Abstract. A training and monitoring system has been developed to train spinal cord injured patients to relieve pressure intermittently from ischium while sitting in wheel chairs. The system automates the training of wheelchair push-ups based on certain con ditioning principles. The system reminds the patient to do a push-up of a specified duration and at specified intervals. The frequency and the duration of the push-ups are monitored providing information about performance of the patients, especially when the alarms to remind the patients are disconnected. A long-term study is in hand to assess the effectiveness of the system.

Summary. The preparation of antisera to human mycoplasmas and their use when dried on paper discs are described. The discs were tested in 6 diagnostic laboratories in parallel with locally prepared wet discs as controls. In all 138 mycoplasma strains were examined. Wet and dry discs gave essentially identical results in all but 5% of cases. The dried discs had a shelf life of at least 2 years.

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