The time constant of the exponential decay is equal to the inverse of the smallest eigenvalue of the Fokker-Planck equation. Furthermore, the switching time at the peak location of the distribution is a logarithmic function of the smallest eigenvalue. (c) 2009 American Institute of Physics. [DOI: 10.1063/1.3068620]“
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(i.e. flow) experienced by the cells and dose of the applied pharmacological agents. Microfluidic platforms have been applied extensively to create vascular systems in vitro; however, they

rely on bulky external hardware to operate, which hinders the wide application of microfluidic chips by non-microfluidic experts. Here, we have developed a standalone perfusion platform where multiple devices were perfused at a time with a single miniaturized peristaltic pump. JNJ-26481585 molecular weight Using the platform, multiple micro-vessel networks, that contained three levels of branching structures, were created by culturing endothelial cells within circular micro-channel networks mimicking the geometrical configuration of natural blood vessels. To demonstrate the feasibility of our platform for drug testing and validation RGFP966 inhibitor assays, a drug induced nitric oxide assay was performed on the engineered micro-vessel network using a panel of vasoactive drugs (acetylcholine, phenylephrine, atorvastatin, and sildenafil), showing both flow and drug dose dependent responses. The interactive effects between flow and drug dose for sildenafil could not be captured by a simple straight rectangular channel coated with endothelial cells, but it was captured in a more physiological branching circular network. A monocyte adhesion assay was also demonstrated with and

without stimulation by an inflammatory cytokine, tumor necrosis factor-alpha. (C) 2013 AIP Publishing LLC.”
“This paper describes a stripping method for the determination of oseltamivir (Tamiflu) at the submicromolar concentration level. This method is based on controlled adsorptive accumulation of oseltamivir at the thin-film mercury electrode followed by a linear cyclic scan voltammetry measurement of the surface species. Optimum experimental conditions consist of a NaOH solution (pH 7-8) as supporting electrolyte, an accumulation potential of -0.40 V, and a scan rate of 100 mV s(-1). The response of oseltamivir is linear over the concentration range from 0.0 – 0.5 ppm using lower accumulation time. When there was an accumulation time of 15 minutes, the detection limit was found to be 1.66 ppb (5.3 x 10(-9) mol L(-1)).