By Gould R.F. (ed.)
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Eukaryotic cells include a plurality of organelles exclusive through their particular membranes and contents. Their biogenesis happens via progress and department of preexisting buildings instead of de novo. Mitochondria and chloroplasts, which seem to be descended from prokaryotic ancestors, have retained a few DNA and the biosynthetic power for its expression.
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Extra resources for Agricultural Applications of Petroleum Products
1978; Grivell et al. 1979). Addi tional sequences, coding for approximately 400 - 800 nucleotides of the 5' portion of the 18s mRNA are located leftwards of the HindIII site in a, but these have not yet been mapped accurately. , pers. ). The hat~hed region in insert IlIA represents the reading frame that is linked to a by the removal of 10S RNA (see text). (Modified from Van Ommen et al. 1980) for subunit I of oxidase and, although it seems likely that the inserts in this region will be introns, this remains to be proven.
The circles represent the mitochondrial genomes of Saccharomyes cerevisiae KL14-4A, 777-3A, JSl-3D and D273-10B and S. carlsbergensis NCYC 74. The mitochondrial loci cob and oxi-3 and the genes for the 21S and· 15S rRNAs are shown as closed bars. The cross-hatched region on the oxi-3 bar indicates that many oxi-3 transcripts have short regions of homology with the adjacent oli-2 region (Van Ommen et al. 1979). The open bars represent the various large insertions responsible for size differences of mitochondrial loci in different yeast strains.
Carlsbergensis (.. ). The approximate positions of 48 RNA genes is given on the outer circle of the major ring (11). The open squares represent methionine-tRNA genes. The positions of the transcripts are shown outside the map, the thin lines indicating uncertainty in the exact location and the heavy bars their approximate length. Openings in the RNA bars correspond to the positions of intervening sequences in DNA. Homology with inserted regions is indicated by dotted lines. (From Van Ommen et al.