hepatitis b surface antigen (australia antigen) in mosquitoes collected in senegal, west africa.during july and august of 1973, 9,198 mosquitoes were collected in the republic of senegal. eight species of mosquitoes were found in the collections: culex thalassius, culex pipiens quinquefasciatus, culex trigripes, culex phillipi, aedes irritans, aedes aegypti, anopheles gambiae, and mansonia sp. specimens were sorted by biological condition; those obviously engorged were designated as (e), females with swollen abdomens not conspicuously blooded were considered gravid (g), and those with norm ...19763983
host feeding patterns of connecticut mosquitoes (diptera: culicidae).blood-engorged coquillettidia perturbans, psorophora ferox, culex, culiseta, and aedes mosquitoes were collected principally by sweep net from salt marsh and woodland habitats in connecticut. of the 570 mosquitoes tested, precipitin tests identified the origins of 517 blood meals and revealed distinct host feeding patterns. aedes mosquitoes fed chiefly on mammals; a. abserratus, a. cantator, and a. vexans showed selectivity for cattle and (or) horses. a. cantator also obtained blood from avian h ...197717310
an entomological survey on the mosquitoes of wuvulu island, papua-new entomological survey in wuvulu island, papua new guinea, in august 1975 and 1976 shows the presence of six mosquito species: aedes (s.) hebrideus, ae. (f.) notoscriptus, ae. (v.) lineatus, ? ae. (l.) dasyorrhus, culex pipiens fatigans and armigeres breinli. the medical significance of these mosquitoes is discussed, with special reference to the problem of dengue virus transmission.197718800
effect of the landscape and climate on the distribution of blood-sucking mosquitoes in murmansk province.according to its orographic characteristics and climate the murmansk region represents a special landscape area of the atlantic-arctic zone with its peculiar zoogeographic characters. this specificity is clearly seen in the distribution of 19 species of bloodsucking mosquitoes over the above territory. abundant and widely encountered are only two species, aedes punctor and ae. communis. 9 species, culiseta alaskaensis, c. bergrothi, aedes pullatus, ae. excrucians, ae. pionips, ae. hexodontus, ae ...197719722
transovarial transmission of rickettsia-like microorganisms in mosquitoes.the wolbachiae found in culex pipiens and the tafahi strain of the a. scutellaris group are small rickettsia-like symbionts of the gonads. they are extrachromosomal self-replicating units that are vertically transmitted through the ovaries. their presence in the only two groups of mosquitoes known to exhibit incompatibility, the fact that they are found in only the tafahi strain, and the loss of incompatibility after removal of wolbachia in c. pipiens are compelling evidence for the role that wo ...197520018
dirofilaria immitis and its potential mosquito vectors in central new york state.screening of 25,822 dog blood samples indicated approximately a 1% infection rate with dirofilaria immitis. dipetalonema reconditum microfilariae were found in approximately 2% of 1,876 feral dogs examined. laboratory experimentation indicated that 6 of 10 local mosquito species examined allowed successful extrinsic incubation of d immitis. indices of experimental infection indicated aedes triseriatus and anopheles quadrimaculatus were excellent hosts for d immitis, but other factors considered, ...197720828
infestation of mosquitoes from the maritime territory by the entomopathogenic fungus, coelomomyces iliensis, under laboratory conditions.the infection of larvae of culex pipiens molestus, c. vagans and c. tritaeniorhynchus (the vector of the virus of japanese encephalitis) with the entomopathogenic fungus coelomomyces iliensis from kazakhstan was carried out in the primorje territory in 1973--1974. at the infection of larvae of c. tritaeniorhynchus with the suspension of infected larvae the mortality was recorded only from 60% of individuals, while at the infection with a content of sporangia--from 36.6% of larvae. somewhat less ...197827745
the lethal effects of the cibarial and pharyngeal armatures of mosquitoes on microfilariae.microfilariae of wuchereria bancrofti and brugia pahangi were killed by the chewing action of the cibarial and pharyngeal armatures and other papillae and spines in the fore-gut of mosquitoes. the proportion of ingested microfilariae that were killed was largely dependent on the presence and shape of the cibarial armature. anopheles farauti no. 1 and anopheles gambiae species a and b have well developed cibarial armatures and killed 36 to 96% of the ingested microfilariae. culex pipiens fatigans ...197830190
