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The practice of palliative care is changing under the pandemic: Doctors and nurses are learning new ways to help patients and families communicate their treatment goals and make decisions about end-of-life care. Reza Estakhrian/Getty Images hide caption toggle caption Reza Estakhrian/Getty Images The practice of palliative care is changing under the pandemic: Doctors and nurses…

ACS Nano, showed that when a single layer of fabric was used, the filtration efficiency ranged from five to 80 percent and five to 90 percent depending on the size of the particles.However, when using multiple layers of fabrics, filtration efficiency significantly increased to more than 80 percent for smaller particles and more than 90…