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  • 1995-1999  (8)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Measurement of the methyl radical concentration profile in a hot-filament reactor (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 144-146 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spatial profile of methyl radical concentration in a hot-filament reactor has been measured using cavity ring-down spectroscopy (CRDS) at a wavelength of 213.9 nm for which the CH3 absorption cross section has been shown to be nearly independent of temperature. Methyl radicals are generated with a 25 mm long tungsten filament heated to 2400 K in a slowly flowing mixture of 0.6% CH4 in H2 (20 Torr total pressure). CRDS is employed to measure CH3 absorbance as a function of a distance perpendicular to the axis of the filament. The CH3 absorbance profiles do not change when the direction of the process gas flow through the reactor is reversed, which indicates cylindrical symmetry of the CH3 distribution about the filament. Consequently, the radial CH3concentration in the reactor is determined by Abel inversion of the CH3 absorbance profile. The CH3concentration peaks ∼4 mm from the filament (1.04×1014molecules/cm3). Methyl radicals decay rapidly as a function of a distance from the filament and disappear about 2 cm from the filament within our present detection sensitivity (3×1012molecules/cm3). © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115475
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Feeding of larval blue whiting and Atlantic mackerel: a comparison of foraging strategies (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 51 (1997), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Fish larvae employ different feeding strategies depending on area and season of spawning and hatching of larvae. Feeding and growth of larvae of blue whiting Micromesistius poutassou and mackerel Scomber scombrus from Porcupine Bank and the Celtic Shelf Break, west of Ireland, were compared based on prey concentrations in the environment and larval feeding behaviour. Both species were adapted to different environmental conditions. The mesopelagic blue whiting spawned in oceanic water that was well mixed. It was characterized by low production and low prey densities with minimum prey densities 〈1.0 organism 1−1. Larvae of the Atlantic mackerel hatched later in the season in more productive water that was well stratified. Prey densities in the mackerel environment reached up to 1001−1. Blue whiting larvae displayed a rather random distribution in the water column. Mackerel larvae 〈7 mm standard length (Ls) were concentrated above the thermocline, while larvae 〉7 mm traversed the thermocline into deeper layers. Mackerel larvae 〉5mm Ls displayed marked cannibalism, exceeding 70%. Daily ration calculated on the basis of gut contents was rather low in both species: between 2.6 and 5.0% in blue whiting, but only 0.6 to 5.4% in mackerel. The results are discussed in relation to the respective environment both species encounter during their early larval life.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1997.tb06101.x
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    Paper (German National Licenses)
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  • 3
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    Unknown
    Hydrochemistry and phytoplankton abundance at time series station Helgoland Roads, North Sea, in 1989 (1999)
    PANGAEA
    Details
    Publication Date: 2024-06-20
    Keywords: Ammonium; Analyst; BAH; Calculated (sum of Nitrate, Nitrite, Ammonium); DATE/TIME; Depth of Secchi Disk; Diatoms; Diatoms, biomass as carbon; Flagellates; Flagellates, biomass as carbon; German Bight, North Sea; HelgolandRoads; HelgolandRoads1989; Helgoland Roads Timeseries; Kabeltonne; Kabeltonne, Long-term Ecological Research Helgoland Roads; LTER_Benthos; LTER_HelgolandRoads; Macrobenthic long-term series in the German Bight; Meeresstation Helgoland; Mercury thermometer, in situ; MON; Monitoring; Nitrate; Nitrite; Nitrogen, inorganic, dissolved; Phosphate; Photometer, azo-dye (Bendschneider & Robinson, 1952, J Mar Res, 11:87-96); Photometer, beta-silicomolybdic acid, modified (Carlberg, 1972, ICES Res Rep 29); Photometer, DTT, modified (Grasshoff et al., 1983, Verlag Chemie GmbH Weinheim); Photometer, molybdene blue, reduct ascorbic acid (Grasshoff, 1979, Chemie GmbH); Phytoplankton; Phytoplankton, biomass as carbon; Quantitative phytoplankton method (Utermöhl, 1958); Reduction by copper coated cadmium granulate; Salinity; Salinometer, inductive; Secchi disc; Shelf Seas Systems Ecology @ AWI (former Biologische Anstalt Helgoland); Silicate; Silicon Cycling in the World Ocean; SINOPS; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 3912 data points
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    DATA PANGAEA
  • 4
    facet.materialart.
