| 单词 | acid |
| 释义 | acid (æsɪd ) Word forms: acids 1. variable noun B2 An acid is a chemical substance, usually a liquid, which contains hydrogen and can react with other substances to form salts. Some acids burn or dissolve other substances that they come into contact with. ...citric acid. Acids in the stomach destroy the virus. 2. adjective B2 An acid substance contains acid. These shrubs must have an acid, lime-free soil. acidity (æsɪdɪti ) uncountable noun ...the acidity of rainwater. [+ of] Synonyms: sharpness, bitterness, harshness, pungency Synonyms: sourness, bitterness, sharpness, pungency 3. graded adjective An acid fruit or drink has a sour or sharp taste. A tomatillo is a small green Mexican fruit with a delicate and slightly acid taste. acidity uncountable noun Taste, and adjust the acidity of the fruit by adding a pinch of sugar if required. Synonyms: sharpness, bitterness, harshness, pungency Synonyms: sourness, bitterness, sharpness, pungency 4. graded adjective An acid remark, or acid humour, is very unkind or critical. This comedy of contemporary manners is told with compassion and acid humour. Synonyms: sharp, cutting, biting, severe acidly graded adverb [usually ADVERB with verb, also ADVERB adjective] 'You don't know how to be a mother and you never did,' she said acidly. Synonyms: sharply, cuttingly, bitterly, harshly 5. uncountable noun The drug LSD is sometimes referred to as acid. [informal] 6. See also amino acid, hydrochloric acid, nitric acid, nucleic acid, sulphuric acid Idioms: the acid test an experience or situation that proves how skilful or effective someone or something is My first really stressful day when things go wrong: that will be the real acid test. Easy Learning Idioms Dictionary. Copyright © HarperCollins Publishers Collocations: acid chain A short amino acid chain links the two subunits which gives rise to the tetrameric structure. Retrieved from Wikipedia CC BY-SA 3.0 Secondary structure focuses on minor conformations that develop as a result of the hydrogen bonding between the amino acid chain. Retrieved from Wikipedia CC BY-SA 3.0 This often causes a loss of function in the protein, as critical parts of the amino acid chain are no longer created. Retrieved from Wikipedia CC BY-SA 3.0 The protein consists of an amino acid chain of 47 residues, with the tertiary structure revealing a three stranded, anti-parallel beta sheet, one alpha helix, and the connecting loops. Retrieved from Wikipedia CC BY-SA 3.0 It’s an approach that involves breaking proteins down into shorter amino acid chains. Smithsonian Mag Acerola pulp had the highest ascorbic acid concentration. 2008, 'Determinação simultânea dos ácidos orgânicos tartárico, málico, ascórbico e cítrico em polpas de acerola, açaí e caju e avaliação da estabilidade em sucos de caju Simulataneous determination of tartaric, malic, ascorbic and citric acids in acerola, açai and cashew pulps, and stability evaluation in cashew juices', Química Nova The corrosion of zinc in phosphoric acid containing hexamine has been studied at different acid concentrations, inhibitor concentration and temperatures. 2010, 'Hexamine as Corrosion Inhibitors forZinc in Phosphoric Acid', E-Journal of Chemistry Humic acid concentration was determined by photometry on 254 nm. 2013, 'The investigation of humic acid adsorption from aqueous solutions onto modified pumice with hexadecyl trimethyl ammonium bromide', International Journal of Environmental Health Engineering The influence of methacrylic acid concentration on immobilization efficiency was studied. 2014, 'Preparation of Polyphosphazene Hydrogels for Enzyme Immobilization', Molecules Oat hulls elevated the caecal succinic acid concentration only in the unchallenged broilers. 2018, 'Effect of oat hulls as a free choice feeding on broiler performance, short chain fatty acids and microflora under a mild necrotic enteritis challenge', Animal Nutrition Scientists have found a way to increase glutamic acid content. The Sun (2011) All Baltic ambers are unique for the succinic acid content, no exceptions? AMBERBEACH (2001) The parental lines of the mapping populations contained wide variation in oil content and erucic acid content. 2018, 'QTL Landscape for Oil Content in Brassica juncea: Analysis in Multiple Bi-Parental Populations in High and “0” Erucic Background', Frontiers in Plant Science Must sugar content varied from 21,31 to 22,79%, and total acid content ranged from 7,66 to 8,09 gl-1. 