The researches show that the content of resin and the relative molecular mass of maltene decrease as the reaction progress.

研究表明，随着反应的进行，树脂含量和相对分子质量降低。

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Nanotubes are actually quite nifty in principle - molecular strands of carbon molecules arranged in hexagonal configurations that are made up of much more empty space than mass.

碳纳米管实际上在理论上相当完美——六角形配置排列的碳分子，由碳原子和比其重得多得多的空间组成。

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The region of the atmosphere below90km has a nearly constant mean molecular mass and is therefore called the homo sphere.

90公里以下大气区域，具有一个接近恒定的平均分子质量，因此称为均匀层。

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The most likely alternatives, butter and pig fat, were ruled out using a technique called isotope-ratio mass spectrometry, which measures the molecular weights of the chemicals in a sample.

ECONOMIST: The Romans, too, had sophisticated cosmetics

Genzyme Molecular Oncology, a division of Genzyme General, of Cambridge, Mass.

FORBES: In search of antigens

"This is the first evidence that myostatin regulates muscle mass in people as it does in other animals, " said Dr Se-Jin Lee, professor of molecular biology and genetics at Johns Hopkins University and one of those involved in the study.

BBC: Myostatin controls the growth of muscles