Improved measurement of the reactor antineutrino flux and spectrum at Daya Bay

published_or_final_versio

Measurement of electron antineutrino oscillation based on 1230 days of operation of the Daya Bay experiment

published_or_final_versio

Improved Search for a Light Sterile Neutrino with the Full Configuration of the Daya Bay Experiment

published_or_final_versio

Limits on active to sterile neutrino oscillations from disappearance searches in the MINOS, Daya Bay, and bugey-3 experiments

Searches for a light sterile neutrino have been performed independently by the MINOS and the Daya Bay experiments using the muon (anti)neutrino and electron antineutrino disappearance channels, respectively. In this Letter, results from both experiments are combined with those from the Bugey-3 reactor neutrino experiment to constrain oscillations into light sterile neutrinos. The three experiments are sensitive to complementary regions of parameter space, enabling the combined analysis to probe regions allowed by the Liquid Scintillator Neutrino Detector (LSND) and MiniBooNE experiments in a minimally extended four-neutrino flavor framework. Stringent limits on sin^2 2θμe are set over 6 orders of magnitude in the sterile mass-squared splitting Δm^2 41. The sterile-neutrino mixing phase space allowed by the LSND and MiniBooNE experiments is excluded for Δm^2 41 < 0.8 eV^2 at 95% CLs

The detector system of the Daya Bay reactor neutrino experiment

postprin

A novel two-stage continuous process for excretive expression of hEGF by recombinant E-coli JM101

In a continuous two-stage process, the first stage was a three-phase fluidized-bed bioreactor. Using polyurethane foam (PUF) as the cell-immobilization support matrix, the recombinant Eshcherichia coli cells were partially immobilized in the PUF matrix. The free cells were produced by fast regeneration of E. coli cells, and entered the second bioreactor, which was a bubble column, for inducing hEGF expression. By this novel process, each stage could be optimized and hEGF expression was enhanced. The effect of dilution rate on cell growth and hEGF expression was evaluated. The results indicated that the hEGF productivity was proportional to the dilution rate when D < 0.2 h(-1), but decreased when D > 0.2 h(-1). At D = 0.2 h(-1) hEGF productivity reached 31.2 mg(h l)(-1) which was much higher than that in batch process. (C) 2003 Elsevier Ltd. All rights reserved