Academic literature on the topic 'Catechin'

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Journal articles on the topic "Catechin"

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Furushima, Daisuke, Takuma Nishimura, Norikata Takuma, Ryo Iketani, Tomohito Mizuno, Yuji Matsui, Tohru Yamaguchi, et al. "Prevention of Acute Upper Respiratory Infections by Consumption of Catechins in Healthcare Workers: A Randomized, Placebo-Controlled Trial." Nutrients 12, no. 1 (December 18, 2019): 4. http://dx.doi.org/10.3390/nu12010004.

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Catechins, phytochemicals contained mainly in green tea, exhibit antiviral activity against various acute infectious diseases experimentally. Clinical evidence supporting these effects, however, is not conclusive. We performed a placebo-controlled, single-blind, randomized control trial to evaluate the clinical effectiveness of consumption of catechins-containing beverage for preventing acute upper respiratory tract infections (URTIs). Two hundred and seventy healthcare workers were randomly allocated to high-catechin (three daily doses of 57 mg catechins and 100 mg xanthan gum), low-catechin (one daily dose of 57 mg catechins and 100 mg xanthan gum), or placebo (0 mg catechins and 100 mg xanthan gum) group. Subjects consumed a beverage with or without catechins for 12 weeks from December 2017 through February 2018. The primary endpoint was incidence of URTIs compared among groups using a time-to-event analysis. A total of 255 subjects were analyzed (placebo group n = 86, low-catechin group n = 85, high catechin group n = 84). The URTI incidence rate was 26.7% in the placebo group, 28.2% in the low-catechin group, and 13.1% in the high-catechin group (log rank test, p = 0.042). The hazard ratio (95% confidence interval (CI)) with reference to the placebo group was 1.09 (0.61–1.92) in the low-catechin group and 0.46 (0.23–0.95) in the high-catechin group. These findings suggest that catechins combined with xanthan gum protect against URTIs.
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Ozato, Naoki, Tohru Yamaguchi, Tatsuya Kusaura, Hidefumi Kitazawa, Masanobu Hibi, Noriko Osaki, and Takahiro Ono. "Effect of Catechins on Upper Respiratory Tract Infections in Winter: A Randomized, Placebo-Controlled, Double-Blinded Trial." Nutrients 14, no. 9 (April 29, 2022): 1856. http://dx.doi.org/10.3390/nu14091856.

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Tea catechins are plant-derived compounds that improve immune functions. Previous randomized control trials have demonstrated the efficacy of primarily epi-type catechins against upper respiratory tract infections (URTIs). Green tea can be consumed in several ways, including popular bottled beverages. These beverages, however, require sterilization during manufacturing, which results in catechin isomerization. We conducted a randomized, double-blinded, placebo-controlled trial involving healthy Japanese participants to evaluate whether catechin consumption via bottled beverages has an alleviating effect on the duration and severity of URTIs in winter. The catechin group (490 mg catechin, 0.14%, containing 59% epi-type catechin, n = 55) showed reduced durations of running nose, nasal congestion, and headache, compared with the placebo group (0 mg catechin, n = 54; p = 0.013, 0.018, and <0.001, respectively). Furthermore, when considering physical symptoms, the duration of nasopharyngeal symptoms improved significantly in the catechin group (p < 0.001) compared with that in the control group. The daily consumption of catechin thus reduced the duration and severity of URTIs in healthy men and women. Humans are regularly exposed to several potential infectious threats, and the oral administration of heat-epimerized tea catechins might help prevent and reduce the severity of URTIs.
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Nandika, Dodi, Khaswar Syamsu, Arinana, Dina Tiara Kusumawardhani, and Yuni Fitriana. "Bioactivities of catechin from gambir (Uncaria gambir Roxb.) against wood-decaying fungi." BioResources 14, no. 3 (June 3, 2019): 5646–56. http://dx.doi.org/10.15376/biores.14.3.5646-5656.

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Gambir is one of the most economically important natural products of Indonesia. Indonesia accounts for 80% of the global exports of this product. The product contains catechin, a phenolic compound of the flavonoid group, which has demonstrated bioactivity against horticulture-destroying fungi. However, its bioactivity in controlling wood-decaying fungi has not yet been reported. A laboratory study was conducted to examine the characteristics of the catechin of gambir and its bioactivity against the wood-decaying fungi Schizophylum commune Fr. Extraction of catechin from gambir was conducted via a gradual maceration process using hot water (70 °C, 3 h) followed by ethyl acetate (1:10 w/v, 4 h). The chemical components of catechin were analyzed by gas chromatography mass spectrometry (GCMS), while its bioactivity against S. commune was examined according to EN 113 (1986). The results showed that there were five chemical components in catechins, i.e., 1,2-benzenediol, catechol, 1,3,5-benzenetriol, dimethyl terephphtalate, and terephthalic acid. These compounds demonstrated the ability to remarkably inhibit the growth of S. commune.
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Osterc, G., M. Štefančič, A. Solar, and F. Štampar. "Potential involvement of flavonoids in the rooting response of chestnut hybrid (Castanea crenata × Castanea sativa) clones." Australian Journal of Experimental Agriculture 47, no. 1 (2007): 96. http://dx.doi.org/10.1071/ea05149.

