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direct precursor
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  直接前体
     Guanosine was the direct precursor of 5'-guanylic(5'-GMP), which was important in condiments industry. Improvement of the fermentation yield of guanosine had been a key-step that limited the development of condiments industry.
     鸟苷是生产呈味核苷酸 5’ -鸟苷酸的直接前体 ,其发酵法生产得率的提高已经成为限制呈味核苷酸工业发展的重要环节。
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  “direct precursor”译为未确定词的双语例句
     The blockage of pCPA was reversed by 5-hydroxytryptophan, the direct precursor of 5-HT.
     PCPA的作用可被5-羟色氨酸翻转。
短句来源
     After analysing and approving with the present materials, direct precursor in synthesizing LiNiO2 in aqueous solution by soft chemistry method are HNiO2-、Ni(OH)2and Ni3O4;
     结合现有的资料及理论分析,认为在水溶液中合成LiNiO2的直接前驱体为:HNiO2-、Ni(OH)2和Ni3O4;
短句来源
     ACC (0.1 mM), the direct precursor of ethylene, could also be used to induce seed germination, but germination rate was low (30%). Synergistic effect of light and ACC on germination of Pistia seed was obvious.
     ACC也能诱导水浮莲种子的萌发,0.1 mM浓度可获30%发芽率。
短句来源
  相似匹配句对
     Direct Steaming
     常规与双药物高温短时间触蒸工艺比较
短句来源
     Direct to Freedom
     走向自由
短句来源
     11 through the addition of its extra-direct precursor L-glutamic acid.
     11为试验菌进行L-脯氨酸的生物合成。
短句来源
     The blockage of pCPA was reversed by 5-hydroxytryptophan, the direct precursor of 5-HT.
     PCPA的作用可被5-羟色氨酸翻转。
短句来源
     Chemistry and Precursor Chemicals
     化学与易制毒化学品
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  direct precursor
The importance of localized plastic deformation on material properties, particularly as a direct precursor to failure, is emphasized.
      
Ketone 4b is a direct precursor of a homolog of the alkaloid ferruginine.
      
Phosphatidic acid has been shown to represent a direct precursor of other lipids.
      
By using an enzymic system, SF2 was demonstrated to be a direct precursor of SF1, being formed from riboflavin.
      
lubricipeda, but not their larvae, converted dietary 7(S)-heliotrine to 7(R)-heliotrine, a direct precursor of a male pheromone in some arctiids, 7(R)-hydroxydanaidal.
      
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Considerable controversy existed concerning the role played by central nor-epinephrine(NE)in acupuncture analgesia(AA).In this study the analgesiceffect of electroacupuncture(EA)in rats was measured by the tail flick latencyelicited by radiant heat.The content of central NE and its metabolic end-product3-methoxy-4-hydroxy-phenylglycol sulfate(MHPG.SO_4)in rats given EAwas determined with fluorospectrophotometry.A decrease of the NE content and a significant increase of the MHPG·SO_4content were found in both...

Considerable controversy existed concerning the role played by central nor-epinephrine(NE)in acupuncture analgesia(AA).In this study the analgesiceffect of electroacupuncture(EA)in rats was measured by the tail flick latencyelicited by radiant heat.The content of central NE and its metabolic end-product3-methoxy-4-hydroxy-phenylglycol sulfate(MHPG.SO_4)in rats given EAwas determined with fluorospectrophotometry.A decrease of the NE content and a significant increase of the MHPG·SO_4content were found in both brain and spinal cord of the rats under EA for 30minutes,suggesting an increased NE turn-over elicited by EA.The functional state of the central NE system was manipulated pharmacologi-cally-enhanced by injecting the direct precursor of NE,dihydroxyphenylserine(DOPS),or depressed by injecting α-or β-receptor blockers into the lateralventricles or the subarachnoid space of the spinal cord,and their influence on theanalgesic effect of EA was assessed.The results indicate that cerebral NE exhibiteda major antagonistic effect on AA via α-receptors as well as a minor facilitatoryeffect via β-receptors.On the contrary,NE in the spinal cord potentiated AAby activation of α-receptors.These findings may have some implications in clarify-ing the conflictions in the interpretation on the role of central NE in the mediationof AA.

