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  • Articles  (39)
  • Articles: DFG German National Licenses  (39)
  • Springer  (38)
  • Blackwell Science Ltd  (1)
  • 2000-2004  (8)
  • 1985-1989  (23)
  • 1905-1909  (8)
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  • Articles  (39)
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  • 1
    Electronic Resource
    Electronic Resource
    Grass cells ingested by ruminants undergo autolysis which differs from senescence: implications for grass breeding targets and livestock production (2002)
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 25 (2002), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: It is widely believed that the initial degradation of proteins contained in grazed forage is mediated by rumen micro-organisms, but the authors’ recent work suggests that the plant cells themselves contribute to their own demise. In the present study the responses of Lolium perenne leaves to the rumen environment were investigated by using an in vitro system which simulates the main stresses of the rumen but from which rumen micro-organisms were excluded. Degradation of leaf protein and the accumulation of amino acids in tissue and bathing medium occurred over a time-scale that is relevant to rumen function, and in a near 1 : 1 ratio. Significant loss of nuclear material was observed after 6 h incubation and chloroplasts became morphologically more spherical as the incubation progressed. In situ localization suggested that ribulose 1,5 bisphosphate carboxylase/oxygenase was broken down within chloroplasts which from cytology were judged to be intact. We conclude from these data that plant metabolism may play a significant role in breaking down plant proteins within relatively intact organelles in the rumen. The determinations of chlorophyll content and cell viability revealed that the plant processes occurring in the simulated rumen were similar but not identical to those of natural senescence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3040.2002.00908.x
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  • 2
    Electronic Resource
    Electronic Resource
    Action spectrum for the effect of day-extensions on flowering and apex elongation in green, light-grown wheat (Triticum aestivum L.) (1989)
    Springer
    Planta 179 (1989), S. 428-432 
    Details
    ISSN: 1432-2048
    Keywords: Action spectrum ; Light-grown plants ; Photoperiodism ; Phytochrome (type I) ; Triticum (photoperiodism)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Fluence-rate response curves for wavelengths from 640 nm to 730 nm were constructed for the day-extension promotion of flowering in green, light-grown, wheat (Triticum aestivum L., cv. Alexandria), a long-day plant. The resultant action spectrum had action maxima at 660 nm and 716 nm and resembles spectra for the high-irradiance reaction (HIR) seen in etiolated plants. Because, the HIR is thought to be controlled by type I pytochrome (that which is most abundant in etiolated tissue) our results indicate the involvement of type I phytochrome in the photomorphogenesis of a light-grown, green plant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397581
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  • 3
    Electronic Resource
    Electronic Resource
    Seed dispersal and movement patterns in two species of Ceratogymna hornbills in a West African tropical lowland forest (2000)
    Springer
    Oecologia 125 (2000), S. 249-257 
    Details
    ISSN: 1432-1939
    Keywords: Seed dispersal Seed shadow Hornbills Telemetry Tropical frugivory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. We studied two species of Ceratogymna hornbills, the black-casqued hornbill, C. atrata, and the white-thighed hornbill, C. cylindricus, in the tropical forests of Cameroon, to understand their movement patterns and evaluate their effectiveness as seed dispersers. To estimate hornbill contribution to a particular tree species' seed shadow we combined data from movements, determined by radio-tracking, with data from seed passage trials. For 13 individuals tracked over 12 months, home range varied between 925 and 4,472 ha, a much larger area than reported for other African avian frugivores. Seed passage times ranged from 51 to 765 min, with C. atrata showing longer passage times than C. cylindricus, and larger seeds having longer gut retention times than smaller seeds. Combining these data, we estimated that seed shadows were extensive for the eight tree species examined, with approximately 80% of seeds moved more than 500 m from the parent plant. Maximum estimated dispersal distances for larger seeds were 6,919 and 3,558 m for C. atrata and C. cylindricus, respectively. The extent of hornbill seed shadows suggests that their influence in determining forest structure will likely increase as other larger mammalian dispersers are exterminated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004420000445
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  • 4
    Electronic Resource
    Electronic Resource
    The Physical Tourist¶Scientific Travels in the Irish Countryside (2000)
    Springer
    Physics in perspective 2 (2000), S. 313-326 
    Details
    ISSN: 1422-6960
    Keywords: Key words. History of science; Ireland; Rosse Telescope; St. Patrick's College; Birr Demense; Irish National Museum (Galway); Giant's Causeway.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Newly-prosperous Ireland has a number of sites which the scientific traveller can visit. There are apparatus museums at Birr and Maynooth, and a collection of early apparatus at the physics department of the Irish National University in Galway. The main attraction at Birr is the Rosse Telescope, with its 6-ft diameter speculum, built in the 1840s, and recently refurbished. Travellers to Northern Ireland can see applied geology at the Giant's Causeway.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000160050048
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  • 5
    Electronic Resource
    Electronic Resource
    New ways of determining structural groups in brown coals and their bioconversion products by FT IR spectroscopy (2000)
    Springer
    Applied microbiology and biotechnology 54 (2000), S. 681-685 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract New methods of determining the structural groups —COOH and —CH2— have been developed. The investigation of carboxyl groups is possible both after derivatization with p-fluorophenacylbromide and by quantitative interpretation of the Fourier transform infrared (FT IR) spectra. There exists a linear relationship between the results of these two methods that is generally valid for the analysis of all brown coal components. The maximum extinction coefficient of the symmetric stretching vibration band of the CH2 groups has been determined using model substances. This allows quantification of this structural group directly from the FT IR spectrum. The results agree with the contents of methylene groups as determined by 13C-cross polarization–magic angle spinning–nuclear magnetic resonance (13C CPMAS NMR) spectroscopy. Using these methods, the COOH and CH2 groups contained in brown coals of the North Rhine region and in their bioconversion products have been quantified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530000419
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  • 6
    Electronic Resource
    Electronic Resource
    Vergleich verschiedener planarer Passivierungstechniken für Halbleiterleistungsbauelemente (1989)
    Springer
    Electrical engineering 72 (1989), S. 89-94 
    Details
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents Different passivation techniques for planar semiconductor power devices with blocking voltages of 1600 V are studied using two-dimensional numerical simulations.
