| ontogeny of homeothermy in microtus pennsylvanicus and octodon degus. | | 1975 | 1195 |
| sewage sludge as a source of cadmium in soil-plant-animal systems. | the objective of this presentation is to relate the abundance and mobility of cd in components of terrestrial ecosystems with implications for land utilization of sewage sludge. the uptake of cd by crop plants is a function of the quantity of the element in the soil plus other soil factors affecting the cd ion activity or electrochemical potential at the plant root surface. the natural abundance of cd in soils has been reported as 0.5 mug/g which is higher than the background level of 0.2 mug/g ... | 1979 | 39747 |
| ixodes ricinus: vector of a hitherto undescribed spotted fever group agent in switzerland. | a tick/rickettsial survey in various parts of switzerland revealed the presence of a new, hitherto undescribed spotted fever group rickettsia ("swiss agent") in up to 11.7% of i. ricinus collected off vegetation. infection in ticks was found to be generalized with rickettsiae developing intracellularly and occasionally also intranuclearly. as a result of massive growth in ovarial tissues, including the germinative cells, the rate of transovarial and filial infection was 100%. the "swiss agent" a ... | 1979 | 44100 |
| isolation of spotted fever group and wolbachia-like agents from field-collected materials by means of plaque formation in mammalian and mosquito cells. | three isolations from ticks (dermacentor occidentalis) of a rickettsia of the spotted fever group and 5 isolations from chipmunk (eutamias rugicaudus) blood of a wolbachia-like agent were obtained from plaques formed in singh's aedes albopictus (mosquito) and vero (african green monkey kidney) cell cultures. these organisms could not be isolated by injection of the infected ticks or blood into embryonated chicken eggs, guinea pigs, or voles (microtus pennsylvanicus), but fluid cultures of grace' ... | 1975 | 241251 |
| evidence of pregnancy failure in the wild meadow vole, microtus pennsylvanicus. | | 1977 | 319881 |
| new microbial growth factor. | a screening procedure was used to isolate from soil a penicillium sp., two bacterial isolates, and a streptomyces sp. that produced a new microbial growth factor. this factor was an absolute growth requirement for three soil bacteria. the penicillium sp. and one of the bacteria requiring the factor, an arthrobacter sp., were selected for more extensive study concerning the production and characteristics of the growth factor. it did not seem to be related to the siderochromes. it was not present ... | 1977 | 327929 |
| the meadow vole (microtus pennsylv anicus) as a laboratory animal. | | 1977 | 333179 |
| reproduction in the island beach vole, microtus breweri, and the mainland meadow vole, microtus pennsylvanicus, in southeastern massachusetts. | | 1977 | 336824 |
| seasonal variation in adrenal 11beta-hydroxysteroid dehydrogenase activity in the meadow vole (microtus pennsylvanicus). | | 1978 | 365676 |
| effects of duration of daily illumination on reproductive organs and fertility of the meadow vole (microtus pennsylvanicus). | the objective of this study was to determine the optimum simple, constant photoperiod for voles in a laboratory colony. voles from an established colony maintained at 22 degrees c with a photoperiod of 14:10 hours of light:dark were transferred at 50 days of age to a photoperiod of 12:12, 14:10, 16:8 or 18:6 hours of light:dark. from day 96 to day 102, the 9--10 females per treatment group were paired with a male. body and gonadal weights, spermatogenesis, ovarian activity and pregnancy were eva ... | 1979 | 379433 |
| growth of clethrionomys gapperi and microtus pennsylvanicus in captivity. | growth of clethrionomys gapperi and microtus pennsylvanicus from southern manitoba was documented from birth to 30 days. clethrionomys gapperi were smaller and grew more slowly (g/day) than m. pennsylvanicus, although both species were weaned at the same age. there were significant differences in growth rates between sexes in m. pennsylvanicus and among litter sizes in both species. most of the variability in growth was due to differences among litters. the patterns of development was similar to ... | 1979 | 389747 |
| intraerythrocytic parasites in rodent populations of connecticut: babesia and grahamella species. | a total of 612 peromyscus leucopus, 11 microtus pennsylvanicus, 21 clethrionomys gapperi, and 4 tamias striatus was collected in connecticut and examined for babesia and grahamella during 1976 and 1977. babesia antibodies were detected in sera of 9 p. leucopus collected from 4 sites. babesia parasites were not detected in the blood smears of captured rodents. subsequent splenectomy and subinoculation of blood from these rodents into susceptible animals failed to induce disease and no babesia was ... | 1979 | 512755 |
| the prevalence of serum antibodies to toxoplasma gondii in ontario mammals. | the prevalence of seropositive reactions to toxoplasma gondii was studied in farm animals, companion animals, wild rodents and birds. of the animals tested, 17% of cattle, 65% of sheep, 45% of pigs, 9% of horses, 33% of dogs and 20% of cats were seropositive by the sabin-feldman dye test. in addition 11% of mice (mus musculus), 5% of deer mice (peromyscus), 3% of rats (rattus norvegicus) and less than 2% of sparrows (passer domestcus) were seropositive. all samples from short-tailed field mice ( ... | 1978 | 667705 |
