检索结果-南通市图书馆

Negative effects of Microcystis blooms on the crustacean plankton in an enclosure experiment in the subtropical China

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2005年第5期17卷 775-781页

作者： CHEN Fei-zhou xie ping TANG Hui-juan LIU Hong Donghu Experimental Station of Lake Ecosystems State Key Laboratory for Freshwater Eeology and Biotechnology of China Institute of Hydrobiology Chinese Academy of Sciences Wuhan 430072 China Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China

Effects of Microcystis blooms on the crustacean plankton were studied using enclosure experiments during July-September, 2000. Eight enclosures were set in the hypereutrophic Donghu Lake. Different nutrient concentrations through additional nutrient and sediment in enclosures were expected to result in different abundance of Microcystis. From July to early August, the phytoplankton community was dominated by Chlorophyta, Cryptophyta, Bacillariophyta and Cyanophyta other than Microcystis aeruginosa. M. aeruginosa showed a rapid increase during early August in all enclosures and predominated. Crustacean plankton was dominated by the herbivorous Moina micrura, Diaphanosoma brachyurum and Ceriodaphnia cornuta, and the predaceous Mesocyclops sp. and Thermocyclops taihokuensis. During the pre-bloom period, the dynamics of M. micrura population appeared to be mainly affected by the predaceous cyclopoids. With the development of Microcystis blooms, such interaction between M. micrura and cyclopoids seemed weakened, especially when the Microcystis biomass was high. But there was no apparent influence on the interaction between Leptodora kindti and its zooplanktonic prey. The density of two cyclopoids decreased with the enhancement of Microcystis. The density decline of M. micrura was caused by both predation and inhibition by Microcystis. The low food availability of other edible phytoplankton during the blooms led to low densities of both C. cornuta and D. brachyurum by late August. It appears that dense Microcystis blooms exert strong negative effects on the herbivorous cladocerans and the predaceous cyclopoids.

关键词： crustacean plankton cladocerans cyclopoids food availability Microcystis bloom

Eco-chemical mechanisms govern phytoplankton emissions of dimethylsulfide in global surface waters

在线全文

学校读者我要写书评

暂无评论

National Science Review 2021年第2期8卷 43-50页

作者： Xuwei Deng Jun Chen Lars-Anders Hansson Xia Zhao ping xie Donghu Experimental Station of Lake Ecosystems State Key Laboratory of Freshwater Ecology and Biotechnology of ChinaInstitute of HydrobiologyChinese Academy of Sciences Department of Biology/Aquatic Ecology Lund University State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of Sciences Institute for Ecological Research and Pollution Control of Plateau Lakes School of Ecology and Environmental ScienceYunnan University

The anti-greenhouse gas dimethylsulfide(DMS) is mainly emitted by algae and accounts for more than half of the total natural flux of gaseous sulfur to the atmosphere, strongly reducing the solar radiation and thereby the temperature on Earth. However, the relationship between phytoplankton biomass and DMS emissions is debated and inconclusive. Our study presents field observations from 100 freshwater lakes, in concert with data of global ocean DMS emissions, showing that DMS and algal biomass show a hump-shaped relationship, i.e. DMS emissions to the atmosphere increase up to a p H of about 8.1 but, at higher p H, DMS concentrations decline, likely mainly due to decomposition. Our findings from lake and ocean ecosystems worldwide were corroborated in experimental studies. This novel finding allows assessments of more accurate global patterns of DMS emissions and advances our knowledge on the negative feedback regulation of phytoplankton-driven DMS emissions on climate.

