检索结果-南通市图书馆

Iron Mobilization and Mineralogical Alterations Induced by Iron-Deficient Cucumber Plants (Cucumis sativus L.) in a Calcareous Soil

引用

Pedosphere 2018年第1期28卷 59-69页

作者： Concetta Eliana GATTULLO Youry PII Ignazio ALLEGRETTA Luca MEDICI Stefano cesco Tanja MIMMO Roberto TERZANO Department of Soil Plant and Food Sciences University of Bari "Aldo Moro" Faculty of Science and Technology Free University of Bozen/Bolzano Institute of Methodologies for Environmental Analysis National Research Council of Italy (I.M.A.A.-C.N.R.)

Dicotyledons cope with ion(Fe) shortage by releasing low-molecular-weight organic compounds into the rhizosphere to mobilize Fe through reduction and complexation mechanisms. The effects induced by these root exudates on soil mineralogy and the connections between Fe mobilization and mineral weathering processes have not been completely clarified. In a batch experiment, we tested two different kinds of organic compounds commonly exuded by Fe-deficient plants, i.e., three organic acids(citrate, malate, and oxalate)and three flavonoids(rutin, quercetin, and genistein), alone or in combination, for their ability to mobilize Fe from a calcareous soil and modify its mineralogy. The effect of root exudates on soil mineralogy was assessed in vivo by cultivating Fe-deficient and Fe-sufficient cucumber plants(Cucumis sativus L.) in a RHIZOtest device. Mineralogical analyses were performed by X-ray powder diffraction. The batch experiment showed that citrate and, particularly, rutin(alone or combined with organic acids or genistein)promoted Fe mobilization from the soil. The combinations of rutin and organic acids modified the soil mineralogy by dissolving the amorphous fractions and promoting the formation of illite. These mineralogical alterations were significantly correlated with the amount of Fe mobilized from the soil. The RHIZOtest experiment revealed a drastic dissolution of amorphous components in the rhizosphere soil of Fe-deficient plants, possibly caused by the intense release of phenolics, amino acids, and organic acids, but without any formation of illite. Both batch and RHIZOtest experiments proved that exudates released by cucumber under Fe deficiency concurred to the rapid modification(on a day-scale) of the mineralogy of a calcareous soil.

关键词： flavonoids mineral weathering organic acids rhizosphere X-ray powder diffraction

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

Chilling Tendency and Chill of Cast Iron

引用

Tsinghua Science and Technology 2008年第2期13卷 177-183页

作者： E. fraé M. Górny W. Kapturkiewicz H. López AGH University of Science and Technology University of Wisconsin-Milwaukee

An analytical expression is presented for the susceptibility of liquid cast iron to solidify according to the Fe-C-X metastable system （also known as the chilling tendency of cast iron, CT）. The analysis incorporates the nucleation and growth processes associated with the eutectic transformation. The CT is related to the physicochemical state of the liquid, the eutectic cells in the flake graphite, and the number of nodules in nodular cast iron. In particular, the CT can be related to the critical wall thickness, Scr, or the chill width, Wcr, in wedge shaped castings. Finally, this work serves as a guide for understanding the effect of technical factors such as the melt chemistry, the spheroidizing and inoculation practice, and the holding time and temperature on the resultant CT and chill of the cast iron. Theoretical calculations of Sc, and Wc, compare well with experimental data for flake graphite and nodular cast iron.

关键词： chill chilling tendency gray cast iron nodular cast iron

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

N型创意屋

引用

建筑技艺 2009年第3期15卷 64-69页

作者： fra inc fra inc

该住宅位于日本青森县一块狭长的地块内，共分两层，占地面积34967平方米，建筑面积114.58平方米，总楼层面积194平方米，混凝土加木梁柱结构。在预算很低的情况下，设计师针对地块的特点，通过引入中间区域，将主要空间分开，在交叉口... 详细信息

该住宅位于日本青森县一块狭长的地块内，共分两层，占地面积34967平方米，建筑面积114.58平方米，总楼层面积194平方米，混凝土加木梁柱结构。在预算很低的情况下，设计师针对地块的特点，通过引入中间区域，将主要空间分开，在交叉口将空间切开，使整个空间变得透明与开放，被分开的空间变得具体有形。

关键词：创意 N型占地面积建筑面积梁柱结构青森县

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

氧化锑的毒性研究：——阻燃剂氧化锑和其它锑化合物对人和环境危害 …

引用

阻燃材料与技术 2000年第5期 12-15页

作者： Agena,D fra,PAG

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

RICERCHE NELLE TORBIERE DI ISEO(Brescia)

引用

Natural Disaster Reduction in China 1973年第1期 104-107页

作者： la REDAZIONE

A circa 20 Km da Brescia,in direzione NO,fra dne cerchie moreni-che stadiarie dai geologi riferite alla glaciazione icurmiana,èubicata laTorbiera di Iseo che,con i suoi 2 Km~2 di estensione,interessa geografica-mente... 详细信息

