Publications
| Title | Abstract | Year(sorted ascending) Filter | PMID Filter |
|---|
| [location of thermoreceptors in dorcus parallelepipedus l. and pyrrhocoris apterus l]. | 1951 | 14860171 | |
| juvenile hormone activity for the bug pyrrhocoris apterus. | 1965 | 5217430 | |
| effect of hormones on growth and respiratory metabolism in the larvae of pyrrhocoris apterus l. (hemiptera). | 1965 | 14287217 | |
| on steroids 103. molting deficiencies produced by some sterol derivatives in an insect (pyrrhocoris apterus l.). | 1966 | 5967065 | |
| growth disorders of the bug pyrrhocoris apterus and the 'juvenile hormone' effect of certain papers. | 1966 | 5914235 | |
| 'paper factor' as an inhibitor of the embryonic development of the european bug, pyrrhocoris apterus. | 1966 | 5954582 | |
| [on the fine structure of the stink glands of the fire bug (pyrrhocoris apterus l., geocorisae). ii. report. the exit duct system and the non-glandular parts]. | 1966 | 5994736 | |
| [on the fine structure of the scent glands of firebugs (pyrrhocoris apterus l., geocorisae). i. on the functional morphology of the gland cell]. | 1966 | 5982714 | |
| juvenile hormone: identification of an active compound from balsam fir. | a sesquiterpenoid ester with high juvenile hormone activity for pyrrhocoris apterus (l.) was isolated from balsam fir, abies balsamea (l.) miller, and identified as the methyl ester of todomatuic acid. | 1966 | 5919750 |
| [paracrystalline endoplasmic reticulum in the ovary of pyrrhocoris apterus (heteroptera)]. | 1967 | 4385297 | |
| [on the fine structure of the scent glands of the fire bug (pyrrhocoris apterus l., geocorisae). the 2d larval abdominal gland]. | 1967 | 5599688 | |
| the inductors of differentiation of prefollicular tissue and the follicular epithelium in ovarioles of pyrrhocoris apterus (heteroptera). | 1968 | 5693888 | |
| [isolation and study of the mode of action of polygalacturonase of insects (pyrrhocoris apterus)]. | 1968 | 4967820 | |
| cytophotometry of dna and histone in meiosis of pyrrhocoris apterus. | 1970 | 5439577 | |
| prevention of metamorphosis by exposure of insect eggs to juvenile hormone analogs. | metamorphosis of the bugs pyrrhocoris apterus and oncopeltus fasciatus is blocked by the application of juvenile hormone analogs to the eqgs 4 weeks earlier. one or more supernumerary larval molts occur to form "giant" larvae which routinely die without undergoing netamorphosis. when the corpora allatta were excised at the outset of the fifth larval stage, the entire phenomenon vanished and all individuals underwent normal metamorphosis. the inhibition of metamorphosis can therefoore be attribut ... | 1970 | 17734449 |
| insect hormones and insect control, or, sex and the single pyrrhocoris apterus. | 1971 | 5136553 | |
| induction of adult diapause in pyrrhocoris apterus l. by short cold exposure. | the ripening of ovaries in the females of pyrrhocoris apterus can be inhibited not only by short-day photoperiod but also by cold shocks during the first week of the adult life.ovaries in a part of the females are prevented from ripening by transferring the bugs from 25° c and long-day photoperiod to substantially lower temperatures for 2 (or 4) days. the oviposition is inhibited at least for 3 weeks after the return to original conditions favourable for reproduction. this effect is achieved whe ... | 1971 | 28310755 |
| nervous inhibition of corpora allata by photoperoid in pyrrhocoris apterus. | 1976 | 972704 | |
| behavioral regulation of developmental cycle in pyrrhocoris apterus l. (heteroptera: pyrrhocoridae). | during the warm season the larvae of pyrrhocoris apterus select in their natural habitats places with temperatures which do not exceed 24°c on average even at the hours of maximum sunshine. at the same time other places of their habitats have temperatures up to 50°c. this active behavioral selection of the microclimate regulates the speed of p. apterus development and entertains the monovoltine cycle in climatic, conditions of central europe. a less rigorous choice of the microclimate, even when ... | 1976 | 28308254 |
| morphological effects of juvenile hormone mimics on embryonic development in the bug,pyrrhocoris apterus. | embryos ofpyrrhocoris apterus exposed to juvenile hormone mimics (jh) were examined throughout development to determine the progressive effects of treatment. prior to blastokinesis whole experimental embryos did not differ morphologically from control embryos fixed at the same stage. treated embryos failed to complete blastokinesis due to abnormal breakage of the extra-embryonic membranes.in the embryo-larva transition, jh exposure interfered with dorsal closure, with the consolidation of the ne ... | 1977 | 28304913 |
| function of the neuroendocrine complex in diapausing pyrrhocoris apterus females. | 1977 | 558247 | |
| studies of the spermatogenesis in the firebug, pyrrhocoris apterus l. (heteroptera). i. a unique basal body-associated plaque carrying a microtubule organizing center (mtoc) in spermatids. | 1979 | 480411 | |
| blastokinesis in embryos of the bug, pyrrhocoris apterus. a light and electron microscopic study 1. normal blastokinesis. | in the bug, pyrrhocoris apterus, blastokinesis (a reversal of the position of the embryo within the egg) is seen to involve contraction of the serosa that is attached to the embryo's head. as the serosal cells change from squamous to columnar in the course of blastokinesis, a dense zone of microfilaments appears just under the apical surface. many apical protrusions develop above this zone. after the embryo is in its final position the zone disappears and later the cells degenerate. laterally, t ... | 1981 | 7264550 |
| juvenoids cause some insects to form composite cuticles. | metamorphosing insects treated with juvenoids may secrete composite cuticles which combine morphological features of two metamorphic stages within the area secreted by an individual epidermal cell. characters found combined were pigmentation, tanning, surface sculpturing, and microtrichiae. neighbouring cells frequently form different types of cuticle. composite cuticles should not be confused with the more common mosaic cuticles, which are composed of discrete areas with different stage-specifi ... | 1982 | 7153697 |
| inhibition of phosphatase by open-chain nucleoside analogues in insects. | (s)-9-(2,3-dihydroxypropyl) adenine (dhpa), d-eritadenine and some other open-chain nucleoside analogues, which exhibit adverse biological effects in microorganisms, plants and animals, cause pronounced inhibition of intestinal phosphatases in the hemipteran insect pyrrhocoris apterus. the rate of p-nitrophenylphosphate hydrolysis by homogenates from intestinal epithelium and malpighian tubules was inhibited up to 94% by 2-10 millimolar concentrations of these drugs. this effect is stronger than ... | 1989 | 2537747 |
