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  • 1
    Online Resource
    Online Resource
    Hydrographic, chemical and planktological data from the north-west African upwelling area obtained from February to April 1983 : ("Ostatlantik-Biozirkel") (2017)
    Kiel : Inst. für Meereskunde
    Details Availability
    Type of Medium: Online Resource
    Pages: Online-Ressource (108 Seiten, 1,7 MB) , Diagramme
    Series Statement: Berichte aus dem Institut für Meereskunde an der Christian-Albrechts-Universität Kiel 140
    URL: https://oceanrep.geomar.de/32091/
    URL: http://dx.doi.org/10.3289/ifm_ber_140
    DOI: 10.3289/ifm_ber_140
    Language: English
    Note: Zusammenfassung in deutscher und englischer Sprache
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  • 2
    Electronic Resource
    Electronic Resource
    CT-guided intervention using a patient laser marker system (2000)
    Springer
    European radiology 10 (2000), S. 1010-1014 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Interventional radiology – Computed tomography – CT-guided biopsy – Laser guidance – Quality assurance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. To prove the usefulness of a simple laser marker system (LMS) in target definition as well as examination procedure for CT-guided interventions, 130 cases of diagnostic biopsies and lumbal sympathectomies were compared. In 75 cases LMS and in 55 cases a simple crossgrid was used. Taking advantage of the LMS, the parameters of intervention (cutaneous location, length, and angle) can be planned, exactly demonstrated, and it is possible to check the needle position during the whole procedure. Thus, the number of necessary control scans decreased to 30 %, and corrections of needle location were reduced to approximately 30 %. Moreover, the average target deviation of the needle decreased below 5 mm in 50 % of cases, and the duration of interventional procedure was reduced considerably. It can be concluded that LMSs are recommended in CT-guided interventions for quality assurance, dose reduction, and improvement of handling. It will be especially advantageous in cases of small target volume, oblique needle path, and tilted gantry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300051054
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Growth and grazing loss rates in single-celledPhaeocystis sp. (Prymnesiophyceae) (1990)
    Springer
    Marine biology 106 (1990), S. 153-158 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Growth and grazing loss rates of naturalPhaeocystis sp. single cells were measured using a seawater dilution technique. Measurements were performed during an intensePhaeocystis sp. bloom in the North Sea between 19 April and 5 May 1988. Experimental results yielded rapid carbon turnover rates. Population growth rates varied from 0.033 to 0.098 h−1, grazing loss rates from 0.037 to 0.174 h−1. From measured growth rates, average doubling rages of 1.3 doublings d−1 were calculated. The growth rates would have resulted in maximum carbon production rates of 146 mg C m−3 d−1. Grazing rates increased in the course of the bloom and exceeded growth rates at the end. Grazing loss was caused primarily by microzooplankton feeding. Ciliates and heterotrophic dinoflagellates were identified as the major potential consumers of single cells ofPhaeocystis sp. at the beginning of the bloom. The grazing impact of larger microzooplankton species appeared to increase during the progressing bloom.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02114686
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Feeding of calanoid copepods in relation to Phaeocystis pouchetii blooms in the German Wadden Sea area off Sylt (1983)
    Springer
    Marine biology 74 (1983), S. 87-94 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Population dynamics of the dominant calanoid copepods Acartia spp. and Tempora longicornis were followed during a dense spring bloom of Phaeocystis pouchetii in the northern Wadden Sea off Sylt. Positive correlations between algal concentration and abundance of the copepod species suggest that P. pouchetii constitutes an important food organism for the copepods in spring and early summer. In laboratory experiments, feeding and ingestion rates of A. clausi and T. longicornis were determined when P. pouchetii colonies were offered as food. Maximum food intake reached 48% of body carbon per day in A. clausi and 87% in T. longicornis, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394279
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  • 5
    Electronic Resource
    Electronic Resource
    Is the ‘microbial loop’ an early warning indicator of anthropogenic stress? (1989)
    Springer
    Hydrobiologia 188-189 (1989), S. 163-174 
    Details
    ISSN: 1573-5117
    Keywords: microbial loop ; indicator ; stress ; contaminants ; nutrients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Various components of the ‘Microbial loop’ such as bacteria, heterotrophic nanoflagellates and autotrophic picoplankton were analyzed, for the first time across the Great Lakes, during a cruise in the summer of 1988. In addition, the size fractionated primary productivity using carbon-14 techniques was also determined. The statistical analysis indicated that bacteria, autotrophic picoplankton and ultraplankton/picoplankton productivity were significantly higher in Lakes Ontario and Erie than Lakes Huron and Michigan. The autotrophic picoplankton and ultraplankton/picoplankton productivity was higher in Lake Erie compared to Lake Ontario. The autotrophic picoplankton showed sensitivity to nutrients and contaminants in various types of environments. A dramatic decrease of autotrophic picoplankton in eutrophic-contaminated areas, such as Ashbridges Bay, Hamilton Harbour and western Lake Erie was observed. Conversely, in Saginaw Bay, another eutrophic environment, the autotrophic picoplankton were significantly higher than in Lake Huron. The sensitivity of autotrophic picoplankton to nutrients/contaminants might have implications to trophic interactions. Our results suggest that structural and functional characteristics of the ‘microbial loop’ may be operating differently in stressed versus unstressed ecosystems. The possibility of using autotrophic picoplankton as an early warning indicator of environmental perturbation is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027782
