HPLC法测定链麻滴鼻液中硫酸链霉素和盐酸麻黄碱的含量

目的建立测定链麻滴鼻液中硫酸链霉素和盐酸麻黄碱含量的高效液相色谱法,消除焦亚硫酸钠对硫酸链霉素含量测定的影响。方法色谱柱为Diamonsil C18柱(250mm×4.6mm,5μm);流动相为0.014mol·L-1庚烷磺酸钠的0.05mol·L-1磷酸二氢钾溶液-乙腈(78∶22);检测波长硫酸链霉素195nm,盐酸麻黄碱207nm;流速1.0mL·min-1。结果硫酸链霉素质量浓度在44.40³10.80μg·mL-1范围内,与其峰面积呈良好的线性关系。(r=0.999 8,n=7),平均回收率为103.4%(RSD=3.4%);盐酸麻黄碱质量浓度在20.224310.80μg·mL-1范围内,与其峰面积呈良好的线性关系。(r=0.999 8,n=7),平均回收率为103.4%(RSD=3.4%);盐酸麻黄碱质量浓度在20.224⁸0.896μg·mL-1范围内,与其峰面积呈良好的线性关系(r=0.999 9,n=7),平均回收率为99.5%(RSD=1.0%)。结论该方法专属性强、测定结果准确、精密度高、线性好,加入甲醛能够消除辅料中焦亚硫酸钠对硫酸链霉素含量测定的影响。     

青霉素、链霉素体外对人脐带组织源间充质干细胞胞外分泌物基因表达的影响

本研究探讨青霉素和链霉素对人脐带组织源间充质干细胞增殖、凋亡和胞外分泌物基因表达的影响。首先分离培养人脐带间充质干细胞,然后检测其免疫表型以及向成骨细胞和脂肪细胞分化的能力,并用MTT法检测细胞增殖,定量RT-PCR法检测胞外分泌物(ECS)和凋亡相关基因(bcl-2,bax)的cDNA表达。结果表明:培养得到的贴壁细胞表型符合间充质干细胞特征,低浓度的青霉素和链霉素可以有效促进脐带间充质干细胞的增殖,其最佳作用浓度为100 U/ml;同时青霉素和链霉素能降低其细胞外分泌物(extracellular secretion,ECS)成分的表达,抗生素浓度越高,ECS表达降低越多;而且低浓度的青链霉素还能提高bcl-2/bax的cDNA表达比值。结论:在脐带MSC的体外培养中,低浓度的青霉素、链霉素可增加细胞增殖,降低凋亡比率,但大剂量使用会降低脐带MSC胞外分泌物的基因表达。     

A successful strategy for the use of synergistic intravenous streptomycin in a hemodialysis patient with refractory Enterococcus faecalis bacteremia

Streptomycin has been available for over 60 years, yet optimal dosing in hemodialysis (HD) patients is not well defined. We report the successful treatment of enterococcal bacteremia in an HD patient with intravenous (IV) penicillin G and IV streptomycin at a dose of 7.5 mg/kg after HD sessions.     

互为内标法测定奈替米星和链霉素的血药浓度

目的：建立人血清中硫酸奈替米星和硫酸链霉素的浓度的HPLC测定方法。方法：采用色谱柱KromnsilC18柱（250mm×4．6mm,5μm）,流动相为乙腈-磷酸盐缓冲液（10：90,pH2．5,含10mmol／L庚烷基硫酸钠）,流速0．8mL／min,柱温40℃,检测波长205nm。奈替米星和链霉素互为内标。结果：本法奈替米星和链霉素的线性范围分别为：2mg·L-1～20mg·L-1（r=0．9995,n=6）及1mg·L-1～60mg·L-1（r=0．9992,n=6）。回收率分别为100．9％及99．8％,奈替米星的日内日间RSD分别为3．95％、5．10％;链霉素的日内日间RSD分别为4．22％、5．09％。结论：本法灵敏度较高,结果准确可靠,操作简便,适合临床常规血药浓度监测。     

mTOR inhibition with rapamycin causes impaired insulin signalling and glucose uptake in human subcutaneous and omental adipocytes

Rapamycin is an immunosuppressive agent used after organ transplantation, but its molecular effects on glucose metabolism needs further evaluation. We explored rapamycin effects on glucose uptake and insulin signalling proteins in adipocytes obtained via subcutaneous (n=62) and omental (n=10) fat biopsies in human donors. At therapeutic concentration (0.01 μM) rapamycin reduced basal and insulin-stimulated glucose uptake by 20-30%, after short-term (15 min) or long-term (20 h) culture of subcutaneous (n=23 and n=10) and omental adipocytes (n=6 and n=7). Rapamycin reduced PKB Ser473 and AS160 Thr642 phosphorylation, and IRS2 protein levels in subcutaneous adipocytes. Additionally, it reduced mTOR-raptor, mTOR-rictor and mTOR-Sin1 interactions, suggesting decreased mTORC1 and mTORC2 formation. Rapamycin also reduced IR Tyr1146 and IRS1 Ser307/Ser616/Ser636 phosphorylation, whereas no effects were observed on the insulin stimulated IRS1-Tyr and TSC2 Thr1462 phosphorylation. This is the first study to show that rapamycin reduces glucose uptake in human adipocytes through impaired insulin signalling and this may contribute to the development of insulin resistance associated with rapamycin therapy.     

抗菌药物联合应用治疗布鲁氏菌病效果观察

目的 观察研究利福平+强力霉素、利福平+链霉素2种治疗方案治疗布鲁氏菌病（布病）的效果。方法　选择330例各期布病患者，采用2种不同方案联合用药进行治疗，于疗程结束后观察治疗效果。结果　效果表明联合用药有良好治疗效果，近期治愈率达73.3%，有效率达100%。结论　抗菌药物联合用药治疗布病可取得较好效果。     

A simple approach for enhanced immune response using engineered dendritic cell targeted nanoparticles

In this study, we demonstrate a simple strategy for enhanced immune response using a two-component dendritic cell (DC) targeted antigen delivery system. One component consists of a recombinant bifunctional fusion protein (bfFp) used for DC targeting, whereas, the other component is made of biotinylated PLGA nanoparticles that encapsulate the antigen. The fusion protein (bfFp) made of a truncated core-streptavidin fused to anti-DEC-205 single chain antibody (scFv) was mixed with ovalbumin-loaded biotinylated NPs that were formulated using biotin–PEG (2000)–PLGA, and the combination, bfFp functionalized NPs was used for DC targeted antigen delivery. In vitro DC uptake studies revealed a 2-fold higher receptor-mediated uptake of bfFp functionalized NPs when compared to non-targeted NPs. Immunization of the mice with the bfFp functionalized NPs in conjunction with DC maturation stimulus (anti-CD40 mAb) enhanced OVA-specific IgG and IgG subclass responses. Splenocytes of these mice secreted significantly higher levels of Th1 (IFN-γ and IL-2) cytokines upon ex vivo restimulation with OVA. The promising outcomes of the bfFp functionalized DC targeted system support its use as a versatile vaccine delivery system for the design of monovalent or polyvalent vaccines.     

基于主元分析和模糊模型的链霉素发酵过程建模

基于主元分析和模糊模型 ,提出了一种简单而有效的链霉素发酵过程产物浓度的预报方法 .该方法采用主元分析压缩关联程度高且含有测量噪声的实际工业生产数据 ,筛选出影响产物浓度的主要过程变量 ,构造了模糊分段线性模型的产物浓度估计器 .与线性多元回归模型相比 ,模糊模型更适合作为间歇发酵过程的状态估计器 .