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  • Gill filaments  (4)
  • Polymer and Materials Science  (4)
  • SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Ultrastructure of the presumed ion-transporting cells in the gills of ammocoete lampreys, Lampetra fluviatilis (L.) and Lampetra planeri (Bloch) (1975)
    Springer
    Cell & tissue research 163 (1975), S. 327-341 
    Details
    ISSN: 1432-0878
    Keywords: Chloride cell ; Gill filaments ; Ultrastructure ; Ion transport ; Ammocoete ; Lampetra fluviatilis (L), Lampetra planeri (Bloch)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Mitochondria-rich cells were located in the interplatelet area of gill filaments from ammocoete Lampetra fluviatilis and L. planeri. The ultrastructure of this cell type differs from typical teleost ‘chloride cells’ by the absence of a tubular, smooth endoplasmic reticulum (SER). This difference is discussed in relation to the presumed functions of the cell and to the evolutionary histories of lampreys and teleosts. It is concluded that the mitochondria-rich cell is responsible for the active uptake of ions by the ammocoete gill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00219467
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Fine structure of the interplatelet area in the gills of the macrophthalmia stage of the river lamprey, Lampetra fluviatilis (L.) (1976)
    Springer
    Cell & tissue research 168 (1976), S. 433-443 
    Details
    ISSN: 1432-0878
    Keywords: Chloride cell ; Gill filaments ; Ultrastructure ; Ion-transport ; Macrophthalmia stage ; Lampetra fluviatilis (L.)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The interplatelet epithelium of the gills of freshwater and seawater adapted macrophthalmia stages of the river lamprey, Lampetra fluviatilis, was studied by electron microscopy. Three main cell types: basal, ion-excretory and superficial cells were identified and described. Ion-excretory cells were exposed to the environment in sea water but covered by a layer of superficial cells in fresh water. Electron-dense secretory granules in the apex of the cell were more abundant in fresh water. In fresh water, a few of the superficial cells contained numerous mitochondria and were identified as ion-uptake cells. In view of the scarcity of ion-uptake cells, the possibility that the ion-excretory cells are also responsible for ion-uptake in fresh water is discussed. Phagocytic removal of degenerating ion-excretory cells may be an important mechanism for the conservation of materials in a starving animal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00215994
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  • 3
    Electronic Resource
    Electronic Resource
    Changes in the ultrastructure of the gills of the river lamprey, Lampetra fluviatilis (L.), during the anadromous spawning migration (1976)
    Springer
    Cell & tissue research 173 (1976), S. 271-277 
    Details
    ISSN: 1432-0878
    Keywords: Chloride cell ; Gill filaments ; Ultrastructure ; Ion transport ; Migration ; River lamprey ; Lampetra fluviatilis (L)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Two types of mitochondria-rich cells were found in the interplatelet areas of the gills of the migrating river lamprey. Both cell types are thought to be responsible for ion-transport across the gills. In the fresh-run migrant the gills are dominated by large, flask-shaped cells which show some ultra-structural similarities with the teleost chloride cell and have been tentatively referred to as ion-excretory cells. During the spawning migration the ion-excretory cells are replaced by smaller, mitochondria-rich cells which are similar in structure to the presumed ion-transporting cells in the ammocoete gill. They lack the tubular, smooth-membraned endoplasmic reticulum so characteristic of the lamprey ion-excretory cell and the teleost chloride cell and have been referred to as ion-uptake cells. The ion-uptake cells are found during the stenohaline, freshwater phases of the lamprey's life history. Ion-excretory cells are present during the periods of the life cycle when the animal is euryhaline. The possibility that the ion-excretory cells are also responsible for ion-uptake in fresh water is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221380
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  • 4
    Electronic Resource
    Electronic Resource
    Sexual dimorphism in the gills of the spawning river lamprey, Lampetra fluviatilis L. (1977)
    Springer
    Cell & tissue research 180 (1977), S. 1-10 
    Details
    ISSN: 1432-0878
    Keywords: Chloride cell ; Gill filaments ; Ultrastructure ; Ion transport ; Male glandular cell ; Spawning ; Lampetra fluviatilisit L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Two types of mitochondria-rich cells were found in the interplatelet areas of the gills of sexually mature, male river lampreys. Type 1 cells (previously referred to as “male glandular cells”) showed some ultrastructural characteristics in common with ion-transporting cells but were readily distinguished by large lipid structures with electron-lucent centres. Type 2 cells were found to be identical to the presumed ion-uptake cells found during other stenohaline freshwater phases of the animal's life history. In the sexually mature female, only Type 2 cells were positively identified. This sexual dimorphism in gill structure is discussed in relation to the possible functions of the lamprey gill, with particular reference to ionic regulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227026