关键词： phytoplankton lake ecosystem biological regulation of global climate dimethylsulfide global surface oceans

融合多感官刺激的虚拟现实—脑机接口手功能增强康复系统

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

生物医学工程学杂志 2024年第4期41卷 656-663页

作者：邵谢宁张艺滢张栋门延帝王子龙陈晓玲谢平燕山大学电气工程学院河北秦皇岛066000 河北省智能康复及神经调控重点实验室河北秦皇岛066000 北京理工大学设计与艺术学院北京100081

脑卒中(stroke)是由于脑部血液供应突然中断或脑血管破裂,导致脑细胞损伤进而损害患者运动和认知能力的一种急性脑血管疾病。融合脑—机接口(BCI)和虚拟现实(VR)的新型康复训练模式,不仅能促进脑网络功能激活,而且能为患者提供沉浸感强... 详细信息

脑卒中(stroke)是由于脑部血液供应突然中断或脑血管破裂,导致脑细胞损伤进而损害患者运动和认知能力的一种急性脑血管疾病。融合脑—机接口(BCI)和虚拟现实(VR)的新型康复训练模式,不仅能促进脑网络功能激活,而且能为患者提供沉浸感强、趣味性强的情境反馈。本文设计了融合多感官刺激反馈、BCI和VR的手部康复训练系统,通过虚拟场景的任务引导患者运动想象,获取患者运动意图,进而在虚拟场景下进行人机交互;同时,融入触觉反馈进一步增加患者本体感受,从而实现基于视、听、触觉多感官刺激反馈的手功能康复训练。本研究通过对比分析加入触觉反馈前后的脑电信号数据内不同频段功率谱密度的差异,发现加入触觉反馈后运动脑区被明显激活,运动脑区的功率谱密度在高γ频段有显著提升。研究结果说明,患者在融合多感官刺激的VR—BCI手功能增强康复系统中进行康复训练,能够加速感觉传导通路和运动传导通路的双向促通,从而加速康复进程。

关键词：脑—机接口虚拟现实触觉反馈手功能康复多感官刺激反馈

化滞柔肝颗粒对湿热中阻型非酒精性脂肪性肝病患者的临床疗效及对炎症因子的影响

在线全文

学校读者我要写书评

暂无评论

中国医药导报 2024年第11期21卷 117-121页

作者：谢萍孙勤国易慧芳湖北中医药大学中医临床学院湖北武汉430065 湖北民族学院附属民大医院中医科湖北恩施445000

目的探讨化滞柔肝颗粒对湿热中阻型非酒精性脂肪性肝病(NAFLD)的临床治疗效果,并观察其对外周血清中炎症因子的干预作用。方法选取2021年1月至12月武汉市第三医院就诊的湿热中阻型NAFLD患者90例作为研究对象,采用随机数字表法将其分为... 详细信息

目的探讨化滞柔肝颗粒对湿热中阻型非酒精性脂肪性肝病(NAFLD)的临床治疗效果,并观察其对外周血清中炎症因子的干预作用。方法选取2021年1月至12月武汉市第三医院就诊的湿热中阻型NAFLD患者90例作为研究对象,采用随机数字表法将其分为治疗组和对照组,每组45例。对照组在基础治疗的基础上加用多烯磷脂酰胆碱胶囊,治疗组在基础治疗的基础上加用化滞柔肝颗粒,两组均连续治疗3个月。比较两组治疗前后的体重指数、血脂、肝功能及炎症指标(Toll样受体-4、髓样分化因子88、核因子κB)。结果治疗后,两组甘油三酯,丙氨酸转氨酶,天冬氨酸转氨酶水平均低于治疗前,且治疗组低于对照组(P0.05)。两组治疗前后体温、心率等生命体征,及心电图等安全性指标未发现明显变化。结论化滞柔肝颗粒治疗湿热中阻型NAFLD临床效果显著,可减轻体重,下调体重指数,改善血脂与肝功能,下调炎症因子,抑制炎症反应。

关键词：非酒精性脂肪性肝病化滞柔肝颗粒 Toll样受体-4

在线全文

学校读者我要写书评

暂无评论

我院静脉配置中心抗肿瘤药不合理用药分析

海峡药学 2024年第2期36卷 87-89页

作者：黄润生谢建平厦门大学附属第一医院福建厦门361000

目的分析我院静脉用药调配中心抗肿瘤药不合理用药情况,为临床抗肿瘤静脉用药提供参考,促进临床合理用药,保障肿瘤患者用药安全。方法我院2022年度住院静脉用药调配中心抗肿瘤用药医嘱10098份,依据药品说明书、相关文献等相关资料对87... 详细信息

