Alexis F. L. A. Powell

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Whole mitochondrial genome sequences have been used in studies of animal phylogeny for two decades, and current technologies make them ever more available, but methods for their analysis are lagging and best practices have not been established. Most studies ignore variation in base composition and evolutionary rate within the mitogenome that can bias(More)
Renal hemangioendothelioma (HE) is an extremely rare malignant tumor. The sixth case is presented and all six analysed. The tumor affects middle-aged persons of either sex with past history of chronic renal disease and very recent onset of renal pain and hematuria. Anemia is common and a renal mass or tenderness is present. Pyelography shows poor function(More)
The Regal Fritillary (Speyeria idalia), which once occupied prairies and meadows in North America from the upper Great Plains to the Atlantic coast, has disappeared in recent decades from nearly the entirety of the eastern half of its range and has declined westward. In the Great Plains, where the species is limited to native prairie remnants, several large(More)
Determining the severity of acute mesenteric ischemia or reperfusion injury can be problematic, as early visceral hypoperfusion is difficult to detect by traditional laboratory testing. Likewise gauging the success of resuscitation and therapeutic intervention is also challenging to determine by laboratory analysis alone. Investigators continue to actively(More)
The New World blackbirds (Icteridae) are among the best known songbirds, serving as a model clade in comparative studies of morphological, ecological, and behavioral trait evolution. Despite wide interest in the group, as yet no analysis of blackbird relationships has achieved comprehensive species-level sampling or found robust support for most(More)
Endovascular treatment for aortic abnormality is an excellent alternative option for patients who are not good candidates for conventional open surgery. Although the technique of placing endovascular stent grafts has evolved since the first grafts, the basic principles remain the same. Use of endografts is limited by anatomic criteria, and advances in graft(More)
Free, autogenous vein segments were grafted to restore continuity of partially excised ureters in 12 mongrel dogs. Shortening and stricture formation of the vein graft occurred over the following four weeks. There was external adhesion around the graft but no urinary leakage, pooling or fistula. Intubation of the graft maintained patency but shortening(More)