estimation and economic implications of lone star tick (acari: ixodidae) infestation on weight gain of cattle, bos taurus and bos taurus x bos indicus. 19873584640
evidence for regurgitation by amblyomma americanum.western blot analysis of amblyomma americanum-derived midgut extracts using tick-resistant rabbit and guinea pig antisera demonstrated several unique polypeptides ranging from 7 to 355 kda. these polypeptides were not observed in similar blots of salivary gland extracts or serum from the respective host animals. the data from this study suggest that female a. americanum ticks regurgitate gut material during feeding. such a finding explains the ability of immunization with gut-derived preparation ...19883420794
the ecology and behavior of the lone star tick (acarina: ixodidae). 3. the effect of season on molting time and post-molt behavior of engorged nymphs and adults. 19734707757
comparison of rates of infection by the lyme disease spirochete in selected populations of ixodes dammini and amblyomma americanum (acari: ixodidae).at a major endemic focus in new jersey, 50% of 290 adult ixodes dammini collected in the fall of 1984 were infected with the lyme disease spirochete (borrelia burgdorferi), which was statistically higher than the rate found in the 202 adult ticks (39.6%) examined during the spring. neither sex nor site of collection within the focus significantly affected the infection rate. the observed infection rates were similar to those reported in endemic areas of new york and connecticut. borrelia burgdor ...19863577494
serum basophil-stimulating activity in the guinea-pig during induction of basophilic responses to ovalbumin and tick feeding.we have described functional and biochemical characteristics of a distinct t-cell dependent guinea-pig basophil-stimulating factor (bsf), measured using a sensitive 7-day bone marrow culture assay, standardized with high-activity bsf present in serum-free splenic cell-conditioned medium (cm). in the present studies, the in vivo relevance of bsf was explored during protocols of induction of peripheral blood or tissue basophil responses to ovalbumin (oa) injection or amblyomma americanum tick feed ...19863733145
electrophoretically detectable protein variation in natural populations of the lone star tick, amblyomma americanum (acari: ixodidae).nine populations of amblyomma americanum (l.) were examined electrophoretically for variation of 21 enzymes. only three enzymes were not polymorphic and the average heterozygosity per individual (h) for the species was 0.085 with a range of 0.077 to 0.110, comparing well with values in other arthropods. the average nei identity value for pairwise comparisons among the nine populations was high, 0.994 +/- 0.004 (i +/- sd). these high identity values and the absence of geographic structuring of th ...19863744877
spotted fever group rickettsiae in the lone star tick, amblyomma americanum (acari: ixodidae). 19863772952
the ecology and behavior of the lone star tick (acarina: ixodidae). v. abundance and seasonal distribution in different habitat types. 19734779928
density perturbation in populations of amblyomma americanum (acari: ixodidae) in beef cattle forage areas in response to two regimens of vegetation management. 19863950182
production system-based model for defining economic thresholds in preweaner beef cattle, bos taurus, infested with the lone star tick, amblyomma americanum (acari: ixodidae). 19863950186
rickettsia-like organisms in ticks and antibodies to spotted fever-group rickettsiae in mammals from northern mississippi.studies were conducted from april through august during 1974 and 1975 on 30 randomly selected trapping sites in wall doxey state park, holly springs national forest, and 1.6 km south of the park in marshall county, mississippi to provide information on the occurrence of ticks involved in the maintenance and transmission of spotted fever-group rickettsiae in nature. of 365 animals (14 species) collected, 186 (51%) were parasitized by 4,169 ticks. species of ticks collected included: dermacentor v ...19853923212
the effect of avermectins on feeding, salivary fluid secretion, and fecundity in some ixodid ticks.we tested the effects of the potent acaricides, avermectin b1a (avm) and 22,23-dihydroavermectin b1 (ivermectin; ivm) when injected directly into partially fed and fully engorged female ticks. when injected into small ticks (amblyomma hebraeum koch), neither drug (up to 100 micrograms/kg b.w.) inhibited subsequent engorgement nor affected oviposition latency, weight of total egg mass laid nor viability of laid eggs. at higher concentrations (1000 and 5000 micrograms/kg b.w.), avm and ivm were ma ...19863451859
