Search results for "Urodela"
showing 3 items of 3 documents
Morphology, ultrastructure and molecular characterisation of Spiroxys japonica Morishita, 1926 (Spirurida: Gnathostomatidae) from Pelophylax nigromac…
2014
Gnathostomatid nematodes identified morphologically as Spiroxys japonica Morishita, 1926 were collected from the dark-spotted frog Pelophylax nigromaculatus (Hallowell) (Amphibia: Ranidae) in China. Light and scanning electron microscopy were used to study the morphology of this species in detail. Previously unreported morphological features are revealed and others corrected. In addition, adult nematodes of S. japonica collected from P. nigromaculatus and Spiroxys hanzaki Hasegawa, Miyata & Doi, 1998 collected from Andrias japonicus (Temminck) (Caudata: Cryptobranchidae) in China and Japan, respectively, and the third-stage larva of S. japonica collected from Lithobates catesbeianus (Shaw) …
Down with the erythropoietin. Long live the erythropoietin!
2009
In recent years the use of erythropoietin has exploded, and the anaemia of patients with chronic renal failure has been practically resolved with the administration of rHuEpo (recombinant human, Erythropoietin). However, as a result of an intense commercial campaign, strong therapies with this growth hormone, prescribed to achieve surprising sporting performances, got athletes to run the risk of thrombosis and vascular accidents because of red blood cells increase. Erythropoietin represents a significant subject of research. In fact, besides the ability of stimulating erythrocyte production, it has many pleiotropic effects. Several studies allow the assertion that EPO, in different concentr…
Cracking the nut: Geographical adjacency of sister taxa supports vicariance in a polytomic salamander clade in the absence of node support
2008
The urodelan genus Lyciasalamandra, which inhabits a relatively small area along the southern Turkish coast and some Aegean islands, provides an outstanding example of a diverse but phylogenetically unresolved taxon. Molecular trees contain a single basal polytomy that could be either soft or hard. We here use the information of nuclear (allozymes) and mitochondrial (fractions of the 16S rRNA and ATPase genes) datasets in combination with area relationships of lineages to resolve the phylogenetic relationships among Lyciasalamandra species in the absence of sufficient node support. We can show that neither random processes nor introgressive hybridization can be invoked to explain that the m…