RESUMO
Angular motion of a hand-held instrument due to physiological tremor during micromanipulation tasks was recorded with a six degree-of-freedom accelerometer-based sensing unit placed in the instrument. Methods to get angular velocities and angular accelerations from the acceleration readings of accelerators in the sensing unit are described. Statistics of angular velocity and angular acceleration of the instrument due to the tremor obtained from ten normal subjects are reported. Assumption of very small tremor angular velocities in micromanipulation tasks to calculate tremor angular accelerations analytically is validated.
Assuntos
Micromanipulação/instrumentação , Micromanipulação/estatística & dados numéricos , Tremor/fisiopatologia , Aceleração , Engenharia Biomédica , Humanos , Microcirurgia/instrumentação , Microcirurgia/estatística & dados numéricos , Modelos Biológicos , Modelos Teóricos , Movimento (Física) , Instrumentos CirúrgicosRESUMO
Large accumulations of sphingomyelin and bis(monoacylglycero)phosphate were found in the spleen of a child, who died from a lipidosis (Morbus Niemann-Pick). The enrichment of both phospholipids in this organ was more extensive than in liver. Moreover: bis(monoacylglycero)phosphate, the lipid characteristic for lysosomes, had a remarkably high content of oleic acid: 76% in spleen and 63% in liver.
