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2. Sub-second periodicity in a fast radio burst.

Author

Andersen BC, Bandura K, Bhardwaj M, Boyle PJ, Brar C, Breitman D, Cassanelli T, Chatterjee S, Chawla P, Cliche JF, Cubranic D, Curtin AP, Deng M, Dobbs M, Dong FA, Fonseca E, Gaensler BM, Giri U, Good DC, Hill AS, Josephy A, Kaczmarek JF, Kader Z, Kania J, Kaspi VM, Leung C, Li DZ, Lin HH, Masui KW, Mckinven R, Mena-Parra J, Merryfield M, Meyers BW, Michilli D, Naidu A, Newburgh L, Ng C, Ordog A, Patel C, Pearlman AB, Pen UL, Petroff E, Pleunis Z, Rafiei-Ravandi M, Rahman M, Ransom S, Renard A, Sanghavi P, Scholz P, Shaw JR, Shin K, Siegel SR, Singh S, Smith K, Stairs I, Tan CM, Tendulkar SP, Vanderlinde K, Wiebe DV, Wulf D, and Zwaniga A

Abstract

Fast radio bursts (FRBs) are millisecond-duration flashes of radio waves that are visible at distances of billions of light years 1 . The nature of their progenitors and their emission mechanism remain open astrophysical questions 2 . Here we report the detection of the multicomponent FRB 20191221A and the identification of a periodic separation of 216.8(1) ms between its components, with a significance of 6.5σ. The long (roughly 3 s) duration and nine or more components forming the pulse profile make this source an outlier in the FRB population. Such short periodicity provides strong evidence for a neutron-star origin of the event. Moreover, our detection favours emission arising from the neutron-star magnetosphere 3,4 , as opposed to emission regions located further away from the star, as predicted by some models 5 ., (© 2022. The Author(s), under exclusive licence to Springer Nature Limited.)

Published
2022
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3. Lac repressor can be fused to beta-galactosidase.

Author

Müller-Hill B and Kania J

Subjects
Amino Acid Sequence, Bacterial Proteins analysis, Chromatography, Ion Exchange, DNA-Directed RNA Polymerases, Electrophoresis, Polyacrylamide Gel, Escherichia coli enzymology, Galactosidases biosynthesis, Genes, Genetic Code, Molecular Weight, Mutation, Phosphorus Radioisotopes, Protein Binding, Protein Biosynthesis, Recombination, Genetic, Bacterial Proteins metabolism, Escherichia coli metabolism, Galactosidases metabolism, Genes, Regulator, Lactose metabolism, Operon
Published
1974
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