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  • 1
    Electronic Resource
    Electronic Resource
    Spectrophotometric determination of mixtures of 2-, 3-, and 4-hydroxybenzaldehydes by flow injection analysis and uv/vis photodiode-array detection
    Amsterdam : Elsevier
    Talanta 41 (1994), S. 59-66 
    Details
    ISSN: 0039-9140
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0039-9140(94)80168-1
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  • 2
    Electronic Resource
    Electronic Resource
    Substitution titration: a new approach to automatic titration
    Amsterdam : Elsevier
    Analytica Chimica Acta 217 (1989), S. 303-319 
    Details
    ISSN: 0003-2670
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0003-2670(00)80412-2
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  • 3
    Electronic Resource
    Electronic Resource
    Presence of an essential polyunsaturated fatty acid in intradigestive bacterial symbionts of a deposit-feeder echinoid (Echinodermata)
    Amsterdam : Elsevier
    Comparative Biochemistry and Physiology -- Part B: Biochemistry and 100 (1991), S. 503-505 
    Details
    ISSN: 0305-0491
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0305-0491(91)90211-U
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  • 4
    Electronic Resource
    Electronic Resource
    Intracoelomic parasitic Sporozoa in the burrowing spatangoid echinoidEchinocardium cordatum: coelomocyte reaction and formation of brown bodies (1984)
    Springer
    Helgoland marine research 37 (1984), S. 225-231 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Echinocardium cordatum frequently harbours in its coelomic cavity the protozoan parasiteLithocystis schneideri. Motile stages of this gregarine (trophozoites and gamonts) may be surrounded by echinoid coelomocytes which show a peculiar transformation of their shape (i.e. each cell develops a single spine-like extension giving a pincushion aspect to the parasite). Encysted stages of the gregarine (gametocysts and sporocysts) are found mostly within brown bodies. Brown bodies are particular mesothelium-covered formations occurring usually in the coelomic cavity ofE. cordatum. It is suggested that brown bodies naturally originate from detached fragments of mesenteries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01989307
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  • 5
    Electronic Resource
    Electronic Resource
    Simultaneous determination of cobalt and nickel by flow injection analysis and partial least squares regression with outlier detection
    Amsterdam : Elsevier
    Chemometrics and Intelligent Laboratory Systems 14 (1992), S. 297-303 
    Details
    ISSN: 0169-7439
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0169-7439(92)80113-I
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  • 6
    Electronic Resource
    Electronic Resource
    Rank annihilation factor analysis applied to flow injection analysis with photodiode-array detection
    Amsterdam : Elsevier
    Chemometrics and Intelligent Laboratory Systems 23 (1994), S. 107-114 
    Details
    ISSN: 0169-7439
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0169-7439(93)E0070-K
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  • 7
    Electronic Resource
    Electronic Resource
    Sulfide-oxidizing bacteria in the burrowing echinoid, Echinocardium cordatum (Echinodermata) (1993)
    Springer
    Marine biology 115 (1993), S. 179-185 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Symbiotic filamentous bacteria thrive in the intestinal caecum of the deposit-feeding echinoid Echinocardium cordatum. Specimens of E. cordatum were collected at Wimereux (Nord Pas-de-Calais, France) in 1991. Their symbiotic bacteria build nodules by forming multilayered mats around detrital particles that enter the caecum. The morphological features of the bacteria are those of Thiothrix, a sulfide-oxidizing genus. The filaments, which may form rosettes, are sheathed and made by a succession of hundreds of rod-shaped bacteria which store elemental sulfur in the presence of external sulfide. Live bacteria are restricted to the outer layers of the nodules. Their sulfide-oxidizing activity was investigated, using a Biological Oxygen Monitor, by measuring the O2-consumption when reduced sulfur compounds are provided. They oxidize thiosulfate and sulfide. Optimal sulfide oxidation occurs at intermediary pO2 (100 to 160 μM O2l-1). Spectrophotometry has confirmed that the sulfur content of the filamentous symbiotic sulfideoxidizing bacteria depends on the presence of external sulfide. This is the first report of symbiotic intradigestive Thiothrixspp.-like bacteria; it lengthens the list of symbioses between sulfide-oxidizing bacteria and invertebrates from sulfide-rich habitats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00346333
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  • 8
    Electronic Resource
    Electronic Resource
    Frontal ambulacral and peribuccal areas of the spatangoid echinoid Echinocardium cordatum (Echinodermata): a functional entity in feeding mechanism (1987)
    Springer