2014, 'Agrobiological and technological characteristics of variety Pinot Gris clone B10 and Pinot Gris clone Rulander 2/54 in the Niš subregion', Acta Agriculturae Serbica A blood test can check your uric acid level. The Sun That's because some people have a high uric acid level but never get gout. The Sun The lactic acid level rises during fasting as glucose falls. Retrieved from Wikipedia CC BY-SA 3.0 But when acid levels rise too high it prevents them from extracting the minerals needed to build the hard structures. The Sun Potassium also protects against dry skin and blemishes because it helps maintain the body's acid levels. The Sun For every retinol additive and synthetic hyaluronic acid molecule, there's now a maitake mushroom, an alkalising super-green or an integral argan oil. Times, Sunday Times (2014) Each completely deprotonated 4-hydroxypyridine-2,6- dicarboxylic acid molecule assumes a tridentate chelating coordination mode. 2012, 'μ-4,4′-Bipyridine-bis[aqua(4-hydroxypyridine-2,6-dicarboxylato)copper(II)]', Acta Crystallographica Section E The gentisic acid molecule shows whole-molecule disorder over two sets of sites in a 0.809 (2):0.191 (2) ratio. 2016, 'Crystal structure of a 2:1 piroxicam–gentisic acid co-crystal featuring neutral and zwitterionic piroxicam molecules', Acta Crystallographica Section E: Crystallographic Communications A combination treatment of a mild glycolic acid peel and gentle microdermabrasion. Times, Sunday Times Though it sounds like an aggressive intervention, an acid peel can be a gentle way to remove the old skin that's making our wrinkles look deeper than we deserve. Times,Sunday Times At-home acid peels are another matter, however. Times,Sunday Times Consider an acid product if you suffer from acne or regular breakouts. Times,Sunday Times A mild dilution will not damage sealer, unlike bleach or acid products from the high street. Times, Sunday Times Sales of acid products may be restricted. Times, Sunday Times The plant produces 250 million pounds per year of phosphate and phosphoric acid products. Retrieved from Wikipedia CC BY-SA 3.0 These modifications were in turn used to improve alpha-linolenic acid production in this cyanobacterium. 2018, 'Engineering the fatty acid synthesis pathway in Synechococcus elongatus PCC 7942 improves omega-3 fatty acid production', Biotechnology for Biofuels Platelet activation leading to clot formation correlates with increased glycogenolysis, glucose uptake, glucose oxidation, and lactic acid production. 2017, 'Deletion of GLUT1 and GLUT3 Reveals Multiple Roles for Glucose Metabolism in Platelet and Megakaryocyte Function', Cell Reports However, no previous studies have focused on fumaric acid production by thermophilic fungi. 2018, 'Metabolic engineering of the thermophilic filamentous fungus Myceliophthora thermophila to produce fumaric acid', Biotechnology for Biofuels The ability to fix atmospheric nitrogen and indoleacetic acid production in vitro was determined. 2015, 'The effects of<i> </i>plant growth promoting<i> Bacillus pumilus</i> CCIBP-C5 on `Grande naine'<i> </i>(<i>Musa </i>AAA) plants in acclimatization stage', Biotecnología Vegetal Using 20 different media, copper was discovered to have a positive influence on itaconic acid production. 2012, 'Enhanced itaconic acid production in <it>Aspergillus niger</it> using genetic modification and medium optimization', BMC Biotechnology Chromium was deposed on a steel substrate from a chromic-sulphuric acid solution, during one hour. 2000, 'The properties of chromium electrodeposited with programmed currents. Part II. Reversing current', Journal of the Serbian Chemical Society Phosphonic acid groups are formed by the hydrolysis of the phosphonate ester groups in hydrobromic acid solution. 2016, 'Polybenzimidazole and Phosphonic Acid Groups-Functionalized Polyhedral Oligomeric Silsesquioxane Composite Electrolyte for High Temperature Proton Exchange Membrane', Journal of Nanomaterials Then, iron was hydrothermally removed from the acid solution as the precipitate of jarosite. 2016, 'Advances towards a Clean Hydrometallurgical Process for Chromite', Minerals Sweet potato starch mixed with various concentrations of malic acid solution underwent either thermal or nonthermal treatment. 2019, 'Structural and Physicochemical Characteristics of Granular Malic Acid-Treated Sweet Potato Starch Containing Heat-Stable Resistant Starch', Journal of Chemistry Recorded fluorescence signal in terephthalic acid solution containing gold nanoparticles was higher than the terephthalic acid solution without gold nanoparticles. 