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  • 1
    Electronic Resource
    Electronic Resource
    Soldier production inCamponotus novaeboracensis during colony growth (1989)
    Springer
    Insectes sociaux 36 (1989), S. 28-41 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume Dans des colonies d'importance différente chez la fourmi charpentièreCamponotus novaeboracensis, on a observé des changements dans les équations allométriques, les courbes de fréquence de taille et la distribution des castes. Les colonies naturelles ont été groupées en trois catégories selon le nombre d'ouvrières dans une colonie: colonie «juvénile» pour moins de 150 ouvrières, colonie «prémature» pour 200 à 2000 ouvrières et colonie «mature» pour plus de 2000 ouvrières et ayant produit des sexués. Il n'y avait pas de différence dans les équations allométriques entre les trois catégories, néanmoins les colonies «matures» contenaient un plus grand nombre de soldats. On a noté des différences notables dans les courbes de fréquence de taille des trois catégories.
    Notes: Summary Changes in allometry equations, size-frequency curves, and caste ratios were examined in different-sized colonies of the polymorphic carpenter antCamponotus novaeboracensis. Field collected colonies broadly grouped into three categories based on the number of workers in a colony: “incipient” if they had fewer than 150 workers, “juvenile” if they had 200 to 2,000 workers, and “mature” if they had more than 2,000 workers and had produced reproductives. There was no difference in the allometry equations between the three groups, but the mature colonies did contain a higher proportion of soldiers. The size-frequency histograms and caste ratios were significantly different between the three groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02225878
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of particle concentration on filter- and particulate-feeding in the herring Clupea harengus (1985)
    Springer
    Marine biology 88 (1985), S. 109-116 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Observations were made in the laboratory on the feeding behaviour of small shoals of captive juvenile herring (Clupea harengus) using Artemia sp. nauplii as food. The fish used two methods of feeding. The first, filter-feeding, was only used at concentrations exceeding approximately 50 nauplii l-1. Filter-feeding rapidly gave way to particulate-feeding (biting and gulping) as concentrations declined, and biting was the only method used when concentrations were 〈 50 nauplii l-1. There was a positive correlation between particle concentration and feeding acts of both types. Particle concentrations declined exponentially throughout experiments, indicating that a constant proportion was being removed during an experiment. This proportion was inversely related to the initial concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397157
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  • 3
    Electronic Resource
    Electronic Resource
    The maturation of anadromous female Atlantic salmon, Salmo salar L., stocked in a small pond in urban St John's, Newfoundland, Canada (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 34 (1989), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Anadromous Atlantic salmon swim-up fry were stocked into a small pond (surface area 4.0 ha; maximum depth 3.6 m; mean depth 1.9m) in urban St John's, Newfoundland, Canada. The outlet from the pond was placed underground about 15 years ago. The growth rate of young salmon in this pond was two to five times as fast as in populations in insular Newfoundland. Females matured after a size at which they should have smolted and emigrated to sea. Growth, fecundity, and egg size of transplanted females are compared with those of the donor stock and with those reported for populations of landlocked salmon in insular Newfoundland. The evolutionary implications of the study are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1989.tb03376.x
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  • 4
    Electronic Resource
    Electronic Resource
    Feeding relationships of a demersal fish assemblage on the west coast of Scotland (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 31 (1987), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The feeding relationships of an assemblage of demersal fishes present on a soft-sediment bottom off the west coast of Scotland in the late summer-autumn were investigated. On the basis of stomach content analyses of the fifteen commonest species, three major feeding types could be distinguished. The first consisted of small browsing species feeding predominantly on infaunal polychaetes. The second relied heavily on caridean decapods, but within this group three subgroups could be detected which supplemented their diet with amphipods, mysids or polychaetes, respectively. The third group fed on large prey consisting of mysids and/or fish. Several species passed from one group to another as they grew, and there was a general tendency for fish to become more specialized in their diet with increasing size. The three groups represent a series in which decreasing reliance is placed on the substratum as a source of food.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1987.tb05214.x
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  • 5
    Electronic Resource
    Electronic Resource
