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  • 1
    Publication Date: 2015-04-10
    Description: We present new observations of the Kuiper belt analogues around HD 38858 and HD 20794, hosts of super-Earth mass planets within 1 au. As two of the four nearby G-type stars (with HD 69830 and 61 Vir) that form the basis of a possible correlation between low-mass planets and debris disc brightness, these systems are of particular interest. The disc around HD 38858 is well resolved with Herschel and we constrain the disc geometry and radial structure. We also present a probable James Clerk Maxwell Telescope sub-mm continuum detection of the disc and a CO J  = 2–1 upper limit. The disc around HD 20794 is much fainter and appears marginally resolved with Herschel , and is constrained to be less extended than the discs around 61 Vir and HD 38858. We also set limits on the radial location of hot dust recently detected around HD 20794 with near-IR interferometry. We present High Accuracy Radial velocity Planet Searcher upper limits on unseen planets in these four systems, ruling out additional super-Earths within a few au, and Saturn-mass planets within 10 au. We consider the disc structure in the three systems with Kuiper belt analogues (HD 69830 has only a warm dust detection), concluding that 61 Vir and HD 38858 have greater radial disc extent than HD 20794. We speculate that the greater width is related to the greater minimum planet masses (10–20 M versus 3–5 M ), arising from an eccentric planetesimal population analogous to the Solar system's scattered disc. We discuss alternative scenarios and possible means to distinguish among them.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
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  • 2
    Publication Date: 2012-02-24
    Description: Energy & Fuels DOI: 10.1021/ef201925c
    Print ISSN: 0887-0624
    Electronic ISSN: 1520-5029
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Process Engineering, Biotechnology, Nutrition Technology
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  • 3
    Publication Date: 2011-02-09
    Description: Intraspecific hybrids between the Arabidopsis thaliana accessions C24 and Landsberg erecta have strong heterosis. The reciprocal hybrids show a decreased level of 24-nt small RNA (sRNA) relative to the parents with the decrease greatest for those loci where the parents had markedly different 24-nt sRNA levels. The genomic regions with reduced 24-nt sRNA levels were largely associated with genes and their flanking regions indicating a potential effect on gene expression. We identified several examples of genes with altered 24-nt sRNA levels that showed correlated changes in DNA methylation and expression levels. We suggest that such epigenetically generated differences in gene activity may contribute to hybrid vigor and that the epigenetic diversity between ecotypes provides increased allelic (epi-allelic) variability that could contribute to heterosis.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 4
    Publication Date: 2014-09-20
    Description: Molecular gas constitutes the dominant mass component of protoplanetary discs. To date, these sources have not been studied comprehensively at the longest far-infrared and shortest submillimetre wavelengths. This paper presents Herschel SPIRE FTS spectroscopic observations towards 18 protoplanetary discs, covering the entire 450–1540 GHz (666–195 μm) range at / 400–1300. The spectra reveal clear detections of the dust continuum and, in six targets, a significant amount of spectral line emission primarily attributable to 12 CO rotational lines. Other targets exhibit little to no detectable spectral lines. Low signal-to-noise detections also include signatures from 13 CO, [C i ] and HCN. For completeness, we present upper limits of non-detected lines in all targets, including low-energy transitions of H 2 O and CH + molecules. The 10 12 CO lines that fall within the SPIRE FTS bands trace energy levels of ~50–500 K. Combined with lower and higher energy lines from the literature, we compare the CO rotational line energy distribution with detailed physical–chemical models, for sources where these are available and published. Our 13 CO line detections in the disc around Herbig Be star HD 100546 exceed, by factors of ~10–30, the values predicted by a model that matches a wealth of other observational constraints, including the SPIRE 12 CO ladder. To explain the observed 12 CO/ 13 CO ratio, it may be necessary to consider the combined effects of optical depth and isotope selective (photo)chemical processes. Considering the full sample of 18 objects, we find that the strongest line emission is observed in discs around Herbig Ae/Be stars, although not all show line emission. In addition, two of the six T Tauri objects exhibit detectable 12 CO lines in the SPIRE range.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
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  • 5
    Publication Date: 2012-08-11
