Tufa - définition. Qu'est-ce que Tufa
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Qu'est-ce (qui) est Tufa - définition

INTERPRO FAMILY
Elongation factor thermo unstable; Elongation factor tu; TufA; GTP-binding elongation factor family, EF-Tu/EF-1A subfamily
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Tufa         
·- A friable volcanic rock or conglomerate, formed of consolidated cinders, or scoria.
II. Tufa ·- A soft or porous stone formed by depositions from water, usually calcareous;
- called also calcareous tufa.
tufa         
n.
Tuff, volcanic tufa.
tufa         
['t(j)u:f?]
¦ noun
1. a porous rock composed of calcium carbonate and formed by precipitation from water, e.g. around mineral springs.
2. another term for tuff.
Derivatives
tufaceous -'fe???s adjective
Origin
C18: from Ital., var. of tufo (see tuff).

Wikipédia

EF-Tu

EF-Tu (elongation factor thermo unstable) is a prokaryotic elongation factor responsible for catalyzing the binding of an aminoacyl-tRNA (aa-tRNA) to the ribosome. It is a G-protein, and facilitates the selection and binding of an aa-tRNA to the A-site of the ribosome. As a reflection of its crucial role in translation, EF-Tu is one of the most abundant and highly conserved proteins in prokaryotes. It is found in eukaryotic mitochondria as TUFM.

As a family of elongation factors, EF-Tu also includes its eukaryotic and archaeal homolog, the alpha subunit of eEF-1 (EF-1A).

Exemples du corpus de texte pour Tufa
1. Pointing to the new courthouse, built from pink tufa, the local stone, Sarkisyan says two three–storey schools once shared this corner of the town‘s main square.
2. The lines of tombs and niches are cut into the sides of winding galleries dug in soft tufa stone to create one of six known Jewish catacombs in Rome.
3. In the vast suburb to the northwest of Giumri, where the "carcasses" stand, he added a colony of four–storey blocks of pink tufa to rehouse several hundred families in high–quality flats.