Showing papers in "Journal of Insect Physiology in 1973"

TL;DR: The stability of the maxima within the scotophase is inconsistent with the ‘coincidence’ models of photoperiodic timing that have been proposed and it is suggested that the essential timing process operates on the hour-glass principle.

TL;DR: Ovarian follicles of Aedes aegypti normally pass through a potential stage of arrest 1 day after adult ecdysis and after blood feeding, but follicles that ceased development as a result of allatectomy or decapitation respond to these oogenic stimuli, but degenerate without depositing yolk.

TL;DR: Haemolymph from fifth instar Manduca sexta larvae reared on an artificial diet had ion levels very close to those in Cecropia similarly reared, but showed some quantitative differences from the other species.

TL;DR: In vivo and in vitro studies revealed two additional metabolites produced by tissue homogenates in the presence of NADPH that are tentatively identified as the JH-tetrol metabolite in Cecropia, Thermobia, and Drosophila, and theJH-bisepoxide in Drosphila.

TL;DR: From a survey of 30 species and varieties of ladybugs the presence of alkaloid appears to be correlated with the existence of aposematic colour and not with being carnivorous or phytophagous, but all the beetles containing alkaloids do not possess the same degree of protection.

TL;DR: A new bioassay which is sensitive to less than 0·01 ng (3 × 10−14 moles) of topically applied hormone and requires only 2 days to work was developed.

TL;DR: The findings suggest that the initiation and maintenance of diapause are regulated by juvenile hormone titre, and that larvae retain a high titre of juvenile hormone until the last stages of diAPause.

TL;DR: It is concluded that both gustation and olfaction are important for host plant discrimination and these chemosensory organs were also shown to play a strong role in the induction of preference.

TL;DR: Larval cultures of the flesh-fly were raised in experimental light cycles with periods (T) of 21 to 72 hr, each cycle containing a photoperiod of 4 to 20 hr of white light, and this ‘resonance’ technique revealed periodic maxima of pupal diapause, thereby demonstrating an endogenous circadian component in the Photoperiodic clock.

TL;DR: In laboratory·bioassays gravid female codling moths were stimulated to oviposit by natural α-farnesene, which is comprised of ( E,E )- α- and ( Z,E)-α-Farnesenes, and by synthetic (E,E ).

TL;DR: Cicadas feed on xylem fluid which is hypotonic to the haemolymph and contains high concentrations of potassium, sodium, calcium, magnesium, chloride, and phosphate ions, and traces of amino acids are also found in urine.

TL;DR: A developmental time-table has been established for the embryos of viviparous Diploptera punctata and it is suggested that before dorsal closure lipid is the major energy source for development.

TL;DR: Microinjection of radioactive tyrosine, dopa, and dopamine into mature larvae of Drosophila revealed that the sclerotization pathway is similar but not identical to that in Calliphora.

TL;DR: During the period between feeding and ecdysis in the fourth instar larva of Rhodnius the basement membrane below the epidermis of the abdomen increases about threefold in thickness.

TL;DR: A new stridulatory apparatus on the last sternite and the eighth segment is described in six female Dendroctonus bark beetles, and elytral files similar to those of males are found on four of these species, which were hitherto believed to be silent.

TL;DR: The intensity of the haemocyte injury reaction in vitro changes systematically during diapause; the nature and significance of the changes are discussed.

TL;DR: In the haemolymph of adult female locusts six different lipoprotein fractions have been demonstrated by means of isoelectric focusing, and one of these binds injected 3 H-Cecropia juvenile hormone.

TL;DR: The results show that the insect synthesizes its branched hydrocarbons, whereas a large part of the normal hydrocarbon fraction can be dietary.

TL;DR: The symbiotes of the pea aphid were found to be coccoid bodies 2 to 5 μ in diameter, gram negative, stained slightly by Fuelgen's, and stained blue by Machiavello's.

TL;DR: In vitro preparations of locust Malpighian tubules can be made by a new technique in which the alimentary canal to which the tubules attach is removed from the insect and set up in Ringer's solution under liquid paraffin, suggesting an active transport of potassium.

TL;DR: 5HT and dopamine can be regarded as transmitter or modulator substances in the CNS, 5HT, dopamine, and noradrenaline, and in the heart.

TL;DR: Femur cuticle from fifth instar larvae of the desert locust, Schistocerca gregaria, has been characterized with respect to composition, rate of deposition, and rate of sclerotization, and the result is that the endocuticle remains untanned in the larvae, whereas in the adults the whole cuticle becomes tanned.

TL;DR: Southern pine beetles collected as they emerged from infested pine bolts and exposed in Petri dishes to α- and β-pinene for 20 hr revealed changes in the volatile contents of the beetles' hindguts detected by gas chromatography, and previously unidentified components were characterized by mass.

TL;DR: Histological and ultrastructural studies on the mycetome of the pea aphid, Acyrthosiphon pisum, disclosed two types of symbiotes: oval in shape and smaller, rod-shaped, and restricted to an apparently syncytial sheath partially enclosing the primaryMycetocytes.

TL;DR: It is suggested that JH, by retarding genetic translation mimics M or bb, affects adult development and eclosion and the pharate pupae were the most sensitive to these agents.

TL;DR: The chitinase activity in the abdominal body walls of isolated abdomens of Bombyx mori larvae was examined and increased by a fivefold factor whenever ecdysterone was injected into the abdomen at a sufficient dose to induce ecdysis.

TL;DR: Experiments show that photoperiod and temperature both affect the development of the ovarian follicles in Culex pipiens pipiens, and a strong interaction between photophase and temperature is evident.

TL;DR: The effects of the implantation of corpora allata are unreliable as estimates of corpus allatum activity as isolated corporaAllata from fifth instar larvae release juvenile hormone, and indirect methods of measuring corpus allata activity are shown to be unreliable.

TL;DR: It is demonstrated that proteins extracted from the cuticle are immunologically similar to the haemolymph carrier proteins.

TL;DR: There is an association between the size attained by alatae and the delay in parturition in aphids reared on certain deficient diets and these amino acids are considered to be essential for normal growth by A. fabae.