By Peter Evans

Advances in Insect body structure is dedicated to publishing eclectic volumes containing accomplished and in-depth experiences on all elements of insect body structure. First released in 1963, it truly is a necessary reference resource for invertebrate physiologists and neurobiologists, entomologists, zoologists, and bug biochemists. In 1999, the Institute for medical info published figures displaying that Advances in Insect body structure has an impression issue of 4.5, putting it moment within the hugely aggressive type of Entomology. Key beneficial properties * This quantity contains 5 experiences at the following themes: * The Drosophila melanogaster Malpighian tubule * Plasticity within the insect anxious procedure * impartial amino acid absorption within the midgut of lepidopteran larvae * The unpaired median neurons of bugs * FMRFamide comparable peptides: a multifunctional family members of structurally similar neuropeptides in bugs

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A. DAVIES transport of the cationic dye rhodamine 123 was observed (Meulemans and De Loof, 1992). In vitro, the principal cells were transiently labelled, but the lumen of the stellate cells was subsequently stably labelled. In vivo, however, principal cells were more consistently labelled, particularly in the initial segment, where concretion bodies ultimately took up ¯uorescent label. By contrast, the story seemed similar for Calliphora and Drosophila, where stellate cells were labelled (Meulemans and De Loof, 1992).

Although it is undoubtedly the case that some chloride will ¯ow paracellularly, several lines of evidence in Drosophila have implicated the stellate cell as a major transcellular route for chloride. , 1998). First, the calculation that the tubule main segment, when maximally stimulated, is capable of secreting its own volume of ¯uid every 10 s is hard to reconcile with paracellular ¯ux through an epithelium with elaborate septate junctions, which are thought to offer a permeability barrier comparable with tight junctional epithelia of vertebrates.

1998). , 1995) and Aedes (O'Connor and Beyenbach, 2000). , 1998). This invited speculation that chloride channels might be con®ned to stellate cells. 26 J. A. T. DOW AND S. A. DAVIES Powerful evidence to support this theory came from the use of vibrating probes (now renamed self-referencing electrodes, to spare blushes), that allow ion ¯ux to be inferred by measuring tiny perturbations in the electrical ®eld surrounding a tissue. Chloride current hotspots were con®ned to the main, ¯uid-secreting, portion of the tubule, and invariably mapped to stellate cells (Fig.

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