Stochastic quantization of the linearized gravitational field

Stochastic field equations for linearized gravity are presented. The theory is compared with the usual quantum field theory and questions of Lorentz covariance are discussed. The classical radiation approximation is also presented.Comment: 14 page

Stochastic Models of Quantum Mechanics - A Perspective

A subjective survey of stochastic models of quantum mechanics is given along with a discussion of some key radiative processes, the clues they offer, and the difficulties they pose for this program. An electromagnetic basis for deriving quantum mechanics is advocated, and various possibilities are considered. It is argued that only non-local or non-causal theories are likely to be a successful basis for such a derivation.Comment: 15 pages. To appear in Proceedings of Foundations of Probability and Physics, held at Vaxjo University, Sweden, June 4-9, 2006. Published by the American Institute of Physic

Kidney regeneration: common themes from the embryo to the adult

The vertebrate kidney has an inherent ability to regenerate following acute damage. Successful regeneration of the injured kidney requires the rapid replacement of damaged tubular epithelial cells and reconstitution of normal tubular function. Identifying the cells that participate in the regeneration process as well as the molecular mechanisms involved may reveal therapeutic targets for the treatment of kidney disease. Renal regeneration is associated with the expression of genetic pathways that are necessary for kidney organogenesis, suggesting that the regenerating tubular epithelium may be “reprogrammed” to a less-differentiated, progenitor state. This review will highlight data from various vertebrate models supporting the hypothesis that nephrogenic genes are reactivated as part of the process of kidney regeneration following acute kidney injury (AKI). Emphasis will be placed on the reactivation of developmental pathways and how our understanding of the resulting regeneration process may be enhanced by lessons learned in the embryonic kidney.Fil: Cirio, Maria Cecilia. University of Pittsburgh; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: de Groh, Eric D.. University of Pittsburgh; Estados UnidosFil: de Caestecker, Mark P.. Vanderbilt University; Estados UnidosFil: Davidson, Alan J.. The University of Auckland; Nueva ZelandaFil: Hukriede, Neil A.. University of Pittsburgh; Estados Unido