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|Type:||Artigo de periódico|
|Title:||The Salivary Gland Secretions Of A Neotropical Bumblebee|
|Abstract:||The larval salivary gland secretions of Bombus atratus were studied with cytochemical and cytophysical methods. In the young feeding larvae a proteic filamentous secretion depicting striations perpendicular to the long axis of its fibrillary threads and exhibiting a wellordered macromolecular array was found. It appears not to differ from the silk secretion described for the fully grown larvae of an european Bombus species. However, in the fully grown larvae of B. atratus changes which have not yet been reported for other bees occur involving the salivary gland secretion. Two secretion types are then distinguishable. One is composed of carboxylated and sulfated acid glycosaminoglycans and glycoprotein(s) (mucous secretion), and the other has the same composition as that of the filamentous secretion of the young larvae, although differing morphologically and in terms of macromolecular alignment (flocculent secretion). The filamentous secretion is assumed to be involved in B. atratus with the spinning of the "silken partitions" which at a relatively early stage separate the larvae reared within a common cell from one another. The mucous and flocculent secretions will participate in the cocoons which will cover the pupating larvae. The filamentous and flocculent secretions appear to contain an α-helical fibroin, glycoprotein(s) and lipoprotein(s), but not collagen-type proteins. © 1979 Springer-Verlag.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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