Publications

spino-cerebellar fibers of the opossum didelphis marsupialis virginiana.		1971	5289710
the dentition of a 25-day pouch-young specimen of didelphis virginiana (didelphidae: marsupialia).		1967	5233942
the contribution of the dorsal lateral geniculate nucleus to the total pattern of thalamic terminations in striate cortex of the virginia opossum.		1971	5148973
the red nucleus of the opossum (didelphis marsupialis virginiana): a light and electron microscopic study.		1971	5148971
the habituation of auditory reflexes in the decorticate opossum (didelphis virginiana).		1971	5148514
experimental bacterial endocarditis in the opossum (didelphis virginiana). 3. comparison of spontaneously occurring endocarditis with that induced experimentally by pyogenic bacteria and fungi.	it was possible to induce bacterial endocarditis in opossums with single intravenous injections of streptococcus viridans or staphylococcus aureus. fiftyeight percent of those animals given streptococcus viridans developed bacterial endocarditis in which most of the lesions were on the left side of the heart. the experimentally induced streptococcal disease was similar to that which may occur spontaneously in opossums, both with respect to the distribution and structure of the vegetations. singl ...	1971	5133514
experimental talipes in the virginia opossum.		2005	5133035
didelphonema longispiculata (hill, 1939) wolfgang, 1953 (nematoda: spiruroidea) and other helminths from the opossum (didelphis marsupialis virginiana) in georgia.		1971	5090983
central distribution of primary afferent fibers of the glossopharyngeal and vagal nerves in the opossum, didelphis virginiana.		1972	5075701
spino-bulbar, spino-thalamic and medical lemniscal connections in the american opossum, didelphis marsupialis virginiana.		2016	5071890
development of pulmonary reflexes and pattern of breathing in virginia opossum.		1972	5063396
contribution of neocortex to sound localization in opossum (didelphis virginiana).		1972	5029954
a light and electron microscopic study of corticorubral projections in the opossum, didelphis marsupialis virginiana.		1972	5028528
development of the chemical control of breathing in the virginia opossum.		1972	5024173
a stereotaxic atlas of the opossum brain (didelphis virginiana).		1971	4950276
morphology of neuroglia in the hypothalamus of the opossum (didelphis virginiana), armadillo (dasypus novemcinctus mexicanus) and cat (felis domestica).		1971	4944389
a stereotaxic atlas of the opossum brain (didelphis virginiana).		1971	4940387
a review of the anatomy and neurophysiology of the opossum (didelphis virginiana) visual system.		1969	4894785
the distribution and control of osmosensitive cells within the hypothalamus of the opossum (didelphis virginiana).		1969	4889623
visual receptive fields from cells of a marsupial (didelphis virginiana) superior colliculus.		1968	4881348
ovariectomy during gestation in the american opossum, didelphis marsupialis virginiana.		1974	4853513
eimeria indianensis sp. n. and an isospora sp. from the opossum didelphis virginiana (kerr).		1974	4817974
induction of a chronic somatosensory epilepsy in the opossum (didelphis virginiana kerr) with an inhibitor of cholesterol biosynthesis.		1973	4798641
the motor nucleus of the facial nerve in the opossum (didelphis marsupialis virginiana). its organization and connections.		1973	4784296
the postnatal development of the liver in a marsupial, didelphis virginiana. 1. light microscopy.		1973	4762131
methylcholanthrene carcinogenesis in the north american opossum (didelphis virginiana).		1973	4745856
diel temperature fluctuations of the virginia opossum (didelphis virginiana).		1973	4744938
the adrenergic control of lower esophageal sphincter function. an experimental model of denervation supersensitivity.	to evaluate the adrenergic regulation of lower esophageal sphincter (les) function, les pressure, les relaxation during swallowing, and blood pressure were measured in the anesthetized opossum, didelphis virginiana, during intravenous administration of alpha and beta adrenergic agonists and antagonists. studies were done in controls and animals adrenergically denervated with 6-hydroxydopamine. alpha adrenergic agonists (norepinephrine, phenylephrine) increased les pressure and blood pressure, wh ...	1973	4727458
distribution of cerebellar and somatic lemniscal projections in the ventral nuclear complex of the virginia opossum.		1973	4709264
cell cycle determination of phytohemagglutinin-stimulated lymphocytes from the opossum, didelphis virginiana.		1973	4708350
somatotopic organization related to nuclear morphology in the cuneate-gracile complex of opossums didelphis marsupialis virginiana.		1973	4706006
an experimental light and electron microscopic study of cerebellorubral projections in the opossum, didelphis marsupialis virginiana.		1973	4700724
