326
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Pratt LA, Xu F, McQuillan GM, Robitz R. The association of depression, risky sexual behaviours and herpes simplex virus type 2 in adults in NHANES, 2005-2008. Sex Transm Infect 2011; 88:40-4. [PMID: 22057015 DOI: 10.1136/sextrans-2011-050138] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
OBJECTIVES Depression has been linked to risky sexual behaviours in adolescents, but there is little research among adults. The goal of this analysis was to examine the associations between current depression and self-reported risky sexual behaviours in a nationally representative sample of US adults aged 20-59 years. The authors also examined the association between depression and infection with herpes simplex virus type 2 (HSV-2), a biological marker of risky sexual behaviours. METHODS The authors used data from the 2005-2008 National Health and Nutrition Examination Surveys. Current depression was measured by the Patient Health Questionnaire-9. Antibodies to HSV-2 were tested using the enzymatic immunodot assay. The authors used logistic regression to examine the associations controlling for socio-demographic variables. RESULTS Among 5273 adults aged 20-59 years, 7% had depression, 36% reported 10 or more lifetime sex partners, 15% had two or more past-year sex partners and 13% had first sex before 15 years of age. Persons with each of the risky sexual behaviours were more likely to have depression than those without. In stratified analyses, risky sexual behaviours were associated with depression in women but not in men. Among 3940 adults aged 20-49 years, 19% had HSV-2 infection. Persons with HSV-2 infection were more likely to have depression (OR 2.1, 95% CI 1.5 to 2.9). CONCLUSIONS Risky sexual behaviour is related to current depression in adult women. Healthcare providers should be aware of this association and its potential implications in order to deliver better care for patients with depression or sexually transmitted infections.
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327
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Huang PW, Huang JH, Yen CH, Cheng CY, Xu F, Ku HC, Lee SF. Coexistence of exchange bias and magnetization pinning in the MnO(x)/GaMnAs system. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2011; 23:415801. [PMID: 21952033 DOI: 10.1088/0953-8984/23/41/415801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Coexistence of exchange bias (H(E)) and magnetization (M) shift was observed in as-grown and field-annealed MnO(x)/Ga(0.95)Mn(0.05)As bilayers. It was found that H(E) initially decreases with the annealing time t(a) and then increases when t(a) > 30 min, while the M shift remains almost unchanged with t(a). X-ray photoelectron spectroscopy (XPS) analysis reveals that MnO(x) is composed of MnO and Mn(3)O(4), and the volume amount ratio of Mn(3)O(4) to MnO increases with increasing t(a). A simple model based on a uniform MnO-Mn(3)O(4) interface with constant 'pinned' uncompensated interfacial spins is proposed to account for the observed exchange-biased phenomena in the bilayers.
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328
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Bennett L, Zhao Z, Barber B, Zhou X, Peeters M, Zhang J, Xu F, Wiezorek J, Douillard JY. Health-related quality of life in patients with metastatic colorectal cancer treated with panitumumab in first- or second-line treatment. Br J Cancer 2011; 105:1495-502. [PMID: 21989186 PMCID: PMC3242525 DOI: 10.1038/bjc.2011.409] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Background: Panitumumab in combination with chemotherapy was evaluated in two pivotal clinical trials in first- and second-line treatment of metastatic colorectal cancer (mCRC), respectively. This analysis compared the health-related quality of life (HRQoL) of patients with or without panitumumab in the two trials. Methods: Patients with mCRC were randomised to FOLFOX (first-line trial) or FOLFIRI (second-line trial)±panitumumab. The EuroQoL 5-Dimensions Health State Index (EQ-5D HSI) and Visual Analogue Scale (EQ-5D VAS) were assessed at baseline and monthly follow-up until disease progression. Patients with wild-type KRAS mCRC with baseline and post-baseline HRQoL scores were included. Difference in change from baseline between treatment groups was evaluated using linear mixed and pattern-mixture models. Results: In the first-line trial, 576 patients with wild-type KRAS mCRC (284 panitumumab+FOLFOX4 and 292 FOLFOX4 alone) were included in the HRQoL analyses. In the second-line trial, 530 patients with wild-type KRAS mCRC were included in these analyses (263 panitumumab+FOLFIRI and 267 FOLFIRI alone). There was no significant difference in the change in EQ-5D HSI and VAS scores between treatment groups in either trial. Conclusion: The addition of panitumumab to FOLFOX4 or FOLFIRI in first- or second-line treatment of wild-type KRAS mCRC significantly improved progression-free survival without compromising HRQoL.
