Publications
| Title | Abstract | Year Filter | PMID(sorted descending) Filter |
|---|
| analysis of sex-linked sequences supports a new mammal species in europe. | european mammals have been the focus of particularly detailed taxonomic studies by traditional morphological methods. however, dna analyses have the potential to reveal additional, cryptic species. we describe two highly divergent evolutionary lineages within a small eurasian mammal, the field vole (microtus agrestis). we show that the two lineages can be detected not only with maternally (mitochondrial dna), but also with paternally (y chromosome) and biparentally (x chromosome) inherited dna s ... | 2005 | 15910324 |
| caspase 3 activation in the primary enamel knot of developing molar tooth. | mammalian teeth develop during embryogenesis as epithelio-mesenchymal organs. the primary enamel knot is considered as a signaling center in tooth morphogenesis. after tooth bell formation, this epithelial structure undergoes apoptosis. activation of caspase 3 represents a crucial step in the intracellular death machinery. procaspase 3 and caspase 3 molecules were localized in the primary enamel knot of the field vole using immunohistochemistry. different fixation procedures in cryopreserved and ... | 2006 | 15910164 |
| zoonotic reservoir of babesia microti in poland. | babesiosis is as one of the emerging human and animal diseases transmitted by ticks. it is caused intraerythrocytic parasites of the genus babesia. current evidence of human babesiosis suggests that the majority of cases are involved by babesia divergens and babesia microti piroplasms. as zoonotic reservoir of b. microti serve small mammals--insectivores and rodents. the occurrence of this parasite in natural environment in poland is documented for various regions, in the wide range of mammal ho ... | 2004 | 15787199 |
| origin and developmental fate of vestigial tooth primordia in the upper diastema of the field vole (microtus agrestis, rodentia). | odontogenesis in voles is a convenient model to test hypotheses on tooth development generated from investigations in the mouse. similar to other rodents, the functional dentition of the vole includes a toothless diastema. at its mesial end, a vestigial tooth bud has been found in the upper jaw of vole embryos. the aim of this study was to analyse the developmental dynamics of vestigial tooth structures in the upper diastema of the field vole and to compare it with the situation in the mouse. | 2004 | 15748693 |
| sheep grazing and rodent populations: evidence of negative interactions from a landscape scale experiment. | inter-specific competition, facilitation and predation influence herbivore assemblages, but no study has experimentally explored the interactions between large ungulates and small rodents. in a fully replicated, landscape scale experiment, we manipulated densities of domestic sheep in mountain pastures in norway. we then determined population growth and densities of rodents by live trapping in each of the areas with different sheep densities. we found that the (summer) population growth rate and ... | 2005 | 15726430 |
| apoptosis-related factors (fas receptor, fas ligand, fadd) in early tooth development of the field vole (microtus agrestis). | fas (cd95/apo-1) belongs to the tnf receptor (tnfr) family. fas ligand binding followed by fas-receptor oligomerisation leads to formation of a death-inducing signal complex starting with recruitment of the fas-adapter protein (fadd). components of this initiation complex (fas, fas-l, fadd) were correlated with apoptotic cells, detected by specific dna fragmentation and morphological criteria. apoptotic cells can be detected throughout the embryonic development of molar teeth. restricted temporo ... | 2005 | 15721145 |
| predator-induced synchrony in population oscillations of coexisting small mammal species. | comprehensive analyses of long-term (1977-2003) small-mammal abundance data from western finland showed that populations of microtus voles (field voles m. agrestis and sibling voles m. rossiaemeridionalis) voles, bank (clethrionomys glareolus) and common shrews (sorex araneus) fluctuated synchronously in 3 year population cycles. time-series analyses indicated that interspecific synchrony is influenced strongly by density-dependent processes. synchrony among microtus and bank voles appeared addi ... | 2005 | 15695211 |
| effect of photoperiod on body mass, food intake and body composition in the field vole, microtus agrestis. | many small mammals respond to seasonal changes in photoperiod by altering body mass and adiposity. these animals may provide valuable models for understanding the regulation of energy balance. here, we present data on the field vole (microtus agrestis) - a previously uncharacterised example of photoperiod-induced changes in body mass. we examined the effect of increased day length on body mass, food intake, apparent digestive efficiency, body composition, de novo lipogenesis and fatty acid compo ... | 2005 | 15671345 |
| identification of bartonella species in rodents, shrews and cats in denmark: detection of two b. henselae variants, one in cats and the other in the long-tailed field mouse. | small mammals and stray cats were trapped in two areas of north zealand, denmark, and their blood cultured for hemotrophic bacteria. bacterial isolates were recovered in pure culture and subjected to 16s rdna gene sequencing. bartonella species were isolated from five mammalian species: b. grahamii from microtus agrestis (field vole) and apodemus flavicollis (yellow-necked field mouse); b. taylorii from m. agrestis, a. flavicollis and a. sylvaticus (long-tailed field mouse); b. tribocorum from a ... | 2004 | 15511270 |
| apoptosis distribution in the first molar tooth germ of the field vole (microtus agrestis). | apoptosis represents an important process in organ and tissue morphogenesis and remodeling during embryonic development. a role for apoptosis in shape formation of developing teeth has been suggested. the field vole is a useful model for comparative studies in odontogenesis, particularly because of its contrasting molar morphogenesis when compared to the mouse. however, little is known concerning apoptosis in tooth development of this species. morphological (cellular and nuclear alterations) and ... | 2004 | 15385152 |
| sex-biased maternal investment in voles: importance of environmental conditions. | adaptive bias in sex allocation is traditionally proposed to be related to the condition of mothers as well as to the unequal fitness values of produced sexes. a positive relationship between mother condition and investment into male offspring is often predicted. this relationship was also recently found to depend on environmental conditions. we studied these causalities experimentally using a design where winter food supply was manipulated in eight outdoor-enclosed populations of field voles mi ... | 2004 | 15306337 |
