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  • 1
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    Historians of geology in the field: a half-century of INHIGEO excursions (2016)
    Geological Society (of London)
    Details
    Publikationsdatum: 2016-07-24
    Beschreibung: When INHIGEO was born at Yerevan in 1967, it was agreed that field excursions would be an integral part of its activities. Although the bylaw that was adopted to this effect has since lapsed, the practice of combining meetings and excursions has continued. Meeting venues and the excursions associated with them are suggested by members in the host country and their organization is very much a local responsibility. Although the meetings commonly have a theme specific to them, the excursions may be more general depending on what can be achieved in the general vicinity of the venue and the interests and specializations of those running them. While it is accepted practice to visit geologically important sites, there is also a recognition that participants often appreciate the inclusion of localities or monuments of historical and cultural interest. This reflects the professional breadth of INHIGEO's membership (whose main disciplines span the geosciences as well as the history of science, in addition to some other fields) and also acknowledges the general understanding that geology, like every science, develops within the cultural milieus where it is practised. Excursions organized with specifically historical objectives respond to a variety of ideas about the goals of historical understanding, ranging along a scientific–historical spectrum. Excursions may be short, lasting from a few hours to a half or even a full day (these are frequently held during the course of the meeting); longer excursions may last up to a week or even more and are almost always scheduled either prior to or after the close of the meeting sessions. Whatever their duration, INHIGEO excursions have always proved to be educational and enlightening and are often among the most memorable of a meeting's experiences.
    Print ISSN: 0305-8719
    Digitale ISSN: 2041-4927
    Thema: Geologie und Paläontologie
    Publiziert von Geological Society (of London)
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    The safety of foods developed by biotechnology (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1992-06-26
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kessler, D A -- Taylor, M R -- Maryanski, J H -- Flamm, E L -- Kahl, L S -- New York, N.Y. -- Science. 1992 Jun 26;256(5065):1747-9, 1832.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Food and Drug Administration (FDA), Rockville, MD 20857.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1615315" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; *Biotechnology ; *Consumer Product Safety ; Food/*adverse effects ; Food Hypersensitivity ; Genetic Engineering ; Humans ; Legislation, Drug ; Plants, Genetically Modified ; United States ; United States Food and Drug Administration
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    Research ethics and the EPA (2004)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 2004-12-29
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Childress, James F -- Taylor, Michael R -- New York, N.Y. -- Science. 2004 Dec 24;306(5705):2191; author reply 2191.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15622559" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Bioethical Issues ; Ethics Committees, Research ; *Ethics, Research ; *Government Regulation ; Human Experimentation/*ethics/standards ; Humans ; *Research Subjects ; United States ; *United States Environmental Protection Agency
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    Net biogenic silica production and the contribution of diatoms to new production and organic matter export in the Costa Rica Dome ecosystem (2016)
    Oxford University Press
    Details
    Publikationsdatum: 2016-03-19
    Beschreibung: We determined the net rate of biogenic silica (bSiO 2 ) production and estimated the diatom contribution to new production and organic matter export in the Costa Rica Dome during summer 2010. The shallow thermocline significantly reduces bSiO 2 dissolution rates below the mixed layer, leading to significant enhancement of bSiO 2 relative to organic matter (silicate-pump condition). This may explain why deep export of bSiO 2 in this region is elevated by an order of magnitude relative to comparable systems. Diatom carbon, relative to autotrophic carbon, was low (〈3%); however, the contribution of diatoms to new production averaged 3 and 13% using independent approaches. The 4-old discrepancy between methods may be explained by a low average C:Si ratio (~1.4) for the net produced diatom C relative to the net produced bSiO 2 . We speculate that this low production ratio is not the result of reduced C, but may arise from a significant contribution of non-diatom silicifying organisms to bSiO 2 production. The contribution of diatoms to organic matter export was minor (5.7%). These results, and those of the broader project, suggest substantial food-web transformation of diatom organic matter in the euphotic zone, which creates enriched bSiO 2 relative to organic matter within the exported material.
    Print ISSN: 0142-7873
    Digitale ISSN: 1464-3774
    Thema: Biologie
    Publiziert von Oxford University Press
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
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    Phytoplankton production and grazing balances in the Costa Rica Dome (2016)
    Oxford University Press
    Details
    Publikationsdatum: 2016-03-19
    Beschreibung: We investigated phytoplankton production rates and grazing fates in the Costa Rica Dome (CRD) during summer 2010 based on dilution depth profiles analyzed by flow cytometry and pigments and mesozooplankton grazing assessed by gut fluorescence. Three community production estimates, from 14 C uptake (1025 ± 113 mg C m –2 day –1 ) and from dilution experiments analyzed for total Chl a (990 ± 106 mg C m –2 day –1 ) and flow cytometry populations (862 ± 71 mg C m –2 day –1 ), exceeded regional ship-based values by 2–3-fold. Picophytoplankton accounted for 56% of community biomass and 39% of production. Production profiles extended deeper for Prochlorococcus (PRO) and picoeukaryotes than for Synechococcus (SYN) and larger eukaryotes, but 93% of total production occurred above 40 m. Microzooplankton consumed all PRO and SYN growth and two-third of total production. Positive net growth of larger eukaryotes in the upper 40 m was balanced by independently measured consumption by mesozooplankton. Among larger eukaryotes, diatoms contributed ~3% to production. On the basis of this analysis, the CRD region is characterized by high production and grazing turnover, comparable with or higher than estimates for the eastern equatorial Pacific. The region nonetheless displays characteristics atypical of high productivity, such as picophytoplankton dominance and suppressed diatom roles.
