(a.) Destitute, or partially destitute, of light; not receiving, reflecting, or radiating light; wholly or partially black, or of some deep shade of color; not light-colored; as, a dark room; a dark day; dark cloth; dark paint; a dark complexion.
(a.) Not clear to the understanding; not easily seen through; obscure; mysterious; hidden.
(a.) Destitute of knowledge and culture; in moral or intellectual darkness; unrefined; ignorant.
(a.) Evincing black or foul traits of character; vile; wicked; atrocious; as, a dark villain; a dark deed.
(n.) Absence of light; darkness; obscurity; a place where there is little or no light.
(n.) The condition of ignorance; gloom; secrecy.
(n.) A dark shade or dark passage in a painting, engraving, or the like; as, the light and darks are well contrasted.
(v. t.) To darken to obscure.
Example Sentences:
(1) And that, as much as the “on water, operational” considerations, is why we are being kept in the dark.
(2) The first group was reared in complete darkness while the second one was subjected to permanent noise.
(3) In the dark the 6-azidoflavoproteins are quite stable, except for L-lactate oxidase, where spontaneous conversion to the 6-amino-FMN enzyme occurs slowly at pH 7.
(4) Most notably, retroperitoneal lymph nodes in rabbits remained dark blue up to 28 days after hindlimb endolymphatic instillation of liposomal patent blue.
(5) In the dark cortical zone of the nodes (III group) there occur tissue basophils (mast cells), that, together with increasing number of acidophilic granulocytes and appearance of neutrophilic cells, demonstrates that there is an inflammatory reaction in the organ studied as a response to the lymphocytic suspension injected.
(6) Urinalysis revealed a low pH, increased ketones and bilirubin excretion, dark yellowish change in color, the appearance of "leaflet-shaped" crystals and increased red blood cells and epithelial cells in the urinary sediment, increased water intake, decreased specific gravity and decreased sodium, potassium and chloride in the urine.
(7) We were searching for spontaneous and positional nystagmus in 5 positions with open eyes in darkness and with closed eyes.
(8) Previous FTIR measurements have identified several tyrosine residues that change their absorption characteristics between light-adapted BR and dark-adapted BR, or between intermediates K and M [Dollinger, G., Eisenstein, L., Lin, S.-L., Nakanishi, K., Odashima, K., & Termini, J.
(9) Steady state levels of chloroplast mRNA encoding the core PSII polypeptides remain nearly constant in the light or the dark and are not affected by the developmental stage of the plastid.
(10) The second triplet, which was stable in the dark at 4.2 K following illumination, was assigned to the radical pair Donor+I-.
(11) The results indicate that CRALBP X 11-cis-retinol is sufficiently stereoselective in its binding properties to warrant consideration as a component of the mechanism for the generation of 11-cis-retinaldehyde in the dark.
(12) Although the Ca2+-independent mechanism accounts for about two thirds of the total acetylcholine release in the dark, the amount of acetylcholine released in this way is small compared with the release of acetylcholine triggered by stimulation of the retina with light.
(13) The extracellular concentration of GABA is probably high in prolonged darkness, and it is low after prolonged light exposure.
(14) In lettuce, the presence of 2,4-D in the light lowered the concentration of total Hg (or MeHg) required to reduce growth by 50%, about 13 times relative to that in the dark (i.e., it sensitized the cells).
(15) This suggests that many retinal ganglion cells continue to discharge in total darkness for long periods.
(16) In darkness, raising the concentration of K in the fluid of perfusion gives an increase of the efflux of (86)Rb and increasing the extracellular concentration of Ca yields a retention.
(17) Upon illumination, a dark-adapted photosynthetic sample shows time-dependent changes in chlorophyll (Chl) a fluorescence yield, known as the Kautsky phenomenon or the OIDPS transient.
(18) One elderly woman was left alone in the dark for hours unable to find food or drink.
(19) These observations indicated a novel mechanism that in the absence of light-dark schedule, mothers taught the circadian rhythm to the pups as they raised them.
(20) It was observed that the circadian rhythm was disrupted by injections of lithium at the beginning of the light as well as the dark phase of the LD cycle.
Darken
Definition:
(a.) To make dark or black; to deprive of light; to obscure; as, a darkened room.
(a.) To render dim; to deprive of vision.
(a.) To cloud, obscure, or perplex; to render less clear or intelligible.
(a.) To cast a gloom upon.
(a.) To make foul; to sully; to tarnish.
(v. i.) To grow or darker.
Example Sentences:
(1) Immediate pigment darkening (IPD) occurs in human skin upon exposure to ultraviolet-A and visible radiation.
(2) There would never be a meeting in a darkened room where a winner was chosen just to fit an audience demographic or to create more entertaining telly.
(3) Each subject sat for 6 minutes in a darkened room and was told to memorize a list of words she heard form a tape.
(4) Normal, refractile spores were produced in each case; a portion of the barium spores lost refractility and darkened.
(5) Instead of coming to the bank, where we would be photographed coming in the front door, we were all to meet outside the McDonald's in Liverpool Street where we would be picked up in a people-carrier with darkened windows and driven in through the back of the bank.
(6) The final stage of germination was characterized by changes in the central spore region (core), notably phase darkening of the spore center and stainability with mercurochrome, and by a slight additional absorbancy decrease.
(7) Confluent patches of flat pigmentation appeared over the palpebral conjunctiva 18 weeks after the onset of treatment and showed progressive lateral enlargement and darkening.
(8) The 16 sites were qualitatively examined for evidence of resorption by either thinning or darkening of bone relative to the time immediately following surgery.
(9) Today's matches take place in a darkened hall within the stadium's towering walls, on the battlefields of multimillion-selling first-person shoot-'em-up Call of Duty .
(10) alpha-Melanocyte stimulating hormone (alpha-MSH) is a linear tridecapeptide (Ac-Ser-Tyr-Ser-Met-Glu-His-Phe-Arg-Trp-Gly-Lys-Pro-Val-NH2) that has diverse physiological functions in addition to its reversible darkening of amphibian skins by stimulating melanosome dispersion within melanophores.
(11) 1) Asphyxia induced marked body colour darkening and bradycardia.
(12) The most striking feature of such neurons was darkening of their dendrites associated with abnormally high density cytoplasm that contained mitochondria with disrupted cristae.
(13) Braving darkening skies, they were initially in an upbeat mood, belting out the samba rhythm of carnival classic I'm Going to Celebrate.
(14) With official unemployment data today expected to show a further rise in the long-term unemployed, the TUC argues young people were some of the worst affected by Britain's deep recession and their outlook could darken further as public sector job losses intensify.
(15) beta-Adrenoceptor blocking agents, in contrast, inhibit catecholamine-induced darkening but have no effect on MSH-induced darkening.
(16) During the hibernation period, the epiphyseal catecholamine charge is well detected in the garden dormouse; it appears more important in darkened animals at 22 degrees C and much less in animals under continuous lighting.
(17) Melanocyte stimulating hormone-induced darkening or dispersion of the granules was reversed by each of these metabolites.
(18) Reactivation of the enzyme extracted from darkened leaves was achieved simply by adding a thiol compound.
(19) By analyzing the synaptic relationships of such "darkened" dendrites, connections in the upper dorsal horn can be deciphered.
(20) The specific activity of the light enzyme was consistently about twice that of the dark form when assayed at suboptimal (but physiological) pH (pH 7.0-7.3), and the former was also less sensitive to feedback inhibition by L-malate than that from darkened leaves under various conditions.