OBJECTIVES To conduct rapid assessments of avoidable blindness to estimate the magnitude and causes of blindness in people aged >/=50 years in Negros Island and Antique district, Philippines. METHODS Clusters of 50 people aged >/=50 years were sampled with probability proportionate to size. Households within clusters were selected through compact segment sampling. Visual acuity (VA) was measu...

The bacterium E. coli maneuvers itself to regions with high chemoattractant concentrations by performing two stereotypical moves: ‘runs’, in which it moves in near straight lines, and ‘tumbles’, in which it does not advance but changes direction randomly. The duration of each move is stochastic and depends upon the chemoattractant concentration experienced in the recent past. We relate this sto...

The bacterium E. coli maneuvers itself to regions with high chemoattractant concentrations by performing two stereotypical moves: ‘runs’, in which it moves in near straight lines, and ‘tumbles’, in which it does not advance but changes direction randomly. The duration of each move is stochastic and depends upon the chemoattractant concentration experienced in the recent past. We relate this sto...

PURPOSE To compare the visual responses of post refractive surgery's patients using Early Treatment Diabetic Retinopathy Study Chart (ETDRS) and E-chart with and without color filters. METHODS The uncorrected Logarithm of the Minimum Angle of Resolution Visual Acuity (LogMAR VA) of 70 patients with a mean age of 26.2 ± 3.76 years (from 19 to 34 years) who had undergone Photorefractive Keratec...

The influence of flexibility on the flight of autorotating winged seedpods is examined through an experimental investigation of tumbling rectangular paper strips freely falling in air. Our results suggest the existence of a critical length above which the wing bends. We develop a theoretical model that demonstrates that this buckling is prompted by inertial forces associated with the tumbling m...

as one of the potential ict application areas within organizations, e-learning has come within the sights of organizations for its plethora of possibilities. the most significant feature is that by using leading edge ict, e-learning helps organizations to chart the changes and create a kind of continued educatin within the corporate environment. the present study studies the challanges facing o...

This article reviews the growing body of research on electronic commerce from the perspective of economic analysis. It begins by constructing a new framework for understanding electronic commerce research, then identifies the range of applicable theory and current research in the context of the new conceptual model. It goes on to assess the state-of-the-art of knowledge about electronic commerc...

Locust can jump precisely to a target, yet they can also tumble during the trajectory. We propose two mechanisms that would allow the locust to control tumbling during the jump. The first is that prior to the jump, locusts adjust the pitch of their body to move the center of mass closer to the intended thrust vector. The second is that contraction of the dorsolongitudinal muscles during the jum...