    Print ISSN: 0142-7873
    Digitale ISSN: 1464-3774
    Thema: Biologie
    Publiziert von Oxford University Press
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    Phytoplankton production and taxon-specific growth rates in the Costa Rica Dome (2016)
    Oxford University Press
    Details
    Publikationsdatum: 2016-03-19
    Beschreibung: During summer 2010, we investigated phytoplankton production and growth rates at 19 stations in the eastern tropical Pacific, where winds and strong opposing currents generate the Costa Rica Dome (CRD), an open-ocean upwelling feature. Primary production ( 14 C-incorporation) and group-specific growth and net growth rates (two-treatment seawater dilution method) were estimated from samples incubated in situ at eight depths. Our cruise coincided with a mild El Niño event, and only weak upwelling was observed in the CRD. Nevertheless, the highest phytoplankton abundances were found near the dome center. However, mixed-layer growth rates were lowest in the dome center (~0.5–0.9 day –1 ), but higher on the edge of the dome (~0.9–1.0 day –1 ) and in adjacent coastal waters (0.9–1.3 day –1 ). We found good agreement between independent methods to estimate growth rates. Mixed-layer growth rates of Prochlorococcus and Synechococcus were largely balanced by mortality, whereas eukaryotic phytoplankton showed positive net growth (~0.5–0.6 day –1 ), that is, growth available to support larger (mesozooplankton) consumer biomass. These are the first group-specific phytoplankton rate estimates in this region, and they demonstrate that integrated primary production is high, exceeding 1 g C m –2 day –1 on average, even during a period of reduced upwelling.
    Print ISSN: 0142-7873
    Digitale ISSN: 1464-3774
    Thema: Biologie
    Publiziert von Oxford University Press
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  • 7
    Digitale Medien
    Digitale Medien
    Franz–Keldysh effect in an optical waveguide containing a resonant tunneling diode (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 1076-1078 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Optical modulation in a waveguide containing a resonant tunneling diode has been observed. The observations are in agreement with a model which assumes that the modulation effect is due to a Franz–Keldysh band-edge shift produced by the electric field developed over a depletion region association with operation of the resonant tunneling diode. The effect has device potential for optical modulation at microwave frequencies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.112130
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Overview of Clean-Up Methods for Contaminated Sites (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Water and environment journal 6 (1992), S. 0 
    Details
    ISSN: 1747-6593
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Energietechnik
    Notizen: The selection of clean-up methods for contaminated land depends upon the nature and degree of contamination and on standards for clean up. There have been two approaches to clean-up standards, namely ‘multifunctionality’, where the site is cleaned up to a standard suitable for any use, and the ‘end use’approach, as used in the UK, where clean up is to a standard suitable for the immediate use proposed for the site.Clean-up options fall into four categories: (i) excavation and off-site removal; (ii) encapsulation and cover; (iii) retention of contaminated soil on site after treatment; and (iv) removal of contaminants from soil and reuse of cleaned soil on site.In the UK, clean up has been dominated by off-site disposal and encapsulation/cover, while soil treatment techniques have been used mainly in the US and some European countries such as the Netherlands. This is largely as a result of the availability and relatively low cost of landfill in the UK and the lesser importance attached to date to groundwater considerations.Soil treatment processes include biological, physicochemical, and thermal processes, all generally of much higher cost.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1747-6593.1992.tb00770.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    The Impact of Flue-gas Desulphurization on the Water Environment (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Water and environment journal 3 (1989), S. 0 
    Details
    ISSN: 1747-6593
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Energietechnik
    Notizen: Electricity generation in the UK is dominated by fossil fuels, principally coal. In order to reduce emissions of sulphur dioxide to the atmosphere new fossil fuel-fired power stations will be equipped with flue-gas desulphurization (FGD) facilities, and in the short term the Central Electricity Generating Board proposes to retrofit FGD systems to 6000 MW of its coal-fired generation capacity, including the 4000-MW station at Drax. The first generation of these plants will be based on the limestone-gypsum process.In addition to the product gypsum the process generates a liquid effluent as a result of the need to remove chloride from the process inter alia to protect gypsum quality. This effluent also contains other contaminants such as metals, fluoride and nitrate, and a mathematical model has been developed to predict effluent volumes and composition as a function of different coal, limestone and process water combinations. The model also calculates the effect of the discharge of this effluent on a receiving watercourse, both untreated and following treatment based on neutralization and precipitation/sedimentation.The paper discusses the development of the mathematical model and the impact of treated FGD effluent on power station cooling-water discharges, via which the effluent would normally be discharged, for both once-through and recirculating cooling systems used at coastal and inland stations respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1747-6593.1989.tb01517.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    The Effect of Temperature and Impurities on Certain Photochemical Reactions in Solids (1948)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 52 (1948), S. 828-836 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j150461a008
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