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The involvement of different quercetins [quercetin-3-O-rhamnoside (quercitrin), quercetin-3-D-galactoside (hyperoside) and rutin] and catechins (catechin, catechol) in the rooting process of leafy cuttings was studied in two hybrid chestnut (Castanea crenata × Castanea sativa) clones, Maraval and Marsol. Both clones differed strongly in rooting results. The Maraval clone cuttings, which had a high rooting rate, contained, on average, higher amounts of all quercetins in different plant parts (leaves and basal cuttings) than the Marsol clone, which had a low rooting rate. There was a highly significant correlation between the quercetin contents of the cutting leaves and the rooting process (number of main roots). The catecechin contents of the cutting leaves did not show any correlation with the rooting process.
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Sasaki, Geoffrey Y., Yael Vodovotz, Zhongtang Yu, and Richard S. Bruno. "Catechin Bioavailability Following Consumption of a Green Tea Extract Confection Is Reduced in Obese Persons without Affecting Gut Microbial-Derived Valerolactones." Antioxidants 11, no. 12 (December 18, 2022): 2490. http://dx.doi.org/10.3390/antiox11122490.

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Obesity-related cardiometabolic disorders are driven by inflammation, oxidative stress, and gut dysbiosis. Green tea catechins protect against cardiometabolic disorders by anti-inflammatory, antioxidant, and prebiotic activities. However, whether obesity alters catechin bioavailability remains unknown. We hypothesized that obesity would decrease catechin bioavailability due to altered gut microbiota composition. Obese and healthy persons completed a pharmacokinetics trial in which a confection formulated with green tea extract (GTE; 58% epigallocatechin gallate, 17% epigallocatechin, 8% epicatechin, 6% epicatechin gallate) was ingested before collecting plasma and urine at timed intervals for up to 24 h. Stool samples were collected prior to confection ingestion. Catechins and γ-valerolactones were assessed by LC-MS. Obesity reduced plasma area under the curve (AUC0-12h) by 24–27% and maximum plasma concentrations by 18–36% for all catechins. Plasma AUC0-12h for 5′-(3′,4′-dihydroxyphenyl)-γ-valerolactone and 5′-(3′,4′,5′-trihydroxyphenyl)-γ-valerolactone, as well as total urinary elimination of all catechins and valerolactones, were unaffected. ⍺-Diversity in obese persons was lower, while Slackia was the only catechin-metabolizing bacteria that was altered by obesity. Ascorbic acid and diversity metrics were correlated with catechin/valerolactone bioavailability. These findings indicate that obesity reduces catechin bioavailability without affecting valerolactone generation, urinary catechin elimination, or substantially altered gut microbiota populations, suggesting a gut-level mechanism that limits catechin absorption.
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Ha, Lai Thi Ngoc, Tran Thi Hoai, Hoang Lan Phuong, and Nguyen Van Lam. "Exploitation of Catechin Extract from Pruned Tea Leaves as a Promising Food Preservative Against Lipid Oxidation." Vietnam Journal of Agricultural Sciences 7, no. 1 (March 29, 2024): 2040–51. http://dx.doi.org/10.31817/vjas.2024.7.1.03.

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In Vietnam, a tea-producing country, the tea buds and top three leaves are normally used for tea production while older leaves are pruned and discarded as agricultural waste in the winter. The present study aimed to exploit catechins from pruned tea leaves and use them as natural antioxidants for applications in the food industry. Catechins were analyzed using the guideline of ISO 14502-2-2005 by HPLC-MWD. The contents of catechins in pruned tea leaves of ten popular tea varieties were relatively high, ranging from 65.57 to 136.88 mg/g dry weight. The optimized conditions for catechin extraction from Phuc Van Tien pruned tea leaves (one of the varieties with a high catechin content) were found using response surface methodology as follows: a liquid-to-solid ratio of 21.6/1 at 70oC for 31 minutes. The catechin-rich extract powder was added to sesame oil to inhibit lipid oxidation. During oil accelerated oxidation at 60oC, the catechin-rich extract powder inhibited the increase of the peroxide value compared with the negative and positive controls (no preservative and added tert-butylhydroquinone, respectively). Significant positive correlations between the decrease of catechin content and the inhibition of peroxide formation (r = 0.91, 0.94, 0.95, 0.97, and 0.96 for catechin, epigallocatechin gallate, epigallocatechin, epicatechin gallate, and epicatechin, respectively, P <0.05) proved that the inhibition of peroxide formation in the sesame oil was essentially due to the antioxidant capacity of the catechins in the pruned tea leaf extract. Catechin extracts from pruned tea leaves are potential sources of natural antioxidants for oil preservation.
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Liu, Chao-Tzu, and Jason T. C. Tzen. "Exploring The Relative Astringency of Tea Catechins and Distinct Astringent Sensation of Catechins and Flavonol Glycosides via an In Vitro Assay Composed of Artificial Oil Bodies." Molecules 27, no. 17 (September 2, 2022): 5679. http://dx.doi.org/10.3390/molecules27175679.