    Description: Earth's climate underwent a fundamental change between 1250 and 700 thousand years ago, the mid-Pleistocene transition (MPT), when the dominant periodicity of climate cycles changed from 41 thousand to 100 thousand years in the absence of substantial change in orbital forcing. Over this time, an increase occurred in the amplitude of change of deep-ocean foraminiferal oxygen isotopic ratios, traditionally interpreted as defining the main rhythm of ice ages although containing large effects of changes in deep-ocean temperature. We have separated the effects of decreasing temperature and increasing global ice volume on oxygen isotope ratios. Our results suggest that the MPT was initiated by an abrupt increase in Antarctic ice volume 900 thousand years ago. We see no evidence of a pattern of gradual cooling, but near-freezing temperatures occur at every glacial maximum.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Elderfield, H -- Ferretti, P -- Greaves, M -- Crowhurst, S -- McCave, I N -- Hodell, D -- Piotrowski, A M -- New York, N.Y. -- Science. 2012 Aug 10;337(6095):704-9. doi: 10.1126/science.1221294.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK. he101@cam.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22879512" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
    Publication Date: 2014-10-11
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gil, Yolanda -- Greaves, Mark -- Hendler, James -- Hirsh, Haym -- New York, N.Y. -- Science. 2014 Oct 10;346(6206):171-2. doi: 10.1126/science.1259439.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Information Sciences Institute, University of Southern California, Marina del Rey, CA 90292, USA. ; Pacific Northwest National Laboratory, Richland, WA 99354, USA. ; Information Technology and Web Science, Rensselaer Polytechnic Institute, Troy, NY 12203, USA. hendler@cs.rpi.edu. ; Cornell University, Ithaca, NY 14850, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25301606" target="_blank"〉PubMed〈/a〉
    Keywords: *Artificial Intelligence ; Humans ; *Research Design ; Statistics as Topic
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 7
    Publication Date: 2014-02-14
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Potter, Nicola E -- Greaves, Mel -- England -- Nature. 2014 Feb 20;506(7488):300-1. doi: 10.1038/nature13056. Epub 2014 Feb 12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre for Evolution and Cancer, The Institute of Cancer Research, London SM2 5NG, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24522525" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Female ; Hematopoietic Stem Cells/*cytology ; Humans ; Leukemia, Myeloid, Acute/*pathology ; Neoplastic Stem Cells/*cytology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 8
    Publication Date: 2010-12-17
    Description: Little is known of the genetic architecture of cancer at the subclonal and single-cell level or in the cells responsible for cancer clone maintenance and propagation. Here we have examined this issue in childhood acute lymphoblastic leukaemia in which the ETV6-RUNX1 gene fusion is an early or initiating genetic lesion followed by a modest number of recurrent or 'driver' copy number alterations. By multiplexing fluorescence in situ hybridization probes for these mutations, up to eight genetic abnormalities can be detected in single cells, a genetic signature of subclones identified and a composite picture of subclonal architecture and putative ancestral trees assembled. Subclones in acute lymphoblastic leukaemia have variegated genetics and complex, nonlinear or branching evolutionary histories. Copy number alterations are independently and reiteratively acquired in subclones of individual patients, and in no preferential order. Clonal architecture is dynamic and is subject to change in the lead-up to a diagnosis and in relapse. Leukaemia propagating cells, assayed by serial transplantation in NOD/SCID IL2Rgamma(null) mice, are also genetically variegated, mirroring subclonal patterns, and vary in competitive regenerative capacity in vivo. These data have implications for cancer genomics and for the targeted therapy of cancer.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Anderson, Kristina -- Lutz, Christoph -- van Delft, Frederik W -- Bateman, Caroline M -- Guo, Yanping -- Colman, Susan M -- Kempski, Helena -- Moorman, Anthony V -- Titley, Ian -- Swansbury, John -- Kearney, Lyndal -- Enver, Tariq -- Greaves, Mel -- MC_U137973817/Medical Research Council/United Kingdom -- England -- Nature. 2011 Jan 20;469(7330):356-61. doi: 10.1038/nature09650. Epub 2010 Dec 15.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Section of Haemato-Oncology, The Institute of Cancer Research, Sutton SM2 5NG, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21160474" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Clone Cells/metabolism/*pathology ; Core Binding Factor Alpha 2 Subunit ; DNA Copy Number Variations/genetics ; DNA Mutational Analysis ; Disease Progression ; Genetic Variation/*genetics ; Genotype ; Humans ; Immunophenotyping ; In Situ Hybridization, Fluorescence ; Interleukin Receptor Common gamma Subunit/deficiency/genetics ; Mice ; Mice, Inbred NOD ; Mice, SCID ; Neoplasm Transplantation ; Oncogene Proteins, Fusion/genetics ; Precursor Cell Lymphoblastic Leukemia-Lymphoma/*genetics/*pathology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 9
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    Nature Publishing Group (NPG)
    Publication Date: 2012-01-20
