互变的

A novel carbonyl transposition led by anilines'nucleophilic addition to methyl 2-keto α-D-glucopyranoside was discovered. And the mechanism of the reaction concerned to an enol rearrangment was provided through tracing the change of 〓H-NMR and 〓C-NMR of a hemiacetal intermediate which was obtained in the reaction of o-phenylene diamine with 2-keto glycoside. Both the intermediate and the converting product were identified by 〓H-NMR,〓C-NMR,〓H-〓H COSY and HMQC.

一、发现了2-位氧化α-甲基D-葡萄糖苷的芳胺亲核加成引起羰基转位的新方法，利用核磁共振氢谱及碳谱对邻苯二胺与2-位氧化α-甲基D-葡萄糖苷加成生成的稳定中间体半缩酮化合物在氘代丙酮中的变化进行跟踪，结合对转化产物的氢氢相关谱和HMQC结构确证，提出了该反应中2-位羰基通过烯醇化互变而转至3-位的机理并得到了验证。

The Paired Comparison and Constancy Graphical approaches for statistical analysis will be used for the psychological experiment.

因此，针对声源方向感受此一课题，以两反射音之模拟声场进行实验探讨，研究方法不仅以数理解析，并针对人们实验的心理感受进行调查分析，心理实验时采用配对比较法及恒常性图解法统计分析，试图藉由若干变因的控制进行量化，实验结果发现声源方向感度的变化，主要受制於双耳互函数级数及全反射音振幅的大小，双耳听觉互函数主要与反射到达测听者的方向和反射的幅度有关，证实声源方向感度与双耳互函数级数为正比之关系存在。

Its mechanism is the use of anthraquinone in alkali conditions off proton surface forming 10 more stable carbon anion face, but because carbon anion and oxygen ion exist between testosterone and enolate type each other changes, cause reaction product complex, at least five, reaction selectivity, product yield, separation difficulties, and product purity is not high, therefore, using the type and quantity of alkali, phase transfer catalyst type, solvent, to optimize the selection process conditions so as to improve the yield target product.

其机理是利用蒽酮在碱存在的条件下脱去氢质子面形成10位较稳定的碳负离子面进行，但是因为碳负离子和氧负离子之间存在酮式和烯醇式的互变，导致反应复杂，产物至少有五种，反应选择性差，产物分离困难，产率低，且产品纯度不高，因此，利用对碱的种类和量的多少，相转移催化剂的种类，反应溶剂的选择，来优化反应工艺条件从而提高目标产物的产率。

The results show that this kind of IPN hydrogels are temperature-sensitive, and, compared with inorganically crosslinking PNIPAAm hydrogels, these IPN hydrogels exhibit enhanced storage modulus and ultrafast response rate, such as losing water of 90% within 10 min because of the porous structure which provides the water-releasing channel; by incorporation of PAAm network, the phase transition of PNIPAAm hydrogels is weakened, but the lower critical solution temperature is increased.

研究表明，该IPN凝胶具有温度敏感性；与未互穿的无机交联PNIPAAm凝胶相比，IPN凝胶具有多孔的网络结构和超快的响应速率，如10min内失去90%的水；其储能模量增加了3~4倍，相转变行为变弱，而最低临界溶解温度提高了1.4℃。

Theseall make the equivalent-potential model incorrect, which is a correct modelunder low frequency. Otherwise, the methods of segmentation are often used intransient computation. Many scholars ignored the effects of mutual-admittancebetween conductors when doing transient computation for the complexity.

另外，处理地网暂态往往采用分段的办法，如果考虑导体段之间的互导纳，将使计算变得复杂，因此很多学者计算地网暂态特性时往往没有考虑导体之间的互导纳。

Pyridoxine, pyridoxal , pyridoxamine as well as their phosphated forms are structural analogues in which pyridoxal-5"-phosphate and pyridoxamine-5"- phosphate are the biological active forms in vivo which act as the cofactors of aminotransferases, amino acid decarboxylases, cysteine desufbrase and cystathionine , etc by constant transconversions. Recently, it was discovered that B6 played a novel role in tumor growth suppression.

它包括三种结构十分近似的化合物：吡哆醇(Pyidoxine，PN)、吡哆醛(Pyridoxal，PL)和吡哆胺(Pyridoxamine，PM)，分别以磷酸化的形式发挥作用，其中吡哆醛-5'-磷酸(Pyridoxal-5'-phosphate，PLP)为B_6在体内的活性形式，通过与磷酸吡哆胺(Pyidoxamine-5-phosphate，PMP)的互变，作为多种酶(氨基转移酶、氨基酸脱羧酶、半胱氨酸脱硫酶、胱硫醚酶等)的辅酶而发挥传递基团的作用。

The results show that both conformations of prolyl peptide bond are not easy to transit from each other supporting the opinion that both of the BPP's bio-characters are from its conformations separately. And the function of BPP may not lie on a conformation. The other peptide bond conformations also have influence.

结果表明，脯氨酸肽键构象不易发生互变，无论哪种构象均不存在向另一种构象转变的趋势，从侧面支持了BPP具有的两种稳定的生物学作用是来自于肽键的不同构象的观点，而且BPP的生物学作用可能也不是取决于某一个肽键构象，其它脯氨酸肽键构象对其活性也存在影响。

The results are in good agreement with available experimental results. The entropy effect on the Gibbs free energies of 6-thioxanthine base is very small and there is little significance for the tautomeric equilibria of the base.

计算结果同已有实验结果一致。6-硫代黄嘌呤异构化的熵效应小，对互变异构平衡几乎没有显著的影响，而焓变对互变异构产生了主要的影响。

Mathematics was the thought science, the nature and the quantity tautomerize rule, in the concept teaching contradictory movement, in the problem solving the condition and the conclusion transformation, the number and the shape unification and so on manifests in mathematics teaching to raise the process which the student thought transformed.

数学是思维的科学，质与量的互变规律，概念教学中的矛盾运动，解题中条件与结论的转化，数与形的统一等等都体现了数学教学中培养学生思维转换的过程。

Leaves variable, those on previous year's branches usually alternate, those on short branches approximate and often fascicled; petiole 1–2(–3) cm, glabrous, with 2 to 4 nectaries at apex or at base of leaf blade; leaf blade lanceolate to elliptic-lanceolate, 3–6(–9)× 1–2.5 cm, slightly pilose when young, glabrescent, base broadly cuneate to rounded, margin shallowly densely serrate, apex acute to shortly acuminate.

易变的叶，那些在通常互生的第二年分枝上，那些在短枝紧靠和通常簇生上；叶柄1-2(-3)厘米，无毛，具2在4蜜腺在先端或叶片的在基部；叶片披针形的到椭圆形披针形， 3-6(-9)* 1-2.5 浅的幼时的厘米，稍具柔毛，后脱落，基部宽楔形到圆形，边缘浓密有锯齿，先端锐尖到短渐尖。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！