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  • Springer  (573)
  • Elsevier  (114)
  • Geological Society of America  (10)
  • Oxford University Press  (7)
  • American Society of Hematology  (4)
  • 2015-2019  (593)
  • 2000-2004  (54)
  • 1990-1994  (61)
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Keywords
Publisher
Years
Year
  • 11
    Electronic Resource
    Electronic Resource
    The relationships between relative growth rate, meristematic potential and compensatory growth of semiarid-land shrubs (1992)
    Springer
    Oecologia 90 (1992), S. 391-398 
    Details
    ISSN: 1432-1939
    Keywords: Browsing tolerance ; Clipping ; Compensatory growth capacity ; Herbivory tolerance ; Meristematic potential
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Inherent relative growth rate has been suggested as a major determinant of plant species' capacity to regrow and compensate for tissues lost to herbivores. We investigated: 1) the relationship between compensatory growth capacity and relative growth rate (RGR) in six semiarid-land shrubs following removal in winter or spring of 90% of the previous year's growth, 2) the influence of loss of buds on production of new growth and 3) the relationship between meristematic potential and the capacity to produce new growth in four of the six semiarid-land shrub species. Four-year-old plants growing under field conditions were used in the study. The species with the highest inherent growth rate, sagebrush [Artemisia tridentata ssp. vaseyana (Rydb.) Beetle], died following the severe clipping treatments. The other five species exactly compensated for lost tissues. Inherent growth rates and compensatory growth capacity of the shrubs were not correlated. Loss of 90% of the buds on the previous year's growth did not limit production of new growth. Instead, shrubs that lost buds produced more new growth biomass than the controls. The shrub species had significantly different meristematic potential. Curlleaf mountain mahogany (Cercocarpus ledifolius Nutt.) and serviceberry (Amelanchier alnifolia Nutt.) had the greatest and least number of buds and long shoots per plant, respectively. The number of long shoots produced following bud removal was positively correlated with new growth biomass, while the percentage of long shoots produced at the basal position on twigs was negatively correlated with new growth biomass. Our results suggest that inherent growth rate is not likely to influence production of new growth following browsing when resources for growth are not limiting. In contrast, the ability of a shrub to initiate long shoot growth is likely to influence production of new growth even when resources for growth are abundant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317696
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  • 12
    Electronic Resource
    Electronic Resource
    Metabolism and pharmacokinetics of prostaglandin E1 administered by intravenous infusion in human subjects (1994)
    Springer
    European journal of clinical pharmacology 46 (1994), S. 275-277 
    Details
    ISSN: 1432-1041
    Keywords: Prostaglandin E1 ; Infusion ; pharmacokinetics ; metabolism ; volunteers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract In a single-blind, randomized, two-way crossover study with 12 healthy male volunteers, 60 μg of prostaglandin E1 (PGE1) or placebo was administered by intravenous infusion during a 120-min period. PGE1, 13,14-dihydro-PGE1 (PGE0) and 15-keto-PGE0 plasma concentrations were measured by a highly specific and sensitive GC-MS/MS method. Endogenous PGE1 plasma concentrations ranged between 1.2 and 1.8 pg·ml−1. Endogenous PGE0 and 15-keto-PGE0 plasma concentrations varied from 0.8 to 1.3 pg·ml−1 and from 4.2 to 6.0 pg/ml respectively. During intravenous infusion of PGE1, plasma PGE1 concentrations rose to a level twice as high as during the placebo infusion. In contrast, PGE0 plasma concentrations were 8 times higher during PGE1 infusion than during placebo infusion, and 15-keto-PGE0 plasma concentrations were 20 times higher. The new analytical method has thus been useful to describe the pharmacokinetics of PGE1 and its metabolites PGE0 and 15-keto-PGE0, during and after intravenous infusion of PGE1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192562
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  • 13
    Electronic Resource
    Electronic Resource
    Effects of the Sol-Gel Processing on the Fluorescence Properties of Laser Dyes in Tetraethoxysilane Derived Matrices (2000)
    Springer
    Journal of sol gel science and technology 19 (2000), S. 799-802 
    Details
    ISSN: 1573-4846
    Keywords: sol-gel ; precursor chemistry ; fluorescence properties ; optical solids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Two fluorescent dyes were incorporated into sol-gel derived SiO2 matrices. The dye was added to SiO2 precursors of different degrees of pre-condensation and the spectroscopic properties of the immobilized dye were measured at various aging and drying stages of the resulting gels. The significant influence of the processing parameters on the spectroscopic properties is manifested in the relative intensity of a second red shifted emission band (550–560 nm), which was observed besides the typical coumarin emission band (495 nm). The appearance of this long wavelength emission might be attributed to dye aggregation or to other reactions with the ambient matrix forced by micro porosity phenomena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008768318418
