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Effect of a multi-domain intervention on the quality of life in older adults with major neurocognitive disorder: A pilot study. Rev Neurol (Paris) 2021; 178:355-362. [PMID: 34565622 DOI: 10.1016/j.neurol.2021.06.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 04/02/2021] [Accepted: 06/16/2021] [Indexed: 11/30/2022]
Abstract
PURPOSE Major neurocognitive disorders (MND) have multiple negative consequences on patients' lives and on their caregivers' health. Occupational therapy and cognitive stimulation have failed to show any significant efficacy on quality of life (QoL), cognitive functioning and behavioural symptoms. Bretonneau Hospital's Day Care Unit offers personalized and structured multi-domain interventions to cognitively impaired older patients on a weekly basis, for a 3-month period. OBJECTIVES Our objective was to determine whether a specific rehabilitation day care unit (RDCU) could influence the QoL of cognitively impaired community-dwelling elderly patients. We also aimed to better understand the characteristics of patients who had the most benefited from the RDCU. METHODS Retrospective study based on a sample of outpatients participating in RDCU during three months. All patients underwent a cognitive (MMS), functional (IADl, ADL) and behavioral (NPI) assessment. We compared QoL using the QoL-Alzheimer's Disease (QoL-AD) scale before and after RDCU. RESULTS Overall, we included 60 outpatients in our study (mean age 83.3±5.8; women=70%). We found a statistically significant improvement of QoL-AD scores after RDCU (31.8±4.9 to 32.9±5.2, P=0.008). Patients who benefitted the most from RDCU were older (P=0.01) and had lower baseline QoL (P=0.04). We did not find any other characteristics associated with QoL-AD score improvement in our population. CONCLUSION RDCU showed positive effects on QoL in this uncontrolled pilot study of older adults with MND. These findings should be confirmed in a future randomized controlled trial to corroborate the potential benefits of RDCU on QoL in older cognitively impaired patients.
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Mind the gap! transition from child & adolescent to adult mental health services: A narrative review and results of 18 months consultation. Eur Psychiatry 2021. [PMCID: PMC9475609 DOI: 10.1192/j.eurpsy.2021.1072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Introduction Discontinuity in child and adolescent mental health services (CAMHS) and adult mental health services (AMHS) constitutes an important challenge in mental health care. In the last decade, efforts have been made to better define the transitioning population and build consensual models for CAMHS-AMHS’ transition. Objectives We aim to present our protocol and transition consultation results on the scope of published literature. Methods Description of protocol and casuistic of 18 months’ transition consultation at Centro Hospitalar Barreiro-Montijo. The literature found on PubMed was published from 2008 to 2020 and was reviewed using the keywords: transition, CAMHS, AMHS, adolescent, mental health service, young people. Articles with full text available written in English and French were selected. The included clinical studies focused on populations with neurodevelopmental disorders, psychotic disorders, non-suicidal self-harm and suicidal attempts. Results Forty-four articles were included, published from 2008 to 2020. 4 articles were excluded on basis of language and diagnosis criteria (eating disorders). Twelve were reviews, 24 were clinical studies and 4 were opinion articles. There are cultural and referral issues that explain the loss of patients in this transition gap. Individuals with history of severe mental illness were more frequently referred than those with neurodevelopmental disorders. Optimal transition is defined as adequate transition planning with a flexible age cut-off and continuity of care following transition. Conclusions For the vast majority of service users, transition from CAMHS to AMHS is poorly planned, executed and experienced. Improving transition models is essential to the patients autonomy’ promotion and a stronger adult mental health.
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Results on Low-Mass Weakly Interacting Massive Particles from an 11 kg d Target Exposure of DAMIC at SNOLAB. PHYSICAL REVIEW LETTERS 2020; 125:241803. [PMID: 33412014 DOI: 10.1103/physrevlett.125.241803] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2020] [Accepted: 11/04/2020] [Indexed: 06/12/2023]
Abstract
We present constraints on the existence of weakly interacting massive particles (WIMPs) from an 11 kg d target exposure of the DAMIC experiment at the SNOLAB underground laboratory. The observed energy spectrum and spatial distribution of ionization events with electron-equivalent energies >200 eV_{ee} in the DAMIC CCDs are consistent with backgrounds from natural radioactivity. An excess of ionization events is observed above the analysis threshold of 50 eV_{ee}. While the origin of this low-energy excess requires further investigation, our data exclude spin-independent WIMP-nucleon scattering cross sections σ_{χ-n} as low as 3×10^{-41} cm^{2} for WIMPs with masses m_{χ} from 7 to 10 GeV c^{-2}. These results are the strongest constraints from a silicon target on the existence of WIMPs with m_{χ}<9 GeV c^{-2} and are directly relevant to any dark matter interpretation of the excess of nuclear-recoil events observed by the CDMS silicon experiment in 2013.
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Dark Energy Survey Year 1 Results: Cosmological constraints from cluster abundances and weak lensing. Int J Clin Exp Med 2020. [DOI: 10.1103/physrevd.102.023509] [Citation(s) in RCA: 98] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Genetic markers for treatment-related pancreatitis in a cohort of Hispanic children with acute lymphoblastic leukemia. Support Care Cancer 2020; 29:725-731. [PMID: 32447501 DOI: 10.1007/s00520-020-05530-w] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Accepted: 05/14/2020] [Indexed: 12/15/2022]
Abstract
PURPOSE Treatment-related pancreatitis (TRP) is a serious complication occurring in children with acute lymphoblastic leukemia (ALL). Those affected are at high risk for severe organ toxicity and treatment delays that can impact outcomes. TRP is associated with asparaginase, a standard therapeutic agent in childhood ALL. Native American ancestry, older age, high-risk leukemia, and increased use of asparaginase are linked to pancreatitis risk. However, dedicated genetic studies evaluating pancreatitis in childhood ALL include few Hispanics. Thus, the genetic basis for higher risk of pancreatitis among Hispanic children with ALL remains unknown. METHODS Cases of children with ALL treated in from 1994 through 2013 were reviewed and identified 14, all Hispanic, who developed pancreatitis related to asparaginase therapy. Forty-six controls consisting of Hispanic children treated on the same regimens without pancreatitis were selected for comparison. Total DNA isolated from whole blood was used for targeted DNA sequencing of 23 selected genes, including genes associated with pancreatitis without ALL and genes involved in asparagine metabolism. RESULTS Non-synonymous polymorphisms and frameshift deletions were detected in 15 genes. Most children with TRP had variants in ABAT, ASNS, and CFTR. Notably, children with TRP harbored many more CFTR variants (71.4%) compared with controls (39.1%). Among these, V470M (rs213950) was most frequent (OR 4.27, p = 0.025). CONCLUSIONS This is the first study of genetic factors in treatment-related pancreatitis in Hispanic children with ALL. Identifying correlative variants in ethnically vulnerable populations may improve screening to identify which patients with ALL are at greatest risk for pancreatitis.
