hydroquinone/emorragia

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Effect of hydroquinone (HQ) on the development of chick embryos.

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The developmental toxic effect of hydroquinone (HQ) was evaluated in chick embryos after 72 and 96 hour of incubation. HQ was injected into the air sacs of the eggs at doses ranging from 0.0625 to 40 micrograms per egg. On the 15th day of incubation, live embryos including controls were removed from

Glutathione conjugates of tert-butyl-hydroquinone, a metabolite of the urinary tract tumor promoter 3-tert-butyl-hydroxyanisole, are toxic to kidney and bladder.

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3-tert-Butyl-4-hydroxyanisole and tert-butyl-hydroquinone (TBHQ) are antioxidants known to promote renal and bladder carcinogenesis in the rat, although the mechanisms of these effects are unclear. Because glutathione (GSH) conjugates of a variety of hydroquinones are nephrotoxic, and because

Heme induces heme oxygenase 1 via Nrf2: role in the homeostatic macrophage response to intraplaque hemorrhage.

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OBJECTIVE Intraplaque hemorrhage (IPH) is an important progression event in advanced atherosclerosis, in large part because of the delivery of prooxidant hemoglobin in erythrocytes. We have previously defined a novel macrophage phenotype (hemorrhage-associated-mac) in human advanced plaques with

VKORC1 deficiency in mice causes early postnatal lethality due to severe bleeding.

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Vitamin K hydroquinone is oxidised to the epoxide form (K>O) during vitamin K-dependent posttranslational gamma-glutamyl carboxylation resulting in biological active so called vitamin K-dependent proteins. In turn, K>O is reduced by the enzyme VKORC1 (vitamin K epoxide reductase complex component 1)

Experimental studies on the toxicity of lithographic developer solution.

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The purpose of this study was to determine whether the toxicity of a lithographic developer solution which contains hydroquinone is caused by hydroquinone or the alkaline lithographic developer solution. Male Wistar rats were divided into seven groups. In four groups, rats were dosed orally with 3%

VKCFD2 - from clinical phenotype to molecular mechanism.

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Vitamin K 2,3-epoxide reductase complex, subunit 1 (VKORC1) is an enzyme essential for the vitamin K cycle. VKORC1 catalyses the reduction of vitamin K 2,3-epoxide to the quinone form of vitamin K and further to vitamin K hydroquinone. The generated vitamin K hydroquinone serves as substrate for the

Characteristics of recombinant W501S mutated human gamma-glutamyl carboxylase.

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A mutation (W501S) in the vitamin K-dependent gamma-glutamyl carboxylase (VKC) that leads to a congenital bleeding disorder was recently discovered in two patients. To characterize the enzyme defect, recombinant VKC-W501S was expressed in and purified from insect cells. The major effect of the

Design and implementation of an imprinted material for the extraction of the endocrine disruptor bisphenol A from milk.

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This paper describes the determination of bisphenol A (BPA) in milk samples, using a novel molecularly imprinted polymer. The imprinted polymer was developed using a rational design approach, and pre-polymerization interactions were investigated using molecular dynamics simulations and X-ray

Cutaneous squamous cell carcinomas (SCC) associated with cosmetic skin whitening: 8 cases reported in Senegal.

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BACKGROUND The cosmetic use of bleaching products is common among women from sub-Saharan Africa. The most frequently used products are highly potent corticosteroids (clobetasol propionate) and hydroquinone. Herein, we report 8 cases of SCC in women using skin bleaching products for cosmetic

The Arg98Trp mutation in human VKORC1 causing VKCFD2 disrupts a di-arginine-based ER retention motif.

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Vitamin K 2,3-epoxide reductase complex subunit 1 (VKORC1) is an enzyme localized to the endoplasmic reticulum (ER) membrane. VKORC1 catalyzes the reduction of vitamin K 2,3-epoxide to vitamin K and to vitamin K hydroquinone, the latter required by the enzyme γ-carboxylase for γ-carboxylation of all

A gas chromatographic-mass spectrometric analysis for phenols in uremic serum.

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(1) The concentrations of unconjugated and conjugated phenol, p-cresol, benzyl alcohol, catechol, hydroquinone, homocatechol, and 2-methoxyresorcinol in uremic serum were determined using a mass fragmentographic method. Concentrations of all phenols in uremic serum were higher than in normal serum.

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