| isolation of serotype hardjo and other leptospirae from armadillos in argentina. | a serologic, bacteriologic, and histopathologic examination for leptospires was carried out on 89 armadillos (chaetophractus villosus) from argentina. forty-seven per cent of the serum samples yielded positive results when tested by microscopic-agglutination. predominant agglutination reactions were to the hebdomadis and bataviae serogroups. a total of 15 leptospira isolations (from 16.8 per cent of the animals tested) were obtained from kidney tisse. nine of the isolates were identified as belo ... | 1977 | 901969 |
| purification and partial structural characterization of a fatty acid-binding protein from the liver of the south american armadillo chaetophractus villosus. | the fatty acid-binding protein (fabp) from armadillo liver was purified to homogeneity by a procedure involving gel filtration and two anion exchange chromatography steps. the purified protein proved to have a pi between 5.0 and 5.2 and migrated by sodium dodecyl sulfate-polyacrilamyde gel electrophoresis as a single entity of approximately 14 kda. the armadillo fabp cross-reacted with antiserum against rat liver fabp but not against rat intestinal fabp. the same as other members of the family, ... | 1997 | 9418007 |
| presence of a fatty acid-binding protein in the armadillo harderian gland. | a fatty acid-binding protein from the cytosolic fraction of the armadillo chaetophractus villosus harderian gland was purified to homogeneity by a procedure based on gel filtration and sodium dodecyl sulfate-polyacrylamide gel electrophoresis. the protein has an apparent molecular mass of 14 kda. n-terminal sequence analysis showed that the protein has a blocked n-terminus. for internal amino acid sequencing, the protein was digested in-gel and the resulting peptides were fractionated by reverse ... | 1998 | 9675880 |
| molecular evolution of leptin. | leptin, a hormone produced mainly by adipocytes, is involved in the regulation of food intake, metabolism, and reproduction. the objective of this study was to determine the evolutionary relationships of leptin genes. partial nucleotide sequences of leptin were cloned and sequenced from six mammalian species: large hairy armadillo (chaetophractus villosus), rabbit (oryctolagus cuniculus), big brown bat (eptesicus fuscus) [corrected], striped skunk (mephitis mephitis), raccoon (procyon lotor), an ... | 2001 | 11703084 |
| major plasma lipids and fatty acids in four hdl mammals. | lipid classes and their fatty acids were compared in plasma from four mammals: a laboratory rodent, the mouse; two domestic animals, the cat and dog; and a wild animal, the south american armadillo, chaetophractus villosus. in all, the most abundant lipoprotein was high-density lipoprotein (hdl). in the total lipid of plasma, phospholipids (pl) predominated in all four species, in correlation with the proportion of hdl, both being largest in dogs. the major pl was phosphatidylcholine (pc), follo ... | 2002 | 12020646 |
| a study of platelets in the armadillo chaetophractus villosus (xenarthra, dasypodidae). | nothing is known about haemostasis in xenarthra, a widely distributed order of american mammalians. chaetophractus villosus, a member of the dasypodidae family of this group, which is easily adapted to captivity, is of growing interest for biomedical research. in this work, we studied platelet number, mpv, ultrastructure of the platelets by sem and tem, and aggregation responses to adp and ristocetin in this species. blood samples were obtained by cardiac puncture in 20 anaesthetised animals. pl ... | 2004 | 15370098 |
| chromosomal localization of the telomeric (ttaggg)n sequence in four species of armadillo (dasypodidae) from argentina: an approach to explaining karyotype evolution in the xenarthra. | the distribution of the vertebrate telomeric sequence (ttaggg)(n) in four species of armadillos (dasypodidae, xenarthra), i.e. chaetophractus villosus (2n = 60), chaetophractus vellerosus (2n = 62), dasypus hybridus (2n = 64) and zaedyus pichiy (2n = 62) was examined by fish with a peptide nucleic acid (pna) probe. besides the expected telomeric hybridization, interstitial (centromeric) locations of the (ttaggg)n sequence were observed in one chromosome pair of chaetophractus vellerosus and zaed ... | 2005 | 16331409 |
| synaptonemal complexes and xy behavior in two species of argentinian armadillos: chaetophractus villosus and dasypus hybridus (xenarthra, dasypodidae). | spermatocytes from the two armadillo species, c. villosus and d. hybridus were studied in microspreads for synaptonemal complexes (scs) and in thin sections for electron microscopy (em). the complete sc karyotype generally agrees with previous reports on mitotic chromosomes, except for the sex chromosomes. the x chromosome is submetacentric in both species and the y is the shortest one in c. villosus and the second shortest in d. hybridus, and an extremely acrocentric one. a sc is formed along t ... | 2006 | 16845830 |