apparatus for artificial infestation of pastured beef cattle with the lone star tick (acari: ixodidae). 19853998270
systemic activity of closantel for control of lone star ticks, amblyomma americanum (l.), on cattle.cattle were treated once at 5 mg/kg orally or subcutaneously or daily at 0.1-5 mg/kg orally or 0.1-1 mg/kg subcutaneously with closantel, n-[5-chloro-4-[(4-chlorophenyl)cyanomethyl]-2-methylphenyl]-2-hydroxy-3, 5-diiodobenzamide, and numbers and weights of engorged females, weights of egg masses and hatch of eggs of lone star ticks, amblyomma americanum, were recorded. effectiveness of treatments on reproduction was determined by comparing total estimated larvae (el) (el = wt. egg mass x est. % ...19853870959
influence of deer exclusion on populations of lone star ticks and american dog ticks (acari: ixodidae). 19863722591
intradermal infestation of a red fox (vulpes vulpes) by the lone star tick (amblyomma americanum). 19863951048
acquisition and expression of resistance by bos indicus and bos indicus x bos taurus calves to amblyomma americanum infestation.purebred and crossbred bos indicus calves were infested 1, 2, or 3 times with 10 female and 5 male amblyomma americanum. resistance was acquired by both the purebred and the crossbred calves after 1 infestation and resulted in statistically significant decreases in the percentages of females that engorged, the mean weights of engorged females, and the mean weights of egg masses. comparisons between breeds of the percent of female ticks that engorged during the first and second infestations indic ...19853998956
measurement of physical parameters to determine the suitability of modified woodlots as lone star tick habitat. 19715153596
a seed tick infestation of the conjunctiva: amblyomma americanum larva.ticks commonly infest humans but rarely bite the eyes. they are vectors of disease; therefore, rapid and complete removal is important. their attachment can be so secure that removal is difficult or hazardous. we excised a larval form of amblyomma americanum from a woodsman's conjunctiva.19873566026
evaluation of five popular methods for tick removal.five methods commonly advocated for tick removal from a human or domestic animal were evaluated. the application of petroleum jelly, fingernail polish, 70% isopropyl alcohol, or a hot kitchen match failed to induce detachment of adult american dog ticks (dermacentor variabilis say) attached for either 12 to 15 hours or three to four days. use of forceps or protected fingers enabled satisfactory removal of 29 adult american dog ticks without leaving the mouthparts or attachment cement in the host ...19854000801
surveillance of lyme disease in the united states, 1982.lyme disease is a tick-borne illness that has been reported from three regions in the united states--the northeast, midwest, and west--which correspond to the distribution of the recognized vectors of the disease, ixodes dammini and ixodes pacificus. in 1982, a surveillance system designed to define the morbidity and geographic distribution for lyme disease by using a clinical case definition received information on 491 definite cases and 38 probable cases. of the definite cases, 489 were acquir ...19853998509
human infestation by amblyomma americanum larvae ("seed ticks"). 19854002011
resistance to ixodid tick infestation induced by administration of tick-tissue culture cells.primary tissue culture cells of developing larvae of amblyomma americanum were administered to guinea-pigs never previously exposed to ixodid ticks. guinea-pigs were given 1 x 10(6) primary culture cells on days 0, 7 and 21 by subcutaneous injection and challenged with male and female a. americanum on day 35. a significant degree of induced host tick resistance was expressed by reduced engorgement weight of females, reduced oviposition by those females which did obtain a blood meal, and by death ...19854083961
ultrastructure of haller's organ in the tick amblyomma americanum (l.). 19724334800
weight changes in individual feeding amblyomma americanum female ticks. 19854093818
resistance of purebred brahman, hereford, and brahman times hereford crossbred cattle to the lone star tick, amblyomma americanum (acarina: ixodidae). 19744455918
