Alfred Guillou Redfield

Rosie Redfield

Rosie Redfi eld is Professor of Zoology at the University of British Columbia, where she has been since 1990. Her research investigates the evolution and molecular biology of natural transformation in bacteria (her cocktail-party summary is “Do bacteria have sex?”). She blogs about her research at RRResearch. blogspot.com, where a recent blog post received a lot of attention from both scientist...

Redfield Reduced Dynamics and Entanglement

In phenomenological applications the time evolution of subsystems immersed in an external environment are sometimes described by Markovian semigroups of Redfield type that result non-positive: the appearence of negative probabilities is avoided by restricting the admissible initial conditions to those states that remain positive under the action of the dynamics. We show that this often adopted ...

Biogeochemical cycling in the oligotrophic ocean: Redfield and non-Redfield models

The assumption of fixed elemental ratios in ocean biogeochemical models was tested using the Hawaii Ocean Time-Series data set from the subtropical North Pacific Ocean, where nutrient-starvation is a permanent condition for near-surface phytoplankton populations. Two three-element (C, N, P) ecosystem models were coupled to a mixed-layer model, an inorganic carbon chemistry model, and dynamic po...

Alfred Goldberg

system, where non-sexualised images, e.g. from clothes ads or even from nudist beaches get the green light, erotic posing counts as amber, and material focusing on genitals or actual acts of child abuse gets the red light. “We train the patient to move only in the green area,” Ahlers told the paper. “Amber means: Caution! Potential danger for children and for myself! Risky behaviour on the verg...

Alfred Sheen