| structure of armadillo acbp: a new member of the acyl-coa-binding protein family. | the x-ray structure of the tetragonal form of apo acyl-coa-binding protein (acbp) from the harderian gland of the south american armadillo chaetophractus villosus has been solved. acbp is a carrier for activated long-chain fatty acids and has been associated with many aspects of lipid metabolism. its secondary structure is highly similar to that of the corresponding form of bovine acbp and exhibits the unique flattened alpha-helical bundle (up-down-down-up) motif reported for animal, yeast and i ... | 2006 | 17012783 |
| sexual dimorphism in the mandible of the armadillo chaetophractus villosus (desmarest, 1804) (dasypodidae) from northern patagonia, argentina. | the aim of this study was to study the sexual dimorphism in adult chaetophractus villosus (desmarest, 1804), from northern patagonia, argentina. eight mandibular traits were measured in 37 males and 34 females. univariate and multivariate morphometric analysis were applied to the data set. results showed that c. villosus was sexually dimorphic, with higher absolute values corresponding to females. the total length of the mandible was the most important variable to discriminate sexes, followed by ... | 2009 | 19675937 |
| phylogeography of the armadillo chaetophractus villosus (dasypodidae xenarthra): post-glacial range expansion from pampas to patagonia (argentina). | we report a phylogeographic study of chaetophractus villosus populations in argentina. control region (cr) sequences (484 bp) were obtained for 76 c. villosus from 20 locations across the species whole distribution range. seventeen new haplotypes were identified. the highest genetic variation and the earliest fossils were found in the pampean region, thus appearing as the most probable area of origin of the species. a general pattern of contiguous range expansion (cre) was revealed by nested cla ... | 2010 | 20056164 |
| trichinella infection in wild animals from endemic regions of argentina. | natural infection with trichinella has been described in more than 150 mammalian species. however, few reports of trichinella infection in wild animals have come from argentina. in this study, muscle tissue was obtained from wild animals in argentina with the aim of evaluating the presence of trichinella. a total of 169 muscle samples were collected to determine the presence of trichinella larvae by artificial digestion. the 169 muscle samples originated from 12 species including 36 opossums (di ... | 2010 | 20424859 |
| [effect of the interruption of the connections of a simple cortical system (olfactory bulb) with the rest of the brain: comparative study in chaetophractus villosus (tatou) and lagostomus maximus (viscache)]. | | 2014 | 4282331 |
| brucella suis in armadillos (chaetophractus villosus) from la pampa, argentina. | brucellosis is a zoonotic disease transmitted from an animal reservoir to humans. both, wildlife and domestic animals, contribute to the spreading of these zoonosis. the surveillance of the animal health status is strictly regulated for domestic animals, whereas disease monitoring in wildlife does not exist. the aim of the present study was to provide data on the prevalence of anti-brucella antibodies in chaetophractus villosus from a region of la pampa, argentina to assess public health risks. ... | 2014 | 24685240 |
| first isolation of leptospira interrogans from lycalopex griseus (south american gray fox) in argentina shows new mlva genotype. | to identify carriers of leptospira spp. in argentina, wild animals were trapped in buenos aires province during three nights, capturing 12 didelphis albiventris (white-eared opossum), six chaetophractus villosus (big hairy armadillo), five lycalopex griseus (south american gray fox), and two conepatus chinga (molina's hog-nosed skunk). all were tested by microscopic agglutination test, and five (two gray foxes, two armadillos, and one skunk) were positive for leptospira interrogans serovars cani ... | 2013 | 23307384 |
| first record of toxoplasma gondii in chaetophractus villosus in argentina. | toxoplasma gondii is an obligate intracellular apicomplexan parasite that causes abortion and reproductive disorder in domestic animals. t. gondii is a common worldwide disease in homeothermic animals, including birds and humans. the aim of the present study was to determine the presence of antibodies against t. gondii in the armadillo chaetophractus villosus in the province of la pampa, argentina. serum samples were collected from 150 individuals (70 males and 80 females). for serological detec ... | 2014 | 26204031 |