hematological changes in white-tailed deer fawns, odocoileus virgianianus, infested with theileria-infected lone star ticks. 19734202517
survival of the lone star tick (acari: ixodidae) under flooding conditions: a laboratory evaluation. 19863805482
control of the lone star tick on cattle. 19676081042
amblyomma americanum: physiochemical isolation of a protein derived from the tick salivary gland that is capable of inducing immune resistance in guinea pigs.crude salivary gland derived proteins from amblyomma americanum ticks were analyzed by physiochemical (gel filtration and ion exchange chromatography) and immunochemical guinea pig igg1 (anti-tick immunoaffinity column) techniques for the presence of antigens responsible for the induction of host immune resistance responses. gel filtration (g-75 sephadex) and ion exchange (diethyl aminoethyl cellulose) chromatography of crude salivary gland antigen yielded multiple fractions, but only one fracti ...19863720900
the ecology and behavior of the lone star tick (acarina: ixodidae). iv. the daily and seasonal activity patterns of adults in different habitat types. 19734744033
permeability of tarsal sensilla in the tick amblyomma americanum l. (acarina, ixodidae). 19724647364
field method for evaluating the effectiveness of acaricides against lone star ticks (acari: ixodidae) on domestic dogs. 19853973208
control of 36c1 uptake by isolated salivary glands of the lone star tick. 19744412631
a method of collecting nymphal and adult lone star ticks, amblyomma americanum (l.) (acarina: ixodidae), from woodlots. 19725036200
2,6-dichlorophenol, sex pheromone of the lone star tick.the compound 2,6-dichlorophenol was identified from female lone star ticks, amblyomma americanum, and is believed to be a sex pheromone of this arthropod. the natural occurrence of a chlorinated organic compound in a land animal is new. the presence of similar compounds of exogenous origin is common in animals, but efforts to implicate an outside source for the halogenated phenol have failed.19725054146
the effects of desiccation and rehydration on the lone star tick. 19734773930
the ecology of the lone star tick, amblyomma americanum (l.), in two contrasting habitats in virginia (acarina: ixodidae). 19715153583
the ecology and behavior of the lone star tick (acarina: ixodidae). ii. activity and survival in different ecological habitats. 19715153595
lone star tick: laboratory tests of acaricides. 19734770947
engorgement and reproduction of lone star ticks (amblyomma americanum (l.)) treated with gamma-radiation. 19665296972
injury thresholds and production loss functions for the lone star tick, amblyomma americanum (acari: ixodidae), on pastured, preweaner beef cattle, bos taurus. 19854056195
chemo-attraction in the lone star tick (acarina: ixodidae). i. response of different developmental stages to carbon dioxide administered via traps. 19725057498
effect of age on the susceptibility of nymphs of the lone star tick to insecticides. 19705488795
fine structural analysis of palpal receptors in the tick amblyomma americanum(l.). 19725042252
fine structure of the central nervous system of dermacentor variabilis (say), amblyomma americanum (l.), and argas arboreus kaiser, hoogstraal, and kohls (ixodoidea). 19744852052
preliminary observations on controlled burning for lone star tick (acarina: ixodidae) control in woodlots. 19725080432
wear and wash persistence of permethrin used as a clothing treatment for personal protection against the lone star tick (acari: ixodidae). 19826123602
the ecology and behavior of the lone star tick (acarina: ixodidae). i. the relationship between vegetative habitat type and tick abundance and distribution in cherokee co., oklahoma. 19715118876
insecticides for control of the lone star tick tested in the laboratory and as high- and ultra-low-volume sprays in wooded areas. 19685662002
growth in lone star ticks, amblyomma americanum (acari: ixodidae), feeding on cattle: a laboratory study. 19827120307
arbovirus studies in the ohio-mississippi basin, 1964-1967. vii. lone star virus, a hitherto unknown agent isolated from the tick amblyomma americanum (linn). 19695810802
ultralow-volume mists of chlorpyrifos from a tractor-mounted blower for area control of the lone star tick (acari: ixodidae). 19846210316
