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  • 1
    Book
    Book
    Determination of marine phytoplanktonic biomass (1982)
    Details Availability
    Type of Medium: Book
    Series Statement: ICES council meeting papers 1982(28)
    Language: Undetermined
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  • 2
    Book
    Book
    Nutrient uptake by marine phytoplankton (1982)
    Details Availability
    Type of Medium: Book
    Series Statement: ICES council meeting papers 1982(29)
    Language: Undetermined
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  • 3
    Book
    Book
    The rate of utilization of nitrate-nitrite by natural phytoplankton populations in a reactor (1980)
    Details Availability
    Type of Medium: Book
    Series Statement: ICES council meeting papers 1980(20)
    Language: Undetermined
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  • 4
    Electronic Resource
    Electronic Resource
    Identification and quantitative analysis of kojic acid and arbutine in skin-whitening cosmetics (2001)
    Oxford, UK : Blackwell Science, Ltd
    International journal of cosmetic science 23 (2001), S. 0 
    Details
    ISSN: 1468-2494
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: After testing several chromatographic systems described in the literature, the optimal operating conditions were retained to develop a simple and rapid method grouping TLC and HPLC/UV for separation, identification and dosage of kojic acid (CAS RN 501-30-4) or arbutine (CAS RN 497-76-7) in skin-whitening cosmetic products. The screening is carried out by TLC on cellulose plate and by TLC on silicagel plate with UV indicator and polar mobile solvent. Regarding identification and quantitative determination by HPLC/UV, the best results were obtained by direct phase chromatography, using a polar stationary phase greffed with diol groups and a polar buffered mobile phase at PH 2,5.Intralaboratory prevalidation tests were carried out on the HPLC method: detection limit, linearity and intralaboratory repeatability of standard curves and repeatability of samples quantitative determination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1467-2494.2001.00074.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Carbon, nitrogen contents and stable carbon isotope abundance in mangrove leaves from an east African coastal lagoon (Kenya)
    Amsterdam : Elsevier
    Aquatic Botany 47 (1994), S. 175-183 
    Details
    ISSN: 0304-3770
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0304-3770(94)90012-4
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  • 6
    Electronic Resource
    Electronic Resource
    Elemental composition of suspended matter in the Scotia-Weddell Confluence area during spring and summer 1988 (EPOS leg 2) (1992)
    Springer
    Polar biology 12 (1992), S. 25-33 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary During austral spring and summer 1988 the upper 500 m of water column in the Scotia-Weddell Confluence was sampled for the elemental composition of total suspended matter. For particulate organic carbon surface water concentrations ranged between 2.5 and 15 μmol/l, with an estimated 19 to 47% of this pool being detrital carbon. In late November, the highest surface water particulate organic carbon concentrations (15 μmol/l) occurred in the Confluence area where they coincided with a maximum in particulate Si (1.7 μmol/l). Later in the season particulate Si in the Confluence area decreased to ≤0.3 μmol/l. In the Scotia Sea on the contrary, surface water particulate Si increased with time and reached 3 μmol/l in late December. For particulate Ca and Sr in surface water, strong gradients are observed across the Scotia Front (e.g. Ca: from 230 to 10 nmol/l; Sr: from 1.0 to 0.1 nmol/l), with highest concentrations in the Scotia Sea. In general, these distributions are confirmed by the observations on plankton species composition, done by other participants. In the Scotia Sea heavily calcified coccolithophorids and diatoms occurred throughout the season, while in the Confluence area heavily calcified coccolithophorids were absent and a switch-over from diatom to naked flagellate dominance was observed following a krill event. In the surface waters, the lithogenic Si fraction represents on average only 4% of the total particulate Si content. However, this fraction reaches 60% below 100 m depth in the Confluence area, due mainly to the presence of a sub-surface maximum in the aluminosilicate load (particulate Al content up to 30 pmol/l), probably reflecting advection of resuspended shelf sediments. Subsurface Ba/barite concentrations are highest in the Scotia Sea (280 pmol/l) and decrease through the Scotia Front to reach values of 100 pmol/l and less in the Confluence area, the marginal ice zone and the closed pack ice zone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00239962
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  • 7
    Electronic Resource
    Electronic Resource
    Nitrogen enrichment during decomposition of mangrove leaf litter in an east African coastal lagoon (Kenya): Relative importance of biological nitrogen fixation (1997)
    Springer
    Biogeochemistry 39 (1997), S. 15-35 
    Details
    ISSN: 1573-515X
