半叶法 half leaf method 对植物病毒进行生物定量的方法。由于以叶片主脉分界的两半叶片对病毒具有基本相同的敏感性，所以将局部病斑的病毒与寄主进行组合[如烟草花叶病毒与某种烟草（Nicotiana glutinosa）]，在一半叶片上接种标准浓度（已知浓度）的病毒，在另一半叶片上接种未知浓度的病毒材料，然后通过比较两半叶片的病斑数，来推知接种材料的病毒浓度。此方法的原理和对叶法相似。
用植物源抗病毒制剂VA与烟草花叶病毒（TMV）混合，经枯斑半叶法接种，结果证明，VA对TMV有较强的体外钝化作用，体外钝化后的枯斑抑制率为80 .0 % ；
VA , a anti viral agent from plants, could inactivate TMV in vitro , when it was mixed with TMV and inoculated by means of half leaf. The inhibition rate of necrotic local lesions was 80.0%.
提出了半涡轮叶轮计算方法，使单进口涡轮机一元流分析法得以在双进口无叶涡壳涡轮机上应用。
The calculating method of half turbine leaf was put forward, so it was possible that the single inlet turbine unary flow analysis method could be applied to the no leaf turbine.
图1。一批维尔纳叶法工艺生长的半晶柱，演示了这种晶体生长的各种颜色。
Figure 1. A selection of half boules grown by the Verneuil process, illustrating many of the colors these crystals are grown in.
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