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Artificial oil bodies covered by a recombinant surface protein, caleosin fused with histatin 3 (a major human salivary peptide), were employed to explore the relative astringency of eight tea catechins. The results showed that gallate-type catechins were more astringent than non-gallate-type catechins, with an astringency order of epicatechin gallate > epigallocatechin gallate > gallocatechin gallate > catechin gallate > epigallocatechin > epicatechin > gallocatechin > catechin. As expected, the extension of brewing time led to an increase in catechin content in the tea infusion, thus elevating tea astringency. Detailed analysis showed that the enhanced proportion of gallate-type catechins was significantly higher than that of non-gallate-type catechins, indicating that tea astringency was elevated exponentially, rather than proportionally, when brewing time was extended. Rough surfaces were observed on artificial oil bodies when they were complexed with epigallocatechin gallate (a catechin), while a smooth surface was observed on those complexed with rutin (a flavonol glycoside) under an atomic force microscope and a scanning electron microscope. The results indicate that catechins and flavonol glycosides induce the sensation of rough (puckering) and smooth (velvety) astringency in tea, respectively.
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Kukushkina, Татьяна Абдулхаиловна, Vera Andreevna Kostikova, and Elena Petrovna Khramova. "CONTENT OF CATECHINS IN LEAVES AND ROOTS OF COMARUM SALESOVIANUM AND COMARUM PALUSTRE (ROSACEAE)." chemistry of plant raw material, no. 2 (May 22, 2024): First. http://dx.doi.org/10.14258/jcprm.20240212561.

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The search for additional sources of catechins among the local flora is relevant today. The method for determining the content of catechins by the spectrophotometric method in the leaves of the subshrub Zalesov's cinquefoil (Comarum salesovianum (Steph.) Asch. et Graebn.) from the Rosaceae Juss. family was validated. The content of catechins in terms of (±)-catechin in the leaves and rhizomes of two species of the genus Comarum ‒ C. salesovianum and C. palustre L. (marsh cinquefoil) was studied. The highest content of catechins was found in the roots of C. palustre (4%) and leaves of C. salesovianum (2.58%). A method for determining the composition and content of individual catechins in the leaves and roots of two representatives of the genus Comarum by high-performance liquid chromatography has been proposed. Three catechins [(±)-catechin, epigallocatechin gallate and (-)-epicatechin] were found in leaves and roots. (±)-catechin and (-)-epicatechin are predominant in the leaves and roots of C. palustre and C. salesovianum. The content of epigallocatechin gallate does not exceed 0.1 mg/g. The concentration of (±)-catechin is highest in the roots (1.21 mg/g) of C. palustre, and (-)-epicatechin is highest in the leaves (1.35 mg/g) of C. salesovianum.
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Mita, Soraya Ratnawulan, Marline Abdassah, Unang Supratman, Yoshihito Shiono, Driyanti Rahayu, Iyan Sopyan, and Gofarana Wilar. "Nanoparticulate System for the Transdermal Delivery of Catechin as an Antihypercholesterol: In Vitro and In Vivo Evaluations." Pharmaceuticals 15, no. 9 (September 13, 2022): 1142. http://dx.doi.org/10.3390/ph15091142.

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Gambir (Uncaria Gambir, Roxb.) contains catechins that is often empirically used to treat various diseases. Catechins can reduce cholesterol levels by inhibiting coenzyme HMG-CoA reductase that plays a role in cholesterol metabolism. Research has been carried out covering the optimization of transethosomal catechins, the formulation of Transethosomal Catechin Gel (TCG) and Non-Transethosomal Catechin Gel (NTCG), which were then tested for catechin permeation from these gel preparations in vitro using Franz’s diffusion cell with PTFE membranes. The anti-hypercholesterol activity test was carried out with Simvastatin orally as a positive control using 25 male Wistar rats (Rattus norvegicus). The catechin transetosomes have a size of 176.1 ± 5.8 nm, Zeta potential −11.6 ± 5.28, and Entrapment Efficacy of 96.77% ± 0.05. The result of cumulative catechins that permeated from TCG and NTCG were and 172.454 ± 5.287 and 112.741 ± 2.241 μg respectively. Permeation test graphs showed similar permeation and flux profiles. TCG can reduce total cholesterol and LDL (Low Density Lipoprotein) values in rats by 39.77% and 51.52% respectively during 14 days of use.
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Furushima, Daisuke, Yu Otake, Natsumi Koike, Shintaro Onishi, Takuya Mori, Noriyasu Ota, and Hiroshi Yamada. "Investigation of the Oral Retention of Tea Catechins in Humans: An Exploratory Interventional Study." Nutrients 13, no. 9 (August 29, 2021): 3024. http://dx.doi.org/10.3390/nu13093024.

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Green tea catechin ingestion or gargling exhibit anti-viral activity against upper respiratory infection. We hypothesized that retention in the oral cavity could improve the anti-viral effects of catechins. The present study investigated the oral retention of catechins in humans and the effect of catechin beverage viscosity on oral retention. Two intervention studies with different test beverages, beverage-C (40 mL, containing 73.4 mg of catechins) and beverage-XT (40 mL, beverage-C containing 100 mg xanthan gum) were conducted in 20 healthy volunteers (mean age 38.7 years). Catechin concentrations were measured in buccal mucosa samples collected at 10 min, 40 min, and 60 min after ingesting test beverages, and the catechin variability of the tissue after intake was compared between test beverages. As a result, the mean (SEM) concentrations of EGCG were 99.9 (27.2), 58.2 (16.6), and 22.3 (5.7) ng/mg-mucosa at 10, 40, and 60 min, respectively, after ingestion of beverage-XT. Similarly, the catechin concentrations were 86.1 (20.3), 32.2 (5.3), and 27.8 (5.9) ng/mg-mucosa after ingestion of beverage-C. The total retention volume over 60 min tended to be slightly higher after ingestion of beverage-XT, though the difference was not statistically significant. Additional studies are needed to confirm the effect of xanthan gum on improving oral retention of catechins.
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Dissertations / Theses on the topic "Catechin"

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Charoenchon, Nisamanee. "Can green tea catechin supplement protect against photoageing?" Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/can-green-tea-catechin-supplement-protect-against-photoageing(64eefb5f-ef37-4900-9c03-3477c8a74e50).html.