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329
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An YF, Xu F, Wang M, Zhang ZY, Zhao XD. Clinical and molecular characteristics of immunodysregulation, polyendocrinopathy, enteropathy, X-linked syndrome in China. Scand J Immunol 2011; 74:304-309. [PMID: 21595732 DOI: 10.1111/j.1365-3083.2011.02574.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Immunodysregulation, polyendocrinopathy, enteropathy, X-linked (IPEX) syndrome is a rare X-linked recessive disorder causing life-threatening systemic autoimmunity because of immunodysregulation. The FOXP3 gene had been reported as the responsible gene, which was critical for the functions of CD4(+) CD25(+) FOXP3(+) regulatory T cells (Tregs) and maintenance of peripheral immunologic tolerance. So far, no IPEX patients with definite mutations in the FOXP3 gene had been reported in China. In this study, the genotypes and phenotypes were investigated in three IPEX infants from three unrelated Chinese families. Patient 1 (P1) presented with a classical clinical phenotype, whose mutation was a novel frameshift insertion in exon 11, led to the complete abrogation of Tregs. Patient 2 (P2) showed incomplete IPEX phenotype. He carried a missense mutation in exon 11 with slightly increased frequency of Tregs, whereas Patient 3 (P3) presented with a relatively mild classical phenotype and had a previously reported missense mutation in exon 10 with decreased frequency of Tregs. We firstly report three Chinese IPEX patients with definite mutations of FOXP3 gene. Our study indicated the potential correlation between the genotype and the phenotype of IPEX, which was different from the previous reports.
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330
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Burkes R, Siena S, Cassidy J, Tabernero J, Barugel M, Humblet Y, Cunningham D, Xu F, Krishnan K, Douillard J. 6095 POSTER Randomized, Open-label, Phase 3 Study of Panitumumab (Pmab) With FOLFOX4 Vs FOLFOX4 Alone as 1st-line Treatment for Metastatic Colorectal Cancer (mCRC) – the Role of Hypomagnesemia (Hypomag) on Efficacy. Eur J Cancer 2011. [DOI: 10.1016/s0959-8049(11)71740-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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331
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Cherezov V, Wu B, Chien E, Liu W, Xu F, Stevens RC. Structural biology of G protein-coupled receptors. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311096760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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332
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Meites E, Xu F, Hutchins K, Ackerson B, Gee J, Eriksen E, Naleway A, Markowitz L, Zangwill K. P3-S2.02 Variations in testing and treatment received by infants with possible neonatal herpes. Br J Vener Dis 2011. [DOI: 10.1136/sextrans-2011-050108.446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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333
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Johnson R, Ware D, Mena L, Xu F. P3-S1.11 Per cent additional test positive following positive Combo 2 Chlamydia (CT) and gonorrhoea (GC) specimens: assessing the impact of prevalence. Br J Vener Dis 2011. [DOI: 10.1136/sextrans-2011-050108.411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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334
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Xu F, Stoner B, Taylor S, Mena L, Tian L, Papp J, Hutchins K, Martin D, Markowitz L. O3-S3.06 Rescreening for chlamydial infection using home-based, self-obtained vaginal swabs: a randomised controlled trial in family planning clinic clients. Br J Vener Dis 2011. [DOI: 10.1136/sextrans-2011-050109.120] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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335
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Xu F, Yan S, Wu M, Li F, Xu X, Song W, Zhao J, Xu J, Kan H. Ambient ozone pollution as a risk factor for skin disorders. Br J Dermatol 2011; 165:224-5. [DOI: 10.1111/j.1365-2133.2011.10349.x] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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336
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De Castro N, Xu F, Porcher R, Pavie J, Molina JM, Peraldi MN. Pneumocystis jirovecii pneumonia in renal transplant recipients occurring after discontinuation of prophylaxis: a case–control study. Clin Microbiol Infect 2011; 16:1375-7. [PMID: 20041898 DOI: 10.1111/j.1469-0691.2009.03143.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A case-control study was conducted to identify risk factors for Pneumocystis jirovecii pneumonia (PCP) in renal transplant recipients. Eleven cases of PCP were matched with 22 controls. Cases occurred a median of 18 months after transplantation, and none of the recipients was receiving prophylaxis. Univariate analysis showed that graft rejection, duration of steroid use, use of mammalian target of rapamycin (mTOR) inhibitors and lymphocytopenia at the time of prophylaxis discontinuation were risk factors for PCP. In the multivariate model, only graft rejection (OR 8.66, p 0.017) remained significantly associated with PCP. In patients with a history of graft rejection, PCP prophylaxis should be maintained, especially among those with lymphocytopenia.
