(n.) A white crystalline substance, C6H4(OH)2, obtained by the reduction of quinone. It is a diacid phenol, resembling, and metameric with, pyrocatechin and resorcin. Called also dihydroxy benzene.
Example Sentences:
(1) These series were prepared by oxidation of the new hydroquinone precursors.
(2) In the liver, the major site of benzene metabolism, benzene is converted by a cytochrome P-450-mediated pathway to phenol, the major metabolite, and the secondary metabolites, hydroquinone and catechol.
(3) Here we report that phenol hydroxylation to hydroquinone is also catalyzed by human myeloperoxidase in the presence of a superoxide anion radical generating system, hypoxanthine and xanthine oxidase.
(4) We tested nine (cadmium chloride, chloral hydrate, colchicine, diazepam, econazole nitrate, hydroquinone, pyrimethamine, thiabendazole, thimerosal) of the 10 known or suspected spindle poisons of the coordinated programme to study aneuploidy induction sponsored by the Commission of the European Communities using Saccharomyces cerevisiae D61.M (mitotic chromosomal malsegregation system).
(5) Comparison of these two activities for both the quinone and hydroquinone showed that the hydroquinone form had superior activities.
(6) 2-Chloro-1,4-dimethoxybenzene (IV) is oxidized by lignin peroxidase to generate 2,5-dimethoxy-1,4-benzoquinone (V), which is reduced to 2,5-dimethoxy-1,4-hydroquinone (VI).
(7) Bis(alkylthio)quinones 4a-d and 5a-d, and corresponding hydroquinones 9b-d exhibited high activities both in vitro and in vivo.
(8) Glutathione (GSH) conjugates of 2-bromohydroquinone are more difficult to oxidize than the parent hydroquinone.
(9) The activity of cytochrome P-450 reductase, which reduces quinones to hydroquinones in the estrogen redox cycle, was 6-fold higher in liver than in kidney of both control and estrogen-treated animals.
(10) The hydrolytic products of lignins, humic acids and industrial waste including hydroquinone, catechol, resorcinol, pyrogallol and 1,2,4-benzenetriol are widely distributed in water sources.
(11) Treatment with hydroquinone and 1,2,4,-benzenetriol produced DNA adducts not detected after treatment with either metabolite alone.
(12) The changes were also prevented by 0.02% hydroquinone.
(13) Compounds such as butylated hydroxytoluene, catechol, chlorobenzene, hydroquinone, potassium chloride, phenol, cis-stilbene, trans-stilbene, and toluene did not elicit positive responses in either strain.
(14) Catechol given alone was not inhibitory but when phenol was added to catechol, erythropoiesis was suppressed, as observed for the phenol and hydroquinone combination.
(15) Ethoxyquin, propyl gallate and butylated hydroquinone only partially inhibited rTNF-alpha-induced cytotoxicity, while the antioxidants butylated hydroxytoluene (BHT), alpha-tocopherol, ascorbic acid and thiodipropionic acid had minimal effects.
(16) Hydroquinone is estimated to be nonmutagenic by the Ames test but induces chromosome aberrations or karyotypic effects in eucaryotic cells.
(17) This observation prompted us to study in a well-defined in vitro system the possible allosteric interaction between the propeptide binding site and the vitamin K hydroquinone binding site on carboxylase.
(18) The present data indicate that hydroquinone and 1,2,4-benzenetriol in the presence of copper ions can lead to the formation of reactive hydroxyl radicals which can release TBAR from glutamate or DNA.
(19) In Tris-washed spinach chloroplasts (incapable of O2 evolution), the chlorophyll a fluorescence transient in the presence of various artificial electron donors (hydroquinone, diphenylcarbazide, MnCl2 and NH2OH) and in the absence of bicarbonate ions shows a rapid initial rise; the addition of 10 mM NaHCO3 restores the transient to one characteristic of normal chloroplast.
(20) The relative toxic potencies of the hydroquinone and quinone metabolites of AMAP were comparable to that of NAPQI, and do not readily explain the marked difference between the cytotoxic effects of AMAP and APAP.
Photographic
Definition:
(a.) Alt. of Photographical
Example Sentences:
(1) His son, Karim Makarius, opened the gallery to display some of the legacy bequeathed to him by his father in 2009, as well as the work of other Argentine photographers and artists – currently images by contemporary photographer Facundo de Zuviria are also on show.
