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  • 1
    Electronic Resource
    Electronic Resource
    Autoradiographic localization of 5-hydroxytryptamine in monkey pineal gland (1970)
    Springer
    Cellular and molecular life sciences 26 (1970), S. 756-757 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Die Verteilung von aus 5-Hydroxy-Tryptophan entstandenem Serotonin in der Zirbeldrüse von Affen wird beschrieben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02232529
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  • 2
    Electronic Resource
    Electronic Resource
    Abstracts (1977)
    Springer
    Environmental management 1 (1977), S. 549-555 
    Details
    ISSN: 1432-1009
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01866690
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  • 3
    Electronic Resource
    Electronic Resource
    Long-term control of Phytophthora diseases of cocoa using trunk-injected phosphonate (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 43 (1994), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Pod rot and stem canker, caused by Phytophthora palmivora, are serious diseases of cocoa causing pod losses of up to 63% and the death of up to 10% of trees annually on Kar Kar Island. Papua New Guinea. Trials were conducted on commercial cocoa plantations to compare the effectiveness of potassium phosphonate when applied as trunk injections, trunk paints and foliar sprays, and trunk injections of Aliette CA and of Ridomil 250EC, with conventional Ridomil-based spray programmes. The results show that, in trials conducted over 5 years, injections of potassium phosphonate give the highest healthy pod yield and lowest incidence of Phytophthora pod rot and stem canker when compared with Ridomil-based spray programmes or trunk injections of Ridomil 250EC or Aliette CA. The increase in ripe healthy pod yields was due to both pod rot and stem canker control. The level of control is independent of the seasonal timing of injection. Optimum control was achieved with annual injections of 15 g a. i. per tree, and varied with tree size and disease severity. Injections of phosphonate will, under the range of conditions found in our trials. provide the most cost-effective control of Phytophthora diseases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1994.tb01581.x
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  • 4
    Electronic Resource
    Electronic Resource
    The influence of salinity on the chronic toxicity of atrazine to an estuarine copepod: Implications for development of an estuarine chronic criterion (1995)
    Springer
    Archives of environmental contamination and toxicology 28 (1995), S. 344-348 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract The goal of this study was to determine the influence of a range of salinities (5, 15, and 25 ppt) on the chronic toxicity of atrazine to the copepod, Eurytemora affinis during 8-day life-cycle tests. Survival, development (proportion of immature organisms) and reproduction (percent of egg-carrying females) were the endpoints used to determine chronic toxicity. Survival was the most sensitive endpoint and was therefore used to determine chronic values. The No Observed Effect Concentration (NOEC) and the Lowest Observed Effect Concentration (LOEC) at 5 ppt were 12.25 and 17.5 mg/L, respectively. The calculated chronic value was 14.6 mg/L. The NOEC and LOEC at 15 ppt were 17.5 and 25 mg/L, respectively, and the calculated chronic value at 15 ppt was 20.9 mg/L. The NOEC and LOEC at 25 ppt were 4.2 and 6.0 mg/L, respectively, while the calculated chronic value at 25 ppt was 5.01 mg/L. Results from a bootstrapping statistical technique demonstrated that there was a significant difference (p〈0.05) between chronic values at 5 ppt (14.6 mg/L) and 25 ppt (5.01 mg/L), and between 15 ppt (20.9 mg/L) and 25 ppt (5.01 mg/L). There was no significant difference between chronic values at 5 ppt (14.6 mg/L) and 15 ppt (20.9 mg/L). These specific data for atrazine have important implications for development of estuarine water quality criteria, as toxicity test results at one salinity are not representative of the salinity range found in many estuaries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00213112
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  • 5
    Electronic Resource
    Electronic Resource
    Chronic Toxicity of Atrazine to Sago Pondweed at a Range of Salinities: Implications for Criteria Development and Ecological Risk (1997)
    Springer
    Archives of environmental contamination and toxicology 33 (1997), S. 261-267 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract. The objective of this study was to conduct a series of 28-d partial life-cycle atrazine subchronic toxicity tests with sago pondweed, Potamogeton pectinatus, at salinities of 1, 6, and 12 ppt. These data will be used for development of a chronic estuarine criterion for atrazine in Maryland waters of Chesapeake Bay and to determine possible ecological risk for a sensitive nontarget species. The three endpoints used for this submerged aquatic macrophyte were final wet weight, final dry weight, and final number of rhizome tips at the termination of the 28-d test. Dry weight was determined to be the most sensitive endpoint. Chronic values from a one-way ANOVA using dry weight were 21.2, 21.2, and 10.6 μg/L at salinities of 1, 6, and 12 ppt, respectively. Chronic values using wet weight were 21.2 μg/L at all three salinities. A chronic value of 94.9 μg/L was reported at all three salinities using rhizome tips as the endpoint. A two-way ANOVA was also used for analysis of data to increase the power of detecting differences among treatments and assess salinity interaction. The salinity effects were averaged in the two-way ANOVA. Both rhizome tips and dry weight were used in the two-way ANOVA; wet weight did not satisfy the equal variance assumption. The chronic value for rhizome tips was 94.9 μg/L atrazine, which is the same value reported from the one-way ANOVA. There was no salinity effect and no interaction between salinity and atrazine concentration. The chronic value determined from the two-way ANOVA using dry weight was 5.3 μg/L; there was a salinity effect but no significant salinity/atrazine concentration interaction. Salinity was not reported to effect either dry weight or rhizome tips after 28-d exposures in the controls but wet weight was significantly lower at 12 ppt when compared with 1 and 6 ppt. Ecological risk to sago pondweed from atrazine exposure was judged to be low based on recent exposure data from the mainstem, tributaries, and streams in Chesapeake Bay.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002449900252
