BACKGROUND Baroreceptor-mediated phasic changes in vagal tone have been hypothesized to cause ventriculophasic sinus arrhythmia (VPSA). The objectives of this study were to demonstrate ventriculophasic modulation of AV nodal conduction and to substantiate the role of the baroreflex on ventriculophasic AV nodal conduction (VPAVN) by pharmacological perturbation of parasympathetic tone. METHODS...

Localization within the space in front of an observer can be specified along two orthogonal physical dimensions: elevation ('up', 'down') and horizontal ('left','right'). For the erect observer, these correspond to egocentric dimensions along the long and short axes of the body, respectively. However, when subjects are rolled-to-horizontal (lying on their sides), the correspondence between the ...

Pitch-based AC beads (particle size about 1mm) were synthesized from coal tar pitch through the emulsion method without using binder material in our laboratory. Adsorption equilibrium and adsorption kinetics of CO2 and N2 on the activated carbon beads were studied experimentally and theoretically. Based on the equilibrium and kinetics data, an improved vacuum-pressure swing adsorption (VPSA) pr...

The rugose colonial variant of Vibrio cholerae O1 El Tor produces an exopolysaccharide (EPS) that enables the organism to form a biofilm and to resist oxidative stress and the bactericidal action of chlorine. Transposon mutagenesis of the rugose variant led to the identification of vpsR, which codes for a homologue of the NtrC subclass of response regulators. Targeted disruption of vpsR in the ...

The rugose colonial variant of Vibrio cholerae O1 El Tor produces an exopolysaccharide (EPS(ETr)) that enables the organism to form a biofilm and to resist oxidative stress and the bactericidal action of chlorine. Transposon mutagenesis of the rugose variant led to the identification of vpsR, which codes for a homologue of the NtrC subclass of response regulators. Targeted disruption of vpsR in...

As energy systems require flexible and responsive power generators to combat network imbalances, CO 2 post-combustion capture (PCC) technologies need be capable of transient operation. However, currently only amine absorption has been investigated for its efficacy in Flexible-PCC. Within this study we develop validate a vacuum-pressure swing adsorption (VPSA) process model, processing 33.8 kg/s...

The pressure swing adsorption (PSA) system is widely applied to separate and purify hydrogen from gaseous mixtures. extended Langmuir equation fitted the Langmuir-Freundlich isotherm has been used predict isothermal of methane on zeolite 5A adsorbent bed. A six-step two-bed PSA model for purification developed validated by comparing its simulation results with other works. effects pressure, P/F...

Hydrogen purification is an important part of hydrogen energy utilization. This study aimed to perform multi-component gas (H2/CO2/CH4/CO/N2 = 0.79/0.17/0.021/0.012/0.007) by one-column vacuum pressure swing adsorption (VPSA) and (PSA). AC5-KS was selected as the adsorbent for due its greater capacity compared R2030. Furthermore, VPSA PSA 10-step cycle models were established simulate process u...