UC知道找人翻译一篇英文
来源：百度知道 编辑：UC知道 时间：2024/05/30 22:36:42
9. Chemical shift imaging
In a static magnetic field, such as that generated by the magnet in the imaging system, the magnetic environment individual protons experience is modified by structural and electronic factors which are characteristic of the molecule containing protons. For example, the magnetic environment for the protons in methytlene (CH2) group will change depending on whether they are located adjacent to a carbony1 (CO) group or some other functional group within their parent molecule. The electronic cloud surrounding an aromatic molecule similarly generates magnetic properties of its own, which in turn influences the magnetic environment experienced by protons attached to the ring. Hence protons on other molecules do not resonate at the same frequency as aqueous protons. In the terminology of Equation 1 this can be expressed as:...
Where is a screening or shielding constant for the various classes of protonic nuclei present within the molecule , and n assumes in
In a static magnetic field, such as that generated by the magnet in the imaging system, the magnetic environment individual protons experience is modified by structural and electronic factors which are characteristic of the molecule containing protons. For example, the magnetic environment for the protons in methytlene (CH2) group will change depending on whether they are located adjacent to a carbony1 (CO) group or some other functional group within their parent molecule. The electronic cloud surrounding an aromatic molecule similarly generates magnetic properties of its own, which in turn influences the magnetic environment experienced by protons attached to the ring. Hence protons on other molecules do not resonate at the same frequency as aqueous protons. In the terminology of Equation 1 this can be expressed as:...
Where is a screening or shielding constant for the various classes of protonic nuclei present within the molecule , and n assumes in
9。化学位移成像
在一个静态磁场,如所产生的磁铁的磁场环境成像系统中,由单个质子经验的结构和电子因子的分子包含质子的特点。例如,磁环境中methytlene质子)集团将改变CH2(取决于他们是否毗邻一个carbony1(CO)集团或其他一些功能性小组在其母分子。围绕着芬芳的电子云产生的磁性质类似的分子自己,而这也就会反过来影响磁场环境所经历的质子附件的戒指。因此质子在其他分子不共振频率相同的水质子。在这个术语的方程,这可以表达为:……
哪里是一种筛或屏蔽固定的各类protonic细胞核在分子和n承担更大的值或整数。因此质子能够区分出在核磁共振波谱特征的基础上,他们的“化学位移的——不同的地点的ppm定义共鸣相对于参考标准。因此,化学位移选择性成像、成像的频率正好有刺激protonic共鸣的水以外,提供spatially-localized有关数据选择种类。化学
化学位移成像
在静磁场，如磁铁所产生的成像系统，磁场环境的个人经验是质子的结构修饰和电子因素的特点是分子含有质子。例如，磁环境的质子methytlene （甲基）集团将改变取决于它们是否位于邻近carbony1 （主任）集团或其他一些功能群在其母公司分子。周围的电子云的芳香分子同样会产生磁性的自己的，而这反过来又影响了磁场环境所经历的质子重视环。因此质子对其它分子不共鸣在相同的频率水质子。在术语的方程1这可以表示为： ...
如果是一个不断筛选或屏蔽的各种类别的质子核本的分子，和N假设整数值的一个或更多。因此质子能够区分在NMR谱的基础上，他们的化学shift' -的浓度不同定义的位置，他们的共鸣与参考标准。因此，化学位移选择性成像，成像的频率刺激一质子磁共振以外的水，提供了空间，局部数据的替代化学品的物种。