    Keywords: decomposition ; leaf litter ; mangrove ; nitrogen fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract In situ decomposition of senescent leaves of twoabundant mangrove species (Rhizophora mucronataLamarck and Ceriops tagal (Perr) C.B. Rob),enrichment of nitrogen and activity of dinitrogenfixing bacteria during decomposition were investigatedduring both rainy and dry seasons in a tropicalcoastal lagoon (Gazi, Kenya). Rates of leafdecomposition were higher for R. mucronata thanfor C. tagal and were highest, for both species,during rainy season. Rates of decomposition, expressedas percentage dry mass loss, over a decompositionperiod of 50 days was: C. tagal (rainy season),69%; C. tagal (dry season), 27%; R.mucronata (rainy season), 98%; and R.mucronata (dry season), 48%. High rainfall anddiurnal tidal inundation appear to enhance the leafdecomposition process. Maximum rates of nitrogenfixation were 380 nmol N2 h-1 g-1 dw forC. tagal (rainy season), 78 nmolN2 h-1 g-1 dw for C. tagal (dryseason), 390 nmol N2 h-1 g-1 dw for R. mucronata (rainy season) and 189 nmolN2 h-1 g-1 dw for R. mucronata (dry season). Although N2 fixation rates werehighest during rainy season, total nitrogenimmobilised in the leaves was highest during the dryseason. Biological nitrogen fixation can account forbetween 13 to 21% of the maximum nitrogen immobilisedin the decaying mangrove leaves. Nitrogen fixation, asa source of allochthonous nitrogen, sustains anitrogen input to the mangrove ecosystem, which addssignificantly to the nitrogen input through leaflitterfall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005850032254
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  • 8
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    δ13C of Southern Ocean suspended organic matter during spring and early summer: regional and temporal variability (1997)
    Pergamon Press
    In:  Deep Sea Research Part II: Topical Studies in Oceanography, 44 (1-2). pp. 129-142.
    Details
    Publication Date: 2020-08-05
    Description: Observations are presented for stable carbon isotope abundance (δ13C) and organic carbon and nitrogen content of suspended organic matter from the Southern Ocean (Circumpolar Current and Polar Front) during spring and early summer. The Polar Front Zone was characterized by elevated plankton biomasses and phytoplankton activity, which also increased significantly over the one-month investigation period. From the beginning of the phytoplankton bloom δ13C values of suspended organic matter in the Polar Front were high, exceeding values predicted from the relationship with CO2(aq) concentration observed in other areas of the Southern Ocean. Later in the season δ13C of suspended organic matter in the Polar Front became more negative despite continued high biomass and productivity. Ambient CO2 concentration and cell growth rate, therefore, are not the only factors controlling the δ13C of phytoplankton. The possible additional impact of shifts in nitrogen uptake regime is discussed.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0967-0645(96)00073-2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    Export production in the Bay of Biscay as estimated from barium – barite in settling material: a comparison with new production (2000)
    Elsevier
    In:  Deep Sea Research Part I: Oceanographic Research Papers, 47 (4). pp. 583-601.
    Details
    Publication Date: 2020-08-05
    Description: We present barium data for sediment traps deployed in a northeast Atlantic margin environment (Bay of Biscay). Fluxes of excess barium were measured with the objective of calculating carbon export production rates from the surface mixed layer and thus contribute to the understanding of organic carbon transport in a margin environment. Therefore, it was necessary to properly understand the different processes that affected the barium fluxes in this margin environment. Seasonal variability of POC/Ba flux ratios and decrease of barium solubilisation in the trap cups with increasing depth in the water column probably indicate that the efficiency of barite formation in the organic micro-environment varies with season and that the process is relatively slow and not yet completed in the upper 600 m of water column. Thus barite presence in biogenic aggregates will significantly depend on water column transit time of these aggregates. Furthermore, it was observed that significant lateral input of excess-Ba can occur, probably associated with residual currents leaving the margin. This advected excess-Ba affected especially the recorded fluxes in the deeper traps (〉1000 m) of the outer slope region. We have attempted to correct for this advected excess-Ba component, using Th (reported by others for the same samples) as an indicator of enhanced lateral flux and assigning a characteristic Ba/Th ratio to advected material. Using transfer functions relating excess-Ba flux with export production characteristic of margin areas, observed Ba fluxes indicate an export production between 7 and 18 g C m−2 yr−1. Such values are 3–7 times lower than estimates based on N-nutrient uptake and nutrient mass balances, but larger and more realistic than is obtained when a transfer function characteristic of open ocean systems is applied. The discrepancy between export production estimates based on excess-Ba fluxes and nutrient uptake could be resolved if part of the carbon is exported as dissolved organic matter. Results suggest that margin systems function differently from open ocean systems, and therefore Ba-proxy rationales developed for open ocean sites might not be applicable in margin areas.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/S0967-0637(99)00072-2
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  • 10
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    Redfield behavior of barbon, nitrogen, and phosphorus depletions in Antarctic surface water (1999)
    In:  EPIC3Limnology and Oceanography, 44(1), pp. 220-224
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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