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  • 1
    Electronic Resource
    Electronic Resource
    Growth and content of energy reserves in juvenile sea scallops, Placopecten magellanicus, as a function of swimming frequency and water temperature in the laboratory (1996)
    Springer
    Marine biology 124 (1996), S. 629-635 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of swimming frequency and water temperature on shell growth, tissue mass, and stored energy reserves of juvenile sea scallops, Placopecten magellanicus Gmelin, were examined in a factorial laboratory experiment spanning six weeks in July and August 1992. Individually tagged scallops of similar initial size (22.5±0.1 mm shell height, n=240) were induced to swim to exhaustion at three different swimming frequencies (every day, twice a week, or not at all) in two different water temperature regimes (4 to 7 or 7 to 13°C). The scallops were fed an ad libitum mixture of cultured microalgae. At the end of the experiment, cumulative increase in shell height, dry weight of soft tissues, condition index of dry adductor muscle (adductor muscle dry weight/soft tissue dry weight x 100) and total carbohydrate content of dry adductor muscle were measured for each scallop. Scallops at the higher temperature had significantly greater shell heights, and were in better metabolic condition as evidenced by significantly higher condition indices and muscle carbohydrate contents. The dry soft tissue weights did not differ significantly from their low temperature counterparts. Swimming frequency had no significant effect on shell height, dry tissue weight, or carbohydrate content, but condition index of the adductor muscle increased significantly with swimming frequency. These results show that not only was there no cumulative cost of swimming in terms of shell growth, total soft tissue weight, or carbohydrate content in young scallops, but that condition of adductor muscle tissue was higher in scallops that swam.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351044
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  • 2
    Electronic Resource
    Electronic Resource
    Mechanisms of crustal uplift and subsidence at the Yellowstone caldera, Wyoming (1994)
    Springer
    Bulletin of volcanology 56 (1994), S. 261-270 
    Details
    ISSN: 1432-0819
    Keywords: Key words: Caldera Unrest ; Volcano Geodesy ; Uplift ; Subsidence ; Hydrothermal System ; Magmatic intrusion ; Yellowstone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract. Leveling surveys in 1923, 1976, and each year from 1983 to 1993 have shown that the east-central part of the Yellowstone caldera, near the base of the Sour Creek resurgent dome, rose at an average rate of 14±1 mm/year from 1923 to 1976 and 22±1 mm/year from 1976 to 1984. In contrast, no detectable movement occurred in the same area from 1984 to 1985 (–2±5 mm/year), and from 1985 to 1993 the area subsided at an average rate of 19±1 mm/year. We conclude that uplift from 1923 to 1984 was caused by: (1) pressurization of the deep hydrothermal system by fluids released from a crystallizing body of rhyolite magma beneath the caldera, then trapped beneath a self-sealed zone near the base of the hydrothermal system; and (2) aseismic intrusions of magma into the lower part of the sub-caldera magma body. Subsidence since 1985 is attributed to: (1) depressurization and fluid loss from the deep hydrothermal system, and (2) sagging of the caldera floor in response to regional crustal extension. Future intrusions might trigger renewed eruptive activity at Yellowstone, but most intrusions at large silicic calderas seem to be accommodated without eruptions. Overpressurization of the deep hydrothermal system could conceivably result in a phreatic or phreatomagmatic eruption, but this hazard is mitigated by episodic rupturing of the self-sealed zone during shallow earthquake swarms. Historical ground movements, although rapid by most geologic standards, seem to be typical of inter-eruption periods at large, mature, silicic magma systems like Yellowstone. The greatest short-term hazards posed by continuing unrest in the Yellowstone region are: (1) moderate to large earthquakes (magnitude 5.5–7.5), with a recurrence interval of a few decades; and (2) small hydrothermal explosions, most of which affect only a small area (〈0.01 km2), with a recurrence interval of a few years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302079
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  • 3
    Electronic Resource
    Electronic Resource
    Workers' Compensation and Family and Medical Leave Act Claim Contagion (2000)
    Springer
    Journal of risk and uncertainty 20 (2000), S. 89-112 
    Details
    ISSN: 1573-0476
    Keywords: moral hazard ; contagion ; workers compensation ; FMLA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract At $60 billion per year, the workers' compensation system has come under increased scrutiny as firms, insurers, and researchers study the dynamics of claim filing. The Family and Medical Leave Act also covers most workers, and there has been very little research concerning the effects of FMLA legislation on employment. One hitherto neglected research area in both workers' compensation and FMLA is claim contagion. That is, as a claim is filed within a workgroup, does this increase the likelihood that others within the same workgroup will also file claims? We find the answer to be yes. We also find that this contagion effect is subject to diminishing returns to scale, however, in the sense that the claims probability increases at a decreasing rate as fellow employees' claims frequency increases. We argue that this is consistent with a model in which workers learn about filing a workers' compensation or FMLA claim from other workers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007866720772
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  • 4
    Electronic Resource
    Electronic Resource
    The negative photomagnetoelectric effect in cadmium selenide (1971)
    Springer
    Russian physics journal 14 (1971), S. 818-819 
    Details
    ISSN: 1573-9228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00822180
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  • 5
    Electronic Resource
    Electronic Resource
    The Dependence on Membrane Fluidity of Calcium Oxalate Crystal Attachment to IMCD Membranes (1997)
    Springer
