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.
This doesnât mean that you canât enjoy the coast, and with the sea temperatures languishing at a very warm 29Â°C, youâll want to get into the water and explore! September may well be the wettest month in Puerto Vallarta, but it still has plenty of sunshine and soaring temperatures for visitors to enjoy.