immunohistochemical localization of adenosine 3':5'-cyclic monophosphate in female ixodid tick amblyomma americanum (l.) salivary glands.localization of adenosine 3':5'-cyclic monophosphate (cyclic amp) in alveoli of salivary glands of female amblyomma americanum (l.) was accomplished with an indirect immunofluorescent technique. little cyclic amp fluorescence was seen in type i alveoli in glands of unfed females but considerable fluorescence was seen in type i alveoli of glands obtained from females that had fed. the most intense cyclic amp fluorescence was observed in complex granular cells of type ii and iii alveoli in glands ...19836298395
a dopamine sensitive adenylate cyclase in the salivary glands of amblyomma americanum (l.).1. enzyme activity, basal or dopamine-stimulated (10 microm), was linear with time to 25 min and with protein concentration to 0.8 mg protein/ml of final assay volume. activity was maximal between ph 7.0 and 7.5. 2. mg2+ maximally stimulated basal or dopamine-sensitive adenylate cyclase activity at about 4 mm. 3. adenylate cyclase had a km of 0.042 mm for atp and maximum velocities for basal and dopamine-stimulated activity of 107 and 179 pmol cyclic amp formed/mg protein per min, respectively. ...19826125338
mating behavior and reproduction of the lone star tick, amblyomma americanum. 19705449398
characterization of tick antigens inducing host immune resistance. i. immunization of guinea pigs with amblyomma americanum-derived salivary gland extracts and identification of an important salivary gland protein antigen with guinea pig anti-tick antibodies.guinea pigs immunized by subcutaneous injection of an emulsion of incomplete freund's adjuvant (ifa) containing tick salivary gland extract antigens (sga) from partially fed female ticks expressed a significant level of tick rejection when challenged 17 days later. this level of tick rejection was similar to animals actively sensitized by tick feeding and challenged at the same time. sga emulsified with complete freund's adjuvant (cfa) or administered with saline was ineffective. however, ticks ...19846491289
aerial application of diazinon granules for area control of the lone star tick (acari: ixodidae). 19846512070
area control of larvae of the lone star tick (acari: ixodidae) with acaricides. 19836186711
antibody- and cell-mediated immune resistance by guinea pigs to adult amblyomma americanum ticks.naive and actively and passively sensitized guinea pigs were infested with adult amblyomma americanum ticks. naive hosts allowed for 75-81% tick yield, 518-581 mg mean tick weight and an average tick feeding period of 12-13 days. actively sensitized and challenged hosts, however, allowed only 47% tick yield (38.9% rejection), replete individuals were significantly reduced in weight (66.1% weight decrease) and required slightly longer time to feed (14 days). passively sensitized hosts were given ...19827149113
economic thresholds for lone star ticks (acari: ixodidae) in recreational areas based on a relationship between co2 and human subject sampling. 19836408150
ticks on white-tailed deer fawns from southern illinois.seventy-six white-tailed deer (odocoileus virginianus (zimmermann] fawns captured on crab orchard national wildlife refuge in southern illinois during june-july 1980-1983 were aged and examined for ticks. the prevalence of ticks (amblyomma americanum (linnaeus, 1758) and dermacentor variabilis (say, 1821] was 80%; intensity of infestation ranged from one to 123 ticks per fawn, averaging 21.6. tick intensity correlated poorly with age suggesting that there were other, more important determinants ...19846530716
water balance in the lone star tick (acarina: ixodidae): the effects of relative humidity and temperature on weight changes and total water content. 19715160247
pheromone-induced aggregation of ixodid ticks before host contact.the presence of a pre-feeding aggregation pheromone was demonstrated in the species dermacentor variabilis, dermacentor andersoni, dermacentor parumapertus, amblyomma americanum and haemaphysalis leporispalustris by assay within a petri dish. however, amblyomma maculatum and amblyomma cajennense did not aggregate in the sector containing discs of presumed pheromone within the hour period. d. andersoni and a. americanum recognized each other's pheromone and a. americanum recognized that of h. lep ...19836683667
lone star tick sighted in newport county. 19836578558