关键词： aglia 士一 Brescia 二止

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

法国Unimetal的新直流电弧炉

引用

冶钢译丛 1997年第2期 1-5页

作者： fra.,J－P 钟顺思

法国Ｇａｎｄｒａｎｇｅ的Ｕｎｉｍｅｔａｌ钢厂前不久安装了一台直流双壳电弧炉，其废钢料场物装料都适合于Ｕｎｉｍｅｔａｌ传统的订货手册，并在烟尘的排放和过滤方面作了巨大的努力。

关键词：炼钢直流电弧炉双壳炉

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

Novel opioid-neurotensin-based hybrid peptide with spinal long-lasting antinociceptive activity and a propensity to delay tolerance development

引用

Acta Pharmaceutica Sinica B 2020年第8期10卷 1440-1452页

作者： Karolina fra˛czek Mattia Ferraiolo Emmanuel Hermans Magdalena Bujalska-Zadrozny Kaja Kasarello Anna Erdei Kamila Kulik Agnieszka Kowalczyk Piotr Wojciechowski Dorota Sulejczak Piotr Sosnowski Sebastian Granica Sandor Benyhe Katarzyna Kaczynska Lukasz Nagraba Artur Stolarczyk Agnieszka Cudnoch-Jedrzejewska Patrycja Kleczkowska Department of Pharmacodynamics Centre for Preclinical Research(CBP)Medical University of WarsawWarsaw 02-097Poland laboratory of Neuropharmacology Institute of NeurosciencesUniversite´Catholique de LouvainBrussels B-1200Belgium Department of Experimental and Clinical Physiology Centre for Preclinical Research(CBP)Medical University of WarsawWarsaw 02-097Poland Institute of Biochemistry Biological Research CentreHungarian Academy of SciencesSzeged H-6701Hungary Doctoral School of Therotecical Medicine University of SzegedSzeged H-6720Hungary Department of Respiration Physiology Mossakowski Medical Research CentrePolish Academy of SciencesWarsaw 02-106Poland Department of Experimental Pharmacology Mossakowski Medical Research CenterPolish Academy of SciencesWarsaw 02-106Poland Department of Neuropeptides Mossakowski Medical Research CentrePolish Academy of SciencesWarsaw 02-106Poland Department of Pharmacognosy and Molecular Basis of Phytotherapy Faculty of PharmacyMedical University of WarsawWarsaw 02-097Poland Department of Orthopaedics and Rehabilitation Medical University of WarsawWarsaw 04-749Poland

The behavioral responses exerted by spinal administration of the opioid-neurotensin hybrid peptide, PK23, were studied in adult male rats. The antinociceptive effect upon exposure to a thermal stimulus, as well as tolerance development, was assessed in an acute pain model. The PK23 chimera at a dose of 10 nmol/rat produced a potent pain-relieving effect, especially after its intrathecal administration. Compared with intrathecal morphine, this novel compound was found to possess a favourable side effect profile characterized by a reduced scratch reflex, delayed development of analgesic tolerance or an absence of motor impairments when given in the same manner, though some animals died following barrel rotation as a result of its i.c.v. administration(in particular at doses higher than 10 nmol/rat). Nonetheless, these results suggest the potential use of hybrid compounds encompassing both opioid and neurotensin structural fragments in pain management. This highlights the enormous potential of synthetic neurotensin analogues as promising future analgesics.

关键词： opioid neurotensin doses

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

Only mothers feed mature offspring in European Ceratina bees

引用

Insect Science 2021年第5期28卷 1468-1481页

作者： Michael Mikat Jitka Waldhauserova Tereza frankova Katerina Cermakova Vojtech Broz Simon Zeman Marcela Dokulilova Jakub Straka Department of Zoology Faculty of ScienceCharles UniversityPragueCzech Republic Jihlava Grammar School JihlavaCzech Republic Department of Ecology Faculty of ScienceCharles UniversityPragueCzech Republic

Parental care directed to adult offspring is uncommon in *** parental care has been documented in Xylocopinae bees(Hymenoptera:Apidae).Moreover,some Ceratina bees(Xylocopinae)are known to feed mature siblings,and feeding of mature siblings is achieved by dwarf eldest daughters when mothers *** daughters are intentionally malnourished by mothers and usually originate from the first brood ***,we examined the pattern of care prov ided to young adults in three small European carpenter bees:Ceratina(Ceratina)cucurbitina,C.(Euceratina)chalybea,and C.(E.)*** of nest departures and arrivals were performed to study foraging *** detected intensive foraging behavior of mothers in all three studied ***,we did not observe regular foraging bchavior of daughters in any *** experimental removal of mothers in *** led to the emigration of young adults and did not initiate foraging activity in *** conclude that the feeding of siblings does not occur in these species unlike in the American species *** detected female-biased sex ratios in the first brood cell in *** and *** offspring in the first brood cell was smaller than other female offspring only in *** results show that a female-biased sex ratio and the small size of daughters in the first brood cell do not provide sufficient ev idence for demonstrating the existence of an altruistic daughter and also that the pattern of maternal investment is not exclusively shaped by social interactions.

