Alteration of the pathogenicity of Pasteurella pneumotropica for the murine lung caused by changes in pulmonary antibacterial activity

Pasteurella pneumotropica is a potential pulmonary pathogen in mice. In healthy animals, this organism was killed rapidly by the normal function of the intrapulmonary phagocytic defense mechanisms. Impairment of this bactericidal activity by the acute renal failure of nephrectomy resulted in multiplication of the Pasteurella in the lung, both when the animals were nephrectomized first and then infected, and when the animals were infected first and nephrectomized several hours after the infection. The study demonstrates that the pathogenicity of the Pasteurella organisms is governed by the functional state of these pulmonary antibacterial mechanisms.

Mechanisms of antibacterial action in the respiratory system

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Some comments upon current optical shop practices

The fabrication of optical elements began as an art rather than a science and has tended to remain so throughout its history. Today's methods are largely extensions of the original techniques. With spaceage demands for rapid response as well as quality, some effort is being made to remove optical technology from the realm of wizardry by standardizing fabrication procedures and associated working materials. However, the diversity of problems encountered in modern optical fabrication requires a flexibility of approach which indicates that the artisan will always be with us. Examples of some optical fabrication and testing procedures employed at the Goddard Space Flight Center are presented.

A simplified method for diagnosing group A beta hemolytic streptococci

This office technic makes possible the identification of group A beta hemolytic streptococci within eight to 24 hours. De signed by men in private practice for fast, accurate results, this method has been used in 700 successive throat cultures from patients seen in the authors' office.