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  • 1
    Publikationsdatum: 2000-03-24
    Beschreibung: A comparative analysis of the genomes of Drosophila melanogaster, Caenorhabditis elegans, and Saccharomyces cerevisiae-and the proteins they are predicted to encode-was undertaken in the context of cellular, developmental, and evolutionary processes. The nonredundant protein sets of flies and worms are similar in size and are only twice that of yeast, but different gene families are expanded in each genome, and the multidomain proteins and signaling pathways of the fly and worm are far more complex than those of yeast. The fly has orthologs to 177 of the 289 human disease genes examined and provides the foundation for rapid analysis of some of the basic processes involved in human disease.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2754258/" 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/PMC2754258/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rubin, G M -- Yandell, M D -- Wortman, J R -- Gabor Miklos, G L -- Nelson, C R -- Hariharan, I K -- Fortini, M E -- Li, P W -- Apweiler, R -- Fleischmann, W -- Cherry, J M -- Henikoff, S -- Skupski, M P -- Misra, S -- Ashburner, M -- Birney, E -- Boguski, M S -- Brody, T -- Brokstein, P -- Celniker, S E -- Chervitz, S A -- Coates, D -- Cravchik, A -- Gabrielian, A -- Galle, R F -- Gelbart, W M -- George, R A -- Goldstein, L S -- Gong, F -- Guan, P -- Harris, N L -- Hay, B A -- Hoskins, R A -- Li, J -- Li, Z -- Hynes, R O -- Jones, S J -- Kuehl, P M -- Lemaitre, B -- Littleton, J T -- Morrison, D K -- Mungall, C -- O'Farrell, P H -- Pickeral, O K -- Shue, C -- Vosshall, L B -- Zhang, J -- Zhao, Q -- Zheng, X H -- Lewis, S -- P4IHG00739/HG/NHGRI NIH HHS/ -- P50HG00750/HG/NHGRI NIH HHS/ -- R01 GM037193/GM/NIGMS NIH HHS/ -- R01 GM037193-14/GM/NIGMS NIH HHS/ -- R01 GM037193-15/GM/NIGMS NIH HHS/ -- R01 GM060988/GM/NIGMS NIH HHS/ -- R01 GM060988-01/GM/NIGMS NIH HHS/ -- R01 NS040296/NS/NINDS NIH HHS/ -- R01 NS040296-01/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2000 Mar 24;287(5461):2204-15.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Molecular and Cell Biology, Berkeley Drosophila Genome Project, University of California, Berkeley, CA 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10731134" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Apoptosis/genetics ; Biological Evolution ; Caenorhabditis elegans/chemistry/*genetics/physiology ; Cell Adhesion/genetics ; Cell Cycle/genetics ; Drosophila melanogaster/chemistry/*genetics/physiology ; Fungal Proteins/chemistry/genetics ; Genes, Duplicate ; Genetic Diseases, Inborn/genetics ; Genetics, Medical ; *Genome ; Helminth Proteins/chemistry/genetics ; Humans ; Immunity/genetics ; Insect Proteins/chemistry/genetics ; Multigene Family ; Neoplasms/genetics ; Protein Structure, Tertiary ; *Proteome ; Saccharomyces cerevisiae/chemistry/*genetics/physiology ; Signal Transduction/genetics
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    Unbekannt
    Nature Publishing Group (NPG)
    Publikationsdatum: 2009-03-28
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Coates, Michael I -- England -- Nature. 2009 Mar 26;458(7237):413-4. doi: 10.1038/458413a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19325614" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; China ; Fishes/*anatomy & histology/classification ; *Fossils ; *Phylogeny
    Print ISSN: 0028-0836
    Digitale ISSN: 1476-4687
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Publikationsdatum: 2009-12-18
