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  • 2000-2004  (10)
  • 1975-1979  (10)
  • 1930-1934  (1)
  • 1905-1909  (2)
  • 11
    Digitale Medien
    Digitale Medien
    High genetic variability in a population of Tridacna maxima from the Great Barrier Reef (1975)
    Springer
    Marine biology 33 (1975), S. 341-345 
    Details
    ISSN: 1432-1793
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A population of the bivalve mollusk Tridacna maxima (Röding) from Hron Island, Great Barrier Reef, Australia, was studied by gel electrophoresis, and proved to be highly variable genetically, with an average heterozygosity of about 22%. This compares closely with a population of T. maxima from Enewetak (Eniwetok) Atoll, with an average heterozygosity of about 20%, very high for marine organisms. Enewetak Atoll was the site of a series of nuclear tests. The Heron Island study verifies that the high variability is natural, and supports the hypothesis that species from trophically stable environments tend to be highly variable genetically.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00390572
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  • 12
    Digitale Medien
    Digitale Medien
    Minimal Presentations and Efficiency of Semigroups (2000)
    Springer
    Semigroup forum 60 (2000), S. 231-242 
    Details
    ISSN: 1432-2137
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: S is said to be efficient if it can be defined by a presentation (A | R) with |R| -|A|=rank(H 2(S)). In this paper we demonstrate certain infinite classes of both efficient and inefficient semigroups. Thus, finite abelian groups, dihedral groups D 2 n with n even, and finite rectangular bands are efficient semigroups. By way of contrast we show that finite zero semigroups and free semilattices are never efficient. These results are compared with some well-known results on the efficiency of groups.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002339910016
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  • 13
    Digitale Medien
    Digitale Medien
    A multiple regression model for blood lactate removal in man (1979)
    Springer
    Pflügers Archiv 380 (1979), S. 205-210 
    Details
    ISSN: 1432-2013
    Schlagwort(e): Lactate ; Muscle fibers ; Recovery exercise ; Bicycle ergometer ; Women
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract After exercise the lactate (La) removal from blood occurs significantly faster during moderate exercise than at rest. However, under both conditions there are considerable inter-individual differences in La removal. These differences in man may depend on the slow-twitch (ST) fiber content of muscle (X1), the La concentration in blood (X2), and the intensity of the recovery exercise (X3). Therefore, multiple regression models were obtained to describe La removal rates with these variables. In 10 women La concentrations were increased via a 6 min bicycle ergometer ride (87%VO2 max) and blood La concentrations were measured every 5 min during 20 min resting and active recovery periods (29–49%VO2 max). For resting recovery only the initial La concentration after the 6 min exercise provided a significant description for La removal in 8 subjects (P=0.03). However, for the active recovery a highly significant description for La removal was obtained: La removal rate (mM/l · min)=0.773×10−2X1+0.321×10−1X2−0.120×10−1X3+0.202 (R=0.91;P=0.01). The statistical independence (P〉0.10) of each of these variables in the model suggests that each is contributing uniquely to the total removal rate of La observed during an active recovery period. The relationship between La removal and %ST fibers may be related to the metabolic and anatomical features of these fibers, the La concentration probably reflects the significance of the mass action effect of La, and the intensity of exercise reflects the role of the muscle's metabolic rate. The present results illustrate that the removal of blood lactate is influenced by the interactive effects of the intensity of the recovery exercise, blood lactate concentration and the ST fiber content of muscle.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00582897
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  • 14
    facet.materialart.
    Unbekannt
    CONCENTRATION of a Force to Resist Raids or Invasion, Training, Organisation, and Rapid (lecture) (1908)
    London : Periodicals Archive Online (PAO)
    The RUSI journal. 52 Part 2 (1908:July/Dec.) 1612 
    Details
    ISSN: 0307-1847
    Thema: Politikwissenschaft
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:p225-1908-052-02-000008
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  • 15
    facet.materialart.