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Photoaged skin caused by chronic ultraviolet radiation (UVR) is characterised clinically with hyperpigmentation, coarse skin texture and deep wrinkles; the worst outcome is skin cancer. Histological investigation of the alteration within major extracellular matrices (ECM; elastic fibres, fibrillar collagens) is essential study to understand the cellular effect on skin structure from UVR. This thesis used an acute dose of radiation to examine in humans in vivo the effect of UVR on ECM components before assessing whether a dietary intervention could protect skin from UVR damage. Green tea catechins (GTCs) have anti-oxidant properties and may be an interesting option as a systemic photoprotection agent. Hence this thesis assesses: 1) the effect of acute irradiation of skin on dermal ECM damage to see whether it mimics the changes observed in photoageing and; 2) whether dietary supplementation with GTC will provide dermal ECM protection. UV-induced change in elastic fibre network. Initially, the effect of two different UV light sources on elastic fibre protein (elastic fibres, fibrillin-rich microfibrils and fibulin-2 and -5 microfibrils) remodelling was performed. The effect of ultraviolet B vs full-spectrum solar simulated radiation (SSR) were investigated in a small sample of healthy Caucasian volunteers (n = 6 per group). At 24 hour after 3× MED irradiation, Weigert's resorcin–fuchsin stained elastic fibres showed a significant reduction regardless of irradiation protocol (UVB, P<0.01; SSR P<0.05). Specific components were identified by immunohistochemistry; a significant reduction in fibrillin-rich microfibrils (FRM) was observed in UVB-irradiated skin (P<0.05), whilst fibulin-5-positive microfibrils were only affected by SSR (P<0.05). The data revealed, therefore, differential effects on UV wavelength on ECM remodelling. SSR, the more physiologically relevant light source was used in subsequent studies Supplement effect in SSR-induced damage in elastic fibre. Fifty healthy volunteers were recruited to this randomised control trial to investigate whether GTC can protect skin from photodamage. Volunteers were randomized to GTC (1080 mg plus 100 mg vitamin C; n=25) or placebo (maltodextrin; n = 25) daily for 12-weeks with compliance assessed biochemically in urine samples. Of the n = 50 recruited, 44 volunteers completed the study. In baseline, UVR challenge resulted in a significant remodeling of the cutaneous elastic fiber system (P<0.001), particularly fibulin-2 and fibulin-5-positive microfibrils at 24-hr after 3×MED irradiation. In post-supplementation, fibulin-5 positive microfibrils were protected from UVR remodeling (% staining, mean ± SE; no UV, 18.1±0.89; UVR, 17.1±0.61; P=0.30) whilst no protection was seen in the placebo group (no UVR, 19.41±0.79; UVR, 17.69±0.61; P<0.05). Supplement effect in SSR-induced damage in collagenous matrix. In the identical experiment, collagenous matrices including synthesis of procollagen I was also examined as fibrillar collagens are the major ECM components providing strength within dermis. The fibrillar collagen and newly synthesised procollagen I were stained by Picrosirius red and immunohistochemistry respectively. At baseline, acute irradiation significantly reduced papillary dermal fibrillar collagens (P<0.001) and induced deposition of newly synthesised pro-collagen I (P=0.02). In post-supplementation, GTC enhanced the deposition of thin collagen fibres in the dermis. Whilst placebo showed no effect on the altered organisation of fibrillar collagens or deposition of pro-collagen I following the irradiation challenge, GTC protected the organisation of fibrillar collagens in the papillary dermis (P=0.97).This novel in vivo human study may be used to recapitulate elastic fibre and collagen changes associated with photoageing and may be useful for dissecting out the mechanisms underlying extracellular matrix damage in response to chronic sunlight exposure. Furthermore, in a randomized control trial, dietary GTC protected fibulin-5 microfibrils and collagen fibres in the papillary dermis from UV-mediated degradation. The mechanism by which this protection occurs requires further study.
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Ahn, Jinsoo. "Characterization of (+)-Catechin and Quercetin from Pawpaw Pulp." Ohio University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1307045912.

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Peng, Zhongkui. "Feeding determinants in aphids with special reference to the Rose Aphid Macrosiphum rosae (L.)." Title page, table of contents and introduction only, 1991. http://web4.library.adelaide.edu.au/theses/09PH/09php398.pdf.

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Bibliography: leaves 170-189. This thesis looks at aphid feeding determinants by type and location. It examines the role of leaf surface chemicals in the discrimination of host plants and the deterrent effect of catechin and its oxidative condensation products.
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Forrest, Neil David. "Studies on new approaches for the radiolabelling of (+)-catechin." Thesis, University of Glasgow, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410656.

