| 1 | For example, can be butane or isobutane. | |
| 2 | The ratio of iso-to normal butane is high in immature sediments and decreases in mature sediments. | |
| 3 | Unscrupulous owners are placing gas or liquid into cows' udders to make them bigger. | |
| 4 | There is more methane, ethane, isobutane and isopentane in shaly limestone than in marlite. | |
| 5 | This paper elucidates the present situation of research and development of solid acid catalysts for the alkylation of isobutane with butene. |
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