Although evolutionary change within most species is thought to occur slowly, recent studies have identified cases where evolutionary change has apparently occurred over a few generations. Anthropogenically altered environments appear particularly open to rapid evolutionary change over comparatively short time scales. Here, we consider a Pacific salmon population that may have experienced life-h...

The paper explores migrant workers careers in the health sector, comparing the Spanish case and the British case. International migration has become an important feature of globalized labour markets in health care. Recently, concerns over the need of ensuring staff and skill shortages in the health system are becoming a common issue in many European countries. Following this, the paper is focus...

New tools of genomic analysis shed light on historical puzzles. Migrations of ancient peoples, differences in migration patterns of males and females, historical demography of cultures with ancient roots, and patterns of human genetic diversity are increasingly the focus of integrated analysis by historians, anthropologists, and geneticists.

Given the geography and agroclimatic conditions of the Southeast, coupled with continued population expansion from in-migration, local foods markets may be a promising niche market for some farms in the region. The Southeast has more small farms than any other U.S. region. Using farm-level data, we address the question of how successful southeastern farms engaged in direct sales to consumers di...

Why is there such wide-spread opposition to immigration, although attitudes are generally favorable towards trade? Using concepts from population ethics, this paper shows that impartial observers oppose unskilled immigration if they are inequality-averse, base their decisions on national interest, and have an integrative view of immigration. Moreover, unskilled immigration makes redistribution ...

Constant immigration can stabilize population size fluctuations but its effects on extinction remain unexplored. We show that constant immigration significantly reduced extinction in fruitfly populations with relatively stable or unstable dynamics. In unstable populations with oscillations of amplitude around 1.5 times the mean population size, persistence and constancy were unrelated. Low immi...

In this paper we explicitly calculate fundamental solutions for the Tricomi operator, relative to an arbitrary point in the plane, and show that all such fundamental solutions originate from the hypergeometric function F (1/6, 1/6; 1; ζ) that is obtained when we look for homogeneous solutions to the reduced hyperbolic Tricomi equation.

In this paper we explicitly calculate fundamental solutions for the Tricomi operator, relative to an arbitrary point in the plane, and show that all such fundamental solutions originate from the hypergeometric function F(1/6, 1/6; 1; ζ ) that is obtained when we look for homogeneous solutions to the reduced hyperbolic Tricomi equation.

This is the second of three lectures on introduction to vertex operator algebras. In this lecture, we shall continue Professor Dong’s lecture to present more fundamental properties of vertex operator algebras. From the mathematical point of view, a vertex operator algebra formally resembles a Lie algebra because the Jacobi identity is used as one of the main axioms. For the Lie algebra aspect o...