中枢神经系统中的去甲肾上腺素(NE)对针刺镇痛究竟起增强或对抗作用,目前的看法还不一致。本工作观察了电针镇痛时大鼠脑和脊髓 NE 及其主要代谢产物3-甲氧基4-羟基苯乙二醇硫酸盐(MHPG·SO_4的含量变化。结果表明:电针刺激使脑和脊髓 NE 含量下降而MHPG·SO_4含量显著升高,提示脑和脊髓 NE 的更新加速。给大鼠脑室或脊髓蛛网膜下腔注射 NE 的直接前体二羟基苯丝氨酸(DOPS)来加强 NE 的功能,或注射α、β受体阻断剂来削弱 NE 的功能,从而观察其对电针镇痛作用的影响,结果表明脑和脊髓中的 NE 在电针镇痛中起着截然不同的作用;脑内 NE 主要通过α受体对抗电针镇痛,此外兼有较弱的通过β受体加强电针镇痛的作用,而脊髓内 NE 则是通过α受体来加强电针镇痛的作用。

Pistia seed is a light -favored seed. At least 42 h illumination of 300 lx was needed to break the dormancy completely. 8 h illumination gave low germination rate. In darkness, seeds could not be induced to germinate with GA_3 or BA, but could be induced to germinate with 0.1 nl/l ethylene. When 1,000 nl/l ethylene was applied, the percentage of germination was 80%, whereas 91% was observed under full light. ACC (0.1 mM), the direct precursor of ethylene, could also be used to induce seed germination,...

Pistia seed is a light -favored seed. At least 42 h illumination of 300 lx was needed to break the dormancy completely. 8 h illumination gave low germination rate. In darkness, seeds could not be induced to germinate with GA_3 or BA, but could be induced to germinate with 0.1 nl/l ethylene. When 1,000 nl/l ethylene was applied, the percentage of germination was 80%, whereas 91% was observed under full light. ACC (0.1 mM), the direct precursor of ethylene, could also be used to induce seed germination, but germination rate was low (30%). Synergistic effect of light and ACC on germination of Pistia seed was obvious. When 8 h-illumination and 0.1 mM ACC were applied separately, low percentages of germination were obtained. If they were used together, the percentage of germination was higher than the sum of percentage of separate treatments. When ACC was applied prior to the illumination, the percentage of germination was higher than that both were applied at the same time. It should be noted that at the initial stage of germination ACC was effective and the sensitivity of seeds to light enhanced. In the later stage of the germination, there were more events than the production of ethylene or ACC.

水浮莲种子是一种奇特的需光种子。在黑暗中,GA_2或BA均不能代替光照诱导萌发,可是0.1μl/l乙烯却能引起部分种子萌发,在1000μ1/1乙烯的作用下,发芽率可达80%,接近全光照处理的萌发水平(91%发芽率)。ACC也能诱导水浮莲种子的萌发,0.1 mM浓度可获30%发芽率。在较短光照下,ACC对种子萌发有增效作用。在光照前应用ACC,其诱导效应大于两者同时施用。在照光萌发中,种子的内源ACC含量及乙烯释放量均显著增加。CoCl_2和AOA均能抑制光的诱导萌发。推论光打破休眠诱导萌发的作用是与乙烯的生成密切相关。

In order to study whether 5-hydroxytryptamine (5-HT) plays a role in the physiologic regulation of blood glucose concentration, we used neuropharmacological methods to observe the relationship between central 5-HT metabolism and serum glucose level in 2-deoxyglucose (2-DG)-induced stress in mice. 2-DG (100 mg/kg, i. p.) produced significant hyperglycemia which reached its peak 90—120 min after injection. 60 and 120 min after 2-DG injection, the brain content of 5-HT was significantly increased When pargyline...

In order to study whether 5-hydroxytryptamine (5-HT) plays a role in the physiologic regulation of blood glucose concentration, we used neuropharmacological methods to observe the relationship between central 5-HT metabolism and serum glucose level in 2-deoxyglucose (2-DG)-induced stress in mice. 2-DG (100 mg/kg, i. p.) produced significant hyperglycemia which reached its peak 90—120 min after injection. 60 and 120 min after 2-DG injection, the brain content of 5-HT was significantly increased When pargyline was used to block the action of monoamine oxidase or probenecid used to block the transportation of 5-hydroxyinboleacetic acid (5-HIAA), the major metabolite of 5-HT, from the brain, 2-DG increased the synthesis and utilization of central 5-HT and accelerated the transport rate of 5-HIAA from the brain. In p-chlorophenylalanine (pCPA)-pretreated mice, the brain content of 5-HT was significantly decreased and did not change after the 2-DG injection; the serum glucose level also remained unchanged. The blockage of pCPA was reversed by 5-hydroxytryptophan, the direct precursor of 5-HT.

2-脱氧葡萄糖(2-DG,100mg/kg,i.p.)引起小鼠血糖升高的同时,使其脑内5-羟色胺含量增加。用优降宁和丙磺舒实验的结果表明,2-DG可以增加脑内5-HT的合成、利用以及加速5-HT的代谢产物5-HIAA向脑外的转运。在预先注射对氯苯丙氨酸(pCPA)的小鼠、脑内5-HT的含量在注射2-DG后不再增加,同时血糖也无明显上升。PCPA的作用可被5-羟色氨酸翻转。

 
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