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chemical constitution
相关语句
  化学组成
    Research progreses in chemical constitution,biosynthesis and metabolic pathways of plant disease resistive material are systematically reviewed in this paper.
    本文就近年来对植物抗病性物质的化学组成、生物合成、代谢途径方面的研究进行了综述。
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  “chemical constitution”译为未确定词的双语例句
    STUDY ON THE CHEMOTAXONOMY OF ARTEMISIA L. (COMPOSITAE) IN CHINA--The Correlation of Chemical Constitution of the Essential Oil wish the Plant Classification
    中国蒿属植物化学分类的初步研究——精油化学成分与系统分类的相关性
短句来源
    The relative vulnerability to streptomycin of the nervous structures is apparently conditioned by their chemical constitution.
    在各级结构中,神经细胞的化学合成决定它们反应链霉素的灵钝和轻重。
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  chemical constitution
The very lowQ can be explained by changes in the chemical constitution taking place in the uppermost mantle.
      
Since the properties of insulators are so strongly dependent on their crystallographic and chemical constitution the methods of film preparation determine to a considerable extend their characteristics.
      
The model is used to predict the effects of changes of bed voidage, physical properties, and chemical constitution of the sinter and the effects of gas and solids flow maldistribution on the operation of the furnace.
      
The chemical constitution of tribofilms, generated from zinc dialkyldithiophosphate (ZDDP) and ashless dialkyldithiophosphate (DDP), has been examined by X-ray Absorption Near Edge Structure (XANES) spectroscopy.
      
Chemical constitution of 3d complexes and rate constants of ortho-para positronium conversion reactions
      
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Thirteen adult guinea-pigs were divided into 3 groups:2 as normal controls;6 and 5 being treated with streptomycin sulphate 200 and 400mg per kilo body weight res- pectively for 21—60 days.The vestibular and auditory functions were tested.Their brains were prepared for Bielschowsky and Nissl sections.Microscopic examination re- vealed the following facts. Vascular disturbances prevail in the nervous system.The blood vessels are crumpled with concommittent perivascular edema.The adjacent nervous tissue shows...

Thirteen adult guinea-pigs were divided into 3 groups:2 as normal controls;6 and 5 being treated with streptomycin sulphate 200 and 400mg per kilo body weight res- pectively for 21—60 days.The vestibular and auditory functions were tested.Their brains were prepared for Bielschowsky and Nissl sections.Microscopic examination re- vealed the following facts. Vascular disturbances prevail in the nervous system.The blood vessels are crumpled with concommittent perivascular edema.The adjacent nervous tissue shows ischemic softening and the nerve fibres become demyelinated. The intoxicated nerve cells are generally dehydrated and shrunken often with eccen- tricity of nuclei and chromophilic lumps.Gliosis and neurophagosis are common. The vestibular and cochlear systems of the eighth or stato-acoustic nerve exhibit intoxicative changes in the 2 groups of animals.On the peripheral as well as the central side,the degeneration of the vestibular structures supercedes that of the cochlear system. The site and nature of the intoxication are much alike in the light and heavy-dose groups,yet the latter shows a higher severity. The degenerative alterations appear simultaneously in the perpheral and central struc- tures.A question of primacy in intoxication—peripheral or central—is not existent. There is a chain of structures on the peripheral and central sides of the stato-acoustic system;their degeneration does not proceed along the conduction path,nor the degree of intoxication varies with their relative positions on the conduction scale.The peri- pheral and central units get intoxicated independently. Besides the stato-acoustic structures streptomycin afflicts other sensory(e.g.trige- minal) and motor systems,the viscero-motor in particular.Streptomycin intoxication is general in nature,yet some structures are especially sensitive to it. The relative vulnerability to streptomycin of the nervous structures is apparently conditioned by their chemical constitution. Streptomycin injuries higher brain parts which are mainly motor,especially viscero- motor.The diencephalic viscero-motor nuclei,the striate complex and the visceral cor- tex are excessively disintegrated.The extensive intoxicative manifestations have a neurological basis. The toxin of streptomycin affects the entire nervous system and hence the whole bodily mechanisms.Its medical application calls for a meticulous consideration with respect to the patient's sensitivity to the antibiotic,the size of the dose and the length of the therapeutic course.

