ISSN:
1432-0878
Schlagwort(e):
Corpus allatum
;
Insects
;
Cribriform inclusions
;
Ultrastructure
;
Cytophysiology
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
,
Medizin
Notizen:
Summary Ultrastructural evidence is presented for the manufacture, storage, and release of a distinctive cellular product in the corpus allatum of the insect Leucophaea. This product (C body material) originates in the Golgi zone and acquires a characteristic, regularly structured appearance of exceptionally high electron density. The differential distribution of this easily identified product in various sites in the organ permits the reconstruction of a sequence of dynamic events involving transport from the intra- to the extracellular compartment which affords access to the circulation. A small amount of (surplus ?) C body material becomes incorporated in multivesicular bodies. The variability in the occurrence, distribution, and fate of the C body material during various periods of the animal's life cycle, and under experimentally altered conditions, suggests a relationship with the glandular function of the corpus allatum. Conspicuous deposits of C body material, especially in the extracellular stroma, parallel situations in which the hormonal activity of the organ seems to be low or temporarily suspended. Thus the ultrastructural manifestations of intermittent sluggishness in the system, as observed in Leucophaea, provide valuable cues for the existence of a periodically changing production line involving a specific glandular material. The precise relationship with the comparable cyclicity of juvenile hormone activity remains to be ascertained.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00331240
