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  • 1
    Call number: MR 90.0133
    Type of Medium: Monograph available for loan
    Pages: V, 171 S.
    Language: German
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
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    Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung
    Associated volumes
    Call number: ZSP-168-592
    In: Berichte zur Polar- und Meeresforschung
    Type of Medium: 12
    Pages: Online-Ressource.
    Series Statement: Berichte zur Polar- und Meeresforschung 592
    Language: English
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 3
    Series available for loan
    Series available for loan
    Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung
    Associated volumes
    Call number: ZSP-168-39
    In: Berichte zur Polarforschung
    Type of Medium: Series available for loan
    Pages: 259 S. : graph. Darst., Kt.
    ISSN: 0176-5027
    Series Statement: Berichte zur Polarforschung 39
    Language: English
    Location: AWI Reading room
    Branch Library: AWI Library
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  • 4
    Call number: AWI Bio-06-0531
    Type of Medium: Monograph available for loan
    Pages: 462 S. : zahlr. Ill., graph. Darst.
    ISBN: 3897573105
    Branch Library: AWI Library
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Organometallics 13 (1994), S. 4649-4651 
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-0517
    Keywords: Key words Comparability ; Traceability ; Isotope-specific methods ; Isotope dilution mass spectrometry ; Neutron-activation analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  In the seventh round of the Institute for Reference Materials and Measurements' International Measurement Evaluation Programme, 277 clinical laboratories from 17 countries participated. The measurands consisted of inorganic components, present at minor and trace level, in a human liquid serum. Results for calcium, chloride, copper, magnesium, sodium, selenium and zinc are reported and are compared to reference values established mainly by isotope dilution mass spectrometry and neutron-activation analysis. The overall conclusion is that routine measurements of total concentrations of the components by clinical laboratories are of high quality. The fraction of significant errors is small (0.5%) and the self-declared uncertainty values are generally fairly realistic. Results are further commented on with respect to the recent development in metrology in chemistry.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The abundance, vertical distribution and population structure of two important small calanoid copepod species, Microcalanus pygmaeus (G. O. Sars) and Ctenocalanus citer Heron and Bowman, were studied in the eastern Weddell Sea in summer (January/February 1985), in late winter/early spring (October/November 1986) and in autumn (April/May 1992). The population of Microcalanus pygmaeus consisted mainly of copepodite stages CII and CIII in late winter/early spring and were concentrated between 500 and 200 m depth. In summer, stage CIV was the modal stage and the bulk of the population had ascended above 300 m. In autumn the population structure was bimodal with CI and CV dominating. Most of the population was concentrated between 300 and 200 m. In all investigation periods M. pygmaeus had their maximal concentrations in the thermo-pycnocline. The developmental stages CIII to CV of Ctenocalanus citer formed the bulk of the population in late winter/early spring. In October all developmental stages had their main distribution between 500 and 200 m, except females, which were concentrated in the upper 50 m. In November most of the population occurred between 200 and 50 m. The summer population was concentrated in the upper 50 m, and numbers increased dramatically as the new cohort hatched. Copepodite stages CII and CIII dominated the population at the end of January, while CIV dominated 2 wk later. In autumn, CV was the modal stage. The majority of the population was concentrated in the upper 100 m, but there was an increase in abundance below 300 m compared to summer. Age structure changed with depth with a younger surface population and an older one in deeper water layers. The seasonal change in number of M. pygmaeus is much smaller than that of C. citer; the summer:winter:autumn ratio of the former being about one, whereas the winter:summer/autumn of the latter was about nine. Early copepodite stages and adults of M. pygmaeus occurred throughout all investigation periods. The large proportion of early copepodite stages in April and in mid-October suggests autumn and early to midwinter breeding. Apparently, M. pygmaeus may reproduce and grow year-round or perhaps has a 2-yr life-cycle. In contrast, the dramatic increase in abundance of early copepodite stages of C. citer in summer suggests springtime reproduction.