Showing papers in "Journal of Insect Physiology in 1983"

TL;DR: Results prove that moult inhibition is due to an interference with the endocrine system rather than to the altered feeding behaviour, and inhibition of eclosion processes suggest a wide-spread blockage of factors presumably located in the central nervous system.

TL;DR: It was concluded that an ecdysteroid decline is a normal prerequisite for the ecdyses of both stages of Manduca sexta and the dual action of the declining ecdySTERoid titre insures that when eclosion hormone is released, the tissues will be competent to respond to it.

TL;DR: Comparisons of 20-hydroxyecdysone with other phytoecdysteroids in the silkworm and pink bollworm show a similar but more potent effect induced by ponasterone A, while cyasterone causes an ‘antiecdysone’ effect.

TL;DR: The model of a mechanism by which juvenile hormone could control determination of worker castes in Pheidole bicarinata is expanded and a high dose of methoprene produces a metamorphic delay and large soldiers, while the lowest effective dose produces early metamorphosis and small adults.

TL;DR: Monitoring of the fate of various doses of bacteria of different pathogenicities injected into Galleria mellonella larvae showed that phagocytosis is the primary cellular defence reaction of this insect for doses ofacteria below ca.

TL;DR: Pheromone production in the housefly was monitored during oogenesis and in ovariectomized insects by gas-liquid chromatography (GLC) and radio-GLC.

TL;DR: The critical daylength for the induction of adult (ovarian) diapause in Pyrrhocoris apterus (central Bohemian population) was found to be 15.75 hr per 24 hr, whereas the need for photoperiodic termination was abolished after 12–16 weeks at 4°C.

TL;DR: Continuous cell cultures were established from imaginal wing discs of 2 Lepidoptera, Spodoptera frugiperda and Plodia interpunctella, finding that these cells respond morphologically and biochemically to the insect hormone, 20-hydroxyecdysone.

TL;DR: Estimates of weights of fatty acids in spermathecae from virgin and mated T. commodus indicate substantial elevation in all fatty acids and particularly arachidonic acid following mating, which is the highest recorded for this fatty acid in the insect literature.

TL;DR: The fate of some male secretions in the female and their physiological importance in the control of the female reproductive function were analysed in the present work.

TL;DR: Intracellular recordings combined with iontophoretic injection of Procion Yellow M4RAN were used to study the anatomy and physiology of the centrifugal horizontal cells (CH-cells) in the lobula plate of the blowfly, Phaenicia sericata.

TL;DR: It is concluded that NCC II controls the release of adipokinetic hormones during flight and that two adipkinetic hormones are released during flight.

TL;DR: In this article, the temporal organization of secretion of Prothoracicotropic hormone (PTTH), ecdysone and juvenile hormone was studied with particular attention to the circadian control of the timing of hormone release.

TL;DR: A hypothetical model for the regulation of the juvenile hormone titre as well as the course of labour division is proposed by the varying microclimates observed in the bee hive.

TL;DR: Observations from thin-layer chromatography and high-pressure liquid chromatography combined with radioimmunoassay as well as gas chromatography-mass spectrometry suggest that the follicle cells are the site of ecdysteroid biosynthesis and of C-20-ecdysone hydroxylation in adult females from different species.

TL;DR: It was concluded that the haemolytic factor is a peptide displaying a basic character that was found in the crop of all larval stages and adult Rhodnius prolixus.

TL;DR: Implantation experiments indicated that the effect of juvenile hormone is not mediated through the isolated brain or subesophageal ganglion, and was found to be directly induced by juvenile hormone.

TL;DR: When the larvae were reared on a diet containing weakly nutritive proteins such as gluten and zein, haemolymph protein was decreased and uric acid excretion was markedly accelerated, and the amino acid patterns in the ha Hemolymph were greatly changed according to supplementation.

TL;DR: The fates of the maternal conjugates were followed during embryogenesis in the eggs of Locusta migratoria and a model for the sequences of metabolic events leading from maternal ecdysteroid Conjugates to the embryonic Ecdysteroids is proposed.

TL;DR: It is suggested that A yellow is an integral component of the A + lipoprotein complex, whereas C L -proteins may play only a relatively minor part in its structural organisation.

TL;DR: Phototactic responses to monochromatic lights of different wavelengths but equivalent intensities were tested in an apparatus which permitted the simultaneous presentation of pairs of lights to groups of flies.

TL;DR: Changes in haemolymph proteins and lipoproteins during adipokinetic hormone action have been studied using polyacrylamide gel electrophoresis (PAGE) and a heparin/EDTA precipitation technique and are dose-dependent.

TL;DR: The results support the hypothesis that digestion starts in the endoperitrophic space under the action of amylase and trypsin and is largely completed in the ectoper itrophic space through the catalytic action of several oligomer and dimer hydrolases.

TL;DR: Aphids of Schizaphis graminum (Rondani) (biotype C) reared on its host-plant, Sorghum bicolor (L.) Moench, sequestered campesterol, stigmasterol and sitosterol contained both [ 14C]-sitosterol and [14C]-cholesterol, indicating that these aphids are capable of dealkylation at C-24.

TL;DR: It is suggested that the elevation in haemolymph lipid during the first 10 min of flight may not be induced by adipokinetic hormone I or II, and the role of octopamine in this initial elevation is proposed and discussed.

TL;DR: It is suggested that 20-hydroxyecdysone acts on ecdysteroid production as a negative-feedback regulator and since 20-HydroxyECDysone elicits inhibition in headless pupae, it is suggested it acts directly upon the prothoracic glands.

TL;DR: Pheromones and metabolites of host compounds were found in association with the hindgut of both naturally fed and of non-fed, host vapour-exposed bark beetles, Ips paraconfusus and Dendroctonus brevicomis and revealed that immature adults do not produce the pheromone components, ipsenol and ipsdienol, as mature adults do.

TL;DR: A methanol-soluble oviposition deterrent has been discovered in the frass of fifth-instar larvae of Ostrinia nubilalis, the European corn borer, indicating a low volatility.

TL;DR: Based on data gleaned from several research groups the identification of juvenile hormone III as the exclusive juvenile hormone in the Order Orthopteroidea is discussed.

TL;DR: It is demonstrated that the kinetics of uptake of these plant phenolics into the haemolymph of 5th-instar Heliothis zea (Boddie) following actue oral administration is a first-order process.