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  • Electronic Resource  (12)
  • 1990-1994  (12)
  • 1
    Electronic Resource
    Electronic Resource
    A Supernova at z = 0.458 and Cosmology (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 688 (1993), 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.1749-6632.1993.tb43936.x
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  • 2
    Electronic Resource
    Electronic Resource
    Production of bioemulsifier by a SCP-producing strain ofCandida tropicalis during hydrocarbon fermentation (1990)
    Springer
    Biotechnology letters 12 (1990), S. 743-746 
    Details
    ISSN: 1573-6776
    Source: Springer Online Journal Archives 1860-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary SCP producingCandida tropicalis, when grown in fed batch culture using n-hexadecane as carbon substrate, exhibited extracellular emulsifier production. The emulsifier showed activity against various hydrocarbons, maximum with aromatics and least with normal paraffins. Higher emulsification activity was noted in nitrogen-limiting growth conditions than in substrate- limiting conditions. The hot water extract of the cells also showed significant emulsification activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01024732
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  • 3
    Electronic Resource
    Electronic Resource
    Anaerobic biodegradation of a petrochemical waste-water using biomass support particles (1994)
    Springer
    Applied microbiology and biotechnology 40 (1994), S. 768-771 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract. During the anaerobic biodegradation of effluent from a dimethyl terephthalate (DMT) manufacturing plant, reduction in chemical oxygen demand (COD) degradation and biogas formation was observed after the waste-water concentration exceeded 25% of added feed COD. This condition reverted back to normal after 25–30 days when the DMT waste-water concentration in the feed was brought down to a non-toxic level. However, the above effects were observed only after the concentration of DMT waste-water reached more than 75% of added feed COD when biomass support particles (BSP) were augmented to the system. In the BSP system, a biomass concentration of up to 7000 mg/l was retained and the sludge retention time increased to 〉200 days compared to 2200 mg/l and 8–10 days, respectively, in the system without BSP (control). Formaldehyde in the waste-water was found to be responsible for the observed toxicity. The BSP system was found to resist formaldehyde toxicity of up to 375 mg/l as against 125 mg/l in the control system. Moreover, the BSP system recovered from the toxicity much faster (15 days) than the control (25–30 days). The advantages of the BSP system in anaerobic treatment of DMT waste-water are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530050064
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  • 4
    Electronic Resource
    Electronic Resource
    Anaerobic biodegradation of a petrochemical waste-water using biomass support particles (1994)
    Springer
    Applied microbiology and biotechnology 40 (1994), S. 768-771 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract During the anaerobic biodegradation of effluent from a dimethyl terephthalate (DMT) manufacturing plant, reduction in chemical oxygen demand (COD) degradation and biogas formation was observed after the waste-water concentration exceeded 25% of added feed COD. This condition reverted back to normal after 25–30 days when the DMT waste-water concentration in the feed was brought down to a non-toxic level. However, the above effects were observed only after the concentration of DMT waste-water reached more than 75% of added feed COD when biomass support particles (BSP) were augmented to the system. In the BSP system, a biomass concentration of up to 7000 mg/l was retained and the sludge retention time increased to 〉 200 days compared to 2200 mg/l and 8–10 days, respectively, in the system without BSP (control). Formaldehyde in the waste-water was found to be responsible for the observed toxicity. The BSP system was found to resist formaldehyde toxicity of up to 375 mg/l as against 125 mg/l in the control system. Moreover, the BSP system recovered from the toxicity much faster (15 days) than the control (25–30 days). The advantages of the BSP system in anaerobic treatment of DMT waste-water are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00173343
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  • 5
    Electronic Resource
    Electronic Resource
    The interfringe intensity in coronal interferograms (1994)
    Springer
    Experimental astronomy 5 (1994), S. 289-299 
    Details
    ISSN: 1572-9508
    Keywords: Astronomical Instrumentation ; Sun: corona
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paper discusses the low contrast of the Fabry-Perot (FP) fringes observed in the interferograms of the solar corona. The various factors which affect the interfringe intensity of Fabry-Pérot line profiles are considered. The effect of continuum radiation on the interfringe intensity of Fabry-Pérot line profiles is calculated by assuming a coronal model. For the given FP, it was found that unless the ratio of line to continuum intensity (integrated line intensity to continuum per angström) is less than 10, continuum contribution has no significant effect on the fringe contrast. The analysis may be pertinent in the design aspects of a FP interferometer for astronomical observations. The excess interfringe intensity found in the coronal line profiles is interpreted as due to the presence of fast moving plasma components in corona along the line of sight. A detailed analysis qualitatively shows that the line excitation conditions existing in ambient corona and coronal loops are different in active regions while they are more similar in polar regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01583702
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  • 6
    Electronic Resource
    Electronic Resource
    The excitation mechanism and the line-to-continuum intensity ratio of the [Fexiv] 5303 Å line in various coronal regions (1993)
    Springer