convergent projection of three separate thalamic nuclei on to a single cortical area.	three distinct sensory-motor nuclei in the thalamus project to parietal cortex in the virginia opossum; the ventral posterior nucleus receives inputs from somatic sensory structures and projects to layers iv and iii, the ventral anterolateral nucleus receives inputs from motor structures and projects to layers iv and iii and inner i, and the central intralaminar nucleus receives inputs from sensory, motor, and other structures and projects to layers vi through outer i. the physiologically define ...	1973	4683125
interpretation of sex chromosomal rna synthesis in the opossum, didelphis virginiana.		1972	4653583
effects of incubation temperature on the kinetics of cultured lymphocytes from the opossum, didelphis virginiana.		1974	4435132
pasteurella multocida infection in the opossum (didelphis virginiana).		1974	4374598
proceedings: control of steroidogenesis in adrenal tissue from the developing opossum, didelphis marsupialis virginiana.		1974	4374480
the erythrocyte life span in the american opossum (didelphis marsupialis virginiana).		1974	4365338
the opossum (didelphis virginiana kerr) as a biomedical model. 3. breeding the opossum in captivity: methods.		2015	4362895
the opossum (didelphis virginiana kerr) as a biomedical model. ii. breeding the opossum in captivity: facility design.		1974	4362894
the opposum (didelphis virginiana kerr) as a biomedical model. i. research perspective, husbandry, and laboratory technics.		1974	4362893
basal-cell tumor in a virginia opossum (didelphis marsupialis).		1973	4351486
characteristics of common helminths of the virginia opossum (didelphis virginiana) from north carolina.		1972	4336985
administration of test materials to the neonatal north american opossum (didelphys marsupialis virginiana kerr).		1971	4329243
sedation and anesthesia of the virginia opossum, didelphis virginiana.		1971	4329235
experimental study of pulmonary adenomas in the opossum (didelphis virginiana).		1971	4325695
pulmonary adenomatosis in opossums (didelphis virginiana).		1969	4310335
fine structure of the prostatic epithelium of the opossum (didelphis virginiana kerr).		1965	4287015
the opossum, didelphis virginiana, as a laboratory animal.		1969	4240729
blood chemical and hematological studies in the laboratory-confined, unanesthetized opossum, didelphis virginiana.		1969	4240125
the basilar pontine gray of the opossum (didelphis virginiana). i. morphology.		1968	4185130
the immunologic responses of the north american opossum (didelphys virginiana).		1968	4177528
hematologic parameters of the opossum (didelphis virginiana).		2014	4145239
acquired immunity in opossum (didelphis virginiana) embryos.		1974	4133078
thalmocortical projections from the mediodorsal nucleus in the virginia opossum.		1973	4121726
reticulospinal fibers of the opossum, didelphis virginiana. ii. course, caudal extent and distribution.		1971	4101680
reticulospinal fibers of the opossum, didelphis virginiana. i. origin.		1971	4101679
quantitative distribution of enteroendocrine cells in the gastrointestinal tract of the adult opossum, didelphis virginiana.	the distribution and quantification of enteroendocrine cells exhibiting immunoreactivities to nine peptides and one amine were examined in the gastrointestinal mucosa of the adult opossum using specific immunocytochemical methods. in the stomach, 90% of the enteroendocrine cells are confined to the pyloric glands and this region contained 73% of the gastrin-containing cells, 60% of the somatostatin-containing cells and 9% of cells reactive for 5-ht. enteroendocrine cells showing immunoreactiviti ...	1985	4077699
corticospinal development in the north-american opossum: evidence for a sequence in the growth of cortical axons in the spinal cord and for transient projections.	the course and distribution of corticospinal axons have been traced in a series of pouch young and adult opossums using wheat germ agglutinin conjugated to horseradish peroxidase (wga-hrp). cortical axons enter the spinal cord approx. 28 days after birth (40 days after conception) and, at that time, are limited to those portions of the dorsal and lateral funiculi which contain them in the adult animal. shortly thereafter, cortical axons are also found in regions of presumptive white matter where ...	1985	4075107
the distribution of photoreceptors, dopaminergic amacrine cells and ganglion cells in the retina of the north american opossum (didelphis virginiana).	quantitative light microscopic techniques have been applied to photoreceptors, ganglion cells and dopaminergic amacrine cells in the retina of the north american opossum didelphis virginiana. this marsupial has a retina with a central areal specialization where ganglion cells reach a maximum density of 2900/mm2 and cone photoreceptors are concentrated. however, the retina is very much rod dominated and there is a ring of peak rod density approximately 2 mm around the area centralis (a.c.). at th ...	1985	4072000
