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chemical constituent     
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  化学成分
     The main chemical constituent was 1.2-2.2 C%, 2.0-3.2 Si%, the type of Sx was Sx_1-Sx_8,the quantity added into molten iron was 0-1.8%.
     本次试验选取的主要化学成分范围为1.2-2.2 C%,2.0-3.2 Si%; 变质剂种类为Sx_1-Sx_8;
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     1.Recension of Water Mensuration for Chinese Pharmacopoeia Appendix__ 2.Chemical Constituent from Epimedium Wushanense and Recension of Content Determination Criterion of Herba Epimedii for the People's Republic of China Pharmacopoeia
     1.中国药典附录___水分测定法修订 2.巫山淫羊藿化学成分研究及中国药典淫羊藿含量测定项标准修订
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     Objective : To investigate chemical constituent of butanol exaction of Rhodiola crenulata (Hook. f. et. Thoms). S. H. Fu from Yunnan ,meanwhile to explore the exaction method and Determination of the major effectiveness ingredients—Salidroside and Tyrosol in Rhodiola crenulata (Hook, f. et. Thoms).
     目的:对云南产大花红景天(Rhodiola crenulata(Hook.f.et.Thoms).S.H.Fu)植物正丁醇提取物进行化学成分的研究,探讨大花红景天主要功效成分红景天苷和酪醇提取方法并对含量测定方法进行研究。
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     Analysis of chemical constituent in defensive secretions of Tenebrio molitor by GC/MS
     黄粉虫防御性分泌物化学成分的GC/MS分析
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     The chemical constituent of pepper was extracted by SFE,and the best conditions were: extraction time is 1 hour,temperature is 45℃,pressure is 33Mpa.
     本文研究超临界CO2对花椒化学成分的萃取,并通过正交实验确定最佳工艺条件为:萃取时间1.0h,温度45℃,压力33MPa,并探讨了夹带剂对萃取结果的影响。
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  化学成份
     Discovery of Cytotoxic Chemical Constituent from Microorganism Metabolites
     从微生物代谢产物中发现具有细胞毒活性的化学成份
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     THE ANALYSIS OF CHEMICAL CONSTITUENT OF ONCOMELANIA SNAIL IN HUPEI
     湖北Oncomelania屬钉螺的化学成份分析
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     Studies on Chemical Constituent of Anemone Altaica C,A.May(Ⅱ)
     九节菖蒲化学成份研究(Ⅱ)
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  化学组分
     Main Chemical Constituent of the Yellow River Water and Characteristics of δ~(13)C Streamwise Variation
     黄河水主要化学组分与δ~(13)C的沿程变化特征
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     In the conditions of field and natural light,the effect of enhanced UV-B radiation on the chemical constituent and transformation of wheat seeds,such as soluble sugar,starch,lysine and protein have been investigated.
     在自然光照射条件下 ,研究了UV B辐射增强对小麦籽粒中可溶性糖、淀粉、赖氨酸、蛋白质等化学组分及其相互转化的影响 .
短句来源
     The paper comprehensively analyzes the main chemical constituent content of the Yellow River water and characteristic of isotope streamwise variation based on samples of the Yellow River,groundwater and surface water systematically collected from 17 valley sections from the river head to river mouth and the observation of its main chemical constituent content and δ~(13)C isotope component.
     在系统采集从黄河源头至入海口的17条河谷断面上的黄河水、地下水和地表水水样,并测定其主要化学组分含量和1δ3C同位素组成的基础上,对黄河水主要化学组分含量及同位素组成沿程变化特征进行了综合分析。
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     Basing upon a study on the material composition of phosphorus ore in Yunnan, China and all over the world, the correlation between the chemical constituent of industrial phosphorus ore and the chemical composition of mineral in China and abroad is exposed and a quantitative mathematical model of the main chemical constituent in an industrial phosphorus ore is set up.
     深入研究云南、中国及世界各地磷矿石物质成分基础上,揭示中外工业磷矿石化学组分与矿物化学组成的对应关系,建立工业磷矿石中主要化学组分含量之间函数定量数学模型。
短句来源
     From the results of hydrochemistry and isotope analysis,it can be seen that the groundwater runoff condition and the water alternate condition is relative bad,the dissolution or precipitation and evaporation has great contribution to the formation of each groundwater chemical constituent and the main source of water in this area is precipitation water and ice-snow molten water.
     水化学、同位素分析表明,该区地下水径流条件较差,水交替性弱; 溶滤作用和蒸发作用对于该区地下水中各化学组分的形成有较大的贡献;
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  “chemical constituent”译为未确定词的双语例句
     Application of Supercritical-CO_2 Fluid Extraction Technology on the Chemical Constituent Study of Artemisia annua
     超临界CO_2萃取技术在黄花蒿成分研究中的应用
短句来源
     Methods A chemical constituent was isolated by silica,polyamide,Sephadex LH-20 column chromatography and preparative HPLC.
     方法通过硅胶柱色谱、聚酰胺柱色谱、Sephadex LH 20和制备HPLC等手段分离,利用理化性质和光谱方法鉴定。
短句来源
     A survey of 18Mn2CrMoB(A (GC-11) steel application in aircraft F-7 M has been made. The analysis of chemical constituent and mechanical properties, com parision of its behaviour with those of 30CrMnSiA steel and valuation of its trial application in aircraft F-7M are listed. Lhe results and analysis shows a prospect of futher extended application of G C-11steel.
     通过对18Mn2Cr MoB A(GC-11)钢的成分、性能的分析,与30CrMnSiA钢的对比以及在歼七Ⅱ飞机上试用结果,指出GC-11钢在歼七Ⅱ飞机上进一步扩大应用的前景。
短句来源
     30 compositions were identified,amounting to 94.45% and 89.73% of the total area of the peaks respectively. Terpene is the major chemical constituent in the volatile oil.
     鉴定的30种组分的含量各占其总峰面积的94.45%和89.73%,主要以萜烯类为主。
短句来源
     The GC-MS have been used detecting the chemical constituent and the structure of the extracts of two raw materials, there are 26 entries compound have been confirmed in Wild Siris extract.
     用GC-MS检测并确定了山槐提取物中26个化合物及其化学结构。
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  chemical constituent
WithaferinA, a major chemical constituent of Withania somnifera, reportedly shows cytotoxicity in a variety of tumor cell lines while its molecular mechanisms of action are not fully understood.
      
