Abstract: Sensor systems and methods are disclosed, which generally incorporate isolation between the sensor's electronics and the sensed media. The sensor's electronic circuit can incorporate one or more application specific integrated circuit (ASIC) that processes and outputs the signal for both absolute and differential measurements. Such a sensor can be adapted for use in exhaust gas re-circulation (EGR) systems utilized with automotive gasoline engines. Such a sensor can also be utilized for measuring differential pressure across diesel particular filters and/or applications in which differential pressure is required for system control and/or monitoring purposes. The absolute pressure sensor disclosed herein can therefore sense the exhaust pressure on automotive engines and other mechanical and/or electromechanical devices and machines.

Abstract: The present invention relates to a live cytadherence-deficient M. gallisepticum strain that does not express at least two of three proteins, the Gap-A molecule, crnA protein, and the 45 kDa protein, expressed by wildtype M. gallisepticum Strain R and its use as a vaccine for preventing and protecting birds, especially chickens and turkeys against the respiratory diseases attendant with wildtype Mycoplasma gallispeticum infection. The invention also relates to the use of the vaccine as a vector for the delivery of genes encoding protective antigens from other bacterial and viral avian pathogens, such as avian influenza virus. There is also disclosed a method for identifying the attenuated cytadherence-deficient M. gallisepticum Rhigh or a strain thereof.