Abstract
Virology![Figure][1] CREDIT: © BERYL PETERS COLLECTION/ALAMY The first woman on Earth, Pandora, had a “box,” or rather a jar, that Zeus commanded her to safeguard and never open. Of course she opened it, and thus evil spread around the world. Recently, an extraordinarily distinctive group of giant viruses that parasitize amoebas were described and named Pandoravirus, not because they contain all evil but merely because they are jar-shaped. Le gendre et al. have added to this still-tiny pantheon with another jar-shaped viral particle 1.5 µm long, containing a rather diminutive 600-kb AT-rich genome (as compared to the up to 2.8-Mb genome seen in Pandoraviruses) and a cytoplasmic replication machinery resembling that of the original Megaviridae. The authors named the virus Pithovirus because Pandora's jar was called a “pithos” in ancient Greek. This virus was revived from a Siberian permafrost sample and infects amoebas. Although named for the jar and not its contents, given its origins, this discovery hints that viruses more evil than Pithovirus might be revived as the tundra melts. Proc. Natl. Acad. Sci. U.S.A. 111 , 10.1073/pnas.1320670111 (2014). [1]: pending:yes
Highlights
The mass of the electron is one of the fundamental constants of nature
It is known to a high precision, but improvements are desirable in order to facilitate continued precision testing of the Standard Model of particle physics
By measuring the ratio of these two frequencies, one can determine the electron mass, knowing the mass of the ion and the g factor of the bound electron, which is different from its well-known free-space value; to estimate it, the authors used the theory of quantum electrodynamics and related measurements in a silicon system
Summary
The first woman on Earth, Pandora, had a “box,” or rather a jar, that Zeus commanded her to safeguard and never open She opened it, and evil spread around the world. The authors named the virus Pithovirus because Pandora’s jar was called a “pithos” in ancient Greek. This virus was revived from a Siberian permafrost sample and infects amoebas. Sturm et al use an indirect technique, in which an electron is bound to a carbon nucleus in a hydrogen-like configuration. This positively charged ion follows a circular orbit in an external magnetic field at the cyclotron frequency, which is proportional to the local magnetic field B.
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