Recovery of the one and two dimensional windfields from chemical constituent observations using the constituent transport equati
      
Excess sodium is the chemical constituent necessary for ordering to proceed at a relatively rapid rate; this rate seems to vary with the ratio aNa+/aH+, and hence with the peralkalinity of the aqueous fluid attending recrystallization.
      
Calibrations were developed for each chemical constituent using the NIR spectra, wood chemistry data and partial least squares (PLS) regression.
      
Temporal variations of temperature of the thermopause, total density and major chemical constituent density are reviewed and compared to the DTM94, DTM78 and MSIS86 models.
      
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Clay particles of less than 1μ were separated from 18 selected soil samples, representing important types of red and yellow soils of southern China.Com- position of clay minerals was identified by X-ray defraction,differential ther- mal analysis,base exchange capacity and chemical constituents.Zonality of the weathering stage of the soil,as shown in Fig.I,is explained briefly as follows. Region(Ⅰ)Lateritic soils Representative clay minerals:Kaolinite-gibbsite-hematite.Soils of this type mainly distribute...

Clay particles of less than 1μ were separated from 18 selected soil samples, representing important types of red and yellow soils of southern China.Com- position of clay minerals was identified by X-ray defraction,differential ther- mal analysis,base exchange capacity and chemical constituents.Zonality of the weathering stage of the soil,as shown in Fig.I,is explained briefly as follows. Region(Ⅰ)Lateritic soils Representative clay minerals:Kaolinite-gibbsite-hematite.Soils of this type mainly distribute on the rolling hills of northern Hainan island,Laichou peninsula and south-central Yunnan.Formation of lateritic soil seems confined to the highly weathered parent materials of basalt origin,which were formed possibly at tertial geological age.Present direction of soil development remains much controversy. The whole soil contains around 20% Fe_2O_3 as hematite.Clay portions (<1μ)of the soil possess base exchange capacity 5—5.5 m.e.per 100 grams and SiO_2/Al_2O_3 ratio 1.4—1.5. TiO_2 in form of ilmenite presents both in silt and clay fractions up to 4—6%. Region(Ⅱ)Red soils of tropic zone Representative clay minerals:Kaolinite-halloysite.Soils of this type form a narrow belt in the tropic zone,extending from southern Fukien to Kwangsi. They are derived from various parent materials,including granite,metamor- phic rocks,sand stones,shales and marine deposits.Clay minerals of kaolinite group are the characteristic weathering product of this soil type with minor portions of gibbsite,hematite,quartz,and illite. Clay fractions of this soft type possess base exchange capacity 10—15 m.e. per 100 grams and SiO_3/Al_2O_3 ratio 1.7—2.0. Region(Ⅲ)Red soils of subtropic zone Representative clay minerals:Kaolinite-quartz-Montmorillonite.Soils of this type distribute in the subtropic zone of south-cntral China,occurring on the low hills and terraces below 500—600 meters altitude.They are derived from granite,phyllite,sandstones,shales and red clay.The much higher ex- change capacity of clay fraction(20—25 m.e.per 100 grams),higher SiO_2/Al_O_3 ratio(2.0—2.3),together with the identified clay minerals characterize the less advanced weathering stage in comparison to the soils of tropic zone. In the silt fraction of this soil type much of orthoclass and mica remain undecomposed. Region(Ⅳ)Yellow soils on the mountainous region of southern China Representative clay minerals.Kaolinite-montmorillonite,Illitequartz and montmorillonite-quartz. On the higher mountains above 600—700 meters altitude of southern China, including both tropic and subtropic zones,yellow soils and partially red soils occur.Clay minerals of this soil type characterize a moderately weathering stage.Montmorillonite,illite,kaolinite and quartz are the major constituents, but variations of the composition of these minerals are determined by the primary minerals of their parent rocks. Clay fractions of this soil type possess base exchange capacity 24—34 m.e. per 100 grams,with higher content of active alumina up to 2.5—5.5 m.e.per 100 grams. Soils occurring on the depression area of red earth region usually appear yellowish.The diversity of soil color leads much controversies in soil classifi- cation.Present investigation indicates that the change from reddish coloration to yellowish in the depression area is induced by the hydration of hematite. Once a small portion of the anhydrous ferric oxide has been hydrated into geothite or limonite due to local variation of the moisture condition,while the main constituents of the clay minerals remain unchanged,the soil gives a dis- tinctive yellowish coating.The change is very sensitive.

