薄层色谱法测定大活络丸中去氢木香内酯的含量

目的测定大活络丸中去氢木香内酯的含量。方法薄层色谱法。结果测定方法的平均加样回收率为98.30%,RSD为1.90%(n=6)。结论该方法简便、准确、重现性好,可为该制剂质量控制提供参考。     

苍耳属中倍半萜内酯的研究进展

介绍了近年来苍耳属植物中倍半萜内酯化合物的研究概况,包括准确的结构式、植物来源及波谱数据。由于其具有多种活性,尤其是抗肿瘤、抗癌活性,故倍受重视。     

Development of multiple food allergies in children taking tacrolimus after heart and liver transplantation

Angioedema and chronic diarrhea in patients taking immunosuppressants are not always because of side effects and could be a new onset of food allergy. Our aim is to discuss the pathogenesis and treatment of the post-transplant development of food allergies. The first patient was receiving tacrolimus subsequent to heart transplantation and developed angioedema after consumption of dairy products at 12 months after transplantation. He was found to be allergic to multiple foods by both RAST and ImmunoCAP tests. The second patient with argininosuccinic aciduria, post-liver transplant, also received tacrolimus and developed chronic non-mucoid/bloody diarrhea at seven months following transplantation. ImmunoCAP test was positive only for egg white and peanuts. Biopsy showed eosinophilic infiltration of the mucosa from the stomach to the rectum. Elimination diets in both patients resolved the symptoms. These cases suggest a direct relationship between tacrolimus and development of food allergy.     

Quorum sensing in Acinetobacter: an emerging pathogen

Acinetobacter is emerging as one of the major nosocomial infectious pathogens, facilitated by tolerance to desiccation and multidrug resistance. Quorum sensing (autoinducer-receptor mechanism) plays role in biofilm formation in Acinetobacter, though its role in regulation of other virulence factors is yet to be established. Phylogenetic studies indicate that Acinetobacter baumannii is closely related to Burkholderia ambifaria but its quorum sensing genes (abaI and abaR) were acquired horizontally from Halothiobacillus neapolitanus. The prospects of quorum quenching to control the infections caused by Acinetobacter have also been discussed.     

密度感知信号系统在铜绿假单胞菌致大鼠肺部感染中的作用

【论文特点介绍】本实验比较了PAO1和PAO—JP2的弹性蛋白酶活性、外毒素A的含量，结果显示：PAO—JP2株显示了弹性蛋白酶活性、外毒素A表达的完全缺失。结合体内实验结果，证实了密度感知信号系统通过控制铜绿假单孢菌细胞外重要毒性因子，如弹性蛋白酶活性、外毒素A的表达，在铜绿假单孢菌致病作用中扮演重要的角色。使用特定合成的AI或QS抑制剂，来达到抑制铜绿假单孢菌毒性因子的表达，减低其致病作用，是颇有前景的一种抗菌疗法。     

金属—卟啉络合体系引发的活性聚合及不死聚合

金属-卟啉络合物是一类可以引发环氧化物、环硫化物、内酯、丙烯酸酯及α-甲基丙烯酸酯等进行活性聚合或不死聚合的新型引发剂。本文概述了上述两种聚合反应的机理、特点、在高分子合成中的应用及其与其他活性聚合的区别。     

有抗肿瘤活性的青蒿B衍生物

从菊科值物黄花蒿(Artemisia annua L.)中分离得到的青蒿B(arteannuin B)是一个有α-次甲基五元环倍半萜内酯化合物。文献报道一些α-次甲基环内酯萜类化合物具有抗肿瘤活性,如模地胆宁(molephantinin)。     

马桑内酯在大鼠离体海马脑片上引起的癫痫样放电活动

采用大鼠离体海马脑片技术,建立了马桑内酯(Coriaria lactone,CL)引起的海马CA 1区锥体细胞癫痫样放电活动模型,并初步探讨了CL的致痫作用机理,可能与直接影响锥体细胞固有爆发放电能力有关。     

达因35和螺内酯治疗高雄激素血症性月经病的疗效比较

目的:探讨达因35和螺内酯对高雄激素血症月经病的临床效果及二者优缺点。方法:选择73例高雄激素血症月经病患者,随机分成A、B两组,A组用达因35治疗,B组用螺内酯治疗,两组均联合克罗米酚治疗。治疗前及治疗后3个月、6个月检测血清性激素:T、A2、FSH、LH。并观察治疗3个月、6个月及停药后6个月、9个月、1年的月经情况、BBT(基础体温)或B超监测卵泡,观察两组副作用。结果:达因35治疗3个月,血清T、A2、LH下降,与治疗前比P<0.05,31例月经恢复正常周期,随访半年21例、1年13例月经周期仍正常。副反应44％。螺内酯组治疗6个月,血清T、A2、LH下降,P相似文献   

马桑内酯对脑γ－氨基丁酸分泌和谷氨酸脱羧酶及其受体结合力的影响

为探讨癫痫发病的生物化学机制，用培养的大鼠大脑皮层神经元和大脑皮层匀浆及突触膜为模型，采用酶联免疫法，放射分析法观察马桑内酯（ＣＬ）对大鼠脑内γ－氨基丁酸（ＧＡＢＡ）分泌，谷氨酸脱梭酶（ＧＡＤ）活性和谷氨酸（Ｇｌｕ）受体结合力的影响。结果表明，５０μｍｏｌ／ＬＣＬ可抑制ＧＡＢＡ分泌，１２、２４、４８小时抑制率为８．３％～１４。５％；在０．１５～１５０μｍｏｌ／Ｌ范围，ＣＬ可抑制ＧＡＤ活性，抑制率为１．３２％～１８．７６％；ＣＬ在２．８～３５０μｍｏｌ／Ｌ范围内可降低Ｇｌｕ受体结合力，降低程度为１８．８％～３１．６％，且各剂量组与对照组差异均有极显著意义（Ｐ＜０．０１）。证实ＣＬ可抑制培养神经元ＧＡＢＡ分泌，并呈时间依赖和剂量依赖关系。