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Polyurethane has a microphase separation structure, while polyethylene glycol (PEG) can form a hydrated layer to resist protein adsorption. In this paper, PEG was introduced to polyurethane to improve the antifouling properties of the polyurethane, providing a new method and idea for the preparation of new antifouling polyurethane materials. The mechanical properties, hydrophilicity, swelling degree, microphase separation and antifouling performance of the coatings were evaluated. The response characteristics of the polyurethane coatings in a seawater environment were studied, and the performance changes of coatings in seawater were tested. The results showed that the crystallized PEG soft segments increased, promoting microphase separation. The stress at 100% and the elasticity modulus of the polyurethane material also markedly increased, in addition to increases in the swelling degree in seawater, the water contact angle decreased. A total of 25% of PEG incorporated into a soft segment can markedly improve the antibacterial properties of the coatings, but adding more PEG has little significant effect. After immersion in seawater, the coatings became softer and more elastic. This is because water molecules formed hydrogen bonding with the amino NH, which resulted in a weakening effect being exerted on the carbonyl C=O hydrogen bonding and ether oxygen group crystallization.

Versión postprint próximamente disponible en: http://hdl.handle.net/10261/228202, The response to DNA damage is critical for cellular homeostasis, tumor suppression, immunity and gametogenesis. In order to provide an unbiased and global view of the DNA damage response in human cells, we undertook 28 CRISPR/Cas9 screens against 25 genotoxic agents in the retinal pigment epithelium-1 (RPE1) cell line. These screens identified 840 genes whose loss causes either sensitivity or resistance to DNA damaging agents. Mining this dataset, we uncovered that ERCC6L2, which is mutated in a bone-marrow failure syndrome, codes for a canonical non-homologous end-joining pathway factor; that the RNA polymerase II component ELOF1 modulates the response to transcription-blocking agents and that the cytotoxicity of the G-quadruplex ligand pyridostatin involves trapping topoisomerase II on DNA. This map of the DNA damage response provides a rich resource to study this fundamental cellular system and has implications for the development and use of genotoxic agents in cancer therapy., AAQ, GSM and AMH are recipients of long-term EMBO fellowships (ALTF 910-2017, 795-2017 under a CC-BY-NC-ND 4.0 International license. not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available bioRxiv preprint doi: https://doi.org/10.1101/845446; this version posted November 18, 2019. The copyright holder for this preprint (which was 27 and 124-2019, respectively), NH was supported by a Human Frontier Science Program long-term Fellowship, SER is supported by a fellowship from AIRC and SA was a Banting post-doctoral fellow. ASB was supported by a PhD Studentship from AEFAT (Asociación Española Familia Ataxia Telangiectasia) and an EMBO short-term fellowship for a visit to the DD laboratory. The ICRF187 screen in FCL laboratory was funded by grants from the Spanish Government (SAF2017- 89619-R, European Regional Development Fund) and the European Research Council (ERC-CoG2014-647359). Work in the RSW laboratory was supported in part by the US National Institute of Health Intramural Program, US National Institute of Environmental Health Sciences (NIEHS, 1Z01ES102765). DD is a Canada Research Chair (Tier I) and the work was supported from grants from the CIHR (FDN143343 to DD; FRN 123518, PJT-156330 to AM) Canadian Cancer Society grant 705644 (to DD) with additional support to DD from the Krembil Foundation.