    Marine biology 94 (1987), S. 613-624 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Echinocardium cordatum (Pennant, 1777) were collected in Normandy, France, in March and November 1985. The grooved frontal ambulacrum of the burrowing echinoid E. cordatum functions in transferring surface sediment from the apex to the mouth of the echinoid. Particles that fall down the burrow's chimney accumulate between the spines of the apical tuft and are taken over by specialized groove spines. Due to the slope of the groove and the type of floor spines it harbours, four successive regions can be recognized, namely the adapical region, the fasciolar region, the ambital region, and the adoral region. As a general rule aboral floor spines (i.e. club-shaped, golf-club-shaped, and isodiametric spines) function in gathering particles while propelling them mouthwards; they simultaneously embed particles in a mucous string. The oral floor spines (i.e. spatulated spines) function in hauling and guiding the mucous string towards the peribuccal area of the echinoid. Once facing the peribuccal area, particles are picked up by the peribuccal tube feet that either transfer them into the esophagus or scrape them out against the peribuccal spines. Spine-retained particles are either sucked up by the pumping action of the esophagus or fall to the burrow's floor where the tube feet may pick them up again. Together the apical tuft, the frontal groove, and the peribuccal area form an efficient food-collecting system that transfers trapped surface particles from the echinoid apex down to the mouth. Compared to that of most other spatangoids the frontal ambulacrum of E. cordatum is highly specialized. Such specialization is related to colonization of fine sediment, as is the occurrence of a chimney linking the burrow to the sediment surface. Actually the burrow's chimney is the only route for oxygen and food supply; it acts as a real ecological umbilical cord for spatangoids buried in fine sediment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00431408
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  • 9
    Electronic Resource
    Electronic Resource
    Patterns of acid deposition to a Danish spruce forest (1986)
    Springer
    Water, air & soil pollution 30 (1986), S. 135-141 
    Details
    ISSN: 1573-2932
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Bulk precipitation and bulk throughfall was collected during the period September to November 1984 in a Danish spruce forest. Samples were analyzed for all major anions and cations as well as strong and total acidity. The acid load to the forest ecosystem was estimated adding the throughfall fluxes of protons (79 eq ha−1mo−1), ammonium (99 eq ha−1mo−1) and a calculated estimate oflthe protons buffered by exchange processes in the canopy (75 eq ha−1 mo−1). This is still a minimum estimate but it exceeds the proton load determined by pH measurement in bulk throughfall and bulk precipitation by factors 3 and 6, respectively. Throughfall fluxes of all major cations and anions except ammonium decreased with distance from the trunk.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00305182
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  • 10
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    The precipitation response to the desiccation of Lake Chad (2012)
    Wiley
    Details
    Publication Date: 2012-04-15
    Description: Located in the semi-arid African Sahel, Lake Chad has shrunk from a surface area of 25000 km 2 in 1960 to about 1350 km 2 due to a series of droughts and anthropogenic influences. The disappearance of such a large open-water body can be expected to have a noticeable effect on the meteorology in the surroundings of the lake. The impact could extend even further to the west as westward propagating convective systems pass Lake Chad in the rainfall season. This study examines the sensitivity of the regional hydrology and convective processes to the desiccation of the lake using a regional atmospheric model. Three Lake Chad scenarios are applied reflecting the situation in 1960, the current situation and a potential future scenario in which the lake and the surrounding wetlands have disappeared. The model simulations span the months July–September in 2006, which includes the rainfall season in the Lake Chad area. Total precipitation amounts and the components of the hydrological cycle are found to be hardly affected by the existence of the lake. A filled Lake Chad does, however, increase the precipitation at the east side of the lake. The model results indicate that the boundary layer moisture and temperature are significantly altered downwind of the lake. By investigating a mesoscale convective system (MCS) case, this is found to affect the development and progress of the system. At first, the MCS is intensified by the more unstable boundary layer air but the persistence of the system is altered as the cold pool propagation becomes less effective. The proposed mechanism is able to explain the differences in the rainfall patterns nearby Lake Chad between the scenarios. This highlights the local sensitivity to the desiccation of Lake Chad whereas the large-scale atmospheric processes are not affected. Copyright © 2011 Royal Meteorological Society
    Print ISSN: 0035-9009
    Electronic ISSN: 1477-870X
    Topics: Geography , Physics
    Published by Wiley
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