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Constraints on Light Dark Matter Particles Interacting with Electrons from DAMIC at SNOLAB. PHYSICAL REVIEW LETTERS 2019; 123:181802. [PMID: 31763884 DOI: 10.1103/physrevlett.123.181802] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 10/03/2019] [Indexed: 06/10/2023]
Abstract
We report direct-detection constraints on light dark matter particles interacting with electrons. The results are based on a method that exploits the extremely low levels of leakage current of the DAMIC detector at SNOLAB of 2-6×10^{-22} A cm^{-2}. We evaluate the charge distribution of pixels that collect <10e^{-} for contributions beyond the leakage current that may be attributed to dark matter interactions. Constraints are placed on so-far unexplored parameter space for dark matter masses between 0.6 and 100 MeV c^{-2}. We also present new constraints on hidden-photon dark matter with masses in the range 1.2-30 eV c^{-2}.
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Cosmological Constraints from Multiple Probes in the Dark Energy Survey. PHYSICAL REVIEW LETTERS 2019; 122:171301. [PMID: 31107093 DOI: 10.1103/physrevlett.122.171301] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Revised: 02/19/2019] [Indexed: 06/09/2023]
Abstract
The combination of multiple observational probes has long been advocated as a powerful technique to constrain cosmological parameters, in particular dark energy. The Dark Energy Survey has measured 207 spectroscopically confirmed type Ia supernova light curves, the baryon acoustic oscillation feature, weak gravitational lensing, and galaxy clustering. Here we present combined results from these probes, deriving constraints on the equation of state, w, of dark energy and its energy density in the Universe. Independently of other experiments, such as those that measure the cosmic microwave background, the probes from this single photometric survey rule out a Universe with no dark energy, finding w=-0.80_{-0.11}^{+0.09}. The geometry is shown to be consistent with a spatially flat Universe, and we obtain a constraint on the baryon density of Ω_{b}=0.069_{-0.012}^{+0.009} that is independent of early Universe measurements. These results demonstrate the potential power of large multiprobe photometric surveys and pave the way for order of magnitude advances in our constraints on properties of dark energy and cosmology over the next decade.
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First Direct-Detection Constraints on eV-Scale Hidden-Photon Dark Matter with DAMIC at SNOLAB. PHYSICAL REVIEW LETTERS 2017; 118:141803. [PMID: 28430473 DOI: 10.1103/physrevlett.118.141803] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Indexed: 06/07/2023]
Abstract
We present direct detection constraints on the absorption of hidden-photon dark matter with particle masses in the range 1.2-30 eV c^{-2} with the DAMIC experiment at SNOLAB. Under the assumption that the local dark matter is entirely constituted of hidden photons, the sensitivity to the kinetic mixing parameter κ is competitive with constraints from solar emission, reaching a minimum value of 2.2×10^{-14} at 17 eV c^{-2}. These results are the most stringent direct detection constraints on hidden-photon dark matter in the galactic halo with masses 3-12 eV c^{-2} and the first demonstration of direct experimental sensitivity to ionization signals <12 eV from dark matter interactions.
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End of Life Issues for AYA Patients Post Allogeneic Hematopoietic Stem Cell Transplants. Biol Blood Marrow Transplant 2017. [DOI: 10.1016/j.bbmt.2016.12.401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Survival Outcomes Are Similar for Younger and Older AYA Patients Post Allogeneic Hematopoeitic Stem Cell Transplants. Biol Blood Marrow Transplant 2016. [DOI: 10.1016/j.bbmt.2015.11.830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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SEARCH FOR GAMMA-RAY EMISSION FROM DES DWARF SPHEROIDAL GALAXY CANDIDATES WITH
FERMI
-LAT DATA. ACTA ACUST UNITED AC 2015. [DOI: 10.1088/2041-8205/809/1/l4] [Citation(s) in RCA: 119] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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RT-35 * ELAPSED DAYS AFTER RADIOTHERAPY FOR GLIOBLASTOMA. Neuro Oncol 2014. [DOI: 10.1093/neuonc/nou270.31] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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RT-36 * ONCOLOGIC OUTCOME OF HISPANIC PATIENTS WITH GLIOBLASTOMA TREATED WITH RADIOTHERAPY. Neuro Oncol 2014. [DOI: 10.1093/neuonc/nou270.32] [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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Reduced binding of human antibodies to cells from GGTA1/CMAH KO pigs. Am J Transplant 2014; 14:1895-900. [PMID: 24909344 PMCID: PMC4366649 DOI: 10.1111/ajt.12744] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2014] [Revised: 03/07/2014] [Accepted: 03/12/2014] [Indexed: 01/25/2023]
Abstract
Xenotransplantation using genetically modified pig organs could solve the donor organ shortage problem. Two inactivated genes that make humans unique from pigs are GGTA1 and CMAH, the products of which produce the carbohydrate epitopes, aGal and Neu5Gc that attract preformed human antibody. When the GGTA1 and CMAH genes were deleted in pigs, human antibody binding was reduced in preliminary analysis. We analyzed the binding of human IgM and IgG from 121 healthy human serum samples for binding to GGTA1 KO and GGTA1/CMAH KO peripheral blood mononuclear cells (PBMCs). We analyzed a sub population for reactivity toward genetically modified pig PBMCs as compared to chimpanzee and human PBMCs. Deletion of the GGTA1 and CMAH genes in pigs improved the crossmatch results beyond those observed with chimpanzees. Sorting the 121 human samples tested against the GGTA1/CMAH KO pig PBMCs did not reveal a distinguishing feature such as blood group, age or gender. Modification of genes to make pig carbohydrates more similar to humans has improved the crossmatch with human serum significantly.
