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  • 1
    Electronic Resource
    Electronic Resource
    Ultrastructural observations on the gills of polychaetes (1978)
    Springer
    Helgoland marine research 31 (1978), S. 169-179 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The gills of several polychaete species belonging to 9 families were studied by scanning and transmission electron microscopy. The surface epithelium is covered by a thin cuticle which is invaded by microvilli penetrating the epicuticle in certain species. Some epithelial cells bear cilia, others are mucus-producing cells. The ciliary cells may be arranged in rows and maintain a constant flow of water over the gills. The distance between external water and blood stream differs considerably according to the species investigated. InMalacoceros the gills are characterized by closed afferent and efferent subepithelial vessels, which correspond to tubular invaginations of the coelomic wall. These vessels are lined by the basement lamina of the coelothelial cells, which are of the epitheliomuscular type. The vessels are open in the gills of other polychaetes and release the blood stream into a system of spaces immediately below the epidermis (e.g. in the branchial lamellae ofPectinaria andTerebellides). In several species the blood comes into very intimate contact with the cuticle (e.g. in the gill filaments ofDendronereides), but also in these animals both are separated by a very small epidermal layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02296995
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    Paper (German National Licenses)
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  • 2
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    Unknown
    Experimental results from a stepped frequency GPR (2006)
    INGV
    Details
    Publication Date: 2019-11-04
    Description: In the framework of a nationally funded project, a Ground Penetrating Radar (GPR) has been developed by the Italian Consortium for Research on Advanced Remote Sensing Systems (CO.RI.S.T.A.). The system was described in a previous paper (Alberti et al., 2002). As new aspects, the system is a stepped frequency GPR that can work both in gated and ungated mode, and the antennas can be moved automatically in a controlled fashion. As aspects of geophysical interest, the system is exploitable in situations wherein a high resolution and a shallow penetration in the soil (a few meters) are required. Possibly, this is an example of probing a landscape. This paper completes the results of Alberti et al. (2002), wherein laboratory tests where described, by providing the main results obtained during an outdoor experimental campaign, performed fi rst in a controlled site and then in an archaeological site.
    Description: Published
    Description: JCR Journal
    Description: open
    Keywords: stepped frequency radar ; GPR system ; 04. Solid Earth::04.02. Exploration geophysics::04.02.07. Instruments and techniques
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 4731209 bytes
    Format: application/pdf
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  • 3
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    A stepped frequency GPR system for underground prospectingGiovanni Galiero, Raffaele Persico, Marco Sacchettino and Sergio Vetrella (2006)
    INGV
    Details
    Publication Date: 2019-11-04
    Description: loped by the Italian Consortium for Research on Advanced Remote Sensing Systems (CO.RI.S.T.A.). The system has been specially designed to satisfy archaeological requirements and it will be used to identify and characterise buried objects. The system is a stepped frequency GPR. It can work within a wide band of frequencies both in gated and ungated mode, and it has been already widely described in (Alberti et al., 2000). This paper describes the results of calibration tests in ungated mode performed in the CO.RI.S.T.A. laboratory. In particular, they show that the system can guarantee a dynamic range of about 96 dB.
    Description: Published
    Description: JCR Journal
    Description: open
    Keywords: stepped frequency ; GPR ; 04. Solid Earth::04.02. Exploration geophysics::04.02.05. Downhole, radioactivity, remote sensing, and other methods
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 364376 bytes
    Format: application/pdf
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