| disease dynamics in cyclic populations of field voles (microtus agrestis): cowpox virus and vole tuberculosis (mycobacterium microti). | the possible role of pathogens in rodent population cycles has been largely neglected since elton's 'epidemic hypothesis' of 1931. to revisit this question, 12 adjacent, cyclic but out-of-phase populations of field voles (microtus agrestis) in north east england were studied and the initial results are presented here. the prevalences of antibodies to cowpox virus and of clinical signs of mycobacterium microti infection (vole tuberculosis) showed delayed (not direct) density dependence (with a la ... | 2004 | 15255106 |
| fluoride in the prey of barn owls (tyto alba). | bone fluoride in short-tailed voles (microtus agrestis) and common shrews (sorex araneus), the prey of barn owls (tyto alba), was studied on anglesey, north wales. the average fluoride content of m. agrestis skulls obtained from a location 0.9 km from an aluminium reduction plant was significantly greater than that of skulls from another location 22 km from the source of industrial fluoride pollution. at both locations, mean fluoride levels of skulls extracted from owl pellets and those of voles ... | 1987 | 15092770 |
| distribution of trace element pollutants in a contaminated grassland ecosystem established on metalliferous fluorspar tailings. 1: lead. | concentrations of lead in vegetation, invertebrates and small mammals in a grassland ecosystem evolved from a mine waste revegetation scheme indicated the high concentration of lead in the original tailings. lead levels in invertebrates reflected dietary concentrations and feeding strategy, a pattern also true of the indigenous small mammals. total body and tissue concentrations of lead in the herbivorous microtus agrestis l. (field vole) and insectivorous sorex araneus l. (common shrew) were si ... | 1989 | 15092440 |
| distribution of trace element pollutants in a contaminated grassland ecosystem established on metalliferous fluorspar tailings. 2: zinc. | concentrations of zinc in vegetation, invertebrates and small mammals in a grassland ecosystem derived from a mine waste vegetation scheme indicated the high concentration of zinc in the original tailings. however, the considerable differences in soil and vegetation zinc concentrations between the tailings and an uncontaminated site were not reflected in the invertebrate and small mammal communities. invertebrate zinc levels and total body concentrations in microtus agrestis l. (field vole) and ... | 1989 | 15092405 |
| distribution of trace element pollutants in a contaminated ecosystem established on metalliferous fluorspar tailings. 3: fluoride. | high total soil fluoride (10 000 microg g(-1)) in the metalliferous fluorspar tailings was reflected by elevated concentrations in standing live vegetation (300-1000 microg g(-1)); plant roots (c. 6000 microg g(-1)); plant litter (c. 4000 microg g(-1)); total body concentrations of invertebrates (400-4000 microg g(-1)) and the small mammals microtus agrestis (120-360 microg g(-1)) and sorex araneus (140-250 microg g(-1)). seasonal changes in the standing live vegetation and the availability of s ... | 1989 | 15092395 |
| fluoride accumulation and toxicity in wild small mammals. | populations of two species of small mammal, the field vole (microtus agrestis l.) and the bank vole (clethrionomys glareolus l.), inhabiting grasslands contaminated by industrial sources of fluoride were examined for fluoride concentrations in skeletal tissue and for morphological changes in the teeth. concentrations of fluoride in teeth and bones were higher for c. glareolus than for m. agrestis at the chemical works and smelter sites. severe dental lesions were recorded on the incisor and mola ... | 1994 | 15091672 |
| predicting cadmium, lead and fluoride levels in small mammals from soil residues and by species-species extrapolation. | the effects of heavy metals on wild mammals are often assessed by analysing residues in body organs. this paper reviews published studies to determine whether cadmium (cd), lead (pb) and fluoride (f) residues in small mammals can be predicted directly from residues in soil or, when this is not possible, from residues in other species. it was found that residues in soil could be used to predict cd and pb concentrations in small mammals. there were significant (p < 0.05) relationships between cd r ... | 1995 | 15091546 |
| polychlorinated biphenyls in small mammals from contaminated landfill sites. | pcbs in small mammals living in a contaminated landfill site varied in both concentration and congener composition, reflecting both the feeding strategy of each species and the chlorination of the congeners. body concentrations of sigmapcb on a 1:1:1 arochlor (1242:1254:1260) basis gave a rank order of sorex araneus > apodemus sylvaticus > microtus agrestis. comparisons with data for other pcb-contaminated sites suggest that the sigmapcb values in s. araneus from the landfill site may be of suff ... | 1996 | 15091398 |
| a striated muscle on the hard palate of rodents and rabbits. | summary a striated muscle of the hard palate has been previously described in some rodents and rabbits. it is not termed in the official veterinary anatomical nomenclature. the aim of this work was to verify the existence of this muscle. heads of the golden hamster (mesocricetus auratus), the guinea pig (cavia aperea f. porcellus), the laboratory rat (rattus norvegicus var. alba), the field vole (microtus agrestis) and the domestic rabbit (oryctolagus cuniculus f. domesticus) have been dissected ... | 2004 | 15027950 |
| optimal body size and energy expenditure during winter: why are voles smaller in declining populations? | winter is energetically challenging for small herbivores because of greater energy requirements for thermogenesis at a time when little energy is available. we formulated a model predicting optimal wintering body size, accounting for the scaling of both energy expenditure and assimilation to body size, and the trade-off between survival benefits of a large size and avoiding survival costs of foraging. the model predicts that if the energy cost of maintaining a given body mass differs between env ... | 2004 | 15026979 |
| on the causative agent of tsutsugamushi disease isolated from field voles, apodemus speciosus speciosus, inhabiting the foot area of mt. fuji in japan. | 1951 | 14825608 | |
| two-year study of examination of blood from wild rodents for the presence of antiborrelian antibodies. | the aim of our work was to find the positivity rate of antibodrrelian antibodies (igg) in wild-living rodents in a locality situated in north moravia, czech republic. results of a survey for heart rinses (172) and sera (2) antibodies to borrelia burgdorferi sensu lato (s.l.) from 6 species of 174 wild rodents from the northern part of the czech republic are presented. samples were obtained in 2001-2002 at one locality (studenka, 49 degrees 44', 18 degrees 05'). host samples included yellow-necke ... | 2003 | 14677912 |
