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no oxygen
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  无氧
     Remaining rates of the inclusion compound of β-carotene with β-cyclodextrin after 14 days were higher than uninclused β-carotene by 25.5%, 23.9%, and 20.5% under ambient,no light and air flowing, illuminating and no oxygen environment respectively.
     在自然放置、避光通气、光照无氧条件下14天后14天后β-胡萝卜素-β环糊精包合物的保留率明显高于未经包合的β-胡萝卜素,保留率分别提高了25.5%、23.9%、20.5%。
短句来源
     Microcomputer Control System for No Oxygen Copper Rod Furnace
     无氧铜杆炉微机控制系统
短句来源
     Maximal sulfur capacity of desulfurizer reaches 32.5% under the middle temperature and no oxygen.
     此脱硫剂在中温、无氧条件下脱硫,硫容可达32.5%.
短句来源
     The self tuning PID control of a no oxygen copper rod furnace
     无氧铜杆炉温的自校正PID控制
短句来源
     Key technologies such as no oxygen epitaxia1 surface etc. are reported for manufacturing SiGe/Si by MBE,with which both intrinsic and doping Si1-xGex/Si have been realised.
     介绍了用MBE法生长SiGe/Si新材料的无氧外延表面等关键技术,并据此外延生长出本征和掺杂Si1-xGex/Si材料。
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  “no oxygen”译为未确定词的双语例句
     The element analysis of HG-1 indicated that the ratio of C, N, H was 1:1:1 in HG-1, and there was no oxygen element;
     对HG-1组分进行元素分析,结果显示该物质中C、N、H比例约为1:1:1,不含有氧原子;
短句来源
     Failure analysis of no oxygen coming out of 150m 3/h oxygen plant and solutions
     150m~3/h制氧机不出氧的故障分析与处理
短句来源
     In ladle furnace (No oxygen jet equipment),the ultra-low-carbon stainless steel castings(C≤0.03%,minimum carbon content up to 0.019%) used in the Huanghe Wanjazhai water power station had beed produced for the first time by the steelmaking technique of oxygen blast +VD processes.
     在钢包炉中 (无氧枪设备条件下 ) ,首次采用吹氧 + VD(真空精炼 )法冶炼工艺 ,生产用于黄河万家寨电站水轮机铸件的超低碳不锈钢 (C≤ 0 .0 3% ,最低达到 0 .0 19% )。
短句来源
     Under ambient temperature and no oxygen,its sulfur capacity of removing H 2S reaches 16 8%.
     常温、缺氧条件下精脱H2 S穿透硫容可达 16 8% .
短句来源
     Under ambient temperature and no oxygen, its sulfur capacity of removing H2S reaches 16.8%.
     常温、缺氧条件下精脱H2S穿透硫容可达16.8%.
短句来源
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  相似匹配句对
     7 and oxygen No.
     7和No .
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     No.
     1和No.
     NO.
     NO.
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     And the creation velocity of reactive oxygen in Seaweed No.
     相反,海带No.
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  no oxygen
Ion backscattering shows ~ 6 at.% argon trapped in the films, but no oxygen was detected by either ion backscattering or by sputter-Auger analysis.
      
When the initial oxygen concentration of niobium and tantalum exceeded a threshold level, lithium (with no oxygen added) penetrated the refractory metal.
      
Furthermore, the oxygen gradient through the oxide scale is kept low, because no oxygen is removed at the scale-alloy interface.
      
No oxygen pressure dependence on the kinetics was found for either sample in this temperature range.
      
Thus, there is no "oxygen reserve" which protects dopamine release and metabolism from decrease in oxygen pressure.
      
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Chuanliansu (Ⅰ), C_(30)H_(38)O_(11), isolated from the bark of Melia toosendan et Z., is an active anthelmintic against ascaris.The NMR spectrum of chuanliansu (Ⅰ) showed three quarternary C-methyl groups and two acetoxyl groups.Acetylation of I with acetic anhydride and pyridine under forcing conditions yielded acetylchuanliansu (Ⅱ), C_(36)H_(44)O_(14), with a molecular weight of 700 as shown by mass spectrometry.Chuanliansu is a triterpenoid derivative containing a β-substituted furan ring.This is supported...

