Mindblown: a blog about philosophy.

The response of plants to the relative lengths of day and night. The periodic occurrence of biological phenomena in relationship to the presence or absence of light. In most animals, the sleep-wake cycle is a form of photoperiodism.  

A photograph of the minute characteristics of a specimen made through a microscope. Photographic record of an object in a microscopic field taken by attaching a camera to a microscope. An enlarged photographic record of an object taken through an optical or electron microscope. A photograph of an object under a microscope.  

An eyeglass lens that lightens or darkens depending upon the amount of light that is present.  

A term applied to the lens of some eyeglasses that lighten or darken in response to the amount or intensity of ultraviolet light that is present, photogrey.  

The chemically uniting of gaseous products in the atmosphere into irritating compounds with the sun’s action as a chemical catalyst photochemical.  

Refers to the effect that radiant energy has in producing chemical changes, photochemical smog.  

An immune reaction caused by light rays changing medications in the blood to allergic substances. A contact dermatitis produced by the interaction between ultraviolet light rays and topically applied chemicals such as sunscreens, perfumes, phenothiazines, sulfonamides, and some components in soaps. Sunlight changes the structure of these chemicals, causing them to become allergens. An eczematous…

A creatine-phosphoric acid compound that occurs in muscle is the energy source in muscle contraction, creatinine. Phosphate form of the muscle protein creatine, which is used as an energy source for muscle flexion. A compound found in muscle. It is important as an energy source, yielding phosphate and creatine in this process, and releasing energy…

A phospholipid that is widely distributed in the body, in the brain and spinal cord.