天麻饮片中天麻素的含量测定方法的研究

目的测定天麻饮片中天麻素的含量.方法采用高效液相色谱法.色谱柱为Hypersil C18柱(300×4.6mm,10μm),流动相为乙腈-甲醇-磷酸盐缓冲液-水(101530945),流速1mL·min-1,检测波长为220nm.结果天麻素在0.7～3.8μg范围内呈良好的线性关系,平均加样回收率为97.66%,RSD=2.2%(n=5).结论含量测定方法快速、准确.适用于天麻中天麻素的含量测定.     

S市水质有机物成分分析及遗传毒性研究

分别采集S市两处自来水厂入口处源水与自来水各120L,经XAD－2树脂柱收集其中的有机物,采用GC／MS定性与定量分析有机物成分,同时采用Ames与小鼠骨髓微核试验从基因水平与染色体水平检测其遗传毒性,结果源水与自来水均检出多种有机物,自来水中有机物种类较源水为少。遗传毒性试验表明源水与自来水有不同程度的致突变性,且自来水较源水为强,两种试验结果之间有一定的相关性,说明S市水质受到一定程度的有机物污染,氯化消毒可使水质遗传毒性增加,其机理可能与氯化消毒副产物有关。     

国产C57和BALB／c小鼠年龄相关性听力损失的畸变产物耳声发射检测

目的通过对国产C57和BALB/c近交系小鼠不同日龄时DPOAE的检测,探讨其听力随年龄变化的趋势.方法对不同日龄国产C57和BALB/c近交系小鼠进行DPOAE测试,设定初始音f1、f2(f1/f2=1.22),其强度L1=70dBSPL,L2=65dBSPL,在频率[(f1·     

美洛昔康原药中有关物质和降解产物的HPLC测定

用HPLC测定美洛昔康原药中有关物质和降解产物含量。色谱柱为Waters Novapak C18柱,流动相0．05mol/L磷酸二氢钾（pH4．0）－甲醇（40：60）,检测波长280nm。本法操作简便,准确可靠,原药合成中带入的有关物质和破坏条件下的降解产物与主药有较好的分离度,适用于原料的质量控制。     

建立高效的转基因动物鉴定技术体系

转基因动物的鉴定是转基因动物研究领域的重要内容。本文简要回顾了相关鉴定技术的研究进展 ,建立和完善了特异性PCR扩增及其产物酶切的转基因动物鉴定体系 ,在引物设计、PCR参数优化、设立内源性标记等方面作了进一步的改进 ,提高了PCR的特异性和可靠性。实验表明 ,PCR扩增及其产物酶切是一种准确、灵敏、简便、重现性好的转基因动物筛选鉴定方法     

The effects of succimer chelation therapy on auditory function in rhesus monkeys

Sixty-six female rhesus monkeys were randomly assigned to three lead exposure conditions (none, from birth to 1 year, and from birth to 2 years) by two chelation treatment (succimer and no succimer) conditions. Blood lead levels were maintained at 35–40 μg/dl beginning shortly after birth and continuing for 1 or 2 years postnatally. There were two separate chelation regimes: 53 and 65 weeks of age. Lead and lead–vehicle dosing were discontinued while succimer was administered. Succimer (or placebo) was administered orally at a dose of 30 mg/kg/day (divided into three doses per day) for 5 days and for 14 additional days at 20 mg/kg/day (divided into two doses per day) for a total 19-day treatment regimen. Auditory function was assessed in these monkeys at least 1 year after lead intake had been discontinued. The outcome measures included tympanometry to assess middle ear function, OAEs to assess cochlear function, and ABRs to assess the auditory nerve and brainstem pathways. There were no significant differences as a function of succimer treatment for any of the tympanometric variables measured. Suprathreshold and threshold distortion product otoacoustic emissions were comparable among the succimer and vehicle groups. However, there was a nonsignificant trend to smaller amplitude distortion products at the highest frequencies assessed (6.4–10.0 kHz). Finally, the auditory evoked response at levels from the auditory nerve to the cerebral cortex did not significantly differ as a function of succimer treatment.     

