beta carotene/fogszuvasodás

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[Role of beta-carotene in the prevention of genotoxic damage in patients undergoing radiotherapy. Monitoring by the micronucleus test in exfoliative cells of the oral cavity].

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Radiotherapic treatment of patients with carcinoma usually causes genotoxis damage. This has been studied recently using the test of micronuclei in esfoliated cells. This test presents methodologic advantages in compared with the classic citogenetic analysis and as it is carried out on esfolieted

Remission of precancerous lesions in the oral cavity of tobacco chewers and maintenance of the protective effect of beta-carotene or vitamin A.

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Participants in the intervention trials were fishermen (Kerala, India), who chewed tobacco-containing betel quids daily before and throughout the study period. Frequency of oral leukoplakia, micronuclei in oral mucosal cells, and alterations in nuclear textures were used as endpoints. Administration

Beta-carotene plasma levels and content in oral mucosal epithelium is skin type associated.

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Beta-carotene is one of the important antioxidants in the defence mechanisms of the body against reactive oxygen species and, in particular, against UV radiation in the skin. The aim of our study was to measure if differences of beta-carotene in the peripheral blood and oral mucosa exist in relation

Strong coupling in a microcavity containing β-carotene.

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We have fabricated an open-cavity microcavity structure containing a thin film of the biologically-derived molecule β-carotene. We show that the β-carotene absorption can be described in terms of a series of Lorentzian functions that approximate the 0-0, 0-1, 0-2, 0-3 and 0-4 electronic and vibronic

Emerging role of beta-carotene and antioxidant nutrients in prevention of oral cancer.

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beta-carotene and other antioxidant nutrients, such as vitamin E, are well suited for widespread preventive use because they are nontoxic and easily given in supplement form. Intervention trials designed to show a reduction of cancer incidence in the general population are logistically and

In vitro effects of beta-carotene on human oral keratinocytes from precancerous lesions and squamous carcinoma.

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Human keratinocytes, obtained from bioptic specimens of healthy and preneoplastic oral mucosa, and from human cell lines from oral cavity tumors (KB and SCC-25) were treated with beta-carotene (10 microM). The colony forming efficiency (CFE), the proliferation rate and the frequency of

Sulfatides and arylsulfatase A activity in major salivary glands of hamster (Mesocricetus auratus) after adenocarcinoma induction in oral cavity.

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A biochemical study of sulfatides and arylsulfatase A (ASA) was carried out in the submandibular and sublingual glands of the male and female hamster Mesocricetus auratus after experimental induction of oral adenocarcinoma by 7,12-dimethylbenzanthracene (DMBA). Hamster experimental groups included

Use of exfoliated cells to study tissue-specific levels of beta-carotene in humans.

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This study was designed to explore the feasibility of using exfoliated cells to study beta-carotene incorporation into different epithelial tissues in humans. Exfoliated cells were collected from the oral cavities (by brushing the oral mucosa) and from the urogenital tracts (by centrifuging urine

Estimation of serum beta carotene levels in patients with oral submucous fibrosis in India.

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Oral submucous fibrosis (OSMF) is a chronic, insidious and disabling condition affecting the oral cavity, being especially prevalent in India and South East Asia. However, considering its high prevalence and potential to undergo malignant transformation, OSMF has not been widely investigated with

Cigarette smoking and cancer: intensity patterns in the alpha-tocopherol, beta-carotene cancer prevention study in Finnish men.

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Relative risks for lung and bladder cancers by smoking intensity level off at more than 15-20 cigarettes per day. A three-parameter excess relative risk model in pack-years and intensity quantified this leveling (Lubin et al., Am J Epidemiol 2007;166:479-89). Above 15-20 cigarettes per day was an

Co-encapsulation of Vitamin C and β-Carotene in liposomes: Storage stability, antioxidant activity, and in vitro gastrointestinal digestion

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Vitamin C (VC) and β-Carotene (βC) were selected to produce co-encapsulated liposomes using hydrophilic and hydrophobic cavities simultaneously by ethanol injection method. The results of liposomal structure characterized by particle size, polydispersity index, zeta-potential and transmission

Remission of oral precancerous lesions of tobacco/areca nut chewers following administration of beta-carotene or vitamin A, and maintenance of the protective effect.

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Designs of intervention trials are based on results from a multitude of disciplines. In this study, a comparative analysis of various chewing mixtures used by groups from different geographical locations (Guam, Peru, Taiwan, the Philippines, and India) and their link to oral cancer incidences was

Modified Radical Scavenging and Antioxidant Activity Measurement of β-Carotene with β-Cyclodextrins Complexation in Aqueous Medium.

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In order to evaluate the antioxidant capacity/activity of β-carotene (BC) in aqueous media, we investigated the inclusion complexes of BC with methyl-β-cyclodextrin (Me-β-CD), 2-hydroxypropyl-β-cyclodextrin (HP-β-CD) and 2-hydroxyethyl-β-cyclodextrin (HE-β-CD) that enhance water solubility and

Effects of alpha-tocopherol and beta-carotene supplementation on upper aerodigestive tract cancers in a large, randomized controlled trial.

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BACKGROUND Although smoking and alcohol consumption are the major risk factors for upper aerodigestive tract cancers, observational studies indicate a protective role for fruits, vegetables, and antioxidant nutrients. METHODS The authors examined whether daily supplementation with 50 mg dl

Metabolic polymorphisms as susceptibility markers for lung and oral cavity cancer.

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Lung and oral cavity cancers are causally associated with tobacco use. Alcohol is an independent risk factor for oral cavity cancer. Major classes of carcinogens present in tobacco and tobacco smoke are converted into DNA-reactive metabolites by cytochrome P450 (CYP)-related enzymes, several of

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