| chromosome studies in edentata. | the karyotypes of three additional species of edentata are described. the differences in karyotype between tolypeutes matacus (2n = 38), and other species of armadillo is remarkable. three species of euphractini were compared through g- and c-banding patterns. chaetophractus villosus appears to be much closer to zaedyus pichiy than suggested by taxonomy. on the other hand, tamandua tetradactyla and tamandua longicaudata, two different species of anteater, possess the same karyotypes. the presenc ... | 1978 | 679723 |
| spermatogenesis is seasonal in the large hairy armadillo, chaetophractus villosus (dasypodidae, xenarthra, mammalia). | very little is known about the distinct reproductive biology of armadillos. very few studies have investigated armadillo spermatogenesis, with data available only for euphractus sexcinctus and dasypus novemcinctus. in the present study, we analysed male germ cell differentiation in the large hairy armadillo chaetophractus villosus throughout the year, describing a cycle of the seminiferous epithelium made of eight different stages. evaluation of the testis/body mass ratio, analysis of the archit ... | 2013 | 22951275 |
| the fetomaternal interface in the placenta of three species of armadillos (eutheria, xenarthra, dasypodidae). | placental characters vary among xenarthra, one of four supraordinal clades of eutheria. armadillos are known for villous, haemochorial placentas similar to humans. only the nine-banded armadillo has been well studied so far. | 2012 | 22559925 |
| presence of antibodies against leptospira serovars in chaetophractus villosus (mammalia, dasypodidae), la pampa province, argentina. | leptospirosis is a zoonosis of worldwide distribution. the aim of this study was to examine the presence of antibodies against 21 leptospira reactive serovars in chaetophractus villosus in la pampa province, argentina, using the microscopic agglutination test (mat). pathologic changes compatible with leptospirosis and in situ detection of the agent by immunohistochemistry were studied in 24 and 3 individuals respectively. only 35/150 (23.3%) serum samples had antibodies against leptospira sp. si ... | 2015 | 25754485 |
| a new species of moennigia (trichostrongylina: molineidae) a parasite of chaetophractus spp. (xenarthra: dasypodidae) from argentina. | moennigia celinae n. sp. collected from the small intestine of chaetophractus vellerosus and chaetophractus villosus (xenarthra, dasypodidae) from argentina is herein described. this new species belongs to the genus moennigia because it possesses a short uterus with few eggs, atrophied distal branch of the ovejector, vulva near the anus, and a conical tail. the new species has a synlophe with 17 symmetrical ridges and slight ventro-dorsal orientation. the spicule length:body length ratio is simi ... | 2014 | 24552210 |
| karyotype and chromosome variability in the armadillo chaetophractus villosus in argentina. | karyotype and cytotype variations for the large hairy armadillo (chaetophractus villosus) were studied throughout the species' argentine distribution. peripheral blood lymphocyte cultures of 421 animals were used to obtain mitotic metaphases. preparations were subjected to conventional staining, g- and c-banding, and fish involving a telomeric probe. meiotic analysis was performed on testis material from 10 adults. spermatocytes were examined for synaptonemal complexes in microspreads. the karyo ... | 2014 | 24457264 |
| classics revisited: miguel fernández on germ layer inversion and specific polyembryony in armadillos. | miguel fernández was an argentinian zoologist who published the first account of obligate polyembryony in armadillos. his contribution is here discussed in relation to his contemporaries, newman and patterson, and more recent work. | 2018 | 29277272 |
| a new rictulariid (nematoda: spirurida) in xenarthrans from argentina and new morphological data of pterygodermatites ( paucipectines) chaetophracti. | pterygodermatites is a cosmopolitan genus of nematodes from mammals, and it is frequently encountered in the parasite fauna of armadillos (mammalia, xenarthra, cingulata). in this work, a new species, pterygodermatites ( paucipectines) argentinensis, is described, and new morphometric data, new host records, and the geographical distribution of pterygodermatites ( paucipectines) chaetophracti are provided. we examined 109 hosts belonging to chaetophractus vellerosus, chaetophractus villosus, cab ... | 2017 | 28783421 |
| comparative morphologic placental types in dasypodidae (chaetophractus villosus, cabassous chacoensis, tolypeutes matacus and dasypus hybridus). | information about the morphology of placentas in armadillos is scarce, except for d. novemcinctus. a comparative study of morphologic placental types in armadillos is important in order to have a comprehensive view of the peculiar reproductive physiology in this family. the aim of this paper is to perform a comparative analysis of the morphological features of the placenta in chaetophractus villosus, cabassous chacoensis, tolypeutes matacus and dasypus hybridus in order to classify them in accor ... | 2001 | 11387872 |
