Natural maturity sequences

The variation in the TR with depth for three other natural maturity sequences (Mahakam Delta, Paris Basin, North Sea) is plotted with that for the Monterey Fm. in Figure 4. While the geothermal histories of these sequences are different, there is in each case a strong relationship between maximum temperature experienced by the sample and depth. Depth is therefore used here as a common maturity axis for comparative purposes. Each of these sequences show a slight but significant decrease in this ratio with increasing depth. The extent of the decrease is, however, less dramatic than that for the Monterey sequence due mainly to their lower initial organic sulfur contents. 

Natural Maturity sequences. Figure 10 shows FPD chromatograms of the pyrolysates of seven Mahakam coal samples studied by flash pyrolysis. Peak identifications are listed in Table V. 

A compositional kinetic model of hydrocarbon generation for a marine Type II source rock was developed based on data from closed-system non-isothermal pyrolysis experiments. The model predictions were tuned to a natural maturity sequence. The compositional data format chosen is compatible with the compositional resolution used in reservoir engineering, and allows a direct comparison of predicted compositions and phase behaviour to PVT data of natural fluids. 

For example, a polypeptide is synthesized as a linear polymer derived from the 20 natural amino acids by translation of a nucleotide sequence present in a messenger RNA (mRNA). The mature protein exists as a weU-defined three-dimensional stmcture. The information necessary to specify the final (tertiary) stmcture of the protein is present in the molecule itself, in the form of the specific sequence of amino acids that form the protein (57). This information is used in the form of myriad noncovalent interactions (such as those in Table 1) that first form relatively simple local stmctural motifs (helix... 

Most cellular genes are composed of intron and exon sequences. During maturation of the RNA transcript, the introns are excised and the exons are ligated together. This processing step also facilitates export of RNA from the nucleus into the cytoplasm for protein translation. At least one intron and one exon are almost always included in the therapeutic expression cassette to ensure that the engineered transcript is processed in the same manner as the natural cellular transcript. 

---