(a.) Sour, sharp, or biting to the taste; tart; having the taste of vinegar: as, acid fruits or liquors. Also fig.: Sour-tempered.
(a.) Of or pertaining to an acid; as, acid reaction.
(n.) A sour substance.
(n.) One of a class of compounds, generally but not always distinguished by their sour taste, solubility in water, and reddening of vegetable blue or violet colors. They are also characterized by the power of destroying the distinctive properties of alkalies or bases, combining with them to form salts, at the same time losing their own peculiar properties. They all contain hydrogen, united with a more negative element or radical, either alone, or more generally with oxygen, and take their names from this negative element or radical. Those which contain no oxygen are sometimes called hydracids in distinction from the others which are called oxygen acids or oxacids.
Example Sentences:
(1) The amino acid sequence deduced from the nucleotide sequence contained both amino- and carboxyl-terminal sequences.
(2) F(420) is photolabile aerobically in neutral and basic solutions, whereas the acid-stable chromophore is not photolabile under these conditions.
(3) The high amino acid levels in the cells suggest that these cells act as inter-organ transporters and reservoirs of amino acids, they have a different role in their handling and metabolism from those of mammals.
(4) If ascorbic acid was omitted from the culture medium, the extensive new connective tissue matrix was not produced.
(5) The interaction of the antibody with both the bacterial and the tissue derived polysialic acids suggests that the conformational epitope critical for the interaction is formed by both classes of compounds.
(6) Arachidic acid was without effect, while linoleic acid and linolenic acid were (on a concentration basis) at least 5-times less active than arachidonic acid.
(7) An unsaturated fatty acid auxotroph of Escherichia coli was grown with a series of cis-octadecenoate isomers in which the location of the double bond varied from positions 3 to 17.
(8) The ability of azelastine to influence antigen-induced contractile responses (Schultz-Dale phenomenon) in isolated tracheal segments of the guinea-pig was investigated and compared with selected antiallergic drugs and inhibitors of arachidonic acid metabolism.
(9) After 4 to 6 hours of recirculation, accumulation of vasoactive amine, 5-hydroxytryptamine, its major metabolite, 5-hydroxyindole acetic acid, and its precursor amino acid, tryptophan were detected.
(10) Spectrophotometric determination of the sulfhydryl content in the animal tissue before (control) and after using 6,6'-Dithiodinicotinic acid is applied.
(11) This death is also dependent on the presence of chloride and is prevented with the non-selective EAA antagonist, kynurenic acid, but is not prevented by QA.
(12) However, four of ten young adult outer arm (relatively sun-exposed) and one of ten young adult inner arm (relatively sun-protected) fibroblasts lines increased their saturation density in response to retinoic acid.
(13) Microionophoretically applied excitatory amino acids induced firing of extracellularly recorded single units in a tissue slice preparation of the mouse cochlear nucleus, and the similarly applied antagonist 2-amino-5-phosphonovalerate (2APV) was demonstrated to be a selective N-methyl-D-aspartate (NMDA) receptor antagonist.
(14) The LD50 of the following metal-binding chelating drugs, EDTA, diethylenetriaminepentaacetic acid (DTPA), hydroxyethylenediaminetriacetic acid (HEDTA), cyclohexanediaminotetraacetic acid (CDTA) and triethylenetetraminehexaacetic acid (TTHA) was evaluated in terms of mortality in rats after intraperitoneal administration and was found to be in the order: CDTA greater than EDTA greater than DTPA greater than TTHA greater than HEDTA.
(15) Estimations of the degree of incorporation of 14C from the radioactive labeled carbohydrate into the glycerol and fatty acid moieties were carried out.
(16) The second amino acid residue influences not only the rate of reaction but also the extent of formation of the product of the Amadori rearrangement, the ketoamine.
(17) Leumorphin is a 29-amino-acid peptide derived from preproenkephalin B. Intracerebroventricular (i.c.v.)
(18) Hepatic lymph flow increased only after ethacrynic acid and mannitol administration.