    Beschreibung: DNA double-strand breaks (DSBs) are highly cytotoxic lesions that are generated by ionizing radiation and various DNA-damaging chemicals. Following DSB formation, cells activate the DNA-damage response (DDR) protein kinases ATM, ATR and DNA-PK (also known as PRKDC). These then trigger histone H2AX (also known as H2AFX) phosphorylation and the accumulation of proteins such as MDC1, 53BP1 (also known as TP53BP1), BRCA1, CtIP (also known as RBBP8), RNF8 and RNF168/RIDDLIN into ionizing radiation-induced foci (IRIF) that amplify DSB signalling and promote DSB repair. Attachment of small ubiquitin-related modifier (SUMO) to target proteins controls diverse cellular functions. Here, we show that SUMO1, SUMO2 and SUMO3 accumulate at DSB sites in mammalian cells, with SUMO1 and SUMO2/3 accrual requiring the E3 ligase enzymes PIAS4 and PIAS1. We also establish that PIAS1 and PIAS4 are recruited to damage sites via mechanisms requiring their SAP domains, and are needed for the productive association of 53BP1, BRCA1 and RNF168 with such regions. Furthermore, we show that PIAS1 and PIAS4 promote DSB repair and confer ionizing radiation resistance. Finally, we establish that PIAS1 and PIAS4 are required for effective ubiquitin-adduct formation mediated by RNF8, RNF168 and BRCA1 at sites of DNA damage. These findings thus identify PIAS1 and PIAS4 as components of the DDR and reveal how protein recruitment to DSB sites is controlled by coordinated SUMOylation and ubiquitylation.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2904806/" 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/PMC2904806/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Galanty, Yaron -- Belotserkovskaya, Rimma -- Coates, Julia -- Polo, Sophie -- Miller, Kyle M -- Jackson, Stephen P -- 086861/Wellcome Trust/United Kingdom -- 11224/Cancer Research UK/United Kingdom -- A5290/Cancer Research UK/United Kingdom -- Cancer Research UK/United Kingdom -- England -- Nature. 2009 Dec 17;462(7275):935-9. doi: 10.1038/nature08657.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Wellcome Trust and Cancer Research UK Gurdon Institute, and Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge CB2 1QN, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20016603" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; BRCA1 Protein/metabolism ; Cell Line ; Cell Line, Tumor ; *DNA Breaks, Double-Stranded ; *DNA Repair ; DNA-Binding Proteins/genetics/metabolism ; Fluorescence Recovery After Photobleaching ; Humans ; Intracellular Signaling Peptides and Proteins/genetics/metabolism ; Models, Biological ; Phosphorylation ; Protein Inhibitors of Activated STAT/chemistry/genetics/*metabolism ; Protein Structure, Tertiary ; Replication Protein A/metabolism ; Small Ubiquitin-Related Modifier Proteins/genetics/*metabolism ; Ubiquitin-Conjugating Enzymes/genetics/metabolism ; Ubiquitin-Protein Ligases/metabolism ; Ubiquitination
    Print ISSN: 0028-0836
    Digitale ISSN: 1476-4687
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 2004-04-06
    Beschreibung: A tetrapod humerus from the Late Devonian of Pennsylvania has a novel mix of primitive and derived characters. A comparative analysis of this fossil and other relevant humeri from the Devonian shows that the role of the limb in propping the body arose first in fish fins, not tetrapod limbs. The functional diversity of the earliest known limbs includes several different kinds of appendage design. This functional diversity was achieved with a humeral architecture that was remarkably conserved during the Devonian.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shubin, Neil H -- Daeschler, Edward B -- Coates, Michael I -- New York, N.Y. -- Science. 2004 Apr 2;304(5667):90-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Organismal Biology and Anatomy, University of Chicago, Chicago, IL 60637, USA. nshubin@uchicago.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15064415" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Biological Evolution ; Biomechanical Phenomena ; Extremities/*anatomy & histology ; Fishes/anatomy & histology/physiology ; *Fossils ; Humerus/*anatomy & histology ; Locomotion ; Movement ; Pennsylvania ; Vertebrates/*anatomy & histology/physiology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Publikationsdatum: 2012-07-27