the rift valley fever epizootic in egypt 1977-78. 2. ecological and entomological studies.epidemiological factors related to the introduction, spread and maintenance of rift valley fever (rvf) virus were studied during the 1977-78 epizootic in egypt, culex pipiens is the most ubiquitous and prevalent mosquito species in the nile valley and delta. isolation of rvf virus from unengorged c. pipiens, and demonstration of laboratory transmission of the virus by this species, strongly implicate it as the chief vector in egypt. virus transmission to man also occurs by contamination when han ...197944038
toxicity of parasporal crystals of bacillus thuringiensis subsp. israelensis to mosquitoes.toxicity of bacillus thuringiensis subsp. israelensis (onr-60a/who 1897) parasporal crystals to three medically important mosquito larvae is described. the numbers of larvae killed are in relation to crystal dry weight. the crystals are lethally toxic to aedes aegypti linnaeus (mean 50% lethal concentration [lc50] = 1.9 x 10(-4) micrograms/ml), culex pipiens var. quinquefasciatus say (lc50 = 3.7 x 10(-4) micrograms/ml), and anopheles albimanus wiedemann (lc50 = 8.0 x 10(-3) micrograms/ml). purfi ...197944177
esterase polymorphism and sensitivity to dursban organophosphorus insecticide in culex pipiens pipiens populations.esterase polymorphism and dursban (o,o-dimethyl-2-pyridylphosphorothioate) sensitivity have been investigated in 12 natural populations and three laboratory strains of culex pipiens pipiens. this mosquito has two esterase loci, est-1 and est-2, which were shown to code esterases of the b group (aliesterases) but not cholinesterases. no correlation between est-1 polymorphism and dursban sensitivity was found, but the increase of the est-2(0.64) allele in the populations less sensitive to dursban ...197554163
autogenesis vs. esterase polymorphism and chlorpyrifos (dursban) resistance in culex pipiens pipiens l. 197884667
[comparative action of 31 insecticides on chlorpyrifos-sensitive and resistant culex pipiens (l.) larvae in the south of france].in urban and sub-urban areas larval populations of culex pipiens are now resistant to chlorpyrifos. a replacement compound must be found so 31 pesticides were tested against 3 strains: 2 of them were bred in the laboratory (on sensitive and one resistant) and the third one collected in an area treated with agricultural pesticides and chlorpyrifos. the results show that this last compound induces a cross-resistance only to organophosphorus compounds especially to parathion, chlorpyrifos-methyl, p ...197789655
[progressive acquisition of resistance to chlorpyrifos in culex pipiens (l.) larvae in the south of france].a high resistance level has been detected in certain culex pipiens populations after seven years of chlorpyrifos larval treatments in the montpellier area (southern france). the highest rate recorded in 1973 was x 15, in 1974 x 33,3, in 1975 x 47 and in 1976 x 73. the resistance level depends on the application frequency of this larvicide and the various biotope types. "closed populations" are subjected to a higher selection pressure than "open populations". it is now necessary to find a replace ...197789656
laboratory studies with chemosterilized male culex pipiens fatigans for the determination of the optimum quality of release material. 197798438
experimental transmission of wuchereria bancrofti to monkeys.infective larvae of wuchereria bancrofti from laboratory-raised culex pipiens fatigans and aedes togoi mosquitoes fed on human volunteers in jakarta, indonesia (j strain) and kinmen island, china (k strain) were introduced into taiwan monkeys (macaca cyclopis) by subcutaneous inoculation, by foot puncture, or by permitting infected mosquitoes to feed weekly on the monkeys. some animals were splenectomized and others were treated with varying regimens of immunosuppressants. necropsy was done on m ...1979107818
host selection patterns of some pakistan mosquitoes.the host selection patterns of 18 species of pakistan mosquitoes are described, emphasizing the presumed malaria vectors, anopheles culicifacies, an. fluviatilis, and an. stephensi, and the probable vectors of west nile virus, culex pipiens fatigans and cx. tritaeniorhynchus. all species tested, with the exception of cx, p. fatigans, were considered to be essentially zoophilic. few human feeds were recorded for an. annularis (0.7%), an. culicifacies (0.5%), an. fluviatilis (1.1%), an. nigerrimus ...1979110157
laboratory and field evaluation of a growth-regulating compound (th-6040) against culex pipiens fatigans (diptera: culicidae). 1979120899
[occurrence of culex pipiens molestus forsk. in populated areas of the leningrad region].the mosquitoes of culex pipiens molestus first recorded from leningrad as far as 30 years ago have been reported from the settlements of the leningrad district since 1965. the most northern point of their occurrence is marked at 60 degrees 45' n and is removed from leningrad for over 120 km. such spread of mosquitoes to new settlements is associated with the development of multistory housing construction in the country and delivery of imagos from leningrad to the settlements of the district by m ...1975124848
