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  • Articles  (46)
  • Springer  (28)
  • Institute of Physics  (9)
  • Oxford University Press  (4)
  • American Institute of Physics  (3)
  • Blackwell Publishing Ltd  (2)
  • Geological Society of America (GSA)
  • 2005-2009
  • 2000-2004  (20)
  • 1995-1999  (26)
  • 2004  (20)
  • 1996  (26)
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  • Articles  (46)
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  • 2005-2009
  • 2000-2004  (20)
  • 1995-1999  (26)
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  • 1
    Electronic Resource
    Electronic Resource
    Effects of ammonium ions on the depolarization-induced and direct activation of the contractile apparatus in mechanically skinned fast-twitch skeletal muscle fibres of the rat (1996)
    Springer
    Journal of muscle research and cell motility 17 (1996), S. 611-616 
    Details
    ISSN: 1573-2657
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Mechanically skinned fibre preparations from the extensor digitorum longus muscle of the rat were used to test whether a rise in myoplasmic [NH4 +] in the range 2–10 mm interferes with the mechanism of excitation-contraction coupling in fast-twitch mammalian muscle. Under our conditions (pH 7.10, Mg2+ 1 mm, temperature 23° C), [NH4 +] up to 10 mm had little effect on the Ca+-activated force and on the peak of the t-system depolarization-induced force response. However, the duration of the depolarization-induced force response was decreased significantly at [NH4 +] ≥2 mm. From these data we conclude that the intracellular accumulation of NH4 + is not likely to play a major role in fatigue. Nevertheless, the build up of NH4 + during fatigue, may have a significant inhibitory effect on the force output by decreasing the duration of the t-system depolarization-induced activation of the contractile apparatus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00154055
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  • 2
    Electronic Resource
    Electronic Resource
    Genetic and environmental effects on glucosinolate content and chemoprotective potency of broccoli (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 123 (2004), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Broccoli is well recognized as a source of glucosinolates and their isothiocyanate breakdown products. Glucoraphanin is one of the most abundant glucosinolates present in broccoli and its cognate isothiocyanate is sulphoraphane, a potent inducer of mammalian detoxication (phase 2) enzyme activity and anti-cancer agent. This study was designed to measure: glucosinolate levels in broccoli florets from an array of genotypes grown in several environments; the elevation of a key phase 2 enzyme, quinone reductase, in mammalian cells exposed to floret extracts; and total broccoli head content. There were significant environmental and genotype-by-environment effects on levels of glucoraphanin and quinone reductase induction potential of broccoli heads; however, the effect of genotype was greater than that of environmental factors. The relative rankings among genotypes for glucoraphanin and quinone reductase induction potential changed, when expressed on a per head basis, rather than on a concentration basis. Correlations of trait means in one environment vs. means from a second were stronger for glucoraphanin and quinone reductase induction potential on a per head basis than on a fresh weight concentration basis. Results of this study indicate that development of a broccoli phenotype with a dense head and a high concentration of glucoraphanin to deliver maximum chemoprotective potential (high enzyme induction potential/glucoraphanin content) is a feasible goal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.0179-9541.2003.00912.x
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  • 3
    Electronic Resource
    Electronic Resource
    Towards a quantitative description of field-impressed anisotropy of susceptibility (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 126 (1996), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: A simplified model of domain rearrangement in multidomain particles following the application of an alternating (AF) or direct (DF) field is used to quantify the dependence of anisotropy of magnetic susceptibility on magnetic history. To be able to account for changes in the average susceptibility (i.e. The average of three mutually perpendicular susceptibility measurements) of the sample following field treatment, the model has to be refined by introducing interaction between domains. By fitting theoretical curves of anisotropy versus peak AF to experimental results for samples containing different size fractions of magnetite particles, of average grain size ranging from 0.7 to 58 μm, four relevant parameters can be computed (for each sample), which enables a good fit to be obtained. By allowing two of these parameters to change systematically when a DF is applied (and an IRM is acquired), the anisotropy dependence on direct field strength can also be modelled. This includes the sign change observed as the field-impressed ellipsoid changes from prolate to oblate, together with increases in the average susceptibility as the field increases. However, some details, such as discrepancies between predicted and actual increases in the average susceptibility at high fields, suggest that further refinement of the model is required.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1996.tb05306.x
