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Träfflista för sökning "(L773:0028 0836 OR L773:1476 4687) srt2:(1990-1999) srt2:(1994)"

Sökning: (L773:0028 0836 OR L773:1476 4687) srt2:(1990-1999) > (1994)

  • Resultat 1-6 av 6
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1.
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2.
  • Berggren, Magnus, et al. (författare)
  • Light-emitting diodes with variable colours from polymer blends
  • 1994
  • Ingår i: Nature. - : Nature Publishing Group. - 0028-0836 .- 1476-4687. ; 372:6505, s. 444-446
  • Tidskriftsartikel (refereegranskat)abstract
    • THE range of materials now available for polymer-based light-emitting diodes (LEDs) is such that electroluminescence can be obtained throughout the visible spectrum(1-12). Here we show that, by blending polymers with different emission and charge-transport characteristics, LEDs can be fabricated in which the emission colour varies as a function of the operating voltage. This phenomenon arises from the self-organizing properties of the blends, in which entropy drives phase separation of the constituent polymers and gives rise to submicrometre-sized domains having a range of compositions and emission characteristics. Emission from domains of different composition is controlled by the ease with which charge is injected, which in turn depends on the applied voltage.
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3.
  • Hill, Russell, et al. (författare)
  • Origin of Life
  • 1994
  • Ingår i: Nature. - 0028-0836 .- 1476-4687. ; 371, s. 646-
  • Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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4.
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5.
  • Olsson, Mats, 1960, et al. (författare)
  • Rewards of 'promiscuity'.
  • 1994
  • Ingår i: Nature. - 0028-0836 .- 1476-4687. ; 372
  • Tidskriftsartikel (refereegranskat)
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6.
  • Wittung, Pernilla, 1968, et al. (författare)
  • DNA-LIKE DOUBLE HELIX FORMED BY PEPTIDE NUCLEIC-ACID
  • 1994
  • Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 368:6471, s. 561-563
  • Tidskriftsartikel (refereegranskat)abstract
    • ALTHOUGH the importance of the nucleobases in the DNA double helix is well understood, the evolutionary significance of the deoxyribose phosphate backbone and the contribution of this chemical entity to the overall helical structure and stability of the double helix is not so clear. Peptide nucleic acid (PNA)1-7 is a DNA analogue with a backbone consisting of N-(2-aminoethyl)glycine units (Fig. 1) which has been shown to mimic DNA in forming Watson-Crick complementary duplexes with normal DNA7. Using circular dichroism spectroscopy we show here that two complementary PNA strands can hybridize to one another to form a helical duplex. There is a seeding of preferred chirality which is induced by the presence of an L- (or D-) lysine residue attached at the carboxy terminus of the PNA strand. These results indicate that a (deoxy)ribose phosphate backbone is not an essential requirement for the formation of double helical DNA-like structures in solution.
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  • Resultat 1-6 av 6

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