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  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 132-136 (Apr. 1997), p. 1617-1620 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 116 (1978), S. 151-159 
    ISSN: 1432-072X
    Keywords: Bdellovibrio bacteriovorus ; Starvation effects ; Viability loss ; Nucleotide metabolism ; Ribose degradation ; Substrate respiration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of various exogenous nucleic acid compounds on the viability and cell composition of Bdellovibrio bacteriovorus starved in buffer were measured. In decreasing order of effectiveness, these compounds were found to decrease the rate of loss of viability and the loss of cell carbon, cell ribonculeic acid, and cell protein: glutamate 〉 ribonucleoside monophosphates 〉 ribonucleosides 〉 deoxyribonucleoside monophosphates. Similar sparing effects were not observed with nucleic acid bases, deoxyribonucleosides, ribose, ribose-5-phosphate, deoxyribose, and deoxyribose-5-phosphate. Appreciable increases in the respiration rate over the endogenous rate did not occur when cell suspensions were incubated with individual or mixtures of nucleic acid compounds. Formation of 14CO2 by cell suspensions incubated with carbon 14-labeled nucleic acid compounds indicated ribonucleosides and ribonucleoside monophosphates were respired and to a small extent, were incorporated into cell material of non-growing cells. The respired 14CO2 was derived mainly from the ribose portion of these molecules. No respired 14CO2 or incorporated carbon 14 was found with bdellovibrios incubated with other nucleic acid compounds tested, including free ribose. During growth of B. bacteriovorus on Escherichia coli in the presence of exogenous UL-14C-ribonucleoside monophosphates, 10–16% of the radioactivity was in the respired CO2 and of the radioactivity incorporated into the bdellovibrios, only 40 to 50% resided in the cell nucleic acids. However, during growth on 14C-adenine,-uracil, or-thymidine labeled E. coli, only trace amounts of 14CO2 were found and 90% or more of the incorporated radioactivity was in the bdellovibrio nucleic acids. It is concluded that bdellovibrio can use ribonucleoside monophosphates during growth and starvation as biosynthetic precursors for synthesis of both nucleic acids and other cell materials as well as catabolizing the ribose portion for energy purposes.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 64 (1982), S. 237-241 
    ISSN: 0942-0940
    Keywords: Brain tumour ; cerebral cryptococcosis ; chronic meningitis ; computer tomography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A case of cerebral infection with cryptococcus neoformans whose symptoms simulated those of an intracranial space-occupying lesion is described. Differential diagnosis is a problem because of the aspecificity of the clinical and neuroradiological features of this grave fungal infection.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 3278-3289 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present a density functional theoretical study of neutral and negatively charged complexes of acrylonitrile (AN) with several clusters representing the Cu(100) surface. An external electric field is used to induce electron transfer onto the adsorbed molecule, in order to model the initial stage of electrochemical polymerization of AN on a copper electrode. We compare different possibilities of AN interaction with the metal and determine the most favorable configurations of the adsorbates in the absence and in the presence of the electric field. We discuss the influence of the electrochemical polarization on the type of AN adsorption, in relation with the experimental data on the adsorption of AN and electrochemical grafting of polyacrylonitrile. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-2242
    Keywords: Key words Similarity Coefficients ; Pedigree ; Kinship ; Rhododendron simsii ; Mantel’s test
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Fluorescent AFLP and automated data analysis were employed to assess the genetic conformity within a breeders’ collection of evergreen azaleas. The study included 75 genotypes of Belgian pot azaleas (Rhododendron simsii Planch. hybrids), Kurume and Hirado azaleas and wild ancestor species from the Tsutsusi subgenus. Fluorescent detection and addition of an internal size standard to each lane enabled the automated scoring of each fragment arising from a single AFLP primer combination (PC). The use of three PCs generated an initial data set with a total of 648 fragments ranging from 70 bp to 450 bp. Different marker selection thresholds for average fluorescent signal intensity and marker frequency were used to create eight extra restricted data subsets. Pairwise plant genetic similarity was calculated for the nine data sets using the Simple Matching coefficient (symmetrical, including double-zeros) and Jaccard coefficient (asymmetrical, excluding double zeros). The averages, the ranges and the correlation to one