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  • Articles  (4)
  • Germany  (2)
  • AChE  (1)
  • Brain
  • temperature adaptation
  • Springer  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Developmental profiles of gangliosides in mouse and rat cerebral cortex (1982)
    Springer
    Development genes and evolution 191 (1982), S. 281-284 
    Details
    ISSN: 1432-041X
    Keywords: Mammals ; Brain cortex ; Gangliosides ; Glycoproteins ; AChE ; Development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Developmental profiles of 11 gangliosides, concentration of lipid- and glycoprotein-bound sialic acid, and activity of AChE of the rat and mouse cerebral cortex were followed from the 7th day of gestation to the 21st postnatal day. There are three main changes in ganglioside concentration, which are similar in both species. The first occurs from gestation day 10 until birth: parallel to decreased proliferation, cell migration, and neuroblast differentiation, GM3 and GD3 in mouse cortex and GD3 in the rat's decreases in favor of GQ1b, GT1b, and GD1a. The second occurs from birth until the first postnatal week: Parallel to increased growth and arborization of dendrites and axons as well as synaptogenesis in rats and mice, there is a two-fold rise of GD1a, whereas GQ1b and GT1b remain on a nearly constant level. Concomitantly, GM3 and GD3 decreases. The third period of ganglioside changes starts in the second postnatal week, parallel to onset of myelination, and is characterized by an increase of GM1 in parallel with a decrease of the polysialogangliosides GT1b and GQ1b.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848417
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  • 2
    Electronic Resource
    Electronic Resource
    Upstream movements of benthic macroinvertebrates in two different types of fishways in southwestern Germany (1998)
    Springer
    Hydrobiologia 391 (1998), S. 47-61 
    Details
    ISSN: 1573-5117
    Keywords: benthic macroinvertebrates ; upstream migration ; fishways ; barriers ; Germany
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Upstream movements and migrations of benthic macroinvertebrates are an important component of running water dynamics. Many lotic organisms perform upstream movements at some stage in their life-cycle. We investigated whether a boulder ramp and a concrete bypass fishway on two streams in Baden-Württemberg, Germany, are successfully used by benthic invertebrates to reach upstream areas. We compared macroinvertebrate distribution at sites upstream and downstream of the fishways, rated the fishways according to their constructional features and conducted migration experiments with marked Gammaridae in the passages. The number of taxa and densities of macroinvertebrates did not significantly differ between upstream and downstream sites in both rivers. Constructional features and the results of the mark-recapture experiments indicated that the boulder ramp allows upstream migrations in principal, whereas the bypass is more difficult for macroinvertebrates to ascend. Both fishways immediately exit into an impoundment, which is a potential barrier for migrating invertebrates. High average current velocities, lack of lenitic banks and sheltered interstices, as well as problems caused by the operation of a power plant are factors explaining why the Enz River bypass is only marginally functional for invertebrates. The investigation concludes that in constructing fishways suitable for upstream movements of lotic invertebrates, more attention should be paid to their specific requirements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003594726288
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  • 3
    Electronic Resource
    Electronic Resource
    Macroinvertebrate functional feeding group methods in ecological assessment (2000)
    Springer
    Hydrobiologia 422-423 (2000), S. 225-232 
    Details
    ISSN: 1573-5117
    Keywords: benthic macroinvertebrates ; functional feeding groups ; disturbance ; metrics ; index ; Germany
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Six functional feeding group (FFG) indices applied in ecological assessment were tested for their accuracy in detecting impairment in 12 cases of disturbance on 11 streams in south-western Germany. Three metrics – percentage of predators, percentage of shredders and Rhithron-Ernährungstypen-Index RETI – performed well in small highland streams up to five m width. The FFG metrics were compared to the taxonomic measures `percentage of Chironomidae' and `percentage of ephemeropteran, plecopteran and trichopteran taxa' (EPT) used the U.S.A., and to a metric based on locomotion type (percentage of sessile taxa). As the implementation of such metrics implies the use of ecological data tables, some aspects of the pro and contra of European ecological lists published in recent years were critically assessed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017078401734
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  • 4
    Electronic Resource
    Electronic Resource
    Gangliosides Affect Membrane-Channel Activities Dependent on Ambient Temperature (2000)
    Springer
    Cellular and molecular neurobiology 20 (2000), S. 579-590 
    Details
    ISSN: 1573-6830
    Keywords: bilayer ; alamethicin ; homoioviscosity ; gangliosides ; temperature adaptation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract 1. The functional properties of biological membranes depend on their molecular composition. In regard to this, charged glycosphingolipids play an outstanding role in the functional adaptation of membranes to different temperatures. 2. In order to shed some light on the respective functional properties of complex membraneous glycosphingolipids, the effects of altered temperatures (5–40°C) on planar lipid bilayers made from diphytanoylphosphatidylcholine (DPPC) and alamethicin as an ion channel was analyzed in the presence of either a sialoglycosphingolipid (less polar disialoganglioside GD1a or highly polar tetrasialoganglioside GQ1b) or phosphatidylserine (PS; as control). 3. Different to the control bilayers made from DPPC or DPPC + PS, the bilayers containing gangliosides had specific maxima in alamethicin conductance and stabile life times. Changes in pore-state conductances indicate structural effects based on an interaction of the large (negatively charged) ganglioside headgroups with the alamethicin pores. 4. The results concerning open time and closed time of channels seem to be based on the gangliosides changing the viscosity of the bilayer and possibly introducing phase transitions. 5. Thus, the findings suggest that gangliosides (1) directly affect channel molecules via their headgroups and (2) may additionally affect the fluidity of membranes in order to maintain membrane homeoviscosity in areas surrounding ion channels independent from the environmental temperature. 6. The effects of gangliosides may be of special interest in describing the ability of neuronal adaptation of vertebrates to temperature and more general regarding the functional adaptation of neurons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007063928449
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