[experience in the control of the mosquito culex pipiens molestus forsk. in leningrad].systematic control of mosquitoes (c. p. molestus) has begun in leningrad since 1968 when undertaken inspections revealed mosquitoes and their aquatic stages in 21.8% of basements. all hatching sites of mosquitoes were registered and sanitary, hydrotechnical and destroying measures were carried out there. during the period of 1968 to 1973 the basements were cleaned, in 509 of them hydroisolation was made and many were dried. anually chemical treatment of basements was undertaken and for 6 years t ...1975127154
[morphological characteristics of culex pipiens in one of the foothill areas of soutern turkmenistan. 2. variability of the form of light bands on the abdominal tergites of females isolated from individual oviposition sites]. 1978148559
[morphological characteristics of culex pipiens in one of the foothill regions of southern turkmenistan. 1. variability of the shape of clear bands on the tergites of the abdomen of the females]. 1978148560
[finding of culex pipiens moletus forskal in murmansk]. 1978149896
[change in the autogeny of a leningrad population of culex pipiens molestus (culicidae)].eight year observations on the autogeny of c. p. molestus have shown that the per cent of autogenous females decreased from 87% (1968) to 25.6% (1976). the population of c. p. molestus from basement apartments of leningrad can be expected to receive a replenishment from free-living c. pipiens.1978149939
[biological characteristics of mosquitoes of the culex pipiens complex (culicidae) in abkhazia].a high abundance of c. p. pipiens and c. p. molestus in the town of sukhumi and its vicinity was recorded from june to october. according to siphonal indexes the 4-th-stage larvae of these mosquitoes differ from each other rather insignificantly. the females of c. p. pipiens exhibit a high fecundity within a warm period of the year which sharply falls by the autumn. during a two-year experiment with a basement micropopulation of c. p. molestus from a non-autogenous form of c. pipiens there was e ...1978153512
nonelectrophoretic genetic variability in mosquitoes: polymorphism for temperature-resistant and temperature-sensitive phosphoglucomutase alleles in culex pipiens.homogenates of single individuals of two natural populations and five laboratory populations of culex pipiens were examined by combining electrophoresis and heat denaturation studies on phosphoglucomutase (pgm). all populations showed a high degree of polymorphism for isoelectrophoretic temperature-resistant (tr) and temperature-sensitive (ts) alleles. formal genetic data on the heat stability differences of the pgm are given. if both electrophoretic and isoelectrophoretic alleles are taken into ...1979161979
host preference of mosquito vectors of japanese encephalitis.the host preference of 4 culex mosquito species collected in miaoli and pingtung counties, taiwan was studied by capillary precipitin method. antisera to alum-precipitated sera of man, bovine, swine, rabbit, horse, dog, cat, mouse, chicken, duck, and pigeon were produced in rabbits and reacted with 758 mosquito blood meals among which reactions to one or more antisera. culex annulus and culex tritaeniorhynchus summorosus showed a great avidity for pig, and culex fuscocephala for bovine. culex pi ...1975181218
apparent propagation of the equine infectious anemia virus in a mosquito (culex pipiens quinquefasciatus say) ovarian cell line.a tissue culture of culex pipiens quinquefasciatus say ovarian cells appeared to support the growth of equine infectious anemia (eia) virus. shetland ponies inoculated with 2nd, 7th, 9th, and 11th passages of mediums harvested from infected tissue culture had clinical signs of the disease and became eia positive on 11, 19, 23, and 43 days after inoculation, respectively.1976183574
[identification of a group a arbovirus isolated in the far east].strains nos. 296 and 260 isolated from aedes vexans and culex pipiens mosquitoes in the ussr far east in 1971 and 1973, respectively, were identified. the size of the viruses was found to be about 50 nm. both strains were pathogenic for 2--3-day-old and 3--4-week-old mice by the intracerebral, subcutaneous and intraperitoneal routes, agglutinated goose red blood cells at the optimal ph 6.0. the strains were identical to each other and by their antigenic structure were classified as semliki fores ...1975240231
ionic antagonism in mosquito larvae, culex pipiens. 1975240602
on the inheritance of susceptibility for infection with wuchereria bancrofti in culex pipiens fatigans.from a colony of c.p.fatigans from monrovia showing 21.6% susceptibility of w. bancrofti a refractory strain could be selected but not a highly susceptible one. experiments to select a refractory strain out of the highly susceptible colony from delhi failed. from these results and those of the crossing experiments between the selected refractory strain from monrovia and the delhi colony it appears that in the mosquito population from monrovia susceptibility for w. bancrofti is not dominating ref ...1977324054