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Abstract P5-12-07: Triple-negative breast cancer in African American women - How women in New Orleans compare to the rest of Louisiana and the Nation. Cancer Res 2013. [DOI: 10.1158/0008-5472.sabcs13-p5-12-07] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: For years clinicians have made the empirical observation that there is an unusually high number of African American women (AAW) with triple-negative (Tneg) breast cancer (BC) in New Orleans (NO). Knowing the rate of Tneg BC in AAW is higher than white women (WW), we explored the hypothesis that AAW in NO have a higher rate of Tneg BC when compared to AAW in the rest of Louisiana (LA) and the US.
Methods: We analyzed data from the Louisiana Tumor Registry, one of the NCI funded SEER registries, for the tumor characteristics of invasive female BC diagnosed in 2010, focusing on racial disparities; HER2 status was not available prior to 2010. We explored the association of HER2 status with age, race, ER, PR, T, N and M status to determine crude and adjusted odds ratios and rate distribution of subtypes using SEER*Stat and SAS programs. With the recent release of SEER 18 data including HER2 status in cases diagnosed in 2010 we also looked at national rates of Tneg BC in WW compared to AAW and compared these findings to NO and LA.
Results: Overall age-adjusted incidence rate of Tneg BC in AAW was 34.0 per 100,000 in NO, 27.2 per 100,000 in AAW in the rest of LA and 20.4 per 100,000 in SEER 18. This translates into a statistically significant increase in incidence rates of Tneg BC in AAW in NO by 67% (p = < 0.05) compared to SEER 18. The rates in WW were 11.3 per 100,000 in all 3 locations. AAW with Tneg BC in NO were more likely to have more aggressive BC. Young age, black race, large tumor size, higher grade and TNM stage were significantly associated with the high risk of Tneg BC. After adjusting for age, geographic area, and other tumor characteristics, the higher risk of Tneg BC in AAW remained in NO compared with the rest of LA and locations of the SEER 18 registries.
Table 1: 2010 Tneg rates per 100,000 in NO, LA and SEER 18 RateCountRate RatioRate Lower CIRate Upper CIWhiteSEER 1811.33884154 LA11.30512000.99700.85731.1543 NO11.2441320.99160.66501.4340BlackSEER 1820.39961094 LA27.18622041.33271.13841.5534 NO34.0092611.66721.25822.1711
Conclusions: The incidence rates of Tneg BC in AAW in NO and LA are significantly higher than in SEER 18, with rates in NO being the highest. Rates of Tneg BC in WW in all data sets were similar. SEER 18 analysis also confirms a higher incidence of Tneg BC in AAW compared with WW as previously reported in smaller case series. AAW in NO are more likely to have poorly differentiated and Tneg BC compared to AAW in the rest of LA. This newly identified disparity in the AAW population in NO has clinical implications and translational research potential as it enables us to broaden the understanding and treatment of this aggressive disease.
Citation Information: Cancer Res 2013;73(24 Suppl): Abstract nr P5-12-07.
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Abstract
BACKGROUND Medullary thyroid cancer (MTC) is frequently associated with mutations in the tyrosine kinase Ret and with increased expression of vascular endothelial growth factor (VEGF) and VEGF receptor 2 (VEGFR2). Motesanib is an investigational, orally administered small molecule antagonist of VEGFR1, 2, and 3; platelet-derived growth factor receptor (PDGFR); Kit; and possibly Ret. AIM The aim of this study was to investigate the effects of motesanib on wildtype and mutant Ret activity in vitro and on tumor xenograft growth in a mouse model of MTC. METHODS/RESULTS In cellular phosphorylation assays, motesanib inhibited the activity of wild-type Ret (IC(50)=66 nM), while it had limited activity against mutant Ret C634W (IC(50)=1100 nM) or Ret M918T (IC(50)>2500 nM). In vivo, motesanib significantly inhibited the growth of TT tumor cell xenografts (expressing Ret C634W) and significantly reduced tumor blood vessel area and tumor cell proliferation, compared with control. Treatment with motesanib resulted in substantial inhibition of Ret tyrosine phosphorylation in TT xenografts and, at comparable doses, in equivalent inhibition of VEGFR2 phosphorylation in both TT xenografts and in mouse lung tissue. CONCLUSIONS The results of this study demonstrate that motesanib inhibited thyroid tumor xenograft growth predominantly through inhibition of angiogenesis and possibly via a direct inhibition of VEGFR2 and Ret expressed on tumor cells. These data suggest that targeting angiogenesis pathways and specifically the VEGF pathway may represent a novel therapeutic approach in the treatment of MTC.
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Abstract
ABSTRACTThe shape of the normalized temperature derivative of the dc susceptibility provides useful information about superconducting materials. We propose that the position of the derivative peak be defined as the transition temperature Tc and the width of this peak define its sharpness.
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Multiorgan engraftment of human somatic cells in swine foetuses after intra-blastocyst transplantation. Reprod Domest Anim 2010; 46:630-5. [PMID: 21092066 DOI: 10.1111/j.1439-0531.2010.01718.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Adult human stem cells, mainly from hematopoietic lineage, have been injected into developing pre-immune animal foetuses, and xenogenic engraftment of liver and other organs has been reported. We isolated a rare cell population from adult human liver, fat and skin. Colonies with few cells became visible as early as 2-3 days, and a fully formed colony took 10-14 days to form. These colonies were named as liver-derived cell lines (LDCs), fat-derived cell lines (FDCs) and skin-derived cell lines (SDCs). All these cells express few pluripotency markers like Klf4, c-myc and Sox2. Pig blastocysts were injected with LDCs, FDCs and SDCs and transferred to recipient pigs. We achieved an overall pregnancy rate of 71.4% at day 35. The foetuses were analysed for human cell chimerism in liver, kidney and heart both by RT-PCR and real-time PCR using primers specific to human and pig mitochondrial DNA. The percentage of foetuses showing chimerism was 17.4% (4/23), 12.5% (2/16) and 11.1% (1/9) for LDCs, FDCs and SDCs, respectively. Of these, 42.9% (three out of seven) showed chimerism in liver and 71.4% (five out of seven) showed kidney chimerism. However, we did not detect any chimerism in the heart. The level of chimerism varied and was in the range of one human cell per one hundred thousand to one million pig cells.