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  • 4
    Electronic Resource
    Electronic Resource
    Coring artifacts and contaminant inventories in lake sediment (1996)
    Springer
    Journal of paleolimnology 15 (1996), S. 99-106 
    Details
    ISSN: 1573-0417
    Keywords: lake sediments ; gravity core ; freeze core ; coring artifacts ; contaminant concentration ; contaminant inventory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Sediments of Lake 382, Experimental Lakes Area, Canada, were sampled at six sites using a 5-cm Wildco KB core sampler (KB), a similar device incorporating a ball check valve (BC), and a 0.2 m by 1.2 m flat-faced aluminum freeze core sampler (FC). Cores were sectioned at 1-cm intervals to a depth of 15 cm. Contaminant (210Pb and 137Cs) concentrations (Bq g-1) were measured by gamma spectroscopy, and inventories (Bq cm-2) were calculated following standard methods. Sediments collected using FC, BC and KB had similar contaminant concentrations, however, cores collected by FC and BC had lower estimated inventories than KB cores. Differences between estimates appear to be caused by differences in the water content (WC) of core material. Laboratory studies confirm that FC sediments have higher WC than tube-cored sediment. We hypothesize that ice crystal formation increases the WC of freeze cores, resulting in lower contaminant inventories. Loss of surficial sediment caused by a ‘bow wave’ may have a similar effect on BC samples. We conclude that KB core gear is appropriate for sampling sediments to measure contaminant concentrations and inventories in recently deposited sediments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00176992
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  • 5
    Electronic Resource
    Electronic Resource
    UV spectroscopy of metal volatilization during thermal plasma processing of waste glass melts (1996)
    Springer
    Plasma chemistry and plasma processing 16 (1996), S. 449-460 
    Details
    ISSN: 1572-8986
    Keywords: Spectroscopy ; volatilization ; iron ; nickel ; chromium ; waste vitrification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Technology
    Notes: Abstract Atomic emission spectroscopy (AES) is used to monitor volatilization during waste vitrification with thermal plasmas. Model baste specimens consist of am alumino-silicate clay spiked with 10 wt. % Fe, Ni, or Cr. Specimens are vitrified in processing atmospheres with 0, 8.5, and 17 vol. % oxygen/argon concentrations. Particulate generated from condensation of the volatilized materials is collected following each specimen run and analyzed by energy dispersive X-ray analysis to determine composition. Spectra are collected from the ultraviolet range 240–380 nm in where the presence of metal vapor is readily detected. Correlation between line emission intensities and volatilization rates allows the establishment of provisional detection limits for the volatilization of Ni, Cr, Si, and Fe, of 1 × 103 g/s, 4 × 104 g/s, 2 × 104 g/s, and 5 × 105 g/s, respectively. The results of this investigation support the concept of using AES as an in-situ process monitor for feedback to optimize plasma processing of hazardous metal-containing waste.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01447155
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  • 6
    Electronic Resource
    Electronic Resource
    Metal co-injection moulding (1996)
    Springer
    Journal of materials science 15 (1996), S. 2033-2035 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00278613
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of pollen selection on progeny vigor in a Cucurbita pepo × C. texana hybrid (1996)
    Springer
    Theoretical and applied genetics 92 (1996), S. 885-890 
    Details
    ISSN: 1432-2242
    Keywords: Key words  Microgametophyte selection ; Pollen selection ; Pollen competition ; Cucurbita texana ; Cucurbita pepo
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract   We examined the effects of pollen selection for rapid pollen-tube growth on progeny vigor. First, we crossed a wild gourd (Cucurbita texana) to a cultivated zucchini (Cucurbita pepo cv `Black Beauty') to produce an F1 and then an F2 generation. Half of the F1 seeds were produced by depositing small loads of C. texana pollen onto the stigmas of C. pepo. These small pollen loads were insufficient to produce a full complement of seeds and, consequently, both the fast- and the slow-growing pollen tubes were permitted to achieve fertilization. An F2 generation was then produced by depositing small loads of F1 pollen onto stigmas of F1 plants. The F2 seeds resulting from two generations of small pollen loads are termed 'the non-selected line' because there was little or no selection for pollen-tube growth rate on these plants. The other half of the F1 and F2 seeds were produced by depositing large pollen loads (〉10000 pollen grains) onto stigmas and then allowing only the first 1% or so of the pollen tubes that entered the ovary to fertilize the ovules. We did this by excising the styles at