    Calcified tissue international 60 (1997), S. 375 -379 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Urolithiasis — Calcium oxalate — Crystal attachment — Membrane fluidity.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. The development of urolithiasis is a multifaceted process, starting with urine supersaturation and ending with the formation of mature renal calculi. The retention of microcrystals by kidney tubule epithelium cell membranes has been proposed as a critical event in the process. To date, attachment of kidney stone constituent crystals to urothelial cells has been demonstrated both in vitro and in vivo yet the mechanism of crystal attachment remains unknown. We hypothesize that for effective stone crystal attachment to the epithelium there must be cell membrane rearrangement that would allow for long-range bonding between the stone crystal and the cell membrane. This rearrangement may be influenced by the physical state of the membrane. The current study examines calcium oxalate monohydrate (COM) crystal attachment to inner medullary collecting duct (IMCD) cells following changes in cell membrane fluidity. Radioactively labeled COM crystals were used to quantitate crystal attachment. Membrane fluidity was altered by changing temperature, cell membrane cholesterol content, or extended length of cell culture. Crystal attachment to IMCD cells was directly correlated to changes in membrane fluidity. This finding was consistently observed regardless of the method used to alter membrane fluidity. The results are consistent with the theory that the ability to form a crystal attachment region on the cell surface may be related to the ease of rearrangement of membrane components at the cell surface. Variations in the urothelial cell environment during certain pathological conditions in the kidney could induce these physical perturbations and prime kidney epithelial cells at or near the papillary tip to bind COM crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002239900246
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  • 6
    Electronic Resource
    Electronic Resource
    Mechanisms of crustal uplift and subsidence at the Yellowstone caldera, Wyoming (1994)
    Springer
    Bulletin of volcanology 56 (1994), S. 261-270 
    Details
    ISSN: 1432-0819
    Keywords: Caldera Unrest ; Volcano Geodesy ; Uplift ; Subsidence ; Hydrothermal System ; Magmatic intrusion ; Yellowstone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Leveling surveys in 1923, 1976, and each year from 1983 to 1993 have shown that the east-central part of the Yellowstone caldera, near the base of the Sour Creek resurgent dome, rose at an average rate of 14±1 mm/year from 1923 to 1976 and 22±1 mm/year from 1976 to 1984. In contrast, no detectable movement occurred in the same area from 1984 to 1985 (-2±5 mm/year), and from 1985 to 1993 the area subsided at an average rate of 19±1 mm/year. We conclude that uplift from 1923 to 1984 was caused by: (1) pressurization of the deep hydrothermal system by fluids released from a crystallizing body of rhyolite magma beneath the caldera, then trapped beneath a self-sealed zone near the base of the hydrothermal system; and (2) aseismic intrusions of magma into the lower part of the sub-caldera magma body. Subsidence since 1985 is attributed to: (1) depressurization and fluid loss from the deep hydrothermal system, and (2) sagging of the caldera floor in response to regional crustal extension. Future intrusions might trigger renewed eruptive activity at Yellowstone, but most intrusions at large silicic calderas seem to be accommodated without eruptions. Overpressurization of the deep hydrothermal system could conceivably result in a phreatic or phreatomagmatic eruption, but this hazard is mitigated by episodic rupturing of the self-sealed zone during shallow earthquake swarms. Historical ground movements, although rapid by most geologic standards, seem to be typical of inter-eruption periods at large, mature, silicic magma systems like Yellowstone. The greatest short-term hazards posed by continuing unrest in the Yellowstone region are: (1) moderate to large earthquakes (magnitude 5.5–7.5), with a recurrence interval of a few decdes; and (2) small hydrothermal explosions, most of which affect only a small area (〈0.01 km2), with a recurrence interval of a few years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302079
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  • 7
    Electronic Resource
    Electronic Resource
    The exterior Neumann problem for the three-dimensional Helmholtz equation (1966)
    Springer
    Archive for rational mechanics and analysis 23 (1966), S. 218-236 
    Details
    ISSN: 1432-0673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00253158
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  • 8
    Electronic Resource
    Electronic Resource
    The dirichlet problem for the Helmholtz equation (1965)
    Springer
    Archive for rational mechanics and analysis 18 (1965), S. 205-229 
    Details
    ISSN: 1432-0673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00285433
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  • 9
    Electronic Resource
    Electronic Resource
    The exterior Neumann problem for the Helmholtz equation (1973)
    Springer
    Archive for rational mechanics and analysis 52 (1973), S. 26-43 
    Details
    ISSN: 1432-0673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00249090
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  • 10
    Electronic Resource
    Electronic Resource
    His Own Synthesis: Corn, Edgar Anderson, and Evolutionary Theory in the 1940s (1999)
    Springer
    Journal of the history of biology 32 (1999), S. 293-320 
    Details
    ISSN: 1573-0387
    Keywords: biosystematics ; Edgar Anderson ; Evolutionary Synthesis ; Ernst Mayr ; Jesup Lectures ; Missouri Botanical Garden ; maize research ; G. Ledyard Stebbins, Jr. ; Paul C. Mangelsdorf ; Pioneer Hi-Bred Corn Company
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , History
    Notes: Abstract Tracing the contributions of Edgar Anderson (1897--1969) of the Missouri Botanical Garden to the important discussions in evolutionary biology in the 1940s, this paper argues that Anderson turned to corn research rather than play a more prominent role in what is now known as the Evolutionary Synthesis. His biosystematic studies of Iris and Tradescantia in the 1930s reflected such Synthesis concerns as the species question and population thinking. He shared the 1941 Jesup Lectures with Ernst Mayr. But rather than preparing his lectures as a potentially key text in the Synthesis, Anderson began researching Zea mays -- its taxonomy, its origin, and its agronomic role. In this study, Anderson drew on the disciplines of taxonomy, morphology, genetics, geography, anthropology, archaeology, and agronomy among others in his own creative synthesis. Though his maize research in the 1940s represented the most sustained work of his career, Anderson was also drawn in many directions during his professional life. For example, he enjoyed teaching, working with amateurs, and popular writing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004424810841
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