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  • 1
    Online-Ressource
    Online-Ressource
    MPSA abstracts
    Springer Science and Business Media LLC ; 1994
    In:  Journal of Protein Chemistry Vol. 13, No. 5 ( 1994-07), p. 515-543
    Details
    In: Journal of Protein Chemistry, Springer Science and Business Media LLC, Vol. 13, No. 5 ( 1994-07), p. 515-543
    Materialart: Online-Ressource
    ISSN: 0277-8033 , 1573-4943
    URL: Article
    DOI: 10.1007/BF01898856
    Sprache: Englisch
    Verlag: Springer Science and Business Media LLC
    Publikationsdatum: 1994
    ZDB Id: 2017225-4
    ZDB Id: 2143071-8
    SSG: 12
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Online-Ressource
    Online-Ressource
    Daily carbon, nitrogen and phosphorus budgets for the Mediterranean planktivorous damselfish Chromis chromis
    Elsevier BV ; 2007
    In:  Journal of Experimental Marine Biology and Ecology Vol. 352, No. 2 ( 2007-12), p. 378-391
    Details
    In: Journal of Experimental Marine Biology and Ecology, Elsevier BV, Vol. 352, No. 2 ( 2007-12), p. 378-391
    Materialart: Online-Ressource
    ISSN: 0022-0981
    URL: Article
    DOI: 10.1016/j.jembe.2007.08.016
    Sprache: Englisch
    Verlag: Elsevier BV
    Publikationsdatum: 2007
    ZDB Id: 410283-6
    ZDB Id: 1483103-X
    SSG: 12
    SSG: 7,20
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  • 3
    Online-Ressource
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    Burrow Ventilation in the Tube-Dwelling Shrimp Callianassa Subterranea (Decapoda: Thalassinidea): III. Hydrodynamic Modelling and the Energetics of Pleopod Pumping
    The Company of Biologists ; 1998
    In:  Journal of Experimental Biology Vol. 201, No. 14 ( 1998-07-01), p. 2171-2181
    Details
    In: Journal of Experimental Biology, The Company of Biologists, Vol. 201, No. 14 ( 1998-07-01), p. 2171-2181
    Kurzfassung: The process of flow generation with metachronally beating pleopods in a tubiform burrow was studied by designing a hydrodynamic model based on a thrust–drag force balance. The drag of the tube (including the shrimp) comprises components for accelerating the water into the tube entrance, for adjusting a parabolic velocity profile, for accelerating the flow into a constriction due to the shrimp’s body and another constriction due to the extended tail-fan, for shear due to separation and for the viscous resistance of all tube parts. The thrust produced by the beating pleopods comprises components for the drag-based thrust and for the added-mass-based thrust. The beating pleopods are approximated by oscillating flat plates with a different area and camber during the power stroke and the recovery stroke and with a phase shift between adjacent pleopod pairs. The added mass is shed during the second half of the power stroke and is minimized during the recovery stroke. A force balance between the pleopod thrust and the tube drag is effected by calculating the mean thrust during one beat cycle at a certain flow velocity in the tube and comparing it with the drag of the tube at that flow velocity. The energetics of the tube and the pump are derived from the forces, and the mechanical efficiency of the system is the ratio of these two. Adjusted to standard Callianassa subterranea values, the model predicts a mean flow velocity in the tube of 1.8 mm s−1. The mean thrust force, equalling the drag, is 36.8 μN, the work done by the pleopod pump per beat cycle is 0.91 μJ and the energy dissipated by the tube system is 0.066 μJ per cycle. The mechanical efficiency is therefore 7.3 %. Pump characteristics that may be varied by the shrimp are the beat frequency, the phase shift, the amplitude and the difference in pleopod area between the power and recovery strokes. These parameters are varied in the model to evaluate their effects. Furthermore, the moment of added mass shedding, the distance between adjacent pleopods, the number of pleopods and the total tube drag were also varied to evaluate their effects.