| human babesiosis: reservoir in infection on nantucket island. | examination of blood films from six species of rodents and lagomorphs on nantucket island disclosed infections with babesia microti in all of five microtus pennsylvanicus (field mice) and 31 of 39 peromyscus leucopus (white-footed or deer mice). six human cases of clinical babesiosis have recently been diagnosed on the island. | 1976 | 769166 |
| breeding and reproduction of fifteen wild rodents maintained as laboratory colonies. | data on reproduction and production were presented for laboratory colonies of microtus pennsylvanicus tananaensis, m oeconomus macfarlani, m o operarius, m mirurus, m abbreviatus, lemmus lemmus, l sibiricus trimucronatus, dicrostonyx stevensoni, clethrionomys rutilus, peromyscus maniculatus borealis, p m bairdii, baiomys taylori, calomys ducilla, c callosus, acomys cahirinus. litter size varied from 2.0 in a cahirinus to 5.5 in c callosus. infant (neonatal) and juvenile losses through the end of ... | 1976 | 775192 |
| diet feeders for weanling meadow voles (microtus pennsylvanicus). | | 1976 | 781400 |
| the meadow vole as an experimental animal. | a meadow vole colony has been in operation at the pennsylvania state university for 6 yr. the breeding colony consists of 16 breeding harems of 1 male and 2-4 females per cage. over 2,500 weanlings have been available each year for various experiments. primary emphasis has been directed toward determination of the weanling's nutritional requirements. adults have been used to study plant factors associated with the palatability of forages. this information has been used to devise specific bioassa ... | 1976 | 787673 |
| rhipicephalus sanguineus: vector of a new spotted fever group rickettsia in the united states. | a rickettsia related to but distinct from the spotted fever agent, rickettsia rickettsii, has been detected in 167 (18.9%) of 884 rhipicephalus sanguineus taken off dogs in central and northern mississippi. the organisms could readily be isolated in male meadow voles (microtus pennsylvanicus), where it produced massive infections in the tissues of tunica vaginalis. it was practically nonpathogenic for male guinea pigs, although inoculation of these animals with infected tunica vaginalis of voles ... | 1975 | 806533 |
| consummatory behavior in meadow voles (microtus pennsylvanicus) and mongolian gerbils (meriones unguiculatus). | consumption of water and adulterated fluids was measured under choice and no choice situation in voles and gerbils. voles consumed more water throughout, and were clearly less able to tolerate challenges presented by adulteration of available solutions in the no choice situation. intake of both species under choice conditions was more affected (although differentially) by fluid adulteration that it had been when no choice was available. male and female differences were noted but typically these ... | 1975 | 1103172 |
| comparison of yearly prevalences of echinococcus multilocularis leuckart 1863 in peromyscus maniculatus and microtus pennsylvanicus in north dakota. | | 1975 | 1104799 |
| flea reinfestation on the california meadow vole (microtus californicus). | | 1975 | 1123837 |
| hemoglobin polymorphism in microtus pennsylvanicus. | | 1976 | 1277810 |
| three patterns of mitochondrial dna nucleotide divergence in the meadow vole, microtus pennsylvanicus. | the dna sequence was determined for the cytochrome c oxidase ii (coii), trnalys, and atpase 8 genes from the mitochondrial genome of the meadow vole, microtus pennsylvanicus. when compared to other rodents, three different patterns of evolutionary divergence were found. nucleotide variation in trnalys is concentrated in the t psi c loop. nucleotide variation in the coii gene in three genera of rodents (microtus, mus, rattus) consists predominantly of transitions in the third base positions of co ... | 1992 | 1313508 |
| oxytocin receptor distribution reflects social organization in monogamous and polygamous voles. | the neuropeptide oxytocin has been implicated in the mediation of several forms of affiliative behavior including parental care, grooming, and sex behavior. here we demonstrate that species from the genus microtus (voles) selected for differences in social affiliation show contrasting patterns of oxytocin receptor expression in brain. by in vitro receptor autoradiography with an iodinated oxytocin analogue, specific binding to brain oxytocin receptors was observed in both the monogamous prairie ... | 1992 | 1321430 |
| [serological study of the incidence of murine viruses in a population of small wild rodents (microtus pennsylvanicus ord, 1815)]. | the results of a serological survey of a free-living population of meadow voles (microtus pennsylvanicus) in pinawa, manitoba (canada) showed that these animals possessed antibodies to six of the eleven viruses tested for, namely: reovirus type 3, murine encephalomyelitis agent, ectromelia virus, murine adenovirus, murine hepatitis virus and lymphocytic choriomeningitis virus. the significant increase in the number of individuals possessing specific antibodies suggests that these viruses, or rel ... | 1992 | 1339064 |
| influence of gonadal hormones on odours emitted by male meadow voles (microtus pennsylvanicus). | free-living male meadow voles (microtus pennsylvanicus) emit odours that are attractive to females at the beginning, but not at the end, of the breeding season. the effect of gonadal hormones on female-attractant cues was examined in males born and reared in long (14 h light day-1) and short (10 h light day-1) photoperiods that simulate daylengths in the breeding and nonbreeding seasons, respectively. gonadectomy affected the attractant properties of odours emitted by long photoperiod, but not s ... | 1992 | 1404090 |