placentation in the opossum, didelphis virginiana.	for the first 9 days of gestation, opossum embryos float in uterine secretions, separated from maternal tissues by a shell membrane. each embryo is part of the wall of its hollow embryonic sphere. by the 10th day of development, the embryo becomes enveloped by both the amnion and yolk-sac. the yolk-sac consists of vascular and non-vascular portions and, together with the surrounding trophectoderm (trophoblast), forms the yolk-sac placenta of the opossum: the allantois does not contribute to form ...	1985	4061035
responses of opossum and rat hippocampal ca1 cells to paired stimulus volleys.	short-term synaptic plasticity was studied in the in vitro hippocampus of the north american opossum (didelphis virginiana) and rat (rattus norvegicus). conditioning and test stimulus pulses were delivered to fibers in stratum radiatum, and intracellular and extracellular recordings were obtained from area ca1 pyramidal cells. in rat, the amplitude of the population spike in response to the second (test) of two stimulus impulses is suppressed at short inter-pulse-intervals (ipi's). in opossum, t ...	1985	4052826
experimental la crosse virus infection of red fox (vulpes fulva), raccoon (procyon lotor), opossum (didelphis virginiana), and woodchuck (marmota monax).	susceptibility to infection, resulting viremia and antibody responses, and potential to provide infectious blood meals for aedes triseriatus were determined and compared for the red fox (vulpes fulva), raccoon (procyon lotor), and opossum (didelphis virginiana) exposed to la crosse (lac) virus transmitted by mosquitoes, ae. triseriatus. woodchucks (marmota monax) were infected with lac virus by needle and syringe. all 5 red foxes became viremic following the bite of a single lac virus-infected f ...	1985	4003669
experimental studies of st. louis encephalitis virus in vertebrates.	serologically negative birds and mammals of species, known from other studies to be exposed naturally to st. louis encephalitis (sle) virus in memphis, tennessee, and other selected species were inoculated experimentally with strains of sle virus to determine their potential as natural hosts. mosquitoes (culex sp.) were allowed to feed on some of the inoculated vertebrate species, held for 14 days, and tested for sle infection. the cardinals (richmondena cardinalis), robins (turdus migratorius), ...	1985	3999258
the allantois of the north american opossum (didelphis virginiana) with preliminary observations on the yolk sac endoderm and trophectoderm.	during the middle of prenatal day 10, the opossum allantois forms as a ventral outgrowth of the hindgut. by day 11 it appears as a large, fluid filled sac and by the middle of day 12 (just prior to birth) it reaches its maximal development. the simple squamous epithelium lining the allantois consists of only one cell type that often contains numerous filaments in the apical cytoplasm. at the luminal surface, the apices of the cells are united by junctional complexes and desmosomes are present be ...	1985	3977085
electrical properties of smooth muscle cell membrane of opossum esophagus.	the electrical properties of the circular smooth muscle layer from the north american opossum esophagus (body) were studied in vitro by microelectrode recording techniques, both at rest and during stimulation of intramural inhibitory nerves. all observations were made at 37 degrees c in an abe-tomita partitioned bath on muscle strips dissected 2 cm orad of the lower esophageal sphincter. at rest, the potential of the smooth muscle cell membrane was -49 +/- 4 mv (mean +/- se); the length constant ...	1985	3976893
the synthesis and metabolism of gonadal steroids in pouch young of the opossum, didelphis virginiana.	we have measured steroid hormone biosynthesis from pregnenolone in ovaries and testes, aromatization of testosterone in gonads and peripheral tissues, and 5 alpha-reduction of testosterone in peripheral tissues of developing opossum pouch young. sex of the newborn opossums is discernible grossly with development of the pouch in females and the scrotum in males approximately 10 days after birth. differentiated endocrine function of ovaries and testes was demonstrable as soon as development of the ...	1985	3971901
brucella abortus in wildlife on selected cattle farms in alabama.	two studies of brucellosis in wildlife on farms where the brucellosis infection prevalence in cattle was known are reported. on a research farm, 233 feral animals of 22 mammalian species and 12 of seven avian species were trapped during three time periods. sixty were studied before cattle were introduced, 128 were studied while 501 cattle infected with brucella abortus were calving and aborting, and 60 specimens were collected 20 mo after the last infected cow calved. selected tissues from 229 w ...	1985	3923213
