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.
Puerto Vallarta Water Temperature. Puerto Vallarta is located on the Bay of Banderas along Jaliscoâs Pacific Coast, Mexico. In the early 16th century Spanish soldiers discovered the bayâs shores when seeking supplies. A shipyard was established in Puerto Vallarta when California was being colonised and the Old Town evokes that heritage.