    Unknown
    Hydrochemistry and phytoplankton abundance at time series station Helgoland Roads, North Sea, in 1991 (1999)
    PANGAEA
    Details
    Publication Date: 2024-06-20
    Keywords: Ammonium; Analyst; BAH; Calculated (sum of Nitrate, Nitrite, Ammonium); DATE/TIME; Depth of Secchi Disk; Diatoms; Diatoms, biomass as carbon; Flagellates; Flagellates, biomass as carbon; German Bight, North Sea; HelgolandRoads; HelgolandRoads1991; Helgoland Roads Timeseries; Kabeltonne; Kabeltonne, Long-term Ecological Research Helgoland Roads; LTER_Benthos; LTER_HelgolandRoads; Macrobenthic long-term series in the German Bight; Meeresstation Helgoland; Mercury thermometer, in situ; MON; Monitoring; Nitrate; Nitrite; Nitrogen, inorganic, dissolved; Phosphate; Photometer, azo-dye (Bendschneider & Robinson, 1952, J Mar Res, 11:87-96); Photometer, beta-silicomolybdic acid, modified (Carlberg, 1972, ICES Res Rep 29); Photometer, DTT, modified (Grasshoff et al., 1983, Verlag Chemie GmbH Weinheim); Photometer, molybdene blue, reduct ascorbic acid (Grasshoff, 1979, Chemie GmbH); Phytoplankton; Phytoplankton, biomass as carbon; Quantitative phytoplankton method (Utermöhl, 1958); Reduction by copper coated cadmium granulate; Salinity; Salinometer, inductive; Secchi disc; Shelf Seas Systems Ecology @ AWI (former Biologische Anstalt Helgoland); Silicate; Silicon Cycling in the World Ocean; SINOPS; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 3824 data points
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    DATA PANGAEA
  • 5
    facet.materialart.
    Unknown
    Hydrochemistry and phytoplankton abundance at time series station Helgoland Roads, North Sea, in 1990 (1999)
    PANGAEA
    Details
    Publication Date: 2024-06-20
    Keywords: Ammonium; Analyst; BAH; Calculated (sum of Nitrate, Nitrite, Ammonium); DATE/TIME; DEPTH, water; Depth of Secchi Disk; Diatoms; Diatoms, biomass as carbon; Flagellates; Flagellates, biomass as carbon; German Bight, North Sea; HelgolandRoads; HelgolandRoads1990; Helgoland Roads Timeseries; Kabeltonne; Kabeltonne, Long-term Ecological Research Helgoland Roads; LTER_Benthos; LTER_HelgolandRoads; Macrobenthic long-term series in the German Bight; Meeresstation Helgoland; Mercury thermometer, in situ; MON; Monitoring; Nitrate; Nitrite; Nitrogen, inorganic, dissolved; Phosphate; Photometer, azo-dye (Bendschneider & Robinson, 1952, J Mar Res, 11:87-96); Photometer, beta-silicomolybdic acid, modified (Carlberg, 1972, ICES Res Rep 29); Photometer, DTT, modified (Grasshoff et al., 1983, Verlag Chemie GmbH Weinheim); Photometer, molybdene blue, reduct ascorbic acid (Grasshoff, 1979, Chemie GmbH); Phytoplankton; Phytoplankton, other, biomass as carbon; Quantitative phytoplankton method (Utermöhl, 1958); Reduction by copper coated cadmium granulate; Salinity; Salinometer, inductive; Secchi disc; Shelf Seas Systems Ecology @ AWI (former Biologische Anstalt Helgoland); Silicate; Silicon Cycling in the World Ocean; SINOPS; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 3887 data points
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    DATA PANGAEA
  • 6
    facet.materialart.
