双叶的

To improve the performance of image-denoising methods, a locally adaptive denoising algorithm was presented. The new algorithm assumed the statistical dependence among wavelet coefficients. First, a bivariate probability distribution model was introduced to model the statistics of wavelet coefficients, and corresponding nonlinear threshold function was derived from the model using the Bayesian estimation theory.

由于图像小波系数存在很大的层间相关性，引入双变量概率分布模型，基于贝叶斯估计理论，得到了相应的非线性阈值函数；基于层内局域方差估计，利用该收缩函数得到一种局域自适应的图像去噪算法。

The functional connectivity of LIFG in aphasia patients is different with that in normal subjects, because of the infarction,the left fusiform gyrus,bilateral medial frontal gyrus and right anterior cingulum in aphasia patients showed low degree correlation.

脑梗死运动性失语患者组与LIFG的功能连接与正常对照组不同，由于患者组中脑梗死病灶的影响，左侧梭状回、双侧额叶内侧回、右侧前扣带与LIFG的连接程度减低。

A strong A-T bias was found in the nucleotide sequence of mitochondrial genome of the Mongolian wolf. All the transfer RNA genes could be folded into the typical cloverleaf-shaped structure except tRNA-Ser, which lacked the "DHU" arm.

序列碱基的组成存在明显的A-T偏好性。tRNA基因中除tRNA-Ser缺少双氢尿嘧啶臂以外，其余均能折叠成典型的三叶草二级结构。

These results show that codA gene cloned from E. coli can express specifically in the anther of both monocotyledon and dicotyledon plant species upon induction of 5-FC, and the in vivo expression product of the gene can transform the 5-FC used externally into 5-FU, which leads to all or partial inactivity of anthers and/or pollens.

以上结果表明，codA基因在单子叶植物和双子叶植物花药中的特异性表达，能将外用的5-FC在体内转化为5-FU，导致花药或花粉的部分和全部失活。

In dicotyledonous and nongraminaceous plants, NAS synthesizes nicotianamine which is responsible for iron storage and transportation, and the expression of NAS gene is not induced by iron deficiency.

在双子叶和非禾本科单子叶植物中，烟酰胺的主要功能是铁离子的储藏和运输，NAS基因的表达不受缺铁胁迫诱导。

By comparing their sequences with homologues from other plants, it was found that GME genes were highly conserved among plant species, though phylogenetic study showed that all known GMEs could be divided into two distinct groups corresponding to monocots and dicots.

通过逆转录PCR技术从水稻成熟叶片中克隆到两个GME基因的cDNA序列，并与其他植物物种中的GMEs进行比对，结果显示，GME基因在所有植物物种中高度保守，尽管进化树分析表明单子叶植物GMEs和双子叶植物GMEs在进化上相互独立。

Firstly, both cDNAs were isolated from the rice mature leaves using RT-PCR technique. By comparing their sequences with homologues from other plants, it was found that GME genes were highly conserved among plant species, though phylogenetic study showed that all known GMEs could be divided into two distinct groups corresponding to monocots and dicots.

通过逆转录PCR技术从水稻成熟叶片中克隆到两个GME基因的cDNA序列，并与其他植物物种中的GMEs进行比对，结果显示，GME基因在所有植物物种中高度保守，尽管进化树分析表明单子叶植物GMEs和双子叶植物GMEs在进化上相互独立。

In conservative families, there has been little or no change in the number of genes since the divergence between eudicots and monocots ~145 million years ago.

在保守的家族中，基因的数目在大约一亿四千五百万年前(~145MYA)真双子叶植物和单子叶植物发生分化之后都没有改变或者变化甚微。

The findings of imaging of all cases included bilateral white matter of parietal and occipital lobe abnormalities, which appeared as large areas of low density on CT scan, hypointense in T1 and hyperintense in T2 on MRI scan.

头颅CT或MRI检查5例均显示双侧顶枕叶白质为主的较大范围的异常，其中CT为低密度、MRI为长T1、长T2信号。

The annealing behavior of double-space in the neutron irradiation Czochralski silicon is studied by Fourier transform infrared spectrometer technique and positron annihilation spectroscopy.

利用傅立叶红外吸收光谱和正电子湮没技术对快中子辐照直拉硅中的双空位(V2)的退火行为进行了研究。

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。