Betekenis van:
virulent

Voorbeeldzinnen

1. HPAI in turkeys is similar to that seen in domestic fowl, but some HPAI viruses appear more virulent in turkeys while others appear less virulent.
2. On the general nutrient media, virulent isolates of R. solanacearum develop pearly cream-white, flat, irregular and fluidal colonies often with characteristic whorls in the centre.
3. The results of the surveys carried out in the Member States have proven to be very useful in monitoring the presence of avian influenza virus subtypes that could present a substantial risk if they mutated into a more virulent form.
4. As positive controls, prepare decimal dilutions from a suspension of 106 cfu per ml of a virulent biovar 2 strain of R. solanacearum (e.g. NCPPB 4156 = PD 2762 = CFBP 3857).
5. Produce a 48 hour culture of a virulent strain of R. solanacearum race3/biovar2 (e.g. strain NCPPB 4156 = PD 2762 = CFBP 3857) on basal SMSA medium and suspend in 10 mM phosphate buffer to obtain a cell density of approximately 2 × 108 cfu per ml. This is usually obtained by a faintly turbid suspension equivalent to an optical density of 0,15 at 600 nm.
6. Produce a 48 hour culture of a virulent strain of R. solanacearum race3/biovar2 (e.g. strain NCPPB 4156 = PD 2762 = CFBP 3857) on basal SMSA medium and suspend in 10 mM phosphate buffer to obtain a cell density of approximately 2 × 108 cfu per ml.