Correlations between log2 based expression ratios from transcriptomic and proteomic studies at exponential phase (ethanol-treated cell at 10 h versus control cells at 6 h).

a: The direction of comparison; 1: from significant protein list to identify their corresponding genes for correlation; 2: from significant gene list to identify their corresponding proteins for correlation; 3: both the proteins and their corresponding genes used for correlation calculation have same statistical significant differential expression level, and the results of comparisons are same from either directions. P: proteomics, A: transcriptomics; S: statistically significant, 1.5: at least 1.5-fold difference; 2.0: at least 2-fold difference. The numbers for proteomic and transcriptomic studies before comparison are: P: 942; SP: 95 (94 proteins with corresponding gene expression were used for SP); SP1.5: 84; SP2.0: 61; A: 1694; SA: 912; SA1.5: 174; SA2.0: 48. Number: the number of gene-protein pairs after comparison; Correlation: the R-squared number between the log2 based expression ratio (ethanol-treated cell versus control cells) of proteins identified from proteomics and log2 based expression ratio (ethanol-treated cell versus control cells) of genes identified from microarray. →: the direction for comparison; For example, P→A is to identify the corresponding genes in microarray data from the protein list of proteomic data. SP1.5→A is to identify the corresponding genes in microarray data from the protein list of proteomic data with at least 1.5-fold changes.