| synapsis, recombination, and chromatin remodeling in the xy body of armadillos. | three xenarthrans species chaetophractus villosus, chaetophractus vellerosus, and zaedyus pichiy have been used for the analysis of the structure, behavior, and immunochemical features of the xy body during pachytene. in all these species, the sex chromosomes form an xy body easily identifiable in thin sections by the special and regular packing of the chromatin fibers of the internal region of the xy body ("differential" regions) and those of the peripheral region (synaptic region). spermatocyt ... | 2012 | 22274548 |
| seasonal changes in ovarian steroid hormone concentrations in the large hairy armadillo (chaetophractus villosus) and the crying armadillo (chaetophractus vellerosus). | knowledge of armadillo reproductive physiology is essential for developing ex situ and in situ assisted reproductive techniques for propagating and/or controlling populations of these animals. the present study included assessment of fecal sex steroids by radioimmunoassay, determining reproductive status via monitoring ovarian activity (in the wild) and therefore reproductive status, in wild females of the large hairy armadillo (chaetophractus villosus) and the crying armadillo (chaetophractus v ... | 2011 | 21247625 |
| genotoxic effects of roundup full ii® on lymphocytes of chaetophractus villosus (xenarthra, mammalia): in vitro studies. | in argentina, chaetophractus villosus has a wide distribution that overlaps with agricultural areas where soybean is the predominant crop. in such areas the pesticide roundup full ii® (ru) is widely applied. the genotoxic effect of its active ingredient glyphosate (ru is 66.2% glyphosate) on the peripheral blood lymphocytes of c. villosus was tested over a range of concentrations (280, 420, 560, 1120 μmol/l). culture medium without glyphosate served as negative control, while medium containing m ... | 2017 | 28817615 |
| chaetophractus villosus as a sentinel organism: baseline values of mitotic index, chromosome aberrations and sister chromatid exchanges. | sentinel species are useful tools for studying the deleterious effects of xenobiotics on wildlife. the large hairy armadillo (chaetophractus villosus) is the most abundant and widely distributed mammal in argentina. it is a long-lived, omnivorous, burrowing species, with fairly restricted home ranges. to evaluate the level of spontaneous genetic damage in this mammal, we determined the baseline values of several genotoxicity biomarkers. the study included 20 c. villosus adults of both sexes from ... | 2016 | 26778508 |
| circannual testis changes in seasonally breeding mammals. | in the non-equatorial zones of the earth, species concentrate their reproductive effort in the more favorable season. a consequence of seasonal breeding is seasonal testis regression, which implies the depletion of the germinative epithelium, permeation of the blood-testis barrier, and reduced androgenic function. this process has been studied in a number of vertebrates, but the mechanisms controlling it are not yet well understood. apoptosis was assumed for years to be an important effector of ... | 2015 | 26375035 |
| loss of helminth species diversity in the large hairy armadillo chaetophractus villosus on the tierra del fuego island, argentina. | the aim of this work is to compare the taxonomic diversity of parasite species of the large hairy armadillo chaetophractus villosus in its native range and in another recently introduced population (tierra del fuego island), and to evaluate whether the isolation of the latter determines a decrease in its parasitic diversity. forty specimens from buenos aires and tierra del fuego provinces were collected and examined for helminths. eleven parasite species were found in the native population, and ... | 2016 | 25673233 |
| loss of sertoli-germ cell adhesion determines the rapid germ cell elimination during the seasonal regression of the seminiferous epithelium of the large hairy armadillo chaetophractus villosus. | the armadillo chaetophractus villosus is a seasonal breeder whose seminiferous epithelium undergoes rapid regression with massive germ cell loss, leaving the tubules with only sertoli cells and spermatogonia. here, we addressed the question of whether this regression entails 1) the disassembly of cell junctions (immunolocalization of nectin-3, cadm1, n-cadherin, and beta-catenin, and transmission electron microscopy [tem]); 2) apoptosis (immunolocalization of cytochrome c and caspase 3; tunel as ... | 2014 | 24451984 |
