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  • Springer  (11)
  • Wiley  (9)
  • American Chemical Society  (8)
  • American Physical Society (APS)
  • 1995-1999  (28)
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Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Total Synthesis of (+)-Dactylol via a Novel [3 + 5] Annulation Approach (1995)
    s.l. : American Chemical Society
    The @journal of organic chemistry 60 (1995), S. 4559-4565 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00119a038
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  • 2
    Electronic Resource
    Electronic Resource
    [3 + 4] and [3 + 5] Annulation Reactions of .alpha.-(Phenylthio)Dicarbonyl Electrophiles with Bis(trimethylsilyl) Enol Ethers: Synthesis of Highly Functionalized Medium Ring Carbocycles (1995)
    s.l. : American Chemical Society
    The @journal of organic chemistry 60 (1995), S. 8382-8393 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00131a013
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  • 3
    Electronic Resource
    Electronic Resource
    Cell membrane effects of some common biocides (1998)
    Springer
    Journal of industrial microbiology and biotechnology 21 (1998), S. 6-10 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: cytoplasmic membrane; biocides; potassium leakage; Escherichia coli; Pseudomonas aeruginosa; Pseudomonas-gap
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Many antimicrobial compounds exhibit bacterial cell membrane activity as either potassium ion leakage and/or leakage of material that absorbs at 260 nm from the cell. In this experiment a potassium ion selective electrode and spectophotometric observation of 260-nm leakage were used in order to examine cell membrane effects in a selection of common biocides upon both Escherichia coli NCIMB 10000 and Pseudomonas aeruginosa NCIMB 10548. The observation of potassium ion leakage for pyrithione biocides yielded results which were initially difficult to interpret, but are thought to suggest a species-dependent combination of potassium ion leakage from affected membranes and chelation of those leaked ions in the bathing suspension. Such a result is not, however, supported by the 260-nm material leakage results, which indicate very similar levels of membrane active effects for both species of bacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.2900554
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  • 4
    Electronic Resource
    Electronic Resource
    Behavioral responses of three species of ground beetle (Coleoptera: Carabidae) to olfactory cues associated with prey and habitat (1996)
    Springer
    Journal of insect behavior 9 (1996), S. 237-250 
    Details
    ISSN: 1572-8889
    Keywords: olfactometer ; kairomone ; (E)-β-farnesene ; carabids ; aphids ; pest management
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The responses ofPterostichus melanarius Illiger,Harpalus rufipes DeGeer, andNebria brevicollis Fabricius (Coleoptera: Carabidae) to olfactory cues of prey and habitat were studied in a four-arm continuous-airflow olfactometer. The process was semiautomated using time-lapse image analysis by microcomputer. The primary constituent of the aphid alarm pheromone, (E)-β-farnesene (EBF), was synthesized and tested for a kairomonal role in prey detection by carabids. In addition, individual beetles were exposed to odors from live aphids, live collembolans, and a crude extract of wheat. All three beetle species showed evidence of olfaction.P. melanarius responded to all the odors except collembolans,H. rufipes responded to EBF and wheat, andN. brevicollis to collembolans. The use of a defence allomone as a prey-finding kairomone by certain carabid species has implications for pest management. Manipulation of predator chemical ecology by the inclusion of behavior-modifying compounds in a crop spray mix with reduced amounts of insecticide may allow for efficient aphid control with less environmental contamination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02213868
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  • 5
    Electronic Resource
    Electronic Resource
    Zero-energy Fields on Real Projective Space (1997)
    Springer
    Geometriae dedicata 67 (1997), S. 245-258 
    Details
    ISSN: 1572-9168
    Keywords: Integral geometry ; involutive structure ; Randon transform ; cohomology.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A smooth 1-form on real projective space with vanishing integral along all geodesics is said to have zero energy. Such a 1-form is necessarily the exterior derivative of a smooth function. We formulate a general version of this theorem for tensor fields on real projective space and prove it using methods of complex analysis. A key ingredient is the cohomology of involutive structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004939917121
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  • 6
    Electronic Resource
    Electronic Resource
    On Affine Normal Forms and a Classification of Homogeneous Surfaces in Affine Three-Space (1999)
    Springer
    Geometriae dedicata 77 (1999), S. 11-69 
    Details
    ISSN: 1572-9168
    Keywords: affine ; homogeneous ; surface ; classification ; normal form.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We classify homogeneous surfaces in real and complex affine three-space. This is achieved by choosing affine coordinates so that the surface is defined by a function whose Taylor series is in a preferred normal form.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005083518793
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  • 7
    Electronic Resource
    Electronic Resource
    Injection-induced Microseismicity in Colorado Shales (1998)
    Springer
    Pure and applied geophysics 153 (1998), S. 95-111 
    Details
    ISSN: 1420-9136
