The use of restriction enzymes as a tool for recombining, or joining, different DNA fragments was first illustrated in yet another classic paper, this time by Stanford University researchers Janet Mertz and Ronald Davis (Mertz & Davis, 1972).
Averages for Puerto Vallarta in February. The temperatures are still very warm in Puerto Vallarta, Mexico, in February, even though itâs still winter. Thanks to the cityâs location close to the equator, it enjoys good weather all year round providing the perfect place to head for a winter beach break â it certainly beats the cold European winter.
Nuevo Vallarta Weather. Nuevo Vallarta Weather and When to Go. Nuevo Vallarta weather essentials. When deciding what time of year to travel to Nuevo Vallarta, thereâs a trade-off between prices and weather. The weather is nicest in winter, which lasts from October to May, but this is tourist season and prices tend to rise accordingly.