检索结果-南通市图书馆

Photoperiod Mediates the Effects of Temperature and Light Intensity on the Proliferation of Ulva prolifera

Journal of Ocean University of China 2024年第1期23卷 255-263页

作者： jiang jianan YU Yanyan CHEN Yili LI Yahe XU Nianjun Key Laboratory of Marine Biotechnology of Zhejiang Province School of Marine SciencesNingbo UniversityNingbo 315211China

In order to study the complex effects of photoperiod,temperature,and light intensity on the spore maturation and release number of Ulva prolifera,we cultured thalli segment(2–3 mm)under three different photoperiods(L:D=12:12,14:10 and 10:14),temperature(15℃(LT),25℃(MT)and 30℃(HT))and light intensity(100,200 and 400μmol m^(−2)s^(−1),noted as LL,ML and HL,respectively)*** the maturation time,spore release number and chlorophyll fluorescence were *** results suggested that:1)The spore maturation time was accelerated by higher temperature or higher light intensity from 62 h to 36 h,and changes in day length accelerated the spore maturation to a certain extent as compared with 12:12 light/dark cycle;2)Higher light intensity significantly decreased the chlorophyll fluorescence(Fv′/Fm′,NPQ,rETRmax andα)of the mature reproductive segment under 30℃with 12:12 light/dark *** when in the other photoperiods(10:14 and 14:10 conditions),the inhibitory effects of high light intensity were alleviated significantly;3)The optimum condition for the spore maturation and release was 12:12 light/dark cycle,25℃,400μmol m^(−2)s^(−1),with both shorter and longer photoperiod reducing the spore release number;4)Higher light intensity significantly increased the spore release number under 25℃,but these effects were alleviated by 30℃*** study is the first attempt to elucidate the coincidence effects of photoperiod,temperature and light intensity on the reproduction of Ulva,which would help to reveal the mechanism of the rapid proliferation of green tide.

关键词： light intensity maturation photoperiod reproduction temperature Ulva prolifera

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于事故树的湿式自动喷水灭火系统可靠性分析

引用

黑龙江科学 2024年第2期15卷 125-127页

作者：姜佳男辽宁省鞍山市消防救援支队辽宁鞍山114000

湿式自动喷水灭火系统是有效的建筑消防设施,具有较高的灭火、控火能力,但在实际应用中常因系统失效、人员操作不当等导致其失效,无法有效扑灭火灾,故对湿式自动喷水灭火系统的可靠性进行研究。指出了湿式自动喷水灭火系统在实际应用中... 详细信息

湿式自动喷水灭火系统是有效的建筑消防设施,具有较高的灭火、控火能力,但在实际应用中常因系统失效、人员操作不当等导致其失效,无法有效扑灭火灾,故对湿式自动喷水灭火系统的可靠性进行研究。指出了湿式自动喷水灭火系统在实际应用中存在的问题,通过建立事故树对系统失效原因进行分析,提出提高湿式自动喷水灭火系统可靠性的措施。

关键词：湿式自动喷水灭火系统故障模式可靠性事故树

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

扩散焊参数对316L不锈钢微通道结构板片的焊接影响研究

引用

科技资讯 2024年第5期22卷 95-97页

作者：蒋健安杭州沈氏节能科技股份有限公司浙江杭州311612

基于高效紧凑扩散焊微通道热交换器领域,为了研究扩散焊接参数对微通道结构板片的焊接性能影响,从而保证扩散焊微通道热交换器的扩散焊接强度,对其在不同焊接压力曲线与保温时间下的样品性能进行了协同研究。结果表明:在升温至1 060℃时... 详细信息

基于高效紧凑扩散焊微通道热交换器领域,为了研究扩散焊接参数对微通道结构板片的焊接性能影响,从而保证扩散焊微通道热交换器的扩散焊接强度,对其在不同焊接压力曲线与保温时间下的样品性能进行了协同研究。结果表明:在升温至1 060℃时,保温80 min后进行一次焊接压力释放,将焊接压力由8 MPa降到2 MPa,然后再进行阶段性升压,并且升压速率控制在0.4 MPa/min及以下时,有助于增加微通道板片的焊接强度。

