四碱的

It is indicated that the acetate anion and the weak organic alkali hexamethylenetetramine play the critical role in the formation of the layered precursors at the beginning of the process.

结果表明，在上述反应中醋酸根阴离子和弱有机碱六次甲基四胺对前驱体和ZnO纳米带的形成起了关键作用。

Genetic analysis with reciprocal crosses between gls and Kas plants indicated that gls possesses a recessive mutation in a single nucleotide locus.

遗传分析表明：gls突变体为单基因隐性突变；初步定位结果表明，GLS基因位于第四条染色体短臂上靠近0端的16万碱基附近区域。

A study on the chromatographic behaviours of codeine, morphine, papaverine , narcotine, cannabidiol, tetrahydrocannbinol, cannbinol and diacetyl morphine on wide bore capillary column in presented.

研究了可待因、吗啡、罂粟碱、那可汀、大麻酚、大麻二酚、四氢大麻酚和二乙酰吗啡在大口径毛细管柱上的色谱行为。

It is well reported that human telomeric DNA sequence [AGGG3] can form a well-defined quadruplex structure with the hydrogen bond between guanine bases in the appearance of K+ and Na+. It was reported that the formation and stability of the structure is meaningful for both gene regulation and apoptosis.

据文献报道，人类染色体端粒中的重复序列[AGGG3]可以在钠、钾离子存在的条件下通过四个G碱基间形成平面环状氢键从而折叠成四链结构G-quadruplex，此结构的形成与稳定对基因调控以及细胞的凋亡有着重要意义。

The DNA four kind of azotic basic group composition has the species specificity.

d。 DNA的四种含氮碱基组成具有物种特异性。

Three hundred and fifty-nine strains of bacterium and fifty-seven strains of yeast isolated from foregut, hindgut, coelomic liquid and body surface of Stichopus japonicus were studied for biochemical activities.

从刺参Stichopus japonicus前后消化管、体腔液和表皮上所分离到的359株细菌分别属于弧菌属、假单胞菌属、奈瑟氏球菌属、不动杆菌属、柄杆菌属、黄杆菌属、节杆菌属、微球菌属、黄单胞菌属、棒杆菌属、产碱菌属这十一个主要菌属；57株酵母菌分别属于球拟酵母属、红酵母属、隐球酵母属和德巴利氏酵母属四个属。

Methods Sample dosages were used 15mg,20mg,25mg/ by gstro gavage.The conrulsion rates was induced by maximum electric shock,ip cardiazin mice and lateral intracereral injection of curine in rats were observed.

方法采用克癫胶囊251、5、20mg/灌胃给药，观察最大电休克致小鼠惊厥率和筒箭毒碱侧脑室注射致大鼠惊厥率及戊四唑诱发小鼠惊厥的抗惊厥作用。

Four new salicylaldehyde derivatives with a glucose or mannose moiety were synthesized with 2-tert-butylphenol or 4-tert-butylphenol as the starting material, followed by the formylation, chloromethylation, nucleophilic substitution reaction with the desired carbohydrate. The salicylaldehyde derivatives condensed with ethylenediamine to give the Schiff bases, which coordinated with Mn to afford four novel sugar-based Salen Mn complexes.

首先，分别以2-叔丁基苯酚和4-叔丁基苯酚为起始原料，经过甲酰化反应、氯甲基化反应、和糖类衍生物的亲核取代反应制得了四种新型并入葡萄糖基或甘露糖基的水杨醛衍生物，将它们与乙二胺缩合生成希夫碱配体，得到的配体与过渡金属Mn~(3+)配位制备出四种新型含糖基的Salen Mn配合物。

To study genetic mutations of methylenetetrahydrofolate reductase C677T and cystathioinine-β-synthase T833C related to homocysteine metabolism in patients with ischemic stroke, the MTHFR gene C677T gene mutation and the CBS T833C gene mutation were detected by PCR-RFLP or ARMS method in 74 patients with ischemic stroke and 83 normal people for control. Results showed that the frequencies of MTHFR genet homogenetic type(2.7%), heterogenetic type(51.4%) and T allele(28.4%) in ischemic group were higher than those in control group(1.2%, 39.8% and 21.1%, respectively).

为研究同型半胱氨酸代谢相关酶亚甲基四氢叶酸还原酶基因C677T和胱硫醚-β合成酶基因T833C位点碱基突变与缺血性脑卒中的关系，对74例缺血性脑卒中患者和83例健康对照者，采用聚合酶链反应-限制性片段长度多态性技术检测MTHFR基因C677T基因型，用扩增阻滞突变体系法检测CBS基因T833C突变。

The improved L.D.Cua method was used to induce tetraploid of Trichosanthes kirilowii Maxim. The suitable treating time of 0.2% colchicine, the morphology characters and cytology identification between plants of diploid and obtained tetraploid were studied.

采用改良L.D.Cua法诱导短把栝楼获得四倍体，研究了0.2%浓度的秋水仙碱诱导短把栝楼染色体倍性变异的最佳处理时间、四倍体栝楼与原栝楼的形态特征及其四倍体与二倍体的细胞学鉴定。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。