| parasitic arthropods of sympatric meadow voles and white-footed mice at fort detrick, maryland. | twelve species of parasitic arthropods (one sucking louse, two fleas, one tick, and eight mites) were recovered from 51 meadow voles, microtus pennsylvanicus (ord); whereas nine species (one sucking louse, one bot, three fleas, one tick, and three mites) were collected from 48 white-footed mice, peromyscus leucopus (rafinesque), live-trapped on the grounds of fort detrick, frederick county, md., during 1990 and 1991. the most commonly collected arthropods from m. pennsylvanicus were the fur mite ... | 1992 | 1404254 |
| time course of androgenic modulation of odor preferences and odor cues in male meadow voles, microtus pennsylvanicus. | during the breeding season, male meadow voles prefer female over male odors and females prefer male over female odors. testosterone control of males' odor preferences and production of odors attractive to females differ. a male meadow vole's preference for female versus male odor was still evident 1 week after castration, but not 1 week later. this preference was reinstated in testosterone-treated male voles 2 weeks after the onset of hormone replacement. the attractiveness of male odors to fema ... | 1992 | 1478635 |
| sodium arsanilate-induced vestibular dysfunction in meadow voles (microtus pennsylvanicus): effects on posture, spontaneous locomotor activity and swimming behavior. | vestibular dysfunction was chemically induced in male meadow voles (microtus pennsylvanicus) by intratympanic injections (30 mg per side) of sodium arsanilate (atoxyl). the control group received intratympanic injections of isotonic saline. after a one-week recovery period the voles were behaviorally assayed for integrity of their labyrinthine systems. all subjects were tested for the presence of the air-righting reflex and body rotation-induced nystagmus. three weeks later a multivariate assess ... | 1992 | 1571099 |
| photoperiod and gonadal hormones influence odor preferences of the male meadow vole, microtus pennsylvanicus. | male meadow voles housed in a long photoperiod (14 h light/day, lp) preferred female to male odors, whereas males maintained in a short photoperiod (10 h light/day, sp) did not display preferences for odors of either sex. these odor-preference patterns matched those of free-living males during spring and autumn, respectively. the preference of lp male voles for female over male odors was eliminated by gonadectomy and reinstated by treatment with testosterone. in sp males, although gonadectomy di ... | 1992 | 1615048 |
| the effects of mate removal on pregnancy success in prairie voles (microtus ochrogaster) and meadow voles (microtus pennsylvanicus). | the effects of removing the stud male have not been controlled in many studies relating pregnancy block to the presence of an unfamiliar male. we examined the effects of removing the male on pregnancy success in prairie voles and meadow voles, two species that differ in degree of paternal investment. whereas prairie vole males provide extensive care to offspring and accelerate pup development, meadow vole males display little or no care and delay development of pups. we predicted that removal of ... | 1992 | 1637945 |
| ovarian hormones influence odor cues emitted by female meadow voles, microtus pennsylvanicus. | during the spring-summer breeding season female meadow voles emit odors that are preferred by males, whereas in the autumn-winter season of reproductive quiescence females emit odors that are not preferred by males, but are attractive to females. the effects of daylength and ovarian hormones on salience of female odors were determined by assaying male responses to odors. females housed in long and short photoperiods transmitted odors that elicited responses similar to those of spring and autumn ... | 1991 | 1813382 |
| splenomegaly and reticulocytosis caused by babesia microti infections in natural populations of the montane vole, microtus montanus. | a survey for babesia microti in rodents was conducted at six sites within grand teton national park, wyoming. blood and spleen smears, hematocrits, and reticulocyte counts were made on all of the animals to evaluate parameters for the diagnosis of babesiosis. ticks were removed for identification. of 257 microtus montanus, 103 were infected with b. microti. in addition, five of 12 microtus pennsylvanicus and one of three arvicola richardsoni were parasitized by b. microti. peromyscus maniculatus ... | 1991 | 1818201 |
| seasonal control of odour preferences of meadow voles (microtus pennsylvanicus) by photoperiod and ovarian hormones. | during the spring-summer breeding season, female meadow voles prefer odours of males over those of females, but in the autumn-winter season of reproductive quiescence this preference is reversed. females housed in long (14 h light/day) and short (10 h light/day) photoperiods, respectively, had odour preferences comparable to those of spring and autumn voles, respectively. the preference of long-photoperiod voles for male over female odours was reversed by ovariectomy and restored by treatment wi ... | 1991 | 1886099 |
| hantavirus infection in the united states: epizootiology and epidemiology. | multiple species of murid and arvicolid (microtine) rodents serve as the reservoir hosts of hantaviruses, the etiologic agents of hemorrhagic fever with renal syndrome. three antigenically distinct hantaviruses have been isolated from rattus norvegicus, mus musculus, and microtus pennsylvanicus captured in the united states, and serologic evidence of a hantavirus enzootic has been found in several other indigenous rodent species. in residential districts of port cities such as baltimore, nearly ... | 1990 | 1972804 |