目的分析我院静脉用药调配中心抗肿瘤药不合理用药情况,为临床抗肿瘤静脉用药提供参考,促进临床合理用药,保障肿瘤患者用药安全。方法我院2022年度住院静脉用药调配中心抗肿瘤用药医嘱10098份,依据药品说明书、相关文献等相关资料对87份不合理医嘱进行统计分析。结果我院2022年度住院静脉用药调配中心医嘱10098份,其中有不合理用药医嘱87份,每个科室均存在不合理用药情况,妇科的不合理医嘱数最多,其占比23.08%;静脉用药调配中心抗肿瘤药不合理用药情况主要包括溶媒错误(40.23%)、药物剂量不合理(29.89%)、给药顺序不合理(18.39%)、给药时间不合理(11.49%)。结论应加强我院的静脉用药调配中心抗肿瘤药不合理用药情况和抗肿瘤药溶媒管理,加强医师对抗肿瘤药物性质的认知,合理规范选择药物,同时药剂师应严格审核医嘱,以最大幅度减少不合理用药情况。

关键词：静脉用药调配中心抗肿瘤药不合理用药

在线全文

学校读者我要写书评

暂无评论

风机偏航减速机断齿故障分析及处理

水电站机电技术 2024年第6期47卷 106-108页

作者：谢平田毅辉冯大为五凌电力有限公司新能源分公司湖南长沙410029

某山地风电场地形地貌复杂,季节性湍流大,导致个别风机偏航减速机断齿故障较频繁,通过对个别风机机位微观选址、机舱振动、偏航角度出现滑移、日常维护保养情况进行分析研究,发现个别风机机位地势复杂,风况紊乱等问题引起风机偏航减速... 详细信息

某山地风电场地形地貌复杂,季节性湍流大,导致个别风机偏航减速机断齿故障较频繁,通过对个别风机机位微观选址、机舱振动、偏航角度出现滑移、日常维护保养情况进行分析研究,发现个别风机机位地势复杂,风况紊乱等问题引起风机偏航减速机外载冲击较大,在风机上集中表现为机组振动较多、偏航滑移角度大及偏航减速机漏油,导致风机偏航减速机频繁断齿现象,针对上述特殊情况,提出风机危险扇区管理、增加偏航减速机加强工装防止渗油、及时更换电磁抱闸等措施,减少及避免风机偏航减速机断齿损坏事件。

关键词：风电场偏航减速机偏航滑移扇区管理加强工装

Fast and Slow Responses of the North Pacific Mode Water and Subtropical Countercurrent to Global Warming

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2013年第2期12卷 216-221页

作者： XU Lixiao xie Shang-ping LIU Qinyu Physical Oceanography Laboratory and Key Laboratory of Ocean-Atmosphere Interaction and Climate in Universities of Shandong Ocean University of China Scripps Institution of Oceanography University of California at San DiegoLa JollaCA 92093-0230USA International Pacific Research Center and Department of Meteorology University of HawaiiHonoluluHI 96822USA

Six coupled general circulation models from the Coupled Model Intercomparison Project Phase 5 (CMIP5) are em-ployed for examining the full evolution of the North Pacific mode water and Subtropical Countercurrent (STCC) under global warming over 400 years following the Representative Concentration Pathways (RCP) 4.5. The mode water and STCC first show a sharp weakening trend when the radiative forcing increases, but then reverse to a slow strengthening trend of smaller magnitude after the radiative forcing is stablized. As the radiative forcing increases during the 21st century, the ocean warming is surface-intensified and decreases with depth, strengthening the upper ocean's stratification and becoming unfavorable for the mode water formation. Moving southward in the subtropical gyre, the shrinking mode water decelerates the STCC to the south. After the radiative forcing is stabilized in the 2070s, the subsequent warming is greater at the subsurface than at the sea surface, destabilizing the upper ocean and becoming favorable for the mode water formation. As a result, the mode water and STCC recover gradually after the radiative forc-ing is stabilized.

