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  • 1
    Electronic Resource
    Electronic Resource
    Biological Control of Eutrophication in Lakes (1995)
    s.l. : American Chemical Society
    Environmental science & technology 29 (1995), S. 784-786 
    Details
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/es00003a028
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  • 2
    Electronic Resource
    Electronic Resource
    BACTERIAL GROWTH EFFICIENCY IN NATURAL AQUATIC SYSTEMS (1998)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Ecology, Evolution, and Systematics 29 (1998), S. 503-541 
    Details
    ISSN: 0066-4162
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Notes: Abstract Heterotrophic bacteria perform two major functions in the transformation of organic matter: They produce new bacterial biomass (bacterial secondary production [BP]), and they respire organic C to inorganic C (bacterial respiration [BR]). For planktonic bacteria, a great deal has been learned about BP and its regulation during the past several decades but far less has been learned about BR. Our lack of knowledge about BR limits our ability to understand the role of bacteria in the carbon cycle of aquatic ecosystems. Bacterial growth efficiency (BGE) is the amount of new bacterial biomass produced per unit of organic C substrate assimilated and is a way to relate BP and BR: BGE = (BP)/(BP + BR). Estimates of BGE for natural planktonic bacteria range from 〈0.05 to as high as 0.6, but little is known about what might regulate this enormous range. In this paper we review the physiological and ecological bases of the regulation of BGE. Further, we assemble the literature of the past 30 years for which both BP and BR were measured in natural planktonic ecosystems and explore the relationship between BGE and BP. Although the relationship is variable, BGE varies systematically with BP and the trophic richness of the ecosystem. In the most dilute, oligotrophic systems, BGE is as low as 0.01; in the most eutrophic systems, it plateaus near 0.5. Planktonic bacteria appear to maximize carbon utilization rather than BGE. A consequence of this strategy is that maintenance energy costs (and therefore maintenance respiration) seems to be highest in oligotrophic systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ecolsys.29.1.503
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental measurements of zebra mussel (Dreissena polymorpha) impacts on phytoplankton community composition (1998)
    Oxford, UK : Blackwell Science Ltd, UK
    Freshwater biology 39 (1998), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. To investigate direct effects of zebra mussel (Dreissena polymorpha) feeding activities on phytoplankton community composition, short-term microcosm experiments were performed in natural water with complex phytoplankton communities. Both gross effects (without resuspension of mussel excretions) and net effects (with resuspension) were studied.2. Gross clearance rates were not selective; essentially all taxa were removed at similar rates ranging from 24 to 63 mL mussel–1 h–1. Net clearance rates were highly selective; different plankton taxa were removed at very different rates, ranging from 12 to 83% of the gross rates, leading to consistent changes in the phytoplankton community composition. Thus, although zebra mussels can cause most phytoplankton to decline, there is considerable variation among taxa in either pre-digestive selection or post-digestive survival.3. The direct, short-term effects of zebra mussels on phytoplankton community composition are consistent with some of the major changes observed in the Hudson River since establishment of zebra mussels.4. We show, with simple calculations, how zebra mussel filtration rate, its selective efficiency on various taxa, and phytoplankton growth rates interact to produce changes in the phytoplankton composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.1998.00283.x
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  • 4
    Electronic Resource
    Electronic Resource
    Biomass and annual production of the freshwater mussel Elliptio complanata in an oligotrophic softwater lake (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Freshwater biology 11 (1981), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY. An extensive survey of Mirror Lake, New Hampshire, was carried out by divers with SCUBA to assess the importance of the freshwater mussel Elliptio complanata in this softwater lake ecosystem. Density (0.032 adults m−2), biomass (52 mg m−2 as dry organic matter) and annual production (6.4 mg m−2 as dry organic matter) of the mussel population are low when compared with results from other studies, corresponding with the general observation that mussels are scarce in soft, oligotrophic waters. We reject the traditional view that the low mussel density is a result of low calcium concentrations in Mirror Lake, and propose that mussel populations may be regulated by a scarcity of appropriate fish hosts in unproductive lakes. Elliptio complanata is probably not important in the metabolism or biochemistry of the Mirror Lake ecosystem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2427.1981.tb01275.x
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  • 5
    Electronic Resource
    Electronic Resource
    The New Centre for Maritime Archaeology at Oxford University (2004)
    Oxford, UK : Blackwell Publishing Ltd
    The @international journal of nautical archaeology 33 (2004), S. 0 
    Details
    ISSN: 1095-9270
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Archaeology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-9270.2004.0016b.x
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  • 6
    Electronic Resource
    Electronic Resource
    About face (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 392 (1998), S. 14-14 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SirAlthough I am grateful that my book About Face was reviewed in Nature (390, 458; 1997), I should like to point out that, contrary to Stuart Sutherland's claim, I was not instrumental in setting up the charity Changing Faces. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/32031
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  • 7
    Electronic Resource
    Electronic Resource
    Reply Photosynthesis or planktonic respiration? (1997)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 388 (1997), S. 132-133 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] del Giorgio and Cole reply — Geiderraises two main issues: first, he points to substantial evidence suggesting net autotrophy in surface ocean waters; and second, he argues that the estimates of bacterial respiration we used in our paper, which are based largely on measurements of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/388132b0
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  • 8
    Electronic Resource
    Electronic Resource
    Absence of severe tardive dyskinesia in hungarian schizophrenic out-patients (1980)
    Springer
    Psychopharmacology 71 (1980), S. 29-34 
    Details
    ISSN: 1432-2072
    Keywords: Tardive dyskinesia ; Out-patient schizophrenics ; Neuroleptics ; Antiparkinson treatment ; EST in schizophrenia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract One hundred and twenty-two patients comprising 82% of the non-hospitalized schizophrenic population of a Hungarian town were rated for tardive dyskinesia (TD). Drug histories were also obtained. No severe cases of TD were found. The markedly lower prevalence of TD in the study population in contrast to similar North American samples may be related to differences in treatment styles, in particular to: a) use of EST in place of high-dose neuroleptic therapy; b) extensive exposure to ethopropazine, promethazine, and other antiparkinson drugs. Twenty patients revealed clinically evident fine tremors, mostly of the tongue and eye-lid. Multivariate analysis revealed a positive association of choreiform dyskinesia with duration of low-potency neuroleptic treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00433248
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  • 9
    Electronic Resource
    Electronic Resource
    ACTH 4-10 in the amelioration of neuropsychological symptomatology associated with senile organic brain syndrome (1979)
    Springer
    Psychopharmacology 61 (1979), S. 161-165 
    Details
    ISSN: 1432-2072
    Keywords: Senile organic brain syndrome ; ACTH 4-10 ; Polypeptide ; Organon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Eighteen male and female volunteers over the age of sixty who exhibited mild senile organic brain syndrome were administered ACTH 4-10 (Org OI 63) (30 mg, s.c.) or saline in a 2×2 Latin square design. Subjects experienced a reduction in depression and confusion and an increase in vigor. This evidence of an increase in vigor was supported behaviorally by a delay in the onset of increased latency in reaction time. Data also indicated that retrieval from memory may be enhanced by this compound. The electroencephalogram evinced a shift to lower frequencies under ACTH 4-10, but this effect was primarily noted in the females who received drug followed by placebo. These effects of ACTH 4-10 are intriguing and suggest that further work in this area should be encouraged.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00426731
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  • 10
    Electronic Resource
    Electronic Resource
    Ernst Rothlin (1965)
    Springer
    Psychopharmacology 8 (1965), S. I 
    Details
    ISSN: 1432-2072
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00405355
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