1.用 X-光分析,差热分析,化学分析和代换量测定方法,综合鉴定了华南砖红壤性红壤,热带红壤,亚热带红壤和山地黄壤的粘土矿物组成,并绘制了华南土壤主要粘土矿物组成分区图。我们将华南土壤分为四个区,即砖红壤性红壤区,主要粘土矿物为高岭石,三水铝石,赤铁矿;热带红壤区,主要粘土矿物为高岭石,埃洛石;亚热带红壤区以高岭石,石英,濛脱石为主;山地黄壤区,以伊利石,濛脱石,石英,高岭石为主,其组合因母岩的不同而转移。2.我们对微域地形,如坡上、坡下;南坡、北坡和局部气候的影响,使土壤颜色发生了显著的变化的红色,黄色土壤进行了研究。结果证明,二者的化学性质、粘土矿物组成完全相同。在低洼地区和阳坡等湿润条件下赤铁矿部分水化成为针铁矿,因之使土壤颜色变黄。但这种黄色土壤与风化程度较浅的山地黄壤是有很大区别的。3.我们把由浅海沉积物母岩发育,过去称为砖红壤性红黄色土的土壤,划归红壤。因为我们研究结果证明,这类土壤的风化程度并不比红壤深些,它们的粘士矿物组成和化学性质与热带地区的红壤也很一致。砖红壤性土壤,仅仅局限于一定的母岩。4.在紫红色砂岩发育的山地黄壤中发现了一水软铝石的存在,对它的生成、转变尚待进一步研究。

The present paper is a review of the experimental results of current researches concerning foodpreferences and nutrition of plant-feeding insects. Stress has been laid on the roles played by the sensory discriminations and nutritional requirements in the selection of host plants. The effectivevisual, olfactory, tactile and gustatory stimuli emitted from plants may be classified as attractive orrepulsive for insects during food-finding and phagostimulative or phagoinhibitive for insects duringfeeding. The same...

The present paper is a review of the experimental results of current researches concerning foodpreferences and nutrition of plant-feeding insects. Stress has been laid on the roles played by the sensory discriminations and nutritional requirements in the selection of host plants. The effectivevisual, olfactory, tactile and gustatory stimuli emitted from plants may be classified as attractive orrepulsive for insects during food-finding and phagostimulative or phagoinhibitive for insects duringfeeding. The same may be applied to oviposition of the adult females whose offspring will feedon the same plant where they lay their eggs. Descriptions are given for the nature of the varioussensory stimuli and the characteristics of responses of different insects. In establishing nutritionalrelations with their host plants phytophagous insects of various food habits conceived as oligopha-gous, polyphagous, etc. perhaps all may subject to the action of favourable as well as unfavourablestimuli. Sometimes these two categories of stimuli may not be confined to the 'odd' substances ofplant origin, as revealed by the fact that some species have been reared successfully with artificialmedia of purified chemicals. Since food preferences may imply the possibility of maintenance of a population of an insect ona particular plant species, the roles played by nutritional requirements and the capacities of fooddigestion and utilization and of tolerating or omitting detrimental actions of toxic substances inplants are also important factors. These are the manifestations of the metabolic peculiarities ofdifferent insect species and different individuals of the same species. Although there are manysimilarities in the nutritional requirements of the phytophagous species so far studied, one cannotdisregard the functional adaptation in the differential utilization of the chemical constituents ofplants. Viewing the facts that nutrients such as sugars and amino acids may be used as phagostimu-lants and that the genral nutritional condition of the insect may also affect the threshold ofsensory perception and the frequency of occurrence of dispersal movements which may lead to thechange of the relation with the host plant or the location of feeding, one may agree to the genera-lization that thee are relations between host specificity and nutrition. Various theories concerning the causes of host specificity are examined and discussed.