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337
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Su JH, Xu F, Lu XL, Lu TJ. Fluid flow induced calcium response in osteoblasts: mathematical modeling. J Biomech 2011; 44:2040-6. [PMID: 21665208 DOI: 10.1016/j.jbiomech.2011.05.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2010] [Revised: 05/03/2011] [Accepted: 05/03/2011] [Indexed: 11/28/2022]
Abstract
Fluid flow in the bone lacuno-canalicular network can induce dynamic fluctuation of intracellular calcium concentration ([Ca(2+)](i)) in osteoblasts, which plays an important role in bone remodeling. There has been limited progress in the mathematical modeling of this process probably due to its complexity, which is controlled by various factors such as Ca(2+) channels and extracellular messengers. In this study we developed a mathematical model to describe [Ca(2+)](i) response induced by fluid shear stress (SS) by integrating the major factors involved and analyzed the effects of different experimental setups (e.g. [Ca(2+)](i) baseline, pretreatment with ATP). In this model we considered the ATP release process and the activities of multiple ion channels and purinergic receptors. The model was further verified quantitatively by comparing the simulation results with experimental data reported in literature. The results showed that: (i) extracellular ATP concentration has more significant effect on [Ca(2+)](i) baseline (73% increase in [Ca(2+)](i) with extracellular ATP concentration varying between 0 and 10 μM), as compared to that induced by SS (25% variation in [Ca(2+)](i) with SS varying from 0 to 3.5 Pa); (ii) Pretreatment with ATP-medium results in different [Ca(2+)](i) response as compared to the control group (ATP-free medium) under SS; (iii) Relative [Ca(2+)](i) fluctuation over baseline is more reliable to show the [Ca(2+)](i) response process than the absolute [Ca(2+)](i) response peak. The developed model may improve the experimental design and facilitate our understanding of the mechanotransduction process in osteoblasts.
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338
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Wang Y, Wang K, Zhang Z, Chen L, Xu F. Primary renal synovial sarcoma--a case report. W INDIAN MED J 2011; 60:354-356. [PMID: 22224354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Renal synovial sarcoma is a recently reported neoplasm rarely seen. We report a case of primary renal synovial sarcoma. The signs and symptoms are similar to any primary renal tumour diagnosis is clinically difficult through general survey or multiple imaging modalities and requires specific molecular and genetic testing. Surgical resection and ifosfamide-based chemotherapy are the mainstay of management. The prognosis can be poor. Physicians should be aware that synovial sarcoma is one of the possibilities of malignancy in the kidney.
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339
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Douillard J, Siena S, Cassidy J, Tabernero J, Burkes RL, Barugel ME, Humblet Y, Cunningham D, Xu F, Krishnan K. Final results from PRIME: Randomized phase III study of panitumumab (pmab) with FOLFOX4 for first line metastatic colorectal cancer (mCRC). J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.3510] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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340
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Siena S, Cassidy J, Tabernero J, Burkes RL, Barugel ME, Humblet Y, Cunningham D, Xu F, Krishnan K, Douillard J. Randomized phase III study of panitumumab (pmab) with FOLFOX4 compared with FOLFOX4 alone as first line treatment (tx) for metastatic colorectal cancer (mCRC): Results by Eastern Cooperative Oncology Group (ECOG) performance status (PS). J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.3567] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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341
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Bi F, Li Q, Zhou C, Yu J, Cai X, Qiu M, Liu J, Yi C, Luo D, Xu F. Preliminary results of a randomized phase II study: Treatment of Chinese patients with advanced gastric cancer with FOLFIRI followed by FOLFOX7 or the reverse sequence. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.4064] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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342
