Quantum dots (QDs) are semiconductor materials that have gained great interest due to their unique characteristics like optical properties. They are extensively being used in different areas, including solar cells, light-emitting diodes, laser technology, as well as biological and biomedical applications. In this review, comprehensive information about different aspects of QDs is provided, including their types and classifications, synthesis approaches, in vitro and in vivo toxicity, biological applications, and potentials in clinical applications. With a focus on the biological aspects, the respective in vitro and in vivo studies are collected and presented. Various surface modifications on QDs are discussed as directly influencing their properties like toxicity and optical abilities. Given the promising results, these materials are clinically used for targeted molecular therapy and imaging. However, there are a large number of questions that should be addressed before the wide application of QDs in a clinical setting. Regarding the existing barriers to QDs, suggestions are given and discussed to present an appropriate route for the clinical use of these materials.

The use of different biomaterials with the ability to accelerate the repair and regeneration processes is of great importance in tissue engineering strategies. On this point, cerium oxide nanoparticles (CNPs or nanoceria) have recently attracted much attention due to their excellent biological properties including anti-oxidant, anti-inflammation and antibacterial activities as well as high angiogenic potential. The results of incorporation of these nano-sized particles into various constructs and scaffolds designed for tissue engineering applications have proven the success of this strategy in terms of improving healing process of different tissues. In this review, we first summarize the physicochemical and biological properties of nanoceria in brief and then present its usability in tissue engineering strategies based on the currently available published reports.

Background The spread of COVID‐19 as an infectious disease brings about many newly arrived challenges, which call for further research on the scope of its effect on life due to the special conditions of this disease. The present study is, therefore, an attempt to understand the lived experience of inpatients hospitalized with COVID‐19. Method In this phenomenological study, among patients with COVID‐19 who were hospitalized in COVID‐19 referral hospitals, 17 people were selected by random sampling method. Data were gathered by interviews and analysed using MAXQDA10 software. Findings Analysis revealed 4 main themes and 16 subthemes. Main themes included the (1) denial of the disease, (2) negative emotions upon arrival, (3) perception of social and psychological supports and (4) post‐discharge concerns and problems. Conclusion Patients with COVID‐19 experience a different world of stresses, concerns and feelings in the course of their disease. Gaining a deeper insight into patients’ experiences with this disease can help handle this disease more effectively and provide better post‐corona nursing and psychological care and services.

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