Figure 6. The p2 scores for amino acids from the cell wall extracts of S. epidermidis and S. lugdunensis following prolonged exposure at 4°C for 8 weeks compared with corresponding cultures grown under ideal conditions at 37°C representing the reference control samples.

S. epidermidis and S. lugdunensis responded to the cold stress by substantially altering amino acid profiles relative to the respective controls. It should be emphasized that the PC2 were inversely correlated to cold treatment such that negative loadings, e.g. - 0,20 for GLN, indicated increased amino acid levels in the cold treated S. epidermidis and S. lugdunensis samples, and vice versa.