30 Matching Annotations
  1. Jan 2021
    1. The "RNA World" hypothesis posits that the first replicators were RNA-based, and that DNA arose only later as a product of RNA life forms.

      RNA -} DNA

    2. The finding is the latest in a series of discoveries, over the past several years, pointing to the possibility that DNA and its close chemical cousin RNA arose together as products of similar chemical reactions, and that the first self-replicating molecules—the first life forms on Earth—were mixes of the two.

      early molecules

  2. Dec 2020
    1. Transfection commonly refers to the introduction of nucleic acids into eukaryotic cells, or more specifically, into animal cells. Classically, the term transfection was used to denote the uptake of viral nucleic acid from a prokaryote‑infecting virus or bacteriophage, resulting in an infection and the production of mature virus particles. However, the term has acquired its present meaning to include any artificial introduction of foreign nucleic acid into a cell.

      Artificially introducing RNA into cells by means other than a virus or bacteriophage.

  3. Nov 2020
    1. reading fram

      The reading frame is the way of dividing each sequence of nucleotides in the DNA or RNA molecule into a set of consecutive, non-overlapping triplets.

  4. Oct 2020
  5. Sep 2020
    1. Peccia, J., Zulli, A., Brackney, D. E., Grubaugh, N. D., Kaplan, E. H., Casanovas-Massana, A., Ko, A. I., Malik, A. A., Wang, D., Wang, M., Weinberger, D. M., & Omer, S. B. (2020). SARS-CoV-2 RNA concentrations in primary municipal sewage sludge as a leading indicator of COVID-19 outbreak dynamics. MedRxiv, 2020.05.19.20105999. https://doi.org/10.1101/2020.05.19.20105999

  6. Aug 2020
  7. Jul 2020
    1. Mulligan, M. J., Lyke, K. E., Kitchin, N., Absalon, J., Gurtman, A., Lockhart, S. P., Neuzil, K., Raabe, V., Bailey, R., Swanson, K. A., Li, P., Koury, K., Kalina, W., Cooper, D., Fonter-Garfias, C., Shi, P.-Y., Tuereci, O., Tompkins, K. R., Walsh, E. E., … Jansen, K. U. (2020). Phase 1/2 Study to Describe the Safety and Immunogenicity of a COVID-19 RNA Vaccine Candidate (BNT162b1) in Adults 18 to 55 Years of Age: Interim Report. MedRxiv, 2020.06.30.20142570. https://doi.org/10.1101/2020.06.30.20142570

    1. That does not mean that there is infectious virus present. (This distinction has confused a great number of reports about the persistence of the virus on surfaces as well). We still don’t know how long infected patients (symptomatic and asymptomatic) are shedding infectious virus – those are far harder data points to obtain than just detecting viral RNA.
  8. May 2020
  9. Apr 2020
  10. Oct 2019
    1. We have demonstrated that small RNAs can tightly repress their target genes when their synthesis rate is smaller than some threshold, but have little or no effect when the synthesis rate is much larger than that threshold
    2. a threshold-linear response with a tunable threshold, a robust noise resistance characteristic, and a built-in capability for hierarchical cross-talk.
    1. In particular, small RNAs are shown to establish a threshold for the expression of their target, providing safety mechanism against random fluctuations and transient signals. The threshold level is set by the transcription rate of the small RNA and can thus be modulated dynamically to reflect changing environmental conditions.
  11. Oct 2018
  12. Sep 2018
  13. Jun 2018
    1. Dnmt2 mediates intergenerational transmission of paternally acquired metabolic disorders through sperm small non-coding RNAs

      Queuosine metabolite necessary for DNMT2-induced tRNA modification; salvaged from bacteria of microbiome

  14. Mar 2018
  15. Feb 2018
  16. Nov 2017
  17. Oct 2017
  18. Nov 2016
    1. Two new molecular catalysts of water oxidation have been synthesized by a team of brilliant scientists from the U.S. Department of Energy’s Brookhaven National Laboratory. These new molecular catalysts – complexes of ruthenium which are surrounded by the binding molecules, and they contain phosphonate groups.