beta-like ganglion cells in the retina of the north american opossum.	injection of horseradish peroxidase into the severed optic tract or nerve of the opossum retrogradely filled retinal ganglion cells. an abundance of well-labeled ganglion cells had dendritic morphology closely resembling that of beta-type ganglion cells in the cat retina. this finding suggests that an x-like functional class of ganglion cells is prominent in the retina of the opossum.	1985	3921195
serotonergic innervation of the forebrain in the north american opossum.	the forebrain distribution of axons showing serotonin-like immunoreactivity was studied in the north american opossum. serotonergic innervation of the hypothalamus was extensive, particularly within the ventromedial nucleus, the periventricular nucleus and the rostral supraoptic nucleus. serotonergic axons were also present within the fields of forel and zona incerta, but they tended to avoid parts of the subthalamic nucleus. in the thalamus serotonergic innervation was dense within the midline ...	1985	3910165
the sensory innervation of the nasal glabrous skin in the short-nosed bandicoot (isoodon macrourus) and the opossum (didelphis virginiana).	the glabrous skin at the anterior end of the snout of the short-nosed bandicoot and the american opossum was investigated by electron microscopy. in both species of animals, this region was lined by skin with broad epidermal pegs, innervated by three types of intraepidermal nerves. these were intraepidermal nerves which penetrated the epidermis up to the level of the stratum spinosum or the stratum granulosum, intraepidermal nerves in the basal layer of the epidermis partially surrounded by schw ...	1985	3870723
tactile cutaneous representation in cerebellar granule cell layer of the opossum, didelphis virginiana.	recent studies of the albino rat revealed extensive cutaneous somatosensory projections to the granule cell (gc) layer of the cerebellar hemispheres and the caudal vermis. these projections are organized asomatotopically in patchy mosaics. to determine whether similar projections exist in a marsupial, we explored the gc layer of the cerebellar cortex of anesthetized virginia opossums using in-depth microelectrode micromapping and juxtathreshold cutaneous natural stimulation techniques. we found: ...	1985	3843070
cortical projections to superficial laminae of the dorsal horn and to the ventral horn of the spinal cord in the north american opossum. studies using the orthograde transport of wga-hrp.	the orthograde transport of horseradish peroxidase conjugated to wheat germ agglutinin (wga-hrp) has been used to study the distribution of corticospinal axons in adult and pouch-young opossums. as predicted from the results of degeneration and autoradiographic experiments, injections of wga-hrp into limb areas of somatic motor-sensory cortex labeled axons in the dorsal and lateral funiculi of the cervical and upper thoracic spinal cord which could be traced to dense terminal zones in laminae ii ...	1985	3839153
the development of commissural connections of somatic motor-sensory areas of neocortex in the north american opossum.	the north american opossum does not have a corpus callosum; neocortical commissural axons are contained entirely within the anterior commissure. we have used axonal transport techniques to study the origin and distribution of commissural axons from somatic motor-sensory cortex in developing and adult opossums. neocortical axons grow into the anterior commissure by postnatal day (pnd) 12, the contralateral external capsule by approximately pnd 19, the area deep to the contralateral homotypic cort ...	1985	3838629
the nonmammalian-mammalian transition through neurohypophysial peptides.	neurohypophysial hormones are particularly proper evolutionary tracers. whereas eutherian mammals have oxytocin and virtually always arginine vasopressin, nonmammalian tetrapods possess instead mesotocin and vasotocin. the transitions of mesotocin-oxytocin and vasotocin-vasopressin involved in the passage of reptiles-mammals seem to have occurred independently. australian marsupials are endowed with mesotocin but american marsupials have either oxytocin (south-american opossums) or both oxytocin ...	1985	3831965
the adult organization and development of the rubrospinal tract. an experimental study using the orthograde transport of wga-hrp in the north-american opossum.	we have employed the orthograde transport of wheat germ agglutinin conjugated to horseradish peroxidase to study the organization of rubrospinal connections in adult and pouch young opossums. our results suggest that: in the adult opossum rubrospinal axons are distributed more widely than suggested by previous studies; rubrospinal projections are formed postnatally in the opossum, but much earlier than corticospinal connections; rubrospinal axons do not grow synchronously, as a massive bundle fo ...	1986	3779426