关键词： foraging trip Hymenoptera maternal care provisioning sociality Xylocopinae

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

科尔泰斯的审世情怀

引用

戏剧（中央戏剧学院学报） 2020年第4期 59-68页

作者： [法]玛丽-克洛德·于贝尔吴亚菲(译) 埃克斯-马赛大学贵州师范大学瑞士研究中心

科尔泰斯不断地讲述疯狂产生的灾难,将谋杀置于作品的中心,捕捉死亡本能的各个方面,呈现乱伦、强奸、放火等各种形式的侵犯,以强调其摧毁力。其天才之处就在于恢复了在上世纪50年代新戏剧之后就被认为消失了的伟大悲剧。科尔泰斯带着审... 详细信息

科尔泰斯不断地讲述疯狂产生的灾难,将谋杀置于作品的中心,捕捉死亡本能的各个方面,呈现乱伦、强奸、放火等各种形式的侵犯,以强调其摧毁力。其天才之处就在于恢复了在上世纪50年代新戏剧之后就被认为消失了的伟大悲剧。科尔泰斯带着审世情怀看其周围的世界,一个欲望的法则取代了康德绝对命令1的混乱世界,每个人只想着支配别人,伤害至死;正是通过这样的审视科尔泰斯重新给与戏剧生气。

关键词：科尔泰斯法国20世纪戏剧疯狂死亡本能悲剧性

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

氙气诱导晚期在体心脏预适应：环氧化酶2的作用

引用

麻醉与镇痛 2009年第6期5卷 29-36页

作者： Nina C. Weber Jan fraβdorf Christoph Ratajczak Yvonne Grueber Wolfgang Schlack Markus W. Hollmann Benedikt Preckel 吴镜湘(译) 徐美英(校) laboratory of Experimental Intensive Care and Anesthesiology (L.E.I.C.A.) Academic Medical Center (A.M.C.) University of Amsterdam Amsterdam The Netherlands Department of Anesthesiology University Hospital Dusseldorf Germany 不详

背景氙气可诱导大鼠在体心脏的早期心肌预适应，但是否可诱导晚期心肌保护尚不知。环氧化酶2（COX-2）是介导心肌晚期缺血预适应（i-LPC）信号传导的重要介质之一。本文研究氙气是否可诱导晚期预适应（Xe—LPC）以及COX-2活性或表达是... 详细信息

背景氙气可诱导大鼠在体心脏的早期心肌预适应，但是否可诱导晚期心肌保护尚不知。环氧化酶2（COX-2）是介导心肌晚期缺血预适应（i-LPC）信号传导的重要介质之一。本文研究氙气是否可诱导晚期预适应（Xe—LPC）以及COX-2活性或表达是否介导了这种作用。方法雄性Wistar大鼠麻醉后置入冠状动脉阻断器。7天后动物随机分配到5个组，每组8只。i-LPC组通过阻断冠状动脉5分钟来诱发；Xe-LPC组通过吸入70％的氙气15分钟获得。其他大鼠用COX-2抑制剂NS-398（5mg·kg^-1，腹腔内注射）预处理，然后分别使用或不使用Xe-LPC。假手术组的动物不接受缺血预处理或氙气预处理，作为对照组。24小时后所有动物麻醉，收紧冠状动脉阻断器造成心肌缺血25分钟，继而开放再灌注2小时。TTC染色法测定心肌梗死面积。另外还在预处理后不同时间点取心脏，分别用PCR和Westernblot法检测COX-2mRNA及其蛋白表达。结果与对照组相比，缺血预处理组和氙气预处理组均可减少心肌梗死面积（所占百分比分别为：i-LPC组29％±7％，Xe—LPC31％±8％，与对照组比P均〈0．05，对照组为64％±6％）。NS-398可消除氙气诱导的心脏保护作用（该组为61％±6％，与Xe-LPC组比P〈0．05）。COX-2mRNA及其蛋白表达只在i-LPC组有所增加，Xe-LPC组无明显变化。结论氙气诱导晚期心肌预适应，这种作用可以被COX-2抑制剂消除，与缺血预适应相比，氙气诱导的预适应并不增加COX-2mRNA及其蛋白的表达。这一结果表明缺血预适应与氙气诱导的预适应在COX-2调节上存在差别。

关键词：心肌预适应晚期预适应环氧化酶2 在体心脏氙气 COX-2mRNA COX-2抑制剂 Westernblot法

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：