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Excretion and respiration rates of Neomysis integer (Mysidaceae): effects of temperature, sex and starvation (1989)
    Springer
    Hydrobiologia 178 (1989), S. 253-258 
    Details
    ISSN: 1573-5117
    Keywords: respiration ; excretion ; starvation ; Neomysis integer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The combined effects of temperature, sex and length of pre-experimental starvation period on respiration, ammonia and inorganic phosphate excretion of the mysid shrimp Neomysis integer were studied in laboratory experiments. Of these variables, temperature had the strongest effect. A rise in experimental temperature from 6 to 16 °C increased the metabolic rates by a factor of 2 to 3. Weight-specific respiration rates of females were slightly lower than those of males. However, these differences could be attributed to differences in size. Sex did not significantly affect ammonia and inorganic phosphate excretion. A prolongation of the pre-experimental starvation period from 6 to 30 h reduced ammonia excretion of Neomys integer, but had no impact on oxygen consumption rates. Accordingly, the atomic O : N ratio increased in starved specimens. There were no discernables effects of the variables studied on atomic O : P and N : P ratios.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006032
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Metabolism measurements ofAurelia aurita planulae larvae, and calculation of maximal survival period of the free swimming stage (1985)
    Springer
    Helgoland marine research 39 (1985), S. 43-47 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Respiration, ammonia and phosphate excretion experiments were performed with planula larvae ofAurelia aurita (Scyphozoa) from Kiel Fjord, Baltic Sea, in summer 1983. The mean respiration measured was 3.22 nl O2 ind−1 h−1 (at ∼ 20 °C). Excretion experiments revealed average values of 11.41 pM NH4-N ind−1, and 0.92 pM PO4-P ind−1h−1, respectively. The atomic C:N:P ratio of excretion products was 133:10:1. The O:N ratio of 25:1 and O:P ratio of 313:1 point to a lipid-carbohydrate-oriented catabolism of theAurelia larvae. On the basis of experimental results and of biomass determinations, the maximal survival period of the non-feeding free swimming planula stage was calculated. Typically, the value lies in the range of some days to one week.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01997518
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Die Temperaturabhängigkeit des Wachstums vonPhaeocystis pouchetii (Haptophyceae) in Batchkulturen (1985)
    Springer
    Helgoland marine research 39 (1985), S. 201-211 
    Details
    ISSN: 1438-3888
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Temperature dependent growth rates ofPhaeocystis pouchetii (Haptophyceae) were investigated in 5–1 batch cultures. The algae had been isolated from the German Wadden Sea area off Sylt. Microscopic cell counts and fluorescense measurements yielded similar results. The growth ofP. pouchetii reveals a typical optimum curve between 7 °C and 20 °C. Maximal growth rates, 3 divisions per day, were obtained at 15 °C. At 5 °C the algae cultures survived, but multiplication of the cells almost ceased. Results of the culture experiments correspond with observations made onPhaeocystis blooms at the German North Sea coast.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01997450
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    The significance and future potential of using microbes for assessing ecosystem health: The Great Lakes example (1994)
    Springer
    Journal of aquatic ecosystem stress and recovery 3 (1994), S. 295-310 
    Details
    ISSN: 1573-5141
    Keywords: bacteria ; picoplankton ; heterotrophic nanoflagellates ; ciliates ; nanoplankton ; food web
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An overview of current status of microbial research in the Great Lakes consisting of structural, toxicological, and cytological aspects is presented. A variety of techniques for the identification and enumeration of food-web parameters such as bacteria, autotrophic picoplankton, heterotrophic nanoflagellates, ciliates, and various size fractions of phytoplankton have been evaluated. An extensive lakewide survey of the Great Lakes conducted in 1991 indicated high bacterial abundance in Lake Erie and the Detroit River, and lowest numbers in the oligotrophic Georgian Bay and Lake Superior. The autotrophic picoplankton were lowest in the contaminated ecosystems of the Detroit River, St. Clair River, and Lake St. Clair. This persistent sensitivity of the autotrophic picoplankton to environmental perturbation make them ideal candidates as early warning indicators of ecosystem health. This is the first time that such a comprehensive strategy has been attempted encompassing all important components of the microbial food-web in the Great Lakes. These results clearly demonstrate the significance and potential of microbes in providing a multi-trophic, dynamic, and holistic picture of the aquatic ecosystems. Furthermore, the necessity of monitoring microbial food-web parameters is recommended and emphasized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00115288
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    Paper (German National Licenses)
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  • 10
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    Significance of picocyanobacteria in the Red Sea and the Gulf of Aden (1992)
    In:  EPIC3Bot Mar, 35, pp. 245-250
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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