    Solar physics 147 (1993), S. 255-261 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The excitation mechanism of the coronal green line in various coronal regions is studied. The line-to-continuum intensity ratio is calculated using the model electron density values given by Newkirk (1961) and is compared with the observed values. Reasonably good agreement is found between the model calculations and observed values. The model calculations show that collisional excitation is more important in the innermost regions while radiative contribution progressively increases towards outer regions. The individual contributions depend strongly on the activity of the particular coronal region. An increased contribution from collisional excitation is seen in coronal active regions owing to the large electron density. A contour map of the line-to-continuum intensity ratio as derived from the observations, is plotted. At 1.10R⊙ the value is about 80 in active regions, 30–40 in coronal streamers, while it is less than 10 in polar regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690716
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  • 7
    Electronic Resource
    Electronic Resource
    Fabry-Pérot line profiles in the λ5303 å and λ6374 å coronal lines obtained during the 1983 Indonesian eclipse (1991)
    Springer
    Solar physics 131 (1991), S. 25-39 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract During the total solar eclipse of 11 June, 1983, an imaging dual-channel Fabry-Pérot interferometer was used to obtain line profiles simultaneously in the green λ5303 Å [Fe xiv] and the red λ6374 Å [Fe x] coronal lines at various positions in the corona. Extensive microdensitometry followed by multi-Gaussian curve-fitting analysis has resulted in the determination of coronal temperatures and velocity separations between different pockets of coronal gas in the line of sight over a large extent of the corona. Fewer high temperature zones are to be found in the corona of 1983 compared with our similar green-line measurements of the solar maximum corona of 1980. The data are consistent with a temperature maximum occurring at 1.2 R ⊙, as found at the 1980 eclipse, but our new data are insufficient to observe farther out than this radius and so determine the position of a maximum. The velocity field in the corona at the 1983 eclipse is less structured compared with that at the 1980 eclipse and is mainly confined to the zone 20–30km s−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151741
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  • 8
    Electronic Resource
    Electronic Resource
    The plasma condensation region in the coma of Halley's Comet (1991)
    Springer
    Earth, moon and planets 52 (1991), S. 213-232 
    Details
    ISSN: 1573-0794
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The cometary images taken on 1986 January 8.590 and 8.638 UT (R-0.9 AU, δ ~ 1.29 AU) at Gurushikhar, Mt. Abu, India (24 °39′ N, 72 °43′ E alt: 1700 m) show distinct condensation region in the tail direction. The size of the condensation region is 4 × 103 km. The condensation region showed up strongly in the blue emission, implying the abundance of CO+. It was inferred to be moving with a velocity of 37 ± 3 km/s relative to the comet at a distance of 2.3 × 105 km from the nucleus in the tailward direction. The analysis show that the condensation was a result of rapid ionization mechanism, with a time scale of \~103 to 104 sec. The most probable mechanism for producing the ionization region was found to be the discharge of cross tail electric current passing through the neutral sheet in the near nucleus region followed by an outburst observed in IR wavelengths at 8.1 UT. It was accelerated by J × B drift at a rate of ~24 cm/sec2 to the position observed by us. This feature, most probably is the precursor of the first dramatic Disconnection Event (DE) observed in Halley's Comet at Jan.10.375 UT. This supports the conjecture that the tail features originate in the coma with a velocity of ~20–40 km/s.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00140876
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  • 9
    Electronic Resource
    Electronic Resource
    A kinematic study of orion nebula in the emission line [S II] 6731 Å (1993)
    Springer
    Astrophysics and space science 204 (1993), S. 205-212 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Fabry-Perot Interferometric observations were made on Orion Nebula in the forbidden emission line [S II] 6731 Å line. The observed field is about 6′ × 6′ on the face of the nebula and it covers the Orion Trapezium stars and the nearby regions. The relative line of sight velocities which denote the average deviations from the systematic velocities were derived at a large number of points in the nebula. Velocities were found to show a gradient towards the north of Trapezium stars. Large blue shifted velocities were found at the nebular boundaries, probably associated with the ionization fronts. The observed velocities, in general, show agreement with the flow model of Balick, Gull and Smith (1980).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658025
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  • 10
    Electronic Resource
    Electronic Resource
    Biodegradation of slop oil from a petrochemical industry and bioreclamation of slop oil contaminated soil (1994)
    Springer
    World journal of microbiology and biotechnology 10 (1994), S. 653-656 
    Details
    ISSN: 1573-0972
    Keywords: Biodegradation ; bioreclamation ; petrochemical waste oil ; phytotoxicity ; soil contamination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Slop oil, i.e. waste oil from a petrochemical complex, contains at least 240 hydrocarbon components, of which 54% are from C5 to C11 and the rest from C12 to C23. Of 22 isolated bacterial cultures that were able to degrade slop oil, seven could each degrade about 40% of the slop oil, and a mixture of all seven could degrade ≤50% in liquid medium. Bioaugmentation of soil contaminated with slop oil with the mixed bacterial culture gave up to 70% degradation of slop oil after 30 days. This compares with 40% degradation without bioaugmentation. Bioaugmentation led to a significant increase in counts of bacteria able to degrade slop oil. Wheat sown on bioaugmented soil germinated and grew better than on non-augmented soil and led to increased degradation of slop oil (up to 80%). This indicates the potential of mixed culture for bioremediation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00327953
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