Showing papers in "Journal of Insect Physiology in 1967"

TL;DR: Although high temperature suppresses the production of alate forms in Megoura, the most significant controlling factor is the degree of crowding, which has been studied by confining aphids in tubes before returning them to the host plant for progeny testing.

TL;DR: The absence of DNA synthesis in most tissues appears to be a fundamental characteristic of diapause and results from the absence of ecdysone.

TL;DR: Interrupted matings, matings with castrate males, and implants showed that loss of sexual receptivity by females after mating was caused primarily by the male seminal fluid, not mechanical stimulation or sperm.

TL;DR: In blood-fed Aedes taeniorhynchus, arrest of egg development by mnc-ablation was reversed by transplantation of 1 pair of mnc from an anaesthetized donor, but transplanted mnc could not restore egg development arrested by allatectomy, and transplanted corpora allata could not restoring eggDevelopment arrested by mNC-ablated.

TL;DR: It is shown that virgin females are much less efficient at converting their meal to eggs than are mated females and the retention of eggs results in a decrease in the size of the blood meal, which is partly responsible for the decrease in egg production among virgin females.

TL;DR: The effects of unilateral tympanotomy, sex, species, and other factors are examined in relation to turning-away behaviour and other responses shown by free-flying moths in response to bats and artificial sound sources.

TL;DR: The role of the corpus cardiacum hyperglycaemic hormone has been examined, and it has been shown that although a factor is present in Phormia cardiacum which increases both the level of blood trehalose in P. americana and the rate of treHalose synthesis in isolated Phormian fat body, this material does not produce a rise in blood tre Halose when injected into ad lib.

TL;DR: Turning was investigated in flying, tethered locusts by extracellular recording of muscle action potentials and by stroboscopic flash photographs of the wing movements and it was found that increased pronation of the left forewing during a left turn and of the right fore wing during a right turn was controlled by the first and second basalar muscles.

TL;DR: A study of the ultrastructure of the spermathecae and their ducts in Aedes aegypti revealed two principal cell types: (i) epithelial cells which surround the cuticular shell ofThe sperMatheca and thecuticular lining of theSpermat hecal duct, and (ii) glandular cells which are associated with the s permatheca.

TL;DR: The findings of growth experiments using synthetic diets from which individual vitamins were omitted showed that deprivation of thiamin, nicotinic acid, and calcium pantothenate greatly reduced first-generation larval growth and prevented the development of mature adults, suggesting the importance of stringent care in the pre-experimental storage of diets that may contain labile nutrients.

TL;DR: A hypothesis considering the new metabolic effects of the hormone suggests that its regulatory action is effective at a number of different sites.

TL;DR: It is argued that the optimal area effect, the blocking effect, and post-excitatory depression are all expressions of a single inhibitory process.

TL;DR: An hypothetical scheme of myofilament interaction is put forward for this supercontracting muscle, which is completely compatible with the sliding-filament theory of vertebrate muscle contraction.

TL;DR: It is concluded that the energy requirements are provided principally by utilization of protein and fat (during pupal and late pharate adult development) and that the contribution of carbohydrate is very small.

TL;DR: Results indicate that rate of rectal water absorption may be regulated by a factor or factors of neuroendocrine origin, and indicates that the cockroach possesses a regulatory system to control rate of RectalWater absorption.

TL;DR: It is concluded that the effect on supercooling exhibited by glycerol is not unique, but that a number of solutes in the haemolymph may have a similar effect.

TL;DR: Tissue from insects commencing adult development after diapause, through the action of either endogenous or injected ecdysone, showed increased biosynthetic rates, which suggests that the tissue had lost sensitivity to the hormone.

TL;DR: Optically controlled, extracellular microelectrode-recordings from the setae A 1, A 2, and A 3 prove the olfactory function of these organs.

TL;DR: The hypothesis is forwarded that the corpora allata are responsible, directly or indirectly, for certain known cases of delayed maturation (‘imaginal diapause’) in the desert locust.

TL;DR: The toxicity of senita cactus, and the alkaloids derived from it, pilocereine (I) and lophoceeine (II), have been tested against Drosophila pachea and eight other species of Drosophile of the Sonoran Desert.

TL;DR: A water-soluble o -diphenoloxidase occurs in the cuticles of the larvae of six species of flies belonging to three genera and the proenzyme is present in the haemolymph of larvae just as they are forming their puparia.

TL;DR: Juglone (5-hydroxy-1,4-naphthoquinone) from the bark of Carya ovata proved to be a deterrent to feeding by Scolytus multistriatus when juglone was removed from the extracts of the hickory bark.

TL;DR: A reversible colour change undergone by the over-wintering generation is likewise shown to be largely under the control of the adult photoperiod, although certain components of this change are influenced by non-photoperiodic factors to a small extent.

TL;DR: The effects of light and sugars were determined on the cotton aphid, Aphis gossypii Glover, maintained on germ-free and holidic diets, suggesting a ‘synergic’ nutritional effect from the mixture, especially on the growth of the progeny.

TL;DR: It was shown that the fatty acid pattern was different in the sexes, and the distinct divergence of the composition of the larva from that of the mulberry leaves suggested some aspects of fatty acid synthesis.

TL;DR: The lipids extracted from cast skins of Tenebrio molitor larvae were separated by chromatography on silicic acid and florisil columns and the free fatty acids were provisionally identified as myristic, palmitic, stearic, oleic, and linoleic acids.

TL;DR: The rate of RNA synthesis in many tissues roughly parallelled the rate of respiration during various stages of the life cycle, but there were significant differences in temporal patterns ofRNA synthesis not only between tissues but within a tissue.

TL;DR: The physiological significance of some of the structural features of the insect neuromuscular junction is discussed and it is suggested that these junctions might subserve a trophic function.

TL;DR: The virtual absence of tanning is shown by the fact that water-soluble protein in the cuticle remains soluble, and that the level of free tyrosine does not drop, as is typical in the formation of tanned puparia.

TL;DR: Electrophysiological techniques were used to locate the pacemaker in isolated and semi-isolated entire cords and the metathoracic ganglion was found to be the primary pacemaker, but shifting and multiple pacemakers occurred in some instances.