过去给水族馆的水过滤和充氧的尝试都已失败了。
Previous attempts at filtering and oxygenating aquarium water had failed.
大肠菌群是指需氧和兼性厌氧的革兰氏阴性无芽孢杆菌。
The coliform group referred to the aerobic or facultative anaerobic gram-negative budless bacillus.
随着感染时间的不断延长，活性氧的产生速率逐渐降低，同时光合作用逐渐减弱。
With lastingness of infection, the productive rate of reactive oxygen species decreased gradually, and photosynthesis also weakened.
这颗小行星将需要具备水使殖民者可以提取氢和氧的火箭燃料。
The asteroid would need to posses water so that colonists could extract oxygen and hydrogen for rocket fuel.
这种依靠人工的将水分离成氢和氧的过程也是需要消耗能量的。
Instead it has to be manufactured by splitting water into hydrogen and oxygen, a process that consumes energy.
紫外线增加了活性氧的水平，但这也是损害皮肤细胞的有害分子。
UV rays increase the levels of reactive oxygen species - harmful molecules which damage the cells - in the skin.
这个特征就是氧的同位素，它是由氧原子和不同数量的中子组成的。
That water signature is in the form of oxygen isotopes, atoms of oxygen with different Numbers of neutrons.
贫血是机体红细胞减少，不能对组织器官充分供氧的一种病理状态。
Anemia is a condition in which you don't have enough healthy red blood cells to carry adequate oxygen to your tissues.
该组研究人员测量了五头黑猩猩和四个人在跑步机上行走时氧的消耗量。
The group measured the oxygen burned by five chimpanzees and four people as they walked on a treadmill.
通过查周期表可以看到它就在氧的正下方，因此它们两个都有六个价电子。
By looking at the periodic table it's right underneath oxygen, so those both have 6 valence electrons.
倒置体式能清理上呼吸道，排出鼻腔内的分泌物，让新鲜富氧的血液循环到口腔。
Inversions can help clear the upper respiratory tract and drain secretions from the nose, allowing freshly oxygenated blood to flow into the oral cavity.
首先，他们考虑了有毒的或者无氧的底部水流的季节性上升造成这种灾难的可能性。
First, they considered the possibility that seasonal upwellings of toxic or oxygen-poor bottom water were responsible.
那么，在这种情况下，我们看到氮的形式电荷是负的，而在这种情况下，氧的是负的。
So, in this case, we see that our formal charge is negative on the nitrogen, in this case it's negative on oxygen.
从甲酸盐中获取所需的能量是目前最简单的维持生命方式，虽然它依赖于无氧的环境。
Getting useful energy from formate is now the simplest way known for any life form to get its fuel, though it relies on the absence of oxygen.
另外，久而久之，定期的运动将使你的血管更有效率、更灵活地更传送更多富氧的血液。
In addition, over time, regular exercise will make your blood vessels become more flexible allowing them to deliver more oxygen rich blood more efficiently.
在24亿年前和60000万前年大气中氧的水平的变化方面，他们有一个特殊的兴趣。
They have a particular interest in the jumps in the level of atmospheric oxygen seen about 2.4 billion years ago and 600m years ago.
这两属都是杆状菌。一属(芽孢杆菌属)是需氧的，另一属(梭状芽孢杆菌属)是厌氧的。
Both genera are rod forms, one (Bacillus) is aerobic and the other (Clostridium) is anaerobic.
亚利桑那大学也在研究沙漠植物变化的水文效应、碳氧的雨林动态和可变气候环境中的植物。
The University of Arizona is also studying the hydrological effects of desert vegetation changes, and the rainforest dynamics of carbon, oxygen and vegetation in a variable-climate setting.
这可能是因为一个缺乏氧的胚胎会首先把充氧的血液输送到脑部，然后才送到身体的其他部位。
This is probably because a fetus starved of oxygen will send oxygenated blood to the brain in preference to rest of the body.
贫血是机体红细胞减少，不能对组织器官充分供氧的一种病理状态。此时常常会有精疲力竭的感觉。
Anemia is a condition in which you don't have enough healthy red blood cells to carry adequate oxygen to your tissues. Having anemia may make you feel exhausted.
这项技术很有效，因为当水从海里蒸发，氢和氧的同位素组合升空形成云，接着飘至陆地上空降雨。
The technique works because when water evaporates at sea, a combination of hydrogen and oxygen isotopes rise to form a cloud, which then releases rain when it moves inland.
德尔曼写道：“在一个充满了氢与氧的干渴世界，终于有人发现了合成水分子(H2O)的方法。”
"In a thirsty world filled with hydrogen and oxygen," Mr Derman has written, "someone had finally worked out how to synthesise H2O."
这项技术的确有效，因为当水从海中蒸发后，氢和氧的同位素升起形成云，接着当它飘至陆地上空时再变为雨。
The technique worksbecause when water evaporates at sea, a combination of hydrogen and oxygenisotopes rise to form a cloud, which then releases rain when it moves inland.
当海洋变暖时，海水表面会形成更稳定的薄层，薄层会影响水面上营养物质的有效性，更让人焦虑的是，会影响到氧的使用。
Surface waters are expected to form more stable layers as the oceans warm, which will affect the availability of nutrients and, it is increasingly feared, of oxygen.
在最近的一项与此项目无关的昆虫体型实验种，科学家发现富氧的环境支持更大的昆虫身体，所以这个可能也是大型哺乳动物的原因。
In an unrelated recent experiment with insect body sizes, scientists discovered that a more oxygen-rich atmosphere supports super-giant insects, so this could be the case with giant mammals too.
因此，我们也许会感到意外，维生素c这个广为人知的抗氧化剂竟有“助氧化剂(Pro - oxidant)”一面，它可以通过增加活性氧的生成让动脉受惠。
It might therefore come as a surprise to learn that vitamin c, a well-known antioxidant, has a "pro-oxidant" alter ego that can benefit arteries by increasing the production of ROS.
因此，我们也许会感到意外，维生素c这个广为人知的抗氧化剂竟有“助氧化剂(Pro - oxidant)”一面，它可以通过增加活性氧的生成让动脉受惠。
It might therefore come as a surprise to learn that vitamin c, a well-known antioxidant, has a "pro-oxidant" alter ego that can benefit arteries by increasing the production of ROS.
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