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.
The wettest month in Puerto Vallarta is August with 304.5cm of rain and the most days of rain with 19.5 days with some rain, a very wet time to visit the beach. The driest month in Puerto Vallarta is April with 0.2cm of rain and the least days of rain with 0.1 days with some rain, an extremely dry time to visit the beach.