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Xia ZJ, Wang ZH, Li S, Chen XQ, Wang FH, Xu F, Zhou NN, Xia Y, Li YJ, Wang KF. First-line gemcitabine, oxaliplatin, and l-asparaginase chemotherapy followed by involved field radiation in stage IE/IIE extranodal NK/T-cell lymphoma. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.e18540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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343
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Bennett L, Zhao Z, Barber B, Zhou X, Peeters M, Zhang J, Xu F, Wiezorek JS, Douillard J. Health-related quality of life in patients with metastatic colorectal cancer treated with panitumumab in first- or second-line treatment. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.e19500] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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344
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Zhou T, Duan JJ, Zhou GP, Cai JY, Huang ZH, Zeng YT, Xu F. Impact of depression mood disorder on the adverse drug reaction incidence rate of anticancer drugs in cancer patients. J Int Med Res 2011; 38:2153-9. [PMID: 21227021 DOI: 10.1177/147323001003800631] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The aim of this study was to explore the impact of depression mood disorder on the incidence of adverse drug reactions of anticancer drugs in cancer patients. The Hamilton Depression Scale 17 was used to evaluate the depression mood disorder level in 73 cancer patients before chemotherapy. Pharmacists monitored adverse drug reactions during the chemotherapy period. The relationship between depression mood disorder level and the incidence of adverse drug reactions was analysed. The frequency and extent of total adverse drug reactions were not related to depression mood disorder level. The frequency and extent of subjectively experienced adverse drug reactions such as anorexia, nausea and fatigue were related to depression mood disorder level. In conclusion, psychological support and intervention should be provided to cancer patients in order to improve patient adherence and cancer chemotherapy effectiveness, and to decrease the incidence of adverse drug reactions.
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345
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Xu F, Mukherjee T, Chen H, Huang M. Interplay between chiral and deconfinement phase transitions. EPJ WEB OF CONFERENCES 2011. [DOI: 10.1051/epjconf/20111302004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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346
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Han CC, Wang JW, Pan ZX, Tang H, Xiang SX, Wang J, Li L, Xu F, Wei SH. Effect of liver X receptor activation on the very low density lipoprotein secretion and messenger ribonucleic acid level of related genes in goose primary hepatocytes. Poult Sci 2011; 90:402-9. [PMID: 21248338 DOI: 10.3382/ps.2010-00995] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
In this study, we investigated the role of liver X receptor (LXR) activation in hepatic assembly and in the secretion of very low density lipoprotein-triglycerides in goose primary hepatocytes. Goose primary hepatocytes were isolated and treated with the LXR agonist T0901317. Total triglyceride accumulation, intracellular and extracellular triglyceride concentrations, extracellular very low density lipoprotein concentration, and gene expression levels of LXRα, microsomal triglyceride transfer protein, acyl coenzyme A:diacylglycerol acyltransferase (DGAT) 1, and DGAT2 were measured in primary hepatocytes. We found a dose-dependent upregulation of total and intracellular TG accumulation when using 0, 0.01, 0.1, 1, and 10 μM T0901317, but the extracellular triglyceride and very low density lipoprotein concentrations were dose dependent only when the T0901317 concentration was below 1 μM; as compared with 1 μM T0901317, 10 μM T0901317 had an inhibiting effect (P < 0.05). The mRNA levels of all the detected genes increased in the presence of T0901317. The change in LXRα and DGAT1 was dose dependent, and the mRNA levels of microsomal triglyceride transfer protein and DGAT2 increased with a T0901317 concentration up to 1 μM, but decreased when treated with 10 μM T0901317 (P < 0.05). In conclusion, the secretion of very low density lipoprotein plays a role in pharmacologically activating the LXR-induced development of hepatocellular steatosis in geese.
