413 research outputs found
Dirofilaria immitis in the Wild Canids of Illinois
The heartworm, Dirofilaria immitis, is widespread in dogs in North America and has been reported in wild canids in many states. This is a report of this parasite in hearts removed from coyote, red fox and gray fox carcasses collected in Illinois. A total of 415 coyotes had a significantly higher infection rate (23.6%) than 225 red foxes (3.6%) and 99 gray foxes (3.0%). Infection rates in red foxes and coyotes were significantly higher in or near the Wabash Border Natural Division along the eastern side of the state, suggesting a relationship between infection rates and this region. The mean number of worms in coyotes (8.1), red foxes (6.8) and gray foxes (1.3) did not differ significantly. Coyotes supported a maximum of 52 worms; red foxes, 21 worms; and gray foxes, 2 worms. An exponential decrease in the number of infected coyotes was noted as worm loads increased; 56.5% of 85 infections consisted of one to four worms, while only 16.5% of the infections had 15 or more worms. The percentage of the coyote sample with the potential to provide microfilariae to vectors (13.1%), based on the presence of both male and female worms, was significantly greater than the same parameter for both red foxes (1.3%) and gray foxes (1.0%)
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Rf Voltage Modulation At Discrete Frequencies With applications To Crystal channeling Extraction
RF voltage modulation at a finite number of discrete frequencies is described in a Hamiltonian resonance framework. The theory is applied to the problem of parasitic extraction of a fixed target beam from a high energy proton collider, using a bent crystal as a thin ``septum`` within an effective width of about one micron. Three modes of employment of discrete resonances are proposed.First, a single relatively strong static ``drive`` resonance may be used to excite a test proton so that it will penetrate deeply into the channeling crystal. Second, a moderately strong ``feed`` resonance with a ramped modulation tune may be used to adiabatically trap protons near the edge of the beam core, and transport them to the drive resonance. Third, several weak resonances may be overlapped to create a chaotic amplitude band, either to transport protons to the drive resonance, or to provide a ``pulse stretching`` buffer between a feed resonance and the drive resonance. Extraction efficiency is semi- quantitatively described in terms of characteristic ``penetration,`` ``depletion,`` and ``repetition`` times. simulations are used to quantitatively confirm the fundamental results of the theory, and to show that a prototypical extraction scheme using all three modes promises good extraction performance
Studying gap junctions with PARIS: A new genetically encoded system manipulates the ph inside cells to detect whether they are coupled to each other
[No abstract available
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