Up to June 26th, PLoS, a academic publisher in the United States, had retracted 93 articles on the journal "PLoS ONE" due to "potential manipulation of the publication process" and related issues, such as "peer review integrity" and "concerns about the authorship".
Anomalies can be observed on the XPS spectrum (Figure 8) of this article, but the cause is unknown.
Abnormal noise-free baseline was observed from the EDX spectrum in Figure 2(a) of this article