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  • Springer  (73)
  • American Meteorological Society (AMS)
  • 1985-1989  (65)
  • 1940-1944  (8)
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  • 1
    ISSN: 1439-0361
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Summary A spell of frost of 30 days in February/March 1986 caused a high mortality (5–6%) among wintering Oystercatchers on Texel, NL. Anatomical deformations were found in 67% of the frost victims, especially on bill and legs. 60,7% of the frost victims were younger than 1 year and only 8,3% were adults. The mean weight of the 86 victims was about 36% less than the mean normal winter-weights.
    Notes: Zusammenfassung Nach einer 30tägigen Frostperiode im Februar/März 1986 konnten auf der niederländischen Wattenmeerinsel Texel 86 tote Austernfischer untersucht werden. 67% aller Totfunde wiesen Deformationen an Schnäbeln und Beinen auf. 60,7% waren Vögel im ersten Lebensjahr. Der Anteil adulter betrug 8,3%. Die Totfunde wiesen ein Untergewicht von 36% auf. Insgesamt dürften 5–6% des Winterbestandes auf Texel dem Frost zum Opfer gefallen sein.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 38 (1988), S. 1-1 
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 44 (1988), S. 40-42 
    ISSN: 1420-9071
    Keywords: TRH ; TRH analogues ; thermogenesis ; brown adipose tissue
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Acute or chronic injection of RX 77368 (a TRH analogue; 1 mg/kg s.c.) stimulated oxygen consumption (VO2) and brown adipose tissue activity in the rat, and decreased weight gain Other TRH analogues (CG 3509, RGH 2202) and TRH itself also stimulated VO2. These thermogenic actions are probably mediated centrally by stimulation of sympathetic outflow to brown fat.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Archiv der Mathematik 47 (1986), S. 408-409 
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal for general philosophy of science 16 (1985), S. 304-314 
    ISSN: 1572-8587
    Source: Springer Online Journal Archives 1860-2000
    Topics: Philosophy , Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Summary The method of citation analysis has been elaborated by E. Garfield for the purpose of documentation of scientific literature. The data accumulated in “Citation Indices” can also be used as an empirical basis for certain investigations in the field of science of science. Techniques of citation analysis (e.g. the calculation of citation rates or the co-citation-analysis) permit measurements of information activities of scientists. We refuse overdrawn interpretations of the results of citation analyses, for instance the indication of “scientific quality” or of “thematico-technical relations between ideas, problems etc.”.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-0983
    Keywords: Plant mitochondrial DNA ; Restriction enzyme analysis ; rRNA genes ; Tomato cell suspension cultures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Mitochondrial DNA (mtDNA) from Lycopersicon esculentum was purified from cell suspension cultures. The DNA, isolated from mitochondria purified by two successive sucrose density gradients, was uncontaminated with nuclear DNA or DNA from proplastids. The total molecular weights of BamHI, BglI, and BglII fragments indicate a mitochondrial genome size of at least 270 kb. Cross hybridization between tomato mtDNA and cloned spinach plastid genes revealed some homology. In hybridization experiments using cloned mitochondrial rRNA genes and BamHI digested total mtDNA the presence of recombination repeats is demonstrated.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 30 (1942), S. 128-136 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary (L) We have completed different points of our former paper on the micro-determination of very small quantities of Hg, and especially for the analyses of pure HgCl2 solutions, and the case when Hg is present in the laboratory atmosphere. It is added: That the excess of chlorine is eliminated by hydroxylamine instead of by heating. Electrolysis can be carried out even if the HCl concentration or the volume of the electrolyte (up to 100 ccm.) is great. If one keeps to the known precautions in the distillatio nof Hg, the determination of the smallest quantities of Hg, below 0,1γ, can be done with sufficient accuracy even without cooling the receptor by liquid air. The determination of Hg in the reagents HCl, KClO3 and hydroxylamine hydrochloride is given. The lately issued paper ofReith andvan Dijk on a microanalytical determination of Hg with dithizon is discussed.
