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• W1980080913 abstract "The Malpighian tubules of the glow-worm Arachnocampa luminosa are divided into four morphologically distinct regions (Parts 1–4) each comprised of a different cell type (Types I–IV). The ultrastructure of Type II cells is indicative of a transport function. The basal cell surface is highly invaginated and at the apical surface the lumen is lined with microvilli about 80% of which contain mitochondria. Spherites contained in these cells are formed from small vesicles produced by the Golgi apparatus. They have a central uric acid core enclosed by laminations of phosphates of calcium and magnesium. Cells of Part 2 of the tubule secrete a fluid high in potassium (173 mM) and low in sodium (18 mM). The cell is 30 mV negative and the lumen 44 mV positive to the bathing solution. This is consistent with the proposal of an apical cation pump. The secretion produced by Part 2 of the tubules is modified by the Type I cells by the reabsorption of potassium (162 mM) and the addition of sodium (24 mM) to the primary excretory fluid. Type I cells are 20 mV negative and the lumen 22 mV positive with respect to the bathing medium. From ultrastructural observations, Type I cells exhibit features characteristic of transporting cells thought to have an absorptive function. The basal and apical cell surfaces are extensively folded, and mitochondria are found in bands above the basal infoldings and below the microvilli. Mitochondria do not penetrate the microvilli. On comparative grounds, the fine structure of Type I cells suggests that they reabsorb ions from the tubule lumen. Energy for these processes may come from the breakdown of lipids by microperoxisomes contained within these cells. Alternatively, the fluid produced by Part 2 of the tubule may be modified passively by diffusional processes across Type I cells." @default.
• W1980080913 created "2016-06-24" @default.
• W1980080913 creator A5044354171 @default.
• W1980080913 date "1979-01-01" @default.
• W1980080913 modified "2023-10-16" @default.
• W1980080913 title "Regional specialization in the malpighian tubules of the new zealand glow-worm Arachnocampa luminosa (diptera: Mycetophilidae). The structure and function of type I and II cells" @default.
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• W1980080913 doi "https://doi.org/10.1016/0040-8166(79)90024-7" @default.
• W1980080913 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/230612" @default.
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