    Notes: Übersicht Für die Entwicklung einer optimalen Planar-passivierung von Halbleiterleistungsbauelementen mit Sperrspannungen von 1600 V wird ein Vergleich verschiedener Strukturen anhand zweidimensionaler numerischer Simulationen durchgeführt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01573642
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  • 7
    Electronic Resource
    Electronic Resource
    Angle-resolved thermal desorption of atoms from solid surfaces: one-phonon mechanism (1987)
    Springer
    Theoretical chemistry accounts 72 (1987), S. 475-484 
    Details
    ISSN: 1432-2234
    Keywords: Desorption ; Phonons ; Thermal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A model for one-phonon thermal desorption is presented in which the structure of the substrate phonons, expressed as a projection on a surface atom of the phonon density of states, appears as a separate factor in the angle- and energy-resolved desorption rate. Desorption from both localized, and delocalized initioladatom states is considered. Under certain circumstances one can obtain the cosine-distribution of the equilibrium theory, but in general, the desorption flux from delocalized states deviates from the cosine law by being peaked away from the surface normal, whereas for localized initiol states, the flux is concentrated more in the normal direction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01192236
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  • 8
    Electronic Resource
    Electronic Resource
    A Soft Computing Approach to Road Classification (2000)
    Springer
    Journal of intelligent and robotic systems 29 (2000), S. 349-387 
    Details
    ISSN: 1573-0409
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Current learning approaches to computer vision have mainly focussed on low-level image processing and object recognition, while tending to ignore high-level processing such as understanding. Here we propose an approach to object recognition that facilitates the transition from recognition to understanding. The proposed approach embraces the synergistic spirit of soft computing, exploiting the global search powers of genetic programming to determine fuzzy probabilistic models. It begins by segmenting the images into regions using standard image processing approaches, which are subsequently classified using a discovered fuzzy Cartesian granule feature classifier. Understanding is made possible through the transparent and succinct nature of the discovered models. The recognition of roads in images is taken as an illustrative problem in the vision domain. The discovered fuzzy models while providing high levels of accuracy (97%), also provide understanding of the problem domain through the transparency of the learnt models. The learning step in the proposed approach is compared with other techniques such as decision trees, naïve Bayes and neural networks using a variety of performance criteria such as accuracy, understandability and efficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008158907779
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  • 9
    Electronic Resource
    Electronic Resource
    Mapping of human autosomal phosphoglycerate kinase sequence to chromosome 19 (1986)
    Springer
    Somatic cell and molecular genetics 12 (1986), S. 395-401 
    Details
    ISSN: 1572-9931
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract In order to map human PGKsequences, DNA was prepared from 55 human-mouse somatic cell lines. The DNA was digested to completion with HindIII and Southern filters prepared. These filters were hybridized at high stringency conditions to a human PGKcDNA. Mouse and human X-linked and autosomal bands were distinguished and, in addition to known X-linked sequences, two autosomal PGKsequences were mapped: a 1-kb band to chromosome 19 and a 5-kb band to chromosome 6. The PGKcDNA probe was also hybridized to flow-sorted chromosomes confirming the presence of PGK sequences on the X chromosome and chromosomes 6 and 19.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01570734
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  • 10
    Electronic Resource
    Electronic Resource
    Humanα 2-macroglobulin gene is located on chromosome 12 (1985)
    Springer
    Somatic cell and molecular genetics 11 (1985), S. 285-289 
    Details
    ISSN: 1572-9931
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A cDNA clone encoding amino acids 809–1451 of the protease inhibitor α2-macroglobulin has been isolated from an adult human liver cDNA library. This cDNA was used to examine DNA samples prepared from a panel of human-mouse somatic cell hybrids with different numbers and combinations of human chromosomes for the presence of the human α2-macroglobulin gene. The cosegregation of this gene and chromosome 12 in the cell hybrid panel indicated that the α2-macroglobulin structural gene (designated A2M) is on human chromosome 12.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01534685
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