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  • 14
    Electronic Resource
    Electronic Resource
    New fluorescent labels for time-resolved detection of biomolecules (1993)
    Springer
    Journal of fluorescence 3 (1993), S. 131-139 
    Details
    ISSN: 1573-4994
    Keywords: Fluorescence ; multiplex dyes ; photochemistry ; time-resolved spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New dyes with characteristic fluorescence lifetimes have been developed for bioanalytical applications. Based upon the concept of “multiplex dyes,” we have designed rhodamine dyes with nearly identical absorption and emission spectral characteristics but different fluorescence lifetimes. Extending this principle to applications with laser diodes, new rhodamines with functional groups for covalent coupling of analytes have been developed. The new labels exhibit absortion and fluorescence beyond 600 nm and have a high quantum efficiency, even in aqueous buffer systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00862730
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  • 15
    Electronic Resource
    Electronic Resource
    The “Authoring on the Fly” system for automated recording and replay of (tele)presentations (2000)
    Springer
    Multimedia systems 8 (2000), S. 158-176 
    Details
    ISSN: 1432-1882
    Keywords: Key words: Multimedia authoring – Electronic note-taking – Real-time random access – Stream synchronization – Educational software
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract. We discuss the problem of capturing media streams which occur during a live lecture in class or during a telepresentation. Instead of presenting yet another method or system for capturing the classroom experience, we introduce some informal guidelines and show their importance for such a system. We derive from these guidelines a formal framework for sets of data streams and an application model to handle these sets so that a real-time replay becomes possible. The Authoring on the Fly system is a possible realization of a framework which follows these guidelines. It allows the capture and real-time replay of data streams captured during a (tele)presentation, including audio, video, and whiteboard action streams. This article gives an overview of the different AoF system components for the various phases of the teaching and learning cycle. It comprises an integrated text and graphics editor for the preparation of pages to be loaded by the whiteboard during the presentation phase. The recording component of the system captures various data streams of the live presentation. They are postprocessed by the system so that they become instances of the class of media for whose replay the general application model was developed. From a global point of view, the Authoring on the Fly system allows one to merge three apparently distinct tasks – teaching in class, telepresentation, and multimedia authoring – into one single activity. The system has been used routinely for recording telepresentations over the MBone net and has already led to a large number of multimedia documents which have been integrated automatically into Web-based teaching and learning environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005300000042
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  • 16
    Electronic Resource
    Electronic Resource
    Genome analysis of intergeneric hybrids of apomictic and sexual Australian Elymus species with wheat, barley and rye: implication for the transfer of apomixis to cereals (1993)
    Springer
    Theoretical and applied genetics 86 (1993), S. 288-294 
    Details
    ISSN: 1432-2242
    Keywords: Apomixis ; Wheat ; Barley ; Rye ; Wide hybridization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Four hybrids were obtained between three Australian Elymus taxa and three cereal grains: wheat, rye, and barley. Mean meiotic metaphase-I configurations were 41.14 I, 0.42 rod II, 0.003 ring II, and 0.01 III for E. scabrus var ‘plurinervis’ x Triticum aestivum (1 hybrid plant), 22.27 I, 2.63 rod II, 0.06 ring II, and 0.12 III for E. scabrus var ‘scabrus’ x Secale cereale (4 hybrid plants), and 26.65 I, 0.66 rod II, 0.00 ring II, and 0.01 III for E. scabrus var ‘plurinervis’ x Hordeum vulgare (13 hybrid plants). The I genome of barley also paired very little in a BIII hybrid of apomictic E. rectisetus x H. vulgare (2 hybrid plants). Megasporogenesis in this BIII hybrid was at least facultatively apomeiotic, with the same sort of nuclear elongation, apomeiotic division, and dyad formation seen previously in E. rectisetus itself. All four hybrid combinations were sterile. While spike morphology in the E. scabrus x T. aestivum and E. scabrus x H. vulgare hybrids were intermediate to their parents, E. scabrus x S. cereale and E. rectisetus x H. vulgare looked like their maternal parents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222090
