| Autor: |
Bouthier, A., Lhonoré, J. |
| Zdroj: |
Journal of Comparative Physiology B: Biochemical, Systemic & Environmental Physiology; Nov1984, Vol. 154 Issue 6, p549-560, 12p |
| Abstrakt: |
Locusta epidermal cells accumulate in their cytoplasm various inclusions which give rise to tegumentary patterns of brown spots and lines. Five major types of inclusions are identified. Ultrastructural examination and electron microprobe studies show that types 1, 2 and 3 correspond to successive steps of concentric pigment and mineral deposition on a matrix. Type 3 is the richest in ommochromes (acridiommatins 1 and 2), and mineralized with calcium phosphate. Type 4 is characterized by pigment and mineral disappearance, which in type. 5 are substituted by uric microcrystals. From the end of the 4 instar to the beginning of the imaginal life, three generations of inclusions are observed to succeed each other in the different epidermal cells. Tergal, pleural and sternal areas are characterized by the morphology and biochemical composition of the inclusions they accumulate. Despite cellular asynchronism, ecdysis is accompanied by a phase of pigment and cation elimination followed by the storage of uric microcrystals. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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