羧基化多壁碳纳米管修饰电极伏安法测定多巴胺

目的 :研究用羧基化多壁碳纳米管修饰电极伏安法测定痕量多巴胺 (DA)的效果。方法 :采用涂布法制成羧基化多壁碳纳米管修饰电极 ;在pH =5 .4的KH2 PO4 Na2 HPO4缓冲溶液中 ,采用该修饰电极伏安法测定DA。结果 :该修饰电极对DA有着显著的电催化作用 ,与裸玻碳电极相比较 ,其灵敏度大大提高 ,在2 .0× 10 -7～ 6 .0× 10 -4mol/L浓度范围内 ,DA的氧化峰电流与浓度成良好的线性关系 ,检测限为 5 .0× 10 -8mol/L。将该修饰电极用于盐酸多巴胺针剂的测定 ,相对平均偏差为 1.4 % ,平均回收率为 99.2 %。结论 :该修饰电极响应快 ,灵敏度高 ,稳定性好 ,寿命长 ,适合于具有电活性生物分子的测定     

纳米金修饰玻碳电极测定痕量邻苯二酚

目的:建立纳米金修饰玻碳电极(AuNPs/GC)测定痕量邻苯二酚的新型检测方法.方法:采用循环伏安法研究了邻苯二酚在该电极上的电化学行为.考察了支持电解质的pH、沉积电位对邻苯二酚响应值的影响.结果:AuNPs/GC电极对邻苯二酚有很强的电催化作用.在优化的实验条件下,邻苯二酚的氧化峰电流在1.0×10-6~1.0×10-4 mol/L浓度范围内呈良好的线性关系,相关系数为0.9997,检出限为3.0×10-8 mol/L.相对标准偏差为2.7%(5.0×10-5 mol/L邻苯二酚,n=10).结论:该修饰电极制备简便,具有良好的稳定性,将其用于环境水样中邻苯二酚含量检测结果满意.     

多巴胺在纳米金/氰霉氨修饰金电极上的电化学行为

目的:探索一种利用纳米金(Nano - Au)修饰电极测定多巴胺(DA)的新型检测方法.方法:通过循环伏安法(CV)对纳米金修饰电极进行表征并研究多巴胺(DA)在此修饰电极上的电化学性质.结果:在pH为7.0的磷酸盐缓冲液(PBS)中,多巴胺在该修饰电极上产生一灵敏的氧化峰,峰电流与DA浓度成线性关系.利用差分脉冲法(DPV)测定DA的浓度在1.0×10-6 mol/L～1.0×10-4 mol/L范围内线性关系良好,检出限为5.6×10-7mol/L.结论:本方法用于多巴胺针剂的检测具有检出限低,稳定性好的特点,可灵敏、准确地获得满意的结果.     

羧基化多壁碳纳米管修饰电极对秦皮中秦皮乙素的灵敏测定

目的研究秦皮乙素在羧基化多壁碳纳米管(c-MWCNTs)修饰电极上的电化学行为及其测定方法。方法利用交流阻抗法(EIS)和循环伏安法(CV)表征修饰电极,用CV研究秦皮乙素在电极上的电化学行为,以差示脉冲伏安(DPV)对其含量进行测定。结果 c-MWCNTs修饰电极对秦皮乙素有明显的电催化作用,在pH4.5磷酸缓冲液(PBS)中,氧化峰电流与秦皮乙素浓度在6.0×10-2～8.0μmol/L范围内呈良好的线性关系,检测限为5.0×10-3μmol/L。结论 c-MWCNTs修饰电极与裸玻碳电极(GCE)相比,提高了秦皮乙素的检测灵敏度,可用于实际样品中秦皮乙素含量的测定。     

固相萃取-差示脉冲伏安法测定牛黄解毒片的黄芩苷

目的 研究黄芩苷在玻碳电极上的伏安行为,建立牛黄解毒片中黄芩苷的含量测定方法. 方法 Waters Plus-C18(1 mL/50 mg,30 μm)固相萃取柱进行样品前处理,采用循环伏安法与差示脉冲伏安法研究黄芩苷在玻碳电极上的伏安行为. 结果 用20%甲醇1.0 mL能完全洗脱黄芩苷;在pH 3.0磷酸盐缓冲溶液中,黄芩苷的差示脉冲伏安峰电流与其浓度在1×10-6～9×10-5 mol/L呈良好的线性关系,检测限为1×10-7mol/L. 结论 本法简便、经济,灵敏度高,用于牛黄解毒片中黄芩苷的含量测定效果满意.     