    Materialart: Online-Ressource
    ISSN: 0022-0949 , 1477-9145
    URL: Article
    DOI: 10.1242/jeb.201.14.2171
    Sprache: Englisch
    Verlag: The Company of Biologists
    Publikationsdatum: 1998
    ZDB Id: 1482461-9
    SSG: 12
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    Online-Ressource
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    Copepod feeding currents: flow patterns, filtration rates and energetics
    The Company of Biologists ; 2003
    In:  Journal of Experimental Biology Vol. 206, No. 2 ( 2003-01-15), p. 255-267
    Details
    In: Journal of Experimental Biology, The Company of Biologists, Vol. 206, No. 2 ( 2003-01-15), p. 255-267
    Kurzfassung: Particle image velocimetry was used to construct a quasi 3-dimensional image of the flow generated by the feeding appendages of the calanoid copepod Temora longicornis. By scanning layers of flow, detailed information was obtained on flow velocity and velocity gradients. The flow around feeding T. longicornis was laminar, and was symmetrical viewed dorsally, but highly asymmetrical viewed laterally, with high levels of vorticity on the ventral side. The flow rate through the feeding appendages varied between 77 and 220 ml day-1 per individual. The morphology of the flow field ensured that water was entrained over the full length of the first antennae. These were kept out of areas with high velocity gradients that could interfere with distant mechano- or chemoreception. The volume of influence, i.e. the volume of water around the foraging copepod, where shear rates were significantly higher than background levels,was calculated. Implications for encounter probability and mechanoreception are discussed. The average rate of energy dissipation within the copepod's volume of influence is several times higher than the levels of turbulent energy dissipation these animals are likely to encounter in their environment. Even in highly turbulent environments, adult T. longicornis will not experience very significant effects of turbulence. Within the volume of influence of the copepods the energy dissipation due to viscous friction varied between 6.6×10-11 and 2.3×10-10W. Taking mechanical efficiency and muscle efficiency into account, this results in a total energetic cost of the feeding current of 1.6×10-9W per copepod. This value represents only a small percentage of the total energy budget of small calanoid copepods.
    Materialart: Online-Ressource
    ISSN: 1477-9145 , 0022-0949
    URL: Article
    DOI: 10.1242/jeb.00078
    Sprache: Englisch
    Verlag: The Company of Biologists
    Publikationsdatum: 2003
    ZDB Id: 1482461-9
    SSG: 12
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 5
    Online-Ressource
    Online-Ressource
    Quantitative Flow Analysis Around Aquatic Animals Using Laser Sheet Particle Image Velocimetry
    The Company of Biologists ; 1995
    In:  Journal of Experimental Biology Vol. 198, No. 2 ( 1995-02-01), p. 283-294
    Details
    In: Journal of Experimental Biology, The Company of Biologists, Vol. 198, No. 2 ( 1995-02-01), p. 283-294
    Kurzfassung: Two alternative particle image velocimetry (PIV) methods have been developed, applying laser light sheet illumination of particle-seeded flows around marine organisms. Successive video images, recorded perpendicular to a light sheet parallel to the main stream, were digitized and processed to map the flow velocity in two-dimensional planes. In particle tracking velocimetry (PTV), displacements of single particles in two subsequent images were determined semi-automatically, resulting in flow diagrams consisting of non-uniformly distributed velocity vectors. Application of grid-cell averaging resulted in flow field diagrams with uniform vector distribution. In sub-image correlation PIV (SCPIV), repetitive convolution filtering of small sub-areas of two subsequent images resulted in automatic determination of cross-correlation peaks, yielding flow field diagrams with regularly spaced velocity vectors. In both PTV and SCPIV, missing values, caused by incomplete particle displacement information in some areas of the images or due to rejection of some erroneous vectors by the vector validation procedure, were interpolated using a two-dimensional spline interpolation technique. The resultant vector flow fields were used to study the spatial distribution of velocity, spatial acceleration, vorticity, strain and shear. These flow fields could also be used to test for flow in the third dimension by studying the divergence, and to detect the presence and location of vortices. The results offer detailed quantitative descriptions of the flow morphology and can be used to assess dissipated energy. The versatile character of the technique makes it applicable to a wide range of fluid mechanical subjects within biological research. So far it has been successfully applied to map the flow around swimming copepods, fish larvae and juvenile fish and the ventilation current of a tube-living shrimp.