    Beschreibung: The rapid disruption of tropical forests probably imperils global biodiversity more than any other contemporary phenomenon. With deforestation advancing quickly, protected areas are increasingly becoming final refuges for threatened species and natural ecosystem processes. However, many protected areas in the tropics are themselves vulnerable to human encroachment and other environmental stresses. As pressures mount, it is vital to know whether existing reserves can sustain their biodiversity. A critical constraint in addressing this question has been that data describing a broad array of biodiversity groups have been unavailable for a sufficiently large and representative sample of reserves. Here we present a uniquely comprehensive data set on changes over the past 20 to 30 years in 31 functional groups of species and 21 potential drivers of environmental change, for 60 protected areas stratified across the world's major tropical regions. Our analysis reveals great variation in reserve 'health': about half of all reserves have been effective or performed passably, but the rest are experiencing an erosion of biodiversity that is often alarmingly widespread taxonomically and functionally. Habitat disruption, hunting and forest-product exploitation were the strongest predictors of declining reserve health. Crucially, environmental changes immediately outside reserves seemed nearly as important as those inside in determining their ecological fate, with changes inside reserves strongly mirroring those occurring around them. These findings suggest that tropical protected areas are often intimately linked ecologically to their surrounding habitats, and that a failure to stem broad-scale loss and degradation of such habitats could sharply increase the likelihood of serious biodiversity declines.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Laurance, William F -- Useche, D Carolina -- Rendeiro, Julio -- Kalka, Margareta -- Bradshaw, Corey J A -- Sloan, Sean P -- Laurance, Susan G -- Campbell, Mason -- Abernethy, Kate -- Alvarez, Patricia -- Arroyo-Rodriguez, Victor -- Ashton, Peter -- Benitez-Malvido, Julieta -- Blom, Allard -- Bobo, Kadiri S -- Cannon, Charles H -- Cao, Min -- Carroll, Richard -- Chapman, Colin -- Coates, Rosamond -- Cords, Marina -- Danielsen, Finn -- De Dijn, Bart -- Dinerstein, Eric -- Donnelly, Maureen A -- Edwards, David -- Edwards, Felicity -- Farwig, Nina -- Fashing, Peter -- Forget, Pierre-Michel -- Foster, Mercedes -- Gale, George -- Harris, David -- Harrison, Rhett -- Hart, John -- Karpanty, Sarah -- Kress, W John -- Krishnaswamy, Jagdish -- Logsdon, Willis -- Lovett, Jon -- Magnusson, William -- Maisels, Fiona -- Marshall, Andrew R -- McClearn, Deedra -- Mudappa, Divya -- Nielsen, Martin R -- Pearson, Richard -- Pitman, Nigel -- van der Ploeg, Jan -- Plumptre, Andrew -- Poulsen, John -- Quesada, Mauricio -- Rainey, Hugo -- Robinson, Douglas -- Roetgers, Christiane -- Rovero, Francesco -- Scatena, Frederick -- Schulze, Christian -- Sheil, Douglas -- Struhsaker, Thomas -- Terborgh, John -- Thomas, Duncan -- Timm, Robert -- Urbina-Cardona, J Nicolas -- Vasudevan, Karthikeyan -- Wright, S Joseph -- Arias-G, Juan Carlos -- Arroyo, Luzmila -- Ashton, Mark -- Auzel, Philippe -- Babaasa, Dennis -- Babweteera, Fred -- Baker, Patrick -- Banki, Olaf -- Bass, Margot -- Bila-Isia, Inogwabini -- Blake, Stephen -- Brockelman, Warren -- Brokaw, Nicholas -- Bruhl, Carsten A -- Bunyavejchewin, Sarayudh -- Chao, Jung-Tai -- Chave, Jerome -- Chellam, Ravi -- Clark, Connie J -- Clavijo, Jose -- Congdon, Robert -- Corlett, Richard -- Dattaraja, H S -- Dave, Chittaranjan -- Davies, Glyn -- Beisiegel, Beatriz de Mello -- da Silva, Rosa de Nazare Paes -- Di Fiore, Anthony -- Diesmos, Arvin -- Dirzo, Rodolfo -- Doran-Sheehy, Diane -- Eaton, Mitchell -- Emmons, Louise -- Estrada, Alejandro -- Ewango, Corneille -- Fedigan, Linda -- Feer, Francois -- Fruth, Barbara -- Willis, Jacalyn Giacalone -- Goodale, Uromi -- Goodman, Steven -- Guix, Juan C -- Guthiga, Paul -- Haber, William -- Hamer, Keith -- Herbinger, Ilka -- Hill, Jane -- Huang, Zhongliang -- Sun, I Fang -- Ickes, Kalan -- Itoh, Akira -- Ivanauskas, Natalia -- Jackes, Betsy -- Janovec, John -- Janzen, Daniel -- Jiangming, Mo -- Jin, Chen -- Jones, Trevor -- Justiniano, Hermes -- Kalko, Elisabeth -- Kasangaki, Aventino -- Killeen, Timothy -- King, Hen-biau -- Klop, Erik -- Knott, Cheryl -- Kone, Inza -- Kudavidanage, Enoka -- Ribeiro, Jose Lahoz da Silva -- Lattke, John -- Laval, Richard -- Lawton, Robert -- Leal, Miguel -- Leighton, Mark -- Lentino, Miguel -- Leonel, Cristiane -- Lindsell, Jeremy -- Ling-Ling, Lee -- Linsenmair, K Eduard -- Losos, Elizabeth -- Lugo, Ariel -- Lwanga, Jeremiah -- Mack, Andrew L -- Martins, Marlucia -- McGraw, W Scott -- McNab, Roan -- Montag, Luciano -- Thompson, Jo Myers -- Nabe-Nielsen, Jacob -- Nakagawa, Michiko -- Nepal, Sanjay -- Norconk, Marilyn -- Novotny, Vojtech -- O'Donnell, Sean -- Opiang, Muse -- Ouboter, Paul -- Parker, Kenneth -- Parthasarathy, N -- Pisciotta, Katia -- Prawiradilaga, Dewi -- Pringle, Catherine -- Rajathurai, Subaraj -- Reichard, Ulrich -- Reinartz, Gay -- Renton, Katherine -- Reynolds, Glen -- Reynolds, Vernon -- Riley, Erin -- Rodel, Mark-Oliver -- Rothman, Jessica -- Round, Philip -- Sakai, Shoko -- Sanaiotti, Tania -- Savini, Tommaso -- Schaab, Gertrud -- Seidensticker, John -- Siaka, Alhaji -- Silman, Miles R -- Smith, Thomas B -- de Almeida, Samuel Soares -- Sodhi, Navjot -- Stanford, Craig -- Stewart, Kristine -- Stokes, Emma -- Stoner, Kathryn E -- Sukumar, Raman -- Surbeck, Martin -- Tobler, Mathias -- Tscharntke, Teja -- Turkalo, Andrea -- Umapathy, Govindaswamy -- van Weerd, Merlijn -- Rivera, Jorge Vega -- Venkataraman, Meena -- Venn, Linda -- Verea, Carlos -- de Castilho, Carolina Volkmer -- Waltert, Matthias -- Wang, Benjamin -- Watts, David -- Weber, William -- West, Paige -- Whitacre, David -- Whitney, Ken -- Wilkie, David -- Williams, Stephen -- Wright, Debra D -- Wright, Patricia -- Xiankai, Lu -- Yonzon, Pralad -- Zamzani, Franky -- England -- Nature. 2012 Sep 13;489(7415):290-4. doi: 10.1038/nature11318.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre for Tropical Environmental and Sustainability Science and School of Marine and Tropical Biology, James Cook University, Cairns, Queensland 4878, Australia. bill.laurance@jcu.edu.au〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22832582" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Agriculture/statistics & numerical data ; Animals ; *Biodiversity ; Conservation of Natural Resources/*statistics & numerical data ; Data Collection ; Ecology/statistics & numerical data ; Endangered Species/*statistics & numerical data ; Environmental Pollution/adverse effects/statistics & numerical data ; Fires/statistics & numerical data ; Forestry/statistics & numerical data ; Interviews as Topic ; Mining/statistics & numerical data ; Population Growth ; Rain ; Reproducibility of Results ; Research Personnel ; Surveys and Questionnaires ; Temperature ; Trees/*physiology ; *Tropical Climate
    Print ISSN: 0028-0836
    Digitale ISSN: 1476-4687
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Publikationsdatum: 2012-06-16
    Beschreibung: Acanthodians, an exclusively Palaeozoic group of fish, are central to a renewed debate on the origin of modern gnathostomes: jawed vertebrates comprising Chondrichthyes (sharks, rays and ratfish) and Osteichthyes (bony fishes and tetrapods). Acanthodian internal anatomy is primarily understood from Acanthodes bronni because it remains the only example preserved in substantial detail, central to which is an ostensibly osteichthyan braincase. For this reason, Acanthodes has become an indispensible component in early gnathostome phylogenies. Here we present a new description of the Acanthodes braincase, yielding new details of external and internal morphology, notably the