检索结果-南通市图书馆

Bioactive Compounds and Insecticidal Activity of Hysterionica pinifolia, a Native South American Plant

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

American Journal of Plant Sciences 2022年第6期13卷 815-832页

作者： Ingrid M. Cufre lucas E. Fabián Sandra V. Clemente Arnaldo l. Bandoni Adriana M. Broussalis Facultad de Farmacia y Bioquímica Catedra de Farmacognosia Universidad de Buenos Aires Buenos Aires Argentina CONICET Instituto de la Química y Metabolismo del Fármaco (IQUIMEFA) Buenos Aires Argentina Facultad de Farmacia y Bioquímica Catedra de Química Medicinal Universidad de Buenos Aires Buenos Aires Argentina Facultad de Agronomía área de Producción Vegetal Orgánica Universidad de Buenos Aires Buenos Aires Argentina

Phytochemical investigation of the purified fractions of the active dichloromethane extract of Hysterionica pinifolia (Poir.) Baker led to the identification of five compounds. New acetylenic alcohol (E)-undec-3-en-5,7-diyne-1-ol (1) and three other compounds (3), (4), and (5) were reported for the first time in this species. Furthermore, forty-six components from the volatile fraction of H. pinifolia were identified. These compounds were elucidated using 1D and 2D NMR spectroscopy as well as MS-ESI and GC-FID-MS experiments. The dichloromethane extract, its fractions, and the methanolic extract were tested for insecticidal activity against Tribolium castaneum under laboratory conditions. The dichloromethane extract and the fraction F2 were found to be active, showing high larval mortality. The dichloromethane extract was also active against T. castaneum adults. The results have shown that H. pinifolia could be considered, in a near future, as a potential source for the development of a botanical insecticide for pest control.

关键词： Hysterionica pinifolia Bioactive Compounds Polyacetylene Compounds (E)-undec-3-en-5 7-diyne-1-ol Insecticidal Activity

Brain Metastases Treated with Radio surgery Alone:An Alternative to Whole Brain Radiotherapy?

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

癌症 2003年第7期22卷 784-784页

作者： Toshinori Hasegawa Douglas Kondziolka John C.Flickinger Anand Germanwala l.Dade lunsford M.D. M.D.M.Sc.F.R.C.S.(C)M.D.M.D.M.D.

OBJECTIVE:Whole brain radiotherapy(WBRT)provides benefit for patients with b rain metastases but may result in neurological toxicity for patien ts with extended survival *** reotactic radiosurgery in combination with WBRT has become an important approach,but the value of WBRT has been *** an alternative to WBRT,we managed patients with stereotactic radiosurgery alone,evaluated pati ents’outcomes,and assessed prognostic factors for survival and tumor c ***:One hundred seventy-two patients with b rain metastases were managed with ra diosurgery *** hundred twent y-one patients were evaluable with follow-up imaging after *** median patien t age was 60.5years(age range,16-86yr).The mean marginal tumor dose and volume were 18.5Gy (range,11-22Gy )and 4.4ml (range,0.1-24.9ml ).Eighty percent of patients had soli tary ***:The overall median survival time *** median survival time in patients with no evidence of primary tumor disease or stable disease was 13and *** local tumor contr ol rate was 87%.At 2years,the rate of local control,remote brain control,and total intr acranial control were 75%,41%,and 27%,*** multivariate a nalysis,advanced primary tumor status(P=0.0003),older age(P=0.008),lower Karnofsky Performance Scale score(P=0.01),and malignant melanoma (P=0.005)were significant for poorer surviva *** median survival time was 28mon ths for patients younger than 60years of age,with Karnofsky Performance Scale score o f at least 90,and whose primary tumor status showed either no evidence of disease or stable *** volume (P=0.02)alone was significant for local tumo r control,whereas no factor affecte d remote or intracranial tumor contr *** patients developed complica tions,six of which were ***(16.5%)of 116patients in whom the cause of death was obtained died as a result of cause s related to brain ***:Brain metastases were controlled

