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  • 1
    Electronic Resource
    Electronic Resource
    Chromogenic and Fluorogenic Crown Ether Compounds for the Selective Extraction and Determination of Hg(II) (1995)
    s.l. : American Chemical Society
    Analytical chemistry 67 (1995), S. 4101-4111 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00118a012
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  • 2
    Electronic Resource
    Electronic Resource
    Distribution of different anaerobic bacteria in arabian sea sediments (1981)
    Springer
    Marine biology 63 (1981), S. 277-281 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract During the “Orgon IV” cruise of the R.V. “Jean Charcot” (November, 1978), the distribution of heterotrophic aerobic, heterotrophic anaerobic, sulfate-reducing and methane-producing bacterial populations was studied at four sediment sampling stations in the Gulf of Aden and Oman Sea. The most important aerobic and anaerobic viable bacterial counts were achieved from samples in the upper layer below the water sediment interface. The maximal numbers of heterotrophic aerobes and anaerobes, as well as sulfate-reducing bacteria were found in the topmost layer (0 to 2 cm), although methanogenic bacteria that were only found in the shallowest station sediment (210 m), exhibited maximal population deeper in the sediment (10 to 12 cm). At the four stations studied, the heterotrophic anaerobic bacteria disappeared most rapidly with increasing core depth, and the heterotrophic aerobic bacteria paradoxically seemed to be more resistant to burying conditions. The coexistence of these four microflora, which exhibit various and even opposite metabolic processes, could be explained by a distinctive microniche juxtaposition in the same sedimentary layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00395997
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  • 3
    Electronic Resource
    Electronic Resource
    A WATERSHED-LEVEL ECOLOGICAL RISK ASSESSMENT METHODOLOGY (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 32 (1996), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : We present an ecological risk assessment methodology at the watershed level for freshwater ecosystems. The major component is a pollutant transport and fate model (a modified EUTROMOD) with an integrated uncertainty analysis utilizing a two-phase Monte Carlo procedure. The uncertainty analysis methodology distinguishes between knowledge uncertainty and stochastic variability. The model assesses the ecological risk of lentic (lake) ecosystems in response to the stress of excess phosphorus resulting in eutrophication. The methodology and model were tested on the Wister Lake watershed in Oklahoma with the lake and its trophic state as the endpoint for ecological risk assessment. A geographic information system was used to store, manage, and manipulate spatially referenced data for model input.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1996.tb04072.x
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  • 4
    Electronic Resource
    Electronic Resource
    REPLY TO DISCUSSION by Ray C. Whittemore (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 40 (2004), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2004.tb01025.x
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  • 5
    Electronic Resource
    Electronic Resource
    SEDIMENT OXYGEN DEMAND IN THE ARROYO COLORADO RIVER (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 39 (2003), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : The lower reaches of the Arroyo Colorado have historically failed to meet their use under subsection 303(b) of the U.S. Clean Water Act due to fecal coliform bacteria and low dissolved oxygen (DO). Fish kills, especially at the tidal confluence at the Port of Harlingen, Texas, have been reported. Oxygen demand from sediment (SOD) for a river typically has two states-diffusion limited SOD (SOD) and potential SOD (pSOD), expressed when sediment is resuspended through increased flow or other disturbances. The objective of this research was to measure SOD in the Arroyo Colorado River in situ, estimate pSOD ex situ, and evaluate the relationship between SOD and the depositional environment. We measured SOD and pSOD in the Arroyo Colorado River at up to eight sites over three sampling events. We identified the sample sites based on a modified Rosgen geomorphic index for streambed stabilization. Sites with high sediment deposition potential had high SOD. The average values of SOD between sites were 0.62 g/m2/day (standard deviation 0.38 g/m2/day) and ranged from 0.13 to 1.2 g/m2/day. Potential SOD values ranged from as low as 19.2 to as high as 2,779 g/m3 sediment/ day. Potential SOD can serve as an indicator of the possible impact of SOD from resuspended sediment in stream systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2003.tb04382.x
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  • 6
    Electronic Resource
    Electronic Resource
    Risk-Based Design of Aseptic Processing of Heterogeneous Food Products (2000)
    Boston, USA and Oxford, UK : Blackwell Publishers Inc.
