Word: oxygenate
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...basis for a complex marine food chain was in place 1.5 billion years ago, yet for some reason never got past the square marked GO. Why not? The hypothesis Knoll favors invokes the competition between two classes of compounds for control of the biochemical environment, one based on oxygen and the other on sulfide. During most of the Proterozoic, it turns out, only the shallows were infused with oxygen. The deep oceans, by contrast, were inordinately rich in sulfides, which indirectly interfere with the ability of algae to make use of growth-promoting nitrogen...
Just before the Cambrian, however, something big happened. The deep oceans were made oxygen rich and sulfide poor, Knoll believes, when an unusual spate of undersea landslides (triggered by the breakup of a primordial supercontinent) buried megatons of oxygen-consuming debris. Virtually simultaneously, microscopic algae spread far and wide. For the first time since the planet's formation 4 billion years earlier, the oceans were capable of supporting a population of small-, medium- and large-bodied animals...
...lose a bulldog." Leila, who died before her fifth birthday, is a case in point. Her London owner, Ken Mollett, was not surprised. Even undemanding walks had been too much for Leila and on hot days she would collapse, panting, her tongue blue from lack of oxygen. "Leila led a sad, feeble life," says Mollett, who has tried to breed old-fashioned bulldogs but has failed to win their acceptance at the Kennel Club. The club feels it has taken due action by modifying the standard head requirement from as big as possible to merely large. Sadly, some judges have...
...time the chopper landed at the hospital, Jessie had gone without blood--and thus oxygen--for 30 min. The medics put him on a gurney and took him down in an elevator four floors to Trauma Room 9, continuing CPR all the way. As doctors, nurses, aides and technicians hunched over the lifeless boy, nurse Dawn Colbert inserted an IV into his arm and began a rapid infusion of O-negative blood, the universal-donor type. Within 15 minutes, Colbert pumped nearly 1.5 liters of warmed blood into Jessie, about half the normal volume for an 80-lb. boy. Jessie...
...Clinic staff at Narita International Airport gave her oxygen and rushed her to the nearby Red Cross Hospital. There Dr. Hiroshi Morio immediately diagnosed a pulmonary embolism: a blood clot that had lodged in her lungs, possibly as a result of deep vein thrombosis (DVT), a condition often prompted by prolonged periods of immobility. "It was easy to diagnose," says Morio. "She was in a critical condition." For seven days Ishii's family kept a bedside vigil, and she was eventually discharged after three weeks. Eight months later, the 57-year-old still takes daily doses of anticoagulants. Ishii knew...