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  • 1
    Electronic Resource
    Electronic Resource
    Ultra-violet induced mutants of blue-green algae (1964)
    Springer
    Archives of microbiology 48 (1964), S. 118-121 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two U.V. induced mutants of nitrogen-fixing Anabaena doliolum have been isolated: 1. 5M 16 — This strain characterised as glucose-requiring nitrogen-fixing mutant, does not grow photo-autotrophically in the basal medium but does so when supplemented with glucose. Its growth rate is rather slow on AA-1, AA-3 and AA-4 but it grows very fast on AA-2. 2. L Y-5M8/5M12 — This strain characterised on the basis of periodic occurrence of massive lytic property, characteristic of each supplemented medium, grows initially for some time and then the whole population undergoes lysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408452
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  • 2
    Electronic Resource
    Electronic Resource
    Ultra-violet induced mutants of blue-green algae (1964)
    Springer
    Archives of microbiology 48 (1964), S. 109-117 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Mutant strains of Anabaena cycadeae Reinke have been isolated after ultra-violet irradiation. All the four mutants described appear to be stable. They have been identified on the basis of their pigment composition, nutritional requirements, photoautotrophic growth and reaction to light. Strain 10 M 1 L is a non-nitrogen-fixing mutant as indicated by its inability to grow on basal medium (AA) deficient in combined nitrogen. Strain 10 M 1 L /10 M 1 D is apochlorotic, and grows very slowly on medium AA-3 both in light and dark but comparatively better under the latter condition. Strain 10 M 1 L /10 M 2 D is deficient in β-carotenoid, photosensitive and able to grow in dark only on AA-3 medium while strain 10 M 1 L /10 M 3 D is a photoheterotrophic nitrogen-fixer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408451
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  • 3
    Electronic Resource
    Electronic Resource
    Transverse-phonon helicon interaction in metallic plasmas (1985)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 5 (1985), S. 279-291 
    Details
    ISSN: 0392-6737
    Keywords: General theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si studia l'interazione dei fononi trasversi (onde acustiche) con gli eliconi (onde di eliconi) nel limite di grandi lunghezze d'onda e si discutono le condizioni per l'amplificazione di risonanza (in plasma con attrito) e di smorzamento (in plasma con e senza attrito). Le espressioni matematiche per le costanti di guadagno (attenuazione) sono derivate dalla relazione di dispersione per la propagazione a modo accoppiato che é ottenuta con l'aiuto di espressioni generalizzate per le equazioni di moto per ioni ed elettroni di reticolo ed equazioni di campo di Maxwell. Si é indagata l'esistenza dell'instabilità elicoidale di oscillazioni del suono. Si mostra che l'amplificazione di risonanza delle onde acustiche nel plasma con attrito per «piú» polarizzazione richiede che la velocità con attrito (V 0) sia piú grande della velocità del suono (i). Per polarizzazione «meno», d'altra parte, entrambe le onde decadono in plasma con attrito (V 0≠0) e senza attrito (V 0=0) indipendentemente dal fatto cheV 0 sia piú grande o piú piccola di 1.
    Notes: Summary The interaction of transverse phonons (acoustic waves) with helicons (helicon waves) is investigated in the long-wave-length limit and the conditions for resonance amplification (in drifted plasmas) and damping (in drifted and nondrifted plasmas) are discussed. The mathematical expressions for the gain (attenuation) constants are derived from the dispersion relation for coupled-mode propagation which is obtained with the aid of generalized expressions for the equations of motion for lattice ions and electrons and Maxwell's field equations. The existence of helicoidal instability of sound oscillations has been explored. It is found that resonance amplification of acoustic waves in the drifted plasma for «plus» polarization requires that the drift velocity (V o) be greater than the velocity of sound(s). For «minus» polarization, on the other hand, both the waves decay in drifted (V 0≠0) and nondrifted (V 0=0) plasmas irrespective of whetherV 0 is greater, or smaller thans.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02450655
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  • 4
    Electronic Resource
    Electronic Resource
    Formation of Equatorial Electrojet Current Layers (1967)
    [s.l.] : Nature Publishing Group
    Nature 214 (1967), S. 375-376 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The electrojet layer is generally considered to be a thin equatorial layer sandwiched between two non-conducting layers. In the equatorial region the magnetic field becomes horizontal and is perpendicular to the equatorial belt encircling the Earth. Because of the presence of a horizontal magnetic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/214375a0
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  • 5
    Electronic Resource
    Electronic Resource
    Enrichment of Bacillus subtilis Transformants by Zonal Centrifugation (1967)
    [s.l.] : Nature Publishing Group
