双叶的

Theorem 2: the locus of foot point of the perpendicular line of between the origin and the tangent line of the cylindrical spiral is on the simple leaf camber hyperboloid of one sheet .

定理2 由坐标原点至圆柱螺线的切线所引垂线的垂足轨迹在单叶双曲面上。

Sequence comparison show it has 98.3% sequence identity with Malvastrum leaf curl virus identified in Guangxi province in Malvastrum coromandelianum.

全序列比较发现该双生病毒与在广西杂草赛葵上发现的赛葵曲叶病毒的同源性最高，达到98.3%。

The percentage distance (from the hybridization sites to centromeres) was(51.79±1.24)%.P5CS is widely present in monocot and dicot.

该探针定位于水稻第9染色体的短臂近端点处，信号点距着丝粒的相对距离为(51.79±1.24)%。P5CS基因广泛存在于单子叶和双子叶植物中。

The transient expression experiment with gus gene showed that mwcsllO promoter was induced by high salt and low temperature and promoted expression of structural genes in both monocotyledonous and dicotyledonous plants.

对gus基因瞬时表达实验表明，在单子叶和双子叶植物中，mwcS12O启动子均受低温和高盐逆境诱导，启动结构基因的表达，显示其在作物抗逆基因工程改良中的应用前景。

22 Of 22 pairs EST-SSR primers from Chinese cabbage/rape respectively had amplification products in soybean,wheat and maize,the rate of amplification was 81.8%,95.4%,100%,respectively;10 of 22 pairs EST-SSR primers showed polymorphism in monocotyledons wheat and maize,13 in dicotyledons oilseed rape and soybean,7 in both monocotyledonous and dicotyledonous crops.

（1）30对小麦EST-SSR引物中，有29，28和26对引物分别在玉米、油菜和大豆中有扩增产物，可扩增率分别为96.7%，93.3%和86.7%；其中分别有12对和9对引物在单子叶作物小麦和玉米及双子叶作物大豆和油菜中的扩增产物显示多态性，有4对引物在4种作物中的扩增产物均显示多态性。

These individual characters are similar to those of most aquatic plants in monocotyledonous Helodiales and dicotyledonous Nymphaeales, which reflects the phylogenetic relationships of Iris from aquatic plants to xerophil.

这些个体性状与单子叶沼生目和双子叶睡莲目多数水生植物相似，从一定程度上可以反映鸢尾属植物从水生到旱生的系统发生上的关系。

The product was characterized by means of X-ray diffraction, transmission electron microscope and Fourier transform infrared spectroscope.

采用硅烷和氨气在立式双温区流态床中化学气相沉积，制备了形状规则的球状无定形氮化硅纳米粉体，并利用X射线衍射、透射电镜和傅立叶红外研究了该纳米粉体的形貌、成分和物相。

By field breeding, we finally acquired 3 transgenic lines with good agronomic traits: SK-1, SK-2, and SK-3, which all showed obvious resistance to stripe stem borer and Xanthomonas oryzae pv. oryzae. The yield potentials were about 20% higher than those of Zhendao88 and Shengdao301; the quality was similar and some features were better.

通过田间选育，获得了农艺性状优良的双抗转基因水稻新品系SK-1、SK-2、SK-3，3个品系均对二化螟和白叶枯病菌表现出显著的抗性，产量高于镇稻88和圣稻301近20%，品质与镇稻88和圣稻301相近，部分指标优于这两个品种。

By using fluorescence spectrophotometry method,a systematic study was conducted to determine the effect of cadmium and lead ion stress on reactive oxygen species in creeping bent Agrotis stolonifera leaf tissue.

通过2种重金属离子和抗霉素A处理匍匐翦股颖Agrotis stolonifera幼苗叶片，利用2，'7'-二氯荧光黄双乙酸酯溶液对重金属胁迫和抗霉素A处理后叶片中产生的过氧化氢(H2O2)反应形成具荧光物质DCF的特性，用荧光光度分析法分析了叶片中H2O2产生与积累规律。

The stabilized biconjugate gradient and fast Fourier transform method is deployed to analyze the transient EM characterization of the objects embedded in a half-space and a three-layer background.

应用稳定的双共轭梯度－快速傅立叶变换方法，分析了两媒质半空间和三分层媒质中浅层埋入体的脉冲电磁散射。

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。