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  • 1
    Electronic Resource
    Electronic Resource
    Behavioral Model of Anorexia Nervosa Characteristics of Young Female Rats with Restricted Feeding in Activity-Wheel Cages (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 575 (1989), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1989.tb53295.x
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  • 2
    Electronic Resource
    Electronic Resource
    Humoral Regulation of Stem Cell Proliferation (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 554 (1989), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1989.tb22420.x
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  • 3
    Electronic Resource
    Electronic Resource
    Germination Responses of Taraxacum platycarpum Seeds to Temperature (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Plant species biology 4 (1989), S. 0 
    Details
    ISSN: 1442-1984
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Germination responses of Taraxacum platycarpum seeds to temperature were examined under laboratory conditions to investigate the emergence-season choice mechanism of the seeds. Almost all the newly collected seeds were non-dormant. Under constant temperature conditions, maximum percentage germination (approximately 90%) was attained at temperatures 6–16°C, where simple linear relationships were observed between the temperature and the rates of germination, i.e. the reciprocals of the time taken to germinate by seed subpopulations with 10–80% germination. Thermal time required for germination of the subpopulations ranged from 600 Kh (degree Kelvin × hours) to 1500 Kh with a relatively constant base temperature of about 2.5°C. Lower limit temperature for germination was slightly below 6°C. Higher limit temperature for germination has the normal distribution with the mean ±SD of 19±2.5°C. Pre-exposure of imbibed seeds to temperatures higher than the higher limit temperature for germination, 25 and 30°C, had no effect on the germinability and the rate of germination at a circa-optimum temperature. Moist chilling treatment at 4°C caused an increase in the variation of germination rate within the seed population, but no evidence for dormancy-inducing or breaking effects was obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1442-1984.1989.tb00054.x
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  • 4
    Electronic Resource
    Electronic Resource
    An NADH: Fe(III) EDTA oxidoreductase from Cryptococcus albidus: an enzyme involved in ethylene production in vivo? (1989)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 60 (1989), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract An ethylene-forming enzyme which forms ethylene from 2-oxo-4-methylthiobutyric acid (KMBA) was purified to an electrophoretically homogeneous state from a cell-free extract of Cryptococcus albidus IFP 0939. The presence of KMBA, NADH, Fe(III) chelated to EDTA and oxygen were essential for the formation of ethylene. When ferric ions, as Fe(III)EDTA, in the reaction mixture were replaced by Fe(II)EDTA under aerobic conditions, the non-enzymatic formation of ethylene was observed. Under anaerobic conditions in the presence of Fe(III)EDTA and NADH, the enzyme reduced 2 mol of Fe(III) with 1 mol of NADH to give 2 mol of Fe(II) and 1 mol NAD+, indicating that the ethylene-forming enzyme is an NADH-Fe(III)EDTA oxidoreductase. The role of NADH:Fe(III)EDTA oxidoreductase activity in the formation in vivo ethylene from KMBA is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1989.tb03428.x
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  • 5
    Electronic Resource
    Electronic Resource
    A membrane-bound isobutene-forming enzyme from Rhodotorula minuta (1989)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 58 (1989), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract An Arrhenius plot for the formation of isobutene by cell extracts of Rhodotorula minuta IFO 1102 gave a discontinuous line and isobutene-forming activity was found to be present in the microsomal fraction of the extracts. These results indicate that the isobutene-forming enzyme is membrane-bound.The formation of isobutene by the microsomes was inhibited by some redox reagents and completely eliminated by the presence of carbon monoxide. These findings suggested that a cytochrome P-450 participated in the reaction. In fact, a cytochrome P-450 and cytochrome P-450 reductase were detected in the microsomes obtained from cells that contained the isobutene-forming activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1989.tb03044.x
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  • 6
    Electronic Resource
    Electronic Resource
    Purification and some properties of a novel ethylene-forming enzyme produced by Penicillium digitatum (1989)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 59 (1989), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract A novel ethylene-forming enzyme that forms ethylene from α-ketoglutarate was purified from the cell-free extract of Penicillium digitatum IFO 9372. The purified enzyme was confirmed to be homogenous on polyacrylamide disc gel electrophoresis, and the molecular weight of the enzyme consisting of a single polypeptide was estimated to be about 42 kDa by gel filtration column chromatography and sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The presence of α-ketoglutarate, l-arginine, ferrous ion, dithiothreitol and oxygen were essential for the enzyme reaction. Substrate and cofactor specificity of the enzyme was highly specific for α-ketoglutarate and l-arginine, respectively. Some properties of the purified enzyme were surveyed and compared with those of the ethylene-forming system in higher-plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1989.tb03072.x
