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  • 1
    Electronic Resource
    Electronic Resource
    Control of Colour Change in Amphibians (1960)
    [s.l.] : Nature Publishing Group
    Nature 186 (1960), S. 641-642 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] H gben et al. argue for the participation of a whitening hormone in the colour response to the background2. Their theory can be summarized as follows : light-stimulation of the ventral area of retina causes reflex liberation of intermedin ; light -stimulation of the dorsal area of the retina causes ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/186641a0
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  • 2
    Electronic Resource
    Electronic Resource
    Hormonal Control of Moulting in Amphibians (1960)
    [s.l.] : Nature Publishing Group
    Nature 185 (1960), S. 244-245 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It is well known that moulting is abnormal in hypophysectomized amphibians. This is especially conspicuous in toads and most urodeles where hypophysectomy prevents shedding of the slough, whereas formation of strata cornea continues; eventually a dark-brown, thick, cornified layer covers the skin. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/185244a0
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  • 3
    Electronic Resource
    Electronic Resource
    Feeding-Rates of Sponges, Lamellibranchs and Ascidians (1949)
    [s.l.] : Nature Publishing Group
    Nature 163 (1949), S. 912-912 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] MANY water-living animals obtain their food from suspended material, micro-organisms or fine dispersed detritus occurring in the surrounding water. Sponges and ascidians, for example, are typical filtering animals. Most lamellibranchs belong to the same group. But filtering forms may also be ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/163912a0
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  • 4
    Electronic Resource
    Electronic Resource
    Efficiency of Growth in Mytilus edulis and Two Gastropod Veligers (1952)
    [s.l.] : Nature Publishing Group
    Nature 170 (1952), S. 714-714 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] From the accompanying table it is seen that the efficiency of growth is of the same order in veligers of Mytilus. Littorina and Nassa. Furthermore, the efficiency of growth in Mytilus does not significantly change on metamorphosis. Owing to the heterogeneity of the material the increase in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/170714a0
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  • 5
    Electronic Resource
    Electronic Resource
    A hydromechanical principle for particle retention in Mytilus edulis and other ciliary suspension feeders (1981)
    Springer
    Marine biology 61 (1981), S. 277-282 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract It is generally thought that the laterofrontal cirri of the bivalve gill act as filters that retain suspended particles in the through current and transfer the particles onto the frontal surface of the gill filaments. In Mytilus edulis calculations indicated that if water passed between the branching cilia of the cirri that are assumed to constitute the filter the pressure drop needed would amount to about 10 times the actual pressure drop across the whole gill. Thus, instead of acting as filters the laterofrontal cirri seem to move water. Presumably, the cirri together with the frontal cilia produce the water currents along the frontal surface of the gill filaments. Particle retention in the bivalve gill implies the transfer of suspended particles from the current of water about to enter an interfilamentar space into a neighbouring frontal surface current. The complex three-dimensional pattern of flow that arises where the 2 systems of current meet is characterized by steep velocity gradients. Particles that enter such steep, steady velocity gradients become exposed to transverse forces that cause the particles to migrate perpendicularly to the direction of flow. Whether particles enter the surface current, i.e. are retained, or they stay within the through current andescape, depends primarily upon particle size, and upon the steepness and height of the gradients within the boundary zone between the surface current and through current. Further studies are needed to evaluate the capacities and relative importance of this hydromechanical particle-trapping mechanism in suspension feeding bivalves. It is suggested that in downstream particle-retaining systems, e.g. on the tentacles of polychaetes and entoprocts, velocity gradients between through currents and surface currents also act as the particle-collecting mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401566
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  • 6
    Electronic Resource
    Electronic Resource
    Patterns of uptake of dissolved amino acids in mussels (Mytilus edulis) (1983)
    Springer
    Marine biology 73 (1983), S. 177-182 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Uptake of dissolved amino acids was measured in mussels adapted to 50% artificial sea water or to the sea water containing 2 mM glycine. In mussels adapted to amino-acid free sea water net uptake from μmolar solutions of glycine, glutamic acid, taurine, glutamine and tyrosine could be described by the Michaelis-Menten equation. Mussels adapted to 2 mM glycine exhibited more complex patterns of uptake that changed with time after transfer to μmolar solutions of glycine. It is suggested that the properties of the epidermal transport systems are adaptable, and that they are modified by the presence of amino acids in the medium, perhaps indirectly through changes in the concentrations of the intracellular pool of free amino acids. The uptake rates measured in mussels adapted to aminoacid free sea water express the maximum capacities for net uptake. In this state of adaptation, mussels that process the surrounding water at optimal rates may clear up to about half of the water passing the mantle cavity of amino acids present at concentrations of about 1 μM. Two thirds of 3H-taurine taken up was recovered in the gills, the remaining third was about equally distributed between the mantle and the rest of the body. There was no significant loss or redistribution of label within 24 h. It is concluded that the uptake of amino acids in the mussel gill is epidermal rather than transepidermal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00406886
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of Adenohypophysectomy on the Transfer of Salt Across the Frog Skin (1947)
    [s.l.] : Nature Publishing Group
    Nature 160 (1947), S. 872-872 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT is well known that the isolated skin of the frog is able to transport salt from its outside to the inside when bathed with frog Ringer on both sides1. In view of the fact that cortical hormones play an important part in the reabsorption of sodium chloride in the kidney, an ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/160872a0
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  • 8
    Electronic Resource
    Electronic Resource
    Fluid mechanics of the mussel gill: The lateral cilia (1982)
    Springer
    Marine biology 70 (1982), S. 275-281 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Quantitative data on the water currents produced by the ciliary tracts of the gill filaments are needed to understand the fluid mechanics of suspension feeding in bivalves, as well as in other ciliary suspension feeders. This paper investigates the water currents produced by the bands of lateral cilia, as studied on isolated gill filaments, gill fragments, and intact gills of the mussel Mytilus edulis L with severed adductor muscles. The metachronally beating cilia produce oscillatory currents near the oscillating enveloping surface of the ciliary bands and rectilinear currents, the interfilamentary through-currents, farther from the surface. It is suggested that the oscillatory currents play an important role in the fluid mechanical capture of suspended particles. In the intact gill the interfilamentary currents pass the bands of lateral cilia at velocities that are two or more times higher than those generated by the bands of isolated filaments. The mussel gill is compared with an optimized peristaltic pump.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396846
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  • 9
    Electronic Resource
    Electronic Resource
    Na+-independent uptake of nutrients inTetrahymena (1978)
    Springer
    Journal of comparative physiology 125 (1978), S. 97-99 
    Details
    ISSN: 1432-136X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Cell multiplication rates in cultures ofTetrahymena pyriformis andT. thermophila were independent of the external Na+ concentrations at the levels of 0.5, 10 and 22 mM. The Nai/Na0 and Cli/Cl0 ratios were determined at the low and high Na+ concentrations, and assuming that Cl− is distributed passively, the electrochemical Na+ gradients for the two situations were calculated. The energy in these gradients allows a net co-transport of nutrients only in the high Na+ medium. Since the doubling times are independent of the Na+ concentrations we conclude thatTetrahymena can obtain its energy for nutrient uptake from other sources than the electrochemical Na+ gradient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00686745
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  • 10
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    Control of Colour Change in Amphibians (1960)
    Springer Nature
    Details
    Publication Date: 1960-05-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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