Barely Significant

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Based on the abundance trends across species, the lipids were grouped into four major variation patterns: (1) Clusters 1, 6, and 10 exhibited significantly higher lipid content in GHJ than in RHJ and TJ, with no consistent difference between the latter two; (2) Clusters 2, 3, and 9 showed the opposite trend, with the lowest abundance in GHJ; (3) Clusters 4, 7, and 8 displayed a progressive increase in lipid content from RHJ to TJ, most markedly in Cluster 7; and (4) Cluster 5 showed a decreasing trend from RHJ to TJ ( Figure 2 B).
By comparing PM samples of 0, 20, and 50 years of age, this study found that with increasing PM age, lactic acid content exhibited a decreasing trend, while caproic acid content and the abundances of related functional microorganisms ( Petrimonas , Caproiciproducens , and Sedimentibacter ) showed an increasing trend.