| a highly divergent mitochondrial dna lineage of microtus agrestis in southern europe. | the mediterranean peninsulas constitute important areas for endemism and intraspecific variation, and are likely places for cryptic biodiversity. we assessed the phylogeographic pattern of field voles (microtus agrestis) in southern and central europe by sequence analysis of a 385-bp fragment of the mitochondrial cytochrome b gene in 74 specimens from 44 localities. the majority of samples consisted of skulls collected from owl pellets. the data revealed a highly distinct cytochrome b lineage in ... | 2004 | 14666134 |
| resting and daily energy expenditures of free-living field voles are positively correlated but reflect extrinsic rather than intrinsic effects. | resting metabolic rates at thermoneutral (rmrts) are unexpectedly variable. one explanation is that high rmrts intrinsically potentiate a greater total daily energy expenditure (dee), but recent work has suggested that dee is extrinsically defined by the environment, which independently affects rmrt. this extrinsic effect could occur because expenditure is forced upwards in poor habitats or enabled to rise in good habitats. we provide here an intraspecific test for an association between rmrt an ... | 2003 | 14615588 |
| low levels of nucleotide diversity in mammalian y chromosomes. | sex chromosomes provide a useful context for the study of the relative importance of evolutionary forces affecting genetic diversity. the human y chromosome shows levels of nucleotide diversity 20% that of autosomes, which is significantly less than expected when differences in effective population size and sex-specific mutation rates are taken into account. to study the generality of low levels of y chromosome variability in mammalian genomes, we investigated nucleotide diversity in intron sequ ... | 2004 | 14595096 |
| [existence of an adrenal x zone in the red field vole (clethrionomys glareolus)]. | 1954 | 14365027 | |
| seasonal changes in the adenohypophysis of the vole (microtus agrestis). | 1964 | 14184079 | |
| seasonal changes in the gonads and accessory reproductive organs of the vole (microtus agrestis). | 1964 | 14181474 | |
| variations in the weight of the adrenal glands of the field vole, microtus agrestis. | 1961 | 13693185 | |
| [an unusual dermatosis in field mouse microtus agrestis l. caused by myocoptes tenax michael 1889 (acarina, listrophoridae) & the forgotten myocoptes sciurinus hennemann 1910]. | 1958 | 13558452 | |
| light-induced changes in some endocrine organs of the vole (microtus agrestis). | 1957 | 13463242 | |
| the oestrous cycle and gestation period in the lactating field vole, microtus agrestis. | 1957 | 13463230 | |
| fertilization, early cleavage and associated phenomena in the field vole (microtus agrestis). | 1957 | 13405809 | |
| some aspects of concomitant infections of plasmodia and schistosomes. i. the effect of schistosoma mansoni on the course of infection of plasmodium berghei in the field vole (microtus guentheri). | 1956 | 13381873 | |
| [weight and histological changes in the adrenal glands of the field mouse (microtus agrestis l.) as a function of the sexual state]. | 1955 | 13270470 | |
| the effect of fighting on the adrenals, thymus and spleen of the vole, microtus agrestis. | 1953 | 13034988 | |
| [histochemical modifications of the adrenal cortex of the field vole (microtus arvalis p.) after castration]. | 1952 | 13020061 | |
| exposure of small mammals, in particular the wood mouse apodemus sylvaticus, to pesticide seed treatments. | field exposure of small mammals to fungicide-treated wheat seed was investigated over three weeks following drilling on fields near york, united kingdom. seed consumption by small mammals trapped on and immediately adjacent to the drilled fields was quantified by measuring the amount of seed in the stomach. in addition, exposure to one seed-treatment, fluquinconazole, was quantified by measuring residues of the fungicide in the stomach, liver, and intestine. the wood mouse, apodemus sylvaticus, ... | 2003 | 12729225 |
| quantitative investigation of reproduction of gonosomal condensed chromatin during trophoblast cell polyploidization and endoreduplication in the east-european field vole microtus rossiaemeridionalis. | simultaneous determinations of dna content in cell nuclei and condensed chromatin bodies formed by heterochromatized regions of sex chromosomes (gonosomal chromatin bodies, gcb) have been performed in two trophoblast cell populations of the east-european field vole microtus rossiaemeridionalis: in the proliferative population of trophoblast cells of the junctional zone of placenta and in the secondary giant trophoblast cells. one or two gcbs have been observed in trophoblast cell nuclei of all e ... | 2003 | 12725646 |
| genetic evidence for tula virus in microtus arvalis and microtus agrestis populations in croatia. | to determine the threat of hantavirus infection to u.s. forces, small mammals were sampled from training areas within croatia. of the 152 samples, 20 were positive for tula virus (tul), 12 common voles (microtus arvalis) and eight field voles (microtus agrestis). sequences from m. agrestis were found in five and sequences from m. arvalis were found in six of seven sequence groups. the high percentage of the same tul sequences in m. agrestis and m. arvalis suggests the co-occurrence of this virus ... | 2002 | 12656127 |
| bartonella infection in sylvatic small mammals of central sweden. | sylvatic small mammals were captured in rural habitats near uppsala, sweden, to measure the prevalence of bartonella infections, characterize bacterial isolates and identify their host range, and increase our understanding of host-pathogen ecology. during 7 nights of trapping at 3 localities, 236 small mammals were captured (trap success 30%). bartonella were isolated from bloods of apodemus flavicollis (19 of 110 tested), apodemus sylvaticus (6/25), clethrionomys glareolus (9/60), microtus agre ... | 2003 | 12613756 |
| phytosterols affect endocrinology and metabolism of the field vole (microtus agrestis). | phytosterols or plant sterols (ps) enter the ecosystem via pulp mill effluents. they are also consumed by the general population of developed countries in natural remedies and margarines to lower elevated serum cholesterol levels. this study screened the endocrine and enzymatic parameters of the field vole (microtus agrestis) for the effects of subchronic ps exposure at three doses (0, 5, or 50 mg of ps kg(-1) day(-1)). ps at 5 or 50 mg kg(-1) day(-1) decreased the relative liver weight of the v ... | 2003 | 12563026 |
