| the organization of the sensory and motor areas of cerebral cortex in the platypus (ornithorhynchus anatinus). | | 1977 | 864030 |
| proceedings: progestagens and oestrogens in peripheral plasma of the platypus, ornithorhynchus anatinus. | | 1975 | 1127660 |
| proceedings: reproduction in the platypus, ornithorhynchus anatinus, with particular reference to the evolution of viviparity. | | 1975 | 1127659 |
| intestinal mucosa of the platypus, ornithorhynchus anatinus. | the intestinal mucosa of the platypus takes the form of numerous transverse surface folds. these folds are made up of a lamina propria covered by pseudostratified epithelium which lies on a thick modified basement membrane. the cells of the intestinal epithelium consist of columnar cells which generally resemble typical intestinal epithelium and cuboidal cells, which are undifferentiated in appearance, show few organelles and possess an electron lucent cytoplasm. numerous desmosomes are found be ... | 1975 | 1115355 |
| studies on monotreme proteins. v. amino acid sequence of the alpha-chain of haemoglobin from the platypus, ornithorhynchus anatinus. | | 1974 | 4464824 |
| peripheral auditory function in the platypus, ornithorhynchus anatinus. | | 1974 | 4853586 |
| biosynthesis of adrenocortical steroids by monotremes: echidna (tachyglossus aculeatus) and platypus (ornithorhynchus anatinus). | | 1973 | 4726325 |
| primary optic pathways in the duckbill platypus, ornithorynchus anatinus: an experimental degeneration study. | | 1972 | 4555426 |
| the light and electron microscopic structure of the femoral gland of the platypus (ornithorhynchus anatinus). | | 1971 | 5147314 |
| brunner's glands of the duckbilled platypus (ornithorhynchus anatinus). | | 1971 | 4255831 |
| an unusual basement membrane underlying intestinal epithelium of the platypus (ornithorhynchus anatinus). | | 1971 | 4104116 |
| [the external musculature of the eye in ornithorhyncus (ornithorhynchus anatinus shaw)]. | | 1969 | 4977584 |
| respiratory properties of blood and responses to diving of the platypus, ornithorhynchus anatinus (shaw). | | 1966 | 5967684 |
| the eye and ocular adnexa of the monotreme ornithorhynchus anatinus. | | 1953 | 13216795 |
| on the mammalian pelvis, with especial reference to the young of ornithorhynchus anatinus. | | 1893 | 17232057 |
| skin structure in newborn marsupials with focus on cutaneous gas exchange. | a morphological and morphometric study of the skin of a variety of newborn marsupials (dasyurus viverrinus, monodelphis domestica, trichosurus vulpecula, isoodon obesulus, perameles nasuta, phascolarctos cinereus, potorous tridactylus, petrogale penicillata, thylogale thetidi, macropus dorsalis) and of a monotreme hatchling (ornithorhynchus anatinus) was undertaken to assess the possibility of cutaneous gas exchange. additionally, the lungs of some of these species were investigated to assess it ... | 2018 | 29947022 |
| slow lorises use venom as a weapon in intraspecific competition. | animals have evolved an array of spectacular weapons, including antlers, forceps, proboscises, stingers, tusks and horns [1]. weapons can be present in males and females of species needing to defend critical limiting resources, including food (rhinoceros beetles, trypoxylus) and territories (fang blennies, meiacanthus) [1-3]. chemicals, including sprays, ointments and injected venoms, are another defence system used by animals. as with morphological weapons, venom can serve multiple purposes, in ... | 2020 | 33080192 |
| platypus predation has differential effects on aquatic invertebrates in contrasting stream and lake ecosystems. | predators can have strong impacts on prey populations, with cascading effects on lower trophic levels. although such effects are well known in aquatic ecosystems, few studies have explored the influence of predatory aquatic mammals, or whether the same predator has similar effects in contrasting systems. we investigated the effects of platypus (monotremata: ornithorhynchus anatinus) on its benthic invertebrate prey, and tested predictions that this voracious forager would more strongly affect in ... | 2020 | 32747705 |
| sequence comparisons of cytochrome p450 aromatases from australian animals predict differences in enzymatic activity and/or efficiency†. | aromatase (p450arom, cyp19a1) is the terminal enzyme in the synthesis of the steroid hormone family of estrogens. not surprisingly, this enzyme has structural similarities between the limited number of species studied thus far. this study examined the structure of aromatases from four diverse australian species including a marsupial (tammar wallaby; macropus eugenii), monotreme (platypus; ornithorhynchus anatinus), ratite (emu; dromaius novaehollandiae) and lizard (bearded dragon; pogona vittice ... | 2020 | 32179898 |
| a putative novel strain of ehrlichia infecting amblyomma tigrinum associated with pampas fox (lycalopex gymnocercus) in esteros del iberá ecoregion, argentina. | the current work evaluated road-killed pampas foxes (lycalopex gymnocercus) and their ticks for the presence of vector-borne agents in the ecoregion esteros del iberá in northeastern argentina. spleen, lung and blood samples and amblyomma tigrinum adult ticks collected from the foxes were tested by polymerase chain reaction (pcr) assays targeting bacteria of the genera ehrlichia, anaplasma, and rickettsia. all foxes tested were negative for the three genera, but evidence of ehrlichia and rickett ... | 2020 | 31711730 |
| quantitative analysis of forebrain pallial morphology in monotremes and comparison with that in therians. | we have made quantitative volumetric analyses of cerebral cortical (pallial) structures in the brains of three species of monotreme (ornithorhynchus anatinus, tachyglossus aculeatus, zaglossus bruijni) and compared the findings with similar measurements in a range of therian mammals (6 marsupials and 50 placentals). we have found that although the iso- and periallocortical grey matter volume of the monotremes is about what would be expected for their brain size, the proportion of iso- and perial ... | 2019 | 31146906 |
