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  • 1
    Electronic Resource
    Electronic Resource
    THE EFFECT OF CURRENT ON PERIPHYTIC PRODUCTIVITY AS DETERMINED USING CARBON-14 (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: : Productivity measurements of organisms attached to artificial substrates ranged from 6.5–7.6 mg C/m2/hr and were 17-65% greater in stirred bottles (simulated flow) than under static conditions. Carbon-14 was used to determine the effect of current on the primary productivity of these organisms in six artificial streams at the Flowing Streams Laboratory on the Savannah River Plant (U.S. Energy Research and Development Administration, Aiken, South Carolina, U.SA.). Seasonal changes in dominant organisms were monitored from June 1973 to March 1974. Estimates of productivity, accumulated biomass, and levels of chlorophyll a were compared for possible correlation. Production of chlorophyll a ranged from 50 to 381 mg/m2, and accumulated biomass ranged from 45 to 181 g/m2 on the artificial substrates (glass microscope slides) during the period of study. Productivity of attached organisms was generally an order of magnitude greater than productivity of phytoplankton or tychoplankton. The consistently higher productivity in simulated flowing systems than in static systems tends to cast some doubt on values obtained when lotic communities have been enclosed or isolated in chambers or bottles without inducing a current or stirring action.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1976.tb00247.x
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  • 2
    Electronic Resource
    Electronic Resource
    Ferric trimaltol corrects iron deficiency anaemia in patients intolerant of iron (1998)
    Oxford UK : Blackwell Science Ltd
    Alimentary pharmacology & therapeutics 12 (1998), S. 0 
    Details
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Oral iron supplements, which are usually in the form of ferrous (Fe2+) salts, are toxic to the gastrointestinal mucosa, and so intolerance is common, resulting in poor compliance and failure of treatment. The sugar derivative maltol strongly chelates iron, rendering it available for absorption and stabilized in the less toxic ferric (Fe3+) form.〈section xml:id="abs1-2"〉〈title type="main"〉Aim:To test whether ferric trimaltol could correct iron deficiency anaemia in patients intolerant of ferrous sulphate.〈section xml:id="abs1-3"〉〈title type="main"〉Methods:Twenty-three patients were recruited from gastroenterology clinics, of whom 15 had inflammatory bowel disease, a group often difficult to treat with oral iron. Patients with iron deficiency anaemia and documented intolerance to ferrous sulphate were given 3 months of treatment with ferric trimaltol.〈section xml:id="abs1-4"〉〈title type="main"〉Results:Nineteen of 23 patients completed the treatment and anaemia was fully corrected in 14 of these, mean haemoglobin increased from 106 ± 15 to 126 ± 16 g/L, and there was a particularly low incidence of side-effects. Of 11 patients with inflammatory bowel disease who completed the study, nine fully corrected their anaemia.〈section xml:id="abs1-5"〉〈title type="main"〉Conclusion:The results demonstrate that in patients intolerant of ferrous compounds, ferric trimaltol corrects iron deficiency and has a low incidence of side-effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2036.1998.00380.x
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  • 3
    Electronic Resource
    Electronic Resource
    Recovery of aquatic bacterial populations in a stream after cessation of chemical pollution (1977)
    Springer
    Water, air & soil pollution 7 (1977), S. 95-101 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Tims Branch was studied for 1 yr to determine the effects of an annual loading of about 229 900 kg of various chemicals on the bacterial populations of a small fast flowing stream. The 10 yr discharge of chemical waste to this stream was terminated in 1973 and a 2 yr study of the stream's recovery was begun. Upper Three Runs, an adjacent nonpolluted stream, was used as a control. Total culturable bacterial counts, per cent chromagenic bacteria and diversity were used as indices of recovery. Plate count agar was used for culturing aquatic bacteria present in both systems. Diversity in both systems was more affected by seasonal temperatures than the presence of chemical pollution. Mean total counts dropped from 187 × 103 in the polluted stream to approximate those of the control stream (170 × 103) following cessation of pollution. In the chemically affected stream, per cent chromagens increased from 15% during pollution to 25% approximately 1 yr after pollution was stopped. The latter percentage was comparable to that of the control stream (28%) during the period of study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00283802
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  • 4
    Electronic Resource
    Electronic Resource
    Concentration of 137Cs, 65Zn, and 85Sr by fresh-water algaeThis paper, as well as the three following, was presented at a Symposium on Recovery and Concentration of Compounds by Microbial Methods, held by the American Chemical Society at its annual meeting in New York City, September 12, 1966. (1967)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 9 (1967), S. 449-456 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Differences in the concentration and retention of 137Cs by unicellular diatoms, filamentous green algae, and filamentous blue-green algae were demonstrated under both batch and continuous-flow culture conditions. 137Cs concentration factors were generally higher by a factor of 2 in batch tests than in continuous flow tests. In retention studies, 137Cs was desorbed more rapidly from algae under continuous-flow conditions. Studies with blue-green algae indicate that 137Cs concentrations in the various species were more closely related to the surface-to-volume ratios of algal cells than to the systematic relationships of the three species. Continuous-flow studies indicated no differences among three species of filamentous green algae in the concentration of 137Cs, 65Zn, and 85Sr. However, the average concentration factors of the radionuclides were considerably different: 3800 for 65Zn, 460 for 137Cs, and 230 for 85Sr. These radionuclides were rapidly desorbed following the transfer of algae to nonradioactive media. The desorption rate was inversely related to the concentration rate.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260090402
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