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  • 1
    Electronic Resource
    Electronic Resource
    The fine structure of motile cells in the generaUlvaria andMonostroma, with special reference to the taxonomic position ofMonostroma oxyspermum (Ulvophyceae, Chlorophyta) (1984)
    Springer
    Plant systematics and evolution 144 (1984), S. 179-199 
    Details
    ISSN: 1615-6110
    Keywords: Chlorophyta ; Gayralia ; Monostroma ; M. bullosum ; M. grevillei ; M. oxyspermum ; Ulvaria ; U. obscura var.blyttii ; Ulvophyceae ; Flagellar apparatus absolute orientation ; mating structure ; terminal cap ; proximal sheath
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The zoospores and isogametes ofUlvaria obscura var.blyttii, the isogametes ofMonostroma bullosum, and the anisogametes ofM. grevillei have a flagellar apparatus with counterclockwise absolute orientation and terminal caps, and therefore belong to theUlvophyceae. On the basis of the absence or presence of body scales and the morphologies of certain flagellar apparatus components,Ulvaria obscura var.blyttii is retained in theUlvales, whileM. bullosum, M. grevillei andM. oxyspermum are referred to theUlotrichales. Differences in scale morphology, certain flagellar apparatus components, and early thallus ontogeny support the transfer ofM. oxyspermum to the genusGayralia. Mating structures and their positional relationships within the cell are described from the gametes examined. A plasmalemma-associated plaque that may be a degenerate mating structure occurs in someG. oxysperma motile cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984132
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    Paper (German National Licenses)
    Fulltext
  • 2
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    An Update on the CDDIS (2012)
    In:  CASI
    Details
    Publication Date: 2019-07-19
    Description: The Crustal Dynamics Data Inforn1ation System (CoorS) supports data archiving and distribution activities for the space geodesy and geodynamics community. The main objectives of the system are to store space geodesy and geodynamics related data products in a central data bank, to maintain infom1ation about the archival of these data, and to disseminate these data and information in a timely mam1er to a global scientific research community. The archive consists of GNSS, laser ranging, VLBI, and OORIS data sets and products derived from these data. The coors is one of NASA's Earth Observing System Oata and Infom1ation System (EOSorS) distributed data centers; EOSOIS data centers serve a diverse user community and are tasked to provide facilities to search and access science data and products. The coors data system and its archive have become increasingly important to many national and international science communities, in pal1icular several of the operational services within the International Association of Geodesy (lAG) and its project the Global Geodetic Observing System (GGOS), including the International OORIS Service (IDS), the International GNSS Service (IGS), the International Laser Ranging Service (ILRS), the International VLBI Service for Geodesy and Astrometry (IVS), and the International Earth Rotation Service (IERS). The coors has recently expanded its archive to supp011 the IGS Multi-GNSS Experiment (MGEX). The archive now contains daily and hourly 3D-second and subhourly I-second data from an additional 35+ stations in RINEX V3 fOm1at. The coors will soon install an Ntrip broadcast relay to support the activities of the IGS Real-Time Pilot Project (RTPP) and the future Real-Time IGS Service. The coors has also developed a new web-based application to aid users in data discovery, both within the current community and beyond. To enable this data discovery application, the CDDIS is currently implementing modifications to the metadata extracted from incoming data and product files pushed to its archive. This poster will include background information about the system and its user communities, archive contents and updates, enhancements for data discovery, new system architecture, and future plans.
    Keywords: Social and Information Sciences (General)
    Type: GSFC.ABS.00390.2012 , International GNSS Service (IGS) Workshop 2012; Jul 23, 2012 - Jul 27, 2012; Olsztyn; Poland
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    The IGS Global Data Center at the CDDIS: An Update (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: The Crustal Dynamics Data Information System (CDDIS) has served as a global data center for the International GPS Service (IGS) since its start in June 1992, providing on-line access to data from nearly 300 sites on a daily basis. The CDDIS provides easy and ready access to a variety of data sets, products, and information about these data. The specialized nature of the CDDIS lends itself well to enhancement and thus can accommodate diverse data sets and user requirements. This poster paper will present information about the GPS and GLONASS data and products archive at the CDDIS. General information about the system, the computer architecture, archive contents, and future plans, and its support of other international space geodesy services (the ILRS, IVS, and IDS) will be discussed.
    Keywords: Geophysics
    Type: IGS Workshop 2004 and Governing Board Meeting; Feb 29, 2004 - Mar 05, 2004; Berne; Switzerland
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The DORIS Data Center at the CDDIS (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The DORIS system (Doppler Orbitography and Radio positioning Integrated by Satellite) was designed and developed by CNES, the National Geographic Institute, IGN (Institut G6ographique National), and the Space Geodesy Research Group, GRGS (Groupe de Recherches de Geodesie Spatiale - CNES/CNRS/Universite Paul Sabatier) to meet new needs for the precise determination of satellite positions on their orbits and for precise positioning of terrestrial beacons. This system has been carried since 1990 on the French SPOT 2 satellite, since 1992 on the French/American satellite TOPEX/POSEIDON, and since 1998 on the French SPOT 4 satellite. It will be part of the JASON (CNES/NASA) and ENVISAT (ESA) altimetric missions and also the SPOT follow-on Earth observation missions. DORIS is a radio-electrical system which takes Doppler measurements between a satellite in low orbit and a permanent global network for the purpose, on the one hand, of determining the satellite's position in orbit, and on the other hand, of locating ground beacons with a high degree of precision.
    Keywords: Aircraft Communications and Navigation
    Type: DORIS Days 2000 Symposium; May 02, 2000 - May 03, 2000; Toulouse; France
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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