a plastic cage for restraint of the opossum (didelphis virginiana).		1986	3773475
efferent projections of the basolateral amygdala in the opossum, didelphis virginiana.	the autoradiographic anterograde axonal transport technique was used to study efferent projections of the opossum basolateral amygdala. all nuclei of the basolateral amygdala send topographically organized fibers to the bed nucleus of the stria terminalis (bst) via the stria terminalis (st). injections into rostrolateral portions of the basal nuclei label fibers that surround the commissural bundle of the st, cross the midline by passing along the outer aspect of the anterior commissure, and ter ...	2011	3768738
isolation of antihemorrhagic factors in opossum (didelphis virginiana) serum using a monoclonal antibody immunoadsorbent.	the antihemorrhagic factor in opossum (didelphis virginiana) serum isolated by sephadex g-200 gel filtration and deae a-50 ion exchange chromatography was used as antigen to immunize balb/c mice. hybrid cell lines secreting monoclonal antibodies against antihemorrhagic factor were produced by fusion of sp2/0 myeloma cells with spleen cells of the immunized mice. the ascites fluid was produced in balb/c mice. the monoclonal antibody in the ascites fluid was partially purified by deae a-50 ion exc ...	1986	3750345
mechanical factors in the evolution of the mammalian secondary palate: a theoretical analysis.	the secondary palate of mammals is a bony shelf that closes the ventral aspect of the rostrum. the rostrum, therefore, approximates to a tapered semicylindrical tube that is theoretically a mechanically efficient structure for resisting the forces of biting, including the more prolonged bouts of mastication typical of mammals. certain mammal-like reptiles illustrate stages in the development of the palate in which the shelves projecting medially from each premaxilla and maxilla do not meet in th ...	1986	3746918
the development and migration of large multipolar neurons into the cochlear nucleus of the north american opossum.	we have studied the maturation of the inferior colliculus and cochlear nuclei of the north american opossum with particular emphasis on the large multipolar neurons of the cochlear nucleus. these neurons include the principal and giant cells of the dorsal cochlear nucleus (dcn) and the large neurons of the ventral cochlear nucleus (vcn), all of which can be labelled by horseradish peroxidase (hrp) injections into the contralateral inferior colliculus (ic). the size of these neurons, their charac ...	1986	3722450
unique regional distribution of delta 4-3-ketosteroid-5 alpha-oxidoreductase and associated epididymal morphology in the marsupial, didelphis virginiana.	the epididymal epithelial ultrastructure has been described in the adult male north american opossum, didelphis virginiana. morphological results have suggested that absorptive activity is prominent in the proximal epididymal region by virtue of numerous microvilli, an endocytotic complex, dense granules, and multivesicular bodies in the apical cytoplasm. in contrast, the middle and distal epididymal regions exhibit ultrastructural features indicative of protein synthesis such as large invaginat ...	2013	3676395
lyme disease ecology in wisconsin: distribution and host preferences of ixodes dammini, and prevalence of antibody to borrelia burgdorferi in small mammals.	lyme disease recently has been recognized in wisconsin. trapping studies were conducted at four geographically separate and ecologically distinct regions in wisconsin to elucidate the distribution and host preferences of ixodes dammini on small and medium sized mammals, and the occurrence of antibodies to borrelia burgdorferi in these wild mammals. peak i. dammini larval activity occurred from june-september. nymphs were most active from may-august. white-footed mice (peromyscus leucopus) and ch ...	1987	3605501
x-linked gene expression in the virginia opossum: differences between the paternally derived gpd and pgk-a loci.	expression of x-linked glucose-6-phosphate dehydrogenase (g6pd) and phosphoglycerate kinase-a (pgk-a) in the virginia opossum (didelphis virginiana) was studied electrophoretically in animals from natural populations and those produced through controlled laboratory crosses. blood from most of the wild animals exhibited a common single-banded phenotype for both enzymes. rare variant animals, regardless of sex, exhibited single-banded phenotypes different in mobility from the common mobility class ...	1987	3557111
