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.
Weekly Weather Report for Puerto Vallarta, Mexico. Looking at the weather in Puerto Vallarta, Mexico over the next 7 days, the maximum temperature will be 28â (or 83â) on Friday 14th April at around 3 pm. In the same week the minimum temperature will be 17â (or 63â) on Sunday 9th April at around 6 am.