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66 ISOLATION, CHARACTERIZATION, AND NUCLEAR REPROGRAMMING OF STEM CELLS DERIVED FROM ADULT PORCINE LIVER AND FAT. Reprod Fertil Dev 2010. [DOI: 10.1071/rdv22n1ab66] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Genetic manipulation of the porcine genome to produce genetically modified pigs for various biomedical and agriculture applications has been hampered by the lack of an ideal cell type that can grow in culture for a long period of time and is amenable to various genetic manipulations with high efficiency. The cell type currently used for various genetic manipulations is fetal fibroblast. These cells have very limited life span in culture and the efficiency of gene targeting is very low. There is no report of isolation of functional embryonic stem cells (ESC) from pig that would have been used to produce transgenic pigs with high efficiency as has been possible in mice. Recently, porcine induced pluripotent stem cells (iPSC) have been reported by 3 groups. However, they have yet to be tested for genetic manipulations and production of transgenic pigs. In this study, we developed a simple but novel strategy to recover stem cells from adult porcine liver and adipose tissues. Small colonies with few cells became visible as early as 2 to 3 days under reduced oxygen conditions on collagen-coated plates, and a full-grown colony with a fibroblast-like morphology took 10 to 14 days to form. Ten single colonies per tissue were isolated, subcultured, and monitored for growth and gene expression. Both of these cell types maintained steady growth through 70 population doublings (at the time of writing) and are still growing without any change in their morphology. Reverse transcription PCR was used to monitor gene expression. Both cell types show strong expression of c-Myc and KLF4. Moreover, low expression of Oct-4 and Lin28, 2 important genes related to pluripotency, was also detected in cells derived from adipose tissues, indicating that these cells could be easily reprogrammed to pluripotent state. These cells maintained a normal karyotype after long-term culture. Cell lines with stable genetic modifications and extended expression of transgene were obtained when these cells were transfected with a plasmid containing the neomycin resistance gene and selected under G418. Further, these 2 cell types, liver stem cells (LSC) and fat stem cells (FSC), and fetal fibroblasts (FF) as a control were used as nuclear donors to produce somatic cell nuclear transfer (SCNT) embryos. The average fusion rates were 87, 81, and 89% for LSC, FSC, and FF, respectively. Of 2 recipients receiving nuclear transfer embryos produced with each cell type, one established pregnancy at Day 30 (50%). Efficiencies were 5% (11 fetuses/223 embryos transferred), 1.8% (4 fetuses/228 embryos transferred),and 5% (11 fetuses/219 embryos transferred) for LSC, FSC, and FF, respectively. Thus, these adult liver and fat stem cells are attractive cell types for cloning valuable adult animals with high efficiency and for SCNT transgenesis.
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Abstract
Barriers to care contribute to health inequities for immigrant populations. Although inadequate health insurance is a known barrier, other factors impact the issue. Few instruments exist to specifically measure these other barriers. The purpose of this study was to test the Immigrant Barriers to Health Care Scale - Hispanic Version. It was first pilot-tested in southern California with a Mexican population. After refinement, the instrument was tested in a north-eastern sample of diverse Hispanic adults. The data were analyzed using exploratory factor analysis. Factor loadings and communalities were used to assess the adequacy of the scale's items. Six items were deleted due to ambiguous factor loadings. The final 11 items loaded onto four factors and explained 54.58% of the variance. The coefficient alpha was 0.81 for the instrument. The Immigrant Barriers to Health Care Scale is a reliable and valid tool. Its further use and reporting with other socially and economically disadvantaged groups is advised.
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Parameters Affecting Cell Binding to Lectin Beads in Carbohydrate‐Based Drug Development. FASEB J 2008. [DOI: 10.1096/fasebj.22.1_supplement.808.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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CT scan in patients with suspected appendicitis: clinical implications for the acute care surgeon. Eur Surg Res 2007; 40:211-9. [PMID: 17998781 DOI: 10.1159/000110863] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2007] [Accepted: 08/22/2007] [Indexed: 01/29/2023]
Abstract
OBJECTIVE To determine the influence of computed tomography (CT) scans on diagnosis and management of patients with suspected appendicitis. METHODS Retrospective 2-year review of 1,630 patients with suspected appendicitis, categorized into three groups based on the likelihood (Alvarado scores) of having appendicitis. Group 1: low likelihood (Alvarado score < or =4); group 2: intermediate likelihood (Alvarado scores 5-7), and group 3: high likelihood (Alvarado score > or = 8). CT scan utilization, hospital course, and final pathology were retrospectively reviewed. RESULTS More patients received a CT scan in 2006 as compared with 2005 (60 vs. 52%; p = 0.001). The overall appendectomy rate was similar between the 2 years (57% in 2005 vs. 57% in 2006; p = 0.995). The overall appendectomy rate in patients with a CT was significantly higher as compared with those without (60 vs. 53%; p = 0.002). The appendectomy rate in patients with Alvarado scores < or =4 and no CT scan was significantly lower than in those with a CT scan (12 vs. 48%; p < 0.0001). The overall negative appendectomy rate in patients with a CT scan was similar to that in those without: 31/546 (6%) vs. 23/383 (6%). CONCLUSIONS CT scan utilization increased the appendectomy rate only in patients with a low clinical suspicion for appendicitis. Preoperative CT scans did not decrease the negative appendectomy rate.
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Demographic correlates of body size changes in children undergoing treatment for acute lymphoblastic leukemia. Pediatr Blood Cancer 2007; 49:793-6. [PMID: 17066457 DOI: 10.1002/pbc.21063] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
INTRODUCTION While it is known that leukemia therapy is associated with obesity in survivorship, limited information is available on its time-related pattern of development and its variation across patient subgroups. The goal of the present study was to examine demographic correlates of body mass index (BMI) changes over time from diagnosis through chemotherapy for children with B-precursor acute lymphoblastic leukemia (ALL). METHODS The study cohort consisted of 307 pediatric patients diagnosed with ALL who were treated at four South Texas pediatric oncology centers between 1990 and 2002. To minimize treatment-related variability, we excluded patients who received cranial irradiation as part of their treatment. Variation in age- and gender-standardized BMI z-scores according to age at diagnosis, gender, and ethnicity were assessed. RESULTS The overall study cohort exhibited an increase in age- and gender-adjusted BMI z-scores for the first 24 months of chemotherapy followed by a slight decrease in BMI at 30 months (end of therapy). A repeated measures analysis indicated a statistically significant difference in the time-related pattern of BMI changes for age at diagnosis (P = 0.001) but no significant effect for gender (P = 0.32) or Hispanic versus non-Hispanic ethnicity (P = 0.89). DISCUSSION In our cohort of ALL patients, BMI was elevated at diagnosis (mean standardized BMI z-score = 0.22, standard deviation = 1.4) then increased and remained elevated for the entire duration of chemotherapy. Children who were 2-9 years of age at diagnosis began therapy with a substantially lower BMI and remained lower over the course of chemotherapy than patients aged 10-18 years at diagnosis. It will be important for future investigations to explore the biological and behavioral factors that may underlie such differential patterns of BMI change over time.
