以二氧化硅负载高氯酸(HClO4-SiO2)为催化剂,醛与酰胺发生缩合反应得到了一系列N,N′-亚烷基双酰胺.该法操作简便、反应时间短、产率高和催化剂可重复使用.
A series of N,
氧疗是慢性阻塞性肺病(ＣＯＰＤ)的标准治疗方式。对慢性支气管炎或肺气肿患者,适当的氧疗可纠正低氧血症,降低肺动脉压和发病率。非控制氧疗可引起肺泡通气下降、呼吸性酸中毒及意识
与生理盐水相比,等渗镁对醋甲胆碱及组胺引起的支气管狭窄具有抑制作用,且血清镁水平持久增加可通过β２受体亲和力的增加而增强沙丁胺醇的支气管扩张作用。本研究的目的是测定
Objective: To compare IVF outcomes among women of different ethnic backgrounds. Method. This was a retrospective cohort study. Between August 1994 and March 199
OBJECTIVE: Hysterectomy is the most common major surgical procedure performed in the United States for nonobstetric reasons. Although most hysterectomies includ
唑仑膦酸 (ｚｏｌｅｄｒｏｎｉｃａｃｉｄ)的结构式如下 :检测了短期内唑仑膦酸酯 (ｚｏｌｅｄｒｏｎａｔｅ) 10 0ｍｍｏｌ·Ｌ- 1单独使用或与他莫昔芬 (0 .0 1和 0 .1ｍｍｏｌ·Ｌ- 1)或与紫杉醇 (2ｎｍｏｌ·Ｌ- 1)合用作用于体外ＭＣＦ7乳腺肿瘤细胞的效应。用唑
患者女,29岁,已婚1年半,无避孕措施,月经规则,从未生育,孕0产0,过去史无特殊.停经63 d就诊,尿液妊娠试验阳性,未出现不适.阴道实时超声检查子宫内未见孕囊,子宫内膜厚约8 mm,探及右卵巢旁21 mm混合性块物,多普勒提示周围血流较丰富,疑为"右输卵管妊娠",收治住院.间隔48 h后,化验血清β-人绒毛膜促性腺激素(β-hCG),由2150 IU/L上升到2980 IU/L,孕酮15 ng
OBJECTIVE: To assess risk factors for legal induced abortion related deaths. METHODS: This is a descriptive epidemiologic study of women dying of complications
OBJECTIVE: Elevated counts of nucleated red blood cells (NRBCs), as well as prolongation of pregnancy, have been suggested as predictors of adverse perinatal ou
城市学龄前儿童的营养状况如何?这是家长们关心的问题,也是有关部门人士所关注的问题。为此,某城市的医务人员深入到托儿所、幼儿园及家庭对这些儿童进行了调查和研究,共调