منابع مشابه
Red-green flicker photometry and nonlinearities in the flicker electroretinogram.
We investigated whether responses from different cone classes are combined before or after the nonlinearity that is responsible for generating nonlinear response components of the flicker electroretinogram (ERG). We measured the nonlinear response of the retina while systematically varying the modulation in the long-wavelength-sensitive and middle-wavelength-sensitive cones by changing the prop...
متن کاملFlux calibration of the Herschel -SPIRE photometer
We describe the procedure used to flux calibrate the three-band submillimetre photometer in the Spectral and Photometric Imaging Receiver instrument on the Herschel Space Observatory. This includes the equations describing the calibration scheme, a justification for using Neptune as the primary calibration source, a description of the observations and data processing procedures used to derive f...
متن کاملSerum Calcium Using the Eel Flame Photometer
Flame photometry has many applications, and in the clinical field its use in the estimation of serum sodium and potassium is now well established. Difficulties have been encountered in the estimation of serum calcium by flame photometry, since the emission spectrum of calcium is relatively weak and is subject to interference by the presence of other ions, e.g., sodium. Although many methods hav...
متن کاملThe Peripheral Flicker Illusion
A new illusion is reported. A visual object suddenly appearing on a red background sometimes causes an impression of flicker or double flash. In Experiment 1, a red, green, or blue object was presented on a red, green, blue, or gray background. Participants evaluated the illusion strength in reference to the physical flicker of a gray object presented in central vision. The results show that th...
متن کاملThe nitroglycerin-flicker test.
The nitroglycerin-flicker test, as suggested and modified by Krasno and Ivy, has been used to test normal individuals and patients with a variety of cardiovascular diseases. The hypothesis that this test would serve as an index of the presence of vascular disease or spasm elsewhere in the body than the retina was explored. These studies have failed to justify the drawing of conclusions based on...
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ژورنال
عنوان ژورنال: Science
سال: 1898
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.8.183.11