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 Weather. Puerto Vallarta sits on the Costa Dorada of Mexico, at the mid-point of Banderas Bay, where the Pacific Ocean washes the border between Jalisco and Nayarit. Pto. Located on the same latitude as the Hawaiian Islands (20ÂºN), the city's weather and climate are often compared to Hawaii's (City information).