Publications
| Title | Abstract | Year Filter | PMID(sorted descending) Filter |
|---|
| haematology and blood chemistry in free-ranging quokkas (setonix brachyurus): reference intervals and assessing the effects of site, sampling time, and infectious agents. | quokkas (setonix brachyurus) are small macropodid marsupials from western australia, which are identified as of conservation concern. studies on their blood analytes exist but involve small sample sizes and are associated with very little information concerning the health of the animals. blood was collected from free-ranging quokkas from rottnest island (n = 113) and mainland (n = 37) western australia, between september 2010 and december 2011, to establish haematology and blood chemistry refere ... | 2020 | 32941511 |
| isolation of cryptococcus neoformans var. grubii (serotype a) and c. magnus from the nasal lining of free-ranging quokkas (setonix brachyurus). | cryptococcus species are environmental yeasts, with a worldwide distribution and remarkable environmental adaptation. although many species do not cause disease, c. neoformans and c. gattii are causative agents of cryptococcosis, a life threatening infection and a significant public health problem worldwide. infection especially affects immunocompromised animals and humans. in wildlife, cryptococcosis appears to be more prevalent in captive populations. the objective of this study was to assess ... | 2020 | 32935332 |
| salmonella in free-ranging quokkas (setonix brachyurus) from rottnest island and the mainland of western australia. | salmonella is a genus of gram-negative, motile, and facultative anaerobic bacteria with a worldwide distribution that contaminates multiple substrates (vegetation, food, soil, and water) and inhabits the gastrointestinal tract of birds, reptiles, and mammals, including humans. rottnest island is a popular tourist destination and is abundantly inhabited by quokkas (setonix brachyurus), a charismatic small wallaby. current data on the association between salmonella and quokkas on rottnest island a ... | 2020 | 32244325 |
| genetic variation in austrostrongylus thylogale johnston & mawson, 1940 (nematoda: trichostrongylida) from the tammar wallaby, notamacropus eugenii (gray), and the quokka, setonix brachyurus (quoy & gaimard) (marsupialia: macropodidae) in australia. | australian marsupials harbour a diverse array of helminth parasites. despite current attempts to assess the extent of this diversity in macropodid hosts, it has been suggested that unique parasite fauna of australian wildlife is difficult to document comprehensively due to the common occurrence of cryptic species. this paper assessed genetic variation within austrostrongylus thylogale johnston & mawson, 1940 from the tammar wallaby, notamacropus eugenii (gray), and the quokka, setonix brachyurus ... | 2020 | 32171333 |
| eimeria tamimi sp. n. (apicomplexa: eimeriidae) from the rock hyrax (procavia capensis jayakari) in central saudi arabia. | faecal samples from the rock hyrax (procavia capensis jayakari thomas) were collected from the ibex reserve in central saudi arabia. eimerian oocysts, which are believed to represent a new species described here as eimeria tamimi sp. n., were detected in 40 out of 93 samples. oocysts were fully sporulated in 24-48 hours at 25 ± 2 °c. sporulated oocysts of e. tamimi sp. n. were ovoid, measuring 35-42 × 19-25 μm (39 × 23 μm), a length/width ratio 1.5-2 (1.7). oocyst wall was bilayered and measured ... | 2020 | 32075950 |
| sequence analyses at mitochondrial and nuclear loci reveal a novel theileria sp. and aid in the phylogenetic resolution of piroplasms from australian marsupials and ticks. | the order piroplasmida encompasses two main families: babesiidae and theileriidae, containing tick-borne pathogens of veterinary and medical importance worldwide. while only three genera (babesia, cytauxzoon and theileria) comprising piroplasm parasites are currently recognised, phylogenetic studies at the 18s rrna (18s) gene suggest that these organisms represent at least ten lineages, one of which comprises the relatively unique and highly diverse theileria spp. from australian marsupials and ... | 2019 | 31851687 |
| new species and new records of species of cloacina von linstow, 1898 (nematoda: strongylida) parasitic in the western scrub wallaby, notamacropus irma (jourdan) (marsupialia: macropodidae) from western australia. | the helminth parasites of the western scrub wallaby or black-glove wallaby, notamacropus irma (jourdan) which occurs in western australia are relatively poorly documented. six new species of the strongyloid genus cloacina von linstow, 1898 (strongylida: chabertiidae) are described namely c. asymmetrica n. sp., c. brazellei n. sp., c. harriganae n. sp., c. hobbsi n. sp., c. middletoni n. sp. and c. woodi n. sp. a redescription of c. laius beveridge, 1999 from the same host species is included. mo ... | 2019 | 31111307 |
| the effects of zoo visitors on quokka (setonix brachyurus) avoidance behavior in a walk-through exhibit. | the behavior of zoo animals may be influenced by visitors, with possible implications on animal welfare. we examined the effects of the presence of visitors on the presence and visibility of free-ranging quokkas (setonix brachyurus) in preferred areas of a walk-through enclosure at melbourne zoo, australia. in a controlled experiment, two visitor treatments were randomly imposed: (1) enclosure open to visitors as normal ("open") and (2) enclosure closed to visitors ("closed"). treatments were im ... | 2018 | 29992613 |