| chemistry of defensive secretions in nymphs and adults of fire bug,pyrrhocoris apterus l. (heteroptera, pyrrhocoridae). | the defensive secretions from the nymphs and the adults of both sexes inp. apterus were chemically investigated. forty components were identified from the nymphal posterior dorsoabdominal glands and 35 from the adult metathoracic glands of both sexes. within the 43 identified chemicals, we found 23 aldehydes, five saturated hydrocarbons, five alcohols, three ketones, three lactones, two terpenes, one phenol and one ester. thirteen of these compounds had never been reported within the heteroptera ... | 1992 | 24254711 |
| novel inducible antibacterial peptides from a hemipteran insect, the sap-sucking bug pyrrhocoris apterus. | insects belonging to the recent orders of the endopterygote clade (lepidoptera, diptera, hymenoptera and coleoptera) respond to bacterial challenge by the rapid and transient synthesis of a battery of potent antibacterial peptides which are secreted into their haemolymph. here we present the first report on inducible antibacterial molecules in the sap-sucking bug pyrrhocoris apterus, a representative species of the hemiptera, which predated the endoptergotes by at least 50 million years in evolu ... | 1994 | 8002963 |
| temperature regulation of supercooling and gut nucleation in relation to diapause of pyrrhocoris apterus (l.) (heteroptera) | the heteropteran pyrrhocoris apterus (l.) does not survive freezing of its body fluids; there is a good correlation between values of survival at subzero temperatures and the supercooling point (scp), i.e., the temperature at which body fluids start to freeze. the decrease of the scp and thus the increase in cold hardiness is regulated by photoperiod and temperature. the relative importance of these factors depends on the physiological state of the insect. the scp is about -7°c at the onset ... | 1997 | 9028917 |
| wing morph-related physiological differences in adults of temperate population of pyrrhocoris apterus (l.) (heteroptera: pyrrhocoridae). | the reproductive and diapausing adult females of brachypterous morph and macropterous females with reproductive arrest of non-diapause type, originating from the laboratory cultures of pyrrhocoris apterus, were studied for their feeding and drinking behaviour, digestive enzyme activities, and carbohydrate and lipid contents. the highest feeding and drinking activities were observed in reproductive brachypters, the lowest in macropters. macropters also differed from brachypters by lower activitie ... | 1998 | 10048189 |
| growth inhibitory effect of juvenile hormone analogues on epimastigotes of trypanosoma cruzi. | several compounds, structurally related to the insect growth regulator fenoxycarb, exhibited interesting inhibition action to control proliferation of trypanosoma cruzi, the parasite responsible for chagas' disease. some of these drugs were shown to be potent growth inhibitors of this parasite. all of these drugs had previously presented juvenoid activity on several non-related bug species such as tenebrio molitor, galleria mellonella, dysdercus cingulatos, and pyrrhocoris apterus. | 1998 | 9873713 |
| ttagg telomeric repeats in chromosomes of some insects and other arthropods. | we studied the occurrence of the ttagg telomere repeats by fluorescence in-situ hybridization (fish) and southern hybridization in ten insect species and two other arthropods. (ttagg)n-containing telomeres were found in three lepidoptera species, the silkworm bombyx mori (in which the telomeric sequence was recently discovered), the flour moth ephestia kuehniella, and the wax moth galleria mellonella, in one species of hymenoptera, the honey bee apis mellifera, in one species of coleoptera, the ... | 1999 | 10560968 |
| overwintering strategy in pyrrhocoris apterus (heteroptera): the relations between life-cycle, chill tolerance and physiological adjustments. | seasonal dynamics of ecophysiological parameters are described which are relevant to overwintering in field-collected adults of a czech population of the red firebug, pyrrhocoris apterus. five life-cycle phases were distinguished using the duration of pre-oviposition period as a criterion: reproductive activity (spring-early summer), intensification of reproductive diapause (rd) (peak of summer), maintenance of rd (late summer-early autumn), termination of rd (late autumn-early winter), and low ... | 2000 | 10844151 |
| a new member of the akh/rpch family that stimulates locomotory activity in the firebug, pyrrhocoris apterus (heteroptera). | a new member of the akh/rpch family was isolated and identified from the corpora cardiaca of the firebug pyrrhocoris apterus. the peptide was isolated in a single step by reversed phase hplc and the structure deduced from the multiple ms (ms(n)) electrospray mass spectra and amino acid analysis as that of an octapeptide with the sequence pglu-leu-asn-phe-thr-pro-asn-trp-nh(2): this sequence was confirmed by synthesis. the synthetic peptide induced lipid mobilisation and stimulated locomotory act ... | 2000 | 10802240 |
| regulation of corpora allata in females of pyrrhocoris apterus (heteroptera) (a mini-review). | mechanisms for the transduction of photoperiodic and food signals to the corpus allatum (ca) are described. the focus of this paper is on the control of the ca by the brain in adult females of the firebug, pyrrhocoris apterus. by using surgical interventions to the neuroendocrine complex of brain-subesophageal ganglion-corpora cardiaca-ca (br-sg-cc-ca) in vivo and in vitro we were able to identify two regulatory pathways. (1) slow regulation of the ca activity (stimulation or inhibition) needs a ... | 2001 | 11710430 |
| cryoprotective role of polyols independent of the increase in supercooling capacity in diapausing adults of pyrrhocoris apterus (heteroptera: insecta). | diapausing cold-acclimated adults of the bug pyrrhocoris apterus accumulate four 'winter' polyols, ribitol, sorbitol, mannitol and arabinitol, in total concentrations of up to 100 mm. the accumulation started only when the temperatures dropped below a threshold of +5 degrees c in laboratory acclimated insects. the supercooling capacity (scp) was not affected by polyol accumulation and remained constant at approximately -17 degrees c. cold hardiness, measured as survival time (lt50) at -15 degree ... | 2001 | 11567899 |