关键词：脑转移瘤局部放射外科治疗全脑放射疗法比较

Four-wave mixing with matter waves

在线全文

学校读者我要写书评

暂无评论

Four-wave mixing with matter waves

Sintering kinetics of Ni_2FeSb powder alloys produced by mechanical milling

CCAST“激光冷却：玻色—爱因斯坦凝聚和原子激射器”研讨会

作者： l.Deng E.W.Hagley J.Wen M.Trippenbach Y.Band P.S.Julienne J.E.Slmsarian K.Helmerson S.l.Rolston W.D.Phillips Atomic Physics Division National Institute of Standards and Technology GaithersburgMaryland 20899USA Department of PhysicsGeorgia Southern UniversityStateiboroGeorgia 30460USA Atomic Physics Division National Institute of Standards and TechnologyGaithersburgMaryland 20899USA Atomic Physics Division National Institute of Standards and Technology GaithersburgMaryland 20899USA Department of Chemistry and PhysicsBen-Gurion University of the NegevBeer-sheva 84105Israel

The advent of the laser as an intense source of coherent light gaverist to monlinear optics,which now plays an important role inmany areas of science and *** of the first applicationsof nonlinear optics was the multi-wave mixing of several opticalfields in a nonlinear medium(one in which the refractive indexdepends on the intensity of the field)to produce coherent light of anew *** recent experimental rcalization of the matter-wave ‘laser‘ —based on the extraction ol coherent atoms from aBost-Einstein condensate—opens th‘ way for analogous experi-ments with intense sources of matter waves:nonlinear *** we report coherent four-wave mixing in whichthree sodium matter waves of differing momenta mir to produce,by means of nonlinear atom-atom interactions,a fourth wavewith new *** find a clear signature of a four-wavemixing process in the dependence of the generated matter wave onthe densities of the input *** results may ultimatelyfacilitate the production and investigation of quantum correlationsbetween matter waves.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2016年第8期26卷 2126-2135页

作者： F.AlVARADO-HERNáNDEZ O.JIMéNEZ G.GONZAlEZ-CASTANEDA V.BAlTAZAR-HERNáNDEZ J.CABEZAS-VIllA M.AlBITER H.VERGARA-HERNáNDEZ l.olMOS Unidad Académica de Ingeniería I Universidad Autónoma de ZacatecasJardín Juárez 147 Centro Histórico Zacatecas Zacatecas C. P. 98000 México Departamento de Ingeniería de Proyectos CUCEI Universidad de GuadalajaraBlvd. Marcelino García Barragán 1421 Olímpica Guadalajara Jalisco C. P. 44430 Mexico INICIT Universidad Michoacana de San Nicolás de HidalgoFco. J. Mujica S/N C.U. Morelia Michoacán C. P. 58060 México División de Estudios de Posgrado e Investigación TecNM/Instituto Tecnológico de MoreliaAv. Tecnológico # 1500 Colonia Lomas de Santiaguito Morelia Michoacán C. P. 58120 México

A ternary Ni2FeSb shape memory alloy was fabricated by powder metallurgy route. Sintering kinetics was estimated from dilatometry tests; whereas the microstructure and morphology of the powder and consolidated bulk samples were evaluated by XRD and SEM, respectively. Microhardness tests were performed on the surface of sintered samples. The results indicated that milling time has an effect on the shape and particle size as well as the homogeneity of the crystalline structures of the powders. Samples with longer milling time presented higher relative densities, better distribution of the elements on the alloy as well as the l21 and martensite phases, which will give the shape memory effect. The estimated activation energy values ranged from 109 to 282 kJ/mol at temperatures between 750 and 1273 K, indicating that sintering is controlled mainly by volume diffusion. Microhardness was improved by increasing the milling time and the heating rate.

关键词： Ni-based shape memory alloy mechanical milling solid state sintering microhardness

含受阻胺结构的三嗪型光稳定剂的合成及性能研究

在线全文

学校读者我要写书评

暂无评论

石油化工 2011年第6期40卷 640-643页

作者：张宇邵玉昌刘威吕连海大连理工大学精细化工国家重点实验室辽宁大连116012 大连化工研究设计院辽宁大连116023

以2-[2-羟基-4-（乙氧基羰基）甲氧基苯基]-4，6-二芳基-1，3，5-三嗪为原料（1A和2A），分别与2，2，6，6-四甲基哌啶醇和1，2，2，6，6-五甲基哌啶醇进行酯交换反应，合成了4种含有2-[2-羟基-4-（甲酸哌啶酯基）甲氧基苯基]-4，6-二芳... 详细信息

