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  • 1
    Electronic Resource
    Electronic Resource
    CHANGE IN LAKE TROPHIC STATE AND INTERNAL PHOSPHORUS RELEASE AFTER ALUMINUM SULFATE APPLICATION (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 18 (1982), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : Recovery of eutrophic lakes after nutrient diversion may be delayed if the lake experiences significant internal phosphorus (p) loading to the water column. A maximum dose of aluminum sulfate, defined herein, was applied to the anaerobic sediments of the hypolimnia of two dimictic Ohio lakes following septic tank diversion, with the objective of attaining long term control of the release of phosphorus to the water column from these sediments. The results were compared to a similar, downstream, untreated lake. Total phosphorus concentration declined sharply after treatment and has remained so through 1980 for both lakes, a period of 5 and 6 years of control, respectively. Internal P loading from anaerobic, hypolimnetic sediments was partially controlled by the treatment but there are other important sources, perhaps in the littoral zone, in these lakes. Algal biomass is Smaller and water transparency has increased. Both lakes became mesotrophic after treatment, as described by the Carlson (1977) trophic state index, and remain in that improved condition to date. No deleterious side effects were observed, although one lake experienced a significant decrease in diversity of planktonic microcrustacea and a lakeward extension of the macrophyte community. This method appears to be an effective and lasting means of accelerating the recovery of a eutrophic lake following nutrient diversion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1982.tb00054.x
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  • 2
    Electronic Resource
    Electronic Resource
    Estimating the Ozone Depletion Potential of Methyl Bromide (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Risk analysis 17 (1997), S. 0 
    Details
    ISSN: 1539-6924
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Ozone depletion potential (ODP) represents the cumulative ozone depletion induced by a particular halocarbon relative to a reference gas (usually trichlorofluoromethane, CFC-11). We focus on ODP estimation for methyl bromide. Previous attempts at its estimation have assumed that components of the ODP equation are lognormally distributed. By considering a wide range of modeling scenarios, we show that this restriction (which is based on computational convenience rather than experimental evidence) has obscured the true uncertainty in the ODP value. Moreover, when publishing point estimates for the ODP value, previous authors have given either mean or median values. We submit that a more appropriate choice for a point estimate is the mode since the distribution of ODP is skewed and since the mode is by definition, the most likely value. For each modeling scenario considered, modal values are given. In general, we find these ODP point estimates are considerably lower than those published elsewhere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1539-6924.1997.tb00839.x
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  • 3
    Electronic Resource
    Electronic Resource
    Assessing the Utility of Stochastic Employee Movements (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Decision sciences 22 (1991), S. 0 
    Details
    ISSN: 1540-5915
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: This article illustrates the substantial effects employee movements (i.e., movements due to employee promotions, transfers, and separations) have on the value of a human resource intervention. Two methods for estimating differential employee movements are presented and their resulting utility estimates are contrasted and compared. Finally, the advantages and disadvantages of each procedure are discussed as well as the value such information provides to organizational decision makers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-5915.1991.tb01269.x
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  • 4
    Electronic Resource
    Electronic Resource
    Geophysical Surveys in the Vicinity of Sanitary Landfills in Northeastern Illinois (1968)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 6 (1968), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Electrical earth resistivity and soil temperature surveys have been conducted in the vicinity of four sanitary landfills in northeastern Illinois to test the possibility of detecting and tracing any chemical or temperature alteration of ground water by leachates from buried refuse. Reference data on water quality, levels, and movement were provided by a system of monitor wells drilled for a hydrogeologic study of the landfills.The resistivity survey, which was in homogeneous silty sand outwash, traced mineralized water from the landfill for a distance of more than 1000 feet. Apparent resistivity values were one fourth those obtained from unaffected areas. Interpretations of direction of ground-water flow and location of discharge boundaries from the geophysical data agree vith interpretations based on the monitor well data.The soil temperature survey indicated the presence of a halo of higher temperatures around the landfill and indicated areas of surface recharge.The geophysical surveys show, in general, that chemically altered water is traceable in uniform earth materials where the depth of the water table is constant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1968.tb01661.x
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  • 5
    Electronic Resource
    Electronic Resource
    The CO2concentrating mechanism in cyanobactiria and microalgae (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 84 (1992), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Over the past 10 years it has become clear that cyanobacteria and microalgae possess mechanisms for actively acquiring inorganic carbon from the external medium and are able to use this to elevate the CO2 concentration around the active site of the primary photosynthetic carboxylating enzyme, ribulose bisphosphate carboxylase-oxygenase (Rubisco). This results in a vastly enhanced photosynthetic affinity for inorganic carbon (Ci) and improved photosynthetic efficiency. The CO2 concentrating mechanism is dependent on the existence of membrane bound Ci transport systems, and a microenvironment within the cell where the accumulated Ci can be used to elevate CO2 at the site of Rubisco. Evidence presented in this review suggests that in cyanobacteria this is achieved by the packaging of Rubisco and carbonic anhydrase (CA) into discrete structures, which are termed carboxysomes. Analogous structures in microalgae, termed pyrenoids, may perform a similar function. The recovery and analysis of high-CO2-requiring mutants has greatly advanced our understanding of the mechanisms and genes underlying these systems, especially in cyanobacteria, and this review places particular emphasis on the contribution made by molecular genetic approaches.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1992.tb04711.x
