oxygen的示例

• Air is composed mainly of nitrogen and oxygen.

• Deep-sea divers carry cylinders of oxygen on their backs.

• Mountain climbers use oxygen when they reach higher altitudes.

• Plants are the main source of atmospheric oxygen.

• The symbol for oxygen is O2.

• Numerous substances are found in nature and in the body that function as protective agents against oxygen-free radicals.

• In each case, inversion of configuration was demonstrated using thio-substituted non-bridging phosphate oxygens.

• This effect allows oxygen to be released from the molecule at venous oxygen pressure.

• The results support a link between aerobic resistance and defective oxygen scavenging.

• Reproducibility of replicate analyses of standards was generally better than 0.1 for both carbon- and oxygen-isotope ratios.

• We note that since (2.20), the equation for oxygen tension, is quasi-steady, small jumps in the oxygen tension may appear between consecutive timesteps.

• However, we have observed that some exposure to atmospheric molecular oxygen may have limited, if any, effect on viability of certain methanogens.

• Thus, it appears that at least a few species of methanogens can tolerate atmospheric oxygen for relatively extended periods of time.

• Increased subaerial volcanism and the rise of atmospheric oxygen 2.5 billion years ago.

• It involves administering pure oxygen to the patient at greater than atmospheric pressure.

• In the normal fetus, the tension of arterial oxygen would be higher in the ascending aorta than in the pulmonary arteries and descending aorta.

• Although hopanoid biosynthesis does not require oxygen, these lipids have never been isolated from strictly anaerobic bacteria.

• Five days later, following extubation, the saturations were 86-88% in 50% facial oxygen.

• If demand for oxygen still exceeds supply once these adaptations have occurred, the fetus must further reduce its oxygen consumption.

• The present study was undertaken to investigate the effects of inspired oxygen and positive end-expiratory pressure on arterial blood gases and systemic delivery of oxygen.