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  • 1
    Electronic Resource
    Electronic Resource
    Global bifurcations in a laser with injected signal: Beyond Adler's approximation (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 11 (2001), S. 500-513 
    Details
    ISSN: 1089-7682
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We discuss the dynamics in the laser with an injected signal from a perturbative point of view showing how different aspects of the dynamics get their definitive character at different orders in the perturbation scheme. At the lowest order Adler's equation [Proc. IRE 34, 351 (1946)] is recovered. More features emerge at first order including some bifurcations sets and the global reinjection conjectured in Physica D 109, 293 (1997). The type of codimension-2 bifurcations present can only be resolved at second order. We show that of the two averaging approximations proposed [Opt. Commun. 111, 173 (1994); Quantum Semiclassic. Opt. 9, 797 (1997); Quantum Semiclassic. Opt. 8, 805 (1996)] differing in the second order terms, only one is accurate to the order required, hence, solving the apparent contradiction among these results. We also show in numerical studies how a homoclinic orbit of the Sil'nikov type, bifurcates into a homoclinic tangency of a periodic orbit of vanishing amplitude. The local vector field at the transition point contains a Hopf-saddle-node singularity, which becomes degenerate and changes type. The overall global bifurcation is of codimension-3. The parameter governing this transition is θ, the cavity detuning (with respect to the atomic frequency) of the laser. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1397757
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  • 2
    Electronic Resource
    Electronic Resource
    Orthogonal field alternation gelelectrophoresis (OFAGE) as a means for the analysis of somatic hybrids obtained by protoplast fusion of different Saccharomyces strains (1987)
    Springer
    Current genetics 11 (1987), S. 599-603 
    Details
    ISSN: 1432-0983
    Keywords: OFAGE ; Protoplast fusion ; Genetic analysis ; Saccharomyces
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary PEG-induced fusion of two haploid Saccharomyces strains resulted in three morphologically different types of fusion products. In order to estimate the respective ploidy, one representative of each type — F 1, F 2 and F 3 — was subjected to a measurement of the cellular DNA content and to a meiotic segregation analysis. The data obtained in these analyses suggested the strain F 1 to be a haploid cybrid resulting from mere plasmogamy, whereas the hybrids F 2 and F 3 were likely to be the products of a successful nuclear fusion of two, respectively three, protoplasts of the parental strains. However, the complete genetic composition of the hybrids could only be revealed by OFAGE experiments, as the genetic data solely referred to a few chromosomes with marker genes. All the results of the OFAGE were in full accordance with the assumptions made in the conventional analysis, thus indicating the OFAGE to become a very promising means for the investigation of hybrids inaccessible to genetic analyses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393922
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  • 3
    Electronic Resource
    Electronic Resource
    Botanische Erforschung westantarktischer Inselgruppen (1966)
    Springer
    Naturwissenschaften 53 (1966), S. 150-152 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00591885
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  • 4
    Electronic Resource
    Electronic Resource
    Translocation velocity and specific mass transfer in the sieve tubes of Fraxinus americana L. (1969)
    Springer
    Planta 84 (1969), S. 272-278 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The ratios of sugar concentrations (sucrose/stachyose, raffinose/stachyose and sucrose/raffinose) in the sieve-tube exudate of Fraxinus americana L. undergo slight diurnal fluctuations. These “ratio waves” have been found to move down along the stem of trees at a velocity of 30–70 cm/h. They are, in contrast to the “concentration waves” of Huber et al. (1937), independent of the absolute exudate concentration and thus unaffected by hydrodynamic pressures changes in the xylem. The velocity is of the order of magnitude required by the mass transfer equation and thus indicates that sieve tube exudate is a moving solution. Furthermore, the phenomenon enabled us for the first time to follow phloem transport over distances of 12 meters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388113
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  • 5
    Electronic Resource
    Electronic Resource
    Book reviews (1973)
    Springer
    Wood science and technology 7 (1973), S. 321-322 
    Details
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351078
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  • 6
    Electronic Resource
    Electronic Resource
    Book reviews (1974)
    Springer
    Wood science and technology 8 (1974), S. 162-162 
    Details
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00351370
