Background: Heroin is an extremely addictive narcotic drug derived from morphine. Its continued use requires increased amounts of the drug to achieve the same effect, resulting in tolerance and addiction. This study was done in order to determine the prevalence of musculoskeletal pain and forward head posture among heroin users during their withdrawal. Methods: This research was a cross-section...

[Purpose] This study compared the forward head angle and the lumbar flexion and rotation angles of computer workers using routine and fixed computer workstations. [Subjects] Ten male workers voluntarily consented to participate in the study. [Methods] A 3-D motion analysis system was used to measure the angles of the forward head and lumbar flexion. All subjects performed computer work for 30 m...

It is widely accepted that the vesicle-transporter myosin-V moves processively along F-actin with large steps of approximately 36 nm using a hand-over-hand mechanism. A key question is how does the rear head of two-headed myosin-V search for the forward actin target in the forward direction. Scanning probe nanometry was used to resolve this underlying search process, which was made possible by ...

Myosins are ATP-driven linear molecular motors that work as cellular force generators, transporters, and force sensors. These functions are driven by large-scale nucleotide-dependent conformational changes, termed "strokes"; the "power stroke" is the force-generating swinging of the myosin light chain-binding "neck" domain relative to the motor domain "head" while bound to actin; the "recovery ...

— The EEG forward problem involves computing the scalp potentials at a finite set of electrode locations for a source configuration in a specified volume-conductor head model. Brain electrical activity spreads (spatially) over the whole head volume conductor. However, under certain circumstances, it is possible to limit the volume within which the study can be done, thus reducing model size. As...

An experiment to assess psychomotor performance before and after forward-facing (-Gx) impact was conducted using the AFAMRL Horizontal Decelerator Facility. There were 10 volunteer subjects who participated in 50 tests at 4 impact levels (0 G or sham, 8 G, 10 G, and 12 G). Two initial head positions were explored at the highest impact level. The manikin psychomotor task, a complex reaction time...