    Description: Cancers evolve by a reiterative process of clonal expansion, genetic diversification and clonal selection within the adaptive landscapes of tissue ecosystems. The dynamics are complex, with highly variable patterns of genetic diversity and resulting clonal architecture. Therapeutic intervention may destroy cancer clones and erode their habitats, but it can also inadvertently provide a potent selective pressure for the expansion of resistant variants. The inherently Darwinian character of cancer is the primary reason for this therapeutic failure, but it may also hold the key to more effective control.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3367003/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3367003/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Greaves, Mel -- Maley, Carlo C -- P01 CA091955/CA/NCI NIH HHS/ -- P01 CA91955/CA/NCI NIH HHS/ -- R01 CA140657/CA/NCI NIH HHS/ -- R01 CA149566/CA/NCI NIH HHS/ -- U54 CA143803/CA/NCI NIH HHS/ -- England -- Nature. 2012 Jan 18;481(7381):306-13. doi: 10.1038/nature10762.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Molecular Pathology, The Institute of Cancer Research, Brookes Lawley Building, 15 Cotswold Road, Sutton, Surrey SM2 5NG, UK. mel.greaves@icr.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22258609" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Clonal Evolution ; Clone Cells/metabolism/pathology ; Genomics ; Humans ; Mutation ; Neoplasms/*genetics/*pathology ; Neoplastic Stem Cells/metabolism/pathology ; Tumor Microenvironment
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 10
    Publication Date: 2013-08-16
    Description: All cancers are caused by somatic mutations; however, understanding of the biological processes generating these mutations is limited. The catalogue of somatic mutations from a cancer genome bears the signatures of the mutational processes that have been operative. Here we analysed 4,938,362 mutations from 7,042 cancers and extracted more than 20 distinct mutational signatures. Some are present in many cancer types, notably a signature attributed to the APOBEC family of cytidine deaminases, whereas others are confined to a single cancer class. Certain signatures are associated with age of the patient at cancer diagnosis, known mutagenic exposures or defects in DNA maintenance, but many are of cryptic origin. In addition to these genome-wide mutational signatures, hypermutation localized to small genomic regions, 'kataegis', is found in many cancer types. The results reveal the diversity of mutational processes underlying the development of cancer, with potential implications for understanding of cancer aetiology, prevention and therapy.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3776390/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3776390/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Alexandrov, Ludmil B -- Nik-Zainal, Serena -- Wedge, David C -- Aparicio, Samuel A J R -- Behjati, Sam -- Biankin, Andrew V -- Bignell, Graham R -- Bolli, Niccolo -- Borg, Ake -- Borresen-Dale, Anne-Lise -- Boyault, Sandrine -- Burkhardt, Birgit -- Butler, Adam P -- Caldas, Carlos -- Davies, Helen R -- Desmedt, Christine -- Eils, Roland -- Eyfjord, Jorunn Erla -- Foekens, John A -- Greaves, Mel -- Hosoda, Fumie -- Hutter, Barbara -- Ilicic, Tomislav -- Imbeaud, Sandrine -- Imielinski, Marcin -- Jager, Natalie -- Jones, David T W -- Jones, David -- Knappskog, Stian -- Kool, Marcel -- Lakhani, Sunil R -- Lopez-Otin, Carlos -- Martin, Sancha -- Munshi, Nikhil C -- Nakamura, Hiromi -- Northcott, Paul A -- Pajic, Marina -- Papaemmanuil, Elli -- Paradiso, Angelo -- Pearson, John V -- Puente, Xose S -- Raine, Keiran -- Ramakrishna, Manasa -- Richardson, Andrea L -- Richter, Julia -- Rosenstiel, Philip -- Schlesner, Matthias -- Schumacher, Ton N -- Span, Paul N -- Teague, Jon W -- Totoki, Yasushi -- Tutt, Andrew N J -- Valdes-Mas, Rafael -- van Buuren, Marit M -- van 't Veer, Laura -- Vincent-Salomon, Anne -- Waddell, Nicola -- Yates, Lucy R -- Australian Pancreatic Cancer Genome Initiative -- ICGC Breast Cancer Consortium -- ICGC MMML-Seq Consortium -- ICGC PedBrain -- Zucman-Rossi, Jessica -- Futreal, P Andrew -- McDermott, Ultan -- Lichter, Peter -- Meyerson, Matthew -- Grimmond, Sean M -- Siebert, Reiner -- Campo, Elias -- Shibata, Tatsuhiro -- Pfister, Stefan M -- Campbell, Peter J -- Stratton, Michael R -- 088340/Wellcome Trust/United Kingdom -- 093867/Wellcome Trust/United Kingdom -- 098051/Wellcome Trust/United Kingdom -- T32 CA009216/CA/NCI NIH HHS/ -- England -- Nature. 2013 Aug 22;500(7463):415-21. doi: 10.1038/nature12477. Epub 2013 Aug 14.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cancer Genome Project, Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridgeshire CB10 1SA, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23945592" target="_blank"〉PubMed〈/a〉
    Keywords: Aging/genetics ; Algorithms ; Cell Transformation, Neoplastic/*genetics/pathology ; Cytidine Deaminase/genetics ; DNA/genetics/metabolism ; DNA Mutational Analysis ; Humans ; Models, Genetic ; Mutagenesis/*genetics ; Mutagenesis, Insertional/genetics ; Mutagens/pharmacology ; Mutation/*genetics ; Neoplasms/enzymology/*genetics/pathology ; Organ Specificity ; Reproducibility of Results ; Sequence Deletion/genetics ; Transcription, Genetic/genetics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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