Astronomische NachrichtenVolume 344, Issue 6 e239006 ISSUE INFORMATIONFree Access Information: Astron. Nachr. 06/2023 First published: 24 August 2023 https://doi.org/10.1002/asna.20239006AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text full-text accessPlease review our Terms and Conditions of Use check box below share version ar...

The presence of the DNA repair protein, 06-alkylguanine-DNA alkyltransferase (AGT) in tumor cells is a significant source of resistance to chemotherapeutic alkylnitrosoureas and alkyltriazenes. 06-Benzylguanine provides a means to effectively inactivate the AGT protein and increase the chemotherapeutic effectiveness of chloroethylating and methylating agents in vitro and in human tumor xenograf...

Artistic representations of the cosmic contraction and expansion phases branch-cut universe evolution scenarios. On left figure, evolves from negative to positive values imaginary cosmological time ti, circumventing continuously branch-cut; no primordial singularity occurs, only branch points. right point disappear after “realisation” by means a Wick rotation, which is replaced here real contin...