some aspects of transmission of wuchereria bancrofti and ecology of the vector culex pipiens fatigans in pondicherry. 1977336534
comparative susceptibility to wuchereria bancrofti of culex pipiens fatigans delhi strain and of strains cytoplasmically incompatible with it. 1977355132
abortive development of wuchereria bancrofti in a west african strain of culex pipiens fatigans.the detailed morphology of the larvae of wuchereria bancrofti developing in a refractory strain of culex pipiens fatigans from liberia, west africa, has been described. the abortive development of the parasite in the thoracic muscles of the mosquito was characterized mainly by: (i) retardation or complete failure of initial division of the g-cell, (ii) partial or complete encapsulation of developing larvae, especially at the anal and excretory vesicle areas of late first-stage, (iii) breakdown o ...1978364800
loss of filarial larvae in a natural mosquito population.analysis of log normal parasite densities of wuchereria bancrofti in the mosquito culex pipiens fatigans collected in the suburbs of colombo, sri lanka, has shown a decreasing parasite load with age of infection. the median density of microfilarial intake in the natural population was 10.3, but this had decreased to 2.6 by the infective stage. of the total microfilariae ingested, 51.9% were found in the thorax 12--17 hours after infection of the mosquitoes in the laboratory. further decrease in ...1978367299
[culex pipiens fatigans wiedemann in tropical africa: its importance and its control (author's transl)].improvement in communications, unchecked urbanization and use of inadequate insecticides have promoted widespreading and proliferation of c.p. fatigans in tropical africa. this mosquito is a pest for man but also a main vector of bancroftian filariasis. various sanitation measures and insecticidal control are now available to destroy it; these control methods are indicated.1978370500
studies of the susceptibility of culex pipiens fatigans from non-endemic filarial areas to urban wuchereria bancrofti. 1979386965
[sexual receptivity of the female and insemination power of the male culex pipiens autogenicus (diptera, culicidae). the cases of strict monogamy and occasional polygamy].females of culex pipiens autogenicus generally have two refractory periods: post-emergence refractory period (during the first 48 hrs. after emergence) and post-insemination refractory period. males of culex pipiens autogenicus can inseminate 2 to 3 females. after the 4th insemination he can no longer completely fulfill his reproductory role. therefore the female can inseminated by another male.1977405124
inheritance of resistance to permethrin in culex pipiens quinquefasciatus. 1979429679
[tests of altocide ps 10, a preparation with juvenile activity, against culex pipiens molestus (forsk; 1775) mosquitoes that breed in basements]. 1979431493
[effect of the imaginal feeding of culex pipiens molestus forsk. on female fertility, the development times and progeny survival]. 1979431494
ultrastructure of midgut events in the pathogenesis of bacillus sphaericus strain ssii-1 infections of culex pipiens quinquefasciatus larvae.the fate of bacillus sphaericus strain ssii-1 cells ingested by culex pipiens quinquefasciatus (= c. pipiens fatigans, c. fatigans, c. quinquefasciatus of authors; diptera: culicidae) larvae and the cytological events preceding death of the host were observed using electron microscopy. bacillus sphaericus cells were digested rapidly in the anterior and central midgut. the outer cell wall layer and cytoplasmic ground substance disappeared soon after ingestion. cytolysosomes became prominent in mi ...1979436015
investigations on the presence of antibodies to tahyna virus in romania.serological results are presented of the hai reaction to tahyna virus performed in 1,749 apparently healthy subjects from two countries of romania where culex pipiens mosquitoes occur frequently, in 113 febrile patients (some of which exhibited signs of interstitial pneumonia) and in 675 domestic animals (swine, cattle, sheep and goats).1979462795
essential fatty acid for the mosquito culex pipiens: arachidonic acid. 1979489998
the genetics of hexokinase in a mosquito, culex pipiens.the genetics of hexokinase (hk) variants in a mosquito, culex pipiens l., was studied using starch gel electrophoresis. three isozymic forms of hk, all migrating anodally, were present in all three body regions, but in differing proportions. no obvious differences in specificity for three hexose sugars was detected among the three isozymic bands. however, qualitative differences in staining intensity indicate the following order of substrate affinity: glucose greater than fructose greater than m ...1979535725
