At low densities, the bacteria produced AHL, but none of the other three proteins. At higher densities, AHL began to accumulate within the cells, triggering a positive feedback loop that prompted the bacteria to produce more AHL and start making the other two proteins too. This made the bacteria glow, until enough of the "off switch" chemical accumulated to turn the system off. The result of this was bacteria that flickered, but each in its own rhythm.
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CD37 is also present, at low densities, on resting and activated t cells, neutrophils, monocytes, and some myelomonocytic leukemia cells.
CD 37同样也低密度的存在于静止或活化t细胞，中性粒细胞，单核细胞以及骨髓单核细胞性白血病细胞膜上。
At low densities, the influence of the TBF rearrangement on symmetry potential is rather small, and the TBF rearrangement effect becomes more and more pronounced as the density rises.
在低密度区域，三体核力重排贡献对同位旋对称势的影响相当小，然而随着密度的升高，三体核力重排效应的贡献显著增强。
Dr Yadvendradev Jhala of the Wildlife Institute of India, who led the study, said: "Tigers are cryptic, nocturnal and occur at low densities so they are extremely difficult to monitor.
负责这项研究的领头人，来自印度野生动物协会的Yadvendradev Jhala博士说：“老虎属夜行动物，行动隐秘，独来独往，所以很难监测它们。”
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