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  • 1
    Electronic Resource
    Electronic Resource
    Importance of molecular aggregation in the development of a topical local anesthetic (1993)
    s.l. : American Chemical Society
    Langmuir 9 (1993), S. 105-109 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00025a024
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  • 2
    Electronic Resource
    Electronic Resource
    Geobacter metallireducens gen. nov. sp. nov., a microorganism capable of coupling the complete oxidation of organic compounds to the reduction of iron and other metals (1993)
    Springer
    Archives of microbiology 159 (1993), S. 336-344 
    Details
    ISSN: 1432-072X
    Keywords: Iron ; Uranium ; Manganese ; Nitrate ; Anaerobic sediments ; Delta proteobacteria ; Aromatics ; Heavy metals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The gram-negative metal-reducing microorganism, previously known as strain GS-15, was further characterized. This strict anaerobe oxidizes several short-chain fatty acids, alcohols, and monoaromatic compounds with Fe(III) as the sole electron acceptor. Furthermore, acetate is also oxidized with the reduction of Mn (IV), U (VI), and nitrate. In whole cell suspensions, the c-type cytochrome(s) of this organism was oxidized by physiological electron acceptors and also by gold, silver, mercury, and chromate. Menaquinone was recovered in concentrations comparable to those previously found in gram-negative sulfate reducers. Profiles of the phospholipid ester-linked fatty acids indicated that both the anaerobic desaturase and the branched pathways for fatty acid biosynthesis were operative. The organism contained three lipopolysaccharide hydroxy fatty acids which have not been previously reported in microorganisms, but have been observed in anaerobic freshwater sediments. The 16S rRNA sequence indicated that this organism belongs in the delta proteobacteria. Its closest known relative is Desulfuromonas acetoxidans. The name Geobacter metallireducens is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00290916
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  • 3
    Electronic Resource
    Electronic Resource
    Hydrogen metabolism in a mildly acidic lake sediment (Knaack Lake) (1987)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 45 (1987), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Hydrogen metabolism was studied in anoxic Knaack Lake sediments by measuring the in situ concentrations of dissolved H2, as well as the Vmax, turnover rate constant, and Km for H2. The results show that the relatively low rate of H2/CO2-dependent methanogenesis is paralleled by a low turnover of the dissolved H2 pool. H2-dependent acetate formation did not appear to be of importance based on the discrepancy of the Km for H2 consumption between the sediment and the prevalent homoacetogenic microbial population. In this mildly acidic lake sediment, H2 turnover apparently was limited by H2 production from organic matter. During incubation of sediment under a gaseous headspace, H2 escaped from the aqueous phase, and steady state concentrations of dissolved H2 were significantly lower than under in situ conditions. H2 concentrations increased upon addition of various organic substrates. H2 turnover within the sediment appeared unrelated to the concentration of H2 detected in the water column, especially in the epilimnetic water layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1987.tb02362.x
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  • 4
    Electronic Resource
    Electronic Resource
    The Population Biology of Host-Pathogen Interactions (1989)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Phytopathology 27 (1989), S. 77-94 
    Details
    ISSN: 0066-4286
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.py.27.090189.000453
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  • 5
    Electronic Resource
    Electronic Resource
    Population Genetics and Intercontinental Migrations of Phytophthora Infestans (1992)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Phytopathology 30 (1992), S. 107-130 
    Details
    ISSN: 0066-4286
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.py.30.090192.000543
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  • 6
    Electronic Resource
    Electronic Resource
    Cuticle characteristics and volatile emissions of petals in Antirrhinum majus (2003)
    Oxford, UK : Munksgaard International Publishers
    Physiologia plantarum 117 (2003), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Floral volatiles, which are small and generally water-insoluble, must move from their intracellular sites of synthesis through the outermost cuticle membrane before release from the flower surface. To determine whether petal cuticle might influence volatile emissions, we performed the first analysis of petal cuticle development and its association with the emission of flower volatiles using Antirrhinum majus L. (snapdragon) as a model system. Petal cuticular wax amount and composition, cuticle thickness and ultrastructure, and the amounts of internal and emitted methylbenzoate (the major snapdragon floral scent compound) were examined during 12 days, from flower opening to senescence. Normal (n-) alkanes were found to be the major wax class of snapdragon petals (29.0% to 34.3%) throughout the 12 days examined. Besides n-alkanes, snapdragon petals possessed significant amounts of methyl branched alkanes (23.6–27.8%) and hydroxy esters (12.0–14.0%). Hydroxy esters have not been previously reported in plants. Changes in amount of methylbenzoate inside the petals followed closely with levels of methylbenzoate emission, suggesting that snapdragon petal cuticle may provide little diffusive resistance to volatile emissions. Moreover, clear associations did not exist between methylbenzoate emission and the cuticle properties examined during development. Nevertheless, the unique wax composition of snapdragon petal cuticles shows similarities with those of other highly permeable cuticles, suggesting an adaptation that could permit rapid volatile emission by scented flowers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1399-3054.2003.00047.x
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  • 7
    Electronic Resource
    Electronic Resource