other (Mantel analysis) were compared for the obtained similarity matrices. This revealed the sensitivity of ordinations obtained by both similarity coefficients for the presence of weak or intensive markers or for the degree of polymorphism of the markers. For 34 cultivars, pedigree information (at maximum to the fifth ancestor generation) was available. Genetic similarity by descent (kinship coefficient) was turned into a genetic distance and correlated to the genetic conformity, as revealed by the different selections of AFLP markers (Mantel analysis). Use of a Simple Matching coefficient with no or moderate selection to signal intensity and excluding rare and abundant markers gave the best correlation with pedigree. Finally, the ordination of the studied genotypes by means of dendrograms and principal co-ordinate analysis was confronted with known or accepted relationships based on geographical origin, parentage and morphological characters. Genotypes could be assigned to three distinct groups: pot azaleas, Kurume azaleas and Hirado azaleas. Wild ancestor species appeared to be more related to the Japanese azaleas. Intermediate cultivars could be typified as crossings with Kurume or Hirado azaleas or with wild species.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Antonie van Leeuwenhoek 45 (1979), S. 517-519 
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Plant cell, tissue and organ culture 45 (1996), S. 231-236 
    ISSN: 1573-5044
    Keywords: azalea ; callus culture ; growth regulators ; Rhododendron simsii
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Rhododendron simsii ‘Hellmut Vogel’ was regenerated using different types of explants, auxins and cytokinins. After a callus induction phase, with 2,4-dichlorophenoxyacetic acid or α-naphthaleneacetic acid, adventitious shoot regeneration was obtained on a medium supplemented with thidiazuron or zeatin. With thidiazuron shoots were small and a subsequent elongation step was required before rooting. An elongation step was not required when zeatin was used. The duration of the callus induction phase was negatively correlated with the regeneration capacity.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract YBa2Cu3O7−x tapes were made by a powder-in-binder technique, using polysulphone (PSF) as the organic polymer andN-methyl-2-pyrrolidone (NMP) as the solvent. The suspension is cast onto a glass substrate plate to form the tape (Doctor Blade method) and is consequently immersed into a non-solvent to remove the solvent by phase inversion. In this paper we describe the different steps in an improved “peritectic” thermal treatment that are necessary to make the green product into a superconductive tape. Three steps are important in this heat treatment. First the polysulphone binder has to be removed as much as possible without reacting with the YBa2Cu3O7−x material. Next the sample has to be sintered into a dense ceramic material. In order to improve the intergranular connections, the sample is partially melted at relative low temperature in vacuum. The sample is subsequently heated up in oxygen to the normal sinter temperature. At this high temperature the YBa2Cu3O7−x phase will be restored by a peritectic reaction of the Y2BaCuO5 with a liquid phase. The final step is a two step anneal to ensure the full oxidation of the superconductor.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 36 (1998), S. 543-553 
    ISSN: 0887-6266
    Keywords: polyacrylonitrile ; polyimine ; isotacticity ; dynamic mechanical analysis ; Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polyacrylonitrile (PAN) films have been “grafted” onto copper electrodes by cathodic polarization and analyzed by infrared spectroscopy and dynamic mechanical thermal analysis (DMTA). The dynamic mechanical response shows two or three transitions depending on the film thickness and the potential deposition. The viscoelastic properties of “ungrafted” PAN films, e.g., solvent cast films of commercially available PAN, are deeply different from those of “electrografted” films. The experimental data support that “ungrafted” chains are paracrystalline in contrast to the “grafted” ones which are essentially amorphous. Moreover, the irreversible transformation of the “grafted” PAN chains observed beyond 225°C is confirmed by Fourier transform infrared (FTIR) analysis and ascribed to an intramolecular cyclization of PAN into polyimine. This reaction occurs rapidly and at a comparatively low temperature with respect to “ungrafted” PAN, which suggests that the “grafted” chain configuration might be predominantly isotactic. The isotacticity and the amorphous structure appear to decrease as the thickness of the PAN film is increased. Literature data and the herein reported observations would suggest a dependence of the amorphous structure of PAN on the chain isotacticity. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 543-553, 1998
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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