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1. When a subject attempts to exert a steady pressure on a joystick he makes small unavoidable errors which, irrespective of their origin or frequency, may be called tremor.2. Frequency analysis shows that low frequencies always contribute much more to the total error than high frequencies. If the subject is not allowed to check his performance visually,(More)
1. Total root-mean-square (r.m.s.) error over an effectively unrestricted band, and error power spectra from 0.256 to 12.5 c/s were measured for four subjects attempting to maintain fixed forces of 1-6 Lb. (0.45-2.72 kg) on a pressure joystick. The subject could see his errors as the deflexion of a cathode ray tube spot.2. The total r.m.s. error increases(More)
Measurements of physiological signals have been used in many areas, including medical, sports, and automotive applications. Cardiac signals such as electrocardiogram (ECG) and heart rate variability (HRV) are particularly important, but conventional measurement techniques require wired devices and static subjects. These limitations preclude application of(More)
A modification of the method for monocyte isolation reported by Recalde (1984. J. Immunol. Methods. 69: 71-77) is described. Application of the modified method to 36 consecutive healthy adult donors gave a monocyte purity of 73 +/- 8% monocytes with less than 1% polymorphonuclear leukocytes and a yield of 3.44 +/- 0.93 x 10(5) monocytes/ml blood. While the(More)
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