Chuanliansu (Ⅰ), C_(30)H_(38)O_(11), isolated from the bark of Melia toosendan et Z., is an active anthelmintic against ascaris.The NMR spectrum of chuanliansu (Ⅰ) showed three quarternary C-methyl groups and two acetoxyl groups.Acetylation of I with acetic anhydride and pyridine under forcing conditions yielded acetylchuanliansu (Ⅱ), C_(36)H_(44)O_(14), with a molecular weight of 700 as shown by mass spectrometry.Chuanliansu is a triterpenoid derivative containing a β-substituted furan ring.This is supported by the presence of oharaeteristic infrared bands at 3.25, 6.63 and 11.4μ and of NMR peaks at δ 6.15, 7.35 and 7.55.Hydrogenation of chuanliansu afforded tetrahydrochuanliansu (Ⅳ), C_(30)H_(42)O_(11),resulting in the saturation of the furan ring.Ozonolysis of acetylchuanliansu (Ⅱ) caused the cleavage of the furan ring to give the acid (Ⅶ), C_(33)H_(42)O_(15), with a pK_a value, expected for saturated carboxylic acids bearing no oxygen on the α-carbon.Reaction of Chuanliansu and acetylchuanliansu with thiocyanic acid gave Ⅷ-1 and Ⅷ-2, respectively, each with one molecule of water less than that calculated for a simple addition product (as shown by elemental analyses). This reveals the presence of a 1, 2-epoxide, and the stereochemistry of ring D may be expressed as A.The ORD curves of acetylchuanliansu (Ⅱ) and the acid (Ⅶ) obtained on ozonolysis both showed simple negative Cotton effect. The amplitude of the latter compound (Ⅶ) is markedly lower than that of the former (Ⅱ). According to the octant rule, we may place the koto grouping in ring C. The furan ring in the thiocyanic adducts (Ⅷ-1 and Ⅷ-2) was conjugated with the 13 (17) double bond as substantiated by their ultraviolet maxima at 234 nm. If the carbonyl group were at position 12, the extended conjugated system would be expected to show an absorption maximum at 314 nm. Thus we consider, by elimination, that the carbonyl group is situated at position 11. In furanoid triterpenes there are usually five C-methyl groups, but chuanliansu and its derivatives such as ⅩⅥ all revealed only three C-methyl groups in their NMR spectra. Therefore two hydroxymethyl groups should be present. Chuanliansu(Ⅰ) itself under mild alkaline conditions releases formaldehyde. This indicates that one hydroxymethyl group (—CH_2OH) is located at position 9, the α-position of the 11-keto group. This hydroxymethyl group should be of β-configuration on biogeneticgrounds (migrating from C-10), reminiscent of cucurbitacin.Treatment of deacetylchuanliansu (Ⅲ) with bismuth trioxide gave a black precipitate, the response being quicker than that of benzoin. But no reaction was observed with chuanliansu itself. Furthermore, oxidation of deacetylchuanliansu with chromic trioxide in pyridine gave an α-diketone (Ⅻ) as opposed to chuanliansu itself. Therefore an acetoxy group should be placed on C-12 of chuanliansu(Ⅰ).Most of the oxidation products of Ⅰ and Ⅱ were α, β-unsaturated ketones. Tetrahydrochuanliansu (Ⅳ) had an ultraviolet end absorption, expected of a trisubstituted double bond. These facts led us to suggest that one double bond and one hydroxyl group were in allylic relationship and located in ring B.Chromic trioxide oxidized deacetylchuanliansu to an α, β-unsaturated ketone which we now formulate as Ⅻ. This ketone rapidly absorbed approximately one mole of oxygen in dilute alkali at room temperature, presumably to furnish the fully conjugated dienedione(G). Since the α, β-unsaturated ketones obtained from Ⅰ did not absorb oxygen under the same conditions, an acetoxy group may be present at position 2 in ring A.When Ⅰ was fused with alkali, acetone was obtained. Therefore an ether linkage may be placed between C-3 and C-4. These results finally led to the proposal of formula Ⅰ as the structure of chuanliansu.