氧化石墨烯/壳聚糖修饰玻碳电极同时测定己烯雌酚和辛基酚

目的:建立同时测定己烯雌酚(diethylstilbestrol,DES)和辛基酚(octylphenol,OP)的电化学方法。方法:通过自组装技术将氧化石墨烯(graphene oxide,GO)组装到壳聚糖修饰的玻碳电极表面,构建GO-壳聚糖修饰玻碳电极,用循环伏安法和差分脉冲伏安法研究DES和OP在该修饰电极上的电化学行为及其测定,利用Origin8软件多峰曲线拟合分析实验数据。结果:在p H 7.0磷酸盐缓冲溶液中,同时测定DES和OP的线性范围分别为3.31×10-7~1.24×10-5 mol/L和2.89×10-7~9.50×10-6mol/L,检测限为7.56×10-8 mol/L。且该修饰电极具有良好的重复性和稳定性。结论:GO/壳聚糖修饰玻碳电极测定酚类环境刺激素具有简单、快速等优点,可同时测定DES和OP的混合样品。     

吸附伏安法测定人发中微量铁含量

①目的　测定人发中微量铁含量。②方法　以Fe3 + 和 2 (5′ 溴 2′ 吡啶偶氮 ) 5 二乙基氨基苯酚反应形成配合物为基础 ,建立一种灵敏的吸附伏安法用于测定人发中微量铁含量。③结果　建立了准确测定微量铁的吸附伏安法 ,该方法微量铁检出限为 2 .0× 10 -9mol/L ,线性范围为 6 .7× 10 -9～ 2 .0× 10 -7mol/L ,回收率为 99.6 %～10 1.2 %。④结论　该方法适用于准确测定人发中微量铁含量     

聚脯氨酸修饰电极循环伏安法选择性测定去甲肾上腺素

目的 建立聚脯氨酸修饰电极测定去甲肾上腺素的新方法,并有效排除肾上腺素与抗坏血酸干扰.方法 在pH 9.0的磷酸盐缓冲溶液中.用循环伏安法制备了聚脯氨酸修饰电极,研究去甲肾上腺索在聚合物薄膜上的电化学行为,建立测定去甲肾上腺素的电化学分析新方法.结果 在pH 7.0的磷酸盐缓冲溶液中,去甲肾上腺素在修饰电极上呈现一对灵敏的氧化还原峰,利用循环伏安法测定其还原峰电流可排除肾上腺素与抗坏血酸干扰.去甲肾上腺素检测的线性范围是7.0×10-7～1.1×10-4mol/L:检出限为6.0×10-8mol/L.结论 该修饰电极具有良好的灵敏度、选择性和稳定性,用于药剂样品分析,结果满意.     

丁二酮肟碳糊化学修饰电极溶出伏安法测定人发中微量镍、钴的研究

研究了在丁二酮肟碳糊化学修饰电极上测定人发中微量镍、钴的可行性,经化学富集Ni(Ⅱ)和电化学富集Co(Ⅱ),阴极溶出伏安法测定,Ni(Ⅱ)、Co(Ⅱ)在该电极上均有良好的响应,探讨了有关实验条件。该法对镍、钴的检测限分别可达1.0×10~(-9)mol/L和4.2×10~(-10)mol/L,应用于头发中微量镍,钴的测定,结果满意。     

