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Populations of several species of gregarine parasites within a single host species, the damselfly Ischnura verticalis , were examined over the course of 1 season at 4 geographic localities separated by a maximum distance of 9.7 km. Gregarines, having a life cycle with both exogenous and endogenous stages, are subject to a wide variety of selective pressures(More)
Instruction of innovative engineering design skills has been identified as an important goal for engineering educators. Some universities choose to delay the design content of their curriculum until the senior year, when the designers can utilize the engineering concepts learned in lectures. This delay is unnecessary as the skills needed for innovative(More)
We describe the development of a bolometric receiver designed to measure the arcminute-scale polarization of the cosmic microwave background (CMB). The Polatron will be mounted at the Cassegrain focus of the 5.5 m telescope at the Owens Valley Radio Observatory (OVRO). The receiver will measure both the Q and U Stokes parameters over a 20% pass-band(More)
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