| small mammals as monitors of environmental contaminants. | the merit of using small mammals as monitors of environmental contaminants was assessed using data from the published literature. information was located on 35 species of small mammals from 7 families used to monitor heavy metals, radionuclides, and organic chemicals at mine sites, industrial areas, hazardous and radioactive waste disposal sites, and agricultural and forested land. to document foodchain transfer of chemicals, concentrations in soil, vegetation, and invertebrates, where available ... | 1991 | 1992495 |
| survey for ixodes spp. and borrelia burgdorferi in southeastern wisconsin and northeastern illinois. | forested areas adjacent to milwaukee, wis., and chicago, ill., were investigated for rodents and ticks infected with borrelia burgdorferi, the causative agent of lyme disease. white-footed mice (peromyscus leucopus or peromyscus maniculatus), meadow voles (microtus pennsylvanicus), and eastern chipmunks (tamias striatus) were captured; and specimens from these animals were cultured for b. burgdorferi to define whether the midwestern lyme disease area currently encompasses these large metropolita ... | 1991 | 2007650 |
| prolactin counteracts effects of short day lengths on pelage growth in the meadow vole, microtus pennsylvanicus. | to test whether growth of the winter coat in short day lengths is contingent on suppression of plasma prolactin (prl) levels, female meadow voles (microtus pennsylvanicus) were kept in short day lengths for 12 weeks and were injected daily with saline or prl; long-day animals were treated with either the dopamine agonist, bromocryptine (bromo), bromo plus prl, or saline. prl treatment prevented the growth of the winter coat normally observed after 12 weeks in short day lengths, but bromocryptine ... | 1990 | 2179462 |
| patterns of sperm allocation across successive ejaculates in four species of voles (microtus). | this study was designed to determine testes masses, total number of spermatozoa ejaculated per copulatory episode, and the pattern of sperm numbers in successive ejaculates in prairie voles (microtus ochrogaster), montane voles (m. montanus), pine voles (m. pinetorum), and meadow voles (m. pennsylvanicus). prairie voles displayed mean totals of 2.7 ejaculations and 30.5 x 10(6) spermatozoa before reaching a satiety criterion; montane voles 3.4 ejaculations and 19.0 x 10(6) spermatozoa, pine vole ... | 1990 | 2179544 |
| postimplantation pregnancy disruptions in meadow voles: relationship to variation in male sexual and aggressive behavior. | previous research on microtines indicates that the presence of new males may more effectively produce pregnancy disruptions than do pheromones alone. if the male's presence is important, behavioral differences among males may be related to the occurrence of disruptions. we observed female meadow voles (microtus pennsylvanicus) interacting with new males twelve days after they had been paired with stud males. behavioral interactions were recorded for one hour on each of days 12-14. timing of part ... | 1990 | 2183249 |
| evolution of spatial cognition: sex-specific patterns of spatial behavior predict hippocampal size. | in a study of two congeneric rodent species, sex differences in hippocampal size were predicted by sex-specific patterns of spatial cognition. hippocampal size is known to correlate positively with maze performance in laboratory mouse strains and with selective pressure for spatial memory among passerine bird species. in polygamous vole species (rodentia: microtus), males range more widely than females in the field and perform better on laboratory measures of spatial ability; both of these diffe ... | 1990 | 2201026 |
| vaccinia recombinant virus expressing the rabies virus glycoprotein: safety and efficacy trials in canadian wildlife. | twenty-six meadow voles (microtus pennsylvanicus), ten woodchucks (marmota monax), thirteen grey squirrels (sciurus carolinensis), thirteen ring-billed gulls (larus delawarensis), six red-tailed hawks (buteo jamaicensis) and eight great horned owls (bubo virginianus) received vaccinia virus recombinant expressing the rabies virus glycoprotein (v-rg) by direct instillation into the oral cavity. each of ten coyotes (canis latrans) received the virus in two vaccine-laden baits. several voles and mo ... | 1990 | 2249183 |
| neurochemical changes in experimental african trypanosomiasis in voles and mice. | dopamine, norepinephrine, serotonin and related metabolites were measured in the brain of meadow voles and mice after infection with trypanosoma brucei gambiense with the goal of understanding the neurochemical changes accompanying infection with this parasite. serotonin and 5-hiaa levels both fell by 26%, and hva levels rose by 56%, in vole brains during infection. dopamine, dhpg and norepinephrine levels, however, remained unchanged. in mice, serotonin levels dropped by 17 and 23%, respectivel ... | 1987 | 2460039 |
| serologic evidence of hantaviral infections within small mammal communities of baltimore, maryland: spatial and temporal patterns and host range. | serologic evidence was used to investigate the spatial and temporal distribution and host range of hantaviruses in small mammal communities in baltimore, md. immunofluorescent antibody (ifa) reactive to a baltimore rat isolate of seoul virus was detected in 44% of 404 norway rats captured at 4 park or residential locations; 21% of 121 meadow voles captured at 4 park locations possessed significant ifa titers to prospect hill virus. evidence from plaque neutralization assay of rodent sera suggest ... | 1989 | 2570533 |