| quokka: a comprehensive tool for rapid and accurate prediction of kinase family-specific phosphorylation sites in the human proteome. | kinase-regulated phosphorylation is a ubiquitous type of post-translational modification (ptm) in both eukaryotic and prokaryotic cells. phosphorylation plays fundamental roles in many signalling pathways and biological processes, such as protein degradation and protein-protein interactions. experimental studies have revealed that signalling defects caused by aberrant phosphorylation are highly associated with a variety of human diseases, especially cancers. in light of this, a number of computa ... | 2018 | 29947803 |
| speciation in the genus cloacina (nematoda: strongylida): species flocks and intra-host speciation. | sequences of the first and second internal transcribed spacers (its1 + its2) of nuclear ribosomal dna were employed to determine whether the congeneric assemblages of species of the strongyloid nematode genus cloacina, found in the forestomachs of individual species of kangaroos and wallabies (marsupialia: macropodidae), considered to represent species flocks, were monophyletic. nematode assemblages examined in the black-striped wallaby, macropus (notamacropus) dorsalis, the wallaroos, macropus ... | 2017 | 28697818 |
| curvature reduces bending strains in the quokka femur. | this study explores how curvature in the quokka femur may help to reduce bending strain during locomotion. the quokka is a small wallaby, but the curvature of the femur and the muscles active during stance phase are similar to most quadrupedal mammals. our hypothesis is that the action of hip extensor and ankle plantarflexor muscles during stance phase place cranial bending strains that act to reduce the caudal curvature of the femur. knee extensors and biarticular muscles that span the femur lo ... | 2017 | 28348929 |
| the influence of stimulus valence on confirmation bias in children. | the aim of the present study was to replicate our previous study and to further examine the relation between fear and positive and negative confirmation bias in children. | 2017 | 27423221 |
| molecular characterization of native australian trypanosomes in quokka (setonix brachyurus) populations from western australia. | the quokka, setonix brachyurus, is a vulnerable, small marsupial endemic to western australia. blood samples were collected from quokkas from three different geographical locations; two peoples bay, bald island and rottnest island. the overall prevalence of trypanosomes by nested pcr at the 18s ribosomal rna gene was 57.3% (63/110) with prevalences of 91.4%, 85.3% and 4.9% respectively for two peoples bay, bald island and rottnest island. phylogenetic analysis conducted on 47 18s pcr positives i ... | 2016 | 26697991 |
| a state of non-specific tension in living matter? stress in australian animals. | evidence of stress responses in australian animals is reviewed through a series of case studies involving desert frogs and lizards, small carnivorous marsupials, desert wallabies, a dwarf kangaroo species, the quokka wallaby and a small nectarivorous bird. an operational definition of stress as "the physiological resultant of demands that exceed an animal's homeostatic capacities" is used to identify instances of stress responses in the field, and to gauge their intensity. clear evidence of stre ... | 2017 | 26449159 |
| investigation of the morphological diversity of the potentially zoonotic trypanosoma copemani in quokkas and gilbert's potoroos. | trypanosomes are blood-borne parasites that can cause severe disease in both humans and animals, yet little is known of the pathogenicity and life-cycles of trypanosomes in native australian mammals. trypanosoma copemani is known to be infective to a variety of australian marsupials and has recently been shown to be potentially zoonotic as it is resistant to normal human serum. in the present study, in vivo and in vitro examination of blood and cultures from australian marsupials was conducted u ... | 2015 | 26160545 |
| eimeria collieie n. sp. (apicomplexa:eimeriidae) from the western long-necked turtle (chelodina colliei). | a new species, eimeria collieie n. sp., is described from the western long-necked turtle (chelodina colliei). sporulated oocysts (n = 35) are spherical to subspherical, with colourless single layer oocyst wall, 0.6 ± 0.2 (0.4-0.7) µm thick. oocyst with elongated ellipsoid sporocysts. oocyst length, 29.8 ± 0.4 (28.2-31.0) µm; oocyst width, 29.4 ± 0.3 (28.0-30.8) µm; oocyst length/width (l/w) ratio, 1.0 ± 0.03 (1.0-1.05). micropyle, oocyst residuum and polar granule were absent. sporocysts with sp ... | 2015 | 25917644 |
| the innate resistance of trypanosoma copemani to human serum. | trypanosoma copemani is known to be infective to a variety of australian marsupials. characterisation of this parasite revealed the presence of stercorarian-like life-cycle stages in culture, which are similar to t. rangeli and t. cruzi. the blood incubation infectivity test (biit) was adapted and used to determine if t. copemani, like t. cruzi and t. rangeli, has the potential to grow in the presence of human serum. to eliminate any effects of anticoagulants on the complement system and on huma ... | 2015 | 25816975 |
| fear-related confirmation bias in children: a comparison between neutral- and dangerous-looking animals. | the purpose of this study was to examine confirmation bias in children without explicitly inducing fear. eighty non-clinical children (7-13 years) were shown pictures of a neutral animal (quokka) and two dangerous-looking animals (aye aye and possum). for each animal, levels of perceived fear, threat and request for additional threatening or non-threatening information were obtained. a behavioral approach test (bat) was included as behavioral measure of fear. the results indicated that the aye a ... | 2015 | 25096507 |
