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肺螺是南美洲和非洲血吸虫的螺类宿主,最早出现于泥盆纪。经过地壳运动它们分布于两大洲上,虽经历了时空隔离,但其基本形态至今仍十分相似。分类学家借助细胞学与生化的手段作种类鉴别,用得最多的是螺体同工酶的电泳和免疫学分析。其实,螺类产生的体外生化因子完全有可能作为分类依据,因为肺螺以化学感受为主,并通过特异的化学物质(信息素)辨认同类进行交配。应用高效液相色谱及聚类分析,证明可根据不同种类肺螺在标准条件下释出的氨基酸谱作出鉴别。此外,它们的短链羧基酸化学感受小区亦有区别。
The snail is the snail host of S. japonicum in South America and Africa, first appeared in the Devonian. After their crustal movement, they are distributed on two continents. Although they have undergone space-time isolation, their basic forms are still very similar. Taxonomists use the means of cytology and biochemistry for species identification, the most used is the spiral isoenzyme electrophoresis and immunological analysis. In fact, the extra-corporeal biochemical factors produced by snails are entirely likely to be the basis for taxonomic classification because snails are predominantly chemoreversed and identified by their specific chemical species (pheromones) for mating. Application of high performance liquid chromatography and cluster analysis proved that according to different types of snails in the standard conditions of amino acid spectrum to be identified. In addition, their short-chain carboxy acid chemosensory cells are also different.