以2-[2-羟基-4-（乙氧基羰基）甲氧基苯基]-4，6-二芳基-1，3，5-三嗪为原料（1A和2A），分别与2，2，6，6-四甲基哌啶醇和1，2，2，6，6-五甲基哌啶醇进行酯交换反应，合成了4种含有2-[2-羟基-4-（甲酸哌啶酯基）甲氧基苯基]-4，6-二芳基-1，3，5-三嗪结构的光稳定剂（1B，2B，3B，4B），收率分别为72％，68％，74％，66％；对光稳定剂进行了紫外吸收、热稳定性和光稳定性的测试。实验结果表明，在引入受阻胺基团后，光稳定剂的紫外吸收波长和摩尔消光系数未有明显变化；热稳定性略有降低；而光稳定性得到了增强，1B和2B在光老化20，30，40h后相对于其原料1A（取代基R1=R2=H）的分解率降低了3—4百分点，而3B和4B在光老化40h后相对于其原料2A（R1=H，R2=CH3）的分解率分别降低了4．88，3．06百分点。引入受阻胺基团的光稳定剂的光稳性得到了明显增强。

关键词：光稳定剂三嗪受阻胺紫外吸收剂自由基捕获剂

用Fura-2双波长荧光法测定低剂量电离辐射对小鼠脾细胞游离钙的影响

在线全文

学校读者我要写书评

暂无评论

白求恩医科大学学报 1999年第6期25卷 679-681页

作者：傅海青吕喆鞠桂芝卫生部放射生物实验室长春130021 卫生部放射生物重点实验室长春130021

目的：探讨低剂量电离辐射免疫增强效应的机理。方法：采用Ｆｕｒａ－２／ＡＭ双波长荧光测定法研究了低剂量电离辐射全身照射后小鼠脾Ｔ淋巴细胞内游离钙离子浓度（〔Ｃａ２＋〕ｉ）对次佳浓度ＣｏｎＡ（５ｍｇ／Ｌ）反应性的变... 详细信息

目的：探讨低剂量电离辐射免疫增强效应的机理。方法：采用Ｆｕｒａ－２／ＡＭ双波长荧光测定法研究了低剂量电离辐射全身照射后小鼠脾Ｔ淋巴细胞内游离钙离子浓度（〔Ｃａ２＋〕ｉ）对次佳浓度ＣｏｎＡ（５ｍｇ／Ｌ）反应性的变化。结果：静息状态下的小鼠脾淋巴细胞内游离钙离子浓度为９５．０±１４．０ｎｍｏｌ／Ｌ，ＣｏｎＡ可使小鼠脾Ｔ淋巴细胞内游离钙离子浓度增加６９．４±７．６ｎｍｏｌ／Ｌ，上升至峰值时间为７９．２ｓ。７５、１００和２００ｍＧｙ全身照射后２４ｈ，ＣｏｎＡ诱导的小鼠脾Ｔ淋巴细胞内游离钙离子动员明显高于假照射组（Ｐ＜０．０１）。结论：低剂量电离辐射的免疫兴奋效应与其增强淋巴细胞内〔Ｃａ２＋

关键词：低剂量电离辐射脾细胞 Fura-2/AM 钙离子

鸡蛋酱油原料熟制和制曲条件优化及挥发性成分分析

在线全文

学校读者我要写书评

暂无评论

中国食品学报 2023年第7期23卷 289-306页

作者：车莹褚彦钧田笑吕莹智秀娟仝其根北京农学院食品科学与工程学院北京102206 食品质量与安全北京实验室北京100022 蛋品安全生产与加工北京市工程研究中心北京100094

为开发鸡蛋酱油,采用米曲霉菌粉沪酿3.042制曲,利用单因素和响应面试验,优化鸡蛋酱油原料熟制和制曲的工艺条件,并通过GC-IMS方法分析鸡蛋酱油的挥发性有机化合物。结果表明,原料熟制的最佳条件为:熟料水分含量50%,熟制温度95℃,熟制时... 详细信息