| further characterisation of two eimeria species (eimeria quokka and eimeria setonicis) in quokkas (setonix brachyurus). | the identification and characterisation of novel eimeria species has largely been based on sporulated oocyst and sporocyst morphology, the host species and the geographical range. variation in the size and shape of eimeria oocysts across their host range however, make the identification and characterisation of novel species using traditional methodologies alone problematic. the use of molecular markers and phylogenetic analysis has greatly advanced our ability to characterise eimeria species and ... | 2014 | 24508502 |
| identification of novel babesia and theileria genotypes in the endangered marsupials, the woylie (bettongia penicillata ogilbyi) and boodie (bettongia lesueur). | piroplasms, which include the genera theileria and babesia, are blood-borne parasites transmitted mainly by tick vectors. relatively little is known about their prevalence and clinical impact in australian marsupials. in the present study the occurrence and molecular phylogeny of these parasites were studied in both wild and captive marsupials from western australia (wa) and queensland (qld). blood samples were screened by microscopy and molecular methods, using pcr and dna sequencing of the 18s ... | 2012 | 22433913 |
| vector of trypanosoma copemani identified as ixodes sp. | summarya total of 41 ticks were collected from 15 quokkas on bald island and 2 ticks from a gilbert's potoroo from two peoples bay. three species of ixodid ticks ixodes australiensis, ixodes hirsti and ixodes myrmecobii were identified on the quokkas known to have a high prevalence of trypanosoma copemani. tick faeces from ticks isolated from 8 individual quokkas and a gilbert's potoroo were examined with one identified as positive for trypanosomes. faecal examination revealed trypanosomes simil ... | 2011 | 21518469 |
| diversity of color vision: not all australian marsupials are trichromatic. | color vision in marsupials has recently emerged as a particularly interesting case among mammals. it appears that there are both dichromats and trichromats among closely related species. in contrast to primates, marsupials seem to have evolved a different type of trichromacy that is not linked to the x-chromosome. based on microspectrophotometry and retinal whole-mount immunohistochemistry, four trichromatic marsupial species have been described: quokka, quenda, honey possum, and fat-tailed dunn ... | 2010 | 21151905 |
| molecular characterization of blastocystis isolates from zoo animals and their animal-keepers. | blastocystis is an enteric protist and one of the most frequently reported parasitic infections in humans and a variety of animal hosts. it has also been reported in numerous parasite surveys of animals in zoological gardens and in particular in non-human primate species. pcr-based methods capable of the direct detection of blastocystis in faeces were used to detect blastocystis from various hosts, including non-human primates, australian native fauna, elephants and giraffes, as well as their ke ... | 2010 | 20089360 |
| morphological and molecular characterization of trypanosoma copemani n. sp. (trypanosomatidae) isolated from gilbert's potoroo ( potorous gilbertii) and quokka ( setonix brachyurus). | little is known of the prevalence and life-cycle of trypanosomes in mammals native to australia. native australian trypanosomes have previously been identified in marsupials in the eastern states of australia, with one recent report in brush-tailed bettongs (bettongia penicillata), or woylie in western australia in 2008. this study reports a novel trypanosoma sp. identified in blood smears, from 7 critically endangered gilbert's potoroos (potorous gilbertii) and 3 quokkas (setonix brachyurus) in ... | 2009 | 19416553 |
| evolution of lactation: nutrition v. protection with special reference to five mammalian species. | the evolutionary origin of the mammary gland has been difficult to establish because little knowledge can be gained on the origin of soft tissue organs from fossil evidence. one approach to resolve the origin of lactation has compared the anatomy of existing primitive mammals to skin glands, whilst another has examined the metabolic and molecular synergy between mammary gland development and the innate immune system. we have reviewed the physiology of lactation in five mammalian species with spe ... | 2008 | 19087365 |
| functional respiratory morphology in the newborn quokka wallaby (setonix brachyurus). | a morphological and morphometric study of the lung of the newborn quokka wallaby (setonix brachyurus) was undertaken to assess its morphofunctional status at birth. additionally, skin structure and morphometry were investigated to assess the possibility of cutaneous gas exchange. the lung was at canalicular stage and comprised a few conducting airways and a parenchyma of thick-walled tubules lined by stretches of cuboidal pneumocytes alternating with squamous epithelium, with occasional portions ... | 2007 | 17553103 |
| compensatory and transneuronal plasticity after early collicular ablation. | plasticity within the visual system was assessed in the quokka wallaby following unilateral superior collicular (sc) ablation at postnatal days (p) 8-10, prior to the arrival of retinal ganglion cell (rgc) axons. at maturity (p100), projections were traced from the eye opposite the ablation, and total rgc numbers were estimated for both eyes. ablations were partial (28-89% of sc remaining) or complete (0-5% of sc remaining). projections to the visual centers showed significant bilateral (p < 0.0 ... | 2007 | 17183539 |