| the platypus: evolutionary history, biology, and an uncertain future. | the platypus (ornithorhynchus anatinus) is one of the world's most evolutionarily distinct mammals, one of five extant species of egg-laying mammals, and the only living species within the family ornithorhynchidae. modern platypuses are endemic to eastern mainland australia, tasmania, and adjacent king island, with a small introduced population on kangaroo island, south australia, and are widely distributed in permanent river systems from tropical to alpine environments. accumulating knowledge a ... | 2019 | 31043761 |
| mucin-like glycopolymer gels in electrosensory tissues generate cues which direct electrolocation in amphibians and neuronal activation in mammals. | mucin-like glycoproteins have established roles in epithelial boundary protection and lubricative roles in some tissues. this mini-review illustrates alternative functional roles which rely on keratan sulphate and sialic acid modifications to mucin glycopolymers which convey charge properties suggestive of novel electroconductive properties not previously ascribed to these polymers. many tumour cells express mucin-like glycopolymers modified with highly sulphated keratan sulphate and sialic whic ... | 2019 | 30804244 |
| early triassic marine reptile representing the oldest record of unusually small eyes in reptiles indicating non-visual prey detection. | the end-permian mass extinction (epme) led to reorganization of marine predatory communities, through introduction of air-breathing top predators, such as marine reptiles. we report two new specimens of one such marine reptile, eretmorhipis carrolldongi, from the lower triassic of hubei, china, revealing superficial convergence with the modern duckbilled platypus (ornithorhynchus anatinus), a monotreme mammal. apparent similarities include exceptionally small eyes relative to the body, snout end ... | 2019 | 30679783 |
| platypus induced pluripotent stem cells: the unique pluripotency signature of a monotreme. | the platypus (ornithorhynchus anatinus) is an egg-laying monotreme mammal whose ancestors diverged ∼166 million years ago from the evolutionary pathway that eventually gave rise to both marsupial and eutherian mammals. consequently, its genome is an extraordinary amalgam of both ancestral reptilian and derived mammalian features. to gain insight into the evolution of mammalian pluripotency, we have generated induced pluripotent stem cells from the platypus (pipscs). deep sequencing of the pipsc ... | 2019 | 30417748 |
| a pan-mammalian map of interhemispheric brain connections predates the evolution of the corpus callosum. | the brain of mammals differs from that of all other vertebrates, in having a six-layered neocortex that is extensively interconnected within and between hemispheres. interhemispheric connections are conveyed through the anterior commissure in egg-laying monotremes and marsupials, whereas eutherians evolved a separate commissural tract, the corpus callosum. although the pattern of interhemispheric connectivity via the corpus callosum is broadly shared across eutherian species, it is not known whe ... | 2018 | 30181276 |
| mining and functional verification of calcitonin genes from the genome database. | with more countries in the world entering elderly society, osteoporosis is a common disease among the elderly, especially middle-aged and elderly women. although calcitonin is an effective drug used to treat osteoporosis in clinical practice, it also exists such problems as high cost, short half-life, and high immunogenicity. therefore, to explore more efficient calcitonin has important clinical significance. | 2018 | 29745315 |
| a comparative genomic survey provides novel insights into molecular evolution of l-aromatic amino acid decarboxylase in vertebrates. | melatonin is a pleiotropic molecule with various important physiological roles in vertebrates. l-aromatic amino acid decarboxylase (aaad) is the second enzyme for melatonin synthesis. by far, a clear-cut gene function of aaad in the biosynthesis of melatonin has been unclear in vertebrates. here, we provide novel insights into the evolution of aaad based on 77 vertebrate genomes. according to our genome-wide alignments, we extracted a total of 151 aaad nucleotide sequences. a phylogenetic tree w ... | 2018 | 29659490 |
| use of implanted acoustic tags to assess platypus movement behaviour across spatial and temporal scales. | the platypus (ornithorhynchus anatinus) is an evolutionarily distinct mammal, endemic to australian freshwaters. many aspects of its ecology and life-history, including detailed understanding of movements, are poorly known, hampered by its cryptic and mainly nocturnal habits and small numbers. we effectively trialled intraperitoneal implanted acoustic transmitters in nine platypuses in the severn river (nsw), australia, as a potential approach for studying movements in this challenging species. ... | 2018 | 29572497 |
| characterization of the mel1c melatoninergic receptor in platypus (ornithorhynchus anatinus). | melatonin is a neurohormone produced in both animals and plants. it binds at least three g-protein-coupled receptors: mt1 and mt2, and mel1cgpr. mammalian gpr50 evolved from the reptilian/avian mel1c and lost its capacity to bind melatonin in all the therian mammal species that have been tested. in order to determine if binding is lost in the oldest surviving mammalian lineage of monotremes we investigated whether the melatonin receptor has the ability to bind melatonin in the platypus (ornithor ... | 2018 | 29529033 |