dna methylation stabilizes x chromosome inactivation in eutherians but not in marsupials: evidence for multistep maintenance of mammalian x dosage compensation.	in marsupials and eutherian mammals, x chromosome dosage compensation is achieved by inactivating one x chromosome in female cells; however, in marsupials, the inactive x chromosomes is always paternal, and some genes on the chromosome are partially expressed. to define the role of dna methylation in maintenance of x chromosome inactivity, we examined loci for glucose-6-phosphate dehydrogenase and hypoxanthine phosphoribosyltransferase in a north american marsupial, the opossum didelphis virgini ...	1987	3476942
characterization of erysipelothrix rhusiopathiae isolated from an opossum (didelphis virginiana) with septicemia.	erysipelothrix rhusiopathiae was isolated from a wild-caught opossum (didelphis virginiana). the opossum was quarantined in isolation and removed from contact with other animals. after a 2-mo period it was found dead in its cage, and presented for postmortem examination. pure cultures of erysipelothrix rhusiopathiae (slu isolate) were recovered from heart blood, liver, spleen and lungs. to compare pathogenicity, an experimental infection was attempted in cf1 mice with a single dose of 1.5 x 10(7 ...	1988	3411715
dual duplication of neurohypophysial hormones in an australian marsupial: mesotocin, oxytocin, lysine vasopressin and arginine vasopressin in a single gland of the northern bandicoot (isoodon macrourus).	neurohypophysial hormones of an australian marsupial, the northern bandicoot (isoodon macrourus), have been identified by their retention times in high-pressure reverse-phase liquid chromatography using two solvent systems and by their molar pressor or uterotonic activities. two pressor peptides, arginine vasopressin and lysipressin, and two uterotonic peptides, mesotocin and oxytocin, have been characterized. because mesotocin and arginine vasopressin have been identified in three other austral ...	1988	3395337
the origin of projections from the medullary reticular formation to the spinal cord, the diencephalon and the cerebellum at different stages of development in the north american opossum: studies using single and double labeling techniques.	we have employed the retrograde transport of horseradish peroxidase alone or conjugated to wheat germ agglutinin, to label neurons within the medullary reticular formation which project to the spinal cord, the diencephalon and the cerebellum at different stages of development in the north american opossum. at selected ages, the fluorescent markers fast blue and diamidino yellow were also used in double-labeling experiments to determine if single neurons innervate both the spinal cord and diencep ...	1988	3393288
the development of selected rubral connections in the north american opossum.	we have employed axonal transport and degeneration techniques to study the development of selected rubral connections in the north american opossum. opossums were chosen for study because they are born in an immature state, 12 days after conception, and have a lengthy postnatal development. the results of our studies suggest that: (1) the red nucleus innervates the spinal cord early in development, but not as early as some areas of the brainstem; (2) rubrospinal development occurs postnatally in ...	2007	3382514
evidence for developmental plasticity of the rubrospinal tract. studies using the north american opossum.	using axonal tracing techniques we have shown that rubral axons are capable of growing around lesions of the rubrospinal tract during early stages of development in the north american opossum and that a critical period for such growth exists. the opossum was employed for study because it is born in a very immature state 12-13 days after conception and the entire development of its rubrospinal tract occurs postnatally.	1988	3378179
evolutionary and developmental aspects of two hemoglobin beta-chain genes (epsilon m and beta m) of opossum.	a series of gene duplications that began in a stem species of mammalia and led to five developmentally regulated hemoglobin beta-chain loci (epsilon, gamma, eta, delta, and beta) in a common ancestor of eutherian orders artiodactyla, rodentia, lagomorpha, and primates had important consequences in mammalian evolution. findings reported here indicate that two progenitors of the five linked genes existed by the time of the eutherian (placental mammal)-metatherian (marsupial mammal) split and that ...	1988	3375246
valvular endocarditis associated with experimental erysipelothrix rhusiopathiae infection in the opossum (didelphis virginiana).	intravenous inoculation of a wild type isolate of erysipelothrix rhusiopathiae in opossums resulted in valvular endocarditis in all infected animals. opossums were inoculated once a week for 3 weeks. lesions became visible with cardiac ultrasound by week four post-inoculation. opossums remained clinically normal throughout the experiment, and preinfection body weight was maintained. other lesions of chronic erysipelas including skin necrosis and arthritis were not found in infected opossums.	1988	3374091
