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.
January brings hot, mostly sunny weather with the odd cloudburst and warm relatively calm seas. This is high season in the Galapagos Islands. February 's air and sea temperatures are high, seas are calm. Short, heavy rain showers on otherwise sunny days. March has hot, humid, sunny weather between cloudbursts. Warm, calm seas make for pleasant Galapagos cruising. April sees hot sunny days interrupted by heavy but short showers of rain.