| cone topography and spectral sensitivity in two potentially trichromatic marsupials, the quokka (setonix brachyurus) and quenda (isoodon obesulus). | the potential for trichromacy in mammals, thought to be unique to primates, was recently discovered in two australian marsupials. whether the presence of three cone types, sensitive to short- (sws), medium- (mws) and long- (lws) wavelengths, occurs across all marsupials remains unknown. here, we have investigated the presence, distribution and spectral sensitivity of cone types in two further species, the quokka (setonix brachyurus) and quenda (isoodon obesulus). immunohistochemistry revealed th ... | 2005 | 15888411 |
| studies of learning and problem solving in two species of australian marsupials. | this article reviews the authors' recent work with two species of australian marsupials on several learning and conditioning experiments. the quokka (setonix brachyurus) is a cat-sized herbivorous wallaby that inhabits offshore islands around south-western australia. the fat-tailed dunnart (sminthopsis crassicaudata) is a mouse-sized carnivorous marsupial that inhabits much of inland australia. both species were successful in learning simple discriminations, learning sets and reversal sets. quok ... | 2004 | 15527864 |
| detour behavior in the quokka (setonix brachyurus). | four quokkas (setonix brachyurus) were tested in their natural environment for the ability to progress around a barrier to a desired goal object (food). symmetrical and asymmetrical barriers were used with different lengths of side arm. three quokkas showed significant tendencies to progress either left or right around the barrier, though this laterality declined as the length of the side arm of the barrier was extended. one quokka showed no behavioral laterality and this animal was also the onl ... | 2004 | 15499677 |
| numbers of neurons in the retinal ganglion cell layer of the rat do not change throughout life. | there have been many assumptions made about neuronal loss in mammals due to aging. however, when we examined the retinal ganglion cell layer of a marsupial, the quokka, from 0.5 to 13.5 years of age, we found that the total neuron number did not decrease significantly even into extreme old age. the retinal area increased slowly throughout life, leading to a decrease in cell density. neuronal death in the rat retina has been assumed, since the cell density has been seen to fall with age. however, ... | 2003 | 14624063 |
| morphometry and allometry of the postnatal marsupial lung development: an ultrastructural study. | an utrastructural morphometric study of the postnatally remodelling lungs of the quokka wallaby (setonix brachyurus) was undertaken. allometric scaling of the volumes of the parenchymal components against body mass was performed. most parameters showed a positive correlation with body mass in all the developmental stages, except the volume of type ii pneumocytes during the alveolar stage. the interstitial tissue and type ii cell volumes increased slightly faster than body mass in the saccular st ... | 2003 | 14609519 |
| blastocyst transfer in the marsupial setonix brachyurus. | 1963 | 14064212 | |
| effects of ovariectomy in the marsupial setonix brachyurus. | 1963 | 14064211 | |
| the erologic epidemiology of reovirus infection with special reference to the rottnest island quokka (setonix brachyurus). | 1963 | 14047135 | |
| the development of certain external characters in the young of the macropod marsupial setonix brachyurus. | 1961 | 14037695 | |
| metabolism and kidney function in the pouch young of the macropod marsupial setonix brachyurus. | 1962 | 13967542 | |
| influence of the size of enclosure of the development of myopathy in the captive rottnest quokka. | 1963 | 13965064 | |
| sweat glands in the skin of the quokka of western australia. | 1961 | 13901424 | |
| myopathy affecting the rottnest quokka (setonix brachyurus) reversed by alpha-tocopherol. | 1961 | 13750830 | |
| the metabolism of carbohydrate and volatile fatty acids in the marsupial setonix brachyurus. | 1961 | 13687013 | |
| properties of the erythrocytes of two marsupials: the brush-tail possum, trichosurus vulpecula (kerr) and the quokka, setonix brachyurus (quoy & gaimard). | 1961 | 13687012 | |
| configural learning in two species of marsupial (setonix brachyurus and sminthopsis crassicaudata). | four experiments examined the ability of quokkas (setonix brachyurus) and fat-tailed dunnarts (sminthopsis crassicaudata) to solve 2 configural tasks: transverse and negative patterning. transverse patterning requires the simultaneous solution of 3 overlapping discrimination problems (a+ b-, b+ c-, c+ a-). both species could solve the nonoverlapping (elemental) version of this task (u+ v-, w+ x-, y+ z-), but only dunnarts solved the transverse patterning task. negative patterning requires condit ... | 2003 | 12856789 |
| morphometry and allometry of the postnatal lung development in the quokka wallaby (setonix brachyurus): a light microscopic study. | the postnatally developing lungs of the quokka wallaby, setonix brachyurus, were investigated macroscopically and by light microscopic morphometry. lung, parenchymal and non-parenchymal volumes as well as the components of the latter two were analysed by regression analysis. the lungs comprised a single undivided left lung and a right lung with an adherent accessory lobe. septal tissue growth was most remarkable in the canalicular and saccular stages. between mid-canalicular stage and the saccul ... | 2003 | 12573880 |
| bait-delivered cabergoline for the reproductive control of the red fox (vulpes vulpes): estimating mammalian non-target risk in south-eastern australia. | cabergoline (cab) is a potent dopamine agonist and an inhibitor of prolactin (prl). in red foxes (vulpes vulpes), a single oral dose of 100 microg kg(-1) cab can cause abortions and postnatal cub mortality from at least day 21 of the 52-day pregnancy. the abortifacient activity of cab is owing to the suppression of prl, which is essential for luteotrophic support in some eutherian species. postnatal cub mortality probably results from a reduction in the development of the mammary ductile system, ... | 2001 | 11999299 |
