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1

Specyfika zachowan eksploracyjnych oposa [Monodelphis domestica] i szczura [Rattus norvegicus] odmiany long-evans

100%
Wesierska M.
Kosmos
|
2002
|
tom 51
|
nr 1
19-33
2

Brazilian opossum [Monodelphis domestica] a new model in embryological experiments

100%
Turlejski K., Djavadian R.
Folia Morphologica
|
1998
|
tom 57
|
nr 1
3

Comparative analysis of alphaglobin and carbonic anhydrase I cDNAs of the opossum Monodelphis domestica with related vertebrate sequences

84%
Barome P. O.
Folia Biologica
|
2003
|
tom 51
|
nr 1-2
4

The cerebellar paraflocculus and the subarcuate fossa in Monodelphis domestica and other marsupial mammals - ontogeny and phylogeny of a brain-skull interaction

84%
Sanchez-Villagra M. R.
Acta Theriologica
|
2002
|
tom 47
|
nr 1
The development of the subarcuate fossa and the cerebellar paraflocculus was studied in an ontogenetic series of Monodelphis domestica Wagner, 1842 The spatial relation between these structures was examined qualitatively in adult specimens of several marsupial taxa. The fossa is first formed without participation of the cerebellar paraflocculus, which fills the fossa first fully and then partially later in development. The correlation between the size of the petrosal lobule of the paraflocculus and the subarcuate fossa in adults is weak. The volume of the subarcuate fossa was measured in 68 specimens representing 19 species of recent marsupials. Its size is negatively allometric with respect to skull size. The didelphids examined ('large opossums') have relatively smaller subarcuate fossae than the other marsupials examined, and Sarco- philus laniarius is the major outlier, with a very small fossa. Loss of the subarcuate fossa has occurred at least twice in metatherian evolution (some sparassodonts and wombats). All marsupials examined to date, with the exception of wombats, have a differentiated petrosal lobule of the paraflocculus.
5

Spontaneous behavior of the gray short-tailed opossum [Monodelphis domestica] in the elevated plus-maze: comparison with Long-Evans rats

84%
Wesierska M., Turlejski K.
Acta Neurobiologiae Experimentalis
|
2000
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tom 60
|
nr 4
We observed the spontaneous behavior of a laboratory marsupial - the gray short-tailed opossum (Monodelphis domestica) - in the elevated plus-maze (EPM) during six consecutive sessions and compared it with the behavior of Long-Evans rats. During the first exposure to the maze both species spent most of the time in the enclosed arms but opossums showed much higher frequency of entries into the open arms and stayed there longer. On the third and subsequent days opossums reduced their entries into the open arms and spent more time on the central square, where unlike rats they frequently groomed their lower belly and hind legs. During the last sessions they started spending more time in the enclosed arms. It is concluded that probably opossums, like rats show a stable anxiety evoked by open space. However, in the rat anxiety prevails over motivation to explore a new environment, while in the opossum it is initially at equilibrium with curiosity which habituates slower than in the rat. Results are discussed in the context of different ecology of the gray opossum that actively searches and hunts quickly moving insects. Thigmotaxic behavior, while strong in both species, dominates spontaneous behavior of the rat, but not opossum.
6

Reduction of the number of new cells reaching olfactory bulbs impairs olfactory perception in the adult opossum

67%
Grabiec M., Turlejski K., Djavadian R.
Acta Neurobiologiae Experimentalis
|
2009
|
tom 69
|
nr 2
168-176
In adult mammals cells generated in the subventricular zone (SVZ) migrate to olfactory bulbs (OB). Functional significance of this continuous neurogenesis is not clear. We injected opossums (Monodelphis domestica) for seven consecutive days with a 5HT1A agonist (8-OH-DPAT or buspirone), or its antagonist WAY100635. One hour after each of these injections bromodeoxyuridine (BrdU), a marker of dividing cells was also injected. Two months later, when newly generated neurons settled in the OB and matured the ability of these opossums to detect hidden food by olfactory cues was tested. Afterwards, numbers of BrdU-labeled cell nuclei in their OB were counted and a phenotype of labeled cells established. In all groups investigated the majority of new cells differentiated into neurons (55-76%) and a lower proportion into astroglia (6-12%). Numbers of BrdU-labeled cells differed depending on the applied treatment: both agonists of the 5HT1A receptor increased these numbers, while its antagonist decreased them. The increased number of new OB interneurons did not change the time required for finding all three food items and therefore did not improve the opossums' performance in this test of the olfactory perception. However, opossums that had the reduced number of new generated OB cells searched longer for each food item and in consequence took three times longer to find all three crickets, than did opossums from other groups. In conclusion, lower numbers of new neurons in the opossums OB correlated with their worse behavioral performance in a test based on olfactory perception.
7

Correlation between dopaminergic phenotype and expression of calretinin in the midbrain nuclei of the opossum (Monodelphis domestica): An immunohistological study

67%
Klejbor I., Ludkiewicz B., Wojcik S., Turlejski K.
Acta Neurobiologiae Experimentalis
|
2013
|
tom 73
|
nr 4
We investigated distribution and morphology of neurons of the midbrain nuclei: the ventral tegmental area (VTA), substantia nigra (SN) and periaqueductal gray (PAG) of the adult grey short-tailed opossums that were double immunolabeled for the presence of calretinin (CR) and/or tyrosine hydroxylase (TH). The majority of TH-immunopositive neurons and fibers were located in the VTA, SN, and only scarce population of small neurons expressing TH was present in the PAG. In the SN 80% of TH-expressing neurons had large cell bodies, and only a small fraction had small perikarya. In the PAG populations of large and medium sized neurons were equal and 20% of neurons had small perikarya. Much scarcer population of TH-immunoreactive neurons in the PAG consisted of large or small neurons in its dorsal part (PAGd) and almost exclusively small neurons in the ventral part (PAGv). Distribution of neurons expressing TH and their types in the opossum are similar to those in rodents. The majority of CR-immunolabeled neurons were found in the VTA. In its subdivision, the parabrachal pigmented nucleus (PBP) cells expressing CR were approximately 28% more numerous than cells expressing TH. In spite of that, only 42% of TH-expressing neurons coexpressed CR. The high degree of colocalization TH and CR was observed in the SN. We propose that a higher percentage of TH/CR colocalization, which is observed in the opossums SN, may give them the ability to adapt to changes in their motor functions.
8

Projection of visuotopically organized afferents to the dorsal thalamus in the opossum, Monodelphis domestica

67%
Turlejski K., Djavadian R. L., Saunders N. R.
Acta Neurobiologiae Experimentalis
|
1994
|
tom 54
|
nr 4
9

Acoustic startle response in the opossum Monodelphis domestica in comparison with the Wistar albino rat

67%
Blaszczyk J. W., Turlejski K.
Acta Neurobiologiae Experimentalis
|
2005
|
tom 65
|
nr 2
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