The Editor-in-Chief is issuing an Editorial Expression of Concern for this article. The editorial team received a request from the corresponding author to retract the article due to being unable to reproduce the results. Unfortunately, the editorial team has been unable to obtain further information from the authors related to the specific issues with the article.

None of the authors have responded to any further correspondence from the editor. The authors’ institution has not responded to a request for clarification. The Editor-in-Chief advises readers to interpret the results with caution.

The original article can be found online at https://doi.org/10.1134/S000629791705008X.