为开发鸡蛋酱油,采用米曲霉菌粉沪酿3.042制曲,利用单因素和响应面试验,优化鸡蛋酱油原料熟制和制曲的工艺条件,并通过GC-IMS方法分析鸡蛋酱油的挥发性有机化合物。结果表明,原料熟制的最佳条件为:熟料水分含量50%,熟制温度95℃,熟制时间52 min,在该条件下得到成曲的中性蛋白酶活力为2 418.5 U/g干曲,感官评价81.9分。制曲的最佳条件为:环境湿度86%,制曲时间54 h,麦麸添加量32%,在该条件下得到成曲的中性蛋白酶活力为2 970.3 U/g干曲,感官评价为94.5分。GC-IMS分析结果表明,鸡蛋酱油中共鉴定出挥发性有机物87种,主要有酯类、醇类、酮类、醛类,与大豆酱油相比风味物质差异较大,其主要风味成分为1-戊烯-3-醇、2-己醇、2-甲基丁醇、2-戊醇、2,3-戊二酮、3-戊酮、2-甲基丁酸甲酯、乙酸戊酯、丙烯酸乙酯、丁酸甲酯、四氢呋喃、糠醛、己醛、反式-2-辛烯醛、丁酸等物质。试验结果表明,采用鸡蛋制作酱油曲是可行的,研究结果为后续制作鸡蛋酱油打下基础。

关键词：鸡蛋酱油工艺优化气相色谱-离子迁移谱挥发性有机化合物

2,3-二甲基-4-甲氧甲酰-2-环己烯醇的合成

在线全文

学校读者我要写书评

暂无评论

应用化学 2006年第5期23卷 548-551页

作者：胡炳成吕春绪张才南京理工大学化工学院南京210094 青海黎明化工有限责任公司技术中心

在碱性条件下,甲基甲氧甲酰环己烯酮(1)与碘甲烷经烷基化反应生成二甲基甲氧甲酰环己烯酮(2),通过选择性还原酮羰基制得目标产物二甲基甲氧甲酰环己烯醇(3),反应的总收率约为60%。研究了攫氢剂和还原剂对2步反应的影响,结果表明,烷基化... 详细信息

在碱性条件下,甲基甲氧甲酰环己烯酮(1)与碘甲烷经烷基化反应生成二甲基甲氧甲酰环己烯酮(2),通过选择性还原酮羰基制得目标产物二甲基甲氧甲酰环己烯醇(3),反应的总收率约为60%。研究了攫氢剂和还原剂对2步反应的影响,结果表明,烷基化反应和酮羰基选择性还原反应的最佳攫氢剂和还原剂分别是氢化钠和氢化三叔丁氧基铝锂,在二者作用下所得烷基化产物和还原产物的收率分别为90%和67%。合成产物的结构经元素分析、UV-V is1、H NMR、IR和MS得到了表征。

关键词：二甲基甲氧甲酰环己烯醇甲基甲氧甲酰环己烯酮二甲基甲氧甲酰环己烯酮氢化钠氢化三叔丁氧基铝锂

西花蓟马对二斑叶螨为害后番茄的行为反应及挥发物成分分析

在线全文

学校读者我要写书评

暂无评论

应用昆虫学报 2015年第4期52卷 968-976页

作者：温娟郅军锐吕召云李顺欣贵州大学昆虫研究所贵州省山地农业病虫害重点实验室贵阳550025

【目的】为明确二斑叶螨Tetranychus urticae为害番茄后诱导的防御反应对西花蓟马Frankliniella occidentalis行为的影响。【方法】采用四臂嗅觉仪测定了西花蓟马对二斑叶螨不同密度和时间为害后番茄植株的选择行为,并用气相色谱-质谱... 详细信息

【目的】为明确二斑叶螨Tetranychus urticae为害番茄后诱导的防御反应对西花蓟马Frankliniella occidentalis行为的影响。【方法】采用四臂嗅觉仪测定了西花蓟马对二斑叶螨不同密度和时间为害后番茄植株的选择行为,并用气相色谱-质谱联用仪测定了不同处理下番茄挥发物的成分,比较了它们的异同。【结果】西花蓟马对二斑叶螨不同为害株的选择率与为害时间和为害密度密切相关,并且西花蓟马对二斑叶螨为害程度居中的番茄喜好性强。10种不同处理番茄挥发性物质种类、含量及其比例在各处理间存在较大差异,二斑叶螨为害后诱导番茄新产生了香橙烯,并且在为害程度较高的番茄上检测到邻-异丙基苯、2-甲基-1-丁醇和(E)-2-己烯醛3种化合物。结合嗅觉仪的结果,推测间伞花烃和邻-异丙基苯对西花蓟马具有一定的驱避作用,对伞花烃和1-辛烯-3-醇对西花蓟马具有一定的引诱作用。【结论】西花蓟马对二斑叶螨为害程度居中的番茄植株有一定的偏好,二斑叶螨为害能诱导番茄挥发物种类和含量的变化,并且与螨害的密度和时间有关。

关键词：二斑叶螨西花蓟马番茄寄主选择挥发物