endogenous lipid pneumonia in opossums from louisiana.	endogenous lipid pneumonia was present in 19 of 27 opossums (didelphis virginiana) trapped in the vicinity of baton rouge, louisiana. the severity of lesions varied from small pleural and subpleural aggregates of foamy macrophages with minimal disruption of pulmonary architecture to large nodular accumulations of foam cells with cholesterol clefts and localized emphysema. the cause of the lipid pneumonia may be related to pulmonary nematode parasite infections, which were evident in 13 of the af ...	2012	3373627
experimental cryptosporidium parvum infections in opossums (didelphis virginiana).	five nursing opossums (didelphis virginiana) were each inoculated with 5 x 10(6) cryptosporidium parvum oocysts of calf origin. following inoculation, endogenous stages of c. parvum were observed in the ileum, cecum, and colon of these opossums. two of three noninoculated pouch mates acquired infections during the study based on examinations of feces and tissue sections of all eight opossums. mild diarrhea was observed in four of seven opossums harboring c. parvum, although none died as a result ...	1988	3352085
localization of g6pd and hprt to different arms of the x chromosome of the north american marsupial (didelphis virginiana) by in situ hybridization and deletion mapping: evolutionary significance.	we have mapped hprt and g6pd loci on the x chromosome in the american opossum, didelphis virginiana, by in situ hybridization to cells derived from two females by using genomic opossum dna as probes. the localizations (g6pd to xp13 and hprt to xq21), indicating that the two genes are separated by the centromere, were confirmed by results of hybridization to x chromosomes with deletions that include the hprt locus and opossum-mouse cell hybrids containing the relevant fragment of the opossum x ch ...	1988	3243545
induced renal dysplasia in the young pouch opossum.	using the north american opossum, didelphis virginiana, we have developed a new model for studying the effects of early fetal urinary obstruction on subsequent renal development. we have successfully induced renal dysplasia in the marsupial that has a typically mammalian kidney.	2011	3236178
development of the optic nerve of the opossum (didelphis virginiana).	the development of the optic nerve of a marsupial, the north american opossum, was examined in 24 animals from postnatal days 5 to 78 (p5-p78): gestation is 13 days. the estimated number of axons increased from 24,000 at p5, to 267,000 at p27, approximately 2.7 times the mean number in the adult. following p27, axon numbers decreased rapidly to 140,000 at p40, then decreased more slowly, attaining adult values between p50 and p59. thus, the opossum is similar to placental mammals examined in evi ...	1988	3233732
differential distribution of the p1 and p2 protamine gene sequences in eutherian and marsupial mammals and a monotreme.	at the protein level, the p1 protamine is the predominant form of mammalian protamine, present in all mammalian spermatozoa analyzed to date. an additional variant, the p2 protamine, has been detected only in spermatozoa of the mouse, hamster and human. southern blot analysis of a group of restriction enzyme-digested mammalian dnas has revealed the presence of sequences homologous to the p1 and p2 mouse protamine genes in diverse species. in agreement with protein studies, nucleotide sequences h ...	1988	3209180
trichinella spiralis in an agricultural ecosystem. iii. epidemiological investigations of trichinella spiralis in resident wild and feral animals.	as part of a larger epidemiological study examining the transmission of trichinella spiralis in an agricultural ecosystem, resident wild and feral animals were trapped to determine the extent of their involvement in the natural, on-farm cycling of the parasite among swine. during a 21-mo-study, seven of 15 skunks (mephitis mephitis), one of three opossums (didelphis virginiana), two of two feral domestic cats and a raccoon (procyon lotor) were found to be infected, while five shrews (blarina bre ...	1988	3193554
structure, processing and evolution of the neurohypophysial hormone-neurophysin precursors.	neurohypophysial hormones and neurophysins are derived from common precursors processed during the axonal transport from the hypothalamus to the neurohypophysis. two neurohormones, an oxytocin-like and a vasopressin-like, on one hand, two neurophysins, termed vldv-and msel-neurophysins according to residues in positions 2, 3, 6 and 7, on the other, are usually found in vertebrate species. in contrast to placental mammals that have oxytocin and arginine vasopressin, marsupials have undergone a pe ...	1988	3147712