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加拿大昆虫学家Locke提出鳞翅目幼虫体内有一个适应血细胞进行气体交换的肺结构。本文以Locke的研究为依据,运用电镜及其他化学方法,观察和研究了粘虫Leucania separata及棉大卷叶螟Sylepta derogata幼虫的肺结构和功能。结果表明:肺存在于第8腹节的气管处,该气管分支细短而丰富,形成气管簇。亚甲基蓝标记血液发现,血流方向为由前向侧后方向,流经第8腹节和臀腔,最后流回心脏。第8腹节气管簇的管壁比其他各节都薄,且管壁内膜具有更多适合运动的细管,这有利于气体的通透。正常情况下,气管簇处有各种各样的血细胞聚集,当缺氧胁迫时有大量的血细胞从组织中释放,通过变形而紧贴气管簇,以利于气体的交换。这些特征都与高等动物的肺功能相似,因而判断此结构存在肺的功能。
Canadian entomologist Locke proposed that lepidopteran larvae have a lung structure that accommodates blood cells for gas exchange. Based on the study of Locke, the structure and function of the larvae of the armyworm Leucania separata and the Sylepta derogata larvae were observed and studied by electron microscopy and other chemical methods. The results showed that: the lung exists in the trachea of the eighth abdominal segment, the tracheal branch is short and abundant, forming tracheal tufts. Methylene blue labeled blood found that the direction of blood flow from the anterior to the posterior direction, through the eighth abdominal and hip cavity, and finally back to the heart. The eighth abdominal section of the tracheal tube wall than other sections are thin, and the wall of the tunica intima has more suitable for thin tube, which is conducive to gas permeability. Under normal circumstances, the tracheal turtles have a variety of blood cell aggregation, when hypoxia stress, a large number of blood cells released from the tissue, through the deformation and close to the trachea, in order to facilitate gas exchange. These features are similar to the lung function of higher animals, and thus determine the structure of lung function.