Abstract:
:The elements Na, Cl and K are distributed heterogeneously in the larval cells of the four Malpighian tubules of Drosophila hydei. Elemental gradients are steeper when they are related to the dry weight in comparison to the weight of water. The high contents of Na, Cl and K in the cytoplasm close to the basal plasma membrane differ significantly from the low values found in the neighboring basal "labyrinth" and in the intermediate cytoplasm. Elemental contents (K, Cl) increase from the intermediate cytoplasm to the apical microvilli and further to the lumen. The K/Na-ratio changes across the cells from 0.9 in the hemolymph to 2 in the basal cytoplasm close to the plasma membrane, to 27 in the microvilli, and 89 in the fluid phase of the lumen. In the lumen, K is accumulated in proteoglycan containing type-II concretions. The water content increases from the distal to the proximal segments of anterior and posterior tubules.
journal_name
Cell Tissue Resjournal_title
Cell and tissue researchauthors
Wessing A,Zierold Kdoi
10.1007/BF00318555subject
Has Abstractpub_date
1993-06-01 00:00:00pages
491-7issue
3eissn
0302-766Xissn
1432-0878journal_volume
272pub_type
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