| anatomy, histology, histochemistry and fine structure of the harderian gland in the south american armadillo chaetophractus villosus (xenarthra, mammalia). | the anatomical, histological, histochemical and ultrastructural characteristics of the harderian gland of the armadillo chaetophractus villosus were described. the gland is the largest structure in the bony orbit. it is situated in the anteroventral region of the orbit. obvious structural differences are not observed between males and females. the gland is compound-branched tubulo-alveolar, being characterized by a single layer of columnar cells surrounded by myoepithelial cells. it possesses a ... | 2005 | 15883851 |
| spatial learning in south american opossums and armadillos. | this experiment compares spatial learning in the south american opossum (didelphis albiventris) and armadillo (chaetophractus villosus) in a y-maze. ss learned to turn to one arm of the maze for food reinforcement. to earn further reinforcements, they had to return to the start-box (after consuming the food) where they were restrained for a fixed intertrial interval. the number of entries to the unbaited arm en route to the goal-box (ri errors), and in the way back to the start-box (rf errors) w ... | 1984 | 6470686 |
| histology, histochemistry and fine structure of the lacrimal and nictitans gland in the south american armadillo chaetophractus villosus (xenarthra, mammalia). | the anatomical, histological, histochemical and ultrastructural characteristics of the lacrimal gland (lg) and nictitans gland (ng) of the armadillo chaetophractus villosus were described. the histochemical and histological features of both glands in male and female adult animals were compared. the tissues were processed with conventional techniques for light and transmission electron microscopy. fixed specimens were submitted to a battery of tests for glycans, glycosaminglycans, glycoconjugates ... | 2002 | 12470975 |
| ultrastructure and morphometry of ovarian follicles in the armadillo chaetophractus villosus (mammalia, dasypodidae). | ultrastructural and morphometric changes in oocyte and surrounding granulosa cells during armadillo follicular growth are described. primordial, intermediary, early and late primary, secondary, tertiary and preovulatory graafian follicles were found. from primordial to graafian follicle, granulosa cells increase in height, become multilayered while fluid-filled spaces arise among them in the tertiary follicle stage. as the follicle expands the oocyte is located eccentrically and grows in size. f ... | 2001 | 11706577 |
| absence of penile erections during paradoxical sleep. peculiar penile events during wakefulness and slow wave sleep in the armadillo. | the electroencephalogram (eeg) together with electromyogram (emg) of the ischiocavernosus, bulbocavernosus and levator penis muscles were chronically monitored across behavioral states of the armadillo chaetophractus villosus. this animal has a very long penis, which exhibits remarkable phenomena during wakefulness (w), slow wave sleep (sws) and paradoxical sleep (ps). during w it remains retracted within a skin receptacle. during sws penile protrusion can be observed together with very complex ... | 2001 | 11696075 |
| characterisation of glycoconjugate sugar residues in the vomeronasal organ of the armadillo chaetophractus villosus (mammalia, xenarthra). | conventional carbohydrate histochemistry and the binding patterns of 21 lectins were analysed to characterise the glycoconjugate content in the components of the vomeronasal organ of the armadillo chaetophractus villosus. the mucomicrovillous complex of the sensory epithelium bound most of the lectins studied. no reaction was observed with con a, psa, s-con a and sba, and the sustentacular cells were-stained with uea-i, dsl, lel, stl and con a. the vomeronasal receptor neurons were labelled with ... | 2000 | 10853958 |
| ultrastructural characterisation of the olfactory mucosa of the armadillo dasypus hybridus (dasypodidae, xenarthra). | the ultrastructure of the olfactory mucosa of the armadillo dasypus hybridus was studied. a comparison with the olfactory mucosa of another armadillo (chaetophractus villosus) was made. the olfactory mucosa of d. hybridus shows many features which are similar to those of other mammals. interestingly, it differs from the olfactory mucosa of the armadillo c. villosus. a suggestion is made that these differences may be due to differences in the digging habits of these species. in dasypus, the suppo ... | 2000 | 10739023 |
| the vomeronasal organ of the south american armadillo chaetophractus villosus (xenarthra, mammalia): anatomy, histology and ultrastructure. | the vomeronasal organ (vno) is a chemoreceptive structure that has not been extensively studied in the xenarthran order. tissue samples from the vno of the armadillo chaetophractus villosus were prepared for light and electron microscopy. the vno is located in the anterior part of the base of the nasal septum. it is tubular in shape, approximately 18 mm in length and opens in the rostral region of the nasal cavity and with a blind caudal end. its lumen is lined by sensory (se) and nonsensory (ns ... | 1999 | 10634697 |
