Adam Engelhart

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Ferrets, mammalian carnivores, kept in an indoor enclosure were continuously exposed to low concentrations of polychlorinated biphenyls (PCBs) in the ambient air for 5 years. After that time PCB concentrations were quantified in the olfactory bulbs and in the remaining brain, adipose tissue and liver. The results revealed unexpectedly high PCB(More)
As computing systems grow in complexity, the cluster and grid communities require more sophisticated tools to diagnose, debug and analyze such systems. We have developed a toolkit called MAGNET (Monitoring Apparatus for General kerNel-Event Tracing) that provides a detailed look at operating-system kernel events with very low overhead. Using the(More)
Oscilloscopes and their cousins, logic analyzers, are the tools of choice for difficult electronic hardware problems. In the hands of a skilled engineer or technician, these tools can be used to solve stubborn problems. The key to the utility of oscilloscopes is the depth of detail they provide and their flexibility, which allows the level of detail to be(More)
Summary form only given. The performance of TCP in wide-area networks (WANs) is becoming increasingly important with the deployment of computational and data grids. In WAN environments, TCP does not provide good performance for data-intensive applications without the tuning of flow-control buffer sizes. Manual adjustment of buffer sizes is tedious even for(More)
In Europe polecat populations are declining for unknown reasons during the last decades. Data on the river otter, another mustelid predator, indicate that PCB levels are high enough in some populations to interfere with the reproduction of this aquatic species. Since the diet of the polecats consists to a large amount of aquatic prey (amphibians) it appears(More)
The concentrations of non-ortho, mono-ortho and di-ortho substituted PCB congeners in tissues of three European mustelid species--polecat, stone marten and badger--were determined. Median congener concentrations are comparable in the three species and are lower than in previous studies on polecats. In all samples PCB-126 contributes most to the TCDD-TEQ; it(More)
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