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Organization, origin and function of the outer microvillar (perimicrovillar) membranes of Dysdercus peruvianus (Hemiptera) midgut cells
The data suggest that perimicrovillar membranes are formed in Golgi areas, migrate as the internal membrane of double membrane vesicles, and finally fuse at the cell apex—the outer vesicle membrane with the microvillar membrane and the inner vesic membranes with the perim MicroVillar membrane. Expand
Midgut adaptation and digestive enzyme distribution in a phloem feeding insect, the pea aphid Acyrthosiphon pisum.
The data suggest that the anterior midgut is structurally reinforced to resist osmotic pressures and that the transglycosylating alpha-Glu, together with CP and APN are bound to MPM, thus being both distributed over a large surface and prevented from excretion with honeydew. Expand
The cathepsin L-like proteinases from the midgut of Tenebrio molitor larvae: sequence, properties, immunocytochemical localization and function.
The data suggest that only Coleoptera have digestive CALs that may originate by gene duplication and independent evolution relative to the gene encoding the lysosomal enzyme. Expand
Occurrence of midgut perimicrovillar membranes in paraneopteran insect orders with comments on their function and evolutionary significance.
The data support the hypothesis that PMM may have originated in the Condylognatha (Paraneopteran taxon including Hemiptera and Thysanoptera) ancestral stock and are associated with plant sap feeding. Expand
Nature of the anchors of membrane-bound aminopeptidase, amylase, and trypsin and secretory mechanisms in Spodoptera frugiperda (Lepidoptera) midgut cells.
Spodoptera frugiperda larvae have a microvillar aminopeptidase and both soluble and membrane-bound forms of amylase and trypsin, although once solubilized in detergent it behaves as a hydrophilic protein. Expand
The larval midgut of the housefly (Musca domestica): Ultrastructure, fluid fluxes and ion secretion in relation to the organization of digestion
It is suggested that the interstitial cells absorb water and the posterior hind-midgut cells secrete water, which results in a countercurrent flux of fluid, which is responsible for the enzyme recovery from undigested food before it is expelled. Expand
The larval midgut of the cassava hornworm (Erinnyis ello)
The results suggest that the anterior and middle region of the midgut absorbs water, whereas the posterior region secretes it and results in a countercurrent flux of fluid, which is responsible for the enzyme recovery from undigested food before it is expelled. Expand
The peritrophic membrane of Spodoptera frugiperda: secretion of peritrophins and role in immobilization and recycling digestive enzymes.
Calcofluor-treated larvae lacking a PM were shown to lose the decreasing gradient of trypsin and chymotrypsin observed along the midgut of control larvae, thought to be formed by a countercurrent flux of fluid. Expand
Functional characterization of the thi1 promoter region from Arabidopsis thaliana.
The Arabidopsis thaliana THI1 protein is involved in thiamine biosynthesis and is targeted to both chloroplasts and mitochondria by N-terminal control regions. To investigate thi1 expression, aExpand
Gynandromorphism in Amblyomma cajennense and Rhipicephalus sanguineus (Acari: Ixodidae)
In another survey on dogs in March 2001, in the urban area of Monte Negro, Rondônia, Brazil, a gynandromorph of Rhipicephalus sanguineus was collected from a naturally infested dog and both specimens are described and classified as perfect bipartite protogynanders. Expand