| identification and localisation of glycoconjugates in the olfactory mucosa of the armadillo chaetophractus villosus. | conventional histochemistry and the binding patterns of 22 biotinylated lectins were examined for characterisation of glycoconjugates in the components of the olfactory mucosa of the armadillo chaetophractus villosus. the mucous lining the olfactory epithelium showed binding sites for dsl, wga, stl, lel, pha-e and jac. only the basilar processes of the supporting cells stained for con-a and s-con a. the olfactory receptor neurons stained with lel, lca, con a, s-con a, jac and pna. the layer of b ... | 1999 | 10386777 |
| olfactory mucosa of the south american armadillo chaetophractus villosus: an ultrastructural study. | the sense of olfaction in armadillos plays an important role, suggested by the great development of the nasal structures, olfactory bulbs, and related brain regions. the mammalian olfactory mucosa is a privileged site of neuronal death and regeneration during the whole life span. a detailed knowledge of its ultrastructure is convenient for gaining insight into the factors controlling those phenomena. we performed this work in species not previously studied in order to provide a firm basis for fu ... | 1998 | 9811211 |
| new and peculiar cytoplasmic membranous bodies in the acinar cells of the harderian gland of the armadillo chaetophractus villosus. | a new and peculiar morphological feature in acinar cells of the harderian gland of the south american armadillo chaetophractus villosus (mammalia, dasipodidae) is reported. the gland of adult males and females was studied at macroscopic, microscopic and electron microscopic levels. the gland is the largest structure in the bony orbit. it is located in its medial (nasal) and basal side. it shows a tubuloalveolar structure characterized by large alveoli with a single layer of columnar or cuboidal ... | 1995 | 7550576 |
| bradycardia in armadillos experimentally covered with soil. | chaetophractus villosus is able to maintain efficient respiratory movements when its nostrils are experimentally covered with soil. under these conditions, a progressive bradycardia develops. it would depend on hypothermia and asphyxia. | 1995 | 8574777 |
| decrease of body temperature in armadillos experimentally covered by soil. | the armadillo chaetophractus villosus does not stop breathing when experimentally covered with soil. under that condition, there is a gradual but considerable drop in deep rectal temperature (tb): after 90 minutes, mean +/- sd = 1.7 +/- 0.4 degrees c (n = 8). as soon as the soil is removed and the animal breathes open air, tb gradually increases. | 1995 | 8574772 |
| body temperature of the armadillo chaetophractus villosus (mammalia, dasypodidae). | body temperature of the armadillo chaetophractus villosus (n = 17) was studied during a period of 15 days. deep rectal temperature (tb) was recorded at 9 am, 1 pm and 5 pm. temperature in the laboratory was kept between 24.6 degrees c and 26.0 degrees c. we found two main different profiles of thermal behaviour in our animals, namely: a) one with high variation, mainly due to the daily cycle. b) the other with middle or low variation, with no predominance of the daily cycle. there were great tb ... | 2004 | 7849269 |
| absence of apnea in armadillos covered by soil. | the armadillo chaetophractus villosus shows a remarkable respiratory adaptation when the nostrils are completely covered by soil: it is able to maintain efficient respiratory movements with the corresponding filling of the lungs, thanks to a mechanism that allows it to use the air filling the space between the soil particles, without invasion of the nasal cavities by those particles. | 1987 | 3823659 |
| on the presence of a peculiar alpha rhythm in the olfactory tubercle of waking armadillos. | a very regular 8-12 rhythm was found in the olfactory tubercle of the armadillo chaetophractus villosus. the rhythm was observed during wakefulness. considerable sinusoidal activity was also observed not only during wakefulness, but during synchronized (slow) and desynchronized (paradoxical) sleep. the significance of this novel rhythm is discussed together with considerations that establish an important difference between it and the other 'alpha rhythms' known. | 1987 | 2431883 |
| biosynthesis of steroid hormones by testes and ovaries of the peludo, chaetophractus villosus (edentata, mammalia). | | 1972 | 4261646 |
| biosynthesis of steroids by the adrenal glands of the peludo "chaetophractus villosus", a south-american armadillo. | | 1971 | 5147121 |
| interbulbar commissural olfactory pathway: an experimental study in the armadillo chaetophractus villosus. | | 1969 | 5383544 |