十三个成长的豚鼠分为三粗,2个作正常对照,此外6个和5个每日分别注射链霉秦硫酸盐,一公斤体重200和400毫克,共经21至60天。未了,豚鼠都经过平衡和听觉的测验。各脑分别染制Nissl和Bielschowsky切片。显微镜的检查得到以下的结果。神经系中普见血管的病变。血管塌陷,管外间质水肿。邻近的神经组织失血软化。神经纤维表现髓鞘溶解。中毒的神经细胞脱水萎缩,常见胞核偏位,染色质偏聚、结块。也时有神经胶质增生和神经吞噬现象。二组豚鼠在位听神经的前庭系和耳蜗系都有中毒的征象。在周缘部和中枢部,前庭系各极结构的病变,与耳蜗系相较,更为严重。在注射轻剂和重剂的二组豚鼠,神经系中毒的部位和性质是相似的,但重剂组的病变程度较高。在位听系,中毒的病变同时见于周缘部和中枢部。中毒的第一性的问题——在周缘, 抑在中枢——是不存在的。周缘和中枢各有一系结构,病变的表现不沿神经传导的路线;病变的轻重也不随路线上地位的高低。周缘和中枢的各项结构是各自中毒的。链霉素不仅毒害位听神经一系,而更损伤其它感觉系(如三叉神经系)和运动系——特是内脏运动系——的结构。链霉素中毒是一般性的,但有些结构特易感受它的毒害。在各级结构中,神经细胞的...

十三个成长的豚鼠分为三粗,2个作正常对照,此外6个和5个每日分别注射链霉秦硫酸盐,一公斤体重200和400毫克,共经21至60天。未了,豚鼠都经过平衡和听觉的测验。各脑分别染制Nissl和Bielschowsky切片。显微镜的检查得到以下的结果。神经系中普见血管的病变。血管塌陷,管外间质水肿。邻近的神经组织失血软化。神经纤维表现髓鞘溶解。中毒的神经细胞脱水萎缩,常见胞核偏位,染色质偏聚、结块。也时有神经胶质增生和神经吞噬现象。二组豚鼠在位听神经的前庭系和耳蜗系都有中毒的征象。在周缘部和中枢部,前庭系各极结构的病变,与耳蜗系相较,更为严重。在注射轻剂和重剂的二组豚鼠,神经系中毒的部位和性质是相似的,但重剂组的病变程度较高。在位听系,中毒的病变同时见于周缘部和中枢部。中毒的第一性的问题——在周缘, 抑在中枢——是不存在的。周缘和中枢各有一系结构,病变的表现不沿神经传导的路线;病变的轻重也不随路线上地位的高低。周缘和中枢的各项结构是各自中毒的。链霉素不仅毒害位听神经一系,而更损伤其它感觉系(如三叉神经系)和运动系——特是内脏运动系——的结构。链霉素中毒是一般性的,但有些结构特易感受它的毒害。在各级结构中,神经细胞的化学合成决定它们反应链霉素的灵钝和轻重。链霉素伤害高级的脑部,这多属运动性,特是内脏运动性。间脑的内脏性核团、纹状体簇和内脏性皮质中毒特别剧烈。链霉素中毒症状广泛,这是有神经基础的。链霉素的毒质伤害全神经系,也影响全身;为医疗使用这个抗菌素,关于患者对此药的敏感,剂量和疗程是要慎重考虑的。

Twenty-six species and eight varieties of Sect. Viscidipubes &. Sect. Albibractea are endemic to Asia. Most species of Sect. Viscidipubes are distributed from low to high altitudes and cold areas in the Hengduan-Himalayan Mountains, with only a few species extending to E or S Asia. Sect. Albibractea is distributed mainly in the subtropics and tropics, lower altitudes and moist areas in S & SE Asia, with a few species extending to the Qinling range of China. Both sections are more advanced than the other sections....