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Ryle, Peter Robert. "Ethanol-induced fatty liver : protective action of (+)-catechin compounds." Thesis, University of Surrey, 1986. http://epubs.surrey.ac.uk/847975/.

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The aim of the work presented in this thesis was to assess the protective properties of the bioflavanoid drug, (+)-catechin, and its palmityl ester, 3-palmitoyl-(+)-catechin, against ethanol hepato-toxicity (ie: fatty liver) in the rat. In initial experiments, both (+)-catechin compounds were found to protect against the hepatic lipid accumulation (mainly triglyceride) after acute ethanol dosing, and after long-term feeding of ethanol in a liquid diet. In the latter situation, 3-palmitoyl-(+)-catechin was significantly more effective than (+)-catechin itself at preventing fatty liver, probably as a result of its greater lipid solubility and longer half-life in the liver tissue. Published work suggested two possible mechanisms of action for the (+)-catechin compounds against ethanol hepatotoxicity. Firstly, the ability of the drugs to correct the elevated hepatic NADH:NAD ratio (redox-state) after ethanol dosing may limit steatosis. Secondly, free radical scavenging properties may prevent liver injury occurring as a result of ethanol-induced lipid peroxidation. Acute experiments were performed which confirmed that the (+)-catechin compounds corrected the redox-state change after acute ethanol administration, but subsequent studies in which correction of the redox-state by Naloxone or Methylene Blue was found to have little influence on ethanol-induced steatosis, suggested that this was not the mechanism of action of the drugs. Synthetic antioxidants (free radical scavengers) were found to prevent both acute and chronic ethanol-induced fatty liver, under the same experimental conditions as those under which the (+)-catechin compounds afforded protection, without reversing the redox-state change after ethanol dosing. 3-Palmitoyl-(+)-catechin was then shown to prevent ethanol-induced hepatic lipid peroxidation (measured as mitochondrial diene conjugates and liver malonaldehyde levels) after acute ethanol dosing, at the same time as preventing triglyceride accumulation. As other effects of the compounds which might influence fat accumulation after ethanol were excluded (eg: inhibition of ethanol metabolism or lowering of liver acetaldehyde concentrations), it was concluded that the (+)-catechin compounds protect against alcoholic fatty liver in rats by inhibiting ethanol-induced lipid peroxidation, and the possible consequence of the latter (ie: mitochondrial damage and impaired fatty acid oxidation), rather than acting through modulation of the redox-state. The findings here cast doubts on the commonly-quoted 'redox-state' mechanism for fatty liver production by ethanol, and support the lipid peroxidation hypothesis for alcoholic liver injury.
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Lee, Suk-ching. "Effect of green tea derived compounds on the growth of androgen independent prostate cancer in vivo /." View the Table of Contents & Abstract, 2006. http://sunzi.lib.hku.hk/hkuto/record/B36404640.

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Kopaniszen, Malgorzata. "Protective effect of green tea polyphenols on dinitrobenzene sulphonic acid (DNBS)-induced colitis in mice." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B40687466.

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Chen, Jie Jack. "Growth inhibition effects of green tea and epigallocatechin gallate in bladder tumors." Click to view the E-thesis via HKUTO, 2003. http://sunzi.lib.hku.hk/hkuto/record/B4257772X.

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Yu, Sze-tak. "Effects of Chinese green tea and tea catechins on lipolysis." Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21106137.

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Hsiao, Hui-Chun. "ANTHOCYANIN COLOR ENHANCEMENT BY USING CATECHIN AS COPIGMENTS AND STABILITY DURING STORAGE." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1397748937.

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Books on the topic "Catechin"

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Polat, Susan. Der Einfluss von (+)-Catechin [Catechin] und (+)-Catechinderivaten [Catechinderivaten] auf die Permeabilität von künstlichen Lecithinmembranen. [s.l.]: [s.n.], 1989.

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MSc, Banerjee B. Dr, and Chaudhuri T. C, eds. Therapeutic effects of tea. Enfield, NH, USA: Science Publishers, 2005.

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Navarro, Cristian Geisse. Catechi. Santiago: Montacerdos Ediciones, 2018.

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Kreuziger, Frederick A. Church & catechism: The Baltimore catechism revisited. Denver, Colo: Reflex Books, 1986.

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Paul, Daughters of St, ed. Basic catechism. 7th ed. Boston, Mass: Pauline Books & Media, 1999.

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Wu, Wenbiao. Green Tea: Varieties, Production and Health Benefits. Nova Science Publishers, Incorporated, 2013.

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(Editor), Yukiaki Kuroda, and Yukihiko Hara (Editor), eds. Health Effects of Tea and its Catechins. Springer, 2004.

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Tea In Health And Disease Prevention. Academic Press, 2012.

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Banerjee, B. Therapeutic Effects of Tea. Taylor & Francis Group, 2005.

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Banerjee, B. Therapeutic Effects of Tea. Taylor & Francis Group, 2005.

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Book chapters on the topic "Catechin"

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Li, H., C. Fisher, R. W. Keown, and C. P. Malone. "Interactions of Green Tea Catechin with Polyamides." In ACS Symposium Series, 90–100. Washington, DC: American Chemical Society, 1994. http://dx.doi.org/10.1021/bk-1994-0547.ch010.