    Unknown
    Hydrochemistry and phytoplankton abundance at time series station Helgoland Roads, North Sea, in 1992 (1999)
    PANGAEA
    Details
    Publication Date: 2024-06-20
    Keywords: Ammonium; Analyst; BAH; Calculated (sum of Nitrate, Nitrite, Ammonium); DATE/TIME; Depth of Secchi Disk; Diatoms; Diatoms, biomass as carbon; Flagellates; Flagellates, biomass as carbon; German Bight, North Sea; HelgolandRoads; HelgolandRoads1992; Helgoland Roads Timeseries; Kabeltonne; Kabeltonne, Long-term Ecological Research Helgoland Roads; LTER_Benthos; LTER_HelgolandRoads; Macrobenthic long-term series in the German Bight; Meeresstation Helgoland; Mercury thermometer, in situ; MON; Monitoring; Nitrate; Nitrite; Nitrogen, inorganic, dissolved; Phosphate; Photometer, azo-dye (Bendschneider & Robinson, 1952, J Mar Res, 11:87-96); Photometer, beta-silicomolybdic acid, modified (Carlberg, 1972, ICES Res Rep 29); Photometer, DTT, modified (Grasshoff et al., 1983, Verlag Chemie GmbH Weinheim); Photometer, molybdene blue, reduct ascorbic acid (Grasshoff, 1979, Chemie GmbH); Phytoplankton; Phytoplankton, biomass as carbon; Quantitative phytoplankton method (Utermöhl, 1958); Reduction by copper coated cadmium granulate; Salinity; Salinometer, inductive; Secchi disc; Shelf Seas Systems Ecology @ AWI (former Biologische Anstalt Helgoland); Silicate; Silicon Cycling in the World Ocean; SINOPS; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 3936 data points
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    DATA PANGAEA
  • 7
    facet.materialart.
    Unknown
    Hydrochemistry and phytoplankton abundance at time series station Helgoland Roads, North Sea, in 1993 (1999)
    PANGAEA
    Details
    Publication Date: 2024-06-20
    Keywords: Ammonium; Analyst; BAH; Calculated (sum of Nitrate, Nitrite, Ammonium); DATE/TIME; Depth of Secchi Disk; Diatoms; Diatoms, biomass as carbon; Flagellates; Flagellates, biomass as carbon; German Bight, North Sea; HelgolandRoads; HelgolandRoads1993; Helgoland Roads Timeseries; Kabeltonne; Kabeltonne, Long-term Ecological Research Helgoland Roads; LTER_Benthos; LTER_HelgolandRoads; Macrobenthic long-term series in the German Bight; Meeresstation Helgoland; Mercury thermometer, in situ; MON; Monitoring; Nitrate; Nitrite; Nitrogen, inorganic, dissolved; Phosphate; Photometer, azo-dye (Bendschneider & Robinson, 1952, J Mar Res, 11:87-96); Photometer, beta-silicomolybdic acid, modified (Carlberg, 1972, ICES Res Rep 29); Photometer, DTT, modified (Grasshoff et al., 1983, Verlag Chemie GmbH Weinheim); Photometer, molybdene blue, reduct ascorbic acid (Grasshoff, 1979, Chemie GmbH); Phytoplankton; Phytoplankton, biomass as carbon; Quantitative phytoplankton method (Utermöhl, 1958); Reduction by copper coated cadmium granulate; Salinity; Salinometer, inductive; Secchi disc; Shelf Seas Systems Ecology @ AWI (former Biologische Anstalt Helgoland); Silicate; Silicon Cycling in the World Ocean; SINOPS; Temperature, water
    Type: Dataset
    Format: text/tab-separated-values, 3888 data points
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    DATA PANGAEA
  • 8
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    Measurement of the methyl radical concentration profile in a hot‐filament reactor (1995)
    American Institute of Physics
    Details
    Publication Date: 1995-07-03
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics
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