| effect of thermoperiod on diapause intensity in pyrrhocoris apterus (heteroptera pyrrhocoridae). | the intensity of adult diapause in pyrrhocoris apterus was measured in two series of experiments as the duration of pre-oviposition period at a constant temperature of 25 degrees c after transfer from short (12l:12d) to long day conditions (18l:6d). higher diapause intensity was induced with a thermoperiod than at constant temperatures. after the induction throughout larval instars 3-5 and during 4 weeks of adult life at short days and a thermoperiod of 25/15 degrees c the pre-oviposition period ... | 2001 | 11033167 |
| differential infectivity of two pseudomonas species and the immune response in the milkweed bug, oncopeltus fasciatus (insecta: hemiptera). | pseudomonas aeruginosa and pseudomonas putida show a profound differential infectivity after inoculation in oncopeltus fasciatus. whereas p. putida has no significant impact on nymphs, p. aeruginosa kills all experimental animals within 48 h. both pseudomonas species, however, induce the same four hemolymph peptides in o. fasciatus. also injection of saline solution and injury induced these peptides. in general peptide induction was stronger in nymphs than in adult males. a significantly higher ... | 2001 | 11812116 |
| identification of the cockroach neuropeptide pea-cah-ii as a second adipokinetic hormone in the firebug pyrrhocoris apterus. | a new member of the akh/rpch family was isolated from the corpora cardiaca of the firebug pyrrhocoris apterus. it is the second adipokinetic peptide identified in this species. the peptide was characterized and its structure was deduced from the multiple ms(n) electrospray mass spectra as that of an octapeptide with the sequence pglu-leu-thr-phe-thr-pro-asn-trp-nh(2.) the peptide differs from the original p. apterus akh (pya-akh) by one amino acid in position 3. topical application and/or inject ... | 2002 | 11836011 |
| a quantitative study of adipokinetic hormone of the firebug, pyrrhocoris apterus. | the development of an enzyme-linked immunoassay (elisa) for the adipokinetic neuropeptide hormone, pya-akh, from the firebug pyrrhocoris apterus l. is described. the elisa measures as little as 20 fmol of pya-akh. tested against a range of synthetic peptides, the assay has a high sensitivity for peptides containing the c-terminal motif ftpnwamide. the amounts of pya-akh in the brain, corpora cardiaca, suboesophageal ganglia, and fused thoracic and abdominal ganglionic mass are very small, with o ... | 2002 | 12770033 |
| photoperiodic regulation of the phospholipid molecular species composition in thoracic muscles and fat body of pyrrhocoris apterus (heteroptera) via an endocrine gland, corpus allatum. | in the conventional view, the winter adaptation of membrane lipids is induced by temperature decrease. we propose that winter remodelling of membranes in pyrrhocoris apterus is triggered by short-day photoperiod before the temperature decrease and changes caused by cold temperature represent the later phase of adaptation. the induction of diapause by short-day photoperiod results in an accumulation of phosphatidylethanolamine (pe) molecular species with c(16:0)/c(18:2) acyl chains esterified to ... | 2002 | 12770024 |
| developmental and diel changes of adipokinetic hormone in cns and haemolymph of the flightless wing-polymorphic bug, pyrrhocoris apterus (l.). | we have used an enzyme-linked immunoassay (elisa) for determination of the akh content in cns (brain + corpora cardiaca + corpora allata) and haemolymph of adult macropterous and brachypterous females of the bug pyrrhocoris apterus. the tests revealed that the akh content fluctuates between 1 and almost 4 pmol/cns during the first 14 days of adult life and significantly increased in order diapausing brachypters<reproductive brachypters<macropters. the titre of akh in haemolymph is detectable mos ... | 2003 | 12770016 |
| photoperiodic regulation of diapause in linden bugs: are period and clock genes involved? | although photoperiodism is undoubtedly one of the most important functions of the circadian system, the role of circadian clock genes remains unclear. we compared the expression of period and clock genes in the head of the linden bug, pyrrhocoris apterus, kept under diapause promoting short days (sd) and diapause-preventing long days (ld), using an rnase protection assay. there was only a weak diurnal rhythm in both period and clock mrna under ld and no rhythm under sd. under sd, however, the le ... | 2003 | 14625693 |
| conservation of ecdysis-triggering hormone signalling in insects. | pre-ecdysis- and ecdysis-triggering hormones (peth and eth) from endocrine inka cells initiate ecdysis in moths and drosophila through direct actions on the central nervous system (cns). using immunohistochemistry, we found inka cells in representatives of all major insect orders. in most insects, inka cells are numerous, small and scattered throughout the tracheal system. only some higher holometabolous insects exhibit 8-9 pairs of large inka cells attached to tracheae in each prothoracic and a ... | 2003 | 12624163 |
| corazonin and corazonin-like substances in the central nervous system of the pterygote and apterygote insects. | antisera against corazonin were used to investigate distribution of immunoreactive cells in the central nervous system (cns) of representatives of six insect orders: ctenolepisma lineata (zygentoma), locusta migratoria (orthoptera), oxya yezoensis (orthoptera), gryllus bimaculatus (orthoptera), pyrrhocoris apterus (hemiptera), arge nigrinodosa (hymenoptera), athalia rosae (hymenoptera), bombyx mori (lepidoptera) and anomala cuprea (coleoptera). corazonin-like immunoreactive (cli) cells were dete ... | 2003 | 12733057 |
| on the nature of pre-freeze mortality in insects: water balance, ion homeostasis and energy charge in the adults of pyrrhocoris apterus. | three acclimation groups [i.e. non-diapause (ld), diapause (sd) and diapause, cold-acclimated (sda)] of the adult bugs pyrrhocoris apterus differed markedly in their levels of chill tolerance. survival time at a sub-zero, but non-freezing, temperature of -5 degrees c (lt50) extended from 7.6 days, through 35.6 days, to >60 days in the ld, sd and sda insects, respectively. the time necessary for recovery after chill-coma increased linearly with the increasing time of exposure to -5 degrees c, and ... | 2004 | 15037645 |
| structure and properties of the glandular surface in the digestive zone of the pitcher in the carnivorous plant nepenthes ventrata and its role in insect trapping and retention. | carnivorous plants of the genus nepenthes grow in nutrient-poor habitats and have evolved specialised trapping organs, known as pitchers. these are composed of different surface zones serving the functions of attraction, capture and digestion of insects, which represent a main source of nitrogen. to investigate the role of the glandular digestive zone in the trapping mechanism of the pitcher, structural, mechanical and physico-chemical studies were applied to n. ventrata and combined with insect ... | 2004 | 15277550 |
