Showing papers in "Journal of Insect Physiology in 1994"

TL;DR: Differences in the performance of two out of five of the pea aphid clones could be explained by a part of the amino acid composition.

TL;DR: It was demonstrated that parasitoid can use both flower-odors and -colors during food foraging, and the response of parasitoids to food-indicating stimuli depended on the hunger state of the individual.

TL;DR: Observations indicate that multicystatins such as PMC may be effective cystatins for use in controlling larvae of Diabrotica species in transgenic plants.

TL;DR: It now appears that some of the mechanisms by which bees analyse visual patterns may not be very different, qualitatively, from those known to exist in the cortex of higher vertebrates.

TL;DR: Host-seeking behavior was inhibited by Aea-HP-I within a dosage range of 16.5–825 pmol/female, whereas related peptides differing by a few amino acids had no effect.

TL;DR: Heat shock, cold shock and indirect chilling injury did not interfere with the continuation of pharate adult development in the flesh fly, Sarcophaga crassipalpis, but such flies failed to eclose properly when the exposure was of sufficient duration, suggesting that neuronal damage is the likely cause of injury inflicted by cold shock.

TL;DR: The behavioural phase status of hatchling Schistocerca gregaria Forskal has been quantified using logistic regression, following treatments in which maternal and paternal phase, density during mating and oviposition, and nymphal rearing density were varied.

TL;DR: The failure of diapausing hosts to respond to envenomation by redirecting metabolism may account for the lower production of adult parasitoids on such hosts.

TL;DR: A spontaneous daily rhythm of aggregation/dispersion was demonstrated from the 6th day after feeding onwards andMaxima of assembling and dispersion occur at the onset of the photophase and scotophase, respectively.

TL;DR: Both, the stimulatory effect of octopamine and the presence of immunoreactive nerve fibers in the corpora allata, strongly indicate a physiological role of this biogenic amine in the regulation of juvenile hormone biosynthesis in adult honey bees.

TL;DR: The biosynthesis of prostaglandins and other eicosanoids and their roles in insect physiology, which include releasing egg-laying behavior in certain insects, mediating cellular immunological responses to bacterial infections, regulating epithelial ion and water flux in mosquito Malpighian tubules, and regulating temperature set points in desert cicadas are outlined.

TL;DR: It is proposed that octopamine is a bifunctional molecule acting as both a modulator of haemocyte activity and mediating bacterial attachment to haemocytes.

TL;DR: Insect yolk protein systems provide a suitable system for studying regulation of cellular proteinases, since yolk proteins (substrate of proteinases) are purified and characterized.

TL;DR: Constant temperature and thermoperiod were shown to be additional factors which interact with photoperiod to induce diapause to Sesamia nonagrioides, and first and second larval instars were the most sensitive to diAPause induction by photoperperiod.

TL;DR: The shortening of circadian period in perS and its lengthening in perL2 were shown to be consequences of changes in the ‘time course’ of the oscillation in the late subjective day.

TL;DR: The recent work with western corn rootworm beetles implicates a γ-aminobutyric acid (GABA)/glycine receptor in the perception of phago-stimulants and -deterrents and the merits of this ligand-gated receptor model for chemoreception of ‘sweet’, ‘bitter’ and other taste classes will be contrasted with those proposed from vertebrates.

TL;DR: Octopamine-induced increase in juvenile hormone production could not be reversed by washing out the biogenic amine, suggesting a longterm irreversible effect directly on corpora allata cells, possibly via cAMP.

TL;DR: Increased triglyceride biosynthesis may require a concomitant decreased biosynthesis of non-triglycerides, and carbohydrate concentration was higher in the SW morph during early adulthood, compared to the elevated triglyceride level in the LW morph.

TL;DR: Exposure to chilling temperatures eventually depleted the energy reserves, but the highest concentrations of triacylglycerols and proteins were observed at the acclimation time with the highest T cs, suggesting that systemic regulation in these energetic reserves may be an important part of the cold-hardening mechanisms to cope with the fluctuations of low temperatures causing cold-shock or chilling injury.

TL;DR: Organ implantation into albino hoppers revealed that the corpora cardiaca and brain of normal solitary hoppers contained this neurohormone as did those of normal gregarious hoppers, and this dark-color inducing factor seems to be a heat-stable neuropeptide.

TL;DR: The addition of farnesol along with octopamine to the medium overcame the inhibitory effect ofoctopamine and allatostatin-1 of JH III synthesis, which indicates that these CA-inhibiting factors were blocking an early step in JHIII synthesis.

TL;DR: This is the first report of rapid cold-hardening in Lepidoptera, and the capacity to rapidly cold-harden may protect monarchs against cold injury during diurnal changes in temperature, as evidence that the monarch butterfly is a freeze-susceptible insect.

TL;DR: Arctic springtail Onychiurus arcticus possesses ecophysiological characteristics suited to life in the upper layer of soil and surface vegetation, and beneath snow cover, but appears to be poorly adapted to survive severe winter temperatures being intolerant of freezing and with little supercooling ability.

TL;DR: Southern blot experiments showed that the gene for diapause protein 1 occurs only once in the haploid genome of the Colorado potato beetle, which suggests that the protein is an arylphorin-type storage hexamer.

TL;DR: Virgin queens treated topically with the juvenile hormone (JH) analogue, methoprene, dealated and developed their ovaries in the presence of the pheromone (queen), suggesting that the phersomonal mode of action involves the suppression of JH titers.

TL;DR: Two-way combinations of protease inhibitors caused significant mortality and reduced growth as effectively as the best single inhibitors at all dietary casein levels.

TL;DR: An in vitro microscopic fluorescence assay determining the phagocytic activity of isolated plasmatocytes of Galleria mellonella was developed to quantify insect cellular immune reactions and is highly reproducible and easy to perform.

TL;DR: It is hypothesize that GLD participates in strengthening the encapsulation and in the killing reaction, via reaction with quinones generated by phenoloxidase and subsequent production of free radicals in fourth instar Manduca sexta larvae.

TL;DR: Pupae and pharate adults of Sarcophaga bullata parasitized by the ectoparasitoid, Nasonia vitripennis, either died immediately or entered a developmental arrest, and either a factor in the head region is detrimental to parasitoid development or some aspect of the abdomen promotes parasitoids development.

TL;DR: It is concluded that integument peptides are not secreted only by the epidermis, nor is the cuticle their only destination.