Cheap, handheld colorimeter to read paper-based diagnostic devices

Paper-based tuberculosis diagnostic devices with colorimetric gold nanoparticles

A colorimetric sensing strategy employing gold nanoparticles and a paper assay platform has been developed for tuberculosis diagnosis. Unmodified gold nanoparticles and single-stranded detection oligonucleotides are used to achieve rapid diagnosis without complicated and time-consuming thiolated or other surface-modified probe preparation processes. To eliminate the use of sophisticated equipme...

Screen printed paper-based diagnostic devices with polymeric inks.

A simple and low-cost fabrication method for paper-based diagnostic devices (PBDDs) is described in this study. Street-available polymer solutions were screen printed onto filter papers to create hydrophobic patterns for fluidic channels. In order to obtain fully functional hydrophobic patterns for fluids, the original polymer solutions were diluted with butyl acetate to yield a suitable viscos...

Paper-based microfluidic point-of-care diagnostic devices.

Dipstick and lateral-flow formats have dominated rapid diagnostics over the last three decades. These formats gained popularity in the consumer markets due to their compactness, portability and facile interpretation without external instrumentation. However, lack of quantitation in measurements has challenged the demand of existing assay formats in consumer markets. Recently, paper-based microf...

Bringing Streaming Video to Wireless Handheld Devices

In fact, video compression techniques like MPEG-4 and others are reducing the wireless bandwidth needed for streaming video. But there still remain other factors, which are just as critical as bandwidth, if not more so. Beyond bandwidth, the other half of the streaming video equation is the architecture and capabilities of the terminal device itself. Even if unlimited wireless bandwidth were su...

Bringing High-End Graphics to Handheld Devices