ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Hyposmotic shock-induced discharge in acontia ofCalliactis parasitica is blocked by gadolinium (1994)
    Springer
    Cellular and molecular life sciences 50 (1994), S. 148-152 
    Details
    ISSN: 1420-9071
    Keywords: Calliactis parasitica ; nematocytes ; discharge ; hyposmotic shock ; Gd3+
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract On acontia ofCalliactis parasitica it was observed that mechanical stimuli applied by a gelatin probe, a method effective in tentacles of Anthozoa, do not induce the discharge of nematocytes. Hyposmotic shock, performed by treatment with NaCl solution 35% hyposmotic with respect to sea water, induces, in the presence of Ca2+, the discharge that spreads along the acontial filament, as previously observed following treatment with SCN−. The hyposmotic shock-induced discharge is blocked by Gd3+ at a concentration of 1 μM. 10 μM Gd3+ prevents also the SCN−-induced discharge. These results suggest the presence of stretch activated cation channels either in nematocytes and/or in supporting cells as well as a possible effect of SCN− on this class of ion channels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01984954
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Effects of controlled treatment with trypsin on the functional characteristics of isolated nematocysts of Calliactis parasitica and Aiptasia mutabilis (Cnidaria, Actiniaria) (1991)
    Springer
    Hydrobiologia 216-217 (1991), S. 655-660 
    Details
    ISSN: 1573-5117
    Keywords: Calliactis parasitica ; Aiptasia mutabilis ; anemones ; Anthozoa ; nematocysts ; discharge ; trypsin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Glycerol-isolated basitrichs of Calliactis parasitica responsive to thioglycolate had open apical flaps, while unresponsive capsules isolated with Triton X100 or by freezing had closed apical flaps. Limited treatment with trypsin induced the apical flaps to open without causing discharge, suggesting that nematocysts can maintain the resting condition even with open flaps. Trypsin-treated basitrichs acquire a high responsiveness to thioglycolate. Microbasic mastigophores of Aiptasia mutabilis are more responsive to distilled water after controlled trypsin treatment but the apical flaps are unchanged. Ca2+ is inhibitory regardless of trypsin treatment. It is proposed that the capsule tip may control the penetration of the discharging agents rather than providing mechanical resistance to inner pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026527
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    facet.materialart.
    Unknown
    Sea-level fluctuations due to subduction: The role of mantle rheology (2008)
    AGU
    Details
    Publication Date: 2017-04-04
    Description: By means of a stratified viscoelastic Earth model we study the effect of sinking slabs on the dynamic topography, the non-hydrostatic geoid and the long-term sea level variations. Sea level fluctuations due to subduction are found to be sensitive to the nature of the 670 km seismic discontinuity and to the rheological layering of the mantle. The response of our model to both a single subduction and a realistic distribution of slabs is studied by a numerical simulation based on a simplified approach. Consistent with previous results, we find that an upper bound to relative sea level time variations associated with the initiation of a new subduction in the upper mantle is ∼0.1 mm/yr. Relative sea level changes driven by the dynamic readjustment of internal mass heterogeneities may thus be comparable with those attributed to other changes in the tectonic regime on a large scale. This confirms the relevance of subduction as an important contributor to long-term sea level fluctuations.
    Description: Published
    Description: 1587–1590
    Description: 3.3. Geodinamica e struttura dell'interno della Terra
    Description: JCR Journal
    Description: reserved
    Keywords: sea level ; geoid ; dynamic topography ; subduction ; viscosity profile ; 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
  • 4
    facet.materialart.
    Unknown
    Relative sea level variations caused by subduction (2008)
    Kluwer Academic Publishers
    Details
    Publication Date: 2017-04-04
    Description: By means of a stratified Earth model with viscoelastic rheology, we have studied the long-term global fluctuations of Relative Sea Level (RSL) induced by subducting slabs. We have computed RSL variations for both a single subduction and a realistic distribution of slabs by a numerical simulation based on a simplified model of the subduction process. RSL is determined by the offset between the geoid and the dynamic topography; our analysis demonstrates that the latter provides the prevailing contribution. We have studied, in addition, the effects of rheological stratification upon the amplitude and time-evolution of these two quantities and, consequently, of RSL fluctuations. According to our results, an upper bound for the rate of RSL associated with subduction is of the order of 0.1 mm/yr, in agreement with previous studies. This rate of sea level variation is comparable with that attributed to changes in the tectonic regime on a large scale. This preliminary result corroborates the suggestion by other authors to include subduction in the list of geophysical mechanisms which contribute to long-term RSL fluctuations.
    Description: Published
    Description: 225–238
    Description: 3.3. Geodinamica e struttura dell'interno della Terra
    Description: JCR Journal
    Description: reserved
    Keywords: dynamic topography ; geoid ; sea level ; subduction ; viscosity profile ; 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    PAPER (OA)
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...