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问:什么叫植物血凝素?答:植物血凝素(Phytohemagglutinin,简称PHA)是豆科植物菜豆(Phaseolus vulgaris L.)提出的一种物质,很早有人发现它有凝血作用,故称为植物血凝素。PHA 是一种良好的细胞有丝分裂促进因子,可来自多种豆类植物种子如红色菜豆、黑色菜豆、黄荚菜豆、刀豆等。刀豆蛋白 A(Concanavalin A)就是从刀豆中提出的另一种促有丝分裂因子。问:植物血凝素的理化性质如何?它有那些生物学特性?
Q: What is phytohaemagglutinin? A: Phytohemagglutinin (PHA) is a substance proposed by legume bean (Phaseolus vulgaris L.). It was discovered very early that it has a coagulation effect, so it is called Phytohemagglutinin. PHA is a good cell mitogen-accelerating factor that can be derived from a variety of legume seeds such as red kidney bean, black kidney bean, yellow kidney bean, and jack bean. Concanavalin A is another mitogenic factor proposed by Concanavalin. Q: What are the physical and chemical properties of phytohemagglutinin and what are its biological characteristics?