Showing papers in "Insect Biochemistry in 1978"

TL;DR: Glucose oxidation was stimulated by noradrenaline, dopamine, theophylline and dibutyryl cyclic AMP, but to a lesser extent than that found for similar concentrations of octopamine.

TL;DR: The effective barrier to cuticular water flux in these beetles appears largely attributable to the presence of surface hydrocarbons, and the least permeable species, C. verrucosa, was further characterized by having predominately long-chain, saturated n-alkanes.

TL;DR: In this paper, a steady state flight was established for the haemolymph of adult male Locusta migratoria during sustained tethered flight, in which the rate of diglyceride mobilization matched the rate for utilization.

TL;DR: It is concluded that during sustained tethered flight (when diglyceride is the predominant energy source) trehalose contributes substantially to flight muscle energy metabolism since 23% of the energy supply originates from carbohydrate oxidation.

TL;DR: The enzyme will oxidize a number of both ortho- and para-diphenols, and in contrast to untreated locust cuticle it is more active in releasing tritium located on the aromatic ring of N-acetyldopamine than in releasingtritium from the aliphatic side-chain of the same compound.

TL;DR: A survey of insect cuticular hydrocarbons shows that distantly related species have similar mixtures of branched hydrocarbon and indicates that the distribution pattern of hydrocarbon classes among insect orders in unlikely to be a discriminating chemotaxonomic character.

TL;DR: These findings provide the necessary framework for undertaking a more detailed analysis of the hormonal regulation of diapauselin synthesis and utilization of pre-diapausing larvae.

TL;DR: The intracellular distribution and maximal activities of some enzymes associated with lipogenesis, gluconeogenesis and fatty acid oxidation have been determined in the fat body of the adult male cockroach Periplaneta americana.

TL;DR: Sclerotized cuticles from locusts and from beetles were partially hydrolyzed by means of dilute acetic acid, and a number of low-molecular weight phenols was isolated from the hydrolysates, finding nine catechols with a short aliphatic sidechain.

TL;DR: There is no evidence for the existence of a protein precursor to the yolk proteins during their synthesis in the fat body although the possibility of a small pool of precursor which is rapidly turning over cannot be eliminated.

TL;DR: Vitellogenin and the diglyceride carrying lipoprotein are the predominant lipoproteins in the haemolymph of adult female locusts andAntibodies against these two proteins have been prepared which do not reveal any cross reactivity.

TL;DR: It is concluded that a high vitellogenin titre in the haemolymph inhibits its further release from the fat bodies, yet has no or very little effect on viteLLogenin production.

TL;DR: The results suggest that conversion of hexose to triose phosphate may occur predominantly via the pentose phosphate pathway and not via glycolysis.

TL;DR: It was suggested that the multiple forms of the house fly glutathione S -transferase observed in electrophoresis, or eluted from CM-cellulose columns, may be due to dissociation, aggregation, or binding with bromophenol blue which alters the molecular weight and the molecular charge of the enzyme.

TL;DR: Its rapid accumulation in the late third instar larvae and its sudden disappearance at pupariation suggest that the glucoside serves as a tyrosine reservoir for the sclerotization of the pupal case.

TL;DR: The larvae of Aedes aegypti contain at least 12 different species of proteinases with general proteinase activity, detectable on polyacrylamide gel electrophoresis, and some appear to be serinetype proteinases associated with the gut of the insect.

TL;DR: The present findings show that hosts parasitized by Microplitis croceipes, Cardiochiles nigriceps and Campoletis sonorensis show changes both in the amount of melanin formed when their haemolymph is exposed to air and in the total protein as determined by the Folin phenol reagent.

TL;DR: Ecdysone levels analysed during the 12 days of pupal-adult development of Heliothis zea showed a sharp rise in α-ecdysone production one day after larval-pupal ecdysis and a peak concentration 3.5 days after Ecdysis, while neither ecdysone was detectable during the latter phase of adult development.

TL;DR: Adult female Aedes aegypti contain at least eight different enzymic species with general proteinase activity, detectable on polyacrylamide gel electrophoresis, and seven of these are probably trypsin-like enzymes.

TL;DR: Lipolysis of mono- di- and triacylglycerol by locust fat body preparation was studied using microsomes and the soluble supernatant; mainly fatty acids were formed.

TL;DR: In the haemolymph of the silkworm, Bombyx mori, polymorphic variations were found in three lipoproteins named LPS, LPM and LPF according to their mobility on polyacrylamide gel electrophoresis and staining with Sudan black B.

TL;DR: There was no difference in the amount of cuticular surface lipid on male pupae when compared with female pupae in both diapausing and non-diapausing stages of development, and analysis of the hydrocarbons of four strains of pupae showed no difference.

TL;DR: The total soluble proteins and the fresh weights of the integument of the abdomina increase during the fifth larval instar about fivefold and slightly decrease before the next exuviation and decrease just before the ecdysis.

TL;DR: Endopeptidases from the midguts of larval and adult honey bee workers were purified and the chymotryptic proteases BIII and BIV were present in both developmental stages, whereas the tryptic protease A was only found in adult workers.

TL;DR: Analyses of the steam-distillable oils of male and female tarnished plant bugs, Lygus lineolaris, with an integrated gas chromatography-mass spectrometry system showed that most of the compounds were esters.

TL;DR: The properties of Na + -K + -activated ATPase in microsomal preparations from Malpighian tubules and hindgut of Locusta migratoria have been determined and the optimum temperature was 45°C whereas the activity of the Mg 2+ -dependent ATPase was still increasing at 50°C.

TL;DR: The hornet proteases resemble bovine trypsin by such criteria as substrate specificity, inactivation by certain inhibitors and molecular weights, and these enzymes were stable at pH 8 but unstabe below pH 5.

TL;DR: The alkaloids precoccinelline, hippodamine, and propyleine have been identified as components of the defensive secretion of Chauliognathus pulchellus and also contains (Z)-8-dihydromatricaria acid.

TL;DR: The glutathione content in various strains of adult housefly was found to be higher than that previously reported in houseflies, other insects, ticks and certain mammalian tissues.

TL;DR: The high threshold for Mg 2+ activation may be related to the high levels of Mg2+ in locust haemolymph, to the preferential phosphorylation of vitellin, and to the fact that the fat body is the site of vITEllogenin synthesis.