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Mattice, Wayne L. "Fluorescence of Oligomers that Contain Catechin or Epicatechin." In Plant Polyphenols, 447–58. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3476-1_25.

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Tomita, I., M. Sano, K. Sasaki, and T. Miyase. "Tea Catechin (EGCG) and Its Metabolites as Bioantioxidants." In ACS Symposium Series, 209–16. Washington, DC: American Chemical Society, 1998. http://dx.doi.org/10.1021/bk-1998-0701.ch021.

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Ohmori, Ken, and Keisuke Suzuki. "Synthetic Strategies and Tactics for Catechin and Related Polyphenols." In Recent Advances in Polyphenol Research, 371–410. Chichester, UK: John Wiley & Sons, Ltd, 2014. http://dx.doi.org/10.1002/9781118329634.ch12.

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Valencia-Hernández, Leidy Johana, Juan Alberto Ascacio-Valdés, Jorge Enrique Wong-Paz, Haroon Khan, and Cristóbal N. Aguilar. "Immune Booster Property of Epigallocatechin-3-Gallate and Catechin." In Nutraceuticals and Functional Foods in Immunomodulators, 291–312. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2507-8_12.

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Mondal, Deba Brata, Jithin Mullakkalparambil Velayudhan, Aishwarya Lekshman, Ravi Shankar Kumar Mandal, Raguvaran Raja, and Naveen Kumar. "Nanofabrication of Catechin-Loaded Alginate, Pectin, and Chitosan Polymeric Nanoparticles." In Springer Protocols Handbooks, 399–422. New York, NY: Springer US, 2022. http://dx.doi.org/10.1007/978-1-0716-2425-8_31.

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Ranjbar Mohammadi, Marziyeh, Mohammad Nouri-Taba, and Ehsan Yousefi. "Biological and Antibacterial Properties of Catechin-Incorporated PLA/Gelatin Hybrid Microfibers." In Eco-friendly and Smart Polymer Systems, 497–501. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45085-4_121.

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Carando, Stéphane, and Pierre-Louis Teissedre. "Catechin and Procyanidin Levels in French Wines: Contribution to Dietary Intake." In Plant Polyphenols 2, 725–37. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4139-4_40.

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Mattice, Wayne L. "Determination of the Unperturbed Dimensions of Polymers of (+)-Catechin and (-)-Epicatechin." In Polymers in Aqueous Media, 285–93. Washington, DC: American Chemical Society, 1989. http://dx.doi.org/10.1021/ba-1989-0223.ch014.

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Stöß, H., P. Freisinger, B. Pontz, and U. Vetter. "Zum Einfluß von Catechin auf die Kollagenfibrillen des Osteoids bei Osteogenesis imperfecta." In Osteologie aktuell VIII, 281–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-78676-1_55.

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Conference papers on the topic "Catechin"

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Mello-Júnior, Ronaldo Elias, João Renato De Jesus Junqueira, Jefferson Luiz Gomes Corrêa, Kamilla Soares de Mendonça, and Lucas Barreto de Carvalho. "Osmotic dehydration of eggplant, carrot and beetroot slices: Effect of vacuum on phenolic acid composition." In 21st International Drying Symposium. Valencia: Universitat Politècnica València, 2018. http://dx.doi.org/10.4995/ids2018.2018.7787.

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The aim of this work was to evaluate the influence of vacuum application on the phenolic acid content of osmodehydrated eggplant, carrot and beetroot samples. The contents of catechins and chlorogenic acid were determined by HPLC analysis. Changes in the contents of phenolic acids after the osmotic processes were observed. It was found a reduction in catechins and chlorogenic acids, probable due to the migration and degradation losses. In a general way, the vacuum reduced the catechin and chlorogenic acid contents, compared to the osmotic dehydration at atmospheric pressure. Keywords: Pulsed vacuum osmotic dehydration; chlorogenic acid; catechins.
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Yaneva, Zvezdelina, and Donika Ivanova. "CATECHIN HYDRATE DESORPTION FROM NEWLY-SYNTHESIZED CATECHIN-LOADED BIOPOLYMER PARTICLES." In RAD Conference. RAD Centre, 2020. http://dx.doi.org/10.21175/radproc.2020.21.

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Joniová, Jaroslava, and Georges Wagnières. "Photoprotective effect of catechin during ALA-PDT." In 17th International Photodynamic Association World Congress, edited by Tayyaba Hasan. SPIE, 2019. http://dx.doi.org/10.1117/12.2527278.

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Lapi, D., M. Varanini, R. Scuri, and A. Colantuoni. "Effects of Catechin on cerebral arteriole vasomotion in spontaneously hypertensive rats." In 2020 11th Conference of the European Study Group on Cardiovascular Oscillations (ESGCO). IEEE, 2020. http://dx.doi.org/10.1109/esgco49734.2020.9158049.

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Brindha, T., R. Rathinam, S. Dheenadhayalan, and M. Malarvizhi. "Extraction of polyphenols from green tea – HPLC purification of catechin fractions." In THE 8TH ANNUAL INTERNATIONAL SEMINAR ON TRENDS IN SCIENCE AND SCIENCE EDUCATION (AISTSSE) 2021. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0108679.

