The government has also arranged for Petrobras to be the primary operator of all pre-salt oil fields and to have a minimum 30 percent stake in all pre-salt joint ventures, an arrangement that is still competitive in relation to other major oil-producing states like Nigeria and Venezuela (and without the high militant and political risk).
Their research was complicated by the fact that of the five primary taste sensations salty, sweet, sour, bitter, and umami the taste of salt is the least understood.