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Determination of fermentation rates in maize land
races used as forage in central Mexico. JOURNAL OF ANIMAL AND FEED SCIENCES 2007. [DOI: 10.22358/jafs/74457/2007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Measurement of the Bs(0) lifetime using semileptonic decays. PHYSICAL REVIEW LETTERS 2006; 97:241801. [PMID: 17280267 DOI: 10.1103/physrevlett.97.241801] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2006] [Indexed: 05/13/2023]
Abstract
We report a measurement of the Bs(0) lifetime in the semileptonic decay channel Bs(0) --> Ds- mu+ nuX (and its charge conjugate), using approximately 0.4 fb(-1) of data collected with the D0 detector during 2002-2004. Using 5176 reconstructed Ds- mu+ signal events, we have measured the Bs(0) lifetime to be tau(Bs(0))=1.398+/-0.044(stat)(-0.025)(+0.028)(syst) ps. This is the most precise measurement of the Bs(0) lifetime to date.
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Search for the standard model Higgs Boson in the pp[over]-->ZH-->nunu[over]bb[over] channel. PHYSICAL REVIEW LETTERS 2006; 97:161803. [PMID: 17155384 DOI: 10.1103/physrevlett.97.161803] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2006] [Indexed: 05/12/2023]
Abstract
We report a search for the standard model (SM) Higgs boson based on data collected by the D0 experiment at the Fermilab Tevatron Collider, corresponding to an integrated luminosity of 260 pb(-1). We study events with missing transverse energy and two acoplanar b jets, which provide sensitivity to the ZH production cross section in the nunu[over]bb[over] channel, and to WH production when the lepton from the W-->lnu decay is undetected. The data are consistent with the SM background expectation, and we set 95% C.L. upper limits on sigma(pp[over]-->ZH/WH)xB(H-->bb[over]) from 3.4/8.3 to 2.5/6.3 pb, for Higgs-boson masses between 105 and 135 GeV.
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Search for associated higgs boson production WH-->WWW*-->l+/-nul'+/-nu'+X in pp collisions at square root s=1.96 Te V. PHYSICAL REVIEW LETTERS 2006; 97:151804. [PMID: 17155320 DOI: 10.1103/physrevlett.97.151804] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2006] [Indexed: 05/12/2023]
Abstract
We present a search for associated Higgs boson production in the process pp-->WH-->WWW*-->l;+/-nul'+/-nu'+X in final states containing two like-sign isolated electrons or muons (e+/-e;+/-, e+/-micro+/-, or micro+/-micro+/-). The search is based on D0 run II data samples corresponding to integrated luminosities of 360-380 pb-1. No excess is observed over the predicted standard model background. We set 95% C.L. upper limits on sigma(pp-->WH)xBr(H-->WW*) between 3.2 and 2.8 pb for Higgs boson masses from 115 to 175 GeV.
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Search for neutral Higgs bosons decaying to tau pairs in pp[over ] collisions at sqrt[s]=1.96 TeV. PHYSICAL REVIEW LETTERS 2006; 97:121802. [PMID: 17025951 DOI: 10.1103/physrevlett.97.121802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2006] [Indexed: 05/12/2023]
Abstract
A search for the production of neutral Higgs bosons Phi decaying into tau(+)tau(-) final states in pp[over ] collisions at a center-of-mass energy of 1.96 TeV is presented. The data, corresponding to an integrated luminosity of approximately 325 pb(-1), were collected by the D0 experiment at the Fermilab Tevatron Collider. Since no excess compared to the expectation from standard model processes is found, limits on the production cross section times branching ratio are set. The results are combined with those obtained from the D0 search for Phib(b[over ])-->bb[over ]b(b[over ]) and are interpreted in the minimal supersymmetric standard model.
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Search for resonant second generation slepton production at the Fermilab Tevatron. PHYSICAL REVIEW LETTERS 2006; 97:111801. [PMID: 17025876 DOI: 10.1103/physrevlett.97.111801] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2006] [Indexed: 05/12/2023]
Abstract
We present a search for supersymmetry in the R-parity violating resonant production and decay of smuons and muon sneutrinos in the channels mu-->chi(1)(0)mu, mu-->chi(2,3,4)(0)mu, and nu(mu)-->chi(1,2)(+/-)mu. We analyzed 0.38 fb(-1) of integrated luminosity collected between April 2002 and August 2004 with the D0 detector at the Fermilab Tevatron Collider. The observed number of events is in agreement with the standard model expectation, and we calculate 95% C.L. limits on the slepton production cross section times branching fraction to gaugino plus muon, as a function of slepton and gaugino masses. In the framework of minimal supergravity, we set limits on the coupling parameter lambda(211)('), extending significantly previous results obtained in Run I of the Tevatron and at the CERN LEP collider.
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Abstract
Acute lymphoblastic leukemia (ALL), the most common malignancy in children, constitutes 25% of all pediatric cancer. Childhood cancer patients who are obese at diagnosis represent a particular challenge for the oncologist. Obesity may complicate chemotherapy dose determination, and has been associated with decreased overall and event-free survival in a number of adult cancer patients, and more recently in pediatric patients. The purpose of the present study was to examine whether obesity at diagnosis was associated with decreased overall and event-free survival in a cohort of 322 predominantly Hispanic pediatric patients with B-precursor ALL. Obesity was classified as an age-standardized and sex-standardized body mass index z-score at or above the 95th percentile. Hazard ratios (HRs) for overall and event-free survival were assessed using Cox proportional hazards regression modeling. Obesity at diagnosis was not associated with decreased overall survival (HR = 1.40, 95% confidence interval = 0.69-2.87) or event-free survival (HR = 1.08, 95% confidence interval = 0.65-1.82) in the overall cohort or in either of the 2 age-at-diagnosis (2 to 9 y; 10 to 18 y) subgroups. Our finding of no obesity-related prognostic effect in the overall cohort and in the under 2 to 9-year age-at-diagnosis cohort was consistent with the previous large-scale study of ALL patients; the absence of a prognostic effect in the 10 to 18-year age-at-diagnosis cohort, however, conflicted with previous findings.