Twenty-six species and eight varieties of Sect. Viscidipubes &. Sect. Albibractea are endemic to Asia. Most species of Sect. Viscidipubes are distributed from low to high altitudes and cold areas in the Hengduan-Himalayan Mountains, with only a few species extending to E or S Asia. Sect. Albibractea is distributed mainly in the subtropics and tropics, lower altitudes and moist areas in S & SE Asia, with a few species extending to the Qinling range of China. Both sections are more advanced than the other sections. They were studied by cladistic analysis and outgroup comparison. Data matrix of 55 characters from stems, leaves, inflorescences, female flowers, bisexual flowers, achenes, pollen grains and chemical constitution was employed in separate and combined studies. Eighteen most parsimonious cladograms were generated with 358 steps,consistency index of 0. 72 and retention index of 0. 87.

菊科蒿属Artemisia的腺毛蒿组和白苞蒿组共有26种8变种,为亚洲特有植物。前者主产我国西南中、高海拔地区;后者主产秦岭以南横断山脉以东各省区的中、低海拔地区,少数种在亚洲南部、东南部也有分布。除泰国艾A.boreali-siamensis外,其余国内均产。它们在蒿属蒿亚属中进化程度较高,且与其它组有明显的区别。选择亲缘关系最近的艾组为外类群。在外类群比较原则和形态演化原则的基础上,对大量性状进行分析,包括茎、叶、花序、雌花、两性花和瘦果等性状,加之花粉形态、化学成分等,构成由55个性状演化系列组成数据矩阵,使用程序Hennig 86,version1.5在微机上运算,得到最简约的分支图。结论如下:(1)分支图表明:腺毛蒿组和白苞蒿组各为一单系类群,且互为姐妹关系。(2)经谱系分支分析,获得该类群修正的分类系统。分析结果支持林有润(1992,1991,1982)将中国腺毛蒿组分为腺毛蒿系、二郎山蒿系、多花蒿系及白苞蒿组分为白苞蒿系、垂叶蒿系和奇蒿系的观点,但少数种的位置有所变化,如白苞蒿组侧蒿A.deversa、腺毛蒿组吉塘蒿A.gyitangensis、泰国艾A.boreali-siamensis、察隅...

菊科蒿属Artemisia的腺毛蒿组和白苞蒿组共有26种8变种,为亚洲特有植物。前者主产我国西南中、高海拔地区;后者主产秦岭以南横断山脉以东各省区的中、低海拔地区,少数种在亚洲南部、东南部也有分布。除泰国艾A.boreali-siamensis外,其余国内均产。它们在蒿属蒿亚属中进化程度较高,且与其它组有明显的区别。选择亲缘关系最近的艾组为外类群。在外类群比较原则和形态演化原则的基础上,对大量性状进行分析,包括茎、叶、花序、雌花、两性花和瘦果等性状,加之花粉形态、化学成分等,构成由55个性状演化系列组成数据矩阵,使用程序Hennig 86,version1.5在微机上运算,得到最简约的分支图。结论如下:(1)分支图表明:腺毛蒿组和白苞蒿组各为一单系类群,且互为姐妹关系。(2)经谱系分支分析,获得该类群修正的分类系统。分析结果支持林有润(1992,1991,1982)将中国腺毛蒿组分为腺毛蒿系、二郎山蒿系、多花蒿系及白苞蒿组分为白苞蒿系、垂叶蒿系和奇蒿系的观点,但少数种的位置有所变化,如白苞蒿组侧蒿A.deversa、腺毛蒿组吉塘蒿A.gyitangensis、泰国艾A.boreali-siamensis、察隅蒿A.zayuensis和亚东蒿A.yadongensis。另建议将甘青蒿A.tangutica从腺毛蒿系分出,独立为甘青蒿系Ser.Tanguticae.(3)我国西南地区是该类群植物?

Plant disease resistive material,which includes phytoanticipins and phytoalexins,can be produced through the interaction between plants and pathogens. Research progreses in chemical constitution,biosynthesis and metabolic pathways of plant disease resistive material are systematically reviewed in this paper.

植物与病原菌相互作用后在植物体内会产生抗性物质。植物的抗病性物质包括两大类 :植物固有的抗菌物质和植物保卫素。本文就近年来对植物抗病性物质的化学组成、生物合成、代谢途径方面的研究进行了综述。

 
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