Porous graphitic carbon (PGC) is an important tool in a chromatographer's armory that retains polar compounds with mass spectrometry (MS)-compatible solvents. However, its applicability is severely limited by an unpredictable loss of retention, which can be attributed to contamination. The solutions offered fail to restore the original retention and our observations of retention time shifts of ...

The Drosophila embryonic Central Nervous System (CNS) develops from the ventrolateral region of the embryo, the neuroectoderm. Neuroblasts arise from the neuroectoderm and acquire unique fates based on the positions in which they are formed. Previous work has identified six genes that pattern the dorsoventral axis of the neuroectoderm: Drosophila epidermal growth factor receptor (Egfr), ventral...

Single-axis vibrotactile feedback of trunk tilt provided in real-time has previously been shown to significantly reduce the root-mean-square (RMS) trunk sway in subjects with vestibular loss during single-axis perturbation. This research examines the effect of multi-directional vibrotactile feedback on postural sway during continuous multi-directional surface perturbations when the subjects' ey...

The present study asks in what way the activity of a neuronal population responding to a sensory stimulus could be most efficiently decoded, or 'read off', by the target neurons. A simple solution to this problem has been proposed - pooling the activity of responding neurons. However, pooling can be inefficient if sensory information is encoded by the 'label' of each neuron firing a spike. We h...

BACKGROUND Size exclusion chromatography is the method of choice for separating free from liposome-encapsulated molecules. However, if the column is not presaturated with lipids this type of chromatography causes a significant loss of lipid material. To date, the mechanism of lipid retention is poorly understood. It has been speculated that lipid binds to the column material or the entire lipos...

The stability of plasma-based accelerators against transverse misalignments and asymmetries the drive beam is crucial for their applicability. Without stabilizing mechanisms, even small initial offsets centroid can couple coherently to plasma wake, grow, ultimately lead emittance degradation or loss a trailing witness beam. In this work, we demonstrate intrinsic propagating in column. This resu...

PURPOSE To compare the orientation column maps elicited by different spatial frequency gratings in cortical area 17 of cats before and during brief elevation of intraocular pressure (IOP). METHODS IOP was elevated by injecting saline into the anterior chamber of a cat's eye through a syringe needle. The IOP was elevated enough to cause a retinal perfusion pressure (arterial pressure minus IOP...

band, laparoscopic sleeve gastrectomy, and Roux-en-Y gastric bypass. Although these procedures have been shown to achieve sustained weight loss and decreased mortality and morbidity, they can also cause unintended effects on the esophagus involving gastroesophageal reflux disease and esophageal motility. Our endoscopy column also involves bariatric procedures. Dr Christopher C. Thompson discuss...

carotenoids are red, orange and yellow pigments, which are widely distributed in fruit and vegetables. the aim of this research is to investigate the effect of conventional, high pressure and microwave cooking on the concentrations of β-carotene in carrot and sweet corn. raw carrots were washed, peeled and diced to a uniform size and then frozen at -70°c. sweet corn was also provided in a simil...

A fast SPE-GC-ECD method for the analysis of PCBs in waste oil was developed. A complete profi le was obtained following SPE with a 12 minute GC run-time using a modular accelerated column heater (MACH). Full automation of the sample preparation and analysis (except sample weigh-in) enables a daily throughput of 100 samples. A wide range of concentrations can be determined using a dedicated col...