(2) Photograph: Guardian The research also compiled data covered by a wider definition of tax haven, including onshore jurisdictions such as the US state of Delaware – accused by the Cayman islands of playing "faster and looser" even than offshore jurisdictions – and the Republic of Ireland, which has come under sustained pressure from other EU states to reform its own low-tax, light-tough, regulatory environment.
(3) Photograph: AP Reasons for wavering • State relies on coal-fired electricity • Poor prospects for wind power • Conservative Democrat • Represents conservative district in conservative state and was elected on narrow margins Campaign support from fossil fuel interests in 2008 • $93,743 G K Butterfield (North Carolina) GK Butterfield, North Carolina.
(4) Photograph: Gareth Phillips for the Guardian Because health is devolved, the Welsh government can do things differently from England.
(5) If you want to become a summit celebrity be sure to strike a pose whenever you see the ENB photographer approaching.
(6) Photograph: Christopher Thomond for the Guardian I don’t know how much my parents paid for their home but in 1955 the average house price for the whole country was £1,891.
(7) We performed a prospective study on 68 eyes of 68 patients to compare the vertical cup-disk ratio obtained with the video-ophthalmograph to that obtained with manual analysis of black-and-white stereoscopic photographs.
(8) The arrest of the Washington Post’s Tehran correspondent Jason Rezaian and his journalist wife, Yeganeh Salehi, as well as a photographer and her partner, is a brutal reminder of the distance between President Hassan Rouhani’s reforming promises and his willingness to act.
(9) Photograph: David Grayson David Grayson, director, The Doughty Centre for Corporate Responsibility, Cranfield University David became professor of corporate responsibility and director of the Doughty Centre for Corporate Responsibility at Cranfield School of Management, in April 2007, after a 30 year career as a social entrepreneur and campaigner for responsible business, diversity, and small business development.
(10) The record includes postoperative drawings of the intraoperative field by Dr. Cushing, a sketch by Dr. McKenzie illustrating the postoperative sensory examination, and pre- and postoperative photographs of the patient.
(11) Photograph: Dan Chung Around 220,000 live in this mud-brick labyrinth; some homes date back five centuries.
(12) Illustration by Andrzej Krause Photograph: Guardian The Foreign Office attributed the forgotten boxes to "an earlier misunderstanding about contents" and stated that there needed to be an "improvement in archive management".
(13) Aircraft pilots Facebook Twitter Pinterest ‘Getting paid to have your head in the clouds.’ Photograph: CTC Wings Includes: Flight engineers and flying instructors Average pay before tax: £90,146 Pay range: £66,178 (25th percentile) to £97,598 (60th percentile).
(14) Photograph: Christopher Thomond for the Guardian Asked if Watson should seek to refresh his mandate after Corbyn’s overwhelming victory among members, McCluskey added: “Well, if Tom wants to try to refresh his mandate it would be interesting to see what happens.” Watson said it was time “to be proud of our party”, because the Conservatives were beatable and the prime minister, Theresa May, could call an election any time.
(15) As part of a series of articles on various aspects of image conservation, practical advice is given on how best to ensure image permanence of contemporary photographs.
(16) Photograph: Jared Malsin for The Guardian They are among at least seven Egyptians – six Christians and one Muslim – who are believed to be held hostage in Libya, though that is regarded as a conservative estimate.
(17) The small number of discordant outcomes could generally be accounted for by three factors: (1) retinal abnormalities beyond those considered in the photographic grading system (12 eyes), (2) nonretinal visual pathway disease (five eyes), or (3) false-positive and false-negative results in the measurement systems used to evaluate structure and function (five eyes).
(18) Photograph: Facebook "Iran's state television is only showing one side of society, only the people with hijab.
(19) The positive predictive value of the clinical diagnosis could be increased to more than 80% by measuring the degree of miosis and ptosis on single photographs, or by assuming independent confirmation of the clinical diagnosis by a second observer.
(20) All was very accomplished; her award-winning photographs have been exhibited in the Smithsonian Institution in Washington, and her articles and pictures were published in books, periodicals, and newspapers around the world.