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  • 11
    Electronic Resource
    Electronic Resource
    Interstellar extinction by spheroidal absorbing dust grains (1987)
    Springer
    Astrophysics and space science 129 (1987), S. 335-337 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract On the basis of exact computations of the extinction efficiencies of spheroidal absorbing particles, numerical calculations of the extinction curves have been made for a distribution of particle sizes. The results are presented and compared with the observed interstellar extinction. For the sake of comparison, results for the nonabsorbing particles are also given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642651
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  • 12
    Electronic Resource
    Electronic Resource
    Segregation of dust grains in dark clouds (1982)
    Springer
    Astrophysics and space science 84 (1982), S. 163-172 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Gravitational settling of dust grains in dark clouds has been considered. It has been shown that such a process gives rise to a modification of the grain size distribution. Starting with a simple model of uniform spherical cloud and normal interstellar grain size distribution for the dust we derive expressions for the modified grain size distribution function, average grain size and extinction as functions of distance from the cloud's center and the age of the cloud. The mean grain size increases towards the center of the cloud as does the extinction. Results of the numerical evaluation of these quantities have been discussed with their implications for the observations of anomalous reddening and polarization within dark clouds and Bok globules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00713634
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  • 13
    Electronic Resource
    Electronic Resource
    Phosphate transport inClaviceps sp. strain SD-58 (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 96-97 
    Details
    ISSN: 1420-9071
    Keywords: Claviceps ; fungus, ergot ; ergot fungus ; phosphate uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Phosphate uptake inClaviceps sp. strain SD-58 was found to be linear for 20 min, proportional to cell density in mg/ml, energy dependent, and taking place against a concentration gradient with a Km value of 45.45×10−5 M. Osmotic shock treatment to the cell caused a reduction in phosphate uptake associated with the release of binding protein. Partial restoration of uptake was observed on incubation of osmotically shocked cells with shock fluid. The results are discussed with reference to the effect of phosphate on alkaloid synthesis inClaviceps sp. strain SD-58.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02005894
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  • 14
    Electronic Resource
    Electronic Resource
    Assimilation of ammonia and growth of biotin deficientAspergillus nidulans (1976)
    Springer
    Cellular and molecular life sciences 32 (1976), S. 423-424 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Biotin deficiency inAspergillus nidulans has been found to increase the uptake of ammonium ions, associated with a marked increase in the activity of NADP-linked glutamate dehydrogenase, which is found to be the major route of ammonia assimilation in this culture. The results obtained are discussed with respect to the growth ofAspergillus nidulans during biotin deficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01920773
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  • 15
    Electronic Resource
    Electronic Resource
    Regulation of ammonia uptake inAspergillus nidulans (1977)
    Springer
    Cellular and molecular life sciences 33 (1977), S. 1592-1593 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ammonia uptake inA. nidulans was found to be linear for about 20 min, and was proportional up to 1.5 mg/ml dry cell density. The transport of ammonia does not involve energy. Normal and biotin deficientA. nidulans showed an identical Km-values of 10.26×10−5 M ammonia for uptake. The uptake of ammonium ion has been shown to be regulated by the intracellular concentration of ammonia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01934016
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  • 16
    Electronic Resource
    Electronic Resource
    Regulation of glucose transport in Aspergillus nidulans (1977)
    Springer
    Cellular and molecular life sciences 33 (1977), S. 726-727 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Pyruvate and acetate inhibited the uptake of glucose by Aspergillus nidulans; although there were significant variations in glucose uptake rate, the intracellular concentration of acetate was almost identical in biotin-supplemented, normal and deficient cells. The in vitro activity of glucose-binding protein was not affected by biotin, avidin, acetate or acetyl-CoA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01944152
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  • 17
    Electronic Resource
    Electronic Resource
    The temperature and wavelength dependence of the photo-oxidation of propionaldehyde
    Amsterdam : Elsevier
    Journal of Photochemistry 34 (1986), S. 117-135 
    Details
    ISSN: 0047-2670
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0047-2670(86)85014-6
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  • 18
    Electronic Resource
    Electronic Resource
    The wavelength dependence of the photo-oxidation of CH"2O
    Amsterdam : Elsevier
    Journal of Photochemistry 40 (1987), S. 23-29 
    Details
    ISSN: 0047-2670
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0047-2670(87)87041-7
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  • 19
    Electronic Resource
    Electronic Resource
    Phenolic aldehydes and aldoximes as indicators for direct titration of ferric ions with diethylenetriaminepentaacetic acid (DTPA) (1982)
    Springer
    Microchimica acta 78 (1982), S. 311-315 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Sechs phenolische Aldehyde bzw. deren Oxime bewährten sich als ausgezeichnete Indikatoren für die direkte Titration von Eisen (III) mit DTPA bei pH 1,0. Die geringste titrierbare Menge beträgt 56μg/ml. Die Reaktion ist sehr selektiv und eignet sich für die Analyse von Erzen und eisenhältigen Drogen.
    Notes: Summary Fifteen phenolic aldehydes and aldoximes have been investigated as indicators for the direct titration of iron(III) ions with diethylene triaminepentaacetic acid. Six substances are found to be excellent indicators which permit direct titration of iron(III) with DTPA even at pH 1.0. Microtitrations are feasible with these indicators, the minimum titratable amount being 56μg/ml. The process is very selective and can be applied to the analysis of ores and drugs containing iron.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01206934
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  • 20
    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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