气隙式脲酶pH电极的研究

本文报道用自制气隙式气敏电极及脲酶滤纸组成脲酶电极测定血浆中尿素含量,测得标准曲线在5×10~(-4)～5×10~(-2)mol/L范围内线性良好,在17℃时电极级差为0.86,r为0.999;电极性能稳定,测定方法简便,可用作临床分析。     

Value of D-Dimers in patients with acute aortic dissection

Objective: To evaluatel the value of D-dimers in patients with acute aortic dissection (AAD). Methods: This study consisted of 16 patients with AAD and 27 non-AAD patients. Serum D-dimets were measured by Sta-Liatest D-DI immunoturbidimetric assay. Results: D-dimer level was higher (P ＜ 0.001) in patients with AAD(7.91 ± 5.52 μg/ml) than that in non- AAD group(1.57±1.24 μg/ml). D-dimer was positive (＞0.4 μg/ml) in all patients with AAD and in 10 control group patients (37%). Among patients with acute AAD, D-dimers tended to be higher in Stanford A than in Stanford B (8.67 ± 4.31 μg/ml vs. 3.24±1.27 μg/ml, P ＜0.01). D-dimer values tended to be higher in more extended disease(3.84 ± 1.65 μg/ml, 8.57 ± 3.58 μg/ml and 11.87 ± 5.69 μg/ml in thoracic aorta, thoracic and abdominal aorta, thoracic and abdominal aorta and iliacal arteries, respectively, P ＜ 0.05 for both 8.57 ± 3.58 and 11.87 ± 5.69 vs. 3.84 ± 1.65 ). Including the control group into the analysis, we found a sensitivity of 100%, a negative predictive value of 100%, and a specificity of 66% and a positive predictive value of 64% for D-dimer in diagnosis of AAD in our patients with suspected AAD. Conclusion: D-dimer was elevated in patients with AAD. A negative D-dimer test result could be useful in excluding AAD.     

Research of combined liver-kidney transplantation model in rats

Objective： To set up a simple and reliable rat model of combined liver-kidney transplantation. Methods： SD rats served as both donors and recipients. 4℃ sodium lactate Ringer＇s was infused from portal veins to donated livers,and from abdominal aorta to donated kidneys, respectively. Anastomosis of the portal vein and the inferior vena cava （IVC） inferior to the right kidney between the graft and the recipient was performed by a double cuff method, then the superior hepatic vena cava with suture. A patch of donated renal artery was anastomosed to the recipient abdominal aorta. The urethra and bile duct were reconstructed with a simple inside bracket. Results： Among 65 cases of combined liver-kidney transplantation, the success rate in the late 40 cases was 77.5%. The function of the grafted liver and kidney remained normal. Conclusion： This rat model of combined liver-kidney transplantation can be established in common laboratory conditions with high success rate and meet the needs of renal transplantation experiment.     

BLOOD PRESSURE CHANGE WITH AGE IN SALT-SENSITIVE TEENAGERS

Objective To observe blood pressure change with age in salt-sensitive teenagers whose salt sensitivity were determined by repeated testing.Methods Salt sensitivity was determined through intravenous infusion of normal saline combined with volume-depletion by oral diuretic furosemide in 55 teenagers. After five years, salt sensitivity was re-examined and subject blood pressure was followed up. Blood pressure changes in salt-sensitive teenagers were compared to that of non-salt sensitive teenagers over five years.Results After 5 years, the repetition rate of salt sensitivity determined by intravenous saline loading is 92.7%. In teenagers with salt sensitivity on the baseline, both the systolic blood pressure increments and increment rates were much higher than non-salt sensitive teenagers (12.7±12.1 mmHg vs. 2.8±5.2 mmHg, P＜ 0.01; 12.2%± 12.0% vs. 2.5% ±4.4%, P＜ 0.001,respectively). There was a similar trend for diastolic blood pressure (8.4 ± 6.4 mmHg vs. 3.7 ± 6.4 mmHg, P = 0.052; 13.2% ±10.6 % vs. 6.8%± 10.1%, P = 0.053, respectively).Conclusions Salt sensitivity determined by intravenous saline loading showed good reproducibility. Blood pressure increments with age were much higher in salt-sensitive teenagers than non-salt sensitive teenagers, especially in terms of systolic blood pressure.     