| [comparison observation on the mature alveolar of echinococcus sibiricensis and echinococcus multilocularis in the experimentally infected white mice]. | the alveolar echinococcus is one of the most dangerous worm parasites in man. rausch and schiller reported a new species, echinococcus sibiricensis n. sp. from arctic fox, alpex logopus, on st. lawrence island of alaska, usa. according to the view of vogel, the sibiricensis form is only a geographical race or subspecies of europe echinococcus multilocularis. so far, the two names, echinococcus multiocularis multilocularis and echinococcus multilocularis sibiricensis, existed in many references a ... | 2001 | 12549203 |
| the wood mouse is a natural host for murid herpesvirus 4. | infection of laboratory mice by the murid herpesvirus 4 (mhv-4) is a much studied model system for gammaherpesvirus pathogenesis. little, however, is known about its natural host range, epidemiology and pathogenesis outside the laboratory. we have studied mhv-4 infection in free-living murids in the uk. using a combination of serology and pcr analysis, we found that mhv-4 was endemic in wood mice (apodemus sylvaticus) but not in two species of voles (clethrionomys glareolus, microtus agrestis). ... | 2003 | 12533706 |
| [quantitative investigation of reproduction of condensed chromatin of sex chromosomes during trophoblast cell polyploidization and endoreduplication in the east european field vole microtus rossiaemeridionalis]. | simultaneous measurement of dna content in cell nuclei and condensed chromatin bodies formed by heterochromatized regions of sex chromosomes (gonosomal chromatin bodies, gcb) has been performed in two trophoblast cell populations of the east-european field vole microtus rossiaemeridionalis, namely in the proliferative population of trophoblast cells of the junctional zone of placenta and in the secondary giant trophoblast cells. one or two gonosomal chromatin bodies have been observed in trophob ... | 2002 | 12506668 |
| the lateral enamel lamina--component of tooth primordia in selected mammalian species. | the lateral enamel lamina (lel) is a part of the enamel organ, which is probably not involved in tooth formation. it represents, besides the "stalk" of the tooth primordium, a second interconnection between enamel organ and oral epithelium or vestibular lamina. we detected the lel in the sheep (ovis aries), the dolphin (stenella attenuata), and the vole (microtus agrestis) by light microscopy and computer-aided three-dimensional reconstruction. the lel could be found in cap to bell stage tooth p ... | 2002 | 12494916 |
| proliferating cell nuclear antigen (pcna) expression in tooth primordia in the field vole (microtus agrestis, rodentia). | cell proliferation in developing tooth germs has been studied particularly using bromodeoxyuridine (brdu) incorporation into growing tooth primordia and by counting and three-dimensional (3d) reconstruction of mitoses in serial sections of developing teeth. pcna has been proposed as an alternative marker of proliferation activity. the aim of our study was to detect immunohistochemically locations of pcna-positive cells in developing tooth germs of microtus agrestis (rodentia). pcna expression co ... | 2002 | 12489149 |
| phylogeography of field voles (microtus agrestis) in eurasia inferred from mitochondrial dna sequences. | in a distribution-wide phylogeographic survey of the field vole (microtus agrestis), 75 specimens from 56 localities across eurasia were examined for dna sequence variation along the whole 1140 base pair (bp) mitochondrial (mt) cytochrome b gene. the species is subdivided into three main mtdna phylogeographic groups - western, eastern and southern - with largely allopatric distributions. the western phylogeographical group is found in west and central europe and spread most probably from a glaci ... | 2002 | 12453244 |
| copy and paste: the impact of a new non-l1 retroposon on the gonosomal heterochromatin of microtus agrestis. | mobile elements are most abundant in the mammalian genome, comprising at least 40-50% of the dna. they are differentiated into two most prominent families: the line elements, which are preferentially located in the g-bands, and sines, which are clustered in the r-bands. we report here a novel mammalian non-l1-retroposon, which invaded the genome of microtus agrestis in a very short time from an evolutionary viewpoint. no relevant sequence homology could be demonstrated to known sequences in the ... | 2002 | 12438796 |
| demographic, mechanistic and density-dependent determinants of population growth rate: a case study in an avian predator. | identifying the determinants of population growth rate is a central topic in population ecology. three approaches (demographic, mechanistic and density-dependent) used historically to describe the determinants of population growth rate are here compared and combined for an avian predator, the barn owl (tyto alba). the owl population remained approximately stable (r approximately 0) throughout the period from 1979 to 1991. there was no evidence of density dependence as assessed by goodness of fit ... | 2002 | 12396509 |
| rodent host specificity of european hantaviruses: evidence of puumala virus interspecific spillover. | in order to investigate rodent host specificity of european hantaviruses, experimental infection of colonized and wild-trapped rodents was performed. in addition to the natural rodent reservoir, clethrionomys glareolus, puumala hantavirus (puuv) could infect colonized microtus agrestis and lemmus sibiricus, but not syrian hamsters or balb/c mice. neither c. glareolus, nor m. agrestis, could be readily infected by tula hantavirus (tulv). wild-trapped apodemus flavicollis and a. agrarius, the natu ... | 2002 | 12376967 |
| mycobacterium microti infection (vole tuberculosis) in wild rodent populations. | mycobacterium microti (vole tuberculosis) infections in small wild mammals were first described more than 60 years ago in several populations in great britain. few studies of vole tuberculosis have been undertaken since then, and little is known about the relationship between m. microti isolates originating from different populations or at different times or of the prevalence of this infection in wild rodent populations, despite human cases of m. microti infections being increasingly reported. i ... | 2002 | 12202566 |
| comparison of glycoprotein hormone alpha-subunits of laboratory animals. | the common alpha-subunit of glycoprotein hormones (cgalpha) is a core protein shared by follicle-stimulating hormone (fsh), luteinizing hormone (lh), and thyroid-stimulating hormone (tsh). in order to obtain a molecular basis for an efficient superovulation technique applicable to a wide range of animal species and to discuss the phylogenetic aspect based on molecules related to the reproductive system, we determined cdna sequences of cgalpha in seven laboratory animals: the guinea pig, mongolia ... | 2002 | 12112597 |