| wing morph-related differences in developmental pattern of accessory gland proteins in adult males of pyrrhocoris apterus (l.) and their endocrine control. | the study showed that the amounts of the total proteins and 53 kda protein in male accessory glands (ags) of the firebug pyrrhocoris apterus (l.) increased with age of the adult life. the 53 kda protein, the most abundant polypeptide detected in the secretion of the ags, and some other smaller peptides were identified as glycoproteins. changes in the amounts of the total proteins and 53 kda protein in ags were found to be wing morph-dependent and their levels were significantly higher in 1-10 da ... | 2004 | 15518657 |
| cyclization of pyrrhocoricin retains structural elements crucial for the antimicrobial activity of the native peptide. | pyrrhocoricin is a naturally occurring antimicrobial peptide from the european fire bug pyrrhocoris apterus. it has submicromolar activity against a range of gram-negative bacterial strains and has created recent interest as a lead for the development of novel antibiotic compounds. in this study, we have used nmr spectroscopy to determine the solution structures of pyrrhocoricin and a synthetic macrocyclic derivative that has improved in vivo pharmaceutical properties. native pyrrhocoricin is la ... | 2004 | 15478127 |
| adjustments of the enzymatic complement for polyol biosynthesis and accumulation in diapausing cold-acclimated adults of pyrrhocoris apterus. | the capacity to accumulate winter polyols (mainly ribitol and sorbitol) during cold-acclimation in pyrrhocoris apterus is restricted only to the adults that have previously entered diapause. the enzymatic complement involved in polyol biosynthesis was found to differ in a complex manner between diapause and non-diapause adults. nearly 100% of glycogen phosphorylase (gpase) was present in its active form in non-diapause adults irrespective of their acclimation status. in contrast, less than 40% o ... | 2004 | 15081823 |
| wing morph-specific differences in the metabolism and endocrine control of reserve mobilization in adult males of a flightless bug, pyrrhocoris apterus (l.) (heteroptera). | the differences in the metabolism and endocrine control of reserve mobilization in long-winged (macropterous) and short-winged (brachypterous) males of a flightless firebug (pyrrhocoris apterus) were studied. we found that protein content in the gut was significantly lower in 5-10 day-old macropterous males due to their fasting and higher in 28 day-old ones than in the same aged brachypterous counterparts as the result of renewed food intake. overall protease activity was significantly lower in ... | 2005 | 16088393 |
| is period gene causally involved in the photoperiodic regulation of reproductive diapause in the linden bug, pyrrhocoris apterus? | earlier experiments demonstrated a strong up-regulation of per mrna in wild-type (wt) females of pyrrhocoris apterus reared under diapause-inducing short days, while per mrna levels were low in females of two non-diapause mutant strains (nd), irrespective of photoperiod. in the present study, different sequences of per dna in two strains of geographically different origin enabled us to analyse genetic linkage between the per gene and the nd phenotype. crosses between wt females originating from ... | 2005 | 15993130 |
| the effect of insecticide on adipokinetic hormone titre in the insect body. | the effect of an insecticide, permethrin (ambush 25 ec), on the titre of two adipokinetic hormones in the central nervous system (cns) and haemolymph of the firebug pyrrhocoris apterus (l) was tested. doses of 2.5, 12.5 and 25 ng of the insecticide elicited no significant effect on the titre of the adipokinetic peptides in cns, but caused their dramatic elevation in the haemolymph of both macropterous and reproductive brachypterous bugs. changes in diapausing brachypterous bugs were minimal and ... | 2005 | 15966049 |
| ectoparasitic mite hemipteroseius adleri (acari: otopheidomenidae) on the red firebug pyrrhocoris apterus (heteroptera: pyrrhocoridae). | 2005 | 15792104 | |
| seasonal acquisition of chill tolerance and restructuring of membrane glycerophospholipids in an overwintering insect: triggering by low temperature, desiccation and diapause progression. | adults of the insect pyrrhocoris apterus acquire chill tolerance through the process of autumnal acclimatization. field and laboratory experiments were conducted to separate the triggering effects of low temperatures, desiccation and diapause progression on the physiological characteristics related to chill tolerance with emphasis on the restructuring of glycerophospholipid (gpl) composition. changes in relative proportions of major molecular species of glycerophosphoethanolamines (gpetns) and g ... | 2006 | 17023604 |
| flight muscles polymorphism in a flightless bug, pyrrhocoris apterus (l.): developmental pattern, biochemical profile and endocrine control. | the flightless bug pyrrhocoris apterus (l.) is polymorphic for both wing length and flight muscle development. the developed flight muscles of macropterous adults of both sexes first enlarge their volume during the first 5 days after adult emergence, but are then histolyzed in all males and females older than 10 and 14 days, respectively. the flight muscles of brachypterous adult males and females are underdeveloped due to their arrested growth. the total protein content of histolyzed dorsolongi ... | 2006 | 16388820 |
| insect pest management agents: hormonogen esters (juvenogens). | the chemical part of this investigation focused on designing structures and synthesizing a series of six new esters (juvenogens), derived from biologically active insect juvenile hormone bioanalogues (juvenoids, jhas) and unsaturated short-chain linear and branched fatty acids for possible application as biochemically targeted insect hormonogen agents. the structures of the new compounds were assigned on the basis of a detailed nmr analysis of their (1)h and (13)c nmr spectra. the biological par ... | 2007 | 17691805 |
| glycosidic juvenogens: derivatives bearing alpha,beta-unsaturated ester functionalities. | a series of the protected alkyl glycosides 5a/5b-12a/12b was synthesized from the parent isomeric alcohols (insect juvenile hormone bioanalogs; juvenoids), 4-[4'-(2''-hydroxycyclohexyl)methylphenoxy]-3-methyl-but-2-enoic acid ethyl ester (1a/1b-4a/4b; racemic structures) and (1a-4a; enantiopure structures). cadmium carbonate was used as a promoter of this koenigs-knorr reaction, and the products were obtained in 82-92% yields. deprotection of the carbohydrate functionality of 5a/5b-12a/12b was c ... | 2007 | 17825568 |