st. louis encephalitis virus transmission following multiple feeding of culex pipiens pipiens (diptera: culicidae) during a single gonotrophic cycle. 1979537010
comparative studies of the mosquito-larval toxin of bacillus sphaericus ssii-1 and 1593.two strains of bacillus sphaericus. ssii-1 and 1593, were bioassayed for toxic activity against second-instar larvae of the mosquito culex pipiens quinquefasciatus. it was found that strain 1593 developed a level of toxicity 3000 times that of strain ssii-1. although the toxic activity of b. sphaericus ssii-1 was relatively unchanged throughout growth, an increase in activity of strain 1593 occurred as the bacteria began to sporulate. strain differences were examined by (i) growth cycle experime ...1979540250
experimental hibernation studies in culex pipiens (diptera: culicidae): reactivation of ovarian development and blood-feeding in prehibernating females. 1979544816
establishment of a cell line from larvae of culex pipiens fatigans and its susceptibility to infection with some group c arboviruses. 1979550225
[comparison of different characters as a function of the degree of inbreeding of culex pipiens (author's transl)]. 1978553500
[ability to infect larvae of culex pipiens molestus forsk. (diptera, culicidae) by means of entomophilic nematodes, neoaplectana feltiae carpocapsae stan., 1974 (dd 136 strain) rhabditoidea, steinernematidae)]. 1977561485
segregation of cytoplasmic incompatibility properties in culex pipiens fatigans.maternally inherited variants, which arose within a laboratory colony of culex pipiens fatigans, have been studied by rearing cultures from single egg rafts. segregation, i.e, variation of cytoplasmic incompatibility properties between the male progeny of individual females, was demonstrated. also, from the daughters of individual females, sub-lines were derived within which all the males showed the same incompatibility or compatibility properties. among the descendants of tetracycline-treated i ...1977562815
studies on naturally occurring filarial infections in dogs in lebanon. i. dipetalonema reconditum.a survey for filarial parasites was carried out on dogs in lebanon. the peripheral blood was examined for microfilariae and the skins and carcasses for adult worms. three methods were used for blood examination: (a) thick blood films stained with giemsa; (b) a modified knott's technique (methylene blue stained); (c) sodium citrate technique. two species of filarial worm were found, dipetalonema reconditum and another species of dipetalonema which will be described in a later paper. the morpholog ...1978566087
[entomophthorosis of culex pipiens (culicidae) mosquitoes breeding in basements].foci of mycosis of c. p. pipiens and c. p. molestus caused by the parasitic fungus entomophthora conglomerata sorok. were found out in basements flooded with water. the conditions prevailing in the foci, sites of infection of mosquitoes and seasonal changes in the epizootic process are described. developmental periods of conidiospores in mosquitoes were established experimentally. entomophthorosis epizootia was found to limit the possibilities of mosquitoes to scatter from the hatching sites and ...1979571593
[daily and seasonal changes in the oviposition activities of culex pipiens pipiens l. (author's transl)].the oviposition activity of c. p. pipiens during summer and autumn has been investigated at two breeding sites in west and north germany. the egg rafts were collected and counted daily or hourly. soon after its begin oviposition reached a high peak and then decreased sharply and faded out towards sunrise. there was an obvious correlation between the hourly maximum number of egg rafts deposited and nightfall. the peak of oviposition regularly followed the sunset with one hour delay. it shifted wi ...1979575447
bancroftian filariasis in puerto limón, costa four neighborhoods of puerto limón, a caribbean coastal city in a tropical rainforest area of costa rica, examination of 1-ml samples of night blood from 1,142 randomly selected, and 1,196 associated, persons by the knott and filter-chamber techniques revealed microfilariae of wuchereria bancrofti in about 3% of the 2,338 samples. the frequency of infection was higher in males (3.9%) than in females (1.9%), higher in persons of black (4.1%) than of white (1.0%) race, and highest in persons ag ...1977596512
the influence of the gene sb in culex pipiens on the development of sub-periodic brugia malayi and wuchereria bancrofti.the gene sb (filarial susceptibility, brugia pahangi) in culex pipiens controls the development also of sub-periodic b. malayi, but has no influence on the development of periodic wuchereria bancrofti (ceylon strain). c.p. fatigans (kuala lumpur), c.p. molestus (london) and aedes aegypti (re fm strain) were all susceptible to the ceylon strain of w. bancrofti, with susceptibility rate of 90.3%, 92.9% and 52.6% respectively. however, a low proportion of the larvae in a. aegypti developed to matur ...1977596959