the ovary at 12–15 h after pollination. The resulting F2 seeds are termed `the selected line' because they were produced by two generations of selection for only the fastest growing pollen tubes. Small pollen loads from the F2 plants, both the selected and the non-selected lines, were then deposited onto stigmas of different C. pepo flowers, and the vigor of the resulting seeds was compared under greenhouse and field conditions. The results showed that the seeds fertilized by pollen from the selected line had greater vegetative vigor as seedlings and greater flower and fruit production as mature plants than the seeds fertilized by pollen from the non-selected line. This study demonstrates that selection for fast pollen-tube growth (selection on the microgametophyte) leads to a correlated increase in sporophyte (progeny) vigor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220050207
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  • 8
    Electronic Resource
    Electronic Resource
    Effects of pollen selection on progeny vigor in a Cucurbita pepo x C. texana hybrid (1996)
    Springer
    Theoretical and applied genetics 92 (1996), S. 885-890 
    Details
    ISSN: 1432-2242
    Keywords: Microgametophyte selection ; Pollen selection ; Pollen competition ; Cucurbita texana ; Cucurbita pepo
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We examined the effects of pollen selection for rapid pollen-tube growth on progeny vigor. First, we crossed a wild gourd (Cucurbita texana) to a cultivated zucchini (Cucurbita pepo cv ‘Black Beauty’) to produce an F1 and then an F2 generation. Half of the F1 seeds were produced by depositing small loads of C. texana pollen onto the stigmas of C. pepo. These small pollen loads were insufficient to produce a full complement of seeds and, consequently, both the fast- and the slow-growing pollen tubes were permitted to achieve fertilization. An F2 generation was then produced by depositing small loads of F1 pollen onto stigmas of F1 plants. The F2 seeds resulting from two generations of small pollen loads are termed the non-selected line because there was little or no selection for pollen-tube growth rate on these plants. The other half of the F1 and F2 seeds were produced by depositing large pollen loads (〉10 000 pollen grains) onto stigmas and then allowing only the first 1% or so of the pollen tubes that entered the ovary to fertilize the ovules. We did this by excising the styles at the ovary at 12–15 h after pollination. The resulting F2 seeds are termed ‘the selected line’ because they were produced by two generations of selection for only the fastest growing pollen tubes. Small pollen loads from the F2plants, both the selected and the non-selected lines, were then deposited onto stigmas of different C. pepo flowers, and the vigor of the resulting seeds was compared under greenhouse and field conditions. The results showed that the seeds fertilized by pollen from the selected line had greater vegetative vigor as seedlings and greater flower and fruit production as mature plants than the seeds fertilized by pollen from the non-selected line. This study demonstrates that selection for fast pollen-tube growth (selection on the microgametophyte) leads to a correlated increase in sporophyte (progeny) vigor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221902
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  • 9
    Electronic Resource
    Electronic Resource
    Comparison of five media for the axenic culture of Myriophyllum sibiricum Komarov (1996)
    Springer
    Hydrobiologia 340 (1996), S. 17-22 
    Details
    ISSN: 1573-5117
    Keywords: aquatic plant media ; Myriophyllum sibiricum ; axenic culture ; pesticide bioassay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Myriophyllum sibiricum Komarov, an aquatic dicotyledonous macrophyte with a north temperate distribution, was assessed for use in a new bioassay to determine the effect of pesticides, agricultural runoff and municipal waste upon non-target aquatic macrophytes. An axenic culturing system was developed for which an optimal growth medium is required before a bioassay will be reliable. Five media (Murashige and Skoog, Hoagland's, Gaudet's, modified Andrew's, and Hard Water media), commonly used for aquatic plant culturing, were compared to determine the effect on M. sibiricum growth and development. Morphological endpoints for the assay included shoot length, total root length and number, fresh weight and plant area. Membrane integrity, chlorophyll a, chlorophyll b and carotenoid content were the physiological endpoints examined. Based upon these criteria, the modified Andrew's medium at a pH of 5.8, without the addition of a buffer was chosen as a medium which supported rapid and consistent development of M. sibiricum during the two week assay period.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00012728
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  • 10
    Electronic Resource
    Electronic Resource
    Insider trading during bankruptcy: Do insiders trade on private knowledge? (1996)
    Springer
    International advances in economic research 2 (1996), S. 196-196 
    Details
    ISSN: 1573-966X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02295064
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