effect of host age on the expression of acquired resistance to ticks.young guinea-pigs (350 g) expressed significantly greater levels of acquired resistance to challenge by larval amblyomma americanum ticks than older guinea-pigs (520-800 g). this finding suggests that younger guinea-pigs are immunologically more responsive to tick infestation than older mature individuals. therefore, host age is an important variable in evaluating acquired resistance to ticks.19846698176
amblyomma americanum: a potential vector of lyme disease in new jersey.amblyomma americanum is a likely secondary vector of lyme disease in new jersey. ticks of this species were removed from the site of the characteristic skin lesion known as erythema chronicum migrans on two patients with the disease, and the lyme disease spirochete was isolated from nymphs and adults of this species. that a. americanum is a potential vector is supported by its similarities to ixodes dammini, the known tick vector, in seasonal distribution and host utilization. the extensive rang ...19846710158
strategic treatment of pastured beef cattle with acaricides: effect on populations of the lone star tick (acari: ixodidae). 19836826885
fine structure of tarsal sensilla in the tick amblyomma americanum (l.). 19715541841
ecology of tick vectors of american spotted fever.the author reviews the natural history of the tick vectors of american spotted fever. the discussion concerns the ecology of the rocky mountain wood tick, dermacentor andersoni, the american dog tick, dermacentor variabilis, and the lone-star tick, amblyomma americanum, all of which are proven vectors of rocky mountain spotted fever to man. also included are the rabbit tick, haemaphysalis leporispalustris and dermacentor parumapertus, which very rarely bite man but which are considered of import ...19695306621
environmental alteration in recreational areas by mechanical and chemical treatment as a means of lone star tick control. 19705441234
metazoan parasites of the eastern cottontail rabbit in western kentucky.forty-five eastern cottontail rabbits (sylvilagus floridanus allen), collected over a 15 mo period from two areas of western kentucky, were examined for disease conditions, helminth and arthropod parasites. a single lymphosarcoma, two cutaneous papillomas and the following parasites were identified: hasstilesia tricolor, taenia pisiformis, cittotaenia variabilis, raillietina stilesiella, obeliscoides cuniculi, trichuris leporis, longistriata noviberiae, trichostrongylus calcaratus, dermatoxys ve ...19836842731
pressurized sprays of permethrin and deet on clothing for personal protection against the lone star tick and the american dog tick (acari: ixodidae). 19836875081
systematic efficacy of ivermectin mk-933 against the lone star tick. 19826896882
protein changes in the salivary glands of the female lone star tick, amblyomma americanum, during feeding. 19827077436
blood eosinophil and basophil responses in guinea pigs parasitized by amblyomma americanum ticks.guinea pigs sensitized to tick feeding by a previous infestation express immune resistance when challenged. this state is associated with large accumulations of eosinophils, and especially of basophils, at cutaneous sites of tick feeding. the present study shows that primary and secondary tick feeding stimulate blood eosinophilia and basophilia that reflect the infiltration of these cells in the skin. primary feeding of amblyomma americanum larvae resulted in a mean tick yield of 81%, mean tick ...19827081550
ablation of immunity to amblyomma americanum by anti-basophil serum: cooperation between basophils and eosinophils in expression of immunity to ectoparasites (ticks) in guinea pigs.basophils infiltrate the skin and other tissues as part of t lymphocyte and/or antibody-mediated immune responses to certain protein antigens, viruses, tumors, and parasites. although basophils may comprise a significant fraction of leukocytes in these reactions, their precise role has been poorly understood. guinea pigs expressing acquired immunity to the tick amblyomma americanum develop basophil- and eosinophil-rich cutaneous inflammatory responses at tick feeding sites, and tick rejection is ...19827086142
