The literature on migration groups the emigration-drivers into two large categories: negative circumstances in the country of origin and positive aspects of the country of SHEA destination, with geographical distance usually being a significant barrier for the migration flows.In the context of large-scale and rapidly growing international migration
The present contribution is devoted to some aspects of history and evolution of the early Solar system.The origin of the Sun, Earth, other planets and its satellites has long been a matter of great concern for people.Over the past few decades astronomers and cosmologists have considerably advanced in the perception of the structure, history, and ev
ABSTRACT Selectable markers are indispensable for genetic engineering, yet their number and variety are limited.Most selection procedures for prototrophic cells rely on the introduction of antibiotic resistance genes.New minimally invasive tools are needed to facilitate sophisticated genetic manipulations.Here, we characterized three endogenous gen
The endogenous mechanism that determines vertebrate body length is unknown but must involve loss of chordo-neural-hinge (CNH)/axial stem cells and mesoderm progenitors in the tailbud.In early embryos, Fibroblast growth factor (FGF) maintains a cell pool that progressively generates the body and differentiation onset is driven by retinoid repression