According to the thin layer chromatography (General 0502) test, absorb the above two solutions 10u1, respectively, on the same silica gel GF254 thin layer plate, with dichloromethane-methanol (19:0.5) as the developing solvent, open, dry, and set the UV light (254nm) to view. The ...
SCIENTIFIC BOOKSdoi:10.1126/science.97.2516.263NoneAmerican Association for the Advancement of ScienceScience
THE LITTLE ICE AGEThe poem "The Little Ice Age," by Chana Bloch is presented. First Line: Europe shivered for centuries in the Little Ice Age. Last Line: the tree rings huddled against the cold.Field (00150657)