Department of Plant Medicals, Andong National University, Andong, GB, 36729, Republic of Korea; Department of Ecology and Genetics, University of Oulu, P.O Box 3000, SF-90140, Oulu, Finland.
Biocenter Microscopy Service, University of Oulu, Aapistie 5, SF- 90220, Oulu, Finland.
Zoology (Jena). 2020 Jun;140:125798. doi: 10.1016/j.zool.2020.125798. Epub 2020 Apr 14.
An extraordinary micro-structural similarity between squid sucker teeth and the egg shell of a terrestrial planarian worm has been reported, but to date only the amino acid content of the squid sucker tooth has been available. This prompted us to analyse the amino acid content of the planarian egg shell. Although both share an absence of detectable chitin and metal ions and both possess relatively high amounts of the amino acids GLY and HIS, the planarian egg shell is considerably richer in GLU, LYS and ASP. Most dramatic was the difference in TYR, which was the second most abundant amino acid in the squid, but hardly featured at all in the planarian egg shell. In the light of these new findings the different functional roles that the structures in question play in the lives of the two taxa are discussed. An EDS-analysis revealed clear C, N, and O peaks and additional very small peaks less than 0.1w% suggesting the presence of one or both S and Cl.
已报道鱿鱼吸盘牙齿与陆地扁形虫卵壳之间存在非凡的微观结构相似性，但迄今为止，仅获得了鱿鱼吸盘牙齿的氨基酸含量。这促使我们分析扁形虫卵壳的氨基酸含量。尽管两者都缺乏可检测到的几丁质和金属离子，并且都含有相对较高含量的氨基酸 GLY 和 HIS，但扁形虫卵壳中 GLU、LYS 和 ASP 的含量要高得多。最显著的差异是 TYR，它是鱿鱼中第二丰富的氨基酸，但在扁形虫卵壳中几乎没有。鉴于这些新发现，讨论了这些结构在两个分类群的生活中所起的不同功能作用。EDS 分析显示出明显的 C、N 和 O 峰，以及另外不到 0.1w%的非常小的峰，表明存在一个或两个 S 和 Cl。