| photoperiodic and food signals control expression pattern of the clock gene, period, in the linden bug, pyrrhocoris apterus. | the temporal expression pattern of the circadian clock gene period was compared between heads of the linden bug, pyrrhocoris apterus , kept under diapause-promoting short days (sd) and diapause-preventing long days (ld) using a real-time pcr quantification. diapause or reproduction was programmed by photoperiod during the larval stage, but the first difference in per mrna abundance between sd and ld insects was observed only after adult ecdysis. the expression level of per mrna was markedly high ... | 2007 | 17660450 |
| 20-hydroxyecdysone prevents oxidative stress damage in adult pyrrhocoris apterus. | injections of 38 pmol paraquat (1,1'-dimethyl-4,4'-bypyridilium) into adult pyrrhocoris apterus (average body weight 29.6 mg in males and 36.9 mg in females) caused a significant elevation of lipid peroxidation and protein carbonylation and a decline of membrane fluidity in the microsomal brain fraction. another manifestation of oxidative stress was a depletion of the reduced glutathione pool and reduction of the gamma-glutamyl transpeptidase activity in the brain extracts. the damaging action o ... | 2007 | 17570141 |
| adipokinetic hormone-induced enhancement of antioxidant capacity of pyrrhocoris apterus hemolymph in response to oxidative stress. | the in vivo effects of oxidative stress on adipokinetic hormone (akh) titer in short-winged (brachypterous) males of the firebug pyrrhocoris apterus were tested using paraquat (pq), a bipyridilium herbicide. pq undergoes a cyclic redox reaction with oxygen during microsomal and electron transfer reactions forming free radicals in the insect body. oxidative insult (40 pmol pq) resulted in enhanced protein carbonylation (a biomarker for oxidative stress) and a depletion of glutathione (gsh) pool i ... | 2007 | 17512258 |
| the systemic effects of juvenoids on the red firebug pyrrhocoris apterus and on the pea aphid acyrthosiphon pisum with data on life table response. | a series of juvenoid alcohols and their glycosidic derivatives (juvenogens), synthesized at the institute of organic chemistry and biochemistry in prague, commercially used juvenoids and the natural derivatives of juvabione were evaluated for their systemic juvenilizing effect on the red firebug, pyrrhocoris apterus l., and on the pea aphid, acyrthosiphon pisum harris. a life table response experiment was designed, and demographic characteristics were computed for a cohort of a. pisum following ... | 2007 | 17724791 |
| insect cold tolerance and repair of chill-injury at fluctuating thermal regimes: role of ion homeostasis. | adults of the bug pyrrhocoris apterus and the beetle alphitobius diaperinus developed chill-injury slower and survived longer when they were exposed to fluctuating thermal regimes (ftrs, where periods of low temperature were alternated with periods of higher temperature on a daily basis) rather than to constant low temperatures. the extracellular (haemolymph) concentrations of potassium ions increased with significantly higher rates in the insects exposed to constant low temperatures than in tho ... | 2007 | 17275375 |
| tissue signaling pathways in the regulation of life-span and reproduction in females of the linden bug, pyrrhocoris apterus. | molecular studies on drosophila melanogaster do not provide consistent results with regard to the hormonal regulation of a trade-off between life-span and fecundity. to unravel the physiological basis of the cost of reproduction without affecting animal's genotype, a new insect model, pyrrhocoris apterus, was employed. reproduction was manipulated by surgical ablations of tissues implicated in reproductive endocrinology, namely the pars intercerebralis (pi) of the brain, the corpus allatum (ca) ... | 2008 | 18206160 |
| dynamism in physiology and gene transcription during reproductive diapause in a heteropteran bug, pyrrhocoris apterus. | reproductive diapause was characterized in females of pyrrhocoris apterus using physiological parameters (diapause intensity, photoperiodic responsiveness, oxygen consumption, mass and hydration) and changes in relative abundance of mrna transcripts of eight different genes coding for proteins implemented in energy metabolism, cryoprotectant biosynthesis, biological clocks, and hormonal receptors. changes in diapause intensity served as a basis for distinguishing successive phases of diapause de ... | 2008 | 17880995 |
| endocrine-dependent expression of circadian clock genes in insects. | current models state that insect peripheral oscillators are directly responsive to light, while mammalian peripheral clock genes are coordinated by a master clock in the brain via intermediate factors, possibly hormonal. we show that the expression levels of two circadian clock genes, period (per) and par domain protein 1 (pdp1) in the peripheral tissue of an insect model species, the linden bug pyrrhocoris apterus, are inversely affected by contrasting photoperiods. the effect of photoperiod on ... | 2008 | 18239853 |
| stimulatory effects of bioamines norepinephrine and dopamine on locomotion of pyrrhocoris apterus (l.): is the adipokinetic hormone involved? | in the present paper we studied the effects of five biogenic amines - norepinephrine, dopamine, octopamine, serotonin and histamine - on the locomotory activity and mobilization of lipids in the adult females of the firebug, pyrrhocoris apterus (l.). we tested the hypothesis (1) whether the stimulation of walking activity in the bugs injected with the bioamines is associated also with their hyperlipaemic effects, like in the case of adipokinetic hormones (akhs), and (2) whether these effects are ... | 2008 | 18707014 |
| differential allocation of protein resources to flight muscles and reproductive organs in the flightless wing-polymorphic bug, pyrrhocoris apterus (l.) (heteroptera). | differences in the growth of dorsolongitudinal flight muscles and gonads in 1-28 days old long-winged (macropterous) and short-winged (brachypterous) adults of the firebug (pyrrhocoris apterus l.) and the resource allocation to these organs were studied by means of total protein analysis. we found predominant allocation of food resources to flight muscles compared to reproductive organs in both macropterous males and females during the first 5 days of adult life. subsequent histolysis of develop ... | 2008 | 17901960 |
| [the first proof of a possibility of change of temperature norms of insect development as a result of artificial selection for rapid or slow development by the example of the red soldier bug pyrrhocoris apterus (heteroptera: pyrrhocoridae)]. | for 3-4 generations, selection of the most rapidly and slowly developing nymphs at 28 degrees c was performed on four families of the red soldier bug pyrrhocoris apterus l. in each generation, duration of development of nymphs was determined at 5 constant temperatures from 20 degrees c to 28 degrees c. from these data there were calculated the linear regression coefficient of the development rate for temperature (the coefficient of the thermolability of development) and the temperature developme ... | 2009 | 18669278 |