(19) The subcellular distribution of sialyltransferase and its product of action, sialic acid, was investigated in the undifferentiated cells of the rat intestinal crypts and compared with the pattern observed in the differentiated cells present in the surface epithelium.
(20) A phytochemical investigation of an ethanolic extract of the whole plant of Echites hirsuta (Apocynaceae) resulted in the isolation and identification of the flavonoids naringenin, aromadendrin (dihydrokaempferol), and kaempferol; the coumarin fraxetin; the triterpene ursolic acid; and the sterol glycoside sitosteryl glucoside.
Bitter
Definition:
(n.) AA turn of the cable which is round the bitts.
(v. t.) Having a peculiar, acrid, biting taste, like that of wormwood or an infusion of hops; as, a bitter medicine; bitter as aloes.
(v. t.) Causing pain or smart; piercing; painful; sharp; severe; as, a bitter cold day.
(v. t.) Causing, or fitted to cause, pain or distress to the mind; calamitous; poignant.
(v. t.) Characterized by sharpness, severity, or cruelty; harsh; stern; virulent; as, bitter reproach.
(1) Since the election on 7 March there has been a bitter contest for power in Iraq led by Iran, Saudi Arabia and Turkey.
(2) If bitter, pour it out and measure 1.4 litres of water.
(3) The dumplings could also be served pan-fried in browned butter and tossed with a bitter leaf salad and fresh sheep's cheese for a lighter, but equally delicious option.
(4) The first was a passive avoidance task in which the chicks were allowed to peck at a green training stimulus (a small light-emitting diode, LED) coated in the bitter liquid, methylanthranilate, giving rise to a strong disgust response and consequent avoidance of the green stimulus.
(5) In the QHCl-sucrose condition components separated by the tongue's midline and those spatially mixed produced equal amounts of bitterness suppression.
(6) At the interview those with conventional ileostomies expressed better preoperative comprehension of the procedure and more satisfaction about its life-saving nature; nevertheless, they experienced more negative emotional reactions, such as bitterness, after the operation.
(7) The higher analogues of the cycloalkane series containing alpha-aminocycloheptanecarboxylic acid methyl ester and alpha-aminocyclooctanecarboxylic acid methyl ester are bitter.
(8) It's almost starting to feel like we're back in the good old days of July 2005, when Paris lost out to London in the battle to stage the 2012 Olympic Games, a defeat immediately interpreted by France as a bitter blow to Gallic ideals of fair play and non-commercialism and yet another undeserved triumph for the underhand, free-market manoeuvrings of perfidious Albion.
(9) Hollande ended up defending until to the bitter end Jérôme Cahuzac , a finance minister responsible for fighting tax evasion who turned out to have used a secret Swiss bank account to avoid paying taxes in France.
(10) The sensitivity of the taste system to the various qualities was, in decreasing order, salty, sweet, sour, and bitter.
(11) Grace's ascent has also thrown a grenade into the bitter succession battle within Zanu-PF, which Mugabe has divided and ruled for decades.
(12) Denatonium, a very bitter substance, caused a rise in the intracellular calcium concentration due to release from internal stores in a small subpopulation of taste cells.
(13) I see myself in exactly the same situation as I saw myself yesterday, though obviously with the bitter disappointment of the failure of being knocked out.
(14) Stephen Joseph, its chief executive said: "This is bitter news for everyone who relies on the train to get to work, not least the large number of commuters in marginal constituencies who will be a key group at the next election."
(15) Lewis Wind Power, the joint venture company set up by Amec and British Energy, said it was "bitterly disappointed" by the decision.
(16) As night fell in Paris, despite the bitter cold, more than 5,000 people gathered under the imposing statue of Marianne, the symbol of the republic, to show their anger, grief and solidarity.
(17) The present alternative model of health care in China has evolved after prolonged and often bitter debate extending over twenty years.
(18) It is much less soluble and bitter and poses few stability problems when capsulated or tableted with aspirin.
(19) "They have given Mexicans the most bitter Christmas," Armando Martínez, the president of the College of Catholic Attorneys, told reporters.
(20) He says he is not bitter but his words are laced with hostility.