| the consequences of acute cold exposure on protein oxidation and proteasome activity in short-tailed field voles, microtus agrestis. | during cold exposure, animals upregulate their metabolism and food intake, potentially exposing them to elevated reactive oxygen species (ros) production and oxidative damage. we investigated whether acute cold (7 +/- 3 degrees c) exposure (1, 10, or 100 h duration) affected protein oxidation and proteasome activity, when compared to warm controls (22 +/- 3 degrees c), in a small mammal model, the short-tailed field vole microtus agrestis. protein carbonyls and the chymotrypsin-like proteasome a ... | 2002 | 12106821 |
| antioxidant enzyme activities, lipid peroxidation, and dna oxidative damage: the effects of short-term voluntary wheel running. | we examined the effect of voluntary exercise on antioxidant enzyme activities (catalase, glutathione peroxidase, superoxide dismutase) in skeletal muscle (hind- and forelimb) and heart of a model small mammal species: short-tailed field vole microtus agrestis. in addition, dna oxidation was determined in lymphocytes and hepatocytes using the comet assay and lipid peroxidation estimated in hindlimb muscle by measurement of thiobarbituric-acid-reactive substances. voles (approximately 6 weeks old) ... | 2002 | 12054476 |
| bisphenol a affects endocrine physiology and biotransformation enzyme activities of the field vole (microtus agrestis). | bisphenol a (bpa), an environmental estrogen, was given subcutaneously for 4 days to 48 field voles at three doses (10, 50, or 250 mg kg(-1) day(-1)). plasma sex steroids, thyroxine, weight-regulatory hormones, and liver biotransformation enzymes were determined. there was no mortality in the control group but the mortality in the bpa-exposed animals was significant. bpa increased the plasma testosterone concentrations at 250 mg bpa kg(-1) day(-1). the plasma ghrelin levels measured from pooled ... | 2002 | 12030774 |
| generation of periodic waves by landscape features in cyclic predator-prey systems. | the vast majority of models for spatial dynamics of natural populations assume a homogeneous physical environment. however, in practice, dispersing organisms may encounter landscape features that significantly inhibit their movement. we use mathematical modelling to investigate the effect of such landscape features on cyclic predator-prey populations. we show that when appropriate boundary conditions are applied at the edge of the obstacle, a pattern of periodic travelling waves develops, moving ... | 2002 | 11886619 |
| hypothalamo-neurohypophysial magnocellular neuroendocrine system of field voles after acute heat or cold stress. | hypothalamo-neurohypophysial magnocellular neuroendocrine system (h-nh mc nes) of field voles was described in normal conditions and after acute heat or cold stress. 60 mature males of field voles were used for examinations after 2 weeks of adaptation to stable conditions of laboratory keeping. 10 animals were the controls. another group of 25 field voles were subjected to sudden cold of -15 degrees c for 3 hours. the third group of 25 field voles were subjected to sudden heat of +32 degrees c f ... | 2000 | 11712427 |
| differences in the meiotic pairing behavior of gonosomal heterochromatin between female and male microtus agrestis: implications for the mechanism of heterochromatin amplification on the x and y. | it is generally thought that pairing and recombination between the x and y chromosome in eutherian mammals is important for the occurrence of normal meiotic division and the production of functional gametes. microtus agrestis is one of the examples whose giant and heterochromatin-rich sex chromosomes fail to establish a durable association at any stage of the first meiotic division in males. in contrast, in females, synapsis starts in the euchromatic short arm and pairing progresses unidirection ... | 2000 | 11173866 |
| can non-shivering thermogenesis in brown adipose tissue following na injection be quantified by changes in overlying surface temperatures using infrared thermography? | we aimed to investigate whether infra red thermography (irt) can be used to measure and quantify non-shivering thermogenesis (nst) in the short-tailed field vole microtus agrestis, by directly comparing it with a standard method, i.e. metabolic response following noradrenaline injection (na). mean skin surface temperature overlying brown adipose tissue (bat) depot was 0.82 degrees c higher than mean surface temperature that did not overly bat. the difference in temperature increased by 1.26 degr ... | 2001 | 11163923 |
| role of small mammals in the persistence of louping-ill virus: field survey and tick co-feeding studies. | louping-ill (li) is a tick-borne viral disease of red grouse, lagopus lagopus scoticus lath. (tetraonidae: galliformes), and sheep, ovis aries l. (bovidae: artiodactyla), that causes economic loss to upland farms and sporting estates. unvaccinated sheep, grouse and mountain hares, lepus timidus l. (leporidae: lagomorpha), are known to transmit li virus, whereas red deer, cenrus elaphus l. (cervidae: artiodactyla), and rabbits, oryctolagus cuniculus l. (leporidae: lagomorpha), do not. however, th ... | 2000 | 11016435 |
| effect of long-term cold exposure on antioxidant enzyme activities in a small mammal. | aerobic organisms continually face exposure to reactive oxygen species (ros) and many have evolved sophisticated antioxidant systems to effectively remove them. any increase in ros production or weakening in this defense system may ultimately lead to oxidative stress and cellular damage. we investigated whether long-term cold exposure, which is known to lead to an elevation in metabolic rate, increased the activities of the ros-scavenging enzymes, catalase (cat), selenium-dependent glutathione p ... | 2000 | 10889458 |
| genetic and morphological heterogeneity in small rodent whipworms in southwestern europe: characterization of trichuris muris and description of trichuris arvicolae n. sp. (nematoda: trichuridae). | genetic and morphological variability of whipworms trichuris roederer, 1761 (nematoda: trichuridae), parasites of small rodents in southwestern europe, was studied. isozyme patterns of natural populations of nematodes parasitizing rodent species of the muridae (apodemus sylvaticus, apodemus flavicollis, mus musculus) and arvicolidae (clethrionomys glareolus, microtus agrestis, microtus arvalis) were analyzed at 6 putative loci. two diagnostic loci were found in t. muris from muridae and from arv ... | 2000 | 10864238 |
| disease patterns in field and bank vole populations during a cyclic decline in central finland. | declining field vole (microtus agrestis) and bank vole (clethrionomys glareolus) populations were sampled (117 field voles and 34 bank voles) in south-central finland during the winter of 1988-89. the last surviving field voles were caught in april and bank voles in february. a subsample (16) of the april field voles were taken live to the laboratory for immunosuppression. the histopathology of the main internal organs and the presence of aerobic bacteria and certain parasites were studied. in t ... | 2000 | 10670697 |