    Abstract: Résumé (W) Nous complétons les prescriptions que nous avons déjà données pour le microdosage de très petites quantités de mercure; et ceci pour diverses raisons, notamment dans le cas d'analyses de solution de HgCl2 pur, ou d'analyses conduites dans une atmosphère contenant de la vapeur de mercure. Il faut relever les faits suivants: l'excès de chlore n'est plus éliminé par chauffage, mais au moyen d'hydroxylamine. L'électrolyse peut être conduite sans inconvénient en présence d'une importante quantité d'HCl et dans un volume plus considérable de l'électrolyte (jusqu'à 100 cmc.). En observant certaines précautions, lors de la distillation du mercure, on parvient à doser avec assez d'exactitude de très petites quantités de mercure, inférieures à 0,1γ, et cela sans refroidir le récipient avec de l'air liquide. On donne un procédé simple de détermination du mercure dans les réactifs nécessaires, HCl, KClO3 et chlorhydrate d'hydroxylamine. Il est fait mention d'un récent article deReith etvan Dijk sur un microdosage du mercure au moyen de la dithizone.
    Notes: Zusammenfassung Unsere früheren Vorschriften für die mikrometrische Bestimmung kleinster Hg-Mengen werden in verschiedener Hinsicht ergänzt, insbesondere für die Analyse reiner HgCl2-Lösungen und für den Fall, daß die Luft im Arbeitsraum Hg-haltig ist. Hier sei hervorgehoben: Das überschüssige Cl wird statt durch Erwärmen mit Hydroxylamin beseitigt. Die Elektrolyse ist auch bei größerem HCl-Gehalt und größerem Volum des Elektrolyten (bis zu 100 ccm) anstandslos durchzuführen. Unter Einhaltung gewisser Vorsichtsmaßregeln beim Abdestillieren des Hg läßt sich die Bestimmung der kleinsten Hg-Mengen, unter 0,1γ, auch ohne Kühlen der Vorlage mit flüssiger Luft genügend genau vornehmen. Es werden einfache Verfahren zur Hg-Bestimmung in den benötigten Reagenzien HCl, KClO3 und Hydroxylaminhydrochlorid angegeben. Die kürzlich erschienene Arbeit vonReith undvan Dijk über eine mikroanalytische Bestimmung des Hg mit Dithizon wird besprochen.
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  • 9
    ISSN: 1432-1939
    Keywords: Allocation patterns ; Restionaceae ; Nitrogen ; Dry mass ; Fynbos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The annual growth pattern of male plants of the endemic, dioecious fynbos species, Thamnochortus punctatus, revealed sequential growth of the various below-and above-ground organs. Root and rhizome development were favoured in the wet winter months while culm elongation occurred in the warmer but drier spring to summer period. The reproductive phase of development followed in the hot dry summer and autumn. The asynchronous pattern of growth is suggested to enable the plant to maximize utilization of scarce resources within the confines of the environmental controls determined by the mediterranean-climate. Maximum root and rhizome activity in the rainy season enabled the plant to absorb and store nitrogen in mature culms for later above ground organ development. As the absorption of nitrogen from senscing material is essential for this pattern of organ development to assist in alleviating nutrient scarcity the high degree of nitrogen reabsorption, 35 to 70% for branches and culms respectively, shows the potential importance of asynchronous organ growth in overcoming nitrogen limitation of plant growth. Comparisons of dry mass and nitrogen allocation patterns indicate that developmental strategies employed by evergreen, perennial plants in climatically and edaphically constrained environments cannot be deduced from biomass allocation patterns alone as they do not appear to reflect strategies evolved to overcome nutrient limitation.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Oecologia 81 (1989), S. 412-417 
    ISSN: 1432-1939
    Keywords: Myrmecochory ; Fynbos ; Regeneration ; Fire ; Nutrient
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Leucospermum conocarpodendron (L.) Buek (Proteaceae) seedlings were excavated several months after a fire in Cape fynbos. Seedlings under burnt parental skeletons had short hypocotyls (mean 25 mm) indicating passive dispersal whereas seedlings in the open were more deeply buried (mean 48 mm) by ants. Soil nutrient concentrations at the site of germination were negatively related to depth of burial and distance from parent. Ant dispersal resulted in seedlings emerging in soils with lower nutrient concentrations than passively dispersed seeds. Tissue analysis supported the soil results with lower P content in seedlings from open (ant dispersed) sites. Seedling survival in the first year of establishment was also lower in open sites, but not significantly so. However seedlings were slightly taller in the open. The results of this study, the first on naturally occurring intraspecific variation in myrmecochory, strongly contradict current explanations for the high incidence of myrmecochory in nutrient poor environments.
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