    Nature 213 (1967), S. 1262-1263 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The media and transformation procedures were those of Anagnostopoulos and Spizizen4. B. subtilis strain 168 ind~ (indole requiring) was used as the recipient and B. subtilis 168 prototroph as the donor of DNA. The DNA was extracted by the method of Marmur6. About 10 ml. of a linear sucrose gradient ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2131262a0
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  • 6
    Electronic Resource
    Electronic Resource
    Comparison of Electron Temperature with Thermosphere Probe Data (1966)
    [s.l.] : Nature Publishing Group
    Nature 211 (1966), S. 1167-1168 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The atmospheric model, ionizing solar ultra-violet flux and their absorption cross-section for various atmospheric constituents are taken from the values tabulated by Davies7. The total rate of ion production and electron density distributions in the ionosphere have been calculated from these data ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2111167a0
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  • 7
    Electronic Resource
    Electronic Resource
    Isolation of Cyanophages from India (1967)
    [s.l.] : Nature Publishing Group
    Nature 216 (1967), S. 1020-1021 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] fig. 1. Placís of Anabaenopsis raciborskii. Figs. 2-4. Photomicrographs of lysates. (x 800, phase optics.) Figs. 2-3. Anabaenopsis circularíshowing trails of unlysed gas vacuoles and spores. Fig. 4. A. raciborskii showing unlysed heterocysts and gas vacuoles. The isolates on P. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2161020a0
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  • 8
    Electronic Resource
    Electronic Resource
    Genetic Recombination in a Blue-green Alga, Cylindrospermum majus Kuetz. (1965)
    [s.l.] : Nature Publishing Group
    Nature 207 (1965), S. 782-783 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Five clones of the alga grown from spores were isolated on the above medium. Out of these clones, one is non-sporulating (Fig. la) in successive repeated cultures for the past three years. It thus appears to be a mutant which has lost a genetic marker S involved in sporulation. The non-sporulating ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/207782a0
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  • 9
    Electronic Resource
    Electronic Resource
    Carlsberg Ridge, northern Indian Ocean: gravity and isostasy (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 119 (1994), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Gravity and bathymetry profiles across the Carlsberg Ridge in the Indian Ocean are analysed to investigate the isostatic compensation of this part of the Indian Ocean spreading ridge system. the ridge has a rough flanking topography and a median valley, which are the characteristics of slow-spreading ridges. We use the cross-spectral technique to obtain an admittance function for isostatic studies. Admittance estimates in the long-wavelength region (125-500 km) indicate that the elastic plate thickness supporting the long-wavelength topography is in the range 5-10 km. We have also examined the isostasy of the axial region. Synthetic topography and gravity profiles computed for a cooling plate model are subtracted from the observed, to estimate the median valley signatures. the residual gravity anomaly over the ridge axis is mostly explained by the median valley topography with a uniform crustal thickness of 6 km, indicating that the median valley is not in isostatic equilibrium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1994.tb00913.x
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  • 10
    Electronic Resource
    Electronic Resource
    Movement of the lithosphere-asthenosphere interface in response to erosion of thickened continental lithosphere: a moving boundary approach (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 122 (1995), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Models of retrograde metamorphism in many orogenic belts are based on crustal thickening and erosion of continental lithosphere. The pressure and temperature evolutions in such models are generally obtained by solving the advection diffusion equation with the lithosphere-asthenosphere boundary (LAB) either fixed at a specified depth or moving downwards at the same rate as erosion from the surface. However, this boundary is defined as a solid-partial-melt boundary in many geophysical interpretations. In the present work, we discuss a solution of the above problem considering the LAB as a phase boundary that moves. This solution is obtained by the Fourier series approach for a general case of surface erosion and basal heat transport. The results obtained for different models of crustal thickening show a significant movement of the LAB in response to erosion from the surface. A corresponding variation in the lithospheric thickness is also a significant result of this analysis. The earlier notion of a fixed-base lithosphere seems to be a good approximation when analysing metamorphic data, as we obtain nearly the same temperature profile in the crust as after including the LAB motion effect. However, the erosion of thickened crust is found to affect the lithospheric growth. These results indicate that metamorphic data (sampling the thermal structure of the upper lithosphere) do not preserve the signatures of such boundary motion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1995.tb07009.x
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