Ileal intussusception and obstruction as presentation of inflammatory fibroid polyp.
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Humans↗
Biomedical subjects
K Glick
Publications and source records attributed to K Glick.
Automatic tachycardia recognition.
A microcomputer algorithm for tachycardia identification, suitable for use in an implanted antitachycardia pacemaker, is described. The system employs an atrial and ventricular electrogram, detects a sustained fast rate in either chamber, and awakens the main program to perform detailed analysis of the tachycardia and its immediately preceding beats. The algorithm distinguishes atrial, ventricular, and AV nodal and re-entrant tachycardia from high rates due to sinus tachycardia. For testing of the program, we used a data base of twenty-two tape-recorded and documented arrhythmias provoked during electrophysiologic studies in which atrial and ventricular bipolar electrodes were in place; twenty-one were successfully detected. These included atrial fibrillation, atrial flutter, atrial tachycardia, AV nodal re-entrant tachycardia, AV re-entrant tachycardia using an accessory pathway, and ventricular tachycardia with and without ventriculo-atrial conduction.
Atrial Fibrillation↗
Uridine diphosphate glucose-sterol glucosyltransferase and nucleoside diphosphatase activities in etiolated pea seedlings.
1. UDP-glucose-sterol glucosyltransferase and nucleoside diphosphatases were isolated in a particulate fraction from 7-day-old etiolated pea seedlings. The glucosyltransferase and UDPase (uridine diphosphatase) are stimulated by Ca2+ cation, less so by Mg2+ cation, and inhibited by Zn2+. 2. Each activity has a pH optimum near 8. 3. The glucosyltransferase is specific for UDP-glucose as the glucosyl donor and is inhibited by UDP. Partial recovery from UDP inhibition is effected by preincubation of the enzyme. 4. Freeze-thaw treatment and subsequent sucrose-density-gradient centrifugation of the particulate fraction shows the glucosyltransferase to be widely distributed among cell fractions but to be most active in particles with a density of 1.15 g/ml. UDPase is most active in particulate material with a density of over 1.18 g/ml but an activity peak also appears at 1.15 g/ml. Of several nucleoside diphosphatase activities, UDPase activity is most enhanced by the freeze-thaw and sucrose-density-gradient-fractionation procedures. 5. Detergent treatment with 0.1% sodium deoxycholate allows the partial solubilization of the glucosyltransferase and UDPase. The two activities are similarly distributed between pellet and supernatant after high-speed centrifugation for two different time intervals. 6. A role for UDPase in the functioning of glucosylation reactions is discussed.
Acid Anhydride Hydrolases↗