| differential inhibitory effects of mif-1, tyr-mif-1, naloxone and beta-funaltrexamine on body rotation-induced analgesia in the meadow vole, microtus pennsylvanicus. | the effects of body rotation in a horizontal plane and various opiate antagonists on the nociceptive responses of a day-active microtine rodent, the meadow vole, microtus pennsylvanicus, were examined. intermittent rotation (70 rpm, schedule of 30 sec on, 30 sec off) for 30 min induced significant analgesic responses in the voles for 15 min after rotation. these increases in thermal response latency were blocked by intraperitoneal pretreatment with either naloxone or the irreversible mu opiate r ... | 1989 | 2571138 |
| the influence of multiple photoperiods and pinealectomy on gonads, pelage and body weight in male meadow voles, microtus pennsylvanicus. | 1. chronic exposure of male microtus pennsylvanicus to photoperiods with 8, 10 and 12 hr of light per day results in gonadal regression, molt to winter pelage and significant reductions in body weight and food consumption relative to voles kept on photoperiods with 13 and 14 hr of light per day. 2. a precise critical daylength is observed in this species as exposure to photoperiods with 12 or fewer hours of light per day results in complete gonadal involution, seasonal molt and loss of body weig ... | 1989 | 2573458 |
| anemia at the onset of winter in the meadow vole (microtus pennsylvanicus). | 1. from 1981 to 1986, 6120 meadow voles (microtus pennsylvanicus) were sampled for hematological indices in southeastern manitoba, canada. this survey revealed the sporadic occurrence of anemia in early winter at mean temperatures below about -5 degrees c. 2. anemia was associated with leukocytosis and circulating normoblasts, suggesting a sudden, large blood loss. individuals became anemic quickly, with no obvious predisposing factors. 3. attempts were made to induce anemia by exposing voles in ... | 1989 | 2573475 |
| maternal melatonin treatment influences rates of neonatal development of meadow vole pups. | meadow vole dams, housed in a 14l:10d photoperiod were injected daily 3 h before onset of darkness with 10 micrograms melatonin. treatment during gestation or lactation produced offspring that exhibited altered somatic, testicular, and pelage growth. gestational melatonin treatment decreased preweaning weight gain, delayed testicular development, and increased pelage growth in offspring, whereas melatonin treatment during lactation increased pelage depth at weaning and increased post-weaning som ... | 1989 | 2667649 |
| age, photoperiodic responses, and pineal function in meadow voles, microtus pennsylvanicus. | we tested whether juvenile males of microtus pennsylvanicus were more sensitive than adults to the suppressive effects of short photoperiods. voles were transferred to short photoperiods (10l:14d) at 20 or 80 d of age, and 60 d later (i.e. at 80 or 140 d) the animals were killed at intervals throughout the day and night. pineal glands were collected for measurement of melatonin, and the testes were weighed. there were no differences in paired testicular weights of 80 and 140 d old animals held o ... | 1989 | 2681679 |
| differential distribution of immature ixodes dammini (acari: ixodidae) on rodent hosts. | ectoparasites such as ixodid ticks that remain attached to hosts for several days while feeding on blood are able to overcome the inflammatory and immune responses of some hosts and not others. the immature stages of the deer tick ixodes dammini are found more frequently on the white-footed mouse, peromyscus leucopus, than on other rodents. we propose that p. leucopus is more tolerant to i. dammini than is a less common host, the meadow vole, microtus pennsylvanicus. to test this hypothesis, the ... | 1989 | 2693676 |
| epidemiology of potomac horse fever: an investigation into the possible role of non-equine mammals. | a serological study of antibodies to ehrlichia risticii was carried out on 10 species of wild and domestic mammals found on or near 21 horse farms in an area of the usa in which potomac horse fever is endemic. no antibodies were found in 133 peridomestic rodents (norway rats and house mice), nor in 108 wild rodents (white-footed mice and meadow voles) captured on farms. three of the six domestic animal species examined, cats, pigs and a goat, showed serological evidence of exposure to e risticii ... | 1989 | 2773237 |
| comparing the relative potential of rodents as reservoirs of the lyme disease spirochete (borrelia burgdorferi). | the authors compared the contribution of white-footed mice (peromyscus leucopus), chipmunks (tamias striatus), and meadow voles (microtus pennsylvanicus) to infection of vector ticks with the lyme disease spirochete, borrelia burgddorferi. at one massachusetts location where lyme disease is endemic, all three species of rodents were found to be infected. prevalence of infection, however, varied from 90% for mice, and 75% for chipmunks to just 5.5% for meadow voles. infectivity of these hosts for ... | 1989 | 2787105 |
| prospective seroepidemiology of hantaviruses and population dynamics of small mammal communities of baltimore, maryland. | we used a prospective seroepidemiological study, in conjunction with a mark-release-recapture protocol, to investigate the transmission of hantaviruses in four rodent species from baltimore, maryland, from june 1984 to june 1986. a total of 1,208 captures of 762 rodents provided 984 individual blood samples. the antibody prevalence, as determined by frequency of reciprocal indirect fluorescent antibody (ifa) titers greater than or equal to 32, was 33.9% in rats (rattus norvegicus, n = 466), 28.3 ... | 1987 | 2891308 |