    Risk analysis 20 (2000), S. 0 
    Details
    ISSN: 1539-6924
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: A risk assessment was performed to incorporate uncertainty in food processing conditions to develop a risk-based sterilization process design. The focus of this analysis was uncertainty associated with heterogeneous food products. Quartered button mushrooms were the chosen food product because it represents the most typical type. A model for sterilization of spherical particles was utilized, and each parameter's uncertainty was characterized for use under Monte Carlo simulation. Various particle distributions and fluid types were compared. The output of the model was the required sterilization time to achieve the target sterilization conditions with 95% probability. This value was then used to determine the mean fluid velocity for a given tube length. Finally, the output from the model was analyzed to determine the confidence in output based on uncertainty in the input parameters. The model was more sensitive to variation in particle size distribution than fluid type for power-law fluids. The 90% confidence interval included a holding time range of 1 min. With a 95% confidence level that only 8% of the data will be below the target sterilization conditions, a maximum of 9% of the data were expected to achieve double the target level. The results of such an analysis would be useful for management decisions concerning the design of aseptic food processing operations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/0272-4332.204040
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of cytokinin on chloroplast cyclic differentiation in cultured tobacco cells
    Amsterdam : Elsevier
    Cell Differentiation 4 (1975), S. 187-197 
    Details
    ISSN: 0045-6039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0045-6039(75)90040-8
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  • 8
    Electronic Resource
    Electronic Resource
    DISCUSSION (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 40 (2004), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.2004.tb01024.x
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  • 9
    Electronic Resource
    Electronic Resource
    LIMITING NUTRIENT DETERMINATION IN LOTIC ECOSYSTEMS USING A QUANTITATIVE NUTRIENT ENRICHMENT PERIPHYTOMETER (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 34 (1998), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : The decline of water quality in United States’ lotic ecosystems (streams and rivers) has been linked to nonpoint source nutrient loading (U.S. EPA, 1990). Determining limiting nutrients in streams is difficult due to the variable nature of lotic ecosystems. We developed a quantitative passive diffusion periphyton nutrient enrichment system, called the Matlock Periphytometer, to measure the response of attached algae (periphyton) to nutrient enrichment. The system is simple to build and provides quantitative nutrient enrichment of a surface for periphytic growth. The periphyton grow on a glass fiber filter, which allows complete recovery of periphyton for chlorophyll a analysis. A 14-kilodalton dialysis membrane was used as a biofilter to prevent bacterial and algal contamination of the nutrient solution. We determined the rates of diffusion of nitrogen and phosphorus ions across the Matlock Periphytometer's dialysis membrane and glass fiber filter over a 21-day period (42 and 22 μg/cm2/hr, respectively). We used the Matlock Periphytometer to determine the limiting nutrient in a woodland stream. Six replicates each of a control, nitrogen, and phosphorus treatment were placed in the stream for 14 days. The results indicated that phosphorus was the limiting nutrient in the stream for the period and location sampled.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1998.tb04160.x
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  • 10
    Electronic Resource
    Electronic Resource
    Thermodynamic studies of alkaline-earth-metal cation complexation by lipophilic dioxa, trioxa, and dithia dicarboxylic acids (1994)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 20 (1994), S. 131-142 
    Details
    ISSN: 1573-1111
    Keywords: Stability constants ; protonation constants ; di-ionizable lipophilic podands
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Five new lipophilic dicarboxylic acids with systematic structural variation in the bridge which joins the two lipophilic carboxylic acid units have been synthesized. Potentiometric equilibrium measurements of hydrogen ion concentrations have been employed to determine the protonation constants for these lipophilic di-ionizable acyclic ligands in 90% methanol-10% water (v/v) at 25.0 °C and an ionic strength of 0.10 M and the stability constants for their complexes with Mg2+, Ca2+, and Sr2+. Although all five ligands exhibit the highest stability constants for Ca2+, the magnitude of the differences between the stability constants for complexation of Ca2+ versus Mg2+ or Sr2+ is found to vary widely depending upon the identity of the bridging unit which joins the two carboxylic acid end groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00709337
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