A study of the influence of sustained, visual near-work upon a set of oculomotor functions (ZCSV i.e. Zone of Clear Single Vision) was carried out on a randomly drawn group (N = 43) of young, female, healthy and experienced accountants (mean age 24.6 years) who were daily engaged in full-time interactive VDT work. PRA (Positive Relative Accommodation), NRA (Negative Relative Accommodation), PRC...

PURPOSE To evaluate myopia prevalence, myopia progression, and various potential myopia risk factors in third-year law students. DESIGN Cross-sectional study and survey. PARTICIPANTS One hundred seventy-nine third-year law students at the University of Pennsylvania. METHODS We administered a questionnaire to assess the prevalence of myopia, myopia progression, and risk factors, including ...

of its annual member nomination campaign. More than 4000 members participated in the campaign. William D. Carey, executive officer, drew the winning entry at Association headquarters in Washington, D.C., on 13 March. Pella has been a AAAS member for 2 years and is a member ofthe AAAS Resource Group of Scientists and Engineers with Disabilities. His research areas are in neutron-knockout reactio...

Myopia has a multifactorial etiology, although environmental factors are predominant in determining its current patterns. Currently, associations between near work activities and myopia have not been consistently observed. Therefore, we performed a systematic review to quantify the effect of near work activities on myopia in children. Relevant articles published between 1989 and 2014 were ident...

We present a work-stealing algorithm for runtime scheduling of dataparallel operations in the context of shared-memory architectures on data sets with highly-irregular workloads that are not known a priori to the scheduler. This scheduler can parallelize loops and operations expressible with a parallel reduce or a parallel scan. The scheduler is based on the work-stealing tree data structure, w...

A single molecule of F1-ATPase is by itself a rotary motor in which a central gamma-subunit rotates against a surrounding cylinder made of alpha3beta3-subunits. Driven by the three betas that sequentially hydrolyse ATP, the motor rotates in discrete 120 degree steps, as demonstrated in video images of the movement of an actin filament bound, as a marker, to the central gamma-subunit. Over a bro...