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5:22
YouTube
The Organic Chemistry Tutor
Protein Structure - Primary, Secondary, Tertiary, & Quarternary - Biology
This biology video tutorial provides a basic introduction into the four levels of protein structure - primary, secondary, tertiary and quarternary structure. The primary structure of a protein is based on the sequence of amino acids. The secondary structure is based on localized shapes such as the alpha helix or the beta pleated sheet. The ...
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🔬 Spiegazione scientifica, cautele e limiti Quando si pota, la pianta non “guarisce” il taglio come un animale: lo isola. Le cellule del cambio e del floema formano un tessuto di chiusura chiamato callo cicatriziale, che sigilla la ferita e isola la parte morta dal legno sano. Un mastice cicatrizzante serve quindi solo quando la pianta non riesce da sola a proteggersi: – tagli di grosso diametro (oltre 3–4 cm) – specie sensibili (albicocco, ciliegio, betulla, acero) – periodi freddi o umidi, qu
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