安心颗粒对急诊经皮冠状动脉介入术后生活质量影响的研究

目的：评价使用安心颗粒对急诊经皮冠状动脉介入术（PPCI）术后生活质量的影响.方法：将160例接受PPCI的急性ST段抬高型心肌梗死患者随机分为安心颗粒组（术前顿服安心颗粒8.8g,术后安心颗粒4.4 g/次,每日2次）和对照组（仅接受基础药物治疗）.所有患者均服用阿司匹林、氯吡格雷和阿托伐他汀.分别在入院时、出院前1d、出院后180 d时,应用心肌梗死多维度量表（MIDAS）、中文版SF-36评价量表对患者生活质量评分.并观察术后30 d以内的出血并发症、血小板减少症发生情况.结果：入院时和出院前1d,两组患者的心肌梗死MIDAS、SF-36量表评分比较无差异（P＞0.05）;出院后180 d时,与对照组比较,安心颗粒组MIDAS、SF-36评分明显减低（P＜0.05）;组内与入院时比较,两组出院前1d、出院后180 d时,MIDAS、SF-36评分均降低（P＜0.05）.两组患者在随访期间均无大量出血、少量出血、重度和极重度血小板减少症发生,安心颗粒组有4例、对照组有7例发生不明显出血（P＞0.05）.两组发生轻度血小板减少症的患者数比较无差异（P＞0.05）.结论：PPCI使用安心颗粒,能改善急性ST段抬高型心肌梗死患者的生活质量,且不增加出血风险.     

The comparative studies of the influences of Urapidil and Nicardipine on sino-atrial node function, atrio-ventricular node function and hemodynamics

Objective:To investigate the influences of urapidil and nicardipine on rabbit sinus function,atrio-ventricular node function and hemodynamics.Methods:Thirty-two Angora's rabbits were selected and randomly divided into four groups.U1 group:urapidil 0.25 mg/kg;U2 group:urapidil 0.5 mg/kg;N1 group:nicardipine 10 μg/kg;N2 group:nicardipine 20 μg/kg.All these medicine were administrated within 30 seconds.Measurements were taken before and after the administration of urapidil or nicardipine for the following data:mean blood pressure(MAP),heart rate(HR),sino-atrial conduction time(SACT),maximal sinoatrial recovery time(SNRTmax)corrected sinus node recovery time(CSNRT),index of sinus node recovery time(SNRTI),Wenckebach A-V conduction frequency (WB),and P-R interval.Results:Significant MAP and HR changes were identified in all of the four groups before and after administration of both urapidil and nicardipine.No significant changes could be found in the rest of the parameters.Intergroup analysis showed that SACT and CSNRT of N1 and N2 groups were shorter than those of the U2 group(P＜0.01);the MAP decreased(P＜0.01)and the HR increased drastically(P＜0.01).Conclusions:Neither urapidil(0.25 mg/kg,0.5 mg/kg)nor nicardipine(10μg/kg,20μg/kg)has any significant influence on rabbit sinus function or rabbit atrio-ventricular node function.Nicardipine could be a better choice than urapidil for parafunctional sinus node patients.     

Expression of OPGmRNA and ODFmRNA in the patients of hip fracture due to osteoporosis

Objective：To investigate the gene expression of osteoprotegerin（OPG） and osteoclast differentiation factor（ODF） in the bone tissue of patients with hip fracture due to osteoporosis. Methods：OPGmRNA and ODFmRNA in the bone tissue in 50 cases of osteoporosis sufferers（over 50 years old） with hip fracture（Observer Group） and 30 cases of hip facture sufferers with no osteoporosis（Control group） were analyzed with the Semi-Quantitative RT-PCR method. Results：The mRNA expressed of ODF, OPG were both high in the patients with hip fracture. In the control group, the expression of OPG mRNA was observed, while the expression of ODF mRNA was very slight. Conclusion：Aged patients contained all signals including OPG, ODF that are essential for inducing osteoclastogenesis and promoting bone resorption.     