    Materialart: Online-Ressource
    ISSN: 0022-0949 , 1477-9145
    URL: Article
    DOI: 10.1242/jeb.198.2.283
    Sprache: Englisch
    Verlag: The Company of Biologists
    Publikationsdatum: 1995
    ZDB Id: 1482461-9
    SSG: 12
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 6
    Online-Ressource
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    Burrow Ventilation in the Tube-Dwelling Shrimp Callianassa Subterranea (Decapoda: Thalassinidea):II. The Flow in the Vicinity of the Shrimp and the Energetic Advantages of a Laminar Non-Pulsating Ventilation Current
    The Company of Biologists ; 1998
    In:  Journal of Experimental Biology Vol. 201, No. 14 ( 1998-07-01), p. 2159-2170
    Details
    In: Journal of Experimental Biology, The Company of Biologists, Vol. 201, No. 14 ( 1998-07-01), p. 2159-2170
    Kurzfassung: The ventilation flow in the vicinity of the pleopod-pumping thalassinid shrimp Callianassa subterranea in an artificial transparent burrow has been mapped using particle image velocimetry. The flow in the tube in front of the shrimp was unidirectional, laminar and steady, with a parabolic cross-sectional velocity profile. The mean flow velocity was 2.0±0.1 mm s−1. The flow passed the thorax of the shrimp along the lateral and ventral sides. Ventral to the abdomen, the flow was dominated by the metachronally oscillating pleopods. The water around a pleopod is accelerated caudally and ventrally during the power stroke, and decelerated to a much lesser extent during the recovery stroke owing to a reduction in pleopod area. On average, the flow ventral to the abdomen converged towards the small opening underneath the telson, simultaneously increasing in velocity. A jet with a core velocity of 18–20 mm s−1 entered the area behind the shrimp from underneath the telson. This caused a separation zone with backflow caudal to the telson. Owing to the high rates of shear, the jet diverged and re-adjusted to a parabolic cross-sectional profile within 1–2 body lengths behind the shrimp, showing no traces of pulsation. The metachronal pleopod movements in combination with the increase in flow velocity at the constriction in the tube caused by the uropods and the telson probably prevented pulsation. The energetic consequences of pulsating and steady flows in combination with several tube configurations were evaluated. The results suggested that, by constricting the tube and keeping the flow steady, C. subterranea saves on ventilation costs by a factor of up to six compared with oscillatory flow in a tube without the tail-fan constriction.
