The dissociative recombinations of

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Localizationof Pasteurella pneumotro pica was investigated in the respiratory tract, conjunctiva and vagina of 5-week-old, 10-week-old and retired asymptomatic mice and rats.The highest isolation rate of the organisms was obtained in the pharyngolarynx, showing 85 to 97.5% in carrier mice and 100% in carrier rats. Numbers of the organisms in this site were 103-5 and 107-8 organisms/g tissue in 4-week-old mice and rats, respectively. Isolation rates in the nasal cavity and trachea of the both animals were not so high as those in the pharyngolarynx, but usually higher than those in the external nares.The organisms were rarely isolated from the lung.Isolation of the organisms from the conjunctiva was common in rats, especially in young ones, but rare in mice. About 30% of carrier mice and 50 to 100% of carrier rats harbored the organisms in their vaginas.

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An electrostatic ion trap was designed for the study of vibrational states of molecular ions. The trap consists of two einzel lenses and two parallel-plate reflectors. An optical model analogous to this trap predicts that a range of focal lengths of lenses exists where ions can be stored irrespective of the reflector's focal length. Beam tests with 1.2-keV ion beams showed that ions can be stored in this range. That storage time is 0.1 s for an Ar þ beam at a vacuum pressure of 2 Â 10 À8 Torr.