2012, 'Evaluation of Acoustic Cavitation in Terephthalic Acid Solutions Containing Gold Nanoparticles by the Spectrofluorometry Method', International Journal of Photoenergy On a laboratory scale, sulfuric acid can be diluted by pouring concentrated acid onto crushed ice made from de-ionized water. Retrieved from Wikipedia CC BY-SA 3.0 Typically, gelatin can be dispersed in a relatively concentrated acid. Retrieved from Wikipedia CC BY-SA 3.0 Dilute acid may be used under high heat and high pressure, or more concentrated acid can be used at lower temperatures and atmospheric pressure. Retrieved from Wikipedia CC BY-SA 3.0 Adding concentrated acid reverses the equation, and the copper ions go back into an aqueous solution. Retrieved from Wikipedia CC BY-SA 3.0 Unfortunately, acid digestion involves numerous manipulations of concentrated acids. Retrieved from Wikipedia CC BY-SA 3.0 Ditch any products that contain acid. The Sun The portable kits will enable police officers to safely search bottles that might contain acid, identify corrosive substances and to work out how toxic they are. Times, Sunday Times On my bench and above my own apparatus cupboard were bottles containing acids and alkali salts. Times, Sunday Times That includes both scrubbing at your face with grainy products and using skincare that contains acids. Times, Sunday Times Stay away from products containing acids while using the device. Times, Sunday Times Where once it was the lubrication of the supply chain, it became more like a corrosive acid. Times, Sunday Times They bought the format, but they drove it through a car wash; instead of water pouring over it, a corrosive acid was poured on every funny thing. Times, Sunday Times Their feet have mouths having the ability to spit a deadly, corrosive acid. Retrieved from Wikipedia CC BY-SA 3.0 They stand upon four legs, from which they can secrete a corrosive acid. Retrieved from Wikipedia CC BY-SA 3.0 For example, glassware or copper plates covered with graphene paint could be used as containers for corrosive acids. Times, Sunday Times Fruit acids are a more natural way to do the job - look out for pineapple and papaya in brightening masks. Times, Sunday Times To fight flaky skin, try a wash that contains fruit acids instead. The Sun This gentle exfoliating gel uses fruit acids and turns from a gel to an oil on the skin. The Sun Rich in antiseptic tea tree, which prevents newly waxed pores becoming irritated, with fruit acids to exfoliate skin gently. Times, Sunday Times Seeds are crushed to make exfoliating scrubs, and skins and juice are used for their fruit acids. Times, Sunday Times Malonic aciduria and ketonuria were found on urinary organic acid screen. 2015, 'Metabolic encephalopathy and lipid storage myopathy associated with a presumptive mitochondrial fatty acid oxidation defect in a dog', Frontiers in Veterinary Science However, the same was not observed for the organic acid extractant. 2012, 'Availability of heavy metals in contaminated soil evidenced by chemical extractants', Revista Ceres Most of the studies associated this activity to the produced organic acids, i.e., lactic acid, acetic acid, and hexanoic acid. 2018, 'Novel Antifungal Compounds, Spermine-Like and Short Cyclic Polylactates, Produced by Lactobacillus harbinensis K.V9.3.1Np in Yogurt', Frontiers in Microbiology Among the measured metabolites, five sugars (arabinose, mannose, glucopyranose, maltose, turanose) and one organic acid (propanoic acid) were significantly increased. 2015, 'Alleviation of cold damage to photosystem II and metabolisms by melatonin in Bermudagrass', Frontiers in Plant Science Acid reflux occurs when stomach acid leaks back into the oesophagus, or gullet. Times, Sunday Times (2010) Acid reflux is when stomach acid travels into the gullet and throat. Times, Sunday Times (2008) So the body has no time to prepare for the influx of food with the production of stomach acid and digestive enzymes. Times, Sunday Times (2015) Many M. E. people have digestive problems due to a lack of digestive enzymes and stomach acid. M. E. Post-Viral Fatigue Syndrome - How To Live With It (1989) An acclaimed opera singer says his career is back on track after having an implant fitted to stop stomach acid from burning his vocal cords. Times, Sunday Times (2014) Which weak acid is the second simplest carboxylic acid, after formic acid? Times, Sunday Times (2017) More sulfonic groups and weak acid groups were produced during the sulfite pretreatments. 2012, 'Comparative study of sulfite pretreatments for robust enzymatic saccharification of corn cob residue', Biotechnology for Biofuels The method utilizes a mediator, a weak acid that can form an insoluble salt with the titrant. 2010, 'Determination of Chlorinity of Water without the Use of Chromate Indicator', International Journal of Analytical Chemistry Translations: Chinese: 酸 Japanese: 酸 |
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