川楝素是从川楝树皮中提出的驱蛔活性成分,分子式为C_(30)H_(38)O_(11)。含有二个乙酰氧基;三个游离羟基,其中一个与双键有烯丙醇关系;一个羰基处于乙酰氧基的邻位;还有β-单取代呋喃环和1,2环氧基等基团。为一呋喃三萜。通过化学反应及光谱分析,初步确定它的化学结构及其立体构型如Ⅰ式所示。

It has been well recognized that hypoxic tumor cells are more resistant to chemotherapy and radiotherapy than oxic cells. The present study is designed to investigate the properties and ultrastructures of HeLa cells in hypoxic state. It is found that a few hypoxic cells retain their proliferating ability even if they had no oxygen supply for 48-72 hrs. as shown by growth curve or colony-forming test. The changes displayed in ultrastructure of the HeLa cells when they have been deprived of oxygen...

It has been well recognized that hypoxic tumor cells are more resistant to chemotherapy and radiotherapy than oxic cells. The present study is designed to investigate the properties and ultrastructures of HeLa cells in hypoxic state. It is found that a few hypoxic cells retain their proliferating ability even if they had no oxygen supply for 48-72 hrs. as shown by growth curve or colony-forming test. The changes displayed in ultrastructure of the HeLa cells when they have been deprived of oxygen are mainly the formation of vesicles in cytoplasm, and as the hypoxic state persisted the vesicles coalesced to form large spaces around the nuclei with a little cytoplasm around them. Scanning electron microscopy showed that there are quite a few "abnormal" podia in the hypoxic HeLa cells as early changes under hypoxia.

无论从细胞生物学角度或是从临床肿瘤学角度,对乏氧肿瘤细胞的研究都很重要。我们的观察表明,乏氧48~72小时的Hela细胞群体中仍有少数细胞维持增殖的能力。乏氧HeLa细胞的形态学改变主要有胞浆内出现空泡,并在细胞核与细胞浆间有巨大间隙的形成,扫描电镜下乏氧早期HeLa细胞有形似“不正常”的伪足形成,微绒毛亦较粗短,其意义尚有待深入探讨。

The equipment for Producing low oxygen content metal powder developed in this article is of a integral sealing type.The atomizer is composed of nozzle with atomi- zing pipe or with atomizing cabinet and the pressure of atomizing water is up to 16 MPa.The atomization and collection of powder can be simultaneously conducted by using a hydraulic rotator which is spray-absorption type.The main technological characteristic is to prevent from contacting with air during the process of making powder.The atomized hot...

The equipment for Producing low oxygen content metal powder developed in this article is of a integral sealing type.The atomizer is composed of nozzle with atomi- zing pipe or with atomizing cabinet and the pressure of atomizing water is up to 16 MPa.The atomization and collection of powder can be simultaneously conducted by using a hydraulic rotator which is spray-absorption type.The main technological characteristic is to prevent from contacting with air during the process of making powder.The atomized hot powder fell into cold water rapidly and was fiercely agitated so that there was no oxygen film formed on powder surfaces.Therefore metal powder with low oxygen conent could be produced.This de- vice has the advantages of compact structure,low cost convenicnt operation and maintenance, and is also available for experimental laboratories.The Paper has briefly described the opera- tion principles of the equipment,its main performance,processing charaCteristics and seve- ral techical problems which can be solved.

所研制的高压水雾化生产低含氧量金属粉末装置属于整体密封型。由喷嘴与雾化管或与雾化小室等组成雾化器,水压达16MPa。使用射吸式水力旋流器,使雾化制粉和粉末收集同时进行。其工艺特征主要是制粉过程与空气避免接触。雾化后的热态粉末,尽快落入冷水并作剧烈搅拌,使粉末表面不产生氧化薄膜,从而生产出低含氧量全属粉末。装置结构紧凑,造价低,操作维护方便,除供生产使用外,也可供实验室使用。文中扼要阐述了本装置的工作原理、主要性能、工艺特征以及装置中几个需要解决的技术问题。

 
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