Hence, it appears that in many cases physiological adaptation may be a direct response of the life-processes of the plant to the daily length of photochemical stimulation which it receives from solar light.
An image of external objects fixed on the retina by the photochemical action of light on the visual purple.
The production of an optogram on the retina by the photochemical action of light on the visual purple; the fixation of an image in the eye.
Defn: Of or pertaining to chemical action of light, or produced by it; as, the photochemical changes of the visual purple of the retina.
Defn: An image of external objects fixed on the retina by the photochemical action of light on the visual purple.
Defn: The production of an optogram on the retina by the photochemical action of light on the visual purple; the fixation of an image in the eye.
We know of no animal whose eyes, the organs, par excellence, of photochemical change, give off light in the dark.
We know that photochemical reactions are very little affected by temperature because the reaction is dependent on the absorption of light, a physical process, and this increases only a small per cent.
In the simplest unicellular forms certain structures within the cell serve as the photochemical detectors of light, while in luminous protozoa, similarly, granules scattered throughout the cell are oxidized with light production.
Photochemical reactions and chemiluminescent reactions do have this in common, however, that they are largely but not exclusively oxidations.
Although there is a multitude of reactions in photographic processes which are brought about by exposure to light, these represent relatively few of the photochemical reactions.
Certain kinds of radiant energy are required for photography and other photochemical processes and a vast array of colored light is demanded for displays and for effects upon the stage.
It is impossible to rate the different illuminants in a general manner as to actinic value because the various photochemical reactions are not affected to the same extent by rays of a given wave-length.
Visible and ultra-violet rays are the radiations almost entirely responsible for photochemical reactions, but the most active of these are the blue, violet, and ultra-violet rays.
Therefore, one illuminant may be superior to another for one photochemical reaction, while the reverse may be true in the case of another reaction.
In general, great intensities of blue light and of the closely associated rays are necessary for most photochemical reactions with which man is industrially interested.
The regular glass-tube mercury-arc is an efficient producer of the actinic rays and as a consequence has been extensively used in photographic work and in other photochemical processes.
Much study and experimentation were expended upon photochemical effects, especially with silver compounds, before Niepce developed a method of producing pictures which were subsequently unaffected by light.
In general, it may be said that the arc-lamps including the mercury-arcs provide the most active illuminants for photochemical processes; however, a large number of electric incandescent filament lamps are used in photographic work.
The foregoing are only a few of the multitude of photochemical reactions and other effects of radiant energy.
A million white flame-carbons are being used annually in this country for various photochemical processes.
Scheele's work aroused much interest in photochemicaleffects and many investigations followed.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "photochemical" in a variety of sentences. We hope that you will now be able to make sentences using this word.