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 104 (1990), S. 419-426 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sex-ratios of the limpetPatella kermadecensis Pilsbry, collected at three times of the year during 1984 and 1985 at Raoul Island in the Kermadecs group, varied with the size of the limpets. Small limpets were predominantly male, while amongst larger ones about half were female. The presence of hermaphroditism inP. kermadecensis was confirmed by microscopic examination of gonad material from over 50 limpets, which revealed a high percentage of individuals with both male and female gametes in their gonads. It is postulated that protandric sex change occurs in this large limpet, and that this phenomenon is related to a change in habitat from the backs of large shells (limpets less than approximately 50 mm) to bedrock (larger limpets). The pattern of sex change inP. kermadecensis is compared with that in other species of limpet, and it is suggested that a reproductive system consisting of gonochoristic males and sequential hermaphrodites may be particularly advantageous for a large, slow-growing species that has a very restricted geographical range.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 116 (1993), S. 81-86 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ageing of abalone by counting rings laid down internally in the shell has presented problems of validation. Three methods of tetracycline marking were tested in Haliotis iris. Juvenile (〈70 mm shell length) and adult (〉115 mm) abalone were injected intramuscularly with tetracycline hydrochloride, injected with oxytetracycline, or immersed in tetracycline hydrochloride. After treatment, shells were cut sagitally and examined under ultraviolet light using a stereomicroscope. In treatments where juveniles were injected with tetracycline hydrochloride or oxytetracycline hydrochloride at dosages ranging from 20 to 600 mg per kg body weight, no fluorescent marks were visible from treatments≤80 mg/kg, but 83% of juveniles treated with greater dosages retained a visible mark. In treatments where juveniles were immersed in seawater solutions of tetracycline hydrochloride at five concentrations ranging from 200 to 1000 mg per litre of seawater and sampled at 5 h intervals for periods ranging from 5 to 40 h, all showed clear fluorescent markings. Shells of adult abalone injected with tetracycline hydrochloride at four dosages ranging from 200 to 800 mg/kg all showed clearly visible marks 18 d post-treatment. Abalone injected at dosages of 600 and 800 mg/kg exhibited tissue fluorescence around the injection site 2 wk after treatment. Adults immersed for 48 h at four concentrations ranging from 200 to 800 mg/l produced marks comparable to those of injected adults. Abalone were clearly stressed by some treatments. Only 50% of adults injected at 200 mg/kg were able to right themselves within 10 min, while all those injected at higher concentrations either were incapable of righting themselves after treatment or were extremely sluggish. All immersed adults quickly righted themselves. These results show that both injection and immersion are effective in marking abalone, but that immersion is less stressful to them.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Marine biology 130 (1998), S. 479-489 
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This study investigates the reproductive periodicity and reproductive output of the seagrass Zostera novazelandica on two intertidal reefs. Peak numbers of flowering shoots occurred during March (late summer) of two years at both sites and no flowering shoots occurred during the winter months of July to September. There were greater numbers of flowering shoots in seagrass patches in the low intertidal zone (up to an average of 55 per 0.1 m2) compared to the middle (up to 20 per 0.1 m2) and upper (up to 9 per 0.1 m2) zones, and about three times greater reproductive output in patches associated with tidepools compared to those not bordering tidepools. The average number of inflorescences per shoot was 3.1 (±0.25) at one site vs 1.2 (±0.08) at the other, and showed a progressive decrease from the lower shore to the upper shore. Patches associated with tidepools had twice the number of inflorescences per shoot (2.8 ± 0.24) than patches not bordering tidepools (1.5 ± 0.16). The number of flowering shoots was highly correlated with leaf width, leaf length, and ramet density, while the leaf-area index decreased from the lower shore to the upper shore. The reproductive effort of plants, as measured by the percent biomass invested in flowering shoots during peak reproduction, was significantly different between sites, tidepool associations, and shore level. For all the variables measured, there was considerable spatial variation, with significant interaction terms between most factors investigated. In laboratory experiments, more inflorescences were produced at light intensities of 30 and 300 μE m−2 s−1 than at 100 μE m−2 s−1. At a salinity of 17‰, 1.5 × the number of flowers was produced than at 33‰, while none was formed at 70‰. Plants cultured at 5 °C had about three times the number of inflorescences than those at 15 °C, while none was formed at 25 °C.
    Type of Medium: Electronic Resource
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