on the escape of infective filarial larvae from the mosquitoes.experimentally infected females of culex pipiens fatigans carrying infective larvae of wuchereria bancrofti were fed, on the 16th day p.i., on four different solutions, which were offered "cold" (24 degrees c) or "warm" (34 degrees c) in petri dishes as open fluids. thus the sucking mosquitoes did not have to bend their labia. only the "warm" human serum stimulated any considerable number of infective larvae (24.8%) to leave the mouthparts of the mosquitoes. 1289 infective c. fatigens females lo ...1977601855
isozymes of culex pipiens quinquefasciatus (diptera: culicidae). ii. genetics of an alcohol dehydrogenase. 1977609079
hematophagous insects as vectors for frog trypanosomes.experimental infections of three hematophagous arthropods (rhodnius prolixus, aedes aegypti, and culex pipiens) with a trypanosome of the trypanosoma rotatorium complex found in the frogs hyla crepitans and leptodactylus insularum revealed that a. aegypti is a good host for the flagellate; the course of development in the intestinal tract of the mosquito is described from 15 minutes to 168 hours. c. pipiens showed only low intestinal infections and r. prolixus did not permit development of the p ...1977615322
the larvicide effect of some local and foreign chemical products (insecticides and detergents) on the anopheles labranchiae atroparvus and culex pipiens autogenicus. 1977615572
evaluation of the d3 cytoplasmic incompatible strain of culex pipiens fatigans in laboratory and field cages. 1977615851
further studies on variation of cytoplasmic incompatibility in the culex pipiens complex. 1977615852
some observations on resting and swarming behaviour of culex pipiens fatigans in an urban situation. 1977615854
a study on some aspects of culex pipiens fatigans population in an urban area, faridabad, northern india. 1977615856
the density dependence of larval mortality of culex pipiens fatigans in an urban situation and prediction of its effects on genetic control operations. 1977615857
mass rearing of culex pipiens fatigans under ambient conditions. 1977615858
isolation of st. louis encephalitis virus from overwintering culex pipiens mosquitoes.two strains of st. louis encephalitis virus were isolated from overwintering mosquitoes collected in maryland and pennsylvania during january and february 1977. there isolations from culex pipiens constitute evidence that a mosquito-borne flavivirus can persist in a vector mosquito in temperate climates during the winter season.1978628843
amino acid requirements of the mosquito culex pipiens: asparagine essential. 1978632612
toxic activity of bacillus sphaericus ssii-1 for mosquito larvae.using larvae of the mosquito culex pipiens var. quinquefasciatus as a bioassay system, we have verified an earlier proposal that pathogenicity of bacillus sphaericus ssii-1 is a toxin-mediated rather than an infectious process. chloroform or ultraviolet-light treatments that decreased the viable count of ssii-1 cells by 4 or 5 logs did not significantly alter the ability of the bacterial cells to kill larvae. three lines of evidence indicated that toxic activity was not related to sporulation: ( ...1978640722
[optimizing laboratory cultures of insects, for example culex pipiens molestus forsk. (diptera, culicidae) mosquitoes]. 1978645208
induction of high resistance to permethrin in culex pipiens quinquefasciatus. 1978649829
a light and electron microscope study of rickettsia-like organisms in the ovaries of mosquitoes of the aedes scutellaris group.the ovaries from some members of the aedes scutellaris group were examined by light and electron microscopy to locate rickettsia-like organisms, and culex pipiens fatigans was used as a control. it was found that light microscopy was unsatisfactory for this purpose since none of the available staining techniques demonstrates the organisms clearly and diagnostically. with the electron microscope it was shown that the organisms were by no means as common in the mosquitoes of the a. scutellaris gro ...1978666398
follicle cell bridges in the mosquito ovary: syncytia formation and bridge the mosquito, culex pipiens quinqefasciatus, the follicle cells enveloping the oocyte and the nurse cells are connected by intercellular bridges. the bridges are formed by incomplete cytokinesis, and they persist for more than 30 h after their formation. reconstructions from serial sections showed that one syncytial group contained at least 32 cells; several cells continued outside the series. the cells in a syncytium divide asynchronously; this results in an irregular, branched orgainzation. ...1978670316
the ultrastructure of the rickettsia-like microorganism wolbachia pipientis and associated virus-like bodies in the mosquito culex pipiens. 1978671578