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  • 6
    Electronic Resource
    Electronic Resource
    Minimizing life-cycle costs of gun propellant selection through model-based decision making: a case study in environmental screening and performance testing (2000)
    Springer
    Clean products and processes 2 (2000), S. 47-56 
    Details
    ISSN: 1436-722X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract  The work presented here demonstrates the first phases of a newly-proposed gun propellant formulation process that will minimize life-cycle costs through science-based design. This new approach to gun propellant formulation proposes maximal use of modeling and simulation in the earliest phases of the developmental cycle to screen candidate formulations, resulting in the elimination of probable poor performers and the identification of the most promising candidates for further study and testing. The screening and identification of promising candidate formulations is demonstrated in the study presented here under the assumption of a specific weapon platform and user requirements. The process of selecting a propellant for the assumed gun system application has been distilled into a series of measurable steps leading from a set of candidate materials, through logical and numerical filters, to a shorter list of energetic materials demonstrated as viable choices for the weapon platform. Environmental filtering and performance modeling are used to screen propellants through a well-defined sequence of tests designed to weed out materials that do not meet standards in terms of safety, energy, or manufacturability. Because much of the testing is performed by computer modeling, the gun systems and energetic materials need not be present (nor even existent) in order to be described and matched against performance requirements for future applications. The calculations presented here demonstrate that utilizing computer models in the early developmental stages of the formulation process rather than physical testing produces enormous savings in labor, material, and environmental costs, along with a tremendous reduction in the time required to select a "best candidate" propellant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100980050050
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  • 7
    Electronic Resource
    Electronic Resource
    Book reviews (1996)
    Springer
    Higher education 32 (1996), S. 243-246 
    Details
    ISSN: 1573-174X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Nature of Science, Research, Systems of Higher Education, Museum Science
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00138398
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  • 8
    Electronic Resource
    Electronic Resource
    Adiabatic reactive viscometry for polyurethane reaction injection moldingPortions presented at the Society of Rheology Meeting, Ann Arbor, Mich., Oct. 14-17, 1985, and the SAMPE Meeting, Las Vegas, April 8-10, 1986. (1987)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 27 (1987), S. 1236-1242 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Adiabatic reactive rheometry involves the simultaneous measurement of viscosity and temperature changes during adiabatic polymerization. Using the adiabatic reactor method to relate temperature to fractional conversion results in a useful rheokinetic tool ideally suited for fastreacting reaction injection molding (RIM) systems for which the mold-filling step is nearly adiabatic. In this work, a small laboratory RIM machine is used to mix the reactants and deliver them to a constant stress rheometer retrofitted with a wide-gap Couette geometry and two thermocouples. Measurements on two polyurethane systems are reported. A simple cross-linking system is used to verify the adiabatic rheokinetic method through comparison to a known gel conversion. Subsequent measurements on a phase-separating RIM system show that increases in catalyst level, hard segment content, and initial reactant temperature result in a decreased gel time and an increased gel conversion. The viscosity rise profiles aid our understanding of the onset and development of phase separation. They are also essential for mold-filling models and establishing moldability criteria for these RIM systems.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760271606
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  • 9
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    OPEN MAPPINGS OF COMPACT CONTINUA (1956)
    National Academy of Sciences
    Details
    Publication Date: 1956-06-01
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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    PAPER CURRENT
  • 10
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    ONE-DIMENSIONAL CONTINUOUS CURVES (1956)
    National Academy of Sciences
    Details
    Publication Date: 1956-10-01
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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