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  • 17
    Electronic Resource
    Electronic Resource
    Magnetic Anisotropy of PrNi5 Single Crystal at Millikelvins (2000)
    Springer
    Journal of low temperature physics 120 (2000), S. 435-448 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Magnetic ordering in the hyperfine enhanced nuclear ferromagnet PrNi5 was investigated in external magnetic fields up to 72 mT at temperatures from below the ordering temperature up to about 20 mK. An anisotropy of the magnetization and ac susceptibility was observed for two single crystalline samples having a or c crystallographic axis parallel to the external field. The results show that the nuclear magnetic moments of Pr are ordered in the basal plane of the hexagonal crystal structure of PrNi5.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004644905467
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  • 18
    Electronic Resource
    Electronic Resource
    Calculation of Magnetic Properties and Specific Heat for the Nuclear Enhanced Ferromagnet PrNi5 (2000)
    Springer
    Journal of low temperature physics 120 (2000), S. 401-434 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A general model hamiltonian for hyperfine enhanced magnetic materials is presented. The use of the model is not limited only to the nuclear regime, but the model treats also situations when the strength of the exchange interaction is close to and above the threshold value. The model is solved numerically for PrNi5 and the results are compared with recent ultra-low temperature experiments. In particular, the behavior of magnetization, susceptibility, and specific heat of PrNi5 is studied for two external field geometries and anisotropic properties are pointed out. The effect of the quadrupole interaction is examined in detail. The question of the correlations among interacting ions is also addressed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004692821396
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  • 19
    Electronic Resource
    Electronic Resource
    Propidium-iodide-loaded polyalkylcyanoacrylate particles —labelling conditions and loading capacity (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 147-152 
    Details
    ISSN: 1435-1536
    Keywords: Cyanoacrylate nanoparticles ; propidium iodide ; nanoparticle ; fluorescent labelling ; fluorescent labelling of nanoparticles ; nanoparticle loading capacity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Polyalkylcyanoacrylate nanoparticles were labelled with the fluorescent marker propidium iodide to follow their cellular distribution. Fixation of propidium iodide onto the nanoparticles can be achieved by its addition to the polymerization medium after initiating the polymerization process. However, the charged propidium iodide was found to distort the anionic polymerization process. Therefore, polymerization conditions were optimized with regard to the time of marker addition and marker concentration, loading capacity, and monodispersity of the nanoparticles size distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00660304
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  • 20
    Electronic Resource
    Electronic Resource
    Acrylic acid copolymer nanoparticles for drug delivery. Part II: Characterization of nanoparticles surface-modified by adsorption of ethoxylated surfactants (1993)
    Springer
    Colloid & polymer science 271 (1993), S. 100-105 
    Details
    ISSN: 1435-1536
    Keywords: Nanoparticles ; acrylic acid copolymer ; ethoxylated surfactants ; hydrophobic interaction chromatography (HIC) ; poloxamer ; poloxamine ; antarox
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Copolymer nanoparticles of acrylic acid, acrylic amide, acrylic butylester, and methacrylic methylester with increasing content of acrylic acid were produced and surface-modified by adsorption of nonionic (Poloxamer 407, Poloxamine 908, Antarox CO 990) and ionic (Gafac RE 960) surfactants. The coated particles were characterized with regard to parameters relevant for the in vivo organ distribution: coating layer thickness, charge-reducing effect of the coating layer and surface hydrophobicity. Gafac was found to form highly charged surface layers leading to recognition by the reticuloendothelial system (RES). The hydrophobicity of the coating layers decreased with increasing thickness. The thickest coating layers were found on the most hydrophobic particles possessing least content of acrylic acid (1.9%). These particles coated with the nonionics were regarded as sufficiently hydrophilic to potentially reduce the uptake by the RES in vivo. The properties of coating layers can therefore be optimized by variation of the monomer ratios in copolymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652310
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