research on the PEL gene family members and their potential use for fiber quality improvement in cotton.展开更多
目的通过Cite Space对癫痫患者海马硬化研究现状、热点及趋势进行可视化分析。方法应用Cite Space对2019年1月至2023年8月中国知网及Web of Science核心合集数据库中癫痫患者海马硬化相关文献期刊、国家、机构和关键词等进行可视化分析...目的通过Cite Space对癫痫患者海马硬化研究现状、热点及趋势进行可视化分析。方法应用Cite Space对2019年1月至2023年8月中国知网及Web of Science核心合集数据库中癫痫患者海马硬化相关文献期刊、国家、机构和关键词等进行可视化分析,并绘制图谱。结果共纳入中文文献95篇,英文文献977篇。国内外发文量最多的杂志为癫痫杂志、EPILPSIA。国内外发文量最多的作者为许尚文、Cendes Fernando。国内外最活跃的机构为浙江大学医学院附属第二医院神经内科和伦敦大学学院。美国是这一领域的主要推动力。热点关键词有海马硬化、癫痫、颞叶癫痫,聚类为海马、颞叶癫痫、海马硬化等。结论相关研究以国外为主,国内各机构有待提高,研究癫痫患者海马硬化的分子生物学方向可能成为近几年的研究热点。展开更多
BACKGROUND The stent embedded in the esophageal mucosa is one of the complications after stenting for esophageal stricture.We present a case of stent adjustment with the aid of a transparent cap after endoscopic injec...BACKGROUND The stent embedded in the esophageal mucosa is one of the complications after stenting for esophageal stricture.We present a case of stent adjustment with the aid of a transparent cap after endoscopic injection of an esophageal varices stent.CASE SUMMARY A 61-year-old male patient came to the hospital with discomfort of the chest after the stent implanted for the stenosis because of endoscopic injection of esophageal varices.The gastroscopy was performed,and the stent embedded into the esophageal mucosa.At first,we pulled the recycling line for shrinking the stent,however,the mucosa could not be removed from the stent.Then a forceps was performed to remove the mucosa in the stent,nevertheless,the bleeding form the mucosa was obvious.And then,we used a transparent cap to scrape the mucosa along the stent,and the mucosa were removed successfully without bleeding.CONCLUSION A transparent cap helps gastroscopy to remove the mucosa embedded in the stent after endoscopic injection of the esophageal varices stent.展开更多
According to the multi-time-scale characteristics of power generation and demand-side response(DR)resources,as well as the improvement of prediction accuracy along with the approaching operating point,a rolling peak s...According to the multi-time-scale characteristics of power generation and demand-side response(DR)resources,as well as the improvement of prediction accuracy along with the approaching operating point,a rolling peak shaving optimization model consisting of three different time scales has been proposed.The proposed peak shaving optimization model considers not only the generation resources of two different response speeds but also the two different DR resources and determines each unit combination,generation power,and demand response strategy on different time scales so as to participate in the peaking of the power system by taking full advantage of the fast response characteristics of the concentrating solar power(CSP).At the same time,in order to improve the accuracy of the scheduling results,the combination of the day-ahead peak shaving phase with scenario-based stochastic programming can further reduce the influence of wind power prediction errors on scheduling results.The testing results have shown that by optimizing the allocation of scheduling resources in each phase,it can effectively reduce the number of starts and stops of thermal power units and improve the economic efficiency of system operation.The spinning reserve capacity is reduced,and the effectiveness of the peak shaving strategy is verified.展开更多
文摘西南冬麦区气候冬干春旱频发、土壤速效磷缺乏,限制冬小麦氮素吸收。本研究探究秋闲期秸秆覆盖与施磷对小麦根系NO3-吸收动力势、氮素吸收利用、叶绿素含量和籽粒产量的影响,以期为小麦高产稳产及养分的高效利用提供理论依据。试验于2020—2022年在四川仁寿进行,采用二因素裂区设计,以秸秆覆盖(SM)和不覆盖(NSM)为主区;3个磷水平0(P0)、75(P75)和120(P120) kg hm-2为裂区。结果表明:秸秆覆盖与施磷显著提高地上部磷素积累量, SM较NSM的小麦根尖NO3-净吸收速率、籽粒氮积累量、氮素转运量、氮素同化量、氮肥偏生产力和籽粒产量分别增加28.2%、8.4%、9.0%、41.9%、23.3%和21.9%。与P0相比, P75和P120增加幅度分别达到35.1%~37.6%、12.6%~19.0%、7.1%~9.3%、35.7%~60.5%、17.6%~23.8%、17.2%~23.6%。与NSM相比, SM的小麦旗叶灌浆期叶绿素含量上升,进而提高籽粒产量。综上所述,秸秆覆盖与施磷可促进小麦根尖NO3-吸收,提高叶绿素含量,从而显著增加花后氮素的吸收及营养器官临时贮存氮素向籽粒的再分配,最终提高籽粒产量。考虑经济效益和产量回报,西南地区小麦高产高效栽培时,推荐采用秋闲期秸秆覆盖配施磷肥75 kg hm-2。
基金supported by the Ministry of Agriculture and Rural Affairs,China(2023ZD04039-01)the National Natural Science Foundation of China(32172008)the Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang,China(2019R01002)。