| the middle ear of the pink fairy armadillo chlamyphorus truncatus (xenarthra, cingulata, chlamyphoridae): comparison with armadillo relatives using computed tomography. | the pink fairy armadillo chlamyphorus truncatus is the smallest extant armadillo and one of the least-known fossorial mammals. the aim of this study was to establish if its middle ear is specially adapted to the subterranean environment, through comparison with more epigeic relatives of the groups euphractinae (chaetophractus villosus, chaetophractus vellerosus, zaedyus pichiy) and dasypodinae (dasypus hybridus). we examined the middle ears using micro-computed tomography and subsequent three-di ... | 2020 | 31997377 |
| forelimb myology of armadillos (xenarthra: cingulata, chlamyphoridae): anatomical correlates with fossorial ability. | descriptions of myology reflect adaptations of the post-cranium and are essential for understanding the functional morphology of animal limbs. armadillos (cingulata) are the most species-rich group of the basal superorder xenarthra, which is evident by their various lifestyles (subterranean vs. terrestrial) and levels of fossoriality (fossorial vs. semi-fossorial). while there have been several studies on limb bone proportions in numerous armadillos, limb myology has been reported for a limited ... | 2020 | 33111984 |
| a review on trichinella infection in south america. | trichinella spp. causes human trichinellosis by means of the consumption of raw or inadequately treated meat from domestic or game animals. in the americas, as well as in other continents, trichinella infection is a health issue for humans and has a negative impact on the pork meat market, generated by people's fear of becoming infected with the parasite. the distribution of human cases and the sources of this disease in humans and animals were analysed in this report, which summarizes the infor ... | 2020 | 32949838 |
| trichinella spiralis in a south american sea lion (otaria flavescens) from patagonia, argentina. | trichinella spp. from a sylvatic cycle has been found in several animal species such as pumas (puma concolor), armadillos (chaetophractus villosus), rats (rattus norvegicus), and wild boars (sus scrofa) in argentina. moreover, trichinella infection has been detected in a wide range of marine mammals around the world, including polar bears (ursus maritimus) and walruses (odobenus rosmarus). until the present time, trichinella spp. infection has not been detected in marine mammals of south america ... | 2018 | 30334078 |
| hypervitaminosis d in a giant anteater (myrmecophaga tridactyla) and a large hairy armadillo (chaetophractus villosus) receiving a commercial insectivore diet. | hypervitaminosis d was diagnosed in a giant anteater (myromecophaga tridactyla) and a large hairy armadillo (chaetophractus villosus) being fed a commercial insectivore diet. clinical findings included weight loss, reduced appetite, vomiting, and suspected abdominal discomfort. hypercalcemia (3.68 and 2.04 mmol/l total and ionized calcium, respectively) was detected in the anteater, and plasma 25(oh)d levels were measured and found to be 808.7 and 379.4 nmol/l for the anteater and armadillo, res ... | 2020 | 32212572 |
| germ cell cysts, a fetal feature in mammals, are constitutively present in the adult armadillo. | formation and subsequent break down of ovarian germ cell (gc) cysts is a key and an evolutionary-conserved developmental event, described in phylogenetically diverse species of invertebrates and vertebrates. in mammals, cyst break down (cbd) ends at the time of, or soon after, birth with the formation of primordial follicles enclosing single oocytes, which constitute the sole reservoir of gametes available through the whole female's reproductive life. in this study, we challenge this paradigm de ... | 2020 | 31749232 |
| sertoli-immature spermatids disengagement during testis regression in the armadillo. | in nature, mammalian seasonal breeders undergo spermatogenetic arrest during the non-breeding season. in the large hairy armadillo chaetophractus villosus, testis regression initiates with immature post-meiotic germ cells sloughing into the tubule lumen and continues with the death of the remaining spermatocytes. at the end of the regression period, only spermatogonia and sertoli cells persist in the seminiferous epithelium. it has been suggested that cell sloughing is determined by changes in t ... | 2019 | 30394707 |
| cytogenetic damage in peripheral blood cultures of chaetophractus villosus exposed in vivo to a glyphosate formulation (roundup). | different concentrations of a glyphosate formulation, roundup® full ii (66.2% glyphosate) were tested in culture peripheral blood of armadillo chaetophractus villosus with cytogenetic biomarkers like mitotic index (mi), chromosomal aberrations (ca), sister chromatid exchange (sce) and cell proliferation kinetics (cpk) by means of replication index. adults animals of both sexes were exposed to ru at four concentrations ranging from 0.026 ml ru solution to 0.379 ml ru daily in oral treatment with ... | 2018 | 29614449 |