Pterosaurs are extinct flying reptiles, the first vertebrates to achieve powered flight. Our understanding of the evolutionary transition between basal, predominantly long-tailed forms to derived short-tailed pterodactyloids remained poor until the discovery of Wukongopterus and Darwinopterus in western Liaoning, China. In this paper we report on a new genus and species, Douzhanopterus zhengi, ...

Patterns of selection are widely believed to differ geographically, causing adaptation to local environmental conditions. However, few studies have investigated patterns of phenotypic selection across large spatial scales. We quantified the intensity of selection on morphology in a monogamous passerine bird, the barn swallow Hirundo rustica, using 6495 adults from 22 populations distributed acr...

I investigate the mechanisms through which idiosyncratic investment risk generates a fat tail of the wealth distribution. I set up a continuous time OLG model with a bequest motive and portfolio selection to show that idiosyncratic investment risk generates a Pareto tail in the wealth distribution. I calibrate my model to the U.S. economy and show that the wealth distribution in the simulated e...

Thylamys pallidior (O. Thomas, 1902) is a didelphid marsupial commonly called the white-bellied fat-tailed mouse opossum. A small mouse opossum, with tricolored pelage and a white venter, it has a seasonally incrassated tail, where fat deposits, primarily at the tail base, function in food storage. It is the most widely distributed species in the genus occurring from southwestern Peru and north...

The poly(A) tail, co-transcriptionally added to most eukaryotic mRNAs, plays an important role in posttranscriptional regulation through modulating mRNA stability and translational efficiency. The length of the poly(A) tail is dynamic, decreasing or increasing in response to various stimuli through the action of enzymatic complexes, and changes in tail length are exploited in regulatory pathway...

The translational control of many maternal mRNAs in oocytes and early embryos relies on changes in poly(A) tail length; the factors controlling poly(A) tail length are being identified in a range of species.

ancylostoma tubaeforme was originally described as a separate species parasitizing the cat. the adults of a. tubaeforme are 7 to 12 mm long. a. tubaeforme can be differentiated from the adults of a. braziliense and a. ceylanicum by the presence of three teeth. here we describe the first re­port of a. tubaeforme in a persian young female leopard, 2-3 years old, with head and trunk length 120 cen...