| male short-tailed field voles (microtus agrestis) build better insulated nests than females. | nest construction is an extremely widespread behaviour. in small endotherms the nest serves primarily to provide insulation, and thereby retard heat loss of the constructor, or its offspring. in arctic and temperate regions many small mammals build nests to protect themselves from low ambient temperatures. we measured the physical properties of nests built by short-tailed field voles microtus agrestis that were kept in captivity under cold conditions. the most important factor influencing nest i ... | 1999 | 10633563 |
| cowpox: reservoir hosts and geographic range. | it is generally accepted that the reservoir hosts of cowpox virus are wild rodents, although direct evidence for this is lacking for much of the virus's geographic range. here, through a combination of serology and pcr, we demonstrate conclusively that the main hosts in great britain are bank voles, wood mice and short-tailed field voles. however, we also suggest that wood mice may not be able to maintain infection alone, explaining the absence of cowpox from ireland where voles are generally no ... | 1999 | 10459650 |
| preliminary observations of the cytological structure of the hypothalamo-neurohypophyseal magnocellular neuroendocrine system in field voles after acute thermal stress. | 1999 | 10352964 | |
| immunocytochemical study of parafollicular (c) cells of the thyroid in some wild rodents. | studies were done on 3 wild species of rodents: field voles (microtus agrestis, linnaeus 1761), bank voles (clethrionomys glareolus, schreber 1780), and forest mice (apodemus flavicollis, melchior 1834). immunocytochemical reactions were used to detect calcitonin (ct), calcitonin gene-related peptide (cgrp), neuron-specific enolase (nse), chromogranin a (cga) in the thyroid parafollicular (c) cells in all species examined. antisera to human ct, rat cgrp, bovine cga, rat nse and human nse give pr ... | 1999 | 10332521 |
| seasonal dynamics of pneumocystis carinii in the field vole, microtus agrestis, and in the common shrew, sorex araneus, in finland. | seasonal dynamics of pneumocystis carinii in the field vole, microtus agrestis, and in the common shrew, sorex araneus, were investigated in southern and central finland by microscopical examination of methenamine silver-stained tissue sections. in both host species at both localities the number of p. carinii cyst forms was highest in late autumn (november). in s. araneus, prevalence was higher than in m. agrestis during all seasons. none of the animals was heavily infected or apparently ill, an ... | 1999 | 10070655 |
| interspecific and intraspecific competition as causes of direct and delayed density dependence in a fluctuating vole population. | a 3- to 5-year cycle of vole abundances is a characteristic phenomenon in the ecology of northern regions, and their explanation stands as a central theoretical challenge in population ecology. although many species of voles usually coexist and are in severe competition for food and breeding space, the role of interspecific competition in vole cycles has never been evaluated statistically. after studying community effects on the population dynamics of the gray-sided vole (clethrionomys rufocanus ... | 1999 | 9927680 |
| polymorphic microsatellite dna markers in the field vole microtus montebelli. | 1999 | 9919707 | |
| spatial asynchrony and periodic travelling waves in cyclic populations of field voles. | we demonstrate evidence for the presence of travelling waves in a cyclic population of field voles in northern britain by fitting simple, empirical models to spatially referenced time series data. population cycles were broadly synchronous at all sites, but use of mantel correlations suggested a strong spatial pattern along one axis at a projection line 72 degrees from north. we then fitted a generalized additive model to log population density assuming a fixed-form travelling wave in one spatia ... | 1998 | 9744104 |
| beta-heterochromatin in mammals: evidence from studies in microtus agrestis based on the extensive accumulation of l1 and non-l1 retroposons in the heterochromatin. | the heterochromatin of microtus agrestis contains two retroposons, one l1 and one non-l1, which were cloned and analyzed with respect to their structure and genomic organization. these sequences have accumulated in the heterochromatin and exhibit a complex interspersed organization of relatively recent origin. in contrast, the pericentromeric heterochromatin is composed of simple, repetitive, tandemly organized elements. from the underlying sequences, the dinucleotide frequencies, the sequence o ... | 1998 | 9678352 |
| effects of a soft diet and hypothyroidism on the oxidative capacity of the masseter muscle fibers of the young japanese field vole microtus montebelli. | effects of a soft diet (reduction in mastication activity: an exogenous factor) and hypothyroidism (endogenous factors) on the oxidative capacity of the masseter muscles in the young japanese field vole microtus montebelli, consisting only of fast-twitch oxidative (fo) fibers in the adult vole, was investigated histochemically and electron microscopically. oxidative enzyme activity and mitochondrial development in the muscle fibers were not affected by a soft diet, while they were suppressed by ... | 1998 | 9615621 |
| serosurvey for orthopoxviruses in rodents and shrews from norway. | two hundred and twenty one blood samples representing eight different rodent species and the common shrew (sorex araneus), collected in norway between 1993 and 1995, were examined for anti-orthopoxvirus antibodies by a competition enzyme linked imunnosorbent assay (elisa) and, when possible, an indirect immunofluorescence assay. the serological results indicated that the bank vole (clethrionomys glareolus), woodmouse (apodemus sylvaticus) and norway lemming (lemmus lemmus) may be reservoir speci ... | 1998 | 9577770 |
| postnatal development of the masseter muscles in the japanese field vole microtus montebelli, with special attention to differentiation of the fast-twitch oxidative fiber. | postnatal development and differentiation of the masseter muscles consisting only of fast-twitch oxidative (fo) fibers in the adult japanese field vole microtus montebelli were studied using histochemical and electron microscopic techniques. the masseter muscles were composed of myotubes and muscle fibers at day 0 (birth day). most muscle cells showed the strong reaction for myosin atpase after both alkaline and acid preincubations. for nadh-dehydrogenase (nadh-dh), small granular diformazan dep ... | 1997 | 9450394 |