| serological survey of prospect hill virus infection in indigenous wild rodents in the usa. | we found serological evidence of infection with prospect hill virus, a hantaan-like virus isolated from meadow voles (microtus pennsylvanicus), in microtine and cricetid rodents trapped in maryland, west virginia, minnesota and california, usa. fluorescent antibodies were detected in sera from m. pennsylvanicus (74/277), m. californicus (39/185), clethrionomys gapperi (5/51), peromyscus maniculatus (4/22) and p. truei (1/11). sera from seropositive p. maniculatus contained neutralizing antibodie ... | 1987 | 2895510 |
| hormonal regulation of preputial gland function in male microtus montanus, the montane vole. | 1. preputial gland function in male microtus montanus is androgen-dependent, both in terms of preputial weights and in the production of a series of lipids which are present in m. montanus and absent from microtus pennsylvanicus. 2. production of these species-typical lipids is decreased but not eliminated in castrates, as well as in adrenalectomized castrates treated with corticosterone. therefore, in the total absence of androgens, a low level of these lipids is still produced. 3. 5 alpha-dihy ... | 1988 | 2900102 |
| the effects of fasting on some physiological parameters in the meadow vole, microtus pennsylvanicus. | 1. the effect of fasting on respiratory quotient (rq), metabolic rate, blood glucose, liver glycogen, carcass lipids, interscapular brown adipose tissue (ibat), and body temperature was investigated in microtus pennsylvanicus. 2. the utilization of carbohydrates during fasting leads to a severe hypoglycemia within 6 hr. 3. the hypoglycemia does not seem to stem from the inability to mobilize glycogen or fat reserves. 4. the hypoglycemic state may be responsible for the decreased smr and body tem ... | 1988 | 2907429 |
| experimental hantavirus infection in nonhuman primates. | mild, transient proteinuria and azotemia were produced in three cynomolgus monkeys (macaca fascicularis) and a chimpanzee (pan troglodytes) following intravenous inoculation with prospect hill virus, a hantavirus isolated from meadow voles in the united states. this is the first demonstration of an acute nephropathy in nonhuman primates with the viruses causing hemorrhagic fever with renal syndrome. | 1988 | 3137914 |
| effect of orally administered pilocarpine on serum enzymes, organ weights and histopathology in meadow voles. | fifteen mature meadow voles (microtus pennsylvanicus) were assigned to each of four diets: 1) basal; 2) basal + .001% pilocarpine (plcn); 3) basal + .01% plcn; 4) basal + .10% plcn in a completely randomized design to measure the effect of plcn on liver, kidney and parotid gland histopathology and feed intake. meadow voles were fed each treatment for 14 d prior to euthanasia. serum glutamic oxaloacetate transaminase, glutamic pyruvate transaminase and alkaline phosphatase levels were unaffected ... | 1987 | 3312136 |
| influence of daylength experienced by dams on post-natal development of young meadow voles (microtus pennsylvanicus). | meadow voles born to dams kept in short days (sd) beginning 5 or 11 weeks before parturition (sd-5, sd-11) had less developed testes, gained weight more slowly and built larger nests than did young gestated and maintained in long days (ld). pelage development was greater in sd than in ld young at 21 and 45 days of age. at weaning, sd-5 young had less dense fur and shorter guard hairs than did sd-11 young, indicating that the photoperiodic history of dams before insemination affects the post-nata ... | 1987 | 3323493 |
| role of photoperiod during pregnancy and lactation in the meadow vole, microtus pennsylvanicus. | the influence of daylength on body mass and food intake of pregnant and lactating voles was tested by comparing animals housed in long versus short daylengths. pregnancy rates were approximately 50% in long-day females and in voles kept in short days beginning 2 weeks before mating, but were significantly lower in voles preadapted to short days for 8 weeks before mating. body mass and food intake increased substantially during pregnancy and lactation and the magnitude of the increase was unaffec ... | 1987 | 3323494 |
| interaction of daylength and lactation in the control of pelage development and nest-building in female meadow voles (microtus pennsylvanicus). | pregnancy and lactation inhibited moult into winter pelage in voles maintained in short daylengths; development of a winter pelage was, however, greatly accelerated once the short-day dams weaned their litters. the presumed elevation of prolactin titres during lactation appears to mask full development and expression of pelage changes induced by short daylengths. nest-building behaviour, by contrast, was increased in response to short photoperiods and was further augmented during lactation and m ... | 1987 | 3323495 |
| myiasis by wohlfahrtia vigil in nestling microtus pennsylvanicus. | | 1986 | 3332292 |
| excystation and culturing of human and animal giardia spp. by using gerbils and tyi-s-33 medium. | mongolian gerbils were used as an animal model to excyst and host giardia spp. isolated from meadow voles, dogs, beavers, and humans. both cysts and trophozoites were used to establish infections. gerbils were infected with giardia duodenalis from beaver, dog, and human sources, and the trophozoites were extracted and cultured in diamond tyi-s-33 medium. the use of gentamicin and ampicillin in the medium, coupled with treatment of gerbils with gentamicin before they were sacrificed, permitted th ... | 1986 | 3516070 |