| quokkas (setonix brachyurus) demonstrate tactile discrimination learning and serial-reversal learning. | two male quokkas (setonix brachyurus: a herbivorous macropod marsupial) were trained to discriminate pairs of stimuli in the laboratory. quokkas indicated their choice by pulling on 1 of 2 simultaneously presented cords. the quokkas' discrimination abilities were tested on 6 tactile and 6 visual discrimination tasks. correct responses were rewarded with food. for both quokkas, all tactile tasks were learned to a criterion of 75% correct in up to 4 20-trial sessions. no visual task maintained cri ... | 2002 | 11930935 |
| morphological analysis of the postnatally developing marsupial lung: the quokka wallaby. | we investigated the events that take place during the postnatal morphogenesis of the lung of the quokka wallaby, setonix brachyurus, using the light microscope and both the scanning and transmission electron microscopes. the lung of term, newborn babies (joeys) at 3-days of postnatal life was at late canalicular stage and comprised large airways and tubules separated by thick mesenchymal interstitium. the tubules were lined by a low cuboidal epithelium but had few portions with true gas exchange ... | 2001 | 11241194 |
| number of neurons in the retinal ganglion cell layer of the quokka wallaby do not change throughout life. | during adult life, the topography of the retinal pigment epithelium (rpe) of the quokka wallaby changes gradually. cells in peripheral retina enlarge in surface area while those in mid-temporal retina, adjacent to the area centralis, a high density region in the ganglion cell layer, decrease in area, implying that the tissue in this area is drawing together. we speculated that high ganglion cell densities in temporal regions might be maintained, in the face of cell loss due to aging, by this app ... | 1999 | 10456988 |
| experimental eye enlargement in mature animals changes the retinal pigment epithelium. | form deprivation has been shown to result in myopia in a number of species such that the eye enlarges if one eye is permanently closed at the time of eye opening. in the quokka wallaby, the eye grows slowly throughout life. after form deprivation, the eye enlarges by 1-1.5 years of age to the size of that in a 4-6-year-old animal and the number of multinucleated retinal pigment epithelial (rpe) cells in the enlarged retina remains much lower than would be expected in eyes of comparable size. her ... | 1999 | 10431911 |
| the effects of a transient increase in temperature on cell generation and cell death in the hippocampus and amygdala of the wallaby, setonix brachyurus (quokka). | we examined the effects of a single exposure to a temperature elevation of 2 degrees c for a 2 h period on the developmental processes of cell division and cell death in the hippocampus and the amygdala of the quokka. animals aged postnatal day (p) 4045 were injected with tritiated (3h-) thymidine and then exposed to either 37 degrees c (normal) or 39 degrees c (+/-0.2 degrees c) in an incubator for a duration of 2 h. the young were then returned to the nipple and, after a period of 24 h, were s ... | 1998 | 9808303 |
| anatomical comparison of the macaque and marsupial visual cortex: common features that may reflect retention of essential cortical elements. | this study identifies fundamental anatomical features of primary visual cortex, area v1 of macaque monkey cerebral cortex, i.e., features that are present in area v1 of phylogenetically distant mammals of quite different lifestyle and features that are common to other regions of cortex. we compared anatomical constituents of macaque v1 with v1 of members of the two principal marsupial lines, the dunnart and the quokka, that diverged from the eutherian mammalian line over 135 million years ago. f ... | 1998 | 9786408 |
| the effect of oestrus and the presence of pouch young on aerobic bacteria isolated from the pouch of the tammar wallaby, macropus eugenii. | qualitative changes in the culturable, aerobic bacterial flora isolated from the tammar pouch have been documented over the period leading up to oestrus, at the time of anticipated birth and in absence and presence of pouch young of varying ages. in a group of 12 animals studied thirty species of aerobic bacteria were isolated. twenty five species were found in pouches with no pouch young, 9 in pouches with young less than 3 weeks of age and 9 in pouches containing older animals. gram positive o ... | 1998 | 9775355 |
| effects of cabergoline on reproduction in three families of australian marsupials. | the effects of the prolactin inhibiting drug, cabergoline, on pregnant and lactating marsupials were investigated in four species from three diverse families: the tammar wallaby, macropus eugenii, the quokka, setonix brachyurus, the brushtail possum, trichosurus vulpecula, and the fat-tailed dunnart, sminthopsis crassicaudata. in tammar wallabies, 20 micrograms cabergoline kg-1 injected intramuscularly 1 day before expected birth did not alter the timing of parturition but neonates died within a ... | 1998 | 9713388 |
| dopaminergic amacrine cells in the retina of the possum, trichosurus vulpecula. | the common brush-tailed possum trichosurus vulpecula is a small diprotodont marsupial common to both urban and natural environments. this is the first analysis of the neurotransmitter content of its retinal cells and, as the possum is a nocturnal forager, it was appropriate to begin with the dopaminergic amacrine cells that form an essential link in the modulation of the rod pathways subserving nocturnal vision. these results were compared with those from another diprotodont, the marsupial walla ... | 1998 | 9682872 |