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Разницына, В. М., Р. В. Шафигулин, В. А. Куркин, and А. В. Буланова. "INVESTIGATION OF CHROMATOGRAPHIC BEHAVIOR OF FLAVONOIDS BY RP HPLC." In Инновации и «зелёные» технологии : IV Всероссийская научно-практическая конференция. Crossref, 2024. http://dx.doi.org/10.34830/sounb-conf.2023.71.17.026.

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Изучена сорбция некоторых флавоноидов (рутина, (+)-катехин гидрата, гесперидина, цинарозида, кверцитрина) на сверхсшитом полистироле из водно-ацетонитрильных растворов методом ОФ ВЭЖХ. Оценено влияние добавок бромидных имидазолиевых ионных жидкостей на эффективность и селективность разделения. The sorption of some flavonoids (rutin, (+)-catechin hydrate, hesperidin, cynaroside, quercitrin) on hyper-cross-linked polystyrene from aqueous-acetonitrile solutions by RP HPLC was studied. The effect of additives of bromide imidazolium ionic liquids on the efficiency and selectivity of separation was estimated.
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Chen, Hua-cai, Yong-jun Zhang, and Jia-xing Jiang. "Determination of Catechin Monomers in Tea Polyphenols Powder Using NIR and ANN." In 2010 Symposium on Photonics and Optoelectronics (SOPO 2010). IEEE, 2010. http://dx.doi.org/10.1109/sopo.2010.5504085.

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DE SOLE, P., ML VUOTTO, R. MIRANDA, C. NAPPO, MTL IELPO, V. MOSCATIELLO, E. LAGHI, G. ASSO, L. RICCIARDI, and A. BASILE. "CRITICAL LEG ISCHAEMIA: IN VITRO MODULATION OF PERIPHERAL LEUCOCYTE ACTIVITY BY (+)-CATECHIN." In Proceedings of the 11th International Symposium. WORLD SCIENTIFIC, 2001. http://dx.doi.org/10.1142/9789812811158_0096.

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Mrkalić, Emina, Marina Ćendić Serafinović, Stefan Stojanović, Miroslav Sovrlić, and Ratomir Jelić. "Binding of tigecycline to human serum albumin in the presence of (+)-catechin." In 7th International Electronic Conference on Medicinal Chemistry. Basel, Switzerland: MDPI, 2021. http://dx.doi.org/10.3390/ecmc2021-11366.

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Sari, Ellyta, Elly Desni Rahman, Burmawi, and Natassya Athiya Salsabila. "Evaluation of pre-purification extractors of catechin isolation from community Gambier (Uncaria Gambiere Roxb)." In INTERNATIONAL CONFERENCE ON MECHANICAL MATERIALS AND RENEWABLE ENERGY (ICMMRE 2022). AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0116373.

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Reports on the topic "Catechin"

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Kanner, Joseph, Edwin Frankel, Stella Harel, and Bruce German. Grapes, Wines and By-products as Potential Sources of Antioxidants. United States Department of Agriculture, January 1995. http://dx.doi.org/10.32747/1995.7568767.bard.

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Several grape varieties and red wines were found to contain large concentration of phenolic compounds which work as antioxidant in-vitro and in-vivo. Wastes from wine production contain antioxidants in large amounts, between 2-6% on dry material basis. Red wines but also white wines were found to prevent lipid peroxidation of turkey muscle tissues stored at 5oC. The antioxidant reaction of flavonoids found in red wines against lipid peroxidation were found to depend on the structure of the molecule. Red wine flavonoids containing an orthodihydroxy structure around the B ring were found highly active against LDL and membrane lipid peroxidation. The antioxidant activity of red wine polyphenols were also found to be dependent on the catalyzer used. In the presence of H2O2-activated myoglobin, the inhibition efficiency was malvidin 3-glucoside>catechin>malvidin>resveratol. However, in the presence of an iron redox cycle catalyzer, the order of effectiveness was resveratol>malvidin 3-glucoside = malvidin>catechin. Differences in protein binding were found to affect antioxidant activity in inhibiting LDL oxidation. A model protein such as BSA, was investigated on the antioxidant activity of phenolic compounds, grape extracts, and red wines in a lecithin-liposome model system. Ferulic acid followed by malvidin and rutin were the most efficient in inhibiting both lipid and protein oxidation. Catechin, a flavonal found in red-wines in relatively high concentration was found to inhibit myoglobin catalyzed linoleate membrane lipid peroxidation at a relatively very low concentration. This effect was studied by the determination of the by-products generated from linoleate during oxidation. The study showed that hydroperoxides are catalytically broken down, not to an alcohol but most probably to a non-radical adduct. The ability of wine-phenolics to reduce iron and from complexes with metals were also demonstrated. Low concentration of wine phenolics were found to inhibit lipoxygenase type II activity. An attempt to understand the bioavailability in humans of antocyanins from red wine showed that two antocyanins from red wine were found unchanged in human urine. Other antocyanins seems to undergo molecular modification. In hypercholesterolemic hamsters, aortic lipid deposition was significantly less in animals fed diets supplemented with either catechin or vitamin E. The rate of LDL accumulation in the carotid arteries was also significantly lower in the catechin and vitamin E animal groups. These results suggested a novel mechanism by which wine phenolics are associated with decreased risk of coronary heart diseases. This study proves in part our hypothesis that the "French Paradox" could be explained by the action of the antioxidant effects of phenolic compounds found at high concentration in red wines. The results of this study argue that it is in the interest of public health to increase the consumption of dietary plant falvonoids. Our results and these from others, show that the consumption of red wine or plant derived polyphenolics can change the antioxidant tone of animal and human plasma and its isolated components towards oxidative reactions. However, we need more research to better understand bioavailability and the mechanism of how polyphenolics affect health and disease.
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Kelley, James. Catechol effected dissolution of silicate minerals. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.970.

