查询词典 C.H.

Electron-withdrawing groups decrease the reactivity of benzylic C - H whileelectron-releasing groups enhance its reactivity. This is consistent with the well-knownelectron-demanding character of the Rh-carbene complex.

从相对速率的数值〓可以看到，吸电子基使苯甲位反应活性降低，给电子基使苯甲位反应活性增大，这和Rh-卡宾的亲电性一致。

These dikes are temporally and spatially associated with the gold deposit,and they have the same Pb isotopic compositions,which suggest the comagmatic activities in the same tectonic background.

区内脉岩与金矿在时空上密切伴生，Pb同位素组成接近，应属于同一构造同源岩浆活动的产物。结合前人C-H-O-流体包裹体研究成果，表明胶东金矿化中有幔源流体参与的成分。

The inhibition level of the COX activity by daphnetin after being treated for 2, 4, 8 and 12 h were 0.6%, 73% and 80% respectively and the inhibition level by daphnetin at different concentrations （0.1, 1, 100 and lmmol/L） for 6h was 3%, 31%, 53% and 84%, respectively.

在体外瑞香素可显著降低恶性疟原虫的细胞色素C氧化酶及核糖核酸还原酶活性。

But after 24 h,it was dosage depended,and had a random nonlinear relation.Conclusion In a certain scope of concentration,PMBE has no cytotoxity on HaCaT,and can be used in the selection of anti-inflammatory medicine for epidermic cells.

在随后的松皮、松针提取物鉴定中，发现其中含有大量的抗氧化剂———黄酮类化合物原花青素，它的抗氧化、清除自由基的能力是维生素C的20倍，维生素E的50倍[2，3]。

Electron donating substituent CH〓, OCH〓 and 4, 5-benzo make λ〓 red shift, electron with -drawing substituent F, Cl and CF〓 make λ〓 hypsochromic shift; b The W〓 is bigger than relative symmetrical carbocyanines, and the ratio of 0-1＇ and 0-0＇ transition intensity increase with the increase of σ〓; c The absorption and the fluorescence spectra are mirror image, and the λ〓 have a good linear relationship; d The Stokes shift △λ〓 and the Hammett σ〓 constant have a good linear relationship.

研究了染料的光物理性质，①苯环上取代基影响染料的λ〓和摩尔消光系数，相对于H，给电子取代基CH〓、OCH〓、4，5-benzo使λ〓红移，摩尔消光系数减小，吸电子取代基F、Cl、CF〓使λ〓蓝移，摩尔消光系数减小；②化合物吸收峰的半峰宽较相应的对称染料的大，且振动肩部与最大吸收峰的强度比随σ〓增大而增大；③吸收光谱与荧光光谱呈镜像关系，且λ〓与λ〓呈良好的线性关系；④化合物的Stokes位移△λ〓与取代基的Hammett σ〓常数呈线性关系。

C, h w;}' s: ^8 x "In that situation, you have to be very sure which one's a ball, which one's a strike," said Abreu, who jawed with Nelson after the call.

在那个情况下，你一定要很明确那一个是坏球，哪个是好球，」跟主审Nelson咆哮的Abreu 说：「那球离本垒板非常远，你根本不可能摸得到。

Among them strain MZ1 had been confirmed a lysogenic strain by indicator strain ZK1 after producing phage plaques induced by Mitomycin C.Two templates of overnight cultivation and its DNA from strain MZ1 were then amplified in the same time with five pairs of primers designed from the same phage,and the same products were obtained,suggesting that strain MZ1 was also confirmed a lysogenic strain by PCR method.

MZ1菌株的过夜培养液与指示菌ZK1(血清型H25)混匀并在双层琼脂上培养12 h后出现了滴度为2×107 pfu的噬菌斑，从而证明生产菌株MZ1确为溶原菌；又以GIL01同源性较高的其它四个基因设计引物，分别以MZ1的培养物及其溶原性噬菌体基因组为模板进行PCR扩增，结果两者得到几乎一致的带型，进一步证明了生产菌株MZ1为溶原菌，说明利用PCR法检测鉴定苏云金杆菌的溶原性是可行的。

In the presence of catalytic rhodium acetate, ethyl 2-diazo-3-oxo-per fluoroalkanoates, reacted readily with nitriles to give a series of 5-fluoroalkyl substituted 1, 3oxazoles with high regio-selectivity through a metal carbenoid intermediate. The reactions of carbenoids with noncyclic vinyl ethers or cyclic vinyl ethers afforded dihydrofuroates in good to excellent yields. Interestingly, only vinyl C-H insertion compound was obtained concerning of the reaction of carbenoids with 2, 5dimethylfuran due to the steric hindrance of methyl group

醋酸铑分解2-重氮-3-氧代-全氟羧酸乙酯形成的金属卡宾作为1，3-偶极体，可以与一系列芳基或烷基取代的腈反应，高度区域选择性地生成一系列4-乙氧羰基-5-氟烷基取代的噁唑化合物；也可以与富电子的链状和环状的烯基醚反应，以优良的产率得到一系列氟烷基取代的二氢呋喃类化合物；而与2，5-二甲基呋喃的反应，由于甲基的位阻作用，只得到金属卡宾对呋喃3-位烯基碳氢键插入产物。

The mechanism of the dehydrogenation reaction of OsO〓 with methane For the reaction, OsO〓+CH〓→OOs〓+H〓, the minimum energy reaction path involves two PESs of quartet and doublet states.

因此整个反应的速率决定步骤是分子氢从二重态的亚甲基二氢化物中还原消去，能垒大约为30.4kcal/mol.c。

There exists the optimum technical parameters about the effects of hydrolysis conditions. When the concentration of H+is 2.6 2.8 mol/L, the concentration of TiOSO4 is 25 28 g/L, the time of hydrolyzation is 60 min and the temperature of hydrolyzation is 125℃respectively, the yield of TiOSO4reaches 95%, the particle size of H3TiO3 is less than 40 nm, and the powder of H3TiO3 is spheral.

研究结果表明：水解条件直接影响偏钛酸的粒径及其分布，其中，钛液酸度的影响最大；水解条件对TiOSO4水解率和偏钛酸粒径的影响存在着最佳结合点，即当c为2.6~2.8 mol/L，ρ(TiOSO4)(按TiO2计)为25~28 g/L，水解时间为60 min，水解温度为125℃时， TiOSO4的水解率可达95%以上，得到的偏钛酸呈球形且粒径为40 nm。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新