| pattern of x-y chromosome pairing in the japanese field vole, microtus montebelli. | pairing of x and y chromosomes at meiotic prophase in males of microtus montebelli was analyzed. the sex chromosomes form a synaptonemal complex at pachytene and end-to-end association at diakinesis-metaphase i in two species of the genus microtus (m. montebelli and m. oeconomus) only, while they do not pair at all in the other species of this genus that have been studied so far. these data confirm that m. montebelli and m. oeconomus are very closely related in their origin. it is suggested that ... | 1997 | 9449794 |
| disturbances of the mineral incorporation in various species of mice and shrews in the emission area of a phosphate plant. | the cd emission of a phosphate plant was clearly reflected by the cd status of herbivorous european wood mice and common field voles as well as of european shrews taking in mostly animal food. the antagonistic effect of the emitted cd and mo better available for plants with high ground ph most probably caused the deterioration in the cu status of the animals of both phases in the nutritional chain. the lower ca, p, and mg incorporation with european wood mouse and common field vole within the co ... | 1997 | 9404674 |
| the effect of cowpox virus infection on fecundity in bank voles and wood mice. | although epidemic infectious diseases are a recognized cause of changes in host population dynamics, there is little direct evidence for the effect of endemic infections on populations. cowpox virus is an orthopoxvirus which is endemic in bank voles (clethrionomys glareolus), wood mice (apodemus sylvaticus) and field voles (microtus agrestis) in great britain. it does not cause obvious signs of disease nor does it affect survival, but in this study we demonstrate experimentally that it can reduc ... | 1997 | 9364786 |
| spontaneous and radiation-induced micronuclei in erythrocytes from four species of wild rodents: a comparison with cba mice. | almost 100 animals of 4 different species of small wild rodents (bank vole, clethrionomys glareolus; field vole, microtus agrestis; yellow-necked mouse, apodemus flavicollis; and wood mouse, apodemus sylvaticus) were trapped in central sweden and used in experiments to determine the spontaneous and radiation-induced frequencies of polychromatic (fmpce) and normochromatic erythrocytes (fmnce) from bone marrow (bm) and peripheral blood (pb) using flow cytometric analysis. the results were compared ... | 1997 | 9357562 |
| investigations of pneumocystosis among humans and rodents in lithuania. | pneumocystosis (pneumocystis carinii pneumonia) is a parasitic disease which in lithuania used to be diagnosed only with the use of pathohistological methods. the aim of our study was to determine prevalence of p. carinii antibodies among children and women, using immunochemical method (elisa) and to find out which groups of patients have higher antibody titres. we also addressed the question of infection with p. carinii among rodents. after investigating 9 species of rodents it was found that m ... | 1997 | 9259608 |
| basal metabolic rate in relation to body composition and daily energy expenditure in the field vole, microtus agrestis. | basal metabolic rate in the field vole (microtus agrestis) was studied in relation to body composition and daily energy expenditure in the field. daily energy expenditure was measured by means of doubly labelled water (d2 18o). in the same individuals, basal metabolic rate was subsequently derived from o2 consumption in an open-circuit system in the laboratory. body composition was obtained by dissecting the animals and determining fresh, dry, and lean dry mass of different organs. daily energy ... | 2013 | 9231410 |
| [the distribution of leptospirae in the icterohaemorrhagiae serogroup]. | the capacity of leptospiras to get acclimated in the organism of unusual hosts has been studied. cultures of icterohaemorrhagiae from musquashes, house mice and field voles have been isolated of leptospirosis sources under intensive epizootics among rats. a possibility to reproduce leptospira carrying by the cultures of leptospirae of serogroup icterohaemorrhagiae in musquashes and water voles has been shown. one can conclude that under icterohemorrhagic leptospirosis musquashes and water voles ... | 1997 | 9221063 |
| the origin and distribution of the lund y chromosome in microtus agrestis (rodentia, mammalia). | the lund y (lu-y) chromosome of the field vole (microtus agrestis) is distinguished from the standard y (st-y) by its much longer short arm. g-banding revealed that the lu-y originated by a pericentric inversion in the st-y. chromosome analysis of 297 male field voles from 92 localities in fennoscandia. germany, and england, in addition to data from the literature, made it possible to map the distribution area of the lu-y. it is restricted to the south-western parts of sweden. the question of wh ... | 1997 | 9175492 |
| pneumocystis carinii of the common shrew, sorex araneus, shows a discrete phenotype. | we carried out an immunohistological and morphological study on pneumocystis carinii originating from the common shrew, sorex araneus. immunologic properties were studied by applying two commercially available immunofluorescence staining kits with differing developmental form specificity to a lung homogenate. the cyst form-specific staining kit reacted with cysts originating from s. araneus. ultrastructurally this particular antigen epitope specifically deposited on the electron-lucent middle la ... | 1997 | 9109260 |
| fluoride-induced lesions in the teeth of the short-tailed field vole (microtus agrestis): a description of the dental pathology. | the effect of fluoride on the appearance of the teeth of the short-tailed field vole, microtus agrestis, was investigated in both wild animals collected from field sites affected by different levels of industrial fluoride contamination and laboratory-reared animals consuming experimental grass diets of known fluoride concentration or with known fluoride concentrations in drinking water. the extent and severity of lesions on the surface and structure of both incisors and molars are described as s ... | 1997 | 9097466 |
| cowpox in british voles and mice. | serosurveys indicate that bank voles, field voles and woodmice are probably reservoir hosts of cowpox virus in western europe, although virus has not yet been isolated from these species. in this study, bank voles, field voles, woodmice and laboratory mice were shown to be susceptible to combined intradermal and subcutaneous inoculation with 3-20 plaque-forming units (pfu) of cowpox virus. bank and field voles, but not laboratory mice, were also susceptible to combined oral and nasal inoculation ... | 1997 | 9076598 |