    Materialart: Online-Ressource
    ISSN: 0022-0949 , 1477-9145
    URL: Article
    DOI: 10.1242/jeb.201.14.2159
    Sprache: Englisch
    Verlag: The Company of Biologists
    Publikationsdatum: 1998
    ZDB Id: 1482461-9
    SSG: 12
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 7
    Online-Ressource
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    HOW THE BODY CONTRIBUTES TO THE WAKE IN UNDULATORY FISH SWIMMING
    The Company of Biologists ; 2001
    In:  Journal of Experimental Biology Vol. 204, No. 16 ( 2001-08-15), p. 2751-2762
    Details
    In: Journal of Experimental Biology, The Company of Biologists, Vol. 204, No. 16 ( 2001-08-15), p. 2751-2762
    Kurzfassung: Undulatory swimmers generate thrust by passing a transverse wave down their body. Thrust is generated not just at the tail, but also to a varying degree by the body, depending on the fish's morphology and swimming movements. To examine the mechanisms by which the body in particular contributes to thrust production, we chose eels, which have no pronounced tail fin and hence are thought to generate all their thrust with their body. We investigated the interaction between body movements and the flow around swimming eels using two-dimensional particle image velocimetry. Maximum flow velocities adjacent to the eel's body increase almost linearly from head to tail, suggesting that eels generate thrust continuously along their body. The wake behind eels swimming at 1.5Ls-1, where L is body length,consisted of a double row of double vortices with little backward momentum. The eel sheds two vortices per half tail-beat, which can be identified by their shedding dynamics as a start—stop vortex of the tail and a vortex shed when the body-generated flows reach the `trailing edge' and cause separation. Two consecutively shed ipsilateral body and tail vortices combine to form a vortex pair that moves away from the mean path of motion. This wake shape resembles flow patterns described previously for a propulsive mode in which neither swimming efficiency nor thrust is maximised but sideways forces are high. This swimming mode is suited to high manoeuvrability. Earlier recordings show that eels also generate a wake reflective of maximum swimming efficiency. The combined findings suggest that eels can modify their body wave to generate wakes that reflect their propulsive mode.
    Materialart: Online-Ressource
    ISSN: 1477-9145 , 0022-0949
    URL: Article
    DOI: 10.1242/jeb.204.16.2751
    Sprache: Englisch
    Verlag: The Company of Biologists
    Publikationsdatum: 2001
    ZDB Id: 1482461-9
    SSG: 12
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 8
    Online-Ressource
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    Genetic Relationships Among One Non-Endemic and Two Endemic Mediterranean Triplefin Blennies (Pisces, Blennioidei)
    Wiley ; 2001
    In:  Marine Ecology Vol. 22, No. 3 ( 2001-09), p. 255-265
    Details
    In: Marine Ecology, Wiley, Vol. 22, No. 3 ( 2001-09), p. 255-265
    Materialart: Online-Ressource
    ISSN: 0173-9565 , 1439-0485
    URL: Article
    DOI: 10.1046/j.1439-0485.2001.01738.x
    Sprache: Englisch
    Verlag: Wiley
    Publikationsdatum: 2001
    ZDB Id: 2020745-1
    ZDB Id: 225578-9
    SSG: 12
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 9
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    A Quantitative Assessment of the Reproductive System of the Mediterranean Cave-Dwelling Triplefin Blenny Tripterygion melanurus
    Wiley ; 2002
    In:  Marine Ecology Vol. 23, No. 4 ( 2002-12), p. 327-340
    Details
    In: Marine Ecology, Wiley, Vol. 23, No. 4 ( 2002-12), p. 327-340
    Materialart: Online-Ressource
    ISSN: 0173-9565 , 1439-0485
    URL: Article
    DOI: 10.1046/j.1439-0485.2002.02789.x
    Sprache: Englisch
    Verlag: Wiley
    Publikationsdatum: 2002
    ZDB Id: 2020745-1
    ZDB Id: 225578-9
    SSG: 12
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 10
    Online-Ressource
    Online-Ressource
    The social and mating system of the herbivorous reef fishSparisoma viride: one-male versus multi-male groups
    Springer Science and Business Media LLC ; 1996
    In:  Environmental Biology of Fishes Vol. 47, No. 4 ( 1996-12), p. 353-378
    Details
    In: Environmental Biology of Fishes, Springer Science and Business Media LLC, Vol. 47, No. 4 ( 1996-12), p. 353-378
    Materialart: Online-Ressource
    ISSN: 0378-1909 , 1573-5133
    URL: Article
    DOI: 10.1007/BF00005050
    Sprache: Englisch
    Verlag: Springer Science and Business Media LLC
    Publikationsdatum: 1996
    ZDB Id: 196790-3
    ZDB Id: 1497685-7
    SSG: 21,3
    SSG: 12
    Standort Signatur Einschränkungen Verfügbarkeit
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