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      Taphonomy of insects in carbonates and amber

      , ,

      Palaeogeography, Palaeoclimatology, Palaeoecology

      Elsevier BV

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          Instability and decay of the primary structure of DNA.

           T Lindahl (1993)
          Although DNA is the carrier of genetic information, it has limited chemical stability. Hydrolysis, oxidation and nonenzymatic methylation of DNA occur at significant rates in vivo, and are counteracted by specific DNA repair processes. The spontaneous decay of DNA is likely to be a major factor in mutagenesis, carcinogenesis and ageing, and also sets limits for the recovery of DNA fragments from fossils.
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            Ancient DNA: Do It Right or Not at All

             A A Cooper (2000)
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              Increased damage from fires in logged forests during droughts caused by El Niño.

              In 1997-98, fires associated with an exceptional drought caused by the El Niño/Southern Oscillation (ENSO) devastated large areas of tropical rain forests worldwide. Evidence suggests that in tropical rainforest environments selective logging may lead to an increased susceptibility of forests to fire. We investigated whether this was true in the Indonesian fires, the largest fire disaster ever observed. We performed a multiscale analysis using coarse- and high-resolution optical and radar satellite imagery assisted by ground and aerial surveys to assess the extent of the fire-damaged area and the effect on vegetation in East Kalimantan on the island of Borneo. A total of 5.2 +/- 0.3 million hectares including 2.6 million hectares of forest was burned with varying degrees of damage. Forest fires primarily affected recently logged forests; primary forests or those logged long ago were less affected. These results support the hypothesis of positive feedback between logging and fire occurrence. The fires severely damaged the remaining forests and significantly increased the risk of recurrent fire disasters by leaving huge amounts of dead flammable wood.
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                Author and article information

                Journal
                Palaeogeography, Palaeoclimatology, Palaeoecology
                Palaeogeography, Palaeoclimatology, Palaeoecology
                Elsevier BV
                00310182
                January 2004
                January 2004
                : 203
                : 1-2
                : 19-64
                Article
                10.1016/S0031-0182(03)00643-6
                © 2004

                http://www.elsevier.com/tdm/userlicense/1.0/

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