| effects of saturated fatty acids on amylase release from exocrine pancreatic segments of sheep, rats, hamsters, field voles and mice. | stimulatory effects of saturated fatty acids consisting of 4 (butyrate), 8 (octanoate), 12 (laurate) and 16 (palmitate) carbon atoms, as well as acetylcholine on pancreatic amylase release were assessed in tissue segments isolated from sheep, rats, hamsters, field voles and mice. the amount of amylase release induced by the fatty acids (1 mumol.l-1 to 10 mml.l-1) and by acetylcholine (10 nmol.l-1 to 100 mumol.l-1) increased in a concentration-dependent manner, and the maximum response in respons ... | 1996 | 8870261 |
| effect of hypotaurine on in vitro fertilization and production of term offspring from in vitro-fertilized ova of the japanese field vole, microtus montebelli. | the present study was proposed to establish new in vitro fertilization (ivf)-embryo transfer techniques for wild mammals. we demonstrated that ivf of the japanese field vole, microtus montebelli, is improved by hypotaurine, and that ivf vole embryos can develop to normal offspring after transfer to recipient females. the rate of ivf was significantly increased when 0.1 or 1 mm of hypotaurine was added during sperm preincubation and fertilization (p < 0.05). preincubation of spermatozoa with 1 mm ... | 1996 | 8835384 |
| summer acclimatization in the short-tailed field vole, microtus agrestis. | we investigated the changes that occurred in basal and noradrenaline-induced metabolic rate, body temperature and body mass in short-tailed field voles, microtus agrestis, during exposure to naturally increasing photoperiod and ambient temperature. these parameters were first measured in winter-acclimatized voles (n = 8) and then in the same voles which had been allowed to seasonally acclimatize to photoperiod and ambient temperature (6 months later). noradrenaline induced metabolic rate, basal ... | 1996 | 8810068 |
| seasonal incidence of ixodes ricinus ticks (acari:ixodidae) on rodents in western france. | data collected from a longitudinal survey carried out over 2 years on four farms in western france were used to assess the incidence and infestation of ixodes ricinus on rodents. once a month, on each farm, 25 sherman live traps were set in hedges bordering selected pastures. a total of 799 micromammals were examined, including apodemus sylvaticus, clethrionomys glareolus, microtus agrestis, microtus arvalis, and crocidura spp. larvae and nymphs of i. ricinus were found. small numbers of ixodes ... | 1996 | 8771769 |
| penetration by field vole spermatozoa of mouse and hamster zonae pellucidae without acrosome reaction. | spermatozoa of the field vole (microtus montebelli) that bound to the zona pellucida of field vole oocytes underwent the acrosome reaction before passing through it. in contrast, vole spermatozoa that bound to the zonae of mouse and hamster oocytes penetrated the zonae without any sign of the acrosome reaction. the presence or absence of proteinase/hyaluronidase inhibitors in the medium did not make any difference to zona penetration by acrosome-intact vole spermatozoa. these observations sugges ... | 1996 | 8699440 |
| evolution of the gonosomal heterochromatin of microtus agrestis: rapid amplification of a large, multimeric, repeat unit containing a 3.0-kb (gata)11-positive, middle repetitive element. | the sex chromosomes of microtus agrestis are extremely large due to the accumulation of constitutive heterochromatin. we have cloned and characterized a 2,999-bp (gata)n-positive sequence, following haeiii digestion, that is confined to the noncentromeric heterochromatin of the x chromosome. the cloned element exhibits an accumulation of certain oligomers, which are scattered throughout its entire length, and several copies of chi-related sequence motifs, which are thought to be implicated in re ... | 1996 | 8697802 |
| [role of enzymes in the nonspecific cutaneous glands in the marking behavior of field voles of the clethrionomys species]. | 1996 | 8664841 | |
| fluoride accumulation and toxicity in laboratory populations of wild small mammals and white mice. | a laboratory experiment was conducted to compare the toxicological response and metabolism of inorganic fluoride by three species of wild mammals and laboratory white mice (mus musculus l.). the experimental populations of the wild species--the short-tailed field vole (microtus agrestis l.), the bank vole (clethrionomys glareolus l.) and the the wood mouse (apodemus sylvaticus l.)--were laboratory reared from wild stock, and all test animals were exposed to 0, 40 or 80 microgram f per ml in thei ... | 1995 | 8603928 |
| oral transmission of trypanosomes of the subgenus herpetosoma from small mammals. | the rodents microtus agrestis, clethrionomys glareolus, apodemus sylvaticus and white bk rats were given either a single intraperitoneal (i.p.) injection, an intragastric (i.g.) inoculation or an oral (p.o.) inoculation of the culture forms, including metacyclic trypomastigotes, of trypanosoma microti, t. evotomys, t. grosi and t. lewisi, respectively. similar levels of parasitaemia were produced by each of the three routes of infection, although the prepatent period was 3-5 days shorter in the ... | 1995 | 8570586 |
| in vitro cultivation of trypanosoma acomys: production of insect stages and bloodstream forms. | when trypanosoma acomys bloodstream forms were cultivated at 37 degrees c in schneider's drosophila medium supplemented with 20% (v/v) heat-inactivated foetal calf serum (fcs), with microtus agrestis embryonic fibroblasts in rpmi 1640 medium supplemented with 20% fcs or in baltz's medium supplemented with 10% fcs, the parasites transformed and largely remained as epimastigotes. epimastigotes were also usually the commonest stage observed when the parasites were co-cultivated with a mosquito cell ... | 1995 | 8570583 |
| [adrenocortical zonation in the laboratory japanese field vole (microtus montebelli)]. | adrenocortical zonation in the laboratory japanese field vole (microtus montebelli) was investigated histologically with special attention to the sex and species specific differences. the whole cortex and zona reticularis showed clear sex differences. they were thicker in females than in males. in this respect the vole was similar to the mouse and rat, but different from the syrian hamster and mastomys. male cortices were characterized by thick z. fasciculata and meagre z. reticularis, while bot ... | 1993 | 8519305 |
| uterine morphology and the distribution of granulated metrial gland cells in the virgin and pregnant short-tailed field vole, microtus agrestis. | the morphology of the uterine wall in the virgin pregnant and postpartum short-tailed field vole (microtus agrestis) was studied with particular reference to the distribution of granulated metrial gland (gmg) cells. in comparison with the mouse, the changes which occur in the uterine wall during pregnancy and into the postpartum period are broadly similar. however, unlike in the mouse, gmg cells were a feature of the uterine wall in virgin mice and of the antimesometrial decidua in pregnancy. in ... | 1993 | 8509302 |