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Direct limits on the oscillation frequency. PHYSICAL REVIEW LETTERS 2006; 97:021802. [PMID: 16907434 DOI: 10.1103/physrevlett.97.021802] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2006] [Indexed: 05/11/2023]
Abstract
We report results of a study of the B(s)(0) oscillation frequency using a large sample of B(s)(0) semileptonic decays corresponding to approximately 1 fb(-1) of integrated luminosity collected by the D0 experiment at the Fermilab Tevatron Collider in 2002-2006. The amplitude method gives a lower limit on the B(s)(0) oscillation frequency at 14.8 ps(-1) at the 95% C.L. At delta m(s) = 19 ps(-1), the amplitude deviates from the hypothesis A= 0(1) by 2.5 (1.6) standard deviations, corresponding to a two-sided C.L. of 1% (10%). A likelihood scan over the oscillation frequency, delta m(s), gives a most probable value of 19 ps(-1) and a range of 17 < delta m(s) < 21 ps(-1)at the 90% C.L., assuming Gaussian uncertainties. This is the first direct two-sided bound measured by a single experiment. If delta m(s) lies above 22 ps(-1), then the probability that it would produce a likelihood minimum similar to the one observed in the interval 16-22 ps(-1) is (5.0 +/- 0.3)%.
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Forma inusual de inicio de diabetes mellitus en paciente con hipertensión arterial refractaria a tratamiento. Rev Clin Esp 2006; 206:255-6. [PMID: 16750115 DOI: 10.1157/13088572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
Malignant melanoma has a high relapse rate, and PET is very useful for its detection, above all when its size is small or it is in locations that are difficult to resect. The radioguided surgery being implanted in many sites, new expectations are opening in these situations--the intraoperative location of the lesions by 18F-FDG and detection probe. This is a case report of a 44 years old woman diagnosed of malignant melanoma in her left leg 12 years ago. At present, she has a tumor in her left thigh, which was no longer palpable after a fine needle puncture was performed. This was reported as a mesenchymal tumor. Due to the possibility of recurrent melanoma, need for excision was suggested. In order to locate it, a PET-CT study with 18F-FDG was performed and the lesion was marked on the skin with the help of metallic points. The lesion was located in surgery with a gamma probe, showing relapse of melanoma. The importance of the case is found in the fact that it is the first step to extend the indications of radioguided surgery with the use of PET, a technique that offers a ride range of possibilities.
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Search for the Higgs boson in H --> WW(*) decays in pp collisions at square root of 1.96 TeV. PHYSICAL REVIEW LETTERS 2006; 96:011801. [PMID: 16486437 DOI: 10.1103/physrevlett.96.011801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2005] [Indexed: 05/06/2023]
Abstract
We present a search for the standard model Higgs boson in H --> WW(*) decays with e+e-, e+/-mu-/+, and mu+mu- final states in pp collisions at a center-of-mass energy of square root of s = 1.96 TeV. The data, collected from April 2002 to June 2004 with the D0 detector, correspond to an integrated luminosity of 300-325 pb(-1), depending on the final state. The number of events observed is consistent with the expectation from backgrounds. Limits from the combination of all three channels on the Higgs boson production cross section times branching ratio sigma x BR(H --> WW(*) are presented.
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263 USE OF PORCINE PARTHENOTES AND GENE EXPRESSION PROFILING USING MICROARRAYS FOR IDENTIFICATION OF IMPRINTED GENES. Reprod Fertil Dev 2006. [DOI: 10.1071/rdv18n2ab263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Genomic imprinting arises from differential epigenetic markings including DNA methylation and histone modifications and results in one allele being expressed in a parent-of-origin specific manner. For further insight into the porcine epigenome, gene expression profiles of parthenogenetic (PRT; two maternally derived chromosome sets) and biparental embryos (BP; one maternal and one paternal set of chromosomes) were compared using microarrays. Comparison of the expression profiles of the two tissue types permits identification of both maternally and paternally imprinted genes and thus the degree of conservation of imprinted genes between swine and other mammalian species. Diploid porcine parthenogenetic fetuses were generated using follicular oocytes (BOMED, Madison, WI, USA). Oocytes with a visible polar body were activated using a single square pulse of direct current of 50 V/mm for 100 �s and diploidized by culture in 10 �g/mL cycloheximide for 6 h to limit extrusion of the second polar body. Following culture, BP embryos obtained by natural matings, and PRT embryos, were surgically transferred to oviducts on the first day of estrus. Fetuses recovered at 28-30 days of gestation were dissected to separate viscera including brain, liver, and placenta; the visceral tissues were then flash-frozen in liquid nitrogen. Porcine fibroblast tissue was obtained from the remaining carcass by mincing, trypsinization, and plating cells in �-MEM. Total RNA was extracted from frozen tissue or cell culture using RNA Aqueous kit (Ambion, Austin, TX, USA) according to the manufacturer's protocol. Gene expression differences between BP and PRT tissues were determined using the GeneChip� Porcine Genome Array (Affymetrix, Santa Clara, CA) containing 23 256 transcripts from Sus scrofa and representing 42 genes known to be imprinted in human and/or mice. Triplicate arrays were utilized for each tissue type, and for PRT versus BP combination. Significant differential gene expression was identified by a linear mixed model analysis using SAS 5.0 (SAS Institute, Cary, NC, USA). Storey's q-value method was used to correct for multiple testing at q d 0.05. The following genes were classified as imprinted on the basis of their expression profiles: In fibroblasts, ARHI, HTR2A, MEST, NDN, NNAT, PEG3, PLAGL1, PEG10, SGCE, SNRPN, and UBE3A; in liver, IGF2, PEG3, PLAGL1, PEG10, and SNRPN; in placenta, HTR2A, IGF2, MEST, NDN, NNAT, PEG3, PLAGL1, PEG10, and SNRPN; and in brain, none. Additionally, several genes not known to be imprinted in humans/mice were highly differentially expressed between the two tissue types. Overall, utilizing the PRT models and gene expression profiles, we have identified thirteen genes where imprinting is conserved between swine and humans/mice, and several candidate genes that represent potentially imprinted genes. Presently, our efforts are focused in the identification of single nucleotide polymorphisms (SNPs) to more carefully evaluate the behavior of these genes in normal and abnormal gestations and to test whether the candidate genes are indeed imprinted.
