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  • 1
    Electronic Resource
    Electronic Resource
    Calanoid resting eggs in the Baltic Sea: implications for the population dynamics of Acartia bifilosa (Copepoda) (1992)
    Springer
    Marine biology 114 (1992), S. 397-405 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Resting eggs of Acartia spp. (presumably A. bifilosa Giesbr.) at densities between 65 and 125 eggs cm-2 were found in sediment off the southern coast of Finland and represent the first observations of dormant calanoid eggs in the Baltic Sea. The highest egg densities were found at sediment depths between 4 and 8 cm. The hatching percentage varied between 0 and 90% in the different sediment layers and at different experimental temperatures (13, 16 and 19°C). Some nauplii emerged from the eggs extracted from sediment layers 9 to 10 cm beneath the surface layer and other nauplii emerged from eggs after 82 d of dark storage at 3°C. Light was not needed to trigger hatching; the nauplii were able to hatch in darkness when the eggs were resuspended in filtered seawater. Indirect evidence suggests that the marked spring peak of Acartia spp. nauplii seen in a monitoring data from the years 1973 to 1984 was derived from benthic eggs and not from spawning. The possible mechanisms for induction of hatching and the adaptive benefits of resting egg production for A. bifilosa are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00350030
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  • 2
    Electronic Resource
    Electronic Resource
    Mesozooplankton resting eggs in the Baltic Sea: identification and vertical distribution in laminated and mixed sediments (1994)
    Springer
    Marine biology 120 (1994), S. 455-466 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Benthic resting eggs of rotifers, cladocerans and calanoid copepods were studied at two sites with different hydrographical and sediment properties off the SW coast of Finland, the northern Baltic Sea between 1991 and 1993. Vertical distribution of the resting eggs in the sediment was studied down to 10 cm depth, and hatching of the eggs extracted from different 1-cm thick sediment layers was experimentally tested. The larvae of eight mesozooplankton taxa emerged from the eggs: Calanoida (mostlyAcartia bifilosa), cladoceransBosmina spp.,Daphnia spp.,Evadne nordmanni, andPodon spp. (mostlyP. polyphemoides), and rotifersSynchaeta spp.,Keratella spp. andAsplanchna priodonta. Some calanoid and cladoceran eggs hatched after 7 mo storage of the sediment at 3°C. A few calanoid and cladoceran eggs hatched from the 8 to 10 cm deep sediment layer. Their age, estimated by means of137Cs analysis, was ca. 8 to 10 yr. Vertical distribution of the benthic eggs reflected the different sediment structures of the study sites. The eggs of all zooplankton taxa were more stratified in the laminated sediment than in the disturbed sediment. We suggest that the intensity of deep water mixing is the key factor for regulating the vertical distribution and hatching probability of mesozooplankton resting eggs, since it largely determines the stratification of the sedimenting material, distribution of oxygen within the sediment, and the living conditions of benthic animals causing bioturbation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00680221
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  • 3
    Electronic Resource
    Electronic Resource
    Seasonal and long-term variations in the body size of planktonic copepods in the northern Baltic Sea (1995)
    Springer
    Marine biology 123 (1995), S. 241-250 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Seasonal and long-term variations in the body size of planktonic copepods were studied in the northern Baltic Sea. The influence of temperature, salinity and phytoplankton concentration to the body size of Eurytemora affinis, Acartia bifilosa and Limnocalanus macrurus (Calanoida) was examined at three sea areas, differing in their hydrographical and trophic conditions (an archipelago area and an enclosed bay on the SW coast of Finland in 1992 and at an open sea station in the Gulf of Bothnia in 1991). There was an inverse relationship between copepod body length and temperature, while there was a direct effect of phytoplankton concentration. According to multiple regression analysis, the relative importance of these factors varied according to species, developmental stage and study area. In the archipelago area, copepod body size was mainly determined by temperature, while in the open Gulf of Bothnia, phytoplankton concentration was usually more important. Interannual variation in the summer body length of E. affinis and A. bifilosa was examined using samples collected over 18 years (1967 to 1984) in the archipelago area. In this analysis, the inverse relationship between water temperature and copepod body size disappeared; in E. affinis the average female length correlated positively with summer temperature. We suggest that the length and timing of the study period greatly influence the investigator's view of the factors regulating copepod body size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00353615
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  • 4
    Electronic Resource
    Electronic Resource
    Food utilisation of pelagic mysids, Mysis mixta and M. relicta, during their growing season in the northern Baltic Sea (2000)
    Springer
    Marine biology 136 (2000), S. 553-559 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The dietary habits of the pelagic mysid Mysismixta were studied during its growing season at an open sea location in the Gulf of Finland, the northern Baltic Sea. Stomach samples were taken twice a month from June to September 1997. The most abundant phytoplankton taxa in the stomachs were diatoms and dinoflagellates, and copepods and cladocerans were the most abundant zooplankton identified. A clear change was found in the diets during the study period. Small mysids (3 to 6 mm) fed on sedimented phytoplankton in the early summer (90% benthic particles in June) but shifted gradually to a more pelagic and carnivorous diet (〉40% pelagic particles, consisting of ca. 60% zooplankton in September). Seasonal changes in mysid capture ability as well as food availability were suggested to affect the diet composition of mysids during their growth. The ratio of pelagic and benthic food particles could – irrespective of the season – be explained by mysid size, whereas the zooplankton:phytoplankton ratio was better explained by season. The stomach analysis suggests that the mysids needed to attain a threshold size of 8 to 11 mm to initiate feeding on the more evasive copepods. Mysids also started to grow faster at the same time as the proportion of copepods increased in the diet, which suggests that copepods are an important energy source for M. mixta in late summer. Finally, a comparison was made between the M. mixta diet and that of the less abundant M. relicta. The diets of the two pelagic mysid species overlapped by 75% (Schoener's index). The main difference was due to M. mixta eating more zooplankton and pelagic material than M. relicta.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050715