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  • 7
    Electronic Resource
    Electronic Resource
    Studies on diacetylenic vinyl compounds (1989)
    Springer
    Polymer bulletin 22 (1989), S. 533-538 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The copolymerization of maleic anhydride (MAn) with phenyl-4′-vinylphenylbutadiyne(PVPB) was carried out using 2, 2′-azobisisobutyronitrile as an initiator. Although PVPB does not homopolymerize by free radicals in solution, it copolymerized giving copolymers having average molecular weights up to 12,000, and consisting of slightly more PVPB units. The monomer reactivity ratios were estimated to be r (MAn)=0 and r (PVPB) =0.1–0.2. It was concluded that the copolymerization likely proceeds via a free monomer propagation mechanism rather than through a donor-acceptor complex mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00718930
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  • 8
    Electronic Resource
    Electronic Resource
    Crystal structure of copper(II)mellitate, [Cu3.5C6(COO)5(COOH)(OH)2(H2O)8.5]·4.5H2O (1989)
    Springer
    Journal of chemical crystallography 19 (1989), S. 203-213 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of copper(II)mellitate, Cu3.5C12H29O27, has been determined by X-ray analysis. The complex crystallizes in the orthorhombic space groupIba2, with unit-cell dimensionsa=19.274(3),b=21.054(7),c=12.956(4) Å. The structure was deduced by the direct method with the help of the Patterson method and refined by the block-diagonal least-squares technique to a finalR value of 0.037 for 2995 observed reflections. Among six carboxyl groups of mellitic acid, five groups lose protons and form coordinate bonds to four copper atoms, and the remaining group forms hydrogen bonds to the water of crystallization and coordinated water. The configuration around copper is distorted-pyramidal, with the Cu-O bond distances of 1.896(7) to 2.425(7) Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01160857
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  • 9
    Electronic Resource
    Electronic Resource
    Statistical properties of the laser emission in a low-Q cavity (1989)
    Springer
    Applied physics 48 (1989), S. 327-338 
    Details
    ISSN: 1432-0649
    Keywords: 42.50.−p ; 05.40.+j ; 02.50.+s
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigate theoretically the stationary statistical properties of the laser radiation in a low-Q cavity with field, polarization, and population fluctuations. Eliminating adiabatically the electric field from the Maxwell-Bloch equations, coupled Langevin equations with bothadditive andmultiplicative noises are derived and are transformed into the multivariable Fokker-Planck equation of a probability density of the light intensity and the population difference. It is solved by the expansion into orthonormal sets, and a vector recurrence equation of motion of the expansion coefficients is given whose stationary solutions are analytically obtained in theMatrix continued-fraction. The stationary distribution function of the radiation intensity are calculated with several values of control parameters. We discuss the variance of the intensity distribution, the photon-counting coefficient, and the cross-correlation between intensity and population as a function of the pump parameter, and reveal the novel and characteristic features of the bad-cavity laser system. The comparison with the good-cavity (high-Q cavity) case is also made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694190
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  • 10
    Electronic Resource
    Electronic Resource
    Two unstable oscillations in the multimode laser with modulated inversion (1989)
    Springer
    Applied physics 49 (1989), S. 397-407 
    Details
    ISSN: 1432-0649
    Keywords: 42.50.Tj ; 42.55.−f ; 05.45.+b
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present comprehensive results of numerical studies on the dynamical properties of a multimode ring laser under modulation of the population inversion in the bad-cavity condition. Incoherent properties of unstable oscillations in this system are investigated in detail as a function of two control parameters: the dc component of the population inversion and the modulation amplitude. Two kinds of optical chaos in two limiting regions reported in a previous paper are extensively studied to clarify their different characteristics from deterministic and stochastic points of view. The competition between their different origins is revealed. Statistical properties of their stochasticity are investigated to clarify their non-Gaussian natures. Comparison with analytical results for a single-mode laser with fluctuations is also made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325340
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