| development and cell generation in the hippocampus of a marsupial, the quokka wallaby (setonix brachyurus). | development and cell generation in the hippocampus of the marsupial, the quokka wallaby, has been examined. cells in this brain region are similar in morphology to those in eutherian species, with predominantly pyramidal and granule cells. in the quokka, development of the hippocampus takes place postnatally; this region is first seen just after birth on postnatal day 1 (p1) as an out-pouching of the medial cortical wall into the lateral ventricle. the cornu ammonis (ca) region first appears at ... | 1997 | 9466706 |
| axon order in the visual pathway of the quokka wallaby. | axon order throughout the visual pathway of the quokka wallaby (setonix brachyurus) was determined after localised retinal applications of the tracers dii and/or diasp. postnatal days (p) 22-90 were studied to encompass the development and refinement of retinal projections. order was essentially similar at all stages. axons entered the optic nerve head true to their sector of retinal origin. in the optic nerve, nasal and temporal axons continued to reflect their retinal origin, dominating, respe ... | 1998 | 9455896 |
| transient axonal side branches in the developing mammalian optic nerve. | optic axons were labelled with horseradish peroxidase to establish the presence of side branches and examine their distribution and morphology in the developing optic nerve of the quokka wallaby, setonix brachyurus, the cat and rat at stages when axon numbers are at their peak. in each species, three quarters of the axons were essentially straight and lacked side branches. the remaining axons took significantly longer paths and bore side branches, mostly at points where axons undulated or change ... | 1998 | 9394042 |
| development of the lymphoid tissues of the tammar wallaby macropus eugenii. | a study has been made of the development of four lymphoid tissues from birth to maturity in the tammar wallaby macropus eugenii--the cervical and thoracic thymus, lymph nodes and gut-associated lymphoid tissue (galt). the development of these tissues in the tammar wallaby is similar to that in two other marsupials, the quokka setonix brachyurus and the virginian opossum didelphis virginiana. lymphocytes were first detected in the cervical thymus of the tammar at day 2 post partum and in the thor ... | 1997 | 9208435 |
| changing topography of the rpe resulting from experimentally induced rapid eye growth. | the retinal pigment epithelium (rpe) of the quokka wallaby. setonix brachyurus, grows and changes throughout life. to investigate factors that determine changes in the quokka rpe, we have examined topography of this tissue in experimentally enlarged eyes. unilateral eyelid suture was conducted at the time of normal eye opening, postnatal day (p) 110, and animals were examined at 1 or 1 1/2 years of age. the numbers and densities of rpe cells and the extent of multinucleation were compared with t ... | 1997 | 9194313 |
| retinal pigment epithelium and photoreceptor maturation in a wallaby, the quokka. | cell generation and the early stages of maturation of the retinal pigment epithelium (rpe) and photoreceptors were examined in a marsupial, the quokka, setonix brachyurus. results are presented for animals aged up to postnatal day (p)250. rpe cell generation was studied by analysis of cell number from wholemounted retinae and by tritiated thymidine (3hthy) autoradiography in sectioned material. for 3hthy autoradiography, quokkas aged p1-p200 were injected with 3hthy and killed either 6-20 hours ... | 1996 | 8797156 |
| a new family of entodiniomorph protozoa from the marsupial forestomach, with descriptions of a new genus and five new species. | a unique group of entodiniomorph protozoa was found in forestomach contents from quokka (setonix brachyurus), western grey kangaroo (macropus fuliginosus), red kangaroo (macropus rufus) and euro (macropus robustus erubescens). a new genus, macropodinium n.g., containing five new species, is described. three species are described from forestomach contents of the quokka: macropodinium baldense n. sp., macropodinium moiri n. sp. and macropodinium setonixum n. sp. a single species, macropodinium enn ... | 1996 | 8768432 |
| development and ageing of the rpe in a marsupial, the quokka. | we have previously shown that the mature adult quokka, aged between 8 and 15 years, has a distinct cell topography in the retinal pigment epithelium (rpe). we reported that the adult cell densities were high in central temporal retina and low in a peripheral band, adjacent to the ora serrata, a region with a concentration of multinucleate cells. in the present paper, we have studied the development of these features in order to understand how they mature, as well as to gain insight into regional ... | 1996 | 8759514 |
| retinal pigment epithelium topography in the mature quokka, setonix brachyurus. | in this paper we describe cell topography of the retinal pigment epithelium (rpe) for the mature marsupial wallaby, the quokka, setonix brachyurus. rpe topography was analysed in bleached and stained whole mounted retinae, sampling from the entire surface area. the mature adult quokka rpe has a distinct topography in terms of both cell density and the distribution of multinucleate cells. peripheral rpe demonstrates the lowest cell density and the greatest proportion of multinucleate cells. in an ... | 1996 | 8674516 |
