Pratica di ascolto TOEFL – Scientific American – Composto d'aglio



Scientifico americano è un'incredibile risorsa online gratuita per esercitare le tue capacità di ascolto e lettura del TOEFL.

Scienza in 60 secondi fornisce resoconti e commenti rapidi sul mondo della scienza e richiede solo un minuto.


Cose da fare

  1. Ascolta la registrazione quante volte vuoi senza fare riferimento alla trascrizione.
  2. Con parole tue, descrivi l'argomento principale della registrazione in una o due frasi.
  3. Annota almeno tre dettagli o statistiche menzionati nella registrazione. Dovrebbero essere frasi con parole tue.
  4. Leggi attentamente la trascrizione e aggiungi nuove parole al tuo vocabolario.
  5. Controlla le tue risposte.
  6. Ascolta di nuovo la registrazione.
Trascrizione

Garlic Compound Fights Food-Borne Bacteria

This is Scientific American 60-Second Science. I’m Sophie Bushwick. Got a minute?

It’s more bad news for vampires, but good news for the fight against food-borne illness: a compound in garlic is extremely effective at fighting Campylobacter, bacteria that frequently cause intestinal infections. The work is in the Journal of Antimicrobial Chemotherapy.

Campylobacter causes problems in part because its cells produce a slime that holds them together in a biofilm. This biofilm sticks to food and food preparation surfaces, helping contamination spread. And it protects the bacteria from antibiotics.

Researchers tried treating Campylobacter jejuni with two common antibiotics, as well as with diallyl sulfide, the compound derived from garlic.

The antibiotics did some damage. But the garlic compound worked faster and was a hundred times as effective. It quickly infiltrated the biofilm, and killed the bacteria, apparently by inhibiting the functions of enzymes.

Eating garlic won’t slay Campylobacter. But diallyl sulfide could one day be used to clean surfaces used for food preparation, and to stop bacteria from colonizing packaged foods, like salads and deli meats. Which may annoy any vampires getting by on rare roast beef.



Seguimi su Facebook per ulteriori risorse e aggiornamenti!