Showing papers in "Journal of Insect Physiology in 1977"

TL;DR: At the end of each ovarian cycle, egg-laying corresponds to the disappearance of ecdysteroids from the female insects, the hormonal molecules can easily be recovered from the eggs.

TL;DR: It is proposed that when the male transfers several spermatophores during copulation, he may make a significant contribution of protein to the developing oocytes.

TL;DR: Post-copulatory PG biosynthesis in the female reproductive tract might be partially responsible for triggering oviposition in A. domesticus .

TL;DR: Near normal growth of follicles in isolated abdomens after topical application of juvenile hormone (JH) indicates that the thoracic factor is JH from the corpora allata and demonstrates the feasibility of using this system as a JH assay.

TL;DR: Vitellogenin synthesis can be induced very quickly in adult male Sarcophaga bullata starting from 3 days after emergence by injection of a dose of ecdysterone, apparently derepresses in some way the viteLLogenin gene or m-RNA in males.

TL;DR: When implanted into the haemocoel of the wax moth, Galleria mellonella, fragments of nerve cord from the locust Schistocerca gregaria were shown to be encapsulated by host haemocytes, in a two phase system.

TL;DR: It appears that the effect of prococene on the CA is irreversible, and a number of disintegrating nuclei, degenerating mitochondria, lysosome-like bodies and autophagic vacuoles are revealed.

TL;DR: The significance of MH and JH titers as related to the endocrine regulation of development is discussed in the light of this finding.

TL;DR: It is proposed that alkali metal transport across the midgut epithelium of these phytophagous Lepidoptera occurs via energy-linked processes not requiring Na+K+-ATPases.

TL;DR: There are four major protein species in the haemolymph of the late 3rd instar of Drosophila and the function of these proteins and their suitability as systems for the study of gene control and protein synthesis in Drosophile are discussed.

TL;DR: Nine representatives of six orders of insects were extracted and partially processed by means used in the recent isolation of proctolin, a pentapeptide transmitter candidate in insects, and each yielded a substance with pharmacological activity on cockroach proctodeal muscle similar to that of Proctolin.

TL;DR: It can be suggested that a queen inhibits egg maturation in workers by suppressing the JH production in the corpora allata and thus lowering theJH titer, which enables a queen to block oogenesis once stimulated, for instance in queenless workers.

TL;DR: Electroantennogram studies using the differential receptor saturation technique suggest the existence of one receptor type having greatest affinity for (+)-disparlure and another type having greater affinity for the olefin and (−)-dis parlure.

TL;DR: Evidence, in conjunction with the above results, suggests that PTTH release potentiates prothoracic gland function in the diapausing pupa which is then regulated by a temperature dependent process.

TL;DR: Differential adaptation of antennal olfactory acceptors and electroantennogram techniques were used to describe the acceptor population for pheromones and host compounds and all acceptors appeared to have some degree of specificity for the phersomone, frontalin.

TL;DR: Neuronal tissues from Manduca sexta, the tobacco hornworm, Hyalophora cecropia, the silkmoth and Danaus plexippus contain Na+K+-ATPase which is sensitive to cardiac glycoside (ouabain), and at least part of the physiological burden incurred in utilization of cardiac glyCoside ingestion and storage for protection from predation is probably related to the toxic effects of cardiac sugars on neuronal Na+

TL;DR: Ecdysone haemolymph peaks should be considered as periods where ecdysone levels are above a threshold value, and the observed situation is very similar to that of Manduca sexta.

TL;DR: Some diapause characteristics were studied in a strain of the spider mite, which had been reared on bean plants in the laboratory for over 15 yr, showing a remarkable similarity with the results obtained in light break experiments with some species of insects.

TL;DR: All species investigated appear to be more responsive to their own pheromone than to those produced by other species, including Tomocerus minor.

TL;DR: It is proposed that protein incorporation is affected by the stability of the protein in the matrix such that unbound protein tends to inhibit the addition of further protein.

TL;DR: The dynamics of sugar production by flowers and the foraging activity of honey bees were analysed and oscillations of the gathering flow are due to a behavioural aspect of the bees, i.e. “floral fidelity”.

TL;DR: Myogenic slow contractions of the extensor tibiae of Locusta migratoria can be induced by proctolin in a concentration of 10 −10 to 10 −9 mole per liter perfusion fluid, apparently causing a prolonged contraction interrupted by rhythmical relaxations.

TL;DR: The results show that chitin is removed to a sufficient extent for the structural coherence and optical properties of the cuticle to be dependent on the proteins.

TL;DR: The results have been obtained indicate that the position of the fly's head has a substantial influence on the magnitude of the turning tendencies elicited by visual stimuli.

TL;DR: Broad bandwidth physical gold and silver cuticular interference reflectors were studied with a microspectroscope and the diversity of golds and silvers is discussed with reference to location of layers responsible, tanning, pigments, extracellular pH control, cuticular hydration, and possible defence mechanisms.

TL;DR: The hypothesis is advanced that a JH-induced break or termination of diapause is mediated through the neuroendocrine system.

TL;DR: A quantitative comparison of three motor rhythms involving the legs of the cockroach Periplaneta americana finds close similarity among rhythmic leg movements and motor outputs among these three behaviors requires a reassessment of earlier work on the central oscillatory system for walking in this species.

TL;DR: Four distinct stages of diapause development in pupae of Mamestra configurata held at 20°C can be recognized by means of the ‘β-ecdysone sensitivity index’, which may signal the transition of the endocrine system to its active state.

TL;DR: It is argued that glycolytic flux is reduced (when lipid oxidation is favoured) at a point before the formation of triose phosphates; perhaps at the aldolase reaction.

TL;DR: The results demonstrate that the control of prothoracic glands is a complex process governed by the nervous integration of various stimuli.