Showing papers in "Journal of Insect Physiology in 1993"

TL;DR: This review brings the reader up to date with both pure and applied research in the field and provides a detailed overview of present thinking into the mode of action of azadirachtin.

TL;DR: The physiology, morphology and distribution of pheromone receptors on the antennae of both sexes of Spodoptera littoralis Boisd were investigated by electroantennogram screening, single sensillum recordings and scanning electron microscopy.

TL;DR: Salivary and intestinal proteolytic enzymes were studied in the predaceous heteropteran, Zelus renardii as discussed by the authors, with hemoglobin, BApNA, BTNA, HPLA, HA and LPNA used as substrates.

TL;DR: The relative effectiveness of the inhibitors in vitro is in agreement with previous data showing that SBTI was a more effective inhibitor of the H. armigera trypsin-like gut protease in vitro.

TL;DR: Oviposition in Spodoptera littoralis was strongly deterred by a mixture of six compounds, benzaldehyde and the five terpenes carvacrol, eugenol, nerolidol, phytol and thymol, identified from conspecific larval frass.

TL;DR: Four primary similarities were noted in diet utilization regardless of leafhopper species, host species or sex: excretion of ammonia as the primary waste product; high efficiency of conversion for all organic compounds ingested from xylem fluid; high daily feeding rates (100–300 times dry body weight per day); adjustment of feeding rates to diurnal fluctuations in xyleM fluid chemistry.

TL;DR: This is the first report of nutrient avoidance as a resistance mechanism and of aversion to this typically phagostimulatory molecule recognized as the universal metabolic fuel.

TL;DR: The N-terminal 7 amino acids are not needed for sex-peptide function, whereas the disulfide bridge appears essential, and all results are consistent with the assumption of only one target molecule for both reactions which is accessible via hemolymph.

TL;DR: Shift in food preference and sex-specific variations in preference for protein and lipid likely reflect changing nutrient demands and fundamental physiological differences during insect ontogeny.

TL;DR: It is proposed that the tympanal receptors are a special part of a general chordotonal system in which homologous peripheral receptors project to sets of homologicous interneurons.

TL;DR: It is shown that progressive dilution of filtered calyx fluid separates the effects of polydnavirus on host immunity and development, and very small doses of virus disrupt development many days following PDV injection, while relatively larger doses are needed to block encapsulation within a short time-frame following parasitization.

TL;DR: Evidence for the various channels, carriers and pumps thought to be involved in the transport of K, Na, H and Cl ions is discussed, and rapid advances are anticipated when synthetic diuretic peptides become available for electrophysiological studies.

TL;DR: Flight muscle development and flight muscle development may explain the lower fecundity during the early stage of adult life in intact long-winged vs de-alated or short-Winged crickets.

TL;DR: Independent of glucose concentration, workers require more sugar per metre flown and gram body weight, and per gram thorax weight, than the much heavier drones and queens, and Queens have the most economical flight.

TL;DR: The results suggest that queen/worker caste differentiation may be more strongly fixed during development in some honey bee races than in others.

TL;DR: An unusual response of fat body cells to freezing is the coalescence of intracellular lipid droplets upon thawing, which increases with decreasing temperature and increasing duration of exposure, but decreases with the addition of glycerol to the media.

TL;DR: The gene (or genes) controlling differences in dopamine content under normal conditions is located on the X-chromosome, and the gene(s) controlling the differences in responsiveness of the dopamine system to stress was found to be autosomal.

TL;DR: Ice nucleating active microorganisms can regulate the supercooling capacity of insects when ingested or applied topically and may offer a novel means for the biological control of insect pests during the winter.

TL;DR: Neither larval competition nor protein availability for vitellogenesis appear to be significant limiting factors for L. sericata in the field, according to a combination of measurement of pteridine levels in the head and oocyte length.

TL;DR: Data are presented to support the hypothesis that the signal functions by switching off the release of pheromone biosynthesis-activating neuropeptide, or a like neuropePTide from the corpora cardiaca.

TL;DR: Fifth-instar nymphs of Locusta migratoria exhibited regulatory feeding for salt by defending an “intake target” for salt vs non-mineral nutrients when challenged with a range of choices of artificial foods varying in salt content.

TL;DR: Electroantennograms enhanced by novel computer techniques helped to explain not only the larger EAGs recorded from male antennae, but also the observed synergism of the female pheromone by green leaf volatiles.

TL;DR: The presence of allatostatin-immunoreactive material in the haemolymph suggests a humoral pathway for the action of these compounds, in addition to a nervous pathway from the brain.

TL;DR: Adult female Culex quinquefasciatus were fed blood and maintained either on sugar or on water for 5 days and allowed to oviposit, and egg rafts, placed in a few drops of water, were analyzed immediately after oviposition and after hatching.

TL;DR: It is confirmed that diapause hormone is responsible for both the induction of embryonic diAPause in laid eggs as well as the stimulation of trehalase activity in developing ovaries of silkworms.

TL;DR: The results suggest the presence of at least two receptor types for FMRFamide-related peptides, one receptor type leads to inhibition of contraction whereas the other leads to stimulation of contraction.

TL;DR: Using several different experimental approaches, it is shown that the discontinuous ventilation cycle (DVC) in the arid-adapted ant Cataglyphis bicolor is of the passive suction ventilation (PSV) type.

TL;DR: The results indicate that the lower part of the fruits tested has greater quantities of solute and sugars and therefore may have better nutritive value and it is not clear if the females prefer to oviposit in thePart of the fruit which is more adequate for the larvae.

TL;DR: Topical applications of fenoxycarb on virgin females of Agrotis ipsilon induced a precocious onset of calling and mating behaviour, accelerated ovarian development and oviposition, and the role of juvenile hormone in the control of sexual behaviour and reproduction of A. ipilon is discussed.

TL;DR: The CTMax of pigmented major and minor workers and unpigmented larvae of Hodotermes mossambicus (Hagen) from laboratory colonies range between 43.5–48.53°C while the CTMin range between 5.3–10.31°C over a range of acclimation temperatures between 15 and 35°C.