| juvenile hormone-stimulated synthesis of acyl-glycerols and vitamin e in female accessory sexual glands of the fire bug, pyrrhocoris apterus l. | secretory cells of the female accessory sexual glands (ag) of p. apterus grow and produce yellow oily exocrine secretion in response to stimulation by endogenous juvenile hormone (jh) or exogenous treatments by jh analogues. the secretion determines the property of future egg shells by coating the chorion surface of the oocytes that are passing individually through the common uterus during oviposition. diapausing females with a physiologically inhibited endocrine system or females with artificia ... | 2009 | 19557854 |
| multiple mechanisms generate the resting activity of filiform sensilla in the firebug (pyrrhocoris apterus l.; heteroptera). | the resting activity was studied in filiform sensilla of the firebug (pyrrhocoris apterus). three functional types (t(1), t(2) and t(3)) were detected on the abdomen. a resting discharge of nerve impulses is present in all-always in types t(1) and t(2) and occasionally in type t(3). in t(1) the mean rate is 57, in t(2) 3.3 and in t(3) 0.5 imp/s. shortening the hair length had a negligible effect on the resting discharge, which indicates an intrinsic origin. the resting activity is highly tempera ... | 2009 | 19381645 |
| [study of intrapopulation variability of duration and thermal norms of development of the linden bug pyrrhocoris apterus (heteroptera, pyrrhocoridae)]. | the existence of significant variability in duration and temperature norms of development has been shown for the first time between families within insect populations. this variability is infer-family and therefore has genetic basis. revealed for the first time is the statistically significant positive correlations between the regression coefficient of the rate of development for temperature and the threshold of temperature for development of eggs and larvae from different families. the greater ... | 2009 | 19198159 |
| neuropeptides in heteroptera: identification of allatotropin-related peptide and tachykinin-related peptides using maldi-tof mass spectrometry. | recently, the peptidomic analysis of neuropeptides from the retrocerebral complex and abdominal perisympathetic organs of polyphagous stinkbugs (pentatomidae) revealed the group-specific sequences of pyrokinins, capa peptides (capa-periviscerokinins/pvks and capa-pyrokinin), myosuppressin, corazonin, adipokinetic hormone, and short neuropeptide f. in this study, we used mass spectrometric profiling of nervous tissue from the species-rich taxon hemiptera to identify products of two previously uno ... | 2009 | 19084564 |
| activation of insect anti-oxidative mechanisms by mammalian glucagon. | resembling the main function of insect adipokinetic hormones (akhs), the vertebrate hormone glucagon mobilizes energy reserves and participates in the control of glucose level in the blood. considering the similarities, the effect of porcine glucagon was evaluated in an insect model species, the firebug pyrrhocoris apterus. using the mouse anti-glucagon antibody, presence of immunoreactive material was demonstrated for the first time in the firebug cns and gut by elisa. mammalian (porcine) gluca ... | 2009 | 19095076 |
| localization and transmission route of coriobacterium glomerans, the endosymbiont of pyrrhocorid bugs. | endosymbiotic gut bacteria play an essential role in the nutrition of many insects. most of the nutritional interactions investigated so far involve gammaproteobacterial symbionts, whereas other groups have received comparatively little attention. here, we report on the localization and the transmission route of the specific actinobacterial symbiont coriobacterium glomerans from the gut of the red firebug, pyrrhocoris apterus (hemiptera: pyrrhocoridae). the symbionts were detected by diagnostic ... | 2009 | 19583787 |
| the 70 kda heat shock protein assists during the repair of chilling injury in the insect, pyrrhocoris apterus. | the pyrrhocoris apterus (insecta: heteroptera) adults attain high levels of cold tolerance during their overwintering diapause. non-diapause reproducing adults, however, lack the capacity to express a whole array of cold-tolerance adaptations and show relatively low survival when exposed to sub-zero temperatures. we assessed the competence of non-diapause males of p. apterus for responding to heat- and cold-stresses by up-regulation of 70 kda heat shock proteins (hsps) and the role of hsps durin ... | 2009 | 19229329 |
| steroid conjugates: synthesis and preliminary biological testing of pro-juvenoids. | a series of 10 new pro-juvenoids (juvenogens, insect hormonogenic compounds, pro-drug-like agents) was synthesized using isomeric synthetic juvenoids (insect juvenile hormone analogs) and steroid molecules as patterns modifying parts of the complex hormonogenic molecules. in addition, several new synthons were prepared, which were required by the designed synthetic protocol to achieve the target molecules. these pro-juvenoids were subjected to the topical screening tests and to the drinking assa ... | 2010 | 21036621 |
| personality matters: individual variation in reactions of naive bird predators to aposematic prey. | variation in reactions to aposematic prey is common among conspecific individuals of bird predators. it may result from different individual experience but it also exists among naive birds. this variation may possibly be explained by the effect of personality--a complex of correlated, heritable behavioural traits consistent across contexts. in the great tit (parus major), two extreme personality types have been defined. 'fast' explorers are bold, aggressive and routine-forming; 'slow' explorers ... | 2010 | 19889698 |
| adipokinetic hormone (pyrap-akh) enhances the effect of a pyrethroid insecticide against the firebug pyrrhocoris apterus. | adipokinetic hormones (akhs) are insect neuropetides controlling stress situations including those elicited by insecticide treatment. the effect of pyrap-akh on the mortality of the firebug pyrrhocoris apterus (l.) treated with the insecticide permethrin (ambush 25 ec) was studied. | 2010 | 20013955 |
