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      Active Oxygen Species and Mechanism for Low-Temperature CO Oxidation Reaction on a TiO2-Supported Au Catalyst Prepared from Au(PPh3)(NO3) and As-Precipitated Titanium Hydroxide

      , , , , ,
      Journal of Catalysis
      Elsevier BV

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          Total Oxidation of Carbon-Monoxide and Methane over Transition Metal Fluorite Oxide Composite Catalysts

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            Low temperature CO oxidation over Au/TiO2 and Au/SiO2 catalysts

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              A recent common ancestry for human Y chromosomes.

              The male-specific portion of the Y chromosome is especially useful for studies of human origins. Patterns of nucleotide variation that are neutral with respect to fitness should permit estimates of when and where ancestral Y chromosomes existed. However, variation on the human Y chromosome has been observed to be greatly reduced relative to the autosomes and the X chromosome. One explanation is that selection for a favourable mutation on the non-recombining portion of the Y chromosome has resulted in the recent fixation of a single Y haplotype. A 2.6-kilobase fragment encompassing a polymorphic Alu insertion was sequenced from 16 human and four chimpanzee Y chromosomes. Patterns of nucleotide sequence diversity and divergence provide no evidence for a recent, strong selective sweep on the human Y chromosome. The time back to a common ancestral human Y chromosome is estimated to be 188,000 years, with a 95% confidence interval from 51,000 to 411,000 years. These results are consistent with autosomal and mitochondrial DNA studies that suggest a long-term human effective population size of 10,000 and a sex ratio of 1 (ref. 7). These inferences contradict predictions of the multiregional hypothesis positing a widespread transformation of Homo erectus populations into Homo sapiens.
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                Author and article information

                Journal
                Journal of Catalysis
                Journal of Catalysis
                Elsevier BV
                00219517
                July 1999
                July 1999
                : 185
                : 2
                : 252-264
                Article
                10.1006/jcat.1999.2517
                4179202b-2eb0-4fb3-a69f-c972771d5c61
                © 1999

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

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