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  • 1
    Electronic Resource
    Electronic Resource
    Inhibitory effects of high molecular weight dissolved organic matter upon metabolic processes in biofilms from contrasting rivers and streams (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 24 (1990), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. 1. The effect of removal of organic manor 〉1000 apparent molecular weight (AMW) upon biofilm processes was determined in three contrasting streams in West Germany and three contrasting rivers in the U.K. This process removed 66–85% of the dissolved organic matter supply.2. Elevations in extra cellular enzyme activity (β-glucosidase, phosphatase and esterase), metabolic heat-output, bacterial density and poly-beta-hydroxy alkanoate (PHA) content (a prokaryote storage product) were noted throughout the study in response to the removal of organic matter. This suggests that there are inhibitory substances present in the dissolved organic matter pool 〉1000 AMW. Evidence is presented to suggest that phenolics play a role in this inhibition.3. Decreases in metabolic heat output, β-glucosidase activity and PHA content were noted at four sites in response to the removal of 〉1000 AMW material.4. The divergent responses of the six river/stream biofilms are indicative of radically differing metabolic/catabolic processes, on a spatial and/or temporal basis, to a major organic supply perturbation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1990.tb00315.x
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  • 2
    Electronic Resource
    Electronic Resource
    Seasonal trends in river biofilm storage products and electron transport system activity (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 26 (1991), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. 1. Glycogen, poly-beta-hydroxyalkanoate (PHA) and electron transport system (ETS) activity levels were monitored seasonally in light- and dark-grown biofilms from a North Wales river.2. A spring peak was evident in glycogen, PHA and ETS activity levels per cm2 and per cell, with the exception of PHA per cell, which peaked in the winter.3. There was a seasonal shift in the type of storage product found, perhaps reflecting seasonal changes in carbon sources.4. The light-grown spring biofilm yielded the greatest amount of bio-film storage products per cm2. This should be taken into account during caloric studies of river biofilms as a food source for grazing invertebrates.5. A model is presented of factors influencing storage product deposition in river biofilms. The thickness and cell packing of river biofilms should be noted in future studies. Storage product deposition can occur deep within thick biofilms, irrespective of the river water chemistry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1991.tb00505.x
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  • 3
    Electronic Resource
    Electronic Resource
    Soviet innovation (1980)
    [s.l.] : Nature Publishing Group
    Nature 284 (1980), S. 686-687 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Science and Industrialisation in the USSR: Industrial Research and Development, 1917–1940. By Robert Lewis. Pp.211. (Macmillan: London, UK, 1979.) £12. OVER the past 20 years the Birmingham Centre for Russian and East European Studies has established a high reputation for carefully ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/284686a0
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  • 4
    Electronic Resource
    Electronic Resource
    Soviet technology (1978)
    [s.l.] : Nature Publishing Group
    Nature 272 (1978), S. 781-782 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Technological Level of Soviet Industry. Edited by R. Amann, J. M. Cooper & R. W. Davies. Pp. 575. (Yale University Press: New Haven, Connecticut and London, 1977.) $30; £20. THIS volume is a landmark in the study of Soviet technology. There have, of course, been many previous ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/272781a0
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  • 5
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    Technical Change and Productivity (1989)
    Washington, D.C. : Periodicals Archive Online (PAO)
    Finance and Development. 26:3 (1989:Sept.) 46 
    Details
    ISSN: 0015-1947
    Topics: Economics
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:e355-1989-026-03-000015
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  • 6
    Electronic Resource
    Electronic Resource
    [14C] Acetate incorporation, an indicator of lipid biosynthesis within intact river biofilms (1993)
    Springer
    Journal of aquatic ecosystem stress and recovery 2 (1993), S. 329-334 
    Details
    ISSN: 1573-5141
    Keywords: biofilm ; activity ; lipid synthesis ; 14C acetate ; calorimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A method is described which enables lipid biosynthesis to be determined within intact river biofilms. Significantly different rates of biosynthesis were detected in rivers of differing nutrient availability and during different seasons. Rapid changes in microbial physiology could be detected within 24 hours. The technique appeared to be well suited to investigation of factors affecting lipid biosynthesis within biofilms. Although in contrast, acetate incorporation did not correlate with microcalorimetric total activity measurements over a 12-month period, and so the method did not appear suitable for determining total metabolic activity. However, microbial lipid biosynthesis produces a valuable food resource for the ecosystems higher tropic levels and thus the acetate incorporation technique could prove useful as an indicator of aspects of aquatic ecosystem health.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00044034
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  • 7
    Electronic Resource
    Electronic Resource
    [14C] Acetate incorporation, an indicator of lipid biosynthesis within intact river biofilms (1973)
    Springer
    Journal of aquatic ecosystem stress and recovery 2 (1973), S. 329-334 
    Details
    ISSN: 1573-5141
    Keywords: biofilm ; activity ; lipid synthesis ; 14C acetate ; calorimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A method is described which enables lipid biosynthesis to be determined within intact river biofilms. Significantly different rates of biosynthesis were detected in rivers of differing nutrient availability and during different seasons. Rapid changes in microbial physiology could be detected within 24 hours. The technique appeared to be well suited to investigation of factors affecting lipid biosynthesis within biofilms. Although in contrast, acetate incorporation did not correlate with microcalorimetric total activity measurements over a 12-month period, and so the method did not appear suitable for determining total metabolic activity. However, microbial lipid biosynthesis produces a valuable food resource for the ecosystems higher tropic levels and thus the acetate incorporation technique could prove useful as an indicator of aspects of aquatic ecosystem health.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00044034
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  • 8
    Electronic Resource
    Electronic Resource
    Poly-beta-hydroxy alkanoate and the support of river biofilm metabolism following radical changes in environmental conditions (1993)
    Springer
    Hydrobiologia 271 (1993), S. 159-164 
    Details
    ISSN: 1573-5117
    Keywords: river biofilm ; environmental change ; acclimation ; PHA ; extracellular enzymes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Endogenous carbon reserves such as poly-beta-hydroxy alkanoate (PHA) can sustain microbial viability during conditions of nutrient deprivation. Microbial extracellular enzyme activities under one set of environmental conditions might be wholly inappropriate for another, and thus PHA might also serve as an energy source as the biofilm acclimates to a changed environment. In order to test this hypothesis, radical changes in environmental conditions were imposed upon river biofilms by transferring them between three rivers of acid, circum-neutral and alkaline pH. The findings supported the hypothesis; each of the transfers resulted in reduced PHA levels, while the physiology of the biofilm (metabolic activity, population density, phosphatase & glucosidase activities) acclimated to the environmental conditions of the recipient site. The greatest PHA depletion was observed when the magnitude of the imposed change resulted in an inability of phosphatase enzyme to respond to the change. The implicit greater dependence on the reserves of PHA, is similarly consistent with the hypothesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00005413
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  • 9
    Electronic Resource
    Electronic Resource
    Book reviews (1995)
    Springer
    Minerva 33 (1995), S. 395-405 
    Details
    ISSN: 1573-1871
    Source: Springer Online Journal Archives 1860-2000
    Topics: Education , Nature of Science, Research, Systems of Higher Education, Museum Science
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01096520
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  • 10
    Electronic Resource
    Electronic Resource
    A comment on “expenditures on research and development in Poland” (1967)
    Springer
    Minerva 5 (1967), S. 371-375 
    Details
    ISSN: 1573-1871
    Source: Springer Online Journal Archives 1860-2000
    Topics: Education , Nature of Science, Research, Systems of Higher Education, Museum Science
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02388575
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