This research was supported by USDA-CSREES grant 524383 to J. P. and B. F.
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32 CRYOPRESERVATION OF DONOR CELLS FOR NUCLEAR TRANSFER: EFFECT OF CELL FREEZING METHOD ON THE EFFICIENCY OF SOMATIC CELL NUCLEAR TRANSFER IN PIGS. Reprod Fertil Dev 2006. [DOI: 10.1071/rdv18n2ab32] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Donor cell quality is one of the most important factors affecting somatic cell nuclear transfer (SCNT) in mammals. Many studies have been carried out to improve the donor cell characteristics in nuclear transfer, including studies on cell type, cell cycle stage, cell passage, and handling of donor cells before the SCNT. Even though most SCNT work is done with donor cells that have been previously frozen and thawed, no studies have been conducted to evaluate the effect of the cell freezing rate on the SCNT efficiency. The objective of this experiment was to evaluate the effect of the cell freezing method on development of pig SCNT embryos in vitro. Fibroblasts were collected from a 29-day-old female fetus, suspended in DMEM-F12 + 40% fetal bovine serum (FBS) + 10% dimethyl sulfoxide (DMSO), and placed in 1.6-mL cryovials for freezing. Vials were randomly assigned to two treatments: In treatment 1, cells were frozen at a controlled rate of 1�C/min in a programmable machine (P) until -40�C, and then plunged into liquid nitrogen (LN2; -196�C). In treatment 2, the traditional system (T), vials were placed in a styrofoam box and left overnight in a freezer at -80�C. The next day samples were plunged into LN2 (196�C). For each treatment, cells were thawed and cultured until confluence before being used for SCNT. Cells were used at passages 2 and 6. Cumulus-oocyte complexes (COCs) were aspirated from slaughterhouse ovaries and cultured for 39 h in TCM 199 supplemented with 10% porcine follicular fluid (pFF), 5 �g/mL insulin, 10 ng/mL epidermal growth factor (EGF), 0.6 mM cysteine, 0.2 mM pyruvate, 25 �g/mL gentamycin and 5 �g/mL each of equine and human chorionic gonadotropin (eCG and hCG). Oocytes were stained with bisbenzimide and enucleated in manipulation media with 7.5 �g/mL cytochalasin B by removing the first polar body and metaphase plate by means of a 16-�m beveled glass pipette. Cells from each treatment were injected into the perivitelline space of recipient enucleated oocytes and fused by two DC pulses of 140 V for 50 �s in fusion media. The fusion rate was evaluated 1 h later, and reconstructed oocytes were activated by two DC pulses of 120 V for 60 �s. After activation, oocytes were placed in bicarbonate-buffered NCSU-13 with 0.4% BSA and cultured at 38.5�C, 5% CO2 in a humidified atmosphere. Embryos were observed for cell cleavage at Day 2, and blastocyst development rate and cell number counting were done at Day 7 of culture. Every experiment was repeated three times. The temperature descending rate for P was slower and more linear (1�C/min vs. 2�C/min) than for the T method. Fusion rate was not significantly affected (P < 0.05) by the freezing method when they were evaluated either individually at each passage or accumulated regardless the passage (78.9 � 3.6% vs. 79.4 � 6.3%) for P and T, respectively. The same trends were observed for cleavage (61.2 � 5.2% vs. 64.3 � 5.2%), blastocyst development (4.2 � 1.8% vs. 5.0 � 2.8%), and number of cells at the blastocyst stage (19.4 � 3.1 vs. 19.8 � 6.2) for P and T, respectively. The present findings indicate that blastocyst development after SCNT does not differ when fetal fibroblasts donor cells are frozen by the two methods tested.
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Abstract
BACKGROUND Transient hyperglycemia occurs commonly during the treatment for childhood acute lymphoblastic leukemia (ALL). The purpose of this study was to examine the incidence of and risk factors for transient hyperglycemia during induction chemotherapy in Hispanic pediatric patients diagnosed with B-Precursor ALL. PROCEDURE The study cohort consisted of 155 Hispanic pediatric patients diagnosed with ALL and treated at one of two South Texas pediatric oncology centers between 1993 and 2002. Hyperglycemia was defined as > or = 2 glucose determinations of > or = 200 mg/dl during the first 28 days of induction chemotherapy. RESULTS Overall, 11.0% of the study cohort developed transient hyperglycemia during induction chemotherapy. Age and body mass index (BMI) were both positively associated with the risk of hyperglycemia. Females exhibited a substantially higher risk of hyperglycemia than males, but this association did not reach statistical significance after adjusting for other covariates. Among patients who developed hyperglycemia, 100% of those who required insulin were in the 13-18-year age group and reported a family history of diabetes. Hyperglycemic patients classified as obese (BMI > or = 95 centile) were more than twice as likely to have required insulin therapy compared to overweight patients (BMI 85-<95 centile) and three times as likely to have required insulin compared to normal weight (BMI < 85 centile) patients. CONCLUSIONS The incidence of chemotherapy-induced transient hyperglycemia in the present study cohort is comparable to that reported in previous pediatric ALL patients. This finding is interesting in view of the elevated prevalence of obesity and the underlying dietary behaviors in this Hispanic study cohort.
