BACKGROUND/AIMS The MacuScope uses a psychophysical technique called heterochromic flicker photometry to measure macular pigment optical density (MPOD). Our aim was to determine the measurement variability (noise) of the MacuScope. METHODS Thirty-eight normally sighted participants who ranged in age from 19 to 46 years (25.7+/-7.6 years) were recruited from staff and students of Aston Univers...

BACKGROUND Access to health services is in part defined by the spatial distribution of healthcare equipment. To ensure equity in the provision of health services, it is important to examine availability across different health care providers taking into account population demand. Given the importance of the equitable provision of health equipment, we evaluate its spatial distribution in Brazil....

\\THILE SCANNING teclinics for paper electrophoretograms ai’e available, the introduction of new and varied electrophoretic systems (agar gel and starch gel) begets the necessity for more versatile scanning and qualltitating devices. One instrument that seems to fulfil this need is a commercially available automatic recording and integrating densitometer*; a prototype of the present model was d...

The Nelson-Somogyi assay for reducing sugars was adapted to microtiter plates. The primary advantages of this modified assay are (i) smaller sample and reagent volumes, (ii) elimination of boiling and filtration steps, (iii) automated measurement with a dual-wavelength scanning TLC densitometer, (iv) increased range and reproducibility, and (v) automated colorimetric readings by reflectance rat...

• Since the early studies by Hamilton, Werko, and Doyle, and their colleagues, a variety of indicator dilution techniques have been developed for measuring the cardiac output in man. The most widely accepted have been those requiring the use of the continuously recording cuvette densitometer." Numerous studies have appeared to demonstrate close correlation of values by the Hamilton and by the s...

An inexpensive, high-speed densitometer made from an Apple II computer, a black-and-white video camera, and an image digitizing board is described. By supplementing the computer with a very fast coprocessor, one can obtain a measurement of a typical thin-layer spot in 30-40 s. Only minimal electronic expertise is required for assembling the system from the commercially available components. Coe...