| adrenalectomy and steroid replacement in a small macropodid marsupial, the quokka (setonix brachyurus): metabolic and renal effects. | contrary to previously accepted observations, the quokka (setonix brachyurus), a small macropodid marsupial, survival bilateral adrenalectomy indefinitely if injected with appropriate doses of cortisol and aldosterone, either singly or combined. normal behavior and plasma solute concentrations could be maintained indefinitely by daily i.m. injection of 0.2 mg cortisol acetate and 0.01 mg aldosterone/kg. plasma glucose concentration was maintained at the control value when the supplement containe ... | 1993 | 8504924 |
| morphology and birth dates of horizontal cells in the retina of a marsupial. | most eutherian (placental) mammals have two horizontal cell types; however, one type only has been seen in rodents. in order to assess whether one type of horizontal cell or two is a basic mammalian feature, we have examined the morphology of horizontal cells in a marsupial, the quokka wallaby, by golgi staining or horseradish peroxidase labelling. the birth dates of horizontal cells have also been determined by 3h-thymidine/autoradiography. there are two types of horizontal cell in the wallaby ... | 1994 | 8188858 |
| genetic, structural, and functional studies of a c3-like protein in the marsupial setonix brachyurus. | a monospecific goat antiserum was prepared against a putative c3 protein (quc3) from serum of the western australian macropod setonix brachyurus (quokka) using the classical method previously used to produce antiserum against c3 from other mammalian species. sodium dodecyl sulphate-polyacrylamide gel electrophoretic analysis of reduced immunoprecipitated quc3 revealed two polypeptide chains with an estimated m(r) of 128,000 and 82,000, respectively--presumably reflecting subunit molecules simila ... | 1993 | 8136176 |
| horizontal cells in the retina of the brush-tailed possum. | most species of eutherian (placental) mammals examined have two types of horizontal cell, one is axonless and the other has a short axon. we have recently shown that a marsupial, the quokka wallaby, also has two types of horizontal cell and that the axonless cell in this species has unusual stubby processes that pass through the inner nuclear layer to reach the inner plexiform layer. in order to discover whether these descending processes are a feature of marsupials in general, i examined the mo ... | 1994 | 8013586 |
| the complete primary structure of late lactation protein from quokka (setonix brachyurus). | the complete primary structure of the late lactation protein from the milk of quokka (setonix brachyurus) is presented. the amino acid sequence was established by n-terminal sequence analysis of high-performance liquid chromatography purified intact protein and peptides isolated from chemical and enzymatic digests of the protein. the protein contains 158 residues including four cysteines. the sequence comparison with the tamar wallaby (macropus eugenii) late lactation protein shows only five dif ... | 1994 | 7832979 |
| development of the visual cortex in a wallaby--phylogenetic implications. | the visual cortex of one of the smallest macropod marsupials, a wallaby, the quokka setonix brachyurus, was examined at maturity and during development from postnatal day 1 to 150 in nissl-stained or golgi-stained sections. injections of horseradish peroxidase into the primary visual centres in adults identified cortical neurons projecting to these regions. the pattern of cell generation was determined by tritiated thymidine/autoradiography. the adult visual cortex was composed of the usual six ... | 1995 | 7796093 |
| development of the chiasm of a marsupial, the quokka wallaby. | we have previously shown that the mature optic chiasm of a marsupial is divided morphologically into three regions, two lateral regions in which ipsilaterally projecting axons are confined and a central region containing only contralaterally projecting axons. by contrast, in the chiasms of eutherian (placental) mammals studied to date, there is no tripartite configuration. ipsilaterally and contralaterally projecting axons from each eye are mixed in the caudal nerve and in each hemichiasm and en ... | 1995 | 7499544 |
| difference in concentration of progesterone in plasma between pregnant and non-pregnant quokkas (setonix brachyurus). | the plasma progesterone concentrations during pregnancy and the oestrous cycle of the quokka were measured daily after each had been initiated by the removal of pouch young. progesterone levels ranged from 0.6 ng/ml in the early stages of the oestrous cycle to about 2.5 ng/ml at the peak of the luteal phase. there was no significant difference between pregnant and non-pregnant states before the removal of the pouch young nor in the latter half of the cycle. however, the plasma progesterone conce ... | 1980 | 7359075 |
| a quantitative comparison of the parts of the brains of two australian marsupials and some eutherian mammals. | the size and composition of the brains of the quokka wallaby (setonix brachyurus) and the brush-tailed possum (trichosurus vulpecula) were compared with those of the rat, rabbit, cat, sheep, and human. separate structures were taken from the brains by standardized dissection and their weights compared. particular attention was paid to the relationships between the size of the amygdala and other brain structures. marsupials were within the eutherian range in the ratio of whole brain weight to bod ... | 1981 | 7237105 |
| characterization and properties of a progesterone receptor in the uterus of the quokka (setonix brachyurus). | a progesterone receptor system, with a high specificity for progestins, was detected in the uterine tissue of the marsupial, setonix brachyurus (quokka), using the synthetic progestin 17 alpha, 21-dimethyl-19-nor-4,9-pregnadiene-3,20-dione (r5020). the apparent equilibrium dissociation constant of the ligand binding to the cytosolic component was 2.2 nmol/l, and to the nuclear component 4.8 nmol/l. significant loss of binding ability of the receptor occurred when cytosol was pretreated with dext ... | 1982 | 7200116 |
