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A new and facile method based on an intermolecular cycloaddition was described for the synthesis of wedel-olactone deriv......
A new triterpenoid has been isolated from the leaves and stems of Fritillaria hupehensis Hsiao et K.C.Hsia.Its structure......
For the production of longer-lived isotopes of neutron-rich heavier actinide and transactinide elements,hot fusion react......
In this paper the reaction of substituted β-nitrostyrene with O,O-dialkyl phosphite under cocatalysis of trimethylsily......
目的 研究交感神经对犬快速右心房起搏所诱发的心房颤动(房颤)中的作用.方法 选择杂种犬28只,随机分为4组:交感刺激组、交感离断组......
目的:比较舌下含服硝酸甘油与静脉泵入异丙肾上腺素直立倾斜试验诊断血管迷走性晕厥的价值。方法:回顾性分析我院行直立倾斜试验的......
采用沉淀——浸渍法制备了固体超强酸SO4^2-／Al2O3并将其作为催化剂代替浓硫酸以异丙醇和水杨酸为原料合成水杨酸异丙酯．研究了不同......
合成了MCM-22分子筛,利用T-D-R法计算了二异丙苯三种异构体的热力学性质,对二异丙苯烷基转移反应的热力学进行了分析.讨论了反应温......
在流体并流向上的气液固三相固定床反应器中考察了多种硫化物对负载Pd催化剂上异二戊烯加氢反应活性的影响. 结果表明,在低温(60 ......
While large quantities of latex can be handled either by standard extraction techniques such as Soxhlet extraction or ac......
16~19℃水温下,采用静水式生物毒性试验法,研究了环氧丙烷、丙烯酸和异戊二烯对体质量（1.30±0.62）g的仿刺参幼参的急性毒性。研......
采用L-S浸没沉淀相转化法制备纳米纤维素（NCC）／聚砜（PSF）复合膜材料。考察了NCC添加量及异丙醇凝胶浴浓度（10％、30％、50％，体积分数，下同）对膜结......
目的探讨4例依赖异丙肾上腺素逆传的房室折返性心动过速的发作情况及电生理特点.方法对4例射频导管消融前常规电生理检查未能诱发......
