• WordNet 3.6
    • n actinism the property of radiation that enables it to produce photochemical effects
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Webster's Revised Unabridged Dictionary
    • n Actinism The property of radiant energy (found chiefly in solar or electric light) by which chemical changes are produced, as in photography.
    • ***
Century Dictionary and Cyclopedia
    • n actinism The radiation of heat or light, or that branch of natural philosophy which treats of the radiation of heat and light.
    • n actinism That property of light which, as may be seen in photography, produces chemical combinations and decompositions. A pencil of rays, when decomposed by refraction through a prism, is found to possess three properties, viz., the heating, the luminous, and the chemical or actinic. It was formerly supposed that the actinic property belonged peculiarly to the more refrangible part of the spectrum, beginning with the violet and extending far beyond the visible spectrum; it is now known, however, that the different rays differ essentially only in their wave-lengths, and that the phenomena of heat, light, or chemical action observed depend upon the surface on which the rays respectively fall. The violet end of the spectrum acts especially on the sensitive silver salts, but the chemical decomposition of the carbon dioxid (CO2) in the atmosphere involved in the growth of vegetation takes place most actively under the action of the yellow rays; and under proper conditions a photograph of even the ultra-red rays at the opposite end of the spectrum may be obtained on a gelatin plate sensitized with silver bromid.
    • n actinism In botany, the chemical action of sunlight on plants.
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Chambers's Twentieth Century Dictionary
    • n Actinism ak′tin-izm the chemical force of the sun's rays, as distinct from light and heat
    • ***


  • Brian Tracy
    “When you engage in systematic, purposeful actin, using and stretching your abilities to the maximum, you cannot help but feel positive and confident abut yourself.”
  • King Jr. Martin Luther
    “The more there are riots, the more repressive actin will take place, and the more we face the danger of a right-wing takeover and eventually a fascist society.”


Webster's Revised Unabridged Dictionary
Gr. , ray
Chambers's Twentieth Century Dictionary
Gr. aktis, aktinos, a ray.


In literature:

However, it possesses the advantages of high efficiency, of reasonably low brightness, of high actinic value, and of revealing detail clearly.
"Artificial Light" by M. Luckiesh
Why, 'tis like play-actin'; damme!
"Dead Man's Rock" by Sir Arthur Thomas Quiller-Couch
Actin' this way over a good-for-nothin' fellow like Jim Tenny!
"The Portion of Labor" by Mary E. Wilkins Freeman
Not but what New York wuz a-cuttin' up and a-actin' jest as bad, accordin' to its age.
"Samantha at the World's Fair" by Marietta Holley
Bill, that's the last play actin' show fer me!
"The Wit and Humor of America, Volume II. (of X.)" by Various
The street in all this neighborhood burst into a brilliant actinic glare.
"Brigands of the Moon" by Ray Cummings
They ain't actin' up thet er way fer nuthin', you kin bet.
"The Border Boys Across the Frontier" by Fremont B. Deering
Anyhow, it's wot you deserve, but none the less, I'm actin' as a reel friend, now ain't I?
"The Stowaway Girl" by Louis Tracy
I finds myself actin' just as eager as any, and me only doin' messenger work.
"Torchy" by Sewell Ford
Only it don't seem like actin' at all.
"Torchy, Private Sec." by Sewell Ford

In poetry:

I saw I'd made a clumsy break;
An' tied to cover it with talk
Of anything, for old Blair's sake.
He don't reply; but when I'd walk
Outside he says, "What's this I hear
About the mill boys actin' queer?"
"Old Bob Blair" by C J Dennis
I own I used me nut. Fer marriage brings
Experience to stop yeh actin' rash.
I've missed the step before through rushin' things,
An' come a crash.
I planned it out all careful frum the start;
Me taticks was a reel fine work uv art.
"The Also-Ran" by C J Dennis
Young Dick, the Dusty, wasn't half as cheeky as of old;
The men were actin' friendly-like, but I kept kind of cold
An' distant, as becomes a bloke who's scored a knock-out thump -
Till just approachin' dinner time; an' then I got my bump.
"The Vision" by C J Dennis
I puts it to yeh: Wuz we actin' fair?
Wot more could neighbors do to cheer a bloke?
We knoo they 'e 'ad troubles fer to bear,
An' jes called in to 'ave a friendly joke.
An', though we tempted 'im with 'am an' froot,
'E wouldn't play the flute.
"The Disagreeable Musician" by C J Dennis
If I'd been right, I might have known there's somehting in the air
By the way the blokes were actin'; but a fat lot did I care.
Swell visions an' the deadly pip was what was wrong with me.
I slung a word to my old dog, an' we trudged home to tea.
"The Vision" by C J Dennis

In news:

Interactions between Myosin and Actin Crosslinkers Control Cytokinesis Contractility Dynamics and Mechanics.
Basal Cell Skin Cancer Shown to Be Caused by Actinic Keratoses.
Coli bacteria and then placed the bacteria in dishes containing extracts of host cells, complete with actin.
Ibidi's LifeAct products are designed for undisturbed visualization of actin cytoskeleton organization and dynamics.
The company's LifeAct actin marker binds to the structure protein without constraining its activity.
That is, their initial cell lines arose lacking the alphasmooth muscle actin (aSMA) protein marker, the hallmark of a myofibroblast.
Actin OUT with ClathrIN p263.
Drosophila Anterior-Posterior Polarity Requires Actin-Dependent PAR-1 Recruitment to the Oocyte Posterior.
'Magic Mike' star in final negotiations for Cassavetes actin pic.
Loca People tweeted us pictures of them actin' a fool while listening to the TRAFFIC JAM .15 SECONDS OF FAME START NOW.

In science:

The stereocilia consist predominantly of bundles of actin filaments that are surrounded by a membrane which contains mechano-sensitive ion channels.
Mechanical oscillations at the cellular scale
Schematic representation of the hair bundle of an auditory hair cell. A bundle of stereocilia (SC) containing actin filaments form the hair bundle.
Mechanical oscillations at the cellular scale
However, if the microtubule network is depolymerized using nocodazole, the cell attains a state where the actin system forms a contractile ring which generates a constriction of the cell.
Mechanical oscillations at the cellular scale
However, it is likely that these oscillations are a result of a self-organization of the actin cytoskeleton with the help of myosin motors and maybe other components.
Mechanical oscillations at the cellular scale
An interesting example is the diffusive motion of magnetic beads in an actin network .
A Random Walk to a Non-Ergodic Equilibrium Concept