    Unbekannt
    FORTH and Clyde, Advantages, Strategical and Commercial, of a Battleship and Ocean-going Steamer Canal between the (lecture) (1909)
    London : Periodicals Archive Online (PAO)
    The RUSI journal. 53 Part 2 (1909:July/Dec.) 1415 
    Details
    ISSN: 0307-1847
    Thema: Politikwissenschaft
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:p225-1909-053-02-000008
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  • 16
    Digitale Medien
    Digitale Medien
    Particle-mediated gene transfer to rat neurons in primary culture (2000)
    Springer
    Pflügers Archiv 439 (2000), S. 730-738 
    Details
    ISSN: 1432-2013
    Schlagwort(e): Dorsal root ganglion neurons Gene gun Green fluorescent protein Hippocampal neurons Particle-mediated gene transfer Primary tissue culture Transfection
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract. Gene transfer into neuronal cells provides an important approach to study their function. Particle-mediated gene delivery was used to transfect rat dorsal root ganglion (DRG) and hippocampal neurons in primary culture with the genes for the enhanced blue and green fluorescent proteins (EBFP and EGFP) under control of the cytomegalovirus promoter. Quantitative analysis of marker protein fluorescence detected expression at 3 h that continued to increase for 48 h. For DRG neurons the optimal expression efficiency of 8±2% was obtained 24 h following transfection. In contrast, approximately 2±1% of hippocampal neurons in culture expressed EGFP at 3 h which subsequently declined. Co-transfection of DRG cultures with two plasmids produced reliable expression of both genes. Transfected DRG neurons exhibited normal electrophysiological properties, and resting and stimulated intracellular Ca2+ concentrations were unchanged. After transfection, 44% of hippocampal neurons remained in functional synaptic networks as indicated by glutamatergic Ca2+ spiking activity. Particle-mediated gene delivery provided a straightforward, reproducible and efficient method for transfection of neurons in primary culture. Transfected cells were easily identified by EGFP fluorescence, enabling subsequent physiological analysis. Biolistic particle bombardment was well tolerated by peripheral neurons, although caution was required when this method was applied to CNS cultures.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s004249900240
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  • 17
    Digitale Medien
    Digitale Medien
    A first estimate of organic carbon storage in Holocene lake sediments in Alberta, Canada (2000)
    Springer
    Journal of paleolimnology 24 (2000), S. 395-400 
    Details
    ISSN: 1573-0417
    Schlagwort(e): carbon storage ; lake sediment ; Holocene ; Canada ; climate change ; organic matter
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Geologie und Paläontologie
    Notizen: Abstract This paper reports a first estimate of the Holocene lake sediment carbon pool in Alberta, Canada. The organic matter content of lake sediment does not appear to depend strongly on lake size or other limnological parameters, allowing a simple first estimate in which we assume all Alberta lake sediment to have the same organic matter content. Alberta lake sediments sequester about 15 g C m-2 yr-1, for a provincial total of 0.23 Tg C yr-1, or 2.3 Pg C over the Holocene. Alberta lakes may represent as much as 1/1700 of total global, annual permanent carbon sequestration.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1008103605817
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  • 18
    Digitale Medien
    Digitale Medien
    Microbial Biomass and Community Structure in a Sequence of Soils with Increasing Fertility and Changing Land Use (2000)
    Springer
    Microbial ecology 40 (2000), S. 223-237 
    Details
    ISSN: 1432-184X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The microbial biomass and community structure of eight Chinese red soils with different fertility and land use history was investigated. Two community based microbiological measurements, namely, community level physiological profiling (CLPP) using Biolog sole C source utilization tests and phospholipid fatty acid (PLFA) profiles, were used to investigate the microbial ecology of these soils and to determine how land use alters microbial community structure. Microbial biomass-C and total PLFAs were closely correlated to organic carbon and total nitrogen, indicating that these soil microbial measures are potentially good indices of soil fertility in these highly weathered soils. Metabolic quotients and C source utilization were not correlated with organic carbon or microbial biomass. Multivariate analysis of sole carbon source utilization patterns and PLFAs demonstrated that land use history and plant cover type had a significant impact on microbial community structure. PLFAs showed these differences more than CLPP methods. Consequently, PLFA analysis was a better method for assessing broad-spectrum community differences and at the same time attempting to correlate changes with soil fertility. Soils from tea orchards were particularly distinctive in their CLPP. A modified CLPP method, using absorbance readings at 405 nm and different culture media at pH values of 4.7 and 7.0, showed that the discrimination obtained can be influenced by the culture conditions. This method was used to show that the distinctive microbial community structure in tea orchard soils was not, however, due to differences in pH alone.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002480000053
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  • 19
    Digitale Medien
    Digitale Medien
    Alaboratory evaluation ofAnthocoris nemorum andA. nemoralis [Hem.: Anthocoridae] as predators ofPhorodon humuli [Hom.: Aphididae] (1977)
    Springer
    BioControl 22 (1977), S. 309-314 
    Details
    ISSN: 1573-8248
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Beschreibung / Inhaltsverzeichnis: Résumé Anthocoris nemorum (L.) etA. nemoralis (F.) ont été élevés sur le stade aptère du puceron du houblon,Phorodon humuli (Schrank), à 20°C±0.5°C. A. nemorum etA. nemoralis ont consommé durant leur phase larvaire, en moyenne 255 et 174 pucerons respectivement, les adultes par contre ont consommé respectivement 37 et 33 pucerons par jour. Les jeunes larves consommaient de façon sélective les jeunes pucerons, tandis que les adultes et les larves au 5c stade consommaient des pucerons de toute taille. Le délai de développement entre l'émergence et la métamorphose finale pourA. nemorum etA. nemoralis fut de 22 et 16 jours respectivement.
    Notizen: Abstract Anthocoris nemorum (L.) andA. nemoralis (F.) were reared on apterous hop aphids,Phorodon humuli (Schrank), at 20±0.5°C.A. nemorum andA. nemoralis killed an average of 255 and 174 aphids respectively during nymphal development, and the adults killed 37 and 33 per day respectively. Small anthocorid nymphs selectively killed small aphids but adult anthocorids and 5th instar nymphs killed aphids of every size. Mean development times from emergence to final moult were 22 and 16 days forA. nemorum andA. nemoralis respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02372153
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  • 20
    Digitale Medien
    Digitale Medien
    Psychiatry and the medical student (1930)
    Springer
    Psychiatric quarterly 4 (1930), S. 118-126 
    Details
    ISSN: 1573-6709
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01563202
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