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Rogan, Eleanor G. Initiation of Breast Cancer: Activated Catechol Estrogens. Fort Belvoir, VA: Defense Technical Information Center, June 1998. http://dx.doi.org/10.21236/ada351950.

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Poocharoen, Boonthong. Reaction of aqueous catechol solutions with minerals. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.1118.

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Haak, Ronald. An investigation of arsenic(V)-catechol complexes. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.2843.

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Sasan, Koroush, Patrick Brady, James L. Krumhansl, and Tina M. Nenoff. Removing Dissolved Silica from Waste Water with Catechol and Active Carbon. Office of Scientific and Technical Information (OSTI), January 2017. http://dx.doi.org/10.2172/1340632.

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Jeon, Chaeyoung, and Ildoo Chung. Fabrication and properties of 3D printable dental composite containing catechol polymer. Peeref, July 2023. http://dx.doi.org/10.54985/peeref.2307p9651711.

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Naim, Michael, Andrew Spielman, Shlomo Nir, and Ann Noble. Bitter Taste Transduction: Cellular Pathways, Inhibition and Implications for Human Acceptance of Agricultural Food Products. United States Department of Agriculture, February 2000. http://dx.doi.org/10.32747/2000.7695839.bard.

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Historically, the aversive response of humans and other mammals to bitter-taste substances has been useful for survival, since many toxic constituents taste bitter. Today, the range of foods available is more diverse. Many bitter foods are not only safe for consumption but contain bitter constituents that provide nutritional benefits. Despite this, these foods are often eliminated from our current diets because of their unacceptable bitterness. Extensive technology has been developed to remove or mask bitterness in foods, but a lack of understanding of the mechanisms of bitterness perception at the taste receptor level has prevented the development of inhibitors or efficient methods for reducing bitterness. In our original application we proposed to: (a) investigate the time course and effect of selected bitter tastants relevant to agricultural products on the formation of intracellular signal molecules (cAMP, IP3, Ca2+) in intact taste cells, in model cells and in membranes derived therefrom; (b) study the effect of specific bitter taste inhibitors on messenger formation and identify G-proteins that may be involved in tastant-induced bitter sensation; (c) investigate interactions and self-aggregation of bitter tastants within membranes; (d) study human sensory responses over time to these bitter-taste stimuli and inhibitors in order to validate the biochemical data. Quench-flow module (QFM) and fast pipetting system (FPS) allowed us to monitor fast release of the aforementioned signal molecules (cGMP, as a putative initial signal was substituted for Ca2+ ions) - using taste membranes and intact taste cells in a time range below 500 ms (real time of taste sensation) - in response to bitter-taste stimulation. Limonin (citrus) and catechin (wine) were found to reduce cellular cAMP and increase IP3 contents. Naringin (citrus) stimulated an IP3 increase whereas the cheese-derived bitter peptide cyclo(leu-Trp) reduced IP3 but significantly increased cAMP levels. Thus, specific transduction pathways were identified, the results support the notion of multiple transduction pathways for bitter taste and cross-talk between a few of those transduction pathways. Furthermore, amphipathic tastants permeate rapidly (within seconds) into liposomes and taste cells suggesting their availability for direct activation of signal transduction components by means of receptor-independent mechanisms within the time course of taste sensation. The activation of pigment movement and transduction pathways in frog melanophores by these tastants supports such mechanisms. Some bitter tastants, due to their amphipathic properties, permeated (or interacted with) into a bitter tastant inhibitor (specific phospholipid mixture) which apparently forms micelles. Thus, a mechanism via which this bitter taste inhibitor acts is proposed. Human sensory evaluation experiments humans performed according to their 6-n-propyl thiouracil (PROP) status (non-tasters, tasters, super-tasters), indicated differential perception of bitterness threshold and intensity of these bitter compounds by different individuals independent of PROP status. This suggests that natural products containing bitter compounds (e.g., naringin and limonin in citrus), are perceived very differently, and are in line with multiple transduction pathways suggested in the biochemical experiments. This project provides the first comprehensive effort to explore the molecular basis of bitter taste at the taste-cell level induced by economically important and agriculturally relevant food products. The findings, proposing a mechanism for bitter-taste inhibition by a bitter taste inhibitor (made up of food components) pave the way for the development of new, and perhaps more potent bitter-taste inhibitors which may eventually become economically relevant.
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Lubahn, Dennis B. Breast Cancer Associated Estrogen Receptors: Catechol Estrogen Receptors in ER-Minus Mice. Fort Belvoir, VA: Defense Technical Information Center, October 2000. http://dx.doi.org/10.21236/ada396453.

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Lubahn, Dennis B. Breast Cancer Associated Estrogen Receptors: Catechol Estrogen Receptors in ER-Minus Mice. Fort Belvoir, VA: Defense Technical Information Center, October 1999. http://dx.doi.org/10.21236/ada391322.

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