| lipomatosis in a quokka (setonix brachyurus) | 1982 | 7138440 | |
| quantitative alterations of the aerobic bacterial flora of the pouch of setonix brachyurus (quokka) during oestrus, anoestrus, pregnancy and lactating anoestrus (pouch young). | 1981 | 7041871 | |
| uterine factors and delayed implantation in macropodid marsupials. | local factors controlling uterine functions in macropodids are reviewed and the components of uterine fluids are examined. activation of the diapausing blastocyst and subsequent development of the expanding vesicle are associated with a changing uterine environment. concentrations of proteins, calcium and zinc in uterine exudates alter during gestation; the changes appear to be related both to the stage of development of the conceptus and to the hormonal milieu. in addition the endometrium itsel ... | 1981 | 7014865 |
| resistance to the nitrogen-mobilizing, diabetogenic action of cortisol in a small wallaby (setonix brachyurus). | 1981 | 7011896 | |
| the evolution of an area centralis and visual streak in the marsupial setonix brachyurus. | the distribution, morphology, size, and number of cells in the retinal ganglion layer of the marsupial setonix brachyurus, "quokka," was studied from 25 days postnatal to adulthood using nissl-stained wholemounts. the total cell population was evenly distributed up to 50 days, but by 75 days highest densities were generally observed in a broad band extending across the nasotemporal axis. at 87 days, a temporally situated area centralis was seen for the first time. this was embedded in a horizont ... | 1983 | 6863603 |
| a study of isolation procedures for multiple infections of salmonella and arizona in a wild marsupial, the quokka (setonix brachyurus). | 1982 | 6763026 | |
| marsupial neurohypophysial hormones: identification of mesotocin, lysine vasopressin, and phenypressin in the quokka wallaby (setonix brachyurus). | the neurohypophysial hormones of the quokka wallaby (setonix brachyurus) have been isolated through preparative high pressure liquid chromatography (hplc). one oxytocin-like and two vasopressin-like peptides have been found. these peptides have been characterized by their amino acid composition and by their retention time in hplc. mesotocin ([i1e8]-oxytocin) has been identified by amino acid composition, polar partition chromatography, high pressure liquid chromatography with a reversed phase co ... | 1983 | 6618161 |
| mortalities associated with herpesvirus infection in captive macropods. | fatal cases of herpesvirus infection in a quokka (setonix brachyurus), eight grey dorcopsis wallabies (dorcopsis muelleri luctuosa) in two separate outbreaks, as well as presumptive fatal herpesvirus infection in a western grey kangaroo (macropus fuliginosus) are described. all were captive animals and deaths were preceded by a period of stress. lesions occurred most often in alimentary tract epithelium, respiratory tract, skin, genital epithelium, conjunctivae, liver and adrenal cortex. herpesv ... | 1981 | 6264169 |
| toxoplasmosis in the rottnest quokka (setonix brachyurus). | 1966 | 6008521 | |
| regeneration of skeletal muscle in the rottnest quokka. | 1966 | 5973145 | |
| oxygen consumption during pouch development of the macropod marsupial setonix brachyurus. | 1. measurements of o(2) consumption at 9 or 10 temperatures in the 20-40 degrees c ambient temperature range were made on joeys with ages selected to cover the 180-day period of pouch occupancy.2. the rate of o(2) consumption of joeys younger than 100 days increased directly with ambient temperature.3. after 100 days of age the o(2) consumption rate at low temperatures rose and at about 140 days of age a constant rate was maintained over the full ambient temperature range.4. heat transfer from j ... | 1966 | 5972171 |
| environmental influences on daily and seasonal activity in setonix brachyurus (quoy and gaimard) (marsupialia). | 1965 | 5835844 | |
| observations on the behavior of the marsupial setonix brachyurus (quoy and gaimard) in an enclosure. | 1969 | 5813259 | |
| the myocardial lesions in the rottnest quokka with nutritional myopathy. | 1968 | 5709985 | |
| the corticospinal tract of the quokka wallaby (setonix brachyurus). | 1971 | 5556667 | |
| growth of striated muscle in an australian marsupial (setonix brachyurus). | 1970 | 5442226 | |
| the corticospinal tract of the wallaby (setonix brachyurus). | 1970 | 5413634 | |
| corticosteroids in the adrenal venous and heart blood of the quokka, setonix brachyurus (marsupialia: macropodidae). | 1969 | 5403616 | |
| the ultrastructure of the neonatal thymus of a marsupial, setonix brachyurus. | 1969 | 5377806 | |
| electrophysiological studies in the rottnest quokka with nutritional myopathy. | 1969 | 5373689 | |
| the early development of the incisor teeth of setonix brachyurus (macropodidae: marsupialia) with special reference to the prelacteal teeth. | 1968 | 5238886 | |
| the vascularity of the enamel organ in the developing teeth of setonix brachyurus and trichosurus vulpecula (marsupialia). | 1967 | 5237930 | |
| principles of myopathology as illustrated in the nutritional myopathy of the rottnest quokka (setonix brachyurus). | 1966 | 5230219 | |
| an account of the enamel cord in setonix brachyurus (marsupialia) and on the presence of an enamel knot in trichosurus vulpecula. | 1967 | 5227473 | |
| the homology of the premolar teeth in setonix brachyurus (macropodidae: marsupialia). | 1966 | 5226519 | |
| the organization of dense projections in synapses of the brain of a marsupial, setonix brachyurus. | 1972 | 5073213 | |
| delayed hypersensitivity in the marsupial setonix brachyurus (quokka). | 1972 | 5031325 |