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  • 1
    Electronic Resource
    Electronic Resource
    Filter-Feeding Ecology of Aquatic Insects (1980)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Entomology 25 (1980), S. 103-132 
    Details
    ISSN: 0066-4170
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.en.25.010180.000535
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetically induced texturing during the sintering of strontium hexaferrite (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5935-5935 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The hexaferrite SrO⋅6Fe2O3 exhibits pronounced ferrimagnetic anisotropy at room temperature, with the direction of easy magnetization lying parallel to the c axis of its hexagonal crystal structure.1–3 This magnetic anisotropy is used to produce highly aligned permanent magnets, by the application of a magnetic field during processing at room temperature. Since this material exhibits paramagnetic anisotropy at temperatures above 470 °C, it is possible that preferred orientation textures can be produced when samples of various shapes are sintered in a magnetic field4 at temperatures between 1150 and 1250 °C. The crystal structure, texture and microstructure of samples of strontium hexaferrite prepared in this manner have been determined by x-ray diffractometry and scanning electron microscopy. The significance of the observed textures is evaluated in terms of the anisotropy of the room temperature ferrimagnetic properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353526
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  • 3
    Electronic Resource
    Electronic Resource
    Stream macroinvertebrate response to catchment urbanisation (Georgia, U.S.A.) (2003)
    Oxford, UK : Blackwell Science Ltd
    Freshwater biology 48 (2003), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY 1. The effects of catchment urbanisation on water quality were examined for 30 streams (stratified into 15, 50 and 100 km2 ± 25% catchments) in the Etowah River basin, Georgia, U.S.A. We examined relationships between land cover (implying cover and use) in these catchments (e.g. urban, forest and agriculture) and macroinvertebrate assemblage attributes using several previously published indices to summarise macroinvertebrate response. Based on a priori predictions as to mechanisms of biotic impairment under changing land cover, additional measurements were made to assess geomorphology, hydrology and chemistry in each stream.2. We found strong relationships between catchment land cover and stream biota. Taxon richness and other biotic indices that reflected good water quality were negatively related to urban land cover and positively related to forest land cover. Urban land cover alone explained 29–38% of the variation in some macroinvertebrate indices. Reduced water quality was detectable at c. 〉15% urban land cover.3. Urban land cover correlated with a number of geomorphic variables such as stream bed sediment size (–) and total suspended solids (+) as well as a number of water chemistry variables including nitrogen and phosphorus concentrations (+), specific conductance (+) and turbidity (+). Biotic indices were better predicted by these reach scale variables than single, catchment scale land cover variables. Multiple regression models explained 69% of variation in total taxon richness and 78% of the variation in the Invertebrate Community Index (ICI) using phi variability, specific conductance and depth, and riffle phi, specific conductance and phi variability, respectively.4. Indirect ordination analysis was used to describe assemblage and functional group changes among sites and corroborate which environmental variables were most important in driving differences in macroinvertebrate assemblages. The first axis in a non-metric multidimensional scaling ordination was highly related to environmental variables (slope, specific conductance, phi variability; adj. R2=0.83) that were also important in our multiple regression models.5. Catchment urbanisation resulted in less diverse and more tolerant stream macroinvertebrate assemblages via increased sediment transport, reduced stream bed sediment size and increased solutes. The biotic indices that were most sensitive to environmental variation were taxon richness, EPT richness and the ICI. Our results were largely consistent over the range in basin size we tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.2003.00979.x
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  • 4
    Electronic Resource
    Electronic Resource
    The magnetization of superconducting La1.85Sr0.15Cu1−xVxO4−∂ : 35th annual conference on magnetism and magnetic materials (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 4857-4859 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Oxides of the type La1.85Sr0.15Cu1−xVxO4−∂ were prepared with vanadium contents, x, ranging from 0 to 0.10 in increments of 0.01. Vanadium entered into solid solution in the tetragonal K-phase structure at concentrations up to x=0.05. Further additions of vanadium resulted in the formation of SrV5O11 and an orthorhombic distortion of the K-phase structure. An increase in the irreversibility of the magnetization at 4.2 K, at a vanadium concentration of x=0.01, was attributed to increased flux pinning due to solid solution hardening. Reduced magnetic irreversibilities and critical temperatures were observed at higher vanadium concentrations, and attributed to a loss of strontium from the K phase due to the formation of SrV5O11.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348203
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  • 5
    Electronic Resource
    Electronic Resource
    The Role of Macroinvertebrates in Stream Ecosystem Function (1996)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Entomology 41 (1996), S. 115-139 
    Details
    ISSN: 0066-4170
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.en.41.010196.000555
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  • 6
    Electronic Resource
    Electronic Resource
    Colonization of a headwater stream during three years of seasonal insecticidal applications (1991)