| seasonal changes of free amino acids and thermal hysteresis in overwintering heteropteran insect, pyrrhocoris apterus. | overwintering adults of pyrrhocoris apterus do not tolerate freezing of their body fluids and rely on a supercooling strategy and seasonal accumulation of polyols to survive at subzero body temperatures. we sampled the adults monthly in the field during the cold season 2008-2009 and found active thermal hysteresis factors (thfs) in hemolymph of winter-sampled adults. the hysteresis between the equilibrium melting and freezing points ranged from 0.18°c to 0.30°c. no signs of thfs activity were fo ... | 2011 | 21729762 |
| novel roles for the corpus allatum hormone in the cost of sexual interactions in the linden bug pyrrhocoris apterus. | the cost of sexual interactions, usually expressed as a reduction of life-span, is a fundamental but poorly understood aspect of life. according to a widely accepted view, a rise in the "pro-aging" juvenile hormone (jh) might contribute to the decrease of life span caused by sexual interactions. we tested this hypothesis using the linden bug pyrrhocoris apterus by removing the corpus allatum (ca), the source of jh. if jh is causally involved in the cost of sexual interactions, then the absence o ... | 2011 | 21315724 |
| oxidative stress elicited by insecticides: a role for the adipokinetic hormone. | adipokinetic hormones (akhs) are insect neuropeptides responding to stress situations including oxidative stress. two insecticides - endosulfan and malathion - were used to elicit oxidative stress conditions in the firebug pyrrhocoris apterus, and the physiological functions of akhs and their ability to activate protective antioxidative reactions were studied. the insecticide treatments elicited only a slight increase of the akh level in cns, but more intensive increase in haemolymph, which indi ... | 2011 | 21185291 |
| individual behaviour in firebugs (pyrrhocoris apterus). | the concept of animal personalities has recently become of major interest as researchers began to wonder why animals within a given population show consistent behaviour across situations and contexts, what led to the evolution of such behavioural inflexibility and what mechanisms might underlie the phenomenon. a recent model explains individual differences in a population as the result of trade-off between present and future reproduction. we tested this model on the two wing morphs, i.e. short-w ... | 2011 | 20826482 |
| study of the pest community of velvetleaf (abutilon theophrasti medic.). | velvetleaf (abutilon theophrasti medicus 1787) is one of the most economically threatening weed plant in hungary. researching biological control against it, and identifying a possible and effective biocontrol agent is an important challenge, as chemical control is difficult and expensive, and there is an increasing claim to practice slight plant protection. entomological studies were made in several parts of the world, for evaluating the species, occuring in velvetleaf, but none of these kind of ... | 2011 | 22696962 |
| common and distinct roles of juvenile hormone signaling genes in metamorphosis of holometabolous and hemimetabolous insects. | insect larvae metamorphose to winged and reproductive adults either directly (hemimetaboly) or through an intermediary pupal stage (holometaboly). in either case juvenile hormone (jh) prevents metamorphosis until a larva has attained an appropriate phase of development. in holometabolous insects, jh acts through its putative receptor methoprene-tolerant (met) to regulate krüppel-homolog 1 (kr-h1) and broad-complex (br-c) genes. while met and kr-h1 prevent precocious metamorphosis in pre-final la ... | 2011 | 22174880 |
| karyotypes, male meiosis and comparative fish mapping of 18s ribosomal dna and telomeric (ttagg) n repeat in eight species of true bugs (hemiptera, heteroptera). | eight species belonging to five true bug families were analyzed using dapi/cma3-staining and fluorescence in situ hybridization (fish) with telomeric (ttagg)n and 18s rdna probes. standard chromosomal complements are reported for the first time for deraeocoris rutilus (herrich-schäffer, 1838) (2n=30+2m+xy) and deraeocoris ruber(linnaeus, 1758) (2n=30+2m+xy) from the family miridae. using fish, the location of a 18s rdna cluster was detected in these species and in five more species: megaloceroea ... | 2011 | 24260641 |
| geographical and ecological stability of the symbiotic mid-gut microbiota in european firebugs, pyrrhocoris apterus (hemiptera, pyrrhocoridae). | symbiotic bacteria often play an essential nutritional role for insects, thereby allowing them to exploit novel food sources and expand into otherwise inaccessible ecological niches. although many insects are inhabited by complex microbial communities, most studies on insect mutualists so far have focused on single endosymbionts and their interactions with the host. here, we provide a comprehensive characterization of the gut microbiota of the red firebug (pyrrhocoris apterus, hemiptera, pyrrhoc ... | 2012 | 23017151 |
| cosmopolitan distribution of a trypanosomatid leptomonas pyrrhocoris. | a trypanosomatid species, designated as typing unit 1 (tu1) by sequences of sl rna gene repeats, has been found in the intestine of pyrrhocorids (insecta: heteroptera) in europe, mediterranean, central america and some parts of asia and africa. phylogenetic analysis of the sl repeat sequences has shown that the isolates group in the tree according to their geographic origin. the maximal sequence divergence was observed in parasites from neotropics suggesting the origin within and subsequent migr ... | 2012 | 22341645 |
| next-generation sequencing sheds light on intricate regulation of insect gut microbiota. | next-generation sequencing (ngs) technologies are getting cheaper and easier and hence becoming readily accessible for many researchers in biological disciplines including ecology. in this issue of molecular ecology, sudakaran et al. (2012) show how the ngs revolution contributes to our better and more comprehensive understanding of ecological interactions between gut symbiotic microbiota and the host organism. using the european red firebug pyrrhocoris apterus as a model system, they demonstrat ... | 2012 | 23355979 |
| the effect of adipokinetic hormone on midgut characteristics in pyrrhocoris apterus l. (heteroptera). | digestive processes and the effect of adipokinetic hormone (pyrap-akh) on the amount of nutrients (lipids, proteins, and carbohydrates), and on the activity of digestive enzymes (lipases, peptidases, and carbohydrases) were studied in the midgut of the firebug, pyrrhocoris apterus. the analyses were performed on samples of anterior (am), middle (mm) and posterior (pm) midgut parts. the results revealed that the digestion of lipids, carbohydrates and proteins take place in the acidic milieu. the ... | 2012 | 22119443 |
