Conclusion Both investment materials cause no obvious changes on biological characteristics of pure titanium castings with the existing of surface structural changes.
结论两种包埋料所致纯钛铸件表面结构的变化未导致其生物学性能方面的明显改变。
2
Purebiological extraction, do not contain easy-damage fruit surface material and chemical additive, safe to the leaf surface of crop and the fruit surface.
纯生物提取，不含易破坏果面物质和化学添加剂，对作物叶面和果面安全。
3
A chemical produced in comparatively small quantities and in a relatively pure state. Pharmaceutical and biological products, perfumes, photographic chemicals, and reagent chemicals are examples.