BACKGROUND The popular methods for evaluating the initial therapeutic effect (ITE) of noninvasive positive pressure ventilation (NPPV) can only roughly reflect the therapeutic outcome of a patient's ventilation because they are subjective, invasive and time-delayed. In contrast, vibration response imaging (VRI) can monitor the function of a patient's ventilation over the NPPV therapy in a non-i...

A model of Drosophila circadian rhythm generation was developed to represent feedback loops based on transcriptional regulation of per, Clk (dclock), Pdp-1, and vri (vrille). The model postulates that histone acetylation kinetics make transcriptional activation a nonlinear function of [CLK]. Such a nonlinearity is essential to simulate robust circadian oscillations of transcription in our model...

BACKGROUND-Variations in the ventricular response interval (VRI) during atrial fibrillation (AF) may be reduced in patients with adverse clinical outcomes. The properties of VRI dynamics associated with prognosis remain undetermined. METHODS AND RESULTS-In 107 patients with chronic AF (age, 64+/-9 years), we analyzed a 24-hour ambulatory ECG for VRI variability (SD, SD of successive differences...

The utility scale of non-conventional generators (NCGs), such as wind and photovoltaic (PV) plants, are competitive alternatives to synchronous machines (SMs) for power generation. Higher penetration NCGs has been respondent causing several recent incidents leading up voltage collapse in systems due the distinct characteristics under different operating conditions. Consequently, so-called syste...

We identified a novel regulatory loop within Drosophila's circadian clock. A screen for clock-controlled genes recovered vrille (vri), a transcription factor essential for embryonic development. vri is expressed in circadian pacemaker cells in larval and adult brains. vri RNA levels oscillate with a circadian rhythm. Cycling is directly regulated by the transcription factors dCLOCK and CYCLE, w...

In this paper we study different factors that affect vector quality. Noise level, cleaning method, and vectorization software are three factors that may influence the resulting vector data. Real scanned images from GREC’03 contest are used in the experiment. Three different levels of salt-and-pepper noise (5%, 10%, and 15%) are used. Noisy images are cleaned by six cleaning algorithms and then ...

The Drosophila circadian oscillator is composed of autoregulatory period/timeless ( per/tim) and Clock (Clk) feedback loops that control rhythmic transcription. In the Clk loop, CLOCK-CYCLE heterodimers activate vrille (vri) and PAR domain protein 1 (Pdp1 ) transcription, then sequential repression by VRI and activation by PDP1 mediate rhythms in Clk transcription. Because VRI and PDP1 bind the...

This study examines the use of leaf area index (LAI) to inform variable-rate irrigation (VRI) for irrigated alfalfa (Medicago sativa). LAI is useful predicting zone-specific evapotranspiration (ETc). One approach toward estimating utilize relationship between and visible vegetation indices (VVIs) using unmanned aerial vehicle (UAV) imagery. research has three objectives: (1) measure describe wi...

When Amphiuma red cells are shrunken in hypertonic media, they return toward their original volume by gaining Na through an amiloride-sensitive pathway. As cells recover their volume during this volume-regulatory increase (VRI) response, acid is extruded into the medium. Medium acidification is correlated with cell Na uptake. Both medium acidification and cell Na uptake are blocked by 10(-3) M ...