Discover and read the best of Twitter Threads about #Panspermia
Most recents (2)
Hoy os vamos a contar un episodio crítico que ocurrió en nuestro planeta que lo cambió todo: la vida, el océano, la atmósfera, el aspecto del planeta entero.
Abrimos 🧵
Abrimos 🧵
Hace 4.500 millones de años, nuestro planeta era una masa incandescente cuya superficie iba poco a poco enfriándose.
No es hasta hace unos 3.800 Ma, cuando distintos elementos químicos en el primitivo océano se combinaron para formar las primeras moléculas orgánicas simples. En este momento la atmósfera estaba compuesta por CO2, N2, metano, amoniaco y sulfuro de hidrógeno.
Ribose, ribosomes, ribonucleic acid (RNA): none of them have anything to do with ribs. #HematologyTweetstory 20 is about the curious origin of those names, as the world grapples with a dangerous self-replicating #RNA virus. (RNA Image: @ScienceMagazine )/1
Our story begins thousands of years ago, in the ancient Middle East & North Africa. There was a particular tree - the acacia (Acacia seyal & Acacia senegal) - that exuded a sap that, when hardened, was highly treasured as a binder & gum. (Dripping branch image: Ashwin Baindur.)/2
Since much of the gum from the acacia tree found its way to Europe from Arab-controlled ports, it became known as “gum Arabic” (or “gum sudani”) in Europe. It is still commercially valuable today, but before the modern era it was hugely important, especially in medicines./3
