This technique is mostly used in areas where water availability is limited or uncertain during crop establishment, as in rainfed areas.
"It was a very long and uncertain step from the establishment of X-ray crystallography to the application of it to large molecules," said Dr. Paul M. Doty, an emeritus professor of molecular biology at Harvard, who knew Dr. Perutz in Cambridge.
Mr. Obama's announcement, made during a nationally televised address to the Indian Parliament, came at the end of a three-day visit to India that won high marks from an Indian political establishment once uncertain of the president's commitment to the relationship.
In a radio interview he also criticised, in no uncertain terms, the Russian establishment's apparent readiness to quarrel with the West.
Uncertain rainfall in spring can make main crop establishment difficult, and heavy rains in July and August can damage crops and generate upland erosion.
Both have been used to predict the response of natural populations or plantations of forest trees to climate change, and to make recommendations about provenance selection for seed collection, breeding population establishment, and reforestation for uncertain future climates.
The mechanism responsible for recruiting PRC2, which is the complex responsible for the establishment of H3K27me3, remains uncertain, as no CpG binding component of PRC2 has yet been detected.
A recent survey (Clements, 1996; McDonald and Clements, 1999) found that of 21 possible constraints to the future use of tropical pasture plants, farmers rated uncertain commodity prices, high cost of establishment and costs of maintaining improved pastures among the top four.
The uncertain future of the games in this evolving establishment concerns Sunil, a thirteen-year-old boy who works at the airport.