    High-performance gamma-spectroscopy measurements of equipment retrieved from Hanford Site high-level nuclear waste tanks (1998)
    Springer
    Journal of radioanalytical and nuclear chemistry 233 (1998), S. 265-271 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The cleanup of high-level defense nuclear waste at the Hanford Site presents many challenges. These include removing and disposing of components from buried active waste tanks to allow new equipment insertion or hazards mitigation. This paper discusses a unique automated system that provides for retrieval, high-pressure washing, inventory measurement, and containment for disposal. Key to the inventory measurement is a three-detector high-purity germanium high-performance gamma-spectroscopy system capable of recovering data at up to 90-percent saturation (200,000 counts/s). Data recovery is based on a unique embedded electronic pulser and special software to report the inventory. Each detector has different shielding specified through simulation using the Monte Carlo computer code for N-particle transport modeling. This shielding provides performance over a dynamic range of eight orders of magnitude. This paper covers system description, calibration issues, and operation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02389682
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  • 8
    Electronic Resource
    Electronic Resource
    Emission of hydrogen from deep and shallow freshwater environments (1988)
    Springer
    Biogeochemistry 5 (1988), S. 295-311 
    Details
    ISSN: 1573-515X
    Keywords: lake water ; lake sediments ; paddy fields ; ebullition ; plant-mediated gas flux ; atmospheric H2 budget
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract In-situ partial pressures of hydrogen in anoxic profundal lake sediments reached values of up to 5 Pa which were more than 5 orders of magnitude lower than the partial pressures of methane. Analysis of gas bubbles collected from anoxic submerged paddy soil showed H2 partial pressures in the range of 1.8 ± 1.3 Pa being ca. 4 orders of magnitude lower than the CH4 partial pressures. H2 emission rates, on the other hand, were less than 3 orders of magnitude lower than the CH4 emission rates indicating that H2 and CH4 were oxidized to a different extent in the rhizosphere of the soil before they reached the atmosphere, or that H2 was produced by the plants. More than 70% of the emitted H2 reached the atmosphere via plant-mediated flux. The rest was emitted via ebullition from the anoxic soil and, in addition, was produced in the paddy water. A significant amount of H2 was indeed found to be produced in the water under conditions where thallic algae and submerged parts of the rice plants produced oxygen by photosynthesis. Very little H2 was emitted via molecular diffusion through the paddy water; in addition, this amount was less than expected from the degree of supersaturation and the diffusional emission rate of CH4 indicating a relatively high rate of H2 consumption in the surface film of the paddy water. The total H2 source strength of rice paddies and other freshwater environments was estimated to be less than 1 Tg yr-1, being negligible in the atmospheric budget of H2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02180069
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  • 9
    Electronic Resource
    Electronic Resource
    Comparison of dimethoate and methidathion tolerance in four strains ofPhytoseiulus persimilis (Athias-Henriot) (Acarina: Phytoseiidae) in Australia (1992)
    Springer
    Experimental and applied acarology 16 (1992), S. 255-261 
    Details
    ISSN: 1572-9702
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The toxicity of dimethoate 30EC and methidathion 40EC was tested against four strains ofPhytoseiulus persimilis obtained from commercial greenhouse rose crops. A single strain ofP. persimilis demonstrated tolerance to the field rate of 1.0 ml/l dimethoate used to controlHeliothrips haemorrhoidalis as indicated by the LC50 of 1.5 ml/l ai and a significantly different response at the LC90 level (P〈0.05) to the three other strains tested. None of the strains was different in level of response to methidathion (P〉0.05) and were unable to tolerate the recommended field rate of methidathion. Selection to dimethoate by routine field spraying has produced improved tolerance inP. persimilis. The dimethoate-tolerant strain was not different in developmental period and mean number of eggs produced per female when compared with the Sydney strain (P〉0.05).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01193808
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  • 10
    Electronic Resource
    Electronic Resource
    A portable, photon analysis spectrometer for the assay of X- and gamma-ray emitting radionuclides (1998)
    Springer
    Journal of radioanalytical and nuclear chemistry 233 (1998), S. 225-231 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A portable, battery-powered, multichannel analyzer (MCA) for use with Ge spectrometers has been developed for in-field use for the assay of x-and γ-ray emitting radionuclides. The spectrometer is capable of operating to rates greater than 150,000 counts per second. The analyzer is a Canberra InSpector MCA, that is equipped with the INEEL ultra-stable dual-energy pulser, and pulse injection with subsequent removal (PISR) circuitry. PCGAP, a set of MCA control and spectral analysis programs, was developed for use on a PC with a Windows NT Operating System. It includes an interactive peak analysis program as well as automatic spectral analysis programs for the X- and γ-ray regions, and a number of utility programs. The pulser peaks are calibrated with radioactive sources in terms of energy (i.e., their energy equivalents are measured) using the PCGAP spectral analysis package so that energy shifts, including those due to changes in temperature or count rate, do not cause a loss of energy calibration. The number of injected low- and high-energy-equivalent pulses is known so the stored pulser pulses can be used for a dead-time and random summing correction. The pulser peaks are also used to monitor any deterioration in spectral quality caused by noise, ground loops, etc. The results of performance tests to demonstrate the capabilities of this pulser-equipped InSpector are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02389676
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