简介:剑桥——闻名世界的大学城。WhenwesaythatCambridgeisauni-versitytownwedonotmeanthatitisatownwithauniversityinit.Auniversitytownisonewherethereisnoclearseparationbe-tweentheuniversitybuildingsandtherestofthecity.Theuniversityisnotjustonepartofthetown;itisalloverthetown.TheheartofCambridgehasitsshops,restaurants,marketplacesandsoon,butmostofitisuniversity,col-leges,libraries,clubsandotherplacesforuniversitystaffandstudents.Thetownwastherefi...
简介:TwonewcoenzymeB12analogues,2’,5’-dideoxycytidylcobalamin(2a)and2’,5’-dide-oxyuridinylcobalamin(2b),andtwoothers,2’,5’-dideoxyadenosylcobalamin(2c),and5’-deoxy-thymidylcobalamin(2d)werepreparedbyanimprovedmethod.AllthefouranalogueswereinvestigatedbyUV-visand2D1HNMRspectroscopy.Thecomparisonsanddiscussionabouttheirspectroscopicpropertiesweredone.