本文综述和讨论近年来有关植食性昆虫食性和营养的研究结果和发展。第一部分略述该类昆虫食物因理化性质的各异所引起的食性特化现象,由此所产生的研究课题和国际对这方面的研究动态。第二部分叙述昆虫的感觉作用和食料植物选择之间的关系,列举对不同昆虫在觅食或产卵时有诱致或驱斥效应的和在取食时有助长或抑制效应的感觉刺激的本质和昆虫反应的特点。第三部分讨论植食性昆虫的营养和代谢的特点及其与食性特化的关系,在列举较近期间的研究成就后指出在不同种类中所存在着的营养差异,可能和食性特化有某些联系。这类昆虫的营养需要和对植物中有毒物质的适应都是代谢类型的反映,它们和昆虫的感觉反应有一定的联系,在与植物建立营养的关系中同样是重要的。第四部分叙述并讨论了有关植食性昆虫食性的某些理论,其中包括在选择食物中的机制、食性形成的主导因素、对食性类型以及食性演化的解释等。最后,指出对有关方面研究的可能进展和成就,及其在昆虫学各方面所起的影响。

The present work is a part of the chemical investigations on the essential oils of Lauraceae family from Yunnan, and only the chemical constituents of Cinnamomum glanduliferum Meissn and Cinnamomum bodinieri Levl are reported here. C. glanduliferum Meissn is widely distributed in the northern part of Yunnan. The essential oils derived from this camphor tree appear to be quite different in properties and compositions, according to different localities where the samples are collected. The chemical...

The present work is a part of the chemical investigations on the essential oils of Lauraceae family from Yunnan, and only the chemical constituents of Cinnamomum glanduliferum Meissn and Cinnamomum bodinieri Levl are reported here. C. glanduliferum Meissn is widely distributed in the northern part of Yunnan. The essential oils derived from this camphor tree appear to be quite different in properties and compositions, according to different localities where the samples are collected. The chemical constituents listed here are the work done on an essential oil derived from a species collected at Koutung, Song-ming, Yunnan. Yield of oil (from fresh leaves) 0.5%; d_(25)~(25) 0.8890; n_D~(25) 1.4732; [α]_D~(25) -19.15°; aldehyde and ketone content (bisulphite method) 27.2%. The following compounds have been identified in the oil: camphene, α-pinene, p-cymene, linalool, α-terpineol, d-camphor, citral, n-decylaldehyde, methylheptenone, cineole, and eugenol. The essential oils derived from C. bodinieri Levl have been observed to be several different types of constituents in the authors' laboratory. The present report is the findings on an essential oil, which chiefly consists of safrole. Yield of oil (from stem) 0.53—1.7%; d_(25)~(25) 1.0700; n_D~(25) 1.5275; [α]_D~(25)-0.85°; safrole content 84%. The chemical compounds besides safrole are camphene, α-pinene, dl-limonene, linalool, (α-terpineol, d-camphor, citral, methylheptenone, cineole, eugenol, and a sesquiterpene of the cadalene series.

云南樟(Cinnamomum glanduliferum Meissn)在云南北部分布較广,有若干小品种,其化学成分頗有差异。本文报告果东产的云南樟叶油的化学成分,証明含有莰烯、α-蒎烯、聚繖花素、芳樟醇、α-松油醇、樟脑、檸檬醛、癸醛、甲基庚烯酮、桉油素及丁香酚。猴樟(Cinnamomum bodinieri Levl)的精油化学成分亦有几种不同的类型,本文报告是以含黄樟油素为主的干油成分。此油含黄樟油素84%,其他成分尚有莰烯、α-蒎烯、檸檬烯、芳樟醇、α-松油醇、樟脑、檸檬醛、甲基庚烯酮、桉油素、丁香酚及苄系倍半萜等。

 
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