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Conventional synthetic vascular grafts are associated with significant failure rates due to their mismatched mechanical properties with the native vessel and poor regenerative potential. Though different tissue engineering approaches have been used to improve the biocompatibility of synthetic vascular grafts, it is still crucial to develop a new generation of synthetic grafts that can match the dynamics of native vessel and direct the host response to achieve robust vascular regeneration. The size of pores within implanted biomaterials has shown significant effects on macrophage polarization, which has been further confirmed as necessary for efficient vascular formation and remodeling. Here, we developed biodegradable, autoclavable synthetic vascular grafts from a new polyurethane elastomer and tailored the grafts' interconnected pore sizes to promote macrophage populations with a pro-regenerative phenotype and improve vascular regeneration and patency rate. The synthetic vascular grafts showed similar mechanical properties to native blood vessels, encouraged macrophage populations with varying M2 to M1 phenotypic expression, and maintained patency and vascular regeneration in a one-month rat carotid interposition model and in a four-month rat aortic interposition model. This innovative bioactive synthetic vascular graft holds promise to treat clinical vascular diseases.

Across the globe signage which conveys directives regarding appropriate behavior in public, such as 'Do Not Enter' signs, is made multilingual in ways that other signage is not. This paper examines two examples of multilingualism in directive signs within Seoul, South Korea in order to theorize what gives rise to multilingualism in directive signage while other signage remains monolingual. Examination of Vietnamese and Arabic on signs prohibiting the illegal disposal of household garbage on side streets in Seoul, and English, Chinese, and Japanese on mask-required due to COVID-19 signs within the Seoul subway system allows for a robust analysis of what shapes the inclusion of additional languages on directive signage. We posit the construction of a differently speaking other who is seen as likely to disobey stated regulations alongside the desire by authorities to minimize the effort required to respond to rule breaking results in a multilingual commanding urgency that shapes multilingualism in directive signage. The concept of multilingual commanding urgency emphasizes the role enforcement practices have in shaping multilingualism, an important development in understanding this form of signage. Multilingual commanding urgency is especially relevant as it shapes signage deployed in emergency contexts such as the COVID-19 pandemic.

Anti reflection coating with high hardness on the OLED display surface was studied to improve the wear resistance and visibility of OLED. However, the high residual stress inside the multilayer thin film configuration of anti reflection coating has been a problem and the improvement is necessary. In this study, the residual stress and optical properties variation on various deposition conditions on the thin film were investigated. In addition, we suggested new coating structure using nanocomposites to overcome the residual stress of films. [ABSTRACT FROM AUTHOR]

The visualization of accurate colour information using quantum dots has been explored for decades, and commercial products employing environmentally friendly materials are currently available as backlights.sup.1. However, next-generation electroluminescent displays based on quantum dots require the development of an efficient and stable cadmium-free blue-light-emitting device, which has remained a challenge because of the inferior photophysical properties of blue-light-emitting materials.sup.2,3. Here we present the synthesis of ZnSe-based blue-light-emitting quantum dots with a quantum yield of unity. We found that hydrofluoric acid and zinc chloride additives are effective at enhancing luminescence efficiency by eliminating stacking faults in the ZnSe crystalline structure. In addition, chloride passivation through liquid or solid ligand exchange leads to slow radiative recombination, high thermal stability and efficient charge-transport properties. We constructed double quantum dot emitting layers with gradient chloride content in a light-emitting diode to facilitate hole transport, and the resulting device showed an efficiency at the theoretical limit, high brightness and long operational lifetime. We anticipate that our efficient and stable blue quantum dot light-emitting devices can facilitate the development of electroluminescent full-colour displays using quantum dots. Cadmium-free blue quantum dot light-emitting diodes are constructed with a quantum yield of unity, an efficiency at the theoretical limit, high brightness and long operational lifetime., Author(s): Taehyung Kim [sup.1] , Kwang-Hee Kim [sup.1] , Sungwoo Kim [sup.1] , Seon-Myeong Choi [sup.1] , Hyosook Jang [sup.1] , Hong-Kyu Seo [sup.1] , Heejae Lee [sup.1] , Dae-Young [...]