关键词：扩散焊接微通道结构 316L不锈钢升压速率

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

脐带挤推对剖宫产分娩新生儿出生后相关结局影响的meta分析

引用

中华围产医学杂志 2024年第3期27卷 177-187页

作者：陈世江陶伏莹付东英田莹莹傅洁蒋佳男南京医科大学附属妇产医院(南京市妇幼保健院)手术室南京210004

目的评价脐带挤推对剖宫产分娩新生儿出生后相关结局指标的影响。方法计算机检索中英文数据库(包括中国知网、万方医学数据库、中国生物医学文献数据库、维普数据库、中华医学期刊全文数据库、PubMed、Embase、CINAHL、Web Of Science、... 详细信息

目的评价脐带挤推对剖宫产分娩新生儿出生后相关结局指标的影响。方法计算机检索中英文数据库(包括中国知网、万方医学数据库、中国生物医学文献数据库、维普数据库、中华医学期刊全文数据库、PubMed、Embase、CINAHL、Web Of Science、the Cochrane Library、Google Scholar)及临床试验注册平台(***)中关于剖宫产分娩新生儿脐带挤推的随机对照研究,时间均从建库至2023年7月。纳入标准:研究类型为随机对照研究;研究对象为剖宫产分娩行脐带挤推后断脐的新生儿,种族不限;结局指标为出生后血红蛋白水平、红细胞压积、胆红素峰值、蓝光治疗、脐血pH值、脑室内出血、死亡、红细胞增多症、新生儿坏死性小肠结肠炎、Apgar评分;偏倚风险评估(risk of bias assessment tool 2.0)为低风险或可能存在风险。采用RevMan5.3进行meta分析,并根据新生儿的胎龄进行亚组分析。采用推荐分级的评价、制订与评估(grades of recommendations assessment,development,and evaluation,GRADE)系统进行证据质量评级。结果最终纳入11篇文献,共计2347例新生儿(包含足月儿1322例和早产儿1025例)。meta分析结果显示:(1)与立即断脐相比,脐带挤推能提高新生儿出生后24 h内血红蛋白水平(MD=1.40,95%CI:1.11~1.70,Z=9.32,P0.05);(2)与延迟脐带结扎相比,脐带挤推能提高新生儿出生后24 h内血红蛋白水平(MD=0.83,95%CI:0.75~0.91,Z=20.11,P0.05)。结论脐带挤推能提高剖宫产分娩新生儿出生后短期的血红蛋白和红细胞压积水平,可能有益于预防新生儿出生后短期内贫血,但对胆红素峰值、蓝光治疗、红细胞增多症等发生风险影响不大,亦未增加剖宫产分娩新生儿的不良结局。但仍需更多高质量、大样本的随机对照研究进一步证实。

关键词：结扎术脐带剖宫产术婴儿,新生 meta分析

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

An Efficient One-pot Synthesis of Aryl-substituted 1-(Thiazol-2-yl)-1H-pyrazole-3-carboxylates via a Hantzsch Synthesis-Knorr Reaction Sequence

引用

Chinese Journal of Chemistry 2014年第2期32卷 179-190页

作者： Chunhui Gu Jiaojiao Zhai jianan jiang Hongwei Liu Lei Wang Dunru Zhu Yafei Ji School of Pharmacy East China University of Science and TechnologyShanghai 200237China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemistry and Chemical EngineeringNanjing University of TechnologyNanjingJiangsu 210009China

The treatment ofα-bromoalkyl aryl ketones and 2-(propan-2-ylidene)hydrazine carbothioamide afforded 4-aryl-2-(2-(propan-2-ylidene)hydrazinyl)thiazoles via a Hantzsch-thiazole synthesis,which reacted with 4-aryl-2,4-diketoesters via a sequential Knorr-pyrazole reaction to deliver a variety of aryl-substituted ethyl 1-(thiazol-2-yl)-1Hpyrazole-3-carboxylates in a one-pot fashion with moderate to high *** key intermediates 4-aryl-2,4-diketoesters,existing as its enolic lithium salt,were synthesized in situ by a high-yield tert-BuOLi-mediated Claisen condensation of alkylphenones and diethyl *** class of elegant molecule comprises aryl groups on the two different heterocyclic cores,and the configurations of two representative molecules were determined by single crystal X-ray crystallography.

