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  • 1
    Electronic Resource
    Electronic Resource
    Competitive interactions and substratum preferences of two intertidal isopods (1975)
    Springer
    Marine biology 30 (1975), S. 21-25 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The intertidal isopods Gnorimosphaeroma oregonensis oregonensis (Dana) and Exosphaeroma amplicauda (Stimpson) are shown to have differing preferences for substratum particle-size categories. In field sampling, 80.9% of the total number of G. oregonensis oregonensis taken were present on substrata falling within a ϕ-4.2 to-3.8 diameter size-range, while 60.0% of E. amplicauda occupied the range ϕ-2.5 to-2.1. These relationships changed upon laboratory manipulation of density ratios, and suggest competitive interaction: when E. amplicauda is tested alone, the resultant preference assumes a greater niche breadth and overlap to that of the field. Introduction of G. oregonensis oregonensis produces a displacement of E. amplicauda, the degree being dependent upon their relative numerical strength. With an experimental ratio of 3:1 (G. oregonensis:E. amplicauda) there is a simulation of field densities, and the laboratory results approximate more closely the overlap in nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393749
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of an intertidal population of the amphipod Gammarus palustris using a modified version of the egg-ratio method (1975)
    Springer
    Marine biology 33 (1975), S. 323-330 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An intertidal population of Gammarus palustris Bousfield was sampled over a 23-month period and analyzed by a modified form of the egg-ratio method. Total numbers and size-frequency distributions revealed small numbers in the early spring which later increased to a peak in the summer months. This was followed by a marked reduction near the end of sumer and a subsequent rise in numbers during the early fall. Finally there was a second decrease to very low numbers in the late fall and early winter. Average brood size was calculated and used as an indication of food limitation. Attempts to correlate this with per capita rate of change (r), birth rate ( $$(\hat b)$$ and death rate ( $$(\hat d)$$ ) suggested that the population increase in the early summer was food-rather than predator-limited. The late summer decline appears to be the result of predation pressure as well as food limitation. The fall peak is attributed to juvenile release from ovigerous femals escaping previous predation and to an increase in adult males resulting from a release in predation pressure. The winter decline may be due to adverse environmental conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390570
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  • 3
    Electronic Resource
    Electronic Resource
    Calanus finmarchicus and Related Forms (1953)
    [s.l.] : Nature Publishing Group
    Nature 171 (1953), S. 1163-1164 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the early spring of 1952, in Tromso Sound, northern Norway, the majority of female Calanus caught were finmarchicus; no helgolandicus was found. About 10 per cent, however, laid eggs of the same size as helgolandicus; but these, shortly after laying and before the first cleavage, produced a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1711163b0
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  • 4
    Electronic Resource
    Electronic Resource
    Avidity of the Tetracyclines for the Cations of Metals (1956)
    [s.l.] : Nature Publishing Group
    Nature 177 (1956), S. 433-434 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Ionization Constants. Tetracycline hydrochloride, dried for an hour in air at 110, was dissolved (0-001 M) in boiled-out water and titrated potentio-metrically under nitrogen with three equivalents of 0 o 1 N potassium hydroxide added in thirty equal portions. This gave the three ionization ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/177433a0
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  • 5
    Electronic Resource
    Electronic Resource
    Destruction of Isoniazid in the Presence of Hæmin (1955)
    [s.l.] : Nature Publishing Group
    Nature 175 (1955), S. 1085-1086 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] When isoniazid (10~2 M) and haemin (10-3 M) were shaken with air at 20 (pH 7-5, phosphate or 'tris' buffer) only two substances were formed : diiso-nicotinoylhydrazine (I) and isonicotinic acid (II). Under these conditions, (I) was not formed from the reaction of isoniazid with (II), as has been ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1751085b0
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  • 6
    Electronic Resource
    Electronic Resource
    Distribution of the Polychéte Ophelia cluthensis McGuire (1938)
    [s.l.] : Nature Publishing Group
    Nature 142 (1938), S. 576-577 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Ophelia cluthensis was described in 1935 by McGuire1, who obtained her specimens from Millport in the Clyde, and more fully in 1938 by Brown2. It occurs in a narrow zone of sandy beaches just below high-water mark neaps, frequently to the extent of several hundred ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/142576b0
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  • 7
    Electronic Resource
    Electronic Resource
    Studies of diffusion and flow by pulsed NMR techniques
    Amsterdam : Elsevier
    Advances in Molecular Relaxation Processes 3 (1972), S. 119-131 
    Details
    ISSN: 0001-8716
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0001-8716(72)80029-4
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  • 8
    Electronic Resource
    Electronic Resource
    Studies of diffusion and flow by pulsed NMR techniques
    Amsterdam : Elsevier
    Advances in Molecular Relaxation Processes 3 (1972), S. 119-131 
    Details
    ISSN: 0001-8716
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0001-8716(72)80029-4
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  • 9
    Electronic Resource
    Electronic Resource
    Critical flow velocities for the growth and dominance of Anabaena circinalis in some turbid freshwater rivers (2003)
    Oxford, UK : Blackwell Science Ltd
    Freshwater biology 48 (2003), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY 1. From measurements at several weir pool sites along the turbid and freshwater Barwon-Darling River, Australia, the development of persistent stratification (for periods of 〉5 days) was related to river discharge. For the sites examined, the required discharge to allow the development of persistent stratification was between 100 and 450 ML day−1 during the hotter months. High discharge during the hotter months did not allow the formation of persistent stratification, although diel stratification did occur. Low discharge through the cooler months resulted in diel stratification, although persistent stratification lasting for a few days could occur at times.2. The growth and dominance of Anabaena circinalis at these sites was closely related to the establishment and maintenance of persistent and strong thermal stratification. Growth only occurred during extended periods (〉5 days) of persistent stratification. These conditions not only restrict the displacement of A. circinalis downstream, they also allowed the alga to accumulate in surface waters.3. The discharge levels required to suppress the formation of persistent stratification at the study sites were variable because of large differences in channel cross-sectional area. To compensate for this variation, the discharges were converted to flow velocities. A critical velocity of 0.05 ms−1 was sufficient for the suppression of persistent thermal stratification and concurrent A. circinalis growth for all sites. The turbulent velocity (u*) under weak wind mixing at the study locations varied between 2.66 × 10−3 and 2.91 × 10−3 ms−1 at the critical flow velocities. These values may have potential to be applied to other rivers in similar climatic zones to suppress nuisance cyanobacterial growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.2003.00957.x
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  • 10
    Electronic Resource
    Electronic Resource
    Pulsed current measurement of the resistive transition and critical current in high Tc superconductors (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 984-987 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A pulsed current technique for measuring the critical transport properties of superconductors as a continuous function of current or temperature is described. Greatly reduced sample heating permits investigation of both the "weak link'' and intrinsic properties of granular superconductors. Results obtained for various high Tc oxide superconductors provide an example of the technique's application. Both intergranular and intragranular critical current densities are extracted from the data. Current-voltage measurements using the pulse method are corroborated by traditional dc measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141204
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