文摘Pectin is a major constituent of the plant cell wall.Pectate lyase(PEL,EC 4.2.2.2)uses anti-β-elimination chemistry to cleave theα-1,4 glycosidic linkage in the homogalacturonan region of pectin.However,limited information is available on the comprehensive and evolutionary analysis of PELs in the Malvaceae.In this study,we identified 597PEL genes from 10 Malvaceae species.Phylogenetic and motif analyses revealed that these PELs are classified into six subfamilies:Clades I,II,III,IV,Va,and Vb.The two largest subfamilies,Clades I and II,contained 237 and222 PEL members,respectively.The members of Clades Va and Vb only contained four or five motifs,far fewer than the other subfamilies.Gene duplication analysis showed that segmental duplication played a crucial role in the expansion of the PEL gene family in Gossypium species.The PELs from Clades I,IV,Va,and Vb were expressed during the fiber elongation stage,but nearly all PEL genes from Clades II and III showed no expression in any of the investigated fiber developmental stages.We further performed single-gene haplotype association analysis in 2,001G.hirsutum accessions and 229 G.barbadense accessions.Interestingly,14 PELs were significantly associated with fiber length and strength traits in G.barbadense with superior fiber quality,while only eight GhPEL genes were found to be significantly associated with fiber quality traits in G.hirsutum.Our findings provide important information for further evolutionary and functional research on the PEL gene family members and their potential use for fiber quality improvement in cotton.
基金Supported by Hangzhou Agricultural and Social Development Research Guidance Project,No.20220919Y037.
文摘BACKGROUND The stent embedded in the esophageal mucosa is one of the complications after stenting for esophageal stricture.We present a case of stent adjustment with the aid of a transparent cap after endoscopic injection of an esophageal varices stent.CASE SUMMARY A 61-year-old male patient came to the hospital with discomfort of the chest after the stent implanted for the stenosis because of endoscopic injection of esophageal varices.The gastroscopy was performed,and the stent embedded into the esophageal mucosa.At first,we pulled the recycling line for shrinking the stent,however,the mucosa could not be removed from the stent.Then a forceps was performed to remove the mucosa in the stent,nevertheless,the bleeding form the mucosa was obvious.And then,we used a transparent cap to scrape the mucosa along the stent,and the mucosa were removed successfully without bleeding.CONCLUSION A transparent cap helps gastroscopy to remove the mucosa embedded in the stent after endoscopic injection of the esophageal varices stent.
基金support of the projects Youth Science Foundation of Gansu Province(Source-Grid-Load Multi-Time Interval Optimization Scheduling Method Considering Wind-PV-CSP Combined DC Transmission,No.22JR11RA148)Youth Science Foundation of Lanzhou Jiaotong University(Research on Coordinated Dispatching Control Strategy of High Proportion New Energy Transmission Power System with CSP Power Generation,No.2020011).
文摘According to the multi-time-scale characteristics of power generation and demand-side response(DR)resources,as well as the improvement of prediction accuracy along with the approaching operating point,a rolling peak shaving optimization model consisting of three different time scales has been proposed.The proposed peak shaving optimization model considers not only the generation resources of two different response speeds but also the two different DR resources and determines each unit combination,generation power,and demand response strategy on different time scales so as to participate in the peaking of the power system by taking full advantage of the fast response characteristics of the concentrating solar power(CSP).At the same time,in order to improve the accuracy of the scheduling results,the combination of the day-ahead peak shaving phase with scenario-based stochastic programming can further reduce the influence of wind power prediction errors on scheduling results.The testing results have shown that by optimizing the allocation of scheduling resources in each phase,it can effectively reduce the number of starts and stops of thermal power units and improve the economic efficiency of system operation.The spinning reserve capacity is reduced,and the effectiveness of the peak shaving strategy is verified.