autogeny in east african culex pipiens quinquefasciatus (=fatigans) 1978675795
[dynamics of populations in an urban and underground resting place of culex pipiens l. (diptera, culicidae) (author's transl)].an urban and underground resting place of culex pipiens has been examinated during one year. many females (28% in september, 70% in january) do not find sexual partners. the cause is a mixing of autogenous and anautogenous forms in the place even if it seems perfectly closed.1978677724
meiotic chromosome pairing and synaptonemal complex transformation in culex pipiens oocytes.the synaptonemal complexes of the oocytes of the mosquito culex pipiens quinquefasciatus have been reconstructed from serial sections. a diffuse structure, probably a chromocenter composed of centromeric heterochromatin, was present during pachytene. as no synaptonemal complexes were visible inside the chromocenter the continuity of the 2 arms of a bivalent was lost. the telomeric ends were clustered on a small area of the nuclear membrane in a bouquet arrangement; they were associated in pairs, ...1978743906
[action of some chemical products--insecticides and detergents--on the larvae of mosquitoes of anopheles labranchiae atroparvus and culex pipiens autogenicus species].the larvicide effects of some insecticides and detergents on the anopheles labranchiae atroparvus species--laboratory colonie--and culex pipiens autogenicus species, living in flooded basements of some block-houses in the town of slobozia, were estimated. these products were classified in some categories, depending on their effects: 1. knock-down effect products ; 2. products having a relatively strong effect ; 3. products having a slow effect ; 4. products with a slight effect. remanence tests ...1978749150
[inventory of the culcinae in balagne (corsica)].we have drawn up the faunistic inventory of culicinae in balagne (corsica) in late summer. the list shows the following species (in order of frequency): culex hortensis, culex pipiens, culex impudicus, culex territans (?), culiseta longiareolata, culiseta annulata, culiseta subochrea, aedes mariae, aedes caspius, aedes vexans, anopheles claviger, anopheles maculipennis. we have observed the important recession of the maculipennis complex (only one female catched indoor) and the abundance of anop ...1978754888
standard curves for nuvacron, malathion, sevin, ddt and kelthane tested against the mosquito culex pipiens l. and the microcrustacean daphnia magna straus.the fourth instar larvae of culex pipiens l. and adults of microcrustacean daphnia magna straus were reared under standardized conditions and used as bioassay test organisms for the preparation of the standard log concentration--probit (lc--p) regression lines for each of the following pesticides: nuvacron, malathion, sevin, ddt and kelthane. when the above pesticides were tested against the larvae of c. pipiens, the lc50 values (in ppm) ranged as follows: nuvacron 0.0014--0.0019, malathion 0.00 ...1975807992
"curing" wolbachia infections in culex pipiens. 1975808618
[host range of drosophila melanogaster c virus among diptera and lepidoptera (author's transl)].the host range of the c picornavirus of drosophila melanogaster was studied, using numerous strains of drosophila together with four other genera of diptera and two species of lepidoptera. c virus was injected into the different hosts and serially passaged in them. the extracts from each passage were biologically assayed on virus free d. melanogaster. four different situations were found. 1) a high level of multiplication leading, in 45 strains of drosophilidae, to the early death of the hosts. ...1976823856
population analysis of culex pipiens fatigans wied. (diptera: culicidae) under laboratory conditions. 1977845884
[culex pipiens fatigans: labeling of tissues of normal and infected (plasmodium cathemerium) females after feeding on tritiated amino acids (author's transl)].normal and infected culex females were fed 11 different amino acids. these substances were labeled with tritium and each was given separately in glucose solution. after the uptake the marker appears first in crop, cardia and midgut. later on the other tissues get labeled more or less. it seems that the labeling follows a characteristic pattern for each amino acid. essential amino acids are taken up intensively; for example leucine not only in the midgut epithelium but also in the ovary and the f ...1977848081
chromosomal polymorphism in different populations of culex pipiens fatigans during meiosis. 1977877318
dietary nucleotide requirements of the mosquito, culex pipiens. 1977886193
selection for partial compatibility with aged and previously mated males in culex pipiens fatigans (diptera: culicidae). 1977903940
