Preparation of cell walls and protoplasm of Neisseria with the Ribi cell fractionator

The varied pressures required for disruption of Neisseria gonorrhoeae and other species of Neisseria when the Sorvall-Ribi refrigerated cell fractionator is used in the preparation of cell walls and cellular protoplasm are reported. Optimal disruption pressure for the gonococcus was considerably less than that required for other members of the genus Neisseria. Pressures varied from 8,000 psi for N. gonorrhoeae F62, colony type 4, to 22,000 psi for the nonpathogenic Neisseria-N. sicca, N. flava, and N. catarrhalis. Representative electron photomicrographs are shown.

Eighteen-month retrospective study of Austin bunionectomy using single screw fixation

The authors present an 18-month follow-up of the Austin bunionectomy using a single 2.7-mm. American Society of Internal Fixation (ASIF) (Zimmer Corporation, Warsaw, IN) screw. Fifty-six feet in 41 patients were evaluated with data from clinical examination, radiographic data, and responses to a patient questionnaire. Early return to shoes, excellent range of motion, and 96% patient satisfaction were noted. Good reduction of the intermetatarsal and the hallux valgus angles were observed, and no aseptic necrosis was noted in the series.

Cardiovascular reactivity to psychological stress in aerobically trained versus untrained mild hypertensives and normotensives

Cardiovascular reactivity to video game and mental arithmetic stressors was compared among three groups of men: aerobically trained mild hypertensives, untrained mild hypertensives, and a comparison group of untrained normotensives. Relative to the untrained hypertensives, the trained hypertensives reacted to the video game with marginally smaller systolic blood pressure and diastolic blood pressure, but there were no significant differences between these groups in reactivity during the mental arithmetic task. Comparisons between each hypertensive group and the normotensive group showed that blood pressure (BP) reactivity of normotensives during the video game was generally similar to that of trained hypertensives but smaller than that of untrained hypertensives. These results indicate that aerobic training, which has been found to reduce resting BP in mild hypertensives, may also exert a favorable impact in reducing cardiovascular reactivity of hypertensives during some stressful situations.