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Objectives: Moral distress is associated with adverse outcomes contributing to health-care professionals' worsened mental and physical well-being. Medical social workers have been frontline care providers throughout the COVID-19 pandemic, and those specializing in palliative and hospice care have been particularly affected by the overwhelming numbers of those seriously ill and dying. The main objectives of this study were (1) to assess palliative and hospice social workers' experiences of moral distress during COVID-19 and (2) to identify and describe participants' most morally distressing scenarios., Methods: Using a mixed-methods approach, participants completed an online survey consisting of the Moral Distress Thermometer (MDT) and open-ended text responses., Results: A total of 120 social work participants responded to the study, and the majority of participants (81.4%) had experienced moral distress with an average MDT score of 6.16. COVID-19 restrictions emerged as the main source of moral distress, and an overlap between the clinical and system levels was observed. Primary sources of moral distress were grounded in strict visitation policies and system-level standards that impacted best practices and personal obligations in navigating both work responsibilities and safety., Significance: In the first year of the COVID-19 pandemic, palliative and hospice social work participants indicated high levels of moral distress. Qualitative findings from this study promote awareness of the kinds of distressing situations palliative and hospice social workers may experience. This knowledge can have education, practice, and policy implications and supports the need for research to explore this aspect of professional social work.

Family S9 prolyl oligopeptidases (POPs) are of interest as pharmacological targets. We recently found that an S9 POP from Pleurotus eryngii showed altered substrate specificity following H 2 O 2 treatment. Oxidation of Met203 on the non-catalytic β-propeller domain resulted in decreased activity toward non-aromatic aminoacyl-para-nitroanilides (pNAs) while maintaining its activity toward aromatic aminoacyl-pNAs. Given that the other Met residues should also be oxidized by H 2 O 2 treatment, we constructed mutants in which all the Met residues were substituted with other amino acids. Analysis of the mutants showed that Met570 in the catalytic domain is another potent residue for the altered substrate specificity following oxidation. Met203 and Met570 lie on the surfaces of two different domains and form part of a funnel from the surface to the active center. Our findings indicate that the funnel forms the substrate pathway and plays a role in substrate recognition.

On clinical application of biodegradable injectable polymer (IP) systems, quick extemporaneous preparation of IP formulations and longer duration time gel state after injection into the body are the important targets to be developed. Previously, we had reported temperature-responsive covalent gelation systems via bio-orthogonal thiol-ene reaction by 'mixing strategy' of amphiphilic biodegradable tri-block copolymer (tri-PCG) attaching acryloyl groups on both termini (tri-PCG-Acryl) with reactive polythiol. In other previous works, we found 'freeze-dry with PEG/dispersion' method as quick extemporaneous preparation method of biodegradable IP formulations. In this study, we applied this quick preparative method to the temperature-triggered covalent gelation system. The instant formulation (D-sample) could be prepared by 'freeze-dry with PEG/dispersion' just mixing of tri-PCG-Acryl micelle dispersion and tri-PCG/DPMP micelle dispersion with PEG, that can be prepared in 30 s from the dried samples. The obtained D-sample showed irreversible gelation and long duration time of gel state, which was basically the same as the formulations prepared by the usual heating dissolution method (S-sample). Interestingly, the D-sample could maintain its sol state for a longer time (24 h) after preparing the formulation at r.t. compared with the S-sample, which became a gel in 3 h after preparing. The IP system showed good biocompatibility and long duration time of the gel state after subcutaneous implantation. These characteristics of D-samples, quick extemporaneous preparation and high stability in the sol state before injection, would be very convenient in a clinical setting.

Aqueous solutions of biodegradable polymers exhibiting sol-to-gel transitions in response to external stimuli such as temperature and pH are expected to be used as injectable polymers (IPs) for biomedical applications. In this study, we prepared novel biodegradable temperature-responsive IP systems providing variable gel-forming pH regions. We synthesized PCGA-b-PEG-b-PCGA (tri-PCG) and attached carboxylic acid or primary amine groups on both termini, tri-PCG-COOH and tri-PCG-NH 2 , and investigated the temperature-responsive sol-to-gel transition behavior of the mixtures of these two copolymers at various pHs. We found that the gel-forming pH region of the mixed system could be easily controlled by simply changing the mixing ratios of these polymers.