Transient evoked and distortion product otoacoustic emissions following successful stapes surgery

Background: The effect of stapes surgery on the recording of otoacoustic emissions is unknown. The aim of the present study was to evaluate the success of stapes surgery by using acoustically evoked otoacoustic emissions as an objective and fast method for postoperative hearing evaluation. Methods: Transient evoked (TEOAE) and distortion product otoacoustic emissions (DPOAE) were measured consecutively in otosclerosis patients before as well as 3 and 6 months after stapes surgery. Results: Air-bone gaps in the pure-tone audiograms were significantly reduced in all patients. TEOAEs and DPOAEs were not measurable preoperatively and were only evident in one patient postoperatively with low amplitudes in a narrow frequency range. Conclusions: Despite a subjective hearing improvement and a significant reduction of the conductive loss, otoacoustic emissions are only rarely evident after successful stapes surgery. Received: 26 September 2000 / Accepted: 30 November 2000     

Clinical Value of Electrocardiographic Parameters in Genotyped Individuals with Familial Long QT Syndrome

MOENNIG, G., et al. : Clinical Value of Electrocardiographic Parameters in Genotyped Individuals with Familial Long QT Syndrome. Rate corrected QT interval (QTc) and QT dispersion (QTd) have been suggested as markers of an increased propensity to arrhythmic events and efficacy of therapy in patients with long QT syndrome (LQTS). To evaluate whether QTc and QTd correlate to genetic status and clinical symptoms in LQTS patients and their relatives, ECGs of 116 genotyped individuals were analyzed. JTc and QTc were longest in symptomatic patients (  n = 28  ). Both QTd and JTd were significantly higher in symptomatic patients than in asymptomatic (  n = 29  ) or unaffected family members (  n = 59  ). The product of QTd/JTd and QTc/JTc was significantly different among all three groups. Both dispersion and product put additional and independent power on identification of mutation carriers when adjusted for sex and age in a logistic regression analysis. Thus, symptomatic patients with LQTS show marked inhomogenity of repolarization in the surface ECG. QT dispersion and QT product might be helpful in finding LQTS mutation carriers and might serve as additional ECG tools to identify asymptomatic LQTS patients.     

多元点振荡基础平衡数学式的证明

目的证明糖代谢系统在血糖正常或NIDDM人群,空腹状态相关因子和细胞、细胞微单元功能的彼此作用始终处于动态平衡。方法依据空腹间隔30分钟两次肘静脉血糖(G)、胰岛素(I)、C肽(C)检测值较为近似的事实,把G、I、C的首次和再次检测值分别用G_(01),I_(01),C_(01),和G_(02),I_(02),C_(02)表示。其比值G_(02)/G_(01),C_(02)/C_(01),I_(02)/I_(01)称之谓变化度。结论多元点振荡基础平衡数学式式G/l·C·x·y=1/1=1,即:G_(02)/G_(01),C_(02)/C_(01),I_(02)/I_(01)·x·y=1/1=1表达了空腹状态下,糖代谢系统各相关因子和细胞、细胞微单元功能值的变化度,其数学积是1。     

发酵莲子乳对小鼠胃肠道运动、吸收功能的调节作用

目的:探讨发酵莲子乳(LMFP)对胃肠道运动、吸收的调节作用.方法:小鼠按体质量区组随机分组并以蒸馏水、不同药物及不同浓度的LMFP进行相应干预.左旋精氨酸腹腔注射建模,测定胃及小肠酚红残留率及胃组织一氧化氮(NO)含量;复方地芬诺酯灌胃制造便秘模型,观测炭末排出时间、黑便排出量、质量及含水率;皮下注射小剂量利血平建模,计算小肠推进率、尿木糖排出量.结果:胃组织NO含量与胃排空延缓正相关(r=0.475,P=0.010);较之左旋精氨酸模型组,250,500mL/LLMFP组、吗叮啉组胃酚红滞留率降低(22.78±6.95%,27.12±5.73%,22.82±5.63%vs34.76±9.15%,P<0.05),250mL/LLMFP组、吗叮啉组胃NO含量降低(26.13±4.95μmol/gpro,26.33±4.06μmol/gprovs38.33±9.82μmol/gpro,P<0.05),500,750mL/LLMFP组和吗叮啉组远端1/2小肠、750mL/LLMFP组和吗叮啉组远端2/3小肠酚红含量均增高(P<0.05).与复方地芬诺酯模型组相较,各浓度LMFP组炭末排出时间缩短(133.63±18.28,113.25±26.25min,141.75±25.95minvs175.50±24.04min,P<0.05)、黑便含水率升高(39.72±3.06%,42.48±3.07%,40.58±4.29%vs19.67±2.53%,P<0.05);250,500mL/LLMFP组黑便质量增加(0.68±0.16g,0.82±0.23gvs0.37±0.13g,P<0.01);1000mL/LLMFP组小肠推进率低于利血平模型组(79.93±14.52%vs97.64±5.68%,P=0.002),500,1000mL/LLMFP组木糖排出量较利血平模型组增高(10.54±2.48,12.24±2.15mgvs7.86±1.71mg,P<0.05).结论:LMFP对胃肠运动具有双相调节作用,可缓解便秘症状,促进小肠吸收功能.