| peromyscus leucopus and microtus pennsylvanicus simultaneously infected with borrelia burgdorferi and babesia microti. | borrelia burgdorferi, the etiologic agent of lyme disease, and babesia microti, the causative agent of human babesiosis, were isolated from 71 and 57%, respectively, of 14 specimens of peromyscus leucopus and microtus pennsylvanicus collected from prudence and patience islands, r.i. both pathogens were isolated from five individual rodents. the presence of these two infectious organisms in the same mammal suggests that individual larval ixodes dammini may ingest both pathogens and subsequently t ... | 1986 | 3517038 |
| transfer coefficient of 226ra from vegetation to meadow voles, microtus pennsylvanicus, on u mill tailings. | the 226ra level in vegetation growing on u mine tailings in elliot lake, ontario, canada, was 211 + 22 mbq g-1 (dry weight) compared to less than 7 mbq g-1 (dry weight) in material from a control site. skeletons of meadow voles (microtus pennsylvanicus) established on the tailings had concentrations of 226ra of 6,083 +/- 673 mbq per animal in winter; 7,163 +/- 1,077 mbq per animal in spring; 1,506 +/- 625 mbq per animal in summer; and 703 +/- 59 mbq per animal in fall, compared to less than 7 mb ... | 1986 | 3519533 |
| the absence of an interaction between a microtus pennsylvanicus density cycle and dermacentor variabilis infestation levels. | | 1986 | 3522382 |
| serologic study on the prevalence of murine viruses in a population of wild meadow voles (microtus pennsylvanicus). | the demography and serology of a population of wild meadow voles (microtus pennsylvanicus) were monitored from 1982 to 1984 near pinawa, manitoba, canada. serologic tests were performed on 486 samples to detect the presence of viral antibodies to 11 common murine viruses. meadow voles showed evidence of infection with theiler's encephalomyelitis, reovirus-type-3, ectromelia, lymphocytic choriomeningitis, adenovirus, and mouse hepatitis viruses. at times of good survival and breeding performance ... | 1986 | 3525873 |
| divergent effects of early hydrocortisone treatment on behavioral and brain development in meadow and pine voles. | developmental effects of a single hydrocortisone (hc) injection (80 micrograms/g on day 2 postnatal) were compared in two closely related species, meadow voles (microtus pennsylvanicus) and pine voles (m. pinetorum). effects of hormone administration were assessed in terms of the development of swimming behavior (head/nose position and front paw movement), alterations in social interactions (spatial location with respect to a stimulus animal), and by changes in somatic and brain growth. although ... | 1986 | 3542640 |
| transfer coefficient of 226ra from food to young weaned meadow voles, microtus pennsylvanicus, in the laboratory. | | 1987 | 3546198 |
| a comparison of blood plasma parameters in wild and laboratory meadow voles (microtus pennsylvanicus). | | 1986 | 3546932 |
| photoperiodic regulation of body mass and fat reserves in the meadow vole. | short photoperiods reduce both body mass and food intake of male meadow voles. to help determine whether the primary effect of short day lengths is on regulation of some component of body mass or on the control of food consumption, voles housed in a long photoperiod were provided rations equivalent to those consumed by animals in short day lengths. animals were transferred to a short photoperiod and after either 3 or 6 weeks of food restriction were fed ad lib. both groups of voles overate after ... | 1986 | 3547428 |
| elimination of 131i in meadow voles (microtus pennsylvanicus) measured by whole-body gamma spectrometry. | | 1987 | 3553074 |
| lyme disease and babesiosis: acaricide focused on potentially infected ticks. | permethrin-treated cotton, intended as rodent nesting material, was distributed in wooded sites in which the agents of lyme disease and babesiosis were enzootic, in order to kill immature ixodes dammini, the ticks that transmit these human pathogens. such ticks feed most abundantly on white-footed mice (peromyscus leucopus), apparently the main reservoir hosts of these agents, and tend to concentrate in mouse burrows. mice captured after permethrin-treated cotton was distributed, were infested b ... | 1987 | 3555140 |
| prevalence of borrelia burgdorferi and babesia microti in mice on islands inhabited by white-tailed deer. | borrelia burgdorferi and babesia microti were isolated from 35 of 51 white-footed mice (peromyscus leucopus) and meadow voles (microtus pennsylvanicus) captured on two narragansett bay, r.i., islands inhabited by deer, the principal host for the adult stages of the vector tick, ixodes dammini. immature ticks parasitized mice from both islands. from 105 mice captured on four other islands not inhabited by deer neither pathogen was isolated, nor were i. dammini found. | 1987 | 3555339 |
| the effects of cross-fostering on the development of social preferences in meadow voles (microtus pennsylvanicus). | to determine the role of the parental environment in the formation of species attachments in the meadow vole (microtus pennsylvanicus), young of this species were fostered to either meadow vole parents (in-fostered young) or to prairie vole parents (m. ochrogaster; cross-fostered young). at 50 to 60 days of age, subjects were tested for social preference in an environment that simulated the conditions of a runway system. the testing design assessed the reaction of fostered animals to a novel spe ... | 1987 | 3555453 |
