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In order to research the relations of carbon sources to structure of PHAs, six kinds of PHAs sample were synthesized by activated sludge with six different carbon sources respectively in the aerobic-anaerobic-anoxic process. Their structures were determined by 〓HNMR、〓CNMR and GC-MS. When the carbon source was acetate, the unit composition of PHAs was 93. 91mol% 3-hydroxybutanoic acid and 6. 09mol% 3-hydroxypentanoic acid ; When the carbon source was propionate, the unit composition of PHAs was 28. 66mol% HB, 63. 13mol%HV, 2. 55mol% 2-methy-3-hydroxy-butanoic acid (2MHB) and 5. 66mol% 2-methyl-3-hydroxypentanoic acid (2MHV); When the carbon source was 80% butyrate and 20% 1, 4-butanediol, the unit composition of PHAs was 65. 03mol% HB, 28. 06mol%HV, 1. 91mol%2MHB, 2. 69mol% 2MHV, 0.73mol% 4-hydroxy butanoic acid (4HB), 0.78mol% 4-methyl-3-hydroxy-pentanoic acid (4MHV), 0.80mol% 3-hydroxyhexanoic acid ; When the carbon source was 20% butyrate and 80% 1, 4-butanediol, the unit composition of PHAs was 61. 39mol% HB, 23. 01mol%HV, 4. 58mol%2MHB, 5. 97mol% 2MHV, 0.91mol% 4HB, 2. 37mol% 4MHV, 1. 77mol% HHx; When the carbon source was 60% pentanoate and 40%glucose, the unit composition of PHAs was 41. 24mol% HB, 58. 76mol%HV; When the carbon source was 60% benzoate and 40% glucose, the unit composition of PHAs was 65. 48mol% HB and 34. 52mol% HV.
为了研究不同碳源与产物PHAs结构的关系,采用好氧-厌氧-缺氧模式利用6种不同碳源培养活性污泥得到6种不同的PHAs样品,通过〓HNMR、〓CNMR和GC-MS谱图确定了这6种PHAs的单体成分和比例:以乙酸钠培养活性污泥得到的PHAs的单体组成是93.91mol%3-羟基丁酸和6.09mol%3-羟基戊酸;以丙酸钠培养活性污泥得到的PHAs的单体组成除28.66mol%HB、63.13mol%HV外,另外还有2.55mol%3-羟基2-甲基丁酸(2MHB)和5.66mol%3-羟基2-甲基戊酸(2MHV);以80%丁酸钠和20%1,4-丁二醇混合溶液培养活性污泥得到的PHAs含有七种单体组成:65.03mol%HB,28.06mol%HV,1.91mol%2MHB,2.69mol%2MHV,0.73mol%4-HB(4-羟基丁酸),0.78mol%4MHV(3-羟基-4-甲基戊酸),0.80%HHx(3-羟基己酸);以20%丁酸钠和80%1,4-丁二醇培养活性污泥所得到的PHAs含有与3#样品相同的七种单体,只是比例不同,分别是61.39mol%,23.01mol%,4.58mol%,5.97mol%,0.91mol%,2.37mol%,1.77mol%;以60%戊酸钠和40%葡萄糖培养活性污泥所得到的PHAs由HB和HV组成,比例是41.24 mol%∶58.76 mol%;以60%苯甲酸钠和40%葡萄糖培养活性污泥所得到的PHAs也由HB和HV组成,比例是65.48 mol%∶34.52 mol%。
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The application of flamelet model based on level set in premixed turbulence combustion;2. A methane turbulent non-premixed flame has been simulated numerically by the combination of laminar flamelet model and presumed probability density function.
将小火焰模型和假定的PDF方法相结合,模拟甲烷湍流射流扩散火焰,稳态火焰面结构由层流小火焰数据库得到,采用详细化学反应机理描述甲烷的氧化和NO以及碳烟的生成,数值模拟结果和实验数据吻合较好,说明小火焰模型可以较准确地计算出扩散湍流火焰中的燃烧过程。
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The CLIMAP 18k bp sediment data files were compiled by Oregon State University. The files contain micropaleontology in the form of faunal counts of diatoms, planktonic foraminifera, coccoliths, and radiolaria, as well as stratigraphy (percent fine, coarse, total carbonate, oxygen 18 and carbon 13), and geochemistry (percent opal, quartz, and organic carbon), and inferred sea surface temperatures for 635 ocean sediment cores.
此数据库的沉积物数据由Oregon州大学收集编制,包括硅藻动物群、浮游有孔虫目、颗石藻、放射虫目中的古微生物,以及地层中碳酸盐、氧18和碳13的百分含量和由635个海底沉积物钻芯样本推测得到的海面温度。
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Three immobilization modes of antigen to the polymers in the pH-sensitive phase separation immunoassay were investigated and compared. The results showed that the immobilization mode in the presence of N-ethyl-N'-(3-dimethylaminopropyl)carbodiimide hydrochloride rendered the most desirable results. The immobilization efficiencies and immunological reaction activities of immobilized antigen of this mode were improved over the other two modes.