bovine resistance to amblyomma americanum ticks: an acquired immune response characterized by cutaneous basophil infiltrates.purebred holstein calves acquired resistance to amblyomma americanum adult ticks after 1 infestation and expressed resistance during a challenge infestation 26 days later. tick yields from resistant animals were normal, but mean tick weight and egg-mass weight were reduced significantly (31 and 32%, respectively). cutaneous cellular responses at tick feeding sites in primary (naive) hosts consisted almost exclusively of mononuclear cells, until 24-h post-infestation when granulocytes appeared. a ...19846543047
comparison of habitat modification, animal control, and standard spraying for control of the lone star tick. 19827142558
immune serum transfer of cutaneous basophil-associated resistance to ticks: mediation by 7sigg1 antibodies.guinea pigs acquired resistance to amblyomma americanum larval ticks after one infestation, resulting in 46% tick rejection when challenged. intravenous transfer of immune serum from twice-infested hosts to naive animals conferred a significant level of immunity resulting in 18 to 30% tick rejection. the minimum effective dose of serum was 3 ml per recipient, and heating the serum at 56 degrees c for 4 hr had no effect on serum activity. fractionation of whole immune serum by gel filtration chro ...19827142697
pressurized sprays of permethrin on clothing for personal protection against the lone star tick (acari: ixodidae). 19827161438
success of tick feeding on calves immunized with amblyomma americanum (acari: ixodidae) extract. 19817265136
response of hypersensitized guinea pigs to the feeding of amblyomma americanum ticks.guinea pigs acquired resistance to the feeding of immature amblyomma americanum ticks after a single infestation. the initial larval and nymphal feedings resulted in cumulative mortalities of 27.2 and 28.9%, respectively. the second and third larval infestations yielded cumulative mortalities of 50.5 and 52.4%, compared to 18.9 and 24.4% cumulative mortality from controls. second and third nymphal feedings resulted in 75.7 and 73.4%, and ticks from controls exhibited 36.6 and 34.7% cumulative mo ...19817267146
adenosine-3',5'-monophosphate in salivary glands of unfed and feeding female lone star ticks, amblyomma americanum (l.).basal levels of camp in salivary glands of female lone star ticks were found to be about 5 pmoles/mg protein during all stages of feeding. glands stimulated with 10(-5)m dopamine and 10(-5)m dopamine plus theophylline exhibited significant increases in camp/mg protein. after stimulation by 10(-5)m dopamine was removed, camp decreased faster in glands from slowly feeding ticks (less than 200 mg) than in glands of rapidly feeding ticks (greater than 200 mg).19846149877
effect of age on the attachment rate of the parasitic stages of the lone star tick, amblyomma americanum (linnaeus) (acarina: ixodidae), in the laboratory. 19705435814
cutaneous basophil responses and immune resistance of guinea pigs to ticks: passive transfer with peritoneal exudate cells or serum.resistance to infestation by larval amblyomma americanum or rhipicephalus sanguineus ticks was transferred to naive guinea pigs with peritoneal exudate cells (pec) or serum from donors immunized by prior infestation with homologous tick larvae. in the a. americanum system, pec transfer induced 87% tick rejection, which was similar to the level of resistance in actively sensitized hosts. in the r. sanguineus system, pec conferred resistance (39% rejection) that was weaker than in actively sensiti ...19817299125
human 'seed tick' infestation. amblyomma americanum larvae. 19817316562
ixodid ticks on feral swine in florida.more than 99% of the 645 feral swine (sus scrofa l.) in southern florida harbored ixodid ticks. dermacentor variabilis (american dog tick) was present on 99.6% of the swine and comprised 82.5% of the ticks collected. amblyomma maculatum (gulf coast tick) occurred on 85.9% of the hosts and 17.4% of the collections were of this species. amblyomma americanum (lone star tick) and ixodes scapularis (black-legged tick) were found infrequently and together constituted less than 0.1% of the ticks. pigs ...19846737605
control of the lone star tick in oklahoma parks through vegetative management. 19817320314
acaricide susceptibility in the lone star tick: assay techniques and baseline data. 19817320318
alveolar structure of salivary glands of the lone star tick, amblyomma americanum (l.): unfed females.alveoli in the salivary glands of unfed amblyomma americanum (l.) females (postnymphal ticks that had not yet taken a bloodmeal as an adult) were studied. as in other species of female ixodid ticks, the salivary glands consisted of three alveoli, one agranular and two granular. the agranular alveoli were directly attached to the anterior portion of the main salivary duct, consisted of approximately 13 to 14 cells, and were without valves. six peripheral cells had tortuous, plasma membrane infold ...19827200514
