photo-, phot-, -photic +

A directed response of a motile organism to color or a light pattern stimulus.

1. Excessive growth caused by the action of light.
2. Hyponasty which is the result of exposure to intense light following an arrest of growth.

Initiated through exposure to light.

1. Movement in response to light.
2. A change in the rate of motion in response to light, as an increase or decrease in motility of bacteria with a change in illumination.
3. The change in movement or activity by an organism as a response to light.

A device for moving film at a constant speed so that a continuous record of a physiologic event may be obtained, as by a beam of light shining on the film.

Having the property of being broken down by light or by ultraviolet radiation.

A reference to the lethal effects of light.

Plants and other organisms that use photosynthesis as a source of nutrition.

The art or process of producing, by photography, designs upon lithographic stone (or a similar substance), from which prints may be taken as in ordinary lithography; especially, a planographic printing process using plates prepared from photographic negatives, usually printed by offset methods.

1. A branch of physics that deals with light or the study of light and its effects.
2. That science concerned with the production of light and energy; especially, regarding therapeutic applications.

1. The emission of light from a substance as a result of the absorption of electromagnetic radiation. The frequency of the light emitted is lower than that which is absorbed.
2. Luminescence caused by visible light or by infra-red or ultraviolet radiation.
3. Luminescence caused by exposure to light. In lower vertebrates it results from the reflection of light by iridophores in the skin.
4. The quality of being luminescent after being exposed to light or other electromagnetic radiation.

1. The decomposition of a substance into simpler units as a result of its absorbing light; such as, the separation of hydrogen from hydrogen sulfide in water.
2, Any process in which radiant energy produces a chemical change.

1. Referring to the chemical decomposition or change by the action of light or other form of radiant energy.
2. Relating to decomposition by the influence of light upon organisms.

The sensation of seeing light flashes.

1. A technique for investigating and recording conditions and procedures involving small objects that ordinarily would be inspected through a loupe rather than a microscope.
2. Close-up photography at a limiting magnification of 40 times, or in that zone.