关键词： one-pot synthesis Claisen condensation Hantzsch synthesis Knorr reaction 1-(thiazol-2-yl)pyrazole-3-carboxylates

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Mitigating the Reconstruction of Metal Sulfides for Ultrastable Oxygen Evolution at High Current Density

引用

CCS Chemistry 2024年第1期6卷 137-148页

作者： Shuai Niu Tang Tang Yuanju Qu Yuyun Chen Hao Luo Hui Pan Wen-Jie jiang jianan Zhang Jin-Song Hu Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Molecular Nanostructure and NanotechnologyInstitute of ChemistryChinese Academy of SciencesBeijing 100190 Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacao SAR 999078 Department of Chemical Engineering University of MelbourneParkvilleVictoria 3010 College of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001 School of Chemical Sciences University of Chinese Academy of SciencesBeijing 100049 Dalian National Laboratory for Clean Energy Dalian 116023

Metal sulfides are emerging highly active electrocatalysts for the oxygen evolution reaction(OER),but still suffer from the instability caused by their inevitable reconstruction,especially at industrial-level current ***,it is discovered that Fe-incorporated Ni3S2 nanowires can deliver extraordinary durability with an ultralow potential degradation rate of 0.006 mV/h in alkaline electrolytes made with fresh water and seawater at a benchmark of 500 mA cm^(-2) while meeting the industrial activity requirement for overpotential less than 300 mV(290 mV).Systematic experiments and theoretical simulations suggest that after forming the S-doped NiFeOOH shell to boost intrinsic activity,Fe incorporation effectivelymitigates the reconstruction of the Ni_(3)S_(2) nanowire core by restraining Ni oxidation and S dissolution,justifying the *** work highlights the significance of circumventing reconstruction and provides a strategy to explore practical chalcogenides-based OER electrocatalysts.

关键词： oxygen evolution reaction sulfur-doped NiFeOOH NiFe sulfides nanowire ultrastable high current density

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A One-pot Approach to Ethyl 1,4,5-Triaryl-lH-pyrazole-3- carboxylates via an Improved Claisen Condensation- Knorr Reaction Sequence

引用

Chinese Journal of Chemistry 2013年第12期31卷 1526-1538页

作者： Jiaojiao Zhai Chunhui Gu jianan jiang Shunli Zhang Daohua Liao Lei Wang Dunru Zhu Yafei Ji School of Pharmacy East China University of Science and Technology Shanghai 200237 China State Key Laboratory of Materials-oriented Chemical Engineering College of Chemistry and Chemical Engineering Nanjing University of Technology Nanjing Jiangsu 210009 China

A one-pot approach to ethyl 1,4,5-triaryl-lH-pyrazole-3-carboxylates has been developed in moderate to high yields. The tert-BuOLi-mediated Claisen condensation of 1,2-diarylethanones and ethyl oxalyl chloride efficiently provided the enolized lithium salts of ethyl 2,4-dioxo-3,4-diarylbutanoates, which in situ reacted with arylhydrazine hydrochlorides via a hydrochloric acid-promoted Knorr reaction to produce the exquisite triarylpyrazole-3- carboxylates. The procedure promises a convenient access to this highly crowded framework for drug discovery.

关键词： one-pot approach 2,4-dioxo-3,4-diarylbutanoates Claisen condensation Knorr reaction triarylpyrazole-3-carboxylates

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Caudal hematopoietic tissue supports definitive erythrocytes via epoa and is dispensable for definitive neutrophils

引用

Journal of Genetics and Genomics 2024年第6期51卷 669-672页

作者： Zhujuan Huang Yongtai Xu Zhongkai Qiu Yunyun jiang Jiaye Wu Qing Lin Sicong He jianan Y.Qu Jiahao Chen Jin Xu Innovation Centre of Ministry of Education for Development and Diseases School of MedicineSouth China University of TechnologyGuangzhouGuangdong 510006China Department of Biology School of Life SciencesSouthern University of Science and TechnologyShenzhenGuangdong 518055China Department of Electronic and Computer Engineering The Hong Kong University of Science and TechnologyKowloonHongkong 999077China

The blood system originates from hematopoietic stem cells(HSCs),capable of self-renewal and differentiation,generating diverse blood cell types(Eaves,2015;Lucas,2021).The concept of the hematopoietic niche was first proposed in 1978(Schofield,1978),which is crucial for maintaining hematopoietic *** following studies,particularly in mammals,have utilized targeted genetic manipulation to identify and define these niches.

关键词： hematopoietic manipulation utilized

来源：

维普期刊数据库评论