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  • 7
    Electronic Resource
    Electronic Resource
    Analysis of hybrids obtained by rare-mating of Saccharomyces strains (1991)
    Springer
    Applied microbiology and biotechnology 35 (1991), S. 242-246 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Rare-mating of closely related Saccharomyces cerevisiae and S. diastaticus strains led to the formation of different hybrids. Mating-type switching and chromosome losses could be observed by means of classical genetic analysis and pulsed field gel electrophoresis of intact chromosomes. The latter was facilitated by extensive chromosome length polymorphism in both strains. When crossing the two haploid strains S. cerevisiae 41 α and S. diastaticus ATCC 28339 α, two different types of hybrids occurred. Both types showed complete addition of both parental genomes, one aα-status and the other αα-status. The αα-status could be explained by assuming a transient premutational lesion in MAT α. Usually lesions are repaired after a mating event and the α-mating type is restored. When crossing a diploid S. diastaticus strain, isogenic to the one previously mentioned, with the haploid S. cerevisiae strain, three different types of hybrids could be distinguished regarding their mating-types. It was possible to prove that the haploid S. diastaticus strain ATCC 28339 is disomic and the diploid hybrid, named 41ATCC-b, is trisomic for chromosome I. This could be shown by means of electrophoretic karyotyping of the hybrid and of the four single-spore cultures from one ascus of the hybrid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00184695
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  • 8
    Electronic Resource
    Electronic Resource
    Nadh: Ubiquinone oxidoreductase in obligate aerobic yeasts (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 10 (1994), S. 475-479 
    Details
    ISSN: 0749-503X
    Keywords: NADH:ubiquinone oxidoreductase ; complex I ; strictly aerobic yeasts ; rotenone ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: The strictly aerobic yeasts Candida pinus, Cryptococcus albidus, Rhodotorula minuta, Rhodotorula mucilaginosa and Trichosporon beigelii possess mitochondrial NADH dehydrogenases with significant features of the NADH:ubiquinone oxidoreductase (complex I). These species show in all growth phases and under standard cultivation conditions, NADH dehydrogenases of approximately 700 kDa, which are sensitive to rotenone, a specific inhibitor of this complex. Identical results were obtained with the weakly fermenting C. pinus. The facultatively fermenting yeasts Saccharomyces cerevisiae and Kluyveromyces marxianus do not possess the 700 kDa-complex and are insensitive to rotenone. In S. cerevisiae, a rotenone-insensitive NADH dehydrogenase of about 500-600 kDa is detected only in stationary phase cells.As in Neurospora crassa, upon incubation of the obligately aerobic yeast R. mucilaginosa with chloramphenicol, an intermediate NADH dehydrogenase of approximately 350 kDa was formed, which was insensitive to rotenone.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/yea.320100406
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  • 9
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    Stochastic Spatiotemporal Intermittency and Noise-Induced Transition to an Absorbing Phase (2000)
    American Physical Society
    Details
    Publication Date: 2000-10-23
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society
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  • 10
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    How tissue fluidity influences brain tumor progression (2019)
    National Academy of Sciences
    Details
    Publication Date: 2019-12-16
    Description: Mechanical properties of biological tissues and, above all, their solid or fluid behavior influence the spread of malignant tumors. While it is known that solid tumors tend to have higher mechanical rigidity, allowing them to aggressively invade and spread in solid surrounding healthy tissue, it is unknown how softer tumors can grow within a more rigid environment such as the brain. Here, we use in vivo magnetic resonance elastography (MRE) to elucidate the role of anomalous fluidity for the invasive growth of soft brain tumors, showing that aggressive glioblastomas (GBMs) have higher water content while behaving like solids. Conversely, our data show that benign meningiomas (MENs), which contain less water than brain tissue, are characterized by fluid-like behavior. The fact that the 2 tumor entities do not differ in their soft properties suggests that fluidity plays an important role for a tumor’s aggressiveness and infiltrative potential. Using tissue-mimicking phantoms, we show that the anomalous fluidity of neurotumors physically enables GBMs to penetrate surrounding tissue, a phenomenon similar to Saffman−Taylor viscous-fingering instabilities, which occur at moving interfaces between fluids of different viscosity. Thus, targeting tissue fluidity of malignant tumors might open horizons for the diagnosis and treatment of cancer.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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