actino-, actin-, actini-, -actinal, actis- +
(Greek: ray [as of light] or like a ray in form; radiance, radiation; a radiating or tentacled structure)
Some bacteria form actin tails to use for motility.3. Etymology: According to A Dictionary of Scientific Terms by I.F. Henderson (Isabella Ferguson) and W.D. Henderson; Edinburgh; Oliver and Boyd Publication, 1920; this word comes from Ancient Greek ἀκτίς, "ray", "a star-shaped spicule (zoology)" + the English chemical suffix -in, -ine.
All of the other "modern" medical dictionary sources that include this actin protein term do not make any references to any etymological origins.
2. Concerning the rays or tentacles of an animal: The starfish is a good example of an actinal aquatic animal having arms extending from its center.
Actinians don't form hard skeletal structures.
2. Regarding photochemical properties: Some actinic attributes are found in containers that protect them from photo-degradation.
3. Pertaining to or designating radiant energy: An actinic ray exists in the visible and ultraviolet spectrum which produces marked chemical changes.
"Actinic" is the adjective referring to ultraviolet (UV) rays from sunlight and UV lamps.
These actinic keratoses or solar keratoses are growths that are usually pink or red and appear as flaky, rough scaly patches or areas of skin and they may also be light gray or brown and feel hard, rough, or gritty.
2. Etymology: "actinic" is from Greek aktis, "ray" and refers to the ultraviolet rays, as in sunlight, that can cause reaction in the skin; so, a "sunbrn" is an actinic injury while keras is a Greek element for "horn".
Solar keratoses, or senile keratosis, is more common with fair skinned and elderly people and it may be a discrete, slightly raised, red-on-pink lesion located on a sun-exposed surface.
Such conditions can be prevented by decreasing oneself to sun exposure and by wearing sunscreen.
Actinic keratosis usually can be removed by freezing with liquid nitrogen (cryotherapy), however if a person has too many growths, a liquid or cream containing fluorouracil may be applied.
Often, during such treatment, the skin temporarily looks worse because fluorouracil causes redness, scaling, and burning of the keratoses and of the surrounding sun-damaged skin.
A relatively new drug, imiquimod, is useful in treating actinic keratosis because it helps the immune system to recognize and to destroy cancerous skin growths.
Another treatment includes cutting the keratosis away by burning them with photodynamic therapy by means of injecting ia chemical into the bloodstream that collects in the actinic keratoses and makes them more sensitive to destruction by a specialized form of light.
Some of the related chemical elements of the actinide series include actinium, thorium, palladium, uranium, neptunium, plutonium, americium, curium, berkelium, californium, einsteinium, fermium, mendelevium, nobelium, and lawrencium.
Actinium possesses no stable isotopes and exists in nature only as a disintegration product of uranium and thorium.
The longest lived isotope of actinium is Ac 227 with a half-life of 21.6 years. Its atomic number is 89, the melting point is 1,050°C, the estimated boiling point is 3,200°C, and its specific calculated gravity is 10.07, and a valence of 3.
Actinobacillosis is a sickness characterized by suppurative (causing pus) and granulomatous (inflammatory) lesions (abnormality of the skin or organs) in the respiratory tract, upper alimentary tract, skin, kidneys, joints, and other tissues.
"Actinobacillus lignieresii" infects cattle and sheep while "actinobacillosis Equuli" infects horses and pigs.Actinobacillosis affects the soft tissues, often the tongue and cervical lymph nodes, where granulomatous swellings form and eventually break down to form abscesses. Actinobacillosis is also called "wooden tongue", "woody tongue", or cruels.