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  1. No Access

    Article

    Amino acids from ultraviolet irradiation of interstellar ice analogues

    Amino acids are the essential molecular components of living organisms on Earth, but the proposed mechanisms for their spontaneous generation have been unable to account for their presence in Earth's early his...

    G. M. Muñoz Caro, U. J. Meierhenrich, W. A. Schutte, B. Barbier… in Nature (2002)

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    Article

    Dust particle impacts during the Giotto encounter with comet Grigg–Skjellerup

    IN the European Space Agency's 1992 Giotto Extended Mission, the Dust Impact Detection System operated successfully during a fly-by that took the spacecraft within about 200 km of the nucleus of comet Grigg–Sk...

    J. A. M. McDonnell, N. McBride, R. Beard, E. Bussoletti, L. Colangeli… in Nature (1993)

  3. No Access

    Article

    Segmental and developmental regulation of a presumptive T-cell oncogene in the central nervous system

    ALTHOUGH most proto-oncogenes such as c-myc are involved in cell proliferation, being expressed in a wide range of tissues as well as in progenitors of transformed cells1, others may normally function in cellular...

    J. M. Greenberg, T. Boehm, M. V. Sofroniew, R. J. Keynes, S. C. Barton… in Nature (1990)

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    Chapter

    Broadband Structure in the Interstellar Extinction Curve

    We have analysed observations of the interstellar extinction in the range 3400 Å–11000 Å. The observations have high photometric accuracy and wavelength resolution, and allow a detailed examination of broadban...

    D. S. Hayes, G. E. Mavko, R. R. Radick, K. H. Rex… in Interstellar Dust and Related Topics (1973)

  5. No Access

    Article

    Can Solid Hydrogen condense on Interstellar Grains?

    IT has been suggested1,2 that the temperatures of some interstellar grains may be low enough for the condensation of solid hydrogen on their surfaces. The questions of grain temperature and vapour pressure of sol...

    J. M. GREENBERG, T. DE JONG in Nature (1969)