regions surrounding and within the ear capsule and neurocranial roof. These data contribute to a new reconstruction that, unexpectedly, resembles early chondrichthyan crania. Principal coordinates analysis of a character-taxon matrix including these new data confirms this impression: Acanthodes is quantifiably closer to chondrichthyans than to osteichthyans. However, phylogenetic analysis places Acanthodes on the osteichthyan stem, as part of a well-resolved tree that also recovers acanthodians as stem chondrichthyans and stem gnathostomes. As such, perceived chondrichthyan features of the Acanthodes cranium represent shared primitive conditions for crown group gnathostomes. Moreover, this increasingly detailed picture of early gnathostome evolution highlights ongoing and profound anatomical reorganization of vertebrate crania after the origin of jaws but before the divergence of living clades.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davis, Samuel P -- Finarelli, John A -- Coates, Michael I -- England -- Nature. 2012 Jun 13;486(7402):247-50. doi: 10.1038/nature11080.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉UCD School of Biology and Environmental Science, University College Dublin, Belfield, Dublin 4, Ireland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22699617" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Fishes/*anatomy & histology/*classification ; *Fossils ; Phylogeny ; Principal Component Analysis ; Sharks/anatomy & histology/classification ; Skull/*anatomy & histology
    Print ISSN: 0028-0836
    Digitale ISSN: 1476-4687
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
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    Unbekannt
    American Association for the Advancement of Science (AAAS)
    Publikationsdatum: 1983-06-10
    Beschreibung: Hybridization between two chromosomally distinct subspecies of the grasshopper Caledia captiva results in a high incidence of novel chromosomal rearrangements among the backcross progeny. Rearrangements are restricted to those chromosomes derived from the F1 hybrid parent. Chromosomal involvement is nonrandom with the same rearrangement occurring repeatedly in different backcrosses. A single individual can also generate an array of different rearrangements among its offspring. Several of the rearrangements have also been found in natural populations. The nonrandom and recurrent nature of these chromosomal mutations at high frequencies provides a plausible explanation for the establishment and fixation of chromosomal rearrangements in natural populations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shaw, D D -- Wilkinson, P -- Coates, D J -- New York, N.Y. -- Science. 1983 Jun 10;220(4602):1165-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6407107" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Biological Evolution ; Chromosomes/*physiology ; Drosophila melanogaster ; Female ; Genetic Variation ; Grasshoppers/*genetics ; *Hybridization, Genetic ; Male ; *Mutation
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Publikationsdatum: 2019-07-19
    Beschreibung: With the recent discovery of heavy ions, positive and negative, by the Cassini Plasma Spectrometer (CAPS) instrument in Titan's ionosphere, it reveals new possibilities for aerosol formation at Titan and the introduction of free oxygen to the aerosol chemistry from Saturn's magnetosphere with Enceladus as the primary oxygen source. One can estimate whether the heavy ions in the ionosphere are of sufficient number to account for all the aerosols, under what conditions are favorable for heavy ion formation and how they are introduced as seed particles deeper in Titan's atmosphere where the aerosols form and eventually find themselves on Titan's surface where unknown chemical processes can take place. Finally, what are the possibilities with regard to their chemistry on the surface with some free oxygen present in their seed particles?
