Accumulation in Dasuopu ice core in Qinghai-Tibet Plateau and solar activity
摘要:
The time series of accumulation in recent 300 years correlated well with solar activity in Dasuopu ice core. Results of spectrum analysis on the accumulation time series of the Dasuopu ice core shows that there are some periods that coincide with the periods of solar activity. By comparing the long-time change trend of the accumulation in the Dasuopu ice core with various kinds of indexes of solar activity intensity, a negative correlation is found between the trend and solar activity.
Facile Installation of a Hydroxyalkyl Group into Hydroxyanthraquinones and Aminoanthraquinones through the Modified Marschalk Reaction
作者:Li-Ming Zhao、Feng-Yan Ma、Hai-Shan Jin、Jiao Ma、Huan Wang、Chuan-Zhao Fu
DOI:10.1002/ejoc.201300891
日期:2013.11
skeleton through a simple yet efficient transformation, which could be potentially useful for the drug discovery process. We describe herein a simple and efficient method to derivatize 1,4-dihydroxyanthraquinone by using a modifiedMarschalkreaction. This method provides a clear advantage over traditional approaches, which often require the protection and deprotection of the OH groups. We also demonstrate