C P Nielsen

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The expression of opioid genes was examined in isolated populations of glial cells in primary culture. Northern blot analysis of purified type I astrocytes, oligodendrocytes and mixed oligodendrocyte-type-2-astrocyte lineage cells derived from cerebral cortex demonstrated robust expression of proenkephalin mRNA exclusively in type I astrocytes. The(More)
Large intra-season differences in concentrations of CO and O 3 ([CO], [O 3 ]) were detected at Miyun, a rural site north of Beijing, in summer 2006. Despite an increase in mean daytime [CO] from 500 ppbv in June to 700 ppbv in July, mean daytime [O 3 ] dropped from 67 ppbv in June to 50 ppbv in July and August. The observed changes 5 in CO and O 3 are(More)
Although China has surpassed the United States as the world's largest carbon dioxide emitter, in situ measurements of atmospheric CO 2 have been sparse in China. This paper analyzes hourly CO 2 and its correlation with CO at Miyun, a rural site near Beijing, over a period of 51 months (Dec 2004 through Feb 2009). The CO 2-CO correlation analysis evaluated(More)
A sequence of 3 patches of high-density (10 12 m −3) cold plasma on a horizontal scale-size of 300– 700 km was observed near magnetic noon by the EISCAT VHF radar above Svalbard on 17 December 2001. The patches followed a trajectory towards the cusp inflow region. The combination of radar and all-sky observations demonstrates that the patches must have been(More)
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