California restricts COVID-19 testing as cases increase

California is changing its coronavirus testing strategy after it broke its own record on Wednesday for new COVID-19 infections, reporting a staggering 11,126 confirmed cases. The testing strategy will again focus on vulnerable patients and those most at risk of contracting the virus, which has infected more than 3 million …

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Simple self-assembled molecules on the links of a nanoscale chain

Complex molecular architectures are generally built by gradually connecting a variety of building blocks. But sometimes, complex structures arise from single-component self-assembly. Writing in NatureDatta et al.one Show how polycathenes, chains made of interlocking rings at the nanometer scale, can be formed by the remarkable self-assembly of a simple molecular …

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