The exine of pollen wall is of different electron density, the nexine dense and the sexine, comprising tectum, bacules, and foot layer, relatively thin.
花粉壁的外壁分为外层和内层，外层包括覆盖层、基粒棒和基足层等三层，内层只包含一层。
Electron density
英语例句库
原声例句
可汗学院：生物化学
Carbon is losing a little bit of electron density.
碳正在失去一点电子密度。
可汗学院：生物化学
The hydrogen is losing a little bit of electron density, therefore becoming partially positive.
氢正在失去一点点电子密度，因此变得部分正。
可汗学院：生物化学
So the carbon's losing a little bit of electron density, and this carbon is becoming partially positive like that.
所以碳失去了一点电子密度，并且这种碳变得像那样部分正。
可汗学院：生物化学
And since electron density is moving away from the carbon, the carbon gets a partial positive charge.
由于电子密度正在远离碳，因此碳会带上部分正电荷。
可汗学院：生物化学
And so the carbon is going to have a little bit more electron density than usual.
因此，碳的电子密度将比平时多一点。
可汗学院：生物化学
And the lithium is losing electron density, so we're going to say that lithium is partially positive.
锂正在失去电子密度，所以我们要说锂是部分正的。
英语百科
Electron density
Electron density is the measure of the probability of an electron being present at a specific location.
In molecules, regions of electron density are usually found around the atom, and its bonds. In de-localized or conjugated systems, such as phenol, benzene and compounds such as hemoglobin and chlorophyll, the electron density covers an entire region, i.e., in benzene they are found above and below the planar ring. This is sometimes shown diagrammatically as a series of alternating single and double bonds. In the case of phenol and benzene, a circle inside a hexagon shows the de-localized nature of the compound. This is shown below:
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