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Measurement of the lifetime difference in the B0(s) system. PHYSICAL REVIEW LETTERS 2005; 95:171801. [PMID: 16383817 DOI: 10.1103/physrevlett.95.171801] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2005] [Indexed: 05/05/2023]
Abstract
We present a study of the decay B0(s) --> J/psiphi. We obtain the CP-odd fraction in the final state at time zero, Rperpendicular = 0.16 +/- 0.10(stat) +/- 0.02 (syst), the average lifetime of the (B0(s), B0(s)) system, tau(B0(s)) = 1.39(+0.13)(-0.16)(stat)(+0.01)(-0.02)(syst) ps, and the relative width difference between the heavy and light mass eigenstates, DeltaGamma/Gamma tripple bond (GammaL - GammaH)/Gamma = 0.24(+0.28)(-0.38)(stat)(+0.03)(-0.04)(syst). With the additional constraint from the world average of the lifetime measurements using semileptonic decays, we find tau(B0(s)) = 1.39 +/- 0.06 ps and DeltaGamma/Gamma = 0.25(+0.14)(-0.15). For the ratio of the B0(s) and B0 lifetimes we obtain tau(B0(s))/tau(B0) = 0.91 +/- 0.09(stat) +/- 0.003(syst).
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Measurement of semileptonic branching fractions of B mesons to narrow D** states. PHYSICAL REVIEW LETTERS 2005; 95:171803. [PMID: 16383819 DOI: 10.1103/physrevlett.95.171803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2005] [Indexed: 05/05/2023]
Abstract
Using the data accumulated in 2002-2004 with the D0 detector in proton-antiproton collisions at the Fermilab Tevatron collider with a center-of-mass energy of 1.96 TeV, the branching fractions of the decays B --> D0(1)(2420)mu+ vmuX and B --> D2(*0)(2460)mu+ vmuX and their ratio have been measured: B(b --> B) x B(B --> D0(1)mu+ vmuX) x B(D0(*0) --> D*- pi+) = [0.087 +/- 0.007(stat) +/- 0.014(syst)]%; B(b --> B) x B(B --> D2(*0) mu+ vmuX) x B(D2(*0) --> D*- pi+) = [0.035 +/- 0.007(stat) +/- 0.008(syst)]% and [B(B --> D2(*0)mu+ vmuX) x B(D2(*0) --> D*- pi+)]/[B(B --> D0(1)mu+ vmuX) x B(D0(1) --> D*- pi+)] = 0.39 +/- 0.09(stat) +/- 0.12 (syst), where the charge conjugated states are always implied.
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Search for large extra spatial dimensions in dimuon production with the d0 detector. PHYSICAL REVIEW LETTERS 2005; 95:161602. [PMID: 16241783 DOI: 10.1103/physrevlett.95.161602] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2005] [Indexed: 05/05/2023]
Abstract
We present the results of a search for the effects of large extra spatial dimensions in pp collisions at sqrt[s] = 1.96 TeV in events containing a pair of energetic muons. The data correspond to 246 pb(-1) of integrated luminosity collected by the D0 experiment at the Fermilab Tevatron Collider. Good agreement with the expected background was found, yielding no evidence for large extra dimensions. We set 95% C.L. lower limits on the fundamental Planck scale between 0.85 and 1.27 TeV within several formalisms. These are the most stringent limits achieved in the dimuon channel to date.
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Search for supersymmetry via associated production of charginos and neutralinos in final states with three leptons. PHYSICAL REVIEW LETTERS 2005; 95:151805. [PMID: 16241718 DOI: 10.1103/physrevlett.95.151805] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2005] [Indexed: 05/05/2023]
Abstract
A search for associated production of charginos and neutralinos is performed using data recorded with the D0 detector at a pp center-of-mass energy of 1.96 TeV at the Fermilab Tevatron Collider. This analysis considers final states with missing transverse energy and three charged leptons, of which at least two are electrons or muons. No evidence for supersymmetry is found in a data set corresponding to an integrated luminosity of 320 pb-1. Limits on the product of the production cross section and leptonic branching fraction are set. For the minimal supergravity model, a chargino lower mass limit of 117 GeV at the 95% C.L. is derived in regions of parameter space with enhanced leptonic branching fractions.
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Search for neutral supersymmetric Higgs Bosons in multijet events at sqrt[s]=1.96 TeV. PHYSICAL REVIEW LETTERS 2005; 95:151801. [PMID: 16241714 DOI: 10.1103/physrevlett.95.151801] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2005] [Indexed: 05/05/2023]
Abstract
We have performed a search for neutral Higgs bosons produced in association with bottom quarks in pp collisions, using 260 pb-1 of data collected with the D0 detector in Run II of the Fermilab Tevatron Collider. The cross sections for these processes are enhanced in many extensions of the standard model (SM), such as in its minimal supersymmetric extension at large tanbeta. The results of our analysis agree with expectations from the SM, and we use our measurements to set upper limits on the production of neutral Higgs bosons in the mass range of 90 to 150 GeV.
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Production of WZ events in pp collisions at square root(s) = 1.96 TeV and limits on anomalous WWZ couplings. PHYSICAL REVIEW LETTERS 2005; 95:141802. [PMID: 16241644 DOI: 10.1103/physrevlett.95.141802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2005] [Indexed: 05/05/2023]
Abstract
We present results from a search for WZ production with subsequent decay to l nu l' l' (l and l' = e or mu) using 0.30 fb(-1) of data collected by the D0 experiment between 2002 and 2004 at the Fermilab Tevatron. Three events with WZ decay characteristics are observed. With an estimated background of 0.71 +/- 0.08 events, we measure the WZ production cross section to be 4.5(-2.6)(+3.8) pb, with a 95% C.L. upper limit of 13.3 pb. The 95% C.L. limits for anomalous WWZ couplings are found to be -2.0 < delta kappaZ < 2.4 for form factor scale lambda = 1 TeV, and -0.48 < lambdaZ < 0.48 and -0.49 < delta g(1)(Z) < 0.66 for lambda = 1.5 TeV.
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Search for Randall-Sundrum gravitons in dilepton and diphoton final states. PHYSICAL REVIEW LETTERS 2005; 95:091801. [PMID: 16197208 DOI: 10.1103/physrevlett.95.091801] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2005] [Indexed: 05/04/2023]
Abstract
We report the first direct search for the Kaluza-Klein (KK) modes of Randall-Sundrum gravitons using dielectron, dimuon, and diphoton events observed with the D0 detector operating at the Fermilab Tevatron pp(-) Collider at sqrt[s]=1.96 TeV. No evidence for resonant production of gravitons has been found in the data corresponding to an integrated luminosity of approximately equal to 260 pb(-1). Lower limits on the mass of the first KK mode at the 95% C.L. have been set between 250 and 785 GeV, depending on its coupling to standard model particles.
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