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  • Articles  (87)
  • Springer  (75)
  • American Association for the Advancement of Science  (12)
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  • Articles  (87)
Journal
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Risk analysis 19 (1999), S. 283-294 
    ISSN: 1539-6924
    Keywords: Risk perception ; pesticides ; pest management ; health effects ; agricultural pollution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Water pollution from agricultural pesticides continues to be a public concern. Given that the use of such pesticides on the farm is largely governed by voluntary behavior, it is important to understand what drives farmer behavior. Health belief models in public health and social psychology argue that persons who have adverse health experiences are likely to undertake preventive behavior. An analogous hypothesis set was tested here: farmers who believe they have had adverse health experiences from pesticides are likely to have heightened concerns about pesticides and are more likely to take greater precautions in dealing with pesticides. This work is based on an original survey of a population of 2700 corn and soybean growers in Maryland, New York, and Pennsylvania using the U.S. Department of Agriculture data base. It was designed as a mail survey with telephone follow-up, and resulted in a 60 percent response rate. Farm operators report experiencing adverse health problems they believe are associated with pesticides that is equivalent to an incidence rate that is higher than the reported incidence of occupational pesticide poisonings, but similar to the reported incidence of all pesticide poisonings. Farmers who report experiencing such problems have more heightened concerns about water pollution from fertilizers and pesticides, and illness and injury from mixing, loading, and applying pesticides than farmers who have not experienced such problems. Farmers who report experiencing such problems also are more likely to report using alternative pest management practices than farmers who do not report having such problems. This implies that farmers who have had such experiences do care about the effects of application and do engage in alternative means of pest management, which at least involve the reduction in pesticide use.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 61 (1994), S. 425-431 
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The phenomenology of the pseudoscalar η(1440) meson (also known as l) is discussed in a simplified η, η′ l mixing scheme in which the η is assumed to have no glueball component. The parameters of the model are quite well constrained from the η and η′ two-photon decays. First it is shown that the scheme is in rather good general agreement with (almost) all the available data. Then a number of testable predictions concerning decays involving the iota are made. The iota turns out to be largely a glueball in this model.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract K-shell ionization cross sections in collisions of S and Cl ions with target atoms with atomic numberZ 2=11–22 have been measured in the energy range from 3.9 to 48 MeV. The data are interpreted in terms of the statistical model of electron diffusion to the continuum. The distribution ofK-vacancies between the projectile and the target atoms are discussed in the framework of the vacancy sharing process.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 40 (1988), S. 357-363 
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss the ordering of energy levels of bound states of various relativistic wave equations with local potentials. We concentrate on wave equations for two spinless particles. We point out differences and similarities to the case of the nonrelativistic Schrödinger equation.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of regulatory economics 3 (1991), S. 241-249 
    ISSN: 1573-0468
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract To properly assess the performance and monitor the management of industrially diversified firms, investors and other stakeholders may want companies to report separate financial data for each of their lines of business. In the mid-1970s, following a major increase in diversification of American firms, private and public regulators began requiring firms to disclose financial data for individual industry segments. Company managers, however, were given the authority to determine the degree to which data reported to outsiders was disaggregated. This article examines the managerial response to segmented financial disclosure regulations. Analysis of longitudinal data reveals that the extent of segmentation in reporting has been both low and declining, relative to the true extent of industrial diversification. In 1985, the fraction of companies with more than one reported segment was only 29.7 percent, whereas the fraction of companies operating in more than one line of business (assigned more than one SIC code by Compustat) was 83.5 percent. In 1977, about half of the included companies reported at least two industry segments, and a third reported at least three; by 1987, these fractions had declined to about one-quarter and one-seventh, respectively. A potential explanation of these findings is that managers perceive minimal disclosure of segmented information to be in their own self-interest.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Foundations of physics 26 (1996), S. 1105-1107 
    ISSN: 1572-9516
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    The journal of membrane biology 152 (1996), S. 169-181 
    ISSN: 1432-1424
    Keywords: Key words: K+ uptake system — Genetic complementation — Transport kinetics — Patch-clamp analysis — Ion-selectivity —Schizosaccharomyces pombe
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract. Complementary DNAs involved in potassium transport in Schizosaccharomyces pombe were selected by complementation of defective K+ uptake in a trk1 trk2 mutant of Saccharomyces cerevisiae. Here we describe the SpTRK gene that encodes a protein of 833 amino acids. The predicted structure contains 12 putative membrane-spanning domains and resembles various high- and low-affinity systems for K+ transport in yeasts and plants. TKHp, the product of SpTRK exhibits high homology to TRK1 and TRK2 of Saccharomyces cerevisiae as well as to HKT1 of Triticum aestivum, but is not related to HAK1 of another ascomycete, Schwanniomyces occidentalis, suggesting that different routes for potassium uptake evolved independently. This protein is a potassium-specific transporter since functional analysis of the SpTRK complemented mutant strain of Sacch. cerevisiae revealed potassium transport affinities and uptake characteristics similar to those obtained in wild-type Sch. pombe. Patch-clamp analysis in the whole-cell mode confirmed the TKHp-mediated inward current in the complemented strain. The inward current increased by acidification of the extracellular medium thereby suggesting a mechanism of K+H+ cotransport. The inward current is not detectable when external K+ is substituted by Na+, documenting a distinct cation specificity of the protein.
