𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Comments on the origin of the midgut in insects

✍ Scribed by A. Glenn Richards Jr.

Publisher
John Wiley and Sons
Year
1932
Tongue
English
Weight
462 KB
Volume
53
Category
Article
ISSN
0362-2525

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✦ Synopsis

Abstract

Reviews the question of the origin of the midgut of insects with its diverse appearances and interpretations. Without doubt the midgut epithelium in some insects is derived from the lower layer, but in other insects from the tips of the stomodaeal and proctodaeal invaginations. The question of its origin seems to be β€œa function of the position within the whole,” and best understood from a standpoint of the time of determination of the parts involved. Maps illustrating the prospective significances of the principal types are included and discussed.

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DNA-RNA bodies in midgut cells of the st
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✍ Scali, Valerio ;Montanelli, Elisa πŸ“‚ Article πŸ“… 1975 πŸ› John Wiley and Sons 🌐 English βš– 332 KB

## Abstract In the anterior part of the midgut and in the Malpighian tubules of the stick insect __Bacillus rossius__, about 10% of the epithelial cells develop endonuclear bodies which appear as DNA‐RNA masses; in these cells the usual nucleoli are no longer evident. The DNA‐RNA bodies are first f