    Visual cues determining prey selection by the turbot, Scophthalmus maximus L. (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 29 (1986), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: By presenting juvenile turbot, Scophthalmus maximus L., with models and natural prey, Crangon crangon, standardised for size, some of the visual characteristics that elicit a predatory response have been determined. By far the most important stimulus was overall body movement, but appendage movements of the crustacean and a ratio of vertical to horizontal dimensions lower than about 1:5 were also of significance. The body shape of a prey was not of great importance. Evidence was obtained for the heterogeneous summation of stimuli.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1986.tb04998.x
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  • 6
    Electronic Resource
    Electronic Resource
    Picosecond gain dynamics in KrF amplifiers (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 773-775 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The steady-state and dynamic gain characteristics in a KrF amplifier are studied with the use of 1 ps pulses. A saturation energy density in the range 1.8–2.0±0.2 mJ/cm2 is measured. The recovery of the small-signal gain coefficient exhibits two recovery processes with time constants of 67±10 ps and 2.0±0.2 ns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99279
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  • 7
    Electronic Resource
    Electronic Resource
    Interference between potyviruses during aphid transmission (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 35 (1986), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Single aphids (Myzus persicae) were allowed sequential access to two leaves which were either free from infection or infected with potato virus Y° (PVY°). PVYN. beet mosaic virus (BMV), or tobacco mosaic virus (TMV). Aphids given prior or subsequent access to PVYN-infected leaves transmitted PVY° and BMV less frequently than aphids given prior or subsequent access to virus-free leaves; those given prior or subsequent access to BMV also transmitted PVY° less frequently. However, prior or subsequent access to PVY° did not decrease transmission of either BMV or PVYN, and access to BMV did not decrease transmission of PVYN. Access to the non-aphid-transmissible TMV did not affect transmission of either PVY° or PVYN. PVYN had the greatest electrophoretic mobility. BMV was least mobile and PVY° was intermediate, so ability to decrease transmission was not directly related to the total anionic charge on the virus particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1986.tb01998.x
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  • 8
    Electronic Resource
    Electronic Resource
    The Role of Pulmonary Surfactant in SIDS (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 533 (1988), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1988.tb37258.x
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  • 9
    Electronic Resource
    Electronic Resource
    Development, morphometry and particle retention capability of the gill rakers in the herring, Clupea harengus L. (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 32 (1988), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The development of gill rakers in the herring, Clupea harengus L. was followed from the larva to the adult. The first rakers appear on the gill arches at a total length (t.l.) of about 16 mm. Their number then increases rapidly until the fish are about 50 mm t.l. when the rate of addition becomes much slower. The length of individual rakers and the space between them continues to increase throughout life. The rakers on the first gill arch account for almost 60% of the whole filtering area. The observed particle retention capabilities of the fish when filter-feeding were lower than those expected on the basis of the estimated spaces between the rakers. Several reasons are suggested for the discrepancy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1988.tb05438.x
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  • 10
    Electronic Resource
    Electronic Resource
    Internal material damping of polymer matrix composites under off-axis loading (1985)
    Springer
    Journal of materials science 20 (1985), S. 2575-2585 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The objective of this paper is to determine theoretically the material damping of short fibre-reinforced polymer matrix composites. The major damping mechanism in such composites is the viscoelastic behaviour of the polymer matrix. The analysis was carried out by developing a finite-element program which is capable of evaluating the stress and strain distribution of short fibre composites under axial loading (see Fig. 1a). Using the concept of balance of force we can express the modulusE x along the loading direction as a function of the mechanical properties of the fibre and matrix materials, fibre aspect ratio,l/d, loading angle,θ, and fibre volume fraction,V f. Then we apply the elastic-viscoelastic correspondence principle to replace all the mechanical properties of the composite, fibre and matrix materials such asE x,E f,E m,G m, by the corresponding complex moduli such asE x ′ +iE x ″ , andE f ′ +iE f ″ . After separation of the real and imaginary parts, we can expressE ' x/t' andE x t" as functions of the fibre aspect ratio,l/d, loading angle,θ, stiffness ratio,E f/E m, fibre volume fraction,V f, and damping properties of the fibre and matrix materials such asη f andη m. Numerical results of the composite storage modulus,E x ′ , loss modulus,E x ″ , and loss factor (damping),η C, are plotted as functions of parameters such asl/d,θ,V f, and are discussed in terms of variations ofl/d,θ, andE f/E m, in detail. It is observed that for a given composite, there exist optimum values ofl/d andθ at whichE x ″ andη c are maximized. The results of this paper can be used to optimize the performance of composite structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00556089
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