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  • 8
    ISSN: 1432-1424
    Keywords: electrical potential difference (Δψ) ; membrane potential ; yeast electrophysiology ; microelectrode ; TPP+ distribution ; Pichia humboldtii
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Electrical potential differences across the plasma membrane (Δψ) of the yeastPichia humboldtii were measured with microelectrodes (filled with 0.1m KCl) inserted into cells immobilized in microfunnels. The registered Δψ signals were reproducible and stable for several minutes. On attainment of stable reading for Δψ the specific membrane resistanceR sp was determined by applying square-current pulses to the preparation. Both Δψ andR sp were pH dependent and displayed equal but opposite deflection, Δψ reaching its maximal value of −88±9 mV (n=13) andR sp its minimal value of 10 kΩ·cm2 (maximal conductance) at pH 6.5. Uncouplers and the polyene antibiotic nystatin depolarized the cells, decreasing Δψ to −21±15 mV (n=10) with concomitant decrease ofR sp. Comparison of Δψ values from microelectrode measurements with those calculated from the steady-state distribution of tetraphenylphosphonium ions agreed within 10 mV under all physiological conditions tested, except at pH values above 7.0. During microelectrode insertion transient voltage signals (a few msec long) were detected by means of an oscilloscope. These voltage signals were superimposed on the stable Δψ recordings described above. These short voltage signals disappeared in uncoupled cells. The closely related Δψ values obtained by two independent methods (direct measurements with microelectrodes and calculation from steady-state distribution of a lipophilic cation) provide evidence that these values reffect the true membrane potential of intact cells.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 341 (1991), S. 155-165 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary When a shot is fired, the projectile and the cartridge case are released from the weapon, as well as components of the priming charge and propellant, the so-called powder-gunshot residues. In order to solve firearm offences, it is therefore very important to determine the topography of trace-bearing areas on the bullet and the cartridge case, as well as the chemical composition of gunshot residue particles. Gunshot residue particles are made visible with the scanning electron microscope (SEM) and are analysed by means of energy-dispersive X-ray spectroscopy (EDXS) and lately also by means of wavelength-dispersive X-ray spectroscopy (WDXS). In addition to this, analyses of these particles are displayed by means of Auger electron spectroscopy (AES) and secondary ion mass spectroscopy (SIMS) and depth profiles are prepared. To determine the local distributions of gunshot residue elements with regard to their quantity, the direct Zeeman atomic absorption spectroscopy (DZ-AAS) is employed. Besides the determination of the chemical composition, the topography of the trace-bearing areas on the bullet and cartridge case plays an important part. For the detection of these surfaces, light optical and electron-optical methods are employed. Moreover, the use of opto-electronical testing systems has been attracting more and more attention recently.
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  • 10
    ISSN: 1573-5176
    Keywords: growth limitations ; Spirulina platensis ; open raceways ; productivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This work represents an attempt to assess the relative contribution of the factors limiting productivity ofSpirulina platensis in open raceways throughout the year. Temperature of the culture during daylight exerted the predominant effect on productivity and elevating the temperature resulted in a significant rise in productivity even in summer. Photoinhibition had a decisive role in summer in determining productivity ofSpirulina in open raceways in that growth almost ceased after mid-day. Contamination by other microorganisms, particularlyS. minor andChlorella sp. was estimated to reduce the net biomass yield by at least 15 to 20%, but measures to curtail the establishment of these species in the raceway have been devised. The effect of harvest time during the day on the yield of dry mass was examined: no conclusion could be drawn except in mid-summer, when evening harvesting resulted in a significant increase in the output rate of dry weight over morning harvesting. It was estimated that in a subtropical climate with little cloudiness, it should be readily possible to obtain an annual output rate of dry mass of ca. 60 to 70 t ha−1. Such output, however, which would reduce very substantially the cost of production to-date, is possible only if the optimal temperature forSpirulina can be maintained throughout daylight, photoinhibition essentially controlled, harvesting in summer performed in the evening, and night-loss of dry mass as well as the extent of contamination by other cyanobacteria or microalgae can be kept low. The pronounced daily fluctuations in the output rate at peak productivity in summer suggest that when environmental limitations of growth are minimal, other limitations become dominant. These should be identified to facilitate an even greater increase in the productivity ofSpirulina in outdoor cultures.
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