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  • 1
    Electronic Resource
    Electronic Resource
    Feeding Levels of the Southern Brown Shrimp Penaeus subtilis in Response to Food Dispersal (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the World Aquaculture Society 30 (1999), S. 0 
    Details
    ISSN: 1749-7345
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The development of efficient feed management strategies in shrimp farming involves the investigation of aspects related to time of feed distribution, feeding rates, feeding frequency, and feed dispersal methods. This work examined the feeding levels of Penaeus subtilis in response to food dispersal method under semi-intensive culture conditions. The study consisted of two treatments: 1) a uniform feed dispersal over the culture area, and 2) concentration of feed in 0.2-m2 circular feeding trays. For each, three 105-m2 rectangular enclosures were installed in a single shrimp grow-out pond and stocked with P. subtilis at a density of 14.29 postlarvae/m2. Shrimp were fed daily at 0600, 0930 and 1430 h and sampled 30 min after feed distribution at 12-d intervals. After collection, shrimp weight was determined, their stomachs dissected and weighed. A total of 2,160 stomachs of P. subtilis were collected during a 89-d rearing cycle. Relative occurrence of artificial versus natural food in stomach contents was determined by stable carbon isotope mass spectrometry. Density of polychaetes in the substrate was monitored at each sampling period. After harvest, sediment samples were collected for physical and chemical analyses. In general, differences in shrimp growth between feeding methods were not significant. Final shrimp survival rates were between 69.0 ± 6.9% and 71.9 ± 3.7%. Stomach content weight of P. subtilis was significantly higher when feed was broadcast than for feed concentration. Average stomach content weight remained constant throughout the rearing cycle, although progressive increases in feed Occurrence were detected in P. subtilis diet. No periodicity in food intake along sampling periods could be related to increases in shrimp carapace length. Food intake was significantly lower at 0600 h than at 1430 h and at 0930 h, respectively. In both treatments, over half of the food contained in the stomach contents of shrimp was derived from artificial food. Sediment chemical analysis indicated statistically lower levels of sodium in the pond bottom of concentrated treatment. However, no short-term detrimental effects were detected on sediment chemical quality. Results indicated that feed broadcasting resulted in a greater access and a higher consumption of food among the cultured shrimp population, a lower number of empty stomachs, and a greater occurrence of artificial food in P. subtilis stomach contents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-7345.1999.tb00684.x
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    Paper (German National Licenses)
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  • 2
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    Function of myosin-V in filopodial extension of neuronal growth cones (1996)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1996-08-02
    Description: The molecular mechanisms underlying directed motility of growth cones have not been determined. The role of myosin-V, an unconventional myosin, in growth cone dynamics was examined by chromophore-assisted laser inactivation (CALI). CALI of purified chick brain myosin-V absorbed onto nitrocellulose-coated cover slips inhibited the ability of myosin-V to translocate actin filaments. CALI of myosin-V in growth cones of chick dorsal root ganglion neurons resulted in rapid filopodial retraction. The rate of filopodial extension was significantly decreased, whereas the rate of filopodial retraction was not affected, which suggests a specific role for myosin-V in filopodial extension.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, F S -- Wolenski, J S -- Cheney, R E -- Mooseker, M S -- Jay, D G -- NS-29007/NS/NINDS NIH HHS/ -- NS-34699/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1996 Aug 2;273(5275):660-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular and Cellular Biology, Harvard University, 16 Divinity Avenue, Cambridge, MA 02138, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8662560" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/pharmacology ; Animals ; Axons/*physiology/ultrastructure ; Calmodulin-Binding Proteins/antagonists & inhibitors/immunology/*physiology ; Cells, Cultured ; Chick Embryo ; Dendrites/*physiology/ultrastructure ; Fluorescent Antibody Technique, Indirect ; Ganglia, Spinal/cytology ; Lasers ; Microinjections ; Myosin Light Chains/antagonists & inhibitors/immunology/*physiology ; *Myosin Type V ; Nerve Tissue Proteins/antagonists & inhibitors/immunology/*physiology ; Pseudopodia/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
    Electronic Resource
    Electronic Resource
    Dielectric mixture model for a hollow-ceramic-sphere composite (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 6456-6460 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A layered sphere Bruggeman effective-medium model was developed to describe the dielectric constant of a porous ceramic composite having potential for use as a very low dielectric constant inorganic material for microelectronic packaging. The uniqueness of this model is that it incorporates a hollow sphere geometry and thus fits closely the microstructure of the dielectric composite in a broad range of compositions. Samples of the composite were prepared by adding hollow alumina-silica alloy ceramic spheres to a cordierite matrix. Their dielectric properties were characterized as a function of volume fraction of hollow spheres. The measured results were in good agreement with the model prediction. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359119
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  • 4
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    Dielectric mixture model for a hollow‐ceramic‐sphere composite (1995)
    American Institute of Physics
    Details
    Publication Date: 1995-06-15
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics
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  • 5
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    Portable Extensible Viewer (1997)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: The use of Nonuniform Rational B-Splines (NURBS) to represent geometry and data offers a standard way to facilitate the multidisciplinary analysis and design of aeropropulsion products. Using standard geometry defined by NURBS throughout design, analysis, part definition, manufacture, and test processes saves money and time. The Portable Extensible Viewer (PEV) offers engineers of different disciplines a means to view and manipulate NURBS geometry and associated data. Under the guidance of a team of Lewis, Boeing Company, and Navy personnel, PEV was developed by NASA Lewis Research Center's Computer Services Division for Lewis' Interdisciplinary Technology Office. The aeropropulsion industry provided input to the design requirements.
    Keywords: Computer Systems
    Type: Research and Technology 1996; NASA-TM-107350
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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