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  • 5
    Electronic Resource
    Electronic Resource
    Itraconazole prevents terfenadine metabolism and increases risk of torsades de pointes ventricular tachycardia (1993)
    Springer
    European journal of clinical pharmacology 45 (1993), S. 191-193 
    Details
    ISSN: 1432-1041
    Keywords: Torsades de pointes ; Terfenadine ; Itraconazole ; QT-interval ; drug-interaction ; pharmacokinetics ; drug metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Terfenadine, a nonsedating H1-selective antihistamine, is widely used in many countries. We report pharmacokinetic results in a patient who developed a prolonged QT-interval in ECG and symptomatic torsades de pointes ventricular tachycardia as a consequence of the interaction of itraconazole and terfenadine. Both drugs were taken in the recommended doses: terfenadine 60 mg b.d. and itraconazole 100 mg b.d. Terfenadine metabolism was delayed by itraconazole, leading to an increased level of unmetabolised terfenadine. Seven weeks after the cessation of itraconazole treatment, terfenadine was rapidly metabolized to its active metabolite and did not prolong the QT-interval when given as a single provocation dose (120 mg). The findings suggest that intraconazole in therapeutic doses inhibits terfenadine metabolism. It is also possible that unmetabolised terfenadine alone, without an increased level of its active metabolite, may cause torsades de pointes. The concomitant use of terfenadine and itraconazole (and ketoconazole) should be avoided.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315505
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  • 6
    Electronic Resource
    Electronic Resource
    Growth of pike larvae (Esox lucius) under different conditions of food quality and salinity (2005)
    Oxford, UK : Munksgaard International Publishers
    Ecology of freshwater fish 14 (2005), S. 0 
    Details
    ISSN: 1600-0633
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract –  We measured growth of pike larvae (Esox lucius) fed with freshwater and brackish-water zooplankton by monitoring larval wet weight during 18 days. The fish food was analysed for species composition, carbon, nitrogen and fatty acids. Further, we analysed fish larval faecal pellet production. Larval weight was significantly higher in fresh water than in brackish water with natural zooplankton as food. Growth, given as wet weight, showed a significant relationship with zooplankton (〉100 μm) food carbon and highly unsaturated fatty acids, 20:5ω3, 22:6ω3, ω6 fatty acids and the ω3/ω6 fatty acid ratio. Phytoplankton fatty acids (10–50 μm), such as polyunsaturated fatty acids, 20:5ω3, 22:6ω3 and the ω3 fatty acids also correlated strongly with the wet weight of pike larvae. We demonstrated that several factors impact on pike larval growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0633.2005.00113.x
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  • 7
    Electronic Resource
    Electronic Resource
    Use of back-scattering in elemental analysis
    Amsterdam : Elsevier
    The @International Journal Of Applied Radiation And Isotopes 23 (1972), S. 315-320 
    Details
    ISSN: 0020-708X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0020-708X(72)90009-9
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  • 8
    Electronic Resource
    Electronic Resource
    An investigation of excited states in32S by the31P(p, γ)32S reaction (1974)
    Springer
    The European physical journal 269 (1974), S. 173-179 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The31P(p, γ)32S reaction has been studied in the proton energy region 300–1420 keV using Ge(Li)-techniques. Gamma decay schemes of 16 resonances are proposed. The branching ratios of the resonance states and 23 bound states are presented. The spin of theE x=7116 keV level was found to beJ π=2+. In addition, the present results are compared with earlier ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01669059
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  • 9
    Electronic Resource
    Electronic Resource
    A study of the excited states of23Na from the22Ne(p, γ)23Na reaction (1971)
    Springer
    The European physical journal 247 (1971), S. 400-407 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The gamma decays of 1922Ne(p, γ)23Na resonances in the range ofE p =400−1300 keV have been investigated by means of a 38 cm3 Ge(Li) detector. Branching ratios of the resonances and bound states were determined. Gamma-ray energy measurements yield the energies of 19 bound states and the value of 8794.0±1.5 keV forQ. The existence of the 3913 keV doublet state was studied through the (p, γ) reaction. No evidence for such a doublet was found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01395339
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  • 10
    Electronic Resource
    Electronic Resource
    Angular distribution measurements of gamma-rays from the22Ne(p, γ)23Na reaction (1972)
    Springer
    The European physical journal 250 (1972), S. 387-394 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Angular distribution measurements of gamma-rays from the22Ne(p, γ)23Na reaction on theE p =897, 1006, 1091 and 1278 keV resonances have been made. Spin and parity assignments for several bound states are presented together with multipole mixing ratios for transitions from resonance and bound states. The level at 6617 keV (7/2+) is proposed to be a member of the rotational band based on the Nilsson orbit 5(K π=5/2+).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01379751
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