    Schlagwort(e): Astrophysics
    Materialart: International Space Science Institute Conference; Aug 27, 2007 - Aug 31, 2007; Bern; Switzerland
    Format: text
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  • 9
    Publikationsdatum: 2019-07-12
    Beschreibung: Planetary plasma and magnetic field environments can be studied in two complementary ways - by in situ measurements, or by remote sensing. While the former provide precise information about plasma behaviour, instabilities and dynamics on local scales, the latter offers the global view necessary to understand the overall interaction of the magnetospheric plasma with the solar wind. Some parts of the Earth's magnetosphere have been remotely sensed, but the majority remains unexplored by this type of measurements. Here we propose a novel and more elegant approach employing remote X-ray imaging techniques. which are now possible thanks to the relatively recent discovery of solar wind charge exchange X-ray emissions in the vicinity of the Earth's magnetosphere. In this article we describe how an appropriately designed and located. X-ray telescope, supported by simultaneous in situ measurements of the solar wind, can be used to image the dayside magnetosphere, magnetosheath and bow shock. with a temporal and spatial resolution sufficient to address several key outstanding questions concerning how the solar wind interacts with the Earth's magnetosphere on a global level. Global images of the dayside magnetospheric boundaries require vantage points well outside the magnetosphere. Our studies have led us to propose 'AXIOM: Advanced X-ray Imaging Of the Magnetosphere', a concept mission using a Vega launcher with a LISA Pathfinder-type Propulsion Module to place the spacecraft in a Lissajous orbit around the Earth - Moon Ll point. The model payload consists of an X-ray Wide Field Imager, capable of both imaging and spectroscopy, and an in situ plasma and magnetic field measurement package. This package comprises a Proton-Alpha Sensor, designed to measure the bulk properties of the solar wind, an Ion Composition Analyser, to characterize the minor ion populations in the solar wind that cause charge exchange emission, and a Magnetometer, designed to measure the strength and direction of the solar wind magnetic field. We also show simulations that demonstrate how the proposed X-ray telescope design is capable of imaging the predicted emission from the dayside magnetosphere with the sensitivity and cadence required to achieve the science goals of the mission.
    Schlagwort(e): Astrophysics
    Materialart: GSFC.7305.2012
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Publikationsdatum: 2019-07-12
    Beschreibung: We present the first observation of magnetic fluctuations consistent with Short Large-Amplitude Magnetic Structures (SLAMS) in the foreshock of the planet Venus. Three monolithic magnetic field spikes were observed by the Venus Express on the 11th of April 2009. The structures were approx.1.5-〉11s in duration, had magnetic compression ratios between approx.3-〉6, and exhibited elliptical polarization. These characteristics are consistent with the SLAMS observed at Earth, Jupiter, and Comet Giacobini-Zinner, and thus we hypothesize that it is possible SLAMS may be found at any celestial body with a foreshock.
    Schlagwort(e): Astrophysics
    Materialart: GSFC.JA.7467.2012
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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