Adult Laryngotracheobronchitis in the Setting of a COVID-19 Infection.

We describe a case of adult croup in an 18-year-old female caused by the SARS-CoV-2 virus. Her complaints started as lower respiratory tract symptoms that evolved into stridor, barking cough, and dyspnea. The patient was diagnosed with SARS-CoV-2 by reverse transcription-polymerase chain reaction (RT-PCR) testing from a nasopharyngeal swab.

Production of recombinant choline oxidase and its application in betaine production.

Unlabelled: Choline oxidase catalyzes the oxidation of choline to glycine betaine via betaine aldehyde in glycine betaine biosynthesis and betaine acts as an osmolyte. Choline oxidase has attracted a great deal of attention because of its wide application in clinical and its potential use in enzymatic betaine production. Therefore, the development of efficient methods for overexpression of choline oxidase will be very valuable.