The Florida retinal densitometer

A densitometer for quantitative autoradiography.

A low cost spot densitometer system is described. This system is useful for quantitative autoradiography of local cerebral glucose utilization, blood flow, receptor binding and other applications requiring densitometry on films. The densitometer can be used alone or interfaced to a microcomputer. The densitometer consists of a photographic enlarger, a digital multimeter, and the densitometer el...

Clinical evaluation of the MacuScope macular pigment densitometer.

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...

Use and application of the cuvette densitometer as an oximeter.

A Photoelectric Densitometer for Use with Suspensions

A device for quickly and accurately measuring the population density of a suspension of microorganisms, permitting the preparation of yeast suspensions of known density to within 1 per cent error, was constructed with two Visitron photoelectric cells, a single light of high intensity and a good Wheatstone bridge for balancing the currents from the two photoelectric cells. A large Pyrex milk cul...

Ganglion cell distribution and retinal resolution in the Florida manatee, Trichechus manatus latirostris.

The topographic organization of retinal ganglion cells was examined in the Florida manatee (Trichechus manatus latirostris) to assess ganglion cell size and distribution and to estimate retinal resolution. The ganglion cell layer of the manatee's retina was comprised primarily of large neurons with broad intercellular spaces. Cell sizes varied from 10 to 60 μm in diameter (mean 24.3 μm). The re...