| adipokinetic hormone exerts its anti-oxidative effects using a conserved signal-transduction mechanism involving both pkc and camp by mobilizing extra- and intracellular ca2+ stores. | the involvement of members of the adipokinetic hormone (akh) family in regulation of response to oxidative stress (os) has been reported recently. however, despite these neuropeptides being the best studied family of insect hormones, their precise signaling pathways in their os responsive role remain to be elucidated. in this study, we have used an in vitro assay to determine the importance of extra and intra-cellular ca(2+) stores as well as the involvement of protein kinase c (pkc) and cyclic ... | 2013 | 23845878 |
| seasonal changes in minor membrane phospholipid classes, sterols and tocopherols in overwintering insect, pyrrhocoris apterus. | ectotherm animals including insects are known to undergo seasonal restructuring of the cell membranes in order to keep their functionality and/or protect their structural integrity at low body temperatures. studies on insects so far focused either on fatty acids or on composition of molecular species in major phospholipid classes. here we extend the scope of analysis and bring results on seasonal changes in minor phospholipid classes, lysophospholipids (lpls), free fatty acids, phytosterols and ... | 2013 | 23845405 |
| endocrine regulation of non-circadian behavior of circadian genes in insect gut. | the linden bug pyrrhocoris apterus exhibits a robust diapause response to photoperiod. photoperiod strongly affected basal levels of circadian gene transcripts in the gut, via the neuroendocrine system. cryptochrome 2 (cry2) mrna level was much higher in diapause promoting short days (sd) than in reproduction promoting long days (ld), while par domain protein 1 (pdp1) mrna level was higher in ld than in sd. the effect of photoperiod on gene expression was mediated by the neurosecretory cells of ... | 2013 | 23811190 |
| photoperiodic plasticity in circadian clock neurons in insects. | since bünning's observation of circadian rhythms and photoperiodism in the runner bean phaseolus multiflorus in 1936, many studies have shown that photoperiodism is based on the circadian clock system. in insects, involvement of circadian clock genes or neurons has been recently shown in the photoperiodic control of developmental arrests, diapause. photoperiod sets peaks of period (per) or timeless (tim) mrna abundance at lights-off in sarcophaga crassipalpis, chymomyza costata and protophormia ... | 2013 | 23986711 |
| complete genome sequence of coriobacterium glomerans type strain (pw2(t)) from the midgut of pyrrhocoris apterus l. (red soldier bug). | coriobacterium glomerans haas and könig 1988, is the only species of the genus coriobacterium, family coriobacteriaceae, order coriobacteriales, phylum actinobacteria. the bacterium thrives as an endosymbiont of pyrrhocorid bugs, i.e. the red fire bug pyrrhocoris apterus l. the rationale for sequencing the genome of strain pw2(t) is its endosymbiotic life style which is rare among members of actinobacteria. here we describe the features of this symbiont, together with the complete genome sequenc ... | 2013 | 23961308 |
| actinobacteria as essential symbionts in firebugs and cotton stainers (hemiptera, pyrrhocoridae). | actinobacteria engage in defensive symbioses with several insect taxa, but reports of nutritional contributions to their hosts have been exceptionally rare. cotton stainers (dysdercus fasciatus) and red firebugs (pyrrhocoris apterus) (both hemiptera, pyrrhocoridae) harbour the actinobacterial symbionts coriobacterium glomerans and gordonibacter sp. as well as firmicutes (clostridium sp. and lactococcus sp.) and proteobacteria (klebsiella sp. and a rickettsiales bacterium) in the m3 region of the ... | 2013 | 23078522 |
| autonomous regulation of the insect gut by circadian genes acting downstream of juvenile hormone signaling. | in temperate regions, the shortening day length informs many insect species to prepare for winter by inducing diapause. the adult diapause of the linden bug, pyrrhocoris apterus, involves a reproductive arrest accompanied by energy storage, reduction of metabolic needs, and preparation to withstand low temperatures. by contrast, nondiapause animals direct nutrient energy to muscle activity and reproduction. the photoperiod-dependent switch from diapause to reproduction is systemically transmitte ... | 2013 | 23442387 |
| effects of prolonged exposure to cold on the spontaneous activity of two different types of filiform sensilla in pyrrhocoris apterus. | we recorded the spontaneous activity of t1 and t2 filiform sensilla from october to may in pyrrhocoris apterus acclimatized to outdoor conditions. the aim of the study was to determine how prolonged exposure to cold affects two closely related mechanosensitive sensilla. we recorded the activity at seven temperatures from 5 to 35 °c. in both sensilla types the activity level was reduced during winter, which correlated to changes in acclimatization temperature (r = 0.7), the reduction was greater ... | 2013 | 23913186 |
| metabolic phosphorylation and excretion of some nucleoside analogues in insects. | after oral administration to the hemipteran insect pyrrhocoris apterus l. (fireburg), the l-enantiomers and certain open-chain analogues of the nucleosides are rapidly converted into the corresponding monophosphates, which are then excreted. this metabolic phosphorylation is almost quantitative; it occurs at the primary as well as at the secondary hydroxylic groups. the process is abolished when the respective nucleoside analogues contain a free carboxylic group. by contrast, the phosphorylating ... | 2014 | 4026989 |
| role of methoprene-tolerant (met) in adult morphogenesis and in adult ecdysis of blattella germanica. | juvenile hormone (jh) represses metamorphosis of young instars in insects. one of the main players in hormonal signalling is methoprene-tolerant (met), which plays the role of jh receptor. using the polyneopteran insect blattella germanica as the model and rnai for transcript depletion, we have confirmed that met transduces the antimetamorphic signal of jh in young nymphs and plays a role in the last nymphal instar moult in this species. previously, the function of met as the jh receptor had bee ... | 2014 | 25072526 |
| a role for taiman in insect metamorphosis. | recent studies in vitro have reported that the methoprene-tolerant (met) and taiman (tai) complex is the functional receptor of juvenile hormone (jh). experiments in vivo of met depletion have confirmed this factor's role in jh signal transduction, however, there is no equivalent data regarding tai because its depletion in larval or nymphal stages of the beetle tribolium castaneum and the bug pyrrhocoris apterus results in 100% mortality. we have discovered that the cockroach blattella germanica ... | 2014 | 25356827 |