Algue fossile vaccination contre le Covid et le hibou de Washington lactu des sciences en ultrabrves

L'actualit? scientifique du 17 janvier 2022, c'est :

Arch?o : Cette algue d'un milliard d'ann?es est le plus vieux fossile ? porter des marques de photosynth?se

  • Cette d?couverte constitue la premi?re preuve in situ de restes de chlorophylle chez un organisme multicellulaire.
  • Elle a ?t? faite en RDC, sous la forme de compressions carbon?es dans des schistes du bassin du Congo.
  • Il s'agit d'un fossile d'une algue eucaryote : cet organisme form? de cellules dot?es de noyaux est vieux d'environ 1,2 milliard d'ann?es.

    • Sant? : Covid-19 : la protection des vaccins est plus durable qu'on ne le pensait

  • La baisse rapide d'anticorps observ?e six mois apr?s l'injection d'un vaccin ? ARN et la moindre protection contre l'infection constat?e ? l'issue de cette p?riode faisaient craindre que l'efficacit? des vaccins devenait rapidement insuffisante.
  • Une nouvelle ?tude montre d?sormais que malgr? cette baisse du niveau d'anticorps, nous demeurons tr?s bien prot?g?s contre les formes graves du coronavirus pendant au moins neuf mois.
  • Il semble que les lymphocytes T, des cellules immunitaires, restent mobilis?es longtemps apr?s la vaccination et nous prot?gent aussi du variant Omicron.

    • Animaux : A Washington, on se passionne pour un hibou venu de l'Arctique

  • Un harfang des neiges, rapace venu de l'Arctique, a ?lu domicile ? Washington, la capitale des Etats-Unis.
  • Sa pr?sence a ?t? signal?e par le r?seau eBird, agr?geant 290.000 ornithologues amateurs.
  • Le harfang des neiges niche l'?t? dans les zones arctiques du cercle polaire et la plupart des individus migrent vers le sud pour passer l'hiver.

    • Espace : An?mie spatiale : les cons?quences des voyages dans l'espace sur les globules rouges des astronautes

  • Une nouvelle ?tude permet de mieux comprendre l'an?mie provoqu?e par les voyages dans l'espace.
  • L'an?mie, qui se caract?rise par un taux anormalement bas d'h?moglobine dans le sang, se traduit par diff?rents sympt?mes : fatigue, faiblesse g?n?rale, vertiges et un essoufflement fr?quent. 
  • Selon cette ?tude, l'an?mie spatiale pourrait avoir un impact significatif sur les missions spatiales de longue dur?e, l'an?mie augmentant avec le temps pass? dans l'espace.

    • Sant? : En Chine, les cas quotidiens au plus haut depuis deux ans ? trois semaines des JO

  • Le nombre de cas de Covid-19 en Chine a atteint lundi 17 janvier 2022 son plus haut niveau depuis mars 2020.
  • A moins de trois semaines des JO d'hiver de P?kin (4-20 f?vrier), les autorit?s sont sur le qui-vive.
  • Une responsable de la sant? de P?kin a indiqu? ? la presse que le virus avait ?t? trouv? sur une lettre re?ue du Canada par la personne contamin?e.

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