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  • 6
    Electronic Resource
    Electronic Resource
    Measurement of CO2 and HCO3− fluxes in cyanobacteria and microalgae during steady-state photosynthesis (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 90 (1994), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A mass spectrometric procedure is described which allows the simultaneous estimation of both CO2 and HCO−3 fluxes associated with cyanobacteria and green algae during steady-stale photosynthesis. This technique utilizes the chemical disequilibrium which exists between CO2 and HCO−3 during photosynthesis in cell suspensions which lack carbonic anhydrase activity. The kinetic equations which are derived for flux determinations are based on models of photosynthesis in both cyanobacteria and green algae which seem most reasonable given our present level of understanding, together with direct measurement of [CO2] estimation of [HCO−3] and application of the kinetic rate constants for the interconversion of CO2 and HCO−3 From measurements made in the light, net uptake of both CO2 and HCO−3 can be readily determined. In addition, analysis of the dark phase immediately following light-off provides the possibility of also determining the CO2 evolution whích ís occurring during photosynthesis, and thus also the gross CO2 uptake rates in the light. Results are presented for the response of dissolved inorganic carbon (C1) flux rates to external C, in low-C1 grown cells of both Synechococcus PCC7942 and Chlamydomonas reinhardtii and these are consistent with previous studies showing that such cells possess capacities to utilize both CO2 and HCO−3 for photosynthesis. The advantages and potential errors which are inherent in this technique are discussed together with its potential for future studies on C1 transport under various experimental conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1994.tb08811.x
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  • 7
    Electronic Resource
    Electronic Resource
    Carbonic anhydrase activity and inorganic carbon fluxes in low- and high-C1 cells of Chlamydomonas reinhardtü and Scenedesmus obliquus (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 90 (1994), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Carbonic anhydrase (CA) activity associated with high- and low-dissolved inorganic carbon (C1) grown cells was examined in whole cells by measuring 18O exchange from doubly labeled CO2 (13C18O18O). Both algal species showed the presence of extracellular (periplasmic) as well as intracellular CA activity, which were both greatly increased in low-C1 cells. The periplasmic CA activity was at least 40-fold higher in lowcompared to high-C1 cells in both C. reinhardtii and S. obliquus. while low-C1 cells of S. obliquus showed the highest activity of internal CA. The CA inhibitor ethoxyzolamide showed a strong inhibition of the C1 uptake process in both C. reinhardtii and S. obliquus as in cyanobacteria. which may indicate that the nature of the primary uptake process is similar in both green algae and cyanobacteria. By using a mass spectrometnc disequilibrium technique it was possible to separate the C1 fluxes of net HCO−3-uptake and net CO2-uptake during steady-state photosynthesis in high- and Sow-C1 grown cells of Chlamydomonas reinhardtii (WT. 2137+) and Scenedesmus obliquus (WT. D3). It was found that both high- and low-C1 cells of the two algae can utilize both CO2 and HCO−3 for photosynthesis, although low-C1 cells have a higher affinity for the uptake of both C1 species. Induction at low-C1 causes an increase in the affinity of both species for HCO−3 and CO2; changes in net CO2-uptake were, however, significantly greater.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1994.tb08812.x
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  • 8
    Electronic Resource
    Electronic Resource
    RADIOLOGIC CHANGES AFTER CESSATION OF EXPOSURE AMONG CHRYSOTILE ASBESTOS MINERS IN ITALY (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 330 (1979), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1979.tb18716.x
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  • 9
    Electronic Resource
    Electronic Resource
    A COMPARISON OF PHOSPHORUS AND WATER CONTRIBUTIONS BY SNOWFALL AND RAIN IN NORTHEAST OHIO (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 12 (1976), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: A record snowfall of 55.8 centimeters occurred on December 1 and 2, 1974 in Portage County, Ohio. An early winter thaw melted the greater part of the snow by December 22, 1974, and a two-day rain fell from December 23 to December 25. These weather events provided an opportunity to compare snowmelt and rainfall contribution to runoff and phosphorus loading to the Twin Lakes Watershed. Phosphorus concentrations of the snow and rain were determined. Six lake inflows and two lake outflows were measured daily for volume and phosphorus concentration.The snow added 217,000 cubic meters of water and 2.2 kilograms of total phosphorus to the watershed. The rain added 74,000 cubic meters of water and 1.6 kilograms of total phosphorus. Total water discharge from the watershed during December was 244,537 cubic meters and total phosphorus output was 20.3 kilograms. The snow provided 49.9% of the discharge and 8% of the phosphorus whereas the rainfall contributed 28% of the discharge and 6% of the phosphorus. These results indicate that while snow is a significant source of water, it is not a large source of phosphorus. The greatest contribution of phosphorus comes from fine sediment carried by storm runoff.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1976.tb02715.x
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