    Springer
    Hydrobiologia 211 (1991), S. 65-76 
    Details
    ISSN: 1573-5117
    Keywords: insecticide ; disturbance ; stream ; insects ; life cycles ; colonization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We investigated recolonization by insects of a small headwater stream in the southern Appalachian Mountains that was treated along its entire length with an insecticide (methoxychlor). Initial treatment (December 1985) resulted in massive insect drift. Applications continued seasonally for three years, and drift was measured during each treatment. Taxonomic composition of the drift indicated several responses: (1) Some taxa were eliminated. (2) A number of taxa occurred only sporadically following initial treatment. (3) Early instars for some taxa showed seasonal occurrences which closely paralleled known life cycles and flight periods of adults. Groups which provided strong evidence for aerial recolonization included several Ephemeroptera, Plecoptera (Peltoperlidae and Isoperla spp.), and Trichoptera (Parapsyche cardis, Diplectrona modesta, Pycnopsyche spp., and Lepidostoma spp.). (4) Some long-lived taxa survived and exhibited distinct growth through several treatment periods. These include Odonata (Lanthus and Cordulegaster), some Ephemeroptera, and some Diptera (Tipulidae, Ceratopogonidae, and Tanypodinae). (5) Some taxa which were not present at the time of initial treatment appeared during the experiment. Chironomidae dominated the drift in all samples, and the number of genera did not decrease during the three-year treatment period. Of the 27 chironomid genera identified, only Micropsectra decreased in proportional abundance during treatment. In contrast, several genera (Corynoneura, Meropelopia, Parametriocnemus, and Tvetnia) showed little change in relative abundance. Larsia (Tanypodinae) increased in proportional abundance during the treatment period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00008618
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  • 7
    Electronic Resource
    Electronic Resource
    Chemistry of the defensive secretion of the caddisflyPycnopsyche scabripennis (Trichoptera: Limnephilidae) (1977)
    Springer
    Journal of chemical ecology 3 (1977), S. 649-656 
    Details
    ISSN: 1573-1561
    Keywords: Pycnopsyche scabripennis ; caddisfly ; defensive secretion ; exocrine gland ; indole ; p-cresol ; skatole
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract From a pair of exocrine glands located on the fifth abdominal sternite, the caddisflyPycnopsyche scabripennis secretes a defensive exudate which containsp-cresol, indole, and skatole. This secretion effectively repels invertebrate predators such as ants. The probable significance of this secretion in the biology of these caddisflies is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00988064
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  • 8
    Electronic Resource
    Electronic Resource
    Chrysomelidial in the defensive secretion of the leaf beetleGastrophysa cyanea Melsheimer (1978)
    Springer
    Journal of chemical ecology 4 (1978), S. 47-53 
    Details
    ISSN: 1573-1561
    Keywords: chrysomelidae ; chrysomelidial ; Gastrophysa cyanea ; defensive secretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Larvae of the chrysomelid beetleGastrophysa cyanea produce a defensive secretion in their eversible thoracic and abdominal glands that is an effective repellent for small predators such as fire ants. This secretion is composed primarily of chrysomelidial, 2-(2-formyl-3-methyl-2-cyclopentenyl)propanal, and a compound tentatively identified as its enol lactone. Adaptations that optimize the effectiveness of the larval defensive exudate are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00988259
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  • 9
    Electronic Resource
    Electronic Resource
    A novel technique for measuring solute diffusivities in entrapment matrices used in immobilization (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 30 (1987), S. 936-945 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A novel technique has been developed for measuring effective solute diffusivities in entrapment matrices used for cell immobilization. In this technique radiotracers were used to measure effective diffusivities and equilibrium partition coefficients of the solute between the liquid and solid matrix. Ca-alginate was used in this study, because it is one of the most commonly employed matrices for the immobilization of microbial, plant and mammalian cells. The experimental apparatus consisted of a single spherical Ca-alginate bead which was attached to a rotating rod and immersed in water containing C14-glucose. The rotational speed of the spherical bead was controlled and resulted in excellent mixing, and negligible external film mass transfer resistance, which allowed the measurement of true effective solute diffusivity within the solid matrix. The rates of C14-glucose diffusion within the Ca-alginate sphere were measured using a scintillation spectrometer. A mathematical model of unsteady-state diffusion in a sphere was used with appropriate boundary conditions, and the effective diffusivity of glucose was found from the best fit of the experimental data using a computer regression analysis method. Using 2% (w/v) Ca-alginate beads in this new radiotracer technique the effective diffusivity and partition coefficient of glucose were found to be 6.62 × 10-10 m2/s and 0.98, respectively. The accuracy, advantages, and simplicity of this new method for diffusivity measurements are also compared to other existing methods.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260300804
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  • 10
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    Radiation defect dynamics in Si at room temperature studied by pulsed ion beams (2015)
    American Institute of Physics
    Details
    Publication Date: 2015-10-07
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics
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