    Keywords: Key words: Water injection, microseismicity, source location, P- and S-wave velocity, attenuation, polarization.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —Imperial Oil Resources Limited uses cyclic steam stimulation to recover oil from their Cold Lake oil field in Alberta. This operation, in particular situations, can be associated with the failure of well casings in the Colorado shales above the oil-bearing formation. A number of fluid injection operations was undertaken at this site and the associated microseismicity was detected using two three-component geophones and fifteen hydrophones. The purpose of this experiment was to simulate the occurrence of a casing failure, determine the feasibility of monitoring in a shallow environment, and characterize the microseismic activity. A calibration survey provided values of 1786 ± 108 m/s for P-wave velocity, 643 ± 56 m/s for S-wave velocity and 0.428 ± 0.017 for Poisson’s ratio in the shale formation. Estimates of the quality factor Q P were 15 for the horizontal direction and 38 for the vertical direction, corroborating the evidence of velocity anisotropy. Calibration shots were located to within 10 m of the actual shot points using triangulation and polarization techniques. Several hundred microseis mic events were recorded and 135 events were located. The results showed that microseismic activity was confined to depths within 10 meters of the injection depth. The experiment clearly established the feasibility of detecting microseismicity induced by fluid injection rates typical of casing failures in shales at distances over 100 m.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050186
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  • 8
    Electronic Resource
    Electronic Resource
    Electrochemical oxidation of a carbon black loaded polymer electrode in aqueous electrolytes (1999)
    Springer
    Journal of solid state electrochemistry 3 (1999), S. 179-186 
    Details
    ISSN: 1433-0768
    Keywords: Key words Cathodic protection system ; Carbon ; oxidation ; Composite carbon/polymer anode ; Lifetime
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The suitability of a polymeric composite material for use as part of an anode structure in a cathodic protection system has been examined. The composite material was a conductive blend (volume resistivity typically 1.5 Ω cm) of carbon black in a polyethylene binder. A long operational lifetime for the material demands that the rate of carbon loss must be low. In the work reported here, electrochemical and in situ analytical techniques were employed to characterise the performance of the material over a wide range of anodic current densities in a variety of aqueous electrolytes. The predominant anodic electrochemical reaction on the polymeric material is CO2 formation in acid and neutral solutions, which causes loss of carbon from the surface and the development of a non-conducting layer of polyethylene. The characteristics of the reaction suggest that it occurs via the discharge of H2O. In alkaline pH, however, the anodic reactions are more complex. A high OH− concentration (pH 12 or higher) favours the formation of oxygen rather than CO2, particularly at low anodic potentials. The presence of CO3 2− in the electrolyte catalyses the evolution of oxygen at pH values as low as 9. The electrochemical formation of oxygen always occurs in parallel with the generation of some humic acid in the solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100080050145
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  • 9
    Electronic Resource
    Electronic Resource
    Introduction (1998)
    Springer
    Journal of fluorescence 8 (1998), S. 281-281 
    Details
    ISSN: 1573-4994
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020504011170
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  • 10
    Electronic Resource
    Electronic Resource
    Correspondence between Ontogenetic Shifts in Morphology and Habitat Use in Minnow Phoxinus Phoxinus (1999)
    Springer
    Environmental biology of fishes 56 (1999), S. 117-128 
    Details
    ISSN: 1573-5133
    Keywords: developmental shifts ; habitat use ; mensural characters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The morphology of minnows Phoxinus phoxinus from two rivers at the south-east of England was analysed on mensural characters and qualitative traits (occurrence of appendages, pattern of pigmentation and scalation). Eight developmental intervals were identified from the qualitative traits, and bivariate and multivariate analysis revealed that allometric growth occurs occasionally during ontogeny, mainly in earlier developmental periods. Body shape is under the influence of rapid increase during development, mainly due to the quick growth in early developmental intervals. The exclusion of ‘general size’, remarkable in early developmental intervals, revealed several ‘shape’ characters that mainly determine minnow morphology by changing the mode of variability during development (e.g. caudal characters, maximum body height, belly length and ventral head length). The tail certainly undergoes the most consistent and most durable change, its characters being the most variable and the most discriminative for developmental periods from larvae to adults. The most prominent alteration in the overall shape development occurs at the transition from larva to juvenile, both regarding the number of characters involved into the change and their variability. This transition takes place at about 28 mm SL, which corresponds to a significant change in microhabitat use in both the rivers Lee and Frome, characterized by shifts by 0+ juveniles to significantly deeper waters than those occupied by larvae, with increased amounts of either submerged filamentous algae (Lee) or vegetation (Frome).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007541915307
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