Showing papers in "Journal of Insect Physiology in 2005"

TL;DR: Cold selection resulted in PLFA changes, which may improve the ability to harden during RCH, which is consistent with the membrane response typically found during cold acclimation in ectothermic animals and likely adaptive to maintain membrane function during cold.

TL;DR: The ovary transplant experiments corroborate the endocrine results and demonstrate that insulin/insulin-like signaling (IIS) is necessary for vitellogenesis even when sufficient levels of JH, ecdysteroids or other factors are present.

TL;DR: This study suggests a distinct sequence in the pattern of gene expression at the onset of diapause, but the genes monitored do not contribute to the switch to covert developmental potential at the transition from diAPause to post-diapause quiescence.

TL;DR: Results indicate that Hsp90 may serve as an early marker to predict diapause termination in this species, and genes encoding heat-shock protein 23, Hsp70 and HSp90 were cloned from Lucilia sericata to examine whether their expression is related to the regulation of its larval diappause.

TL;DR: Interestingly, changes in the lamellocyte morphology were also observed following injection of the P4 protein, a major component of L. boulardi female long glands that displays a strong immune suppressive effect on Drosophila larvae.

TL;DR: A scanning electron microscopic study of the antennae of both sexes supported an earlier study, apart from that long s.trichodea were present in a wreath at the proximal margin of the flagellomere and in addition evenly distributed over the remaining surface, and a previously non-described sensillum type with external basiconic features was revealed.

TL;DR: The effects of temperature acclimation on thermal tolerance, desiccation rate and metabolic rate for adult Chirodica chalcoptera collected from Protea nerifolia inflorescences in the Fynbos Biome in South Africa are reported and climate change for the region could have effects on this species, in turn possibly affecting local ecosystem functioning.

TL;DR: Measurements revealed possible cyclic respiration patterns, including low respiratory quotient (RQ) values during February and March and a transition during April to more continuous respiration with elevated RQ values.

TL;DR: There is growing evidence that male reproductive effort is more complex than has traditionally been thought, and the cost of reproduction for males has been studied much less than that in females.

TL;DR: The electroretinogram of alate female summer migrants of M. persicae is measured to contribute to the understanding of the perception of visual stimuli in this species and concludes that M. Persicae has three spectral types of photoreceptors.

TL;DR: Assays showed that digestive proteolytic activity of larvae and adults of Aphelinus abdominalis predominantly relies on serine proteases and especially on chymotrypsin-like activity, and the potential impact of PI-expressing plants on aphid parasitoids and their combined efficiency for aphid control are discussed.

TL;DR: The findings indicate that induction of stress genes regulated by HSF, such as Hsps, although occurring following LTCA, are not of major importance for cold stress resistance and neither for RCH nor high-temperature knock-down resistance in D. melanogaster.

TL;DR: In this paper, the effects of different adult diets on female reproduction in the tropical, fruit-feeding butterfly Bicyclus anynana (Nymphalidae) were investigated.

TL;DR: In this paper, the recovery time of the common woodlouse (Porcellio laevis) exposed to different thermal conditions was investigated and significant differences were found in recovery time among experimental temperatures and among populations, but no interaction between these factors.

TL;DR: In this paper, the authors measured the levels of ecdysteroids in hemolymph and ovaries of queens and workers in B. terrestris colonies and found that workers had higher levels of the hormone than queens.

TL;DR: The results suggest that L. victoriae is likely to promote immune suppression by an active mechanism that is mediated by VLPs, similar to that used by L. heterotoma.

TL;DR: expression of the circadian rhythm gene timeless was investigated in the pitcher-plant mosquito, Wyeomyia smithii, and was found to vary with time of day, instar of diapause, and latitude of origin, suggesting that it has the potential to affect photoperiodic response and its adaptive evolution in temperate seasonal environments.

TL;DR: In this paper, the salivary glands of Nephotettix cincticeps were characterized, its activity as a laccase, and its presence in the watery saliva with the objective of understanding its function in feeding on rice plants.

TL;DR: It is suggested that both oscillatory and hourglass-like properties are to be seen in insect photoperiodism, and the differences between the two apparently conflicting models may be resolved if, following Bünning, "hourglasses" are regarded as damping circadian oscillators, with the more self-sustained and more highly damped responses being parts of a continuous series.

TL;DR: Results are consistent with a role for PTTH in the regulation of diapause in this species, and Immunocytochemical results revealed that Hearm-PTTH is localized in two pairs of dorsolateral neurosecretory cells within the brain.

TL;DR: Understanding the seasonal relevance of the photoperiodic responses is more important than revealing any possible involvement with circadian systems.

TL;DR: It is suggested that the use of both organs by females results in sperm economy, which adaptively prolongs the intervals between copulations, and both the spermathecae and the fertilization chamber are active sperm storage organs.

TL;DR: It is suggested that larvally derived lipid stores may be more important to adult fitness than carbohydrate or protein stores, and this difference is likely due to variation in the relative availability of protein in adult diets across species.

TL;DR: It was concluded that the control of morphogenesis of primary reproductives (Form Is) depends on a low level of MF prior to the molt, while Form IIs are formed in the presence of increased levels of MF.

TL;DR: Four-fold reduction in survival time within dry air and accelerated water loss rates with high activation energies for female adults of the closely related winged Prostephanus truncatus suggest that the enhanced water conservation of spider beetles is due, in part, to fusion of their elytra supplemented by entering into quiescence.

TL;DR: The silkworm Bombyx mori requires 2-3 months of low temperature (5 degrees C) to terminate embryonic diapause and both yolk cell dissociation and embryonic development are inhibited by MAPK-ERK kinase (MEK) inhibitor U0126, suggesting that ERK in yolk cells has a role in regulating changes in yolks morphology and termination of embryonic diAPause in B. mori.

TL;DR: The role of Spn27A in the melanization cascade is confirmed and it is established that this pathway and associated blood cell responses can be activated by parasitization.

TL;DR: The data obtained suggest ecdysone control of JH metabolism mediated via DA in Drosophila virilis females of wild type and a mutant, with increased 20E level and decreased fertility, under normal and nutritional stress conditions.

TL;DR: It is concluded that the aphid gut sucrase activity is essential for osmoregulation of aphids ingesting food hyperosmotic to their body fluids.

TL;DR: Repeated cooling of individual springtails five times resulted in very similar freezing points suggesting that ice nucleation in this freeze-susceptible species is likely to be initiated by intrinsic factors rather than being a stochastic event.