Perception of light

The barrier to isomerization of rhodopsin in the dark is physiologically important because it limits the noise in our perception of light. If the barrier were low enough to be overcome thermally, discrimination of light from dark would be more difficult. 

The scientific potential of nuclear gamma-ray astronomy is outlined in section 2. In sections 3 instruments for spectroscopy in the low and medium gamma-ray channel are presented modulating aperture systems, Compton telescopes and diffraction lens telescopes. The three techniques actually reflect our current perception of light itself - they are based on the principles of geometrical optics, quantum optics and wave optics, respectively. 

The perception of light is one of the fundamental experiences of living beings and its power to reveal the world has always been recognized. In Genesis, creation of matter is immediately followed by creation of light that allows to detect the created world through its forms and colors ... 

Membranes also control the flow of information between cells and their environment. They contain specific receptors for external stimuli. The movement of bacteria toward food, the response of target cells to hormones such as insulin, and the perception of light are examples of processes in which the primary event is the detection of a signal by a specific receptor in a membrane. In turn, some membranes generate signals, which can be chemical or electrical. Thus, membranes play a central role in biological communications. 

Color vision (differential perception of light with different wave lengths). Loss of sensitivity to shorter wavelengths resulting in reduced ability to discriminate blues, greens and violets Responses to color coded displays may be affected Botwinick (1984) Charman (1997) Wood (2002)... 

Larue, C., and H. H. Cohen. Consumer Perception of Light Truck Safety. Proceedings of the Human Factors Society 34th Annual Meeting, 1990,589-590. 

When electromagnetic radiation with wavelengths between 800 and 400 nm hits the human retina, a chain of events is initiated which eventually results in the excitation of the visual nerve and the perception of light or colour in the brain. The molecular basis for this process is the photoreceptor protein rhodopsin, which forms part of the membrane layers inside the cone and rod cells of the retina. The... 

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