antibodies to spotted fever-group rickettsiae in dogs and prevalence of infected ticks in southern connecticut.blood samples and ticks were obtained from dogs to assess canine exposure to spotted fever-group (sfg) rickettsiae during 1978-1980 in southern connecticut. of the 1,576 dog sera screened by microimmunofluorescence. 174 (11.0%) contained specific antibodies at titers greater than or equal to 1:64 against rickettsia montana (n = 34), r rickettsii (n = 31), r rhipicephali (n = 19), or the unclassified 369-c rickettsia (n = 90). end points greater than or equal to 1:8,192 to r rickettsii and to r r ...19826803626
fecundity and development of the lone star tick on woodlot-pastured braford and hereford heifers. 19807430489
suitability of birds and mammals as hosts for immature stages of the lone star tick, amblyomma americanum (acari: ixodidae). 19817288841
experimental transmission of african swine fever virus by ornithodoros coriaceus, an argasid tick indigenous to the united states.three ticks, indigenous to the united states, were assessed for their ability to maintain and transmit african swine fever virus (asfv). amblyomma americanum and a cajennense adults and nymphs maintained virus for 4 to 7 days after engorging on infected swine blood; however, virus was not carried through the subsequent molt of nymphs and it was not transmitted vertically to the eggs and larvae of the infected females. on refeeding of the ticks, infection was not transmitted to healthy swine. orn ...19807406278
regulation of feeding and ovipositional success of amblyomma americanum ticks. 19827128750
activity of repellents applied to skin for protection against amblyomma americanum and ixodes scapularis ticks (acari: ixodidae).twenty-nine repellents were tested on human skin for duration of activity as protectants against nymphal lone star ticks (amblyomma americanum) and against black-legged or deer ticks (ixodes scapularis say). eleven of these repellents, including deet, provided > 2 h of protection against the lone star tick. one repellent, 1-(3-cyclohexenyl-ylcarbonyl) piperidine, was effective > or = 4 h. four repellents (2 pyridines and 2 piperidines with protection lasting 2.3-3 h) showed acaricidal activity t ...19957616181
experimental transmission of ehrlichia chaffeensis (rickettsiales: ehrlichieae) among white-tailed deer by amblyomma americanum (acari: ixodidae).ehrlichia chaffeensis anderson, dawson & wilson, causative agent of human (predominantly monocytic) ehrlichiosis, was successfully transmitted experimentally by amblyomma americanum (l.) to white-tailed deer, odocoileus virginianus (zimmerman). deer were needle-exposed intravenously to e. chaffeensis in tissue-culture canine macrophage (dh82) cells, and 11 d later were exposed to laboratory-reared a. americanum larvae, nymphs, and adults for acquisition feeding. three months after this feeding, ...19957616529
biosynthesis of salivary prostaglandins in the lone star tick, amblyomma americanum.dopamine-induced saliva from ticks fed [3h]arachidonic acid contained the radiolabelled prostaglandins e2, f2 alpha, d2, and b2, the latter probably derived from pge2 owing to the alkalinity of tick saliva. prostaglandin synthetase (pgs) activity in the salivary gland homogenate from the lone star tick, amblyomma americanum, could not be detected by standard radiometric methodologies successfully employed for tissues from many animal species, including numerous arthropods. modifications to the a ...19957627205
ectoparasites collected from bobwhite quail in the southeastern united states.twenty-one species of ectoparasites representing 19 genera were collected from 481 bobwhite quail (colinus virginianus) from nine areas in four southeastern states. sixteen species, amblyomma americanum, haemaphysalis chordeilis, haemaphysalis leporispalustris, eutrombicula alfreddugesi alfreddugesi, neoschoengastia americana, boydaia colini, pterolichus sp., colinophilus wilsoni, megninia sp., apionacarus wilsoni, colinoptes cubanensis, menacanthus pricei, colinicola numidiana, gonoides ortygis ...19807463603
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