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.
Average Weather in Puerto Vallarta Mexico. In Puerto Vallarta, the wet season is hot, oppressive, and overcast and the dry season is warm, muggy, and partly cloudy. Over the course of the year, the temperature typically varies from 62Â°F to 90Â°F and is rarely below 56Â°F or above 93Â°F.