本文研究并比较了pH敏感相分离免疫分析中抗原在高分子上的三种固定化模式,结果显示由碳二亚胺偶联的固定模式效果最好,固定化效率、固定抗原的免疫反应活性较之另外两种模式均得到了提高。
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E isoated and obtained a excellent strain of producing 2 - keto - L - gulonic acid -Bdellovibrio J26. The fermentation condition of 2 - keto - L - gulonic acid(2 - KGA) wasstudied extensively. Addition some carbon source or nitrogen source in culture medium canincrease the 2 - KGA yield from 5O - 6Omg/ml to 7O - 76 mg/ml.
对新分离得到的能产生维生素C前体2-酮基-L-古龙酸(2-KGA)的优良菌株蛭弧菌J26,进行了一系列摇瓶发酵条件试验,通过添加一些其它有机碳源或其它氮源,可使蛭弧菌J26摇瓶发酵产生2-KGA由50-60mg/ml上升到70mg/ml以上,采用SMA探针技术的流加发酵摇瓶试验产生2-KGA可以达到83.9-91.7mg/ml。
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Chiral centers of C5 and C8 are directly constructed in the key step of the diastereoselective propargylation from D--tartrate. The methylation and subsequent methoxycarbonylation result in desymmetrization of the terminal dialkynes. The α,β-unsaturated δ-lactone is synthesized after partial hydrogenation and lactonization.
由非天然酒石酸出发,利用双向非对映选择性的炔丙基化反应,在一步反应中同时构建C5和C8手性中心;然后通过末端炔基的甲基化、甲酯基化,延长碳链并对分子去对称化;内酯化得到关键中间体α,β-不饱和六元内酯,再经多步反应转化得到8-epi--Boronolide。
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Oxazaborolidine, which derive from the coordination of amino alcohol and borane, are good catalysts for the borane reduction reaction. A kind of fused cyclic oxazaborolidine invented by Corey and derived from proline has been successfully used in the production of MK-0417 as excellent chiral catalyst by Merck company.
在该反应中氨基醇类配体原位与硼烷配位形成的手性恶唑硼烷是该反应的良好催化剂,其中Corey等发明的由脯氨酸出发制备的稠环手性催化剂性能优异,已经在Merck公司生产碳酸酐酶抑制剂MK-0417中得到成功应用。
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Thus if we control the reaction temperature at somesolvent we can obtain the products either by the reaction of phosphoryl-stabilizedcarbonanion with N-tosyl imines or by the reaction of methoxycarbonyl-stabilizedcarbanion with N-tosyl imines.
在一定溶剂中,如果控制反应的温度可以控制得到由膦酰基稳定的碳负离子和亚胺反应或由甲氧羰基稳定的碳负离子和亚胺反应。
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Their crystallinity, solubility and the effect of lowering pour point of crude have been studied.
由实验得到以下结论:EVA降凝剂的CH2链上只有远离极性基团的碳原子能够参与结晶。
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This invention discloses one lithium ion battery anode materials, which is made by following steps: a, mixing lithium salt, microcosmic salt and ferrous oxalate for grinding with mole proportion as one to one to one; after drying under nitrogen gas protection in 300-400DEG C for heating for five to eight hours; b, adding addictive agent into the mixture with weight proportion as3-10:1; c, bursting the mixture gas under inertia gas protection under temperature of 500-800DEG C for 10 to 24 hours; d, adding the product into crucible with active carbon 10 to 40 g and adjusting the microwave frequency into 140 to 700 W with control time as 1 to 14 minutes.
本发明公开了一种锂离子电池正极材料,由70-90wt%的LiFePO 4 和10-30wt%的碳组成,按照以下步骤制备:(1)将锂盐、磷盐和草酸亚铁混合球磨,所述锂、铁和磷元素的摩尔比为1∶1∶1,干燥后在氮气保护下300~400℃预热5~8小时;(2)在上述的混合物中加入添加剂,所述混合物与添加剂的重量比为3~10∶1;(3)将步骤(2)得到的混合物在惰性气体保护下,进行焙烧,焙烧温度为500~800℃,焙烧时间为10~24小时;(4)将焙烧后的产物压片,放入装有活性炭10~40g的坩锅,再将坩锅放入微波炉中,微波功率调至140~700W,控制时间为1~14分钟。
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carbonic acid:石炭酸
carbonic a. 碳的,由碳得到的 | carbonic acid 石炭酸 | carboniferous n. 石炭纪,石炭层
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hemiacetal:半缩醛
半缩醛(Hemiacetal)是一类同一碳上连有一个羟基,一个烷氧基和一个氢的有机化合物. 半缩醛可由醛与醇反应得到,而半缩醛可以继续和醇反应得到缩醛. 半缩醛在酸性和碱性水溶液中都是不稳定的. Source: Baidu
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carbonide:碳化物(指金属碳化物)
carbonic | 碳的, 由碳得到的 | carbonide | 碳化物(指金属碳化物) | Carboniferous | 石炭纪, 石炭层 含碳或煤的
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Soudan:苏丹
第三张图版是苏丹(Soudan)的黑硅石,约含百分之二的碳质. 第四张图版是南非洲的无花果树(Fig Tree)黑硅石. 图八是由枪火(Gunflint)黑硅石(约17亿年前)中找到的微体化石. 以氟酸处理此黑硅石,可以得到如图九所示的菌状体.