The clinicopathological and immuohistochemical analysis of solid-pseudopapillary tumor of the pancreas： report of 9 cases

Objective：To investigate the clinical features, pathological characteristics and immunophenotype of solid-pseudopapillary tumor of the pancreas（SPTP）. Methods：Nine surgically treated cases of SPTP were retrospectively reviewed. Hematoxylin and Eosin（HE） staining and immunohistochemical staining were used to analyze all cases, and the general clinical data was collected. Results：Six patients were asymptomatic except for a palpable mass. Two patients complained of vague-epigastric pain. One patient appeared jaundice. The tumor was encapsulated and solid tissues alternately with cystic tissues. Histologically, the histological structure of solid portion was pseudopapillary with a fibrovascular core. Tumor cells were uniform and medium-sized which were arranged in sheets ets or nests or pseudopapillary patterns. Immunohistochemical studies demonstrated that SPTP proved positive in vimentin（9/9 cases）, AAT（9/9 cases）, NSE（9/9 cases）, ACT（7/9 cases）, CK20（2/9 cases）, CgA（1/9 cases）, S-100（3/gcases）, PR（4/gcases）, Syn（3/9 cases） and CD56（5/9cases）, negative in CEA and ER. Conclusion：SPTP is a tumor predominantly occurring in young women frequently without special symptoms. This tumor has various characteristical histological patterns with different immunophenotype.     

Dynamic Changes in Serum Estradiol and Progesterone levels in Patients of Premenstrual Syndrome with Adverse Flow of Liver-qi

Objective:To probe into the influence of changes of ovarian hormones on the pathogenesis of the specific sub-type premenstrual syndrome(PMS)and reveal partial microcosmic mechanisms of adverse flow of liver-qi.Methods:Estradiol(E2)and progesterone(P)levels in serum were determined at different phases of menstrual cycle by radioimmunoassay.Results:In the group of PMS with adverse flow of liver-qi.the secretive peak value Of E2 and P at the follicular phase significantly decreased,and the secretive peak value at the luteal phase did not come into being.Conclusions:Low E2 and P secretive peak at the follicular phase and absence of secretive peak at the luteal phase is one of the microcosmic mechanisms of PMS with adverse flow of liver-qi.One of the pathophysiologic mechanisms of specific sub-type PMS is probably the continuous low level of E2and P.     

Real-time Three-dimensional Echocardiography in Assessment of Left Ventricular and Right Ventricular Volumes

Real-time three-dimensional echocardiography (RT3DE)is a new ultrasound technique that enables dynamic threedimensional visualization and quantification of the heart in real time. Investigation of feasibility and methodology of RT3DE in determining left ventricular (LV) and right ventricular (RV) volumes, RT3DE was performed in 35 normal adults using Philips SONOS 7500 system with a 2-4 MHz matrix array transducer. The 60°×60° "pyramid" volume database was obtained and analyzed on a TomTec echo workstation. Both LV and RV volumes were calculated with four 3DE methods (i.e. apical 2, 4, 8, and 16-plane) through manually tracing ventricular endocardial borders in end diastole and end systole. Stroke volumes were then calculated. LV volume was also measured by 2DE Simpson's rule using GE VIVID 7 ultrasound machine.     

SCREENING FOR A 21-CHROMOSOME ABNORMALITY IN PREIMPLANTED EMBRYOS OF ELDERLY WOMEN

Increasing maternal age is the only etiological factor unequivocally linked to Down's syndrome in humans. The occurrence rate of newborns with Down's syndrome is about 1/220 in women over 35 years old. However, the occurrence rate in embryos fertilized in vitro, of the elder woman is unclear. Using FISH we screened the number of chromosome 21 in preimplanted embryos of 5 elderly women (average age, 38.4 years) to study the feasibility and necessity of screening trisomy 21 in embryos in patients over 35 years old at the in vitro fertilization (IVF) center.