The propagation of a beneficial mutation in a spatially extended population is usually studied using the phenomenological stochastic Fisher-Kolmogorov-Petrovsky-Piscounov (SFKPP) equation. We derive here an individual-based, stochastic model founded on the spatial Moran process where fluctuations are treated exactly. The mean-field approximation of this model leads to an equation that is differ...

Sequence-derived structural and physicochemical features have frequently been used in the development of statistical learning models for predicting proteins and peptides of different structural, functional and interaction profiles. PROFEAT (Protein Features) is a web server for computing commonly-used structural and physicochemical features of proteins and peptides from amino acid sequence. It ...

The field of evolutionary psychology is growing in prominence and influence despite the reluctance of many social scientists to apply evolutionary principles to understanding human behavior (Segerstrale, 2000). Included among the phenomena that are now studied from this perspective are developmental activities and processes, and with this, the emergence of the subfield of evolutionary--developm...

The complexity of the field of mathematics makes the study of any associated learning disability daunting. In theory, a mathematical learning disability can result from deficits in the ability to represent or process information used in one or all of the many areas of mathematics (e.g., arithmetic and geometry), or in one or a set of individual domains (e.g., theorems vs. graphing) within each ...

BACKGROUND The Samburu region of northern Kenya is undergoing significant change, driven by factors including greater value on formal education, improvements in infrastructure and development, a shift from community to private ownership of land, increased sedentary lifestyles and global climate change. One outcome of these changes are an increasingly greater likelihood for adolescent boys to be...

Lazaros K. Gallos, Diego Rybski, Fredrik Liljeros, Shlomo Havlin, and Hernán A. Makse Levich Institute and Physics Department, City College of New York, New York, New York 10031, USA Potsdam Institute for Climate Impact Research, 14469 Potsdam, Germany Department of Sociology, Stockholm University, S-10691, Stockholm, Sweden and Institute for Futures Studies Box 591, SE-101 31 Stockholm, Sweden...

We challenge the notion that differences in spatial ability are the best or only explanation for observed sex differences in mathematical word problems. We suggest two ideas from the study of autism: sex differences in theory of mind and in central coherence. "Amy has two candies. She has one candy less than Mary. How many candies does Mary have?" Geary suggests that the male superiority with s...

1. introduction drought is one of the most complex problems not only in the management of water resources, but also creates economic and social issues . but the problem definition, identification and prediction of unresolved. the occurrence of drought can be caused by several factors, mainly rooted in the general circulation of the atmosphere and space physics, and earth's energy balance is sou...