关键词： mode water STCC fast and slow response CMIP5 radiative forcing

Trends of Superoxide Dismutase and Soluble Protein of Aquatic Plants in Lakes of Different Trophic Levels in the Middle and Lower Reaches of the Yangtze River, China

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2009年第4期51卷 414-422页

作者： Ai-ping Wu Te Cao Shi-Kai Wu Le-Yi Ni ping xie Donghu Experimental Station of Lake Ecosystems The State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology the Chinese Academy of Sciences Wuhan 430072 China Ecology Department College of Bioscience and Biotechnology Hunan Agricultural University Changsha 410128 China Graduate University of the Wuhan Branch Chinese Academy of Sciences Wuhan 430072 China

A limnological study was carried out to determine the responses of superoxide dismutase （SOD） activities and soluble protein （SP） contents of 11 common aquatic plants to eutrophication stress. Field investigation in 12 lakes in the middle and lower reaches of the Yangtze River was carried out from March to September 2004. Our results indicated that non- submersed （emergent and floating-leafed） plants and submersed plants showed different responses to eutrophication stress. Both SOD activities of the non-submersed and submersed plants were negatively correlated with their SP contents （P 〈 0.000 1）. SP contents of non-submersed plants were significantly correlated with all nitrogen variables in the water （P 〈 0.05）, whereas SP contents of submersed plants were only significantly correlated with carbon variables as well as ammonium and Secchi depth （SD） in water （P 〈 0.05）. Only SOD activities of submersed plants were decreased with decline of SD in water （P 〈 0.001）. Our results indicate that the decline of SOD activities of submersed plants were mainly caused by light limitation, this showed a coincidence with the decline of macrophytes in eutrophic lakes, which might imply that the antioxidant system of the submersed plants were impaired under eutrophication stress.

关键词： eutrophication macrophytes soluble protein superoxide dismutase.

基于互联网医院医联体慢性伤口云端管理模式的应用研究

在线全文

学校读者我要写书评

暂无评论

现代临床护理 2024年第3期23卷 82-87页

作者：张在萍张薇谢萍汤雨佳江苏省苏北人民医院胆胰中心江苏扬州225001

目的探讨基于互联网医院医联体慢性伤口云端管理模式在医联体慢性伤口患者管理中的构建和应用效果。方法采用不同病例前-后对照研究,将2020年4月至2021年4月医联体就诊慢性伤口患者90例设为对照组,将2021年5月至2022年5月医联体就诊慢... 详细信息

目的探讨基于互联网医院医联体慢性伤口云端管理模式在医联体慢性伤口患者管理中的构建和应用效果。方法采用不同病例前-后对照研究,将2020年4月至2021年4月医联体就诊慢性伤口患者90例设为对照组,将2021年5月至2022年5月医联体就诊慢性伤口患者96例设为观察组。对照组给予常规伤口护理管理,观察组采用构建的互联网医院医联体慢性伤口云端管理模式,对10家医联体医院的患者进行全程同质管理。比较两组患者的伤口愈合率、患者满意度,转诊率和伤口愈合时间。结果观察组患者伤口愈合率、患者满意度均高于对照组,转诊率较对照组低,伤口愈合时间较对照组短,两组比较,差异具有统计学意义(均P<0.05)。结论基于互联网医院医联体慢性伤口云端管理模式的实施能缩短医联体慢性伤口患者伤口愈合时间,提高伤口愈合率、患者满意度,提高医联体医院慢性伤口护理质量,为实现医联体医院慢性伤口同质化护理目标打好基础。

关键词：互联网医院医联体云会诊慢性伤口云端管理模式前-后对照研究