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Various bovine ephemeral fever (BEF) vaccines were tested between 1982 and 1984 in 24 Queensland herds; neutralising antibody responses were monitored and six of the herds were closely observed following natural challenge with ephemeral fever. A vaccine regime of two consecutive vaccinations with
Multipoint foci have been synthesized by applying the pseudoinverse field conjugation method to a single ultrasonic transducer coupled to a polystyrene lens. The lens design is based on phased array calculations are then fabricated on a computer-controlled milling machine. The measured beam patterns
The complexity of quantitative biomedical models, and the rate at which they are published, is increasing to a point where managing the information has become all but impossible without automation. International efforts are underway to standardise representation languages for a number of
We studied the prevalence of rickettsialike organisms infection in different tick species (3154 adults) collected in several areas of the Ebro valley (Spain). The Gimenez stain showed a prevalence of rickettsia-like organisms in 38.6% of the studied ticks. Using the immunofluorescence assay, only
The penetration of RF energy into lossy material from an electrically small radiating aperture is theoretically almost independent of frequency and this is confirmed by measurement.