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  • 5
    Electronic Resource
    Electronic Resource
    Biodegradability of photooxidized polyalkylenes (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 2581-2597 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Representative polyolefin films were exposed to UV radiation from light sources having different intensities and spectral distribution including the quartz mercury arc fluorescent lamps, xenon arc, and sunlight. Films exposed were polyethylene, polypropylene, and sensitized polyethylene. The oligomer fractions supported microbial growth, but the high polymers gave minimal or no growth. It was concluded that photooxidative degradation of polyolefins does not per se induce progressive attack by microorganisms. Oligomers present originally in the polymer are augmented by those produced by photooxidation. These oligomers support growth if separated from the polymer matrix. These observations explain some of the contradictory reports in the literature concerning the microbial degradation of sensitized polyolefins.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070290814
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  • 6
    Electronic Resource
    Electronic Resource
    Pressure quenching and chain-extended crystallization of polyethylene (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 13 (1975), S. 1501-1509 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Recent work has shown that so-called chain-extended crystallization of polyethylene is crystallization of the newly discovered hexagonal phase. This hypothesis is supported by experiments on the pressure quenching of molten polyethylene.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1975.180130804
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  • 7
    Electronic Resource
    Electronic Resource
    Hydrogen chain transfer in olefin polymerization with organometallic catalysts (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 16 (1978), S. 2337-2342 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Hydrogen has been shown to be a true chain-transfer agent with some organometallic olefin polymerization catalysts. However, the Mayo equation for chain transfer in free-radical polymerization does not fit quantitative data from organometallic catalysts. There appear to be two reasons for the lack of fit. First, the Mayo equation considers the competition between hydrogen and olefin for the growing chain but does not account for their competitive absorption on the catalyst (coordination with vacant orbitals on the transition metal). Second, some organometallic catalysts gradually absorb hydrogen irreversibly to give a new catalyst species of altered behavior.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.170160920
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  • 8
    Electronic Resource
    Electronic Resource
    Molecular weight distribution in polypropylene glycol 2025 (1963)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 1 (1963), S. 1041-1048 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The new applications of polypropylene glycols as chemical intermediates, particularly in the polyurethane field, have shifted emphasis from purely physical properties, such as density, viscosity, and volatility, to chemical properties, such as hydroxyl content, unsaturation, and molecular weight: Because much interest is also being shown in the uniformity of chain length, i.e., the “molecular purity” of the polypropylene glycol, methods were investigated for measuring this property. A liquid chromatographic procedure has been developed which will yield molecular weight distributions for polypropylene glycols in the 2025 number-average molecular weight range. The results approximate, but do not match, the values obtained by theoretical calculations. Details of the method and a typical distribution curve are presented.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1963.100010317
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  • 9
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    Helios mission support (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Deep Space Network support of the Helios mission is reported. Downlink signal degradation on the Helios-1 spacecraft and occultation of Helios-2 are discussed. Capability and performance of the network are assessed.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: The Deep Space Network; p 24-27
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Sequencing Voyager II for the Uranus encounter (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The process of developing the programmed sequence of events necessary for the Voyager 2 spacecraft to return desired data from its Uranus encounter is discussed. The major steps in the sequence process are reviewed, and the elements of the Mission Sequence Software are described. The design phase and the implementation phase of the sequence process are discussed, and the Computer Command Subsystem architecture is examined in detail. The software's role in constructing the sequences and converting them into onboard programs is elucidated, and the problems unique to the Uranus encounter sequences are considered.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: AIAA PAPER 86-2111
    Format: text
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    NASA TECHNICAL REPORTS
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