| effect of 6-methoxybenzoxazolinone on sex ratio and breeding performance in microtus montanus. | the plant derivative, 6-mathoxybenzoxazolinone (6-mboa), which has been demonstrated to initiate reproduction in field populations of the montane meadow vole (microtus montanus), was administered via feeding or silastic capsule implants to mated pairs of laboratory bred m. montanus. the animals remained paired for 120 days, and the number, size, and sex ratios of the resulting litters were recorded. both the size and frequency of litters were significantly greater in 6-mboa-treated pairs than in ... | 1987 | 3555629 |
| long day lengths increase brain weight and dna content in the meadow vole, microtus pennsylvanicus. | male voles reared in long (spring) day lengths had heavier brains with greater total dna content than did males housed in short (fall) day lengths; these effects were not observed in female littermates kept in the two photoperiods. male brains were heavier than female brains in long but not in short photoperiods. day length affected brain mass during early postnatal development, but not when treatments were initiated in adulthood. seasonal differences in brain development, including the numbers ... | 1987 | 3555705 |
| kawasaki syndrome: a controlled study of an outbreak in wisconsin. | the etiology of kawasaki syndrome remains unestablished, although a possible role has been suggested for exposure to the application of carpet shampoo, house dust mites, and rickettsial infection. during an outbreak of 20 cases of kawasaki syndrome that occurred in southeastern wisconsin from november 1982 through march 1983, a case-control study was done of 15 cases and 30 matched controls. the study included questionnaire administration, dust collection from homes, and serum specimen collectio ... | 1986 | 3728445 |
| whole-body biological elimination rates of gamma-emitting radionuclides in captive meadow voles, microtus pennsylvanicus. | the retention of 14 radionuclides was examined in meadow voles (microtus pennsylvanicus) maintained under laboratory conditions. individuals were monitored by whole-body gamma spectroscopy for up to 62 days following intraperitoneal injection with single radionuclides. one- and two-compartment exponential retention curves were fit to the data using nonlinear least-squares regression techniques. slow-component biological half-lives in meadow voles were determined to be 346.6 days (46sc), 31.5 day ... | 1985 | 3908406 |
| definition of three serotypes of hantaviruses by a double sandwich elisa with biotin-avidin amplification system. | a total of seven different isolates of hantaviruses from five mammalian species and six geographical areas were examined by a double sandwich elisa with biotin-avidin amplification system. three serotypes were recognized by comparing antigen titres to homologous and heterologous antibody and blocking antibody titres to homologous and heterologous antigens. serotype 1 included four strains: hantaan virus isolated from apodemus agrarius in south korea, hupei-i isolated from acute-phase serum from ... | 1985 | 3926952 |
| partial characterization of prospect hill virus isolated from meadow voles in the united states. | | 1985 | 3930622 |
| the repeated dna sequences of microtinae. i. microtus agrestis, microtus pennsylvanicus and ellobius lutescens. | | 1973 | 4128137 |
| management of the meadow vole (microtus pennsylvanicus). | | 1969 | 4237325 |
| a diet feeder for weanling meadow voles (microtus pennsylvanicus). | | 1969 | 4240735 |
| ovulation in microtus pennsylvanicus in a laboratory environment. | | 1970 | 4249645 |
| effects of acth on voles (microtus pennsylvanicus) related to reproductive function and renal disease. | | 1971 | 4325775 |
| isolation and in vitro characterization of a herpesvirus from field mouse (microtus pennsylvanicus). | | 1973 | 4351477 |
| effects of cold exposure and seasonal acclimatization on protein and dna synthesis in the rodent microtus pennsylvanicus. | | 1972 | 4404519 |
| effects of metyrapone on reproductive organs of the meadow vole, microtus pennsylvanicus. | | 1974 | 4431001 |
| elevated arterial blood pressure in an asymptotic population of meadow voles (microtus pennsylvanicus). | | 1973 | 4694301 |
| grouping and ovulation in microtus pennsylvanicus. | | 1973 | 4741320 |
| adrenocortical response to captivity in microtus pennsylvanicus. | | 1973 | 4744943 |
| ovaries of meadow voles, microtus pennsylvanicus, after copulation with a series of males. | | 1974 | 4817546 |
| meadow vole nutrition studies with alfalfa diets. | | 1971 | 5098877 |
| meadow vole nutrition studies with semisynthetic diets. | | 1970 | 5481679 |
| oestrus and induced ovulation in the meadow vole, microtus pennsylvanicus. | | 1970 | 5529730 |
| pregnancy-block in the meadow vole, microtus pennsylvanicus. | | 1971 | 5551417 |
| the habitat preference of microtus pennsylvanicus, and its relevance to the distribution of this species on islands. | | 1971 | 5581369 |
| cestode in north dakota: echinococcus in field mice. | field mice (microtus pennsylvanicus and peromyscus maniculatus) are naturally infected with echinococcus multilocularis. thus, the sylvatic cycle (fox to field mice to fox) has been established in north dakota. this cestode is expected to extend its range to other agricultural regions of the continental united states where similar conditions favorable for the completion of its life cycle exist. | 1965 | 5891703 |
| adrenal glands in female voles (microtus pennsylvanicus) as related to reproduction and population size. | | 1966 | 5905557 |