identification of culex species by electrophoresis.this paper extends the usefulness of polyacrylamide gel electrophoresis to studies of mosquito taxonomy and mosquito vector ecology. using a newly developed double staining technique, it is possible to unambiguously separate several species of culex mosquitoes found in northern indiana. these include culex restuans, culex pipiens pipiens, and culex territans. preliminary work indicates that culex pipiens quinquefasciatus and culex salinarius can also be identified by this method. this technique ...1977907038
[a new report of naturally anautogenous and stenogamic populations of culex pipiens pipiens l. in the south of france (author's transl)].the presence of an anautogenous and stenogamic population of culex pipiens pipiens in languedoc, france, is reported. the anautogeny was confirmed through 10 generations. a callot morphogram corresponded to the anautogenous form. these results raise again the question of the type of relationships, genetic or ecological, of the characters classically associated with autogeny.1977907293
susceptibility to brugia pahangi of geographical strains of culex pipiens fatigans.five strains of culex pipiens fatigans from kuala lumpur, tanga, bobo dioulasso, ibadan and maracay were tested for susceptibility to brugia pahangi. the mosquitoes were membrane-fed on infected blood in which the parasite density ranged from 1-3 to 20-4 mff/mm(3). the susceptibility rates were low, and were not directly related to the parasitaemia. if the susceptible individuals represent homozygotes for the gene sb (the gene controlling susceptibility to b pahangi in c. pipiens), the gene freq ...1977921367
the effect of anticoagulant on the early migration of brugia pahangi microfilariae in culex pipiens susceptible or refractory to b. pahangi. 1977921368
the fate of ingested brugia pahangi microfilariae in susceptible and refractory strains of culex pipiens and aedes aegypti.the uptake and migration of microfilariae of brugia pahangi in susceptible and refractory culex pipiens and aedes aegypti were compared after membrane-feeding the mosquitoes on infected blood and anti-coagulant. there was no difference between the strains within each species in the pattern of migration, but in c pipiens only 24% of the microfilariae reached the thorax whereas in a. aegypti 73-6% were successful. in both susceptible strains the filariae in the thorax developed normally to maturit ...1977921369
[gonotrophic relations in mosquitoes, culex pipiens l., in repeated bloodsucking during 1 cycle]. 1977927356
persistence in continuous light of a circadian rhythm in the mosquito culex pipiens fatigans wied. 1976934281
[effect of larval feeding and imaginal supplementary nutrition on the degree of autogeny and fertility of culex pipiens molestus mosquitoes at different periods of the year].studies of ovogenesis of c. p. molestus at different food regimes (water, sugar, blood) have shown that in winter the imaginal feeding with carbohydrates nearly twice increases the degree of autogenity and fecundity of these mosquitoes. in warm seasons the carbohydratous feeding does not affect the autogenity but increases the fecundity of females and maturation of their ovaries. poor larval feeding decreases only slightly the autogenity and sharply decreases the fecundity of females. blood feed ...1976940685
[gonotrophic dissociation in culex pipiens pipiens l. (author's transl)].under certain conditions gonotrophic dissociation has been observed in culex pipiens pipiens. to contribute to a better understanding of the factors which govern the appearance of this phenomenon and of its ecological importance a population in northern germany has been investigated. follicular development, feeding activity and occurrence of gonotrophic dissociation were examined in females obtained from wild-caught larval stages and kept under outdoor conditions after emergence in july and augu ...1976943871
esterases in the mosquito culex pipiens pipiens l: formal genetics and polymorphism of adult esterases.the genetics of two esterase loci active in autogenous adults of the mosquito culex pipiens pipiens l. has been studied by means of starch gel electrophoresis. three alleles at the est-1 locus and eight at the est-2 locus are described. both loci have a null allele. active alleles are codominant and there is no hybrid enzyme in heterozygotes. the est-1 locus codes esterases preferentially hydrolyzing alpha-naphthylacetate and the est-2 locus esterases preferentially hydrolyzing beta-naphthylacet ...1976971293
inheritance of 6-phosphogluconate dehydrogenase variants in culex pipiens quinquefasciatus say.the formal genetics of two variants of a 6-phosphogluconate dehydrogenase locus of the adult mosquito, culex pipiens quinquefasciatus, was analyzed by starch gel electrophoresis. these two alleles, pgdf and pgds are codominant, and autosomally inherited, and appear to be linked to the pgm locus by 27 crossover units in linkage group iii.1976972249
paracentric inversion in culex pipiens. 1976978686
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