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347
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Horikawa Y, Tsuchiya N, Yuasa K, Narita S, Saito M, Takayama K, Nara T, Tsuruta H, Obara T, Numakura K, Satoh S, Habuchi T, Hu X, Guo J, Lin Z, Sun L, Xu Z, Cang C, Wang G, Kanda T, Sakamoto K, Matsuki A, Ohashi R, Hirota S, Fujimori Y, Matsuda Y, Yajima K, Kosugi S, Hatakeyama K, Kitahara K, Watanabe M, Nakazono S, Wada N, Kakizaki H, Li J, Gong FJ, Sun PN, Shen L, Li Q, Li N, Qiu M, Liu J, Yi C, Luo D, Li Z, Gou H, Yang Y, Cao D, Shen Y, Wang X, Xu F, Bi F, Li Q, Zhang X, Li N, Wei W, Luo HY, Wang ZQ, Wang FH, Qiu MZ, Teng KY, Ruan DY, He YJ, Li YH, Xu RH, Matsusaka S, Mizunuma N, Suenaga M, Shinozaki E, Mishima Y, Terui Y, Hatake K, Nara E, Kodaira M, Mishima Y, Yokoyama M, Saotome T, Terui Y, Takahashi S, Hatake K, Nishimura N, Nakano K, Kodaira M, Ueda K, Yamada S, Mishima Y, Yokoyama M, Saotome T, Takahashi S, Terui Y, Hatake K, Nozawa M, Mochida Y, Nishigaki K, Nagae S, Uemura H, Oh SY, Jeong CY, Hong SC, Lee WS, Kim HG, Lee GW, Hwang IG, Jang JS, Kwon HC, Kang JH, Ozaka M, Ogura M, Matsusaka S, Shinozaki E, Suenaga M, Chin K, Mizunuma N, Hatake K, Pua PF, Ganzon D, Chan V, Sailaja K, Vishnupriya S, Raghunadharao D, Markandeya G, Reddy PRK, Reddanna P, Praveen D, Sakamoto K, Kanda T, Matsuki A, Takano T, Hanyu T, Yajima K, Kosugi S, Hirota S, Hatakeyama K, Shigekawa T, Ijichi N, Takayama S, Tsuda H, Ikeda K, Horie K, Osaki A, Saeki T, Inoue S, Subhashini J, Rajesh B, Rajesh I, Ravindran P, Takagi K, Chin K, Oba M, Kuboki Y, Ichimura T, Oto M, Kawazoe Y, Watanabe T, Ozaka M, Ogura M, Suenaga M, Shinozaki E, Matsusaka S, Mizunuma N, Hatake K, Ueda K, Saotome T, Yamada S, Nishimura N, Nara E, Nakano K, Kodaira M, Katsube A, Mishima Y, Terui Y, Yokoyama M, Takahashi S, Hatake K, Yao X, Yang Q, Li C, Diao L, Chen X, Yu Z, Zuo W, Wang Y, He Y, Zhang X, Cai S, Wang Z, Xu J, Zhan W, Zhang YF, Misumi M, Takeuchi H, Nakamiya N, Shigekawa T, Matsuura K, Fujiuchi N, Osaki A, Saeki T. CLINICAL OUTCOMES. Jpn J Clin Oncol 2011. [DOI: 10.1093/jjco/hyq254] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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348
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Jin HJ, Tu R, Xu F, Chen SF. Identification of nitrogen-fixing Paenibacillus from different plant rhizospheres and a novel nifH gene detected in the P. stellifer. Microbiology (Reading) 2011. [DOI: 10.1134/s0026261711010097] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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349
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Xu F, Chu F, Shepard JF, Trolier-McKinstry S. Measurement of Effective Longitudinal Piezoelectric Coefficient of thin Films by Direct Piezoelectric Effect. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-493-427] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTThis paper presents a new method for the measurement of the longitudinal piezoelectric coefficient of piezoelectric thin films using the direct piezoelectric effect. A uniform uniaxial stress was applied to the piezoelectric thin film by high-pressure gas and the induced charge was collected and measured by a charge integrator. The effective longitudinal piezoelectric coefficient of lead zirconate titanate (PZT) 52/48 thin films made by sol-gel processing was measured by this method. Undoped films typically have d33 values of ∼ 5 pC/N, while poled films have values up to 220 pC/N.
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350
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Chu F, Xu F, Shepard J, Trolier-McKinstry S. Thickness Dependence of the Electrical Properties of Sol-Gel Derived Lead Zirconate Titanate Thin Films with (111) and (100) Texture. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-493-409] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTCrack-free (111) and (100)-textured Pb(Zr0.52Ti0.48)O3 films with thicknesses ranging from 0.25 to 2.5 μm were prepared using a methoxyethanol-based precursor solution, multiple spin-coating and multiple crystallization steps. The thickness dependence of the dielectric, ferroelectric and piezoelectric properties were investigated on both (111) and (100) oriented PZT films. In both cases, the degree of preferred orientation did not change with thickness. It is found that the dielectric constant, remanent polarization and piezoelectric coefficients (d33 and d31) increase with increasing film thickness. The (100)-textured film showed higher dielectric constant but lower remanent polarization relative to (111) textured film. 1 μm was identified to be a critical thickness that marks the change of dielectric, ferroelectric and piezoelectric behaviors as a function of thickness.
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