石墨炉原子吸收光谱法测定雨生红球藻中铅含量

对雨生红球藻中铅含量检测方法进行研究,以可控恒温加热板对雨生红球藻进行炭化前处理,磷酸二氢铵作为基体改进剂,考察了样品前处理、基体改进剂用量、灰化温度、原子化温度对测定的影响。通过优化测定条件,确定Zeeman石墨炉原子吸收光谱法测定雨生红球藻中铅含量的方法。并通过测定国家标准物质杨树叶和茶树叶进行验证,方法灵敏度高,重现性好。该方法可用于雨生红球藻生产全过程铅含量控制检验,对雨生红球藻食品安全具有重要意义。     

超高压一步法萃取雨生红球藻孢子中虾青素工艺研究

研究了低温超高压法将雨生红球藻孢子破壁并提取其虾青素的工艺条件。通过研究各因素对雨生红球藻中虾青素转移率的影响,确定最优工艺条件为：提取溶剂为红花籽油,提取压力200MPa,提取温度4℃,提取2次,液固比分别为10mL/g。在此工艺条件下,雨生红球藻孢子几乎可以完全破壁,虾青素转移率可达到90%。超高压法可以将雨生红球藻孢子破壁较完全,提高了虾青素转移率,缩短了提取时间。     

两种不同培养基体外培养阴道毛滴虫的增殖效果比较

目的 筛选阴道毛滴虫体外生长的适宜培养基.方法 分别配制RPMI-1640和半胱氨酸-肝-胨-麦芽糖(肝浸汤)培养基培养基,并接种阴道毛滴虫,接种密度为12.5×104个/mL,pH值为5.8,置37 ℃恒温箱培养.血球计数板计数阴道毛滴虫增殖密度并计算增殖倍数,光镜观察虫体形态.结果 阴道毛滴虫在pH 5.8的环境中...     

不同pH值条件下Cr6+对小球藻和斜生栅藻的毒性效应

目的：研究不同pH值条件下,重金属Cr6＋对淡水绿藻小球藻和斜生栅藻生长的毒性效应,为我国水质量基准和标准的科学制定提供参考资料。方法：依据OECD-201藻类生长抑制实验指南,以72h藻生物量为测试终点进行藻类抑制实验。结果：两种藻在不同初始pH值条件下的生长潜势不同,小球藻的最适pH值为7.0,而斜生栅藻的最适pH值为9.0。在不同初始pH值条件下,Cr6＋对小球藻和斜生栅藻的作用均为低浓度（〈0.1mg·L-1）刺激而高浓度（〉0.5mg·L-1）抑制,且浓度越大抑制率越高。对于小球藻Cr6＋在pH值=7.0时毒性最小,在pH值=8.0时毒性最大;对于斜生栅藻Cr6＋在pH值=9.0时毒性最小,在pH值=7.0时毒性最大。结论：Cr6＋在藻的最适pH值条件下毒性最小。     

人芽囊原虫的体外培养

目的：建立人芽囊原虫（Blastocystis hominis,B.h)的连续培养方法,并研究影响其生长的因素,为进一步研究其生活史、致病机理奠定基础。方法：比较不同血清种类、血清量、温度、pH值等条件下虫体生长繁殖情况。结果：B.h在Locke-egg-serum(LES)培养基中生长良好,其最适培养条件为：LES培养基中加含20%小牛血清的Locke液,青霉素、链霉素和两性霉素B,37℃培养,pH6.8-7.0,第5、9天虫体繁殖达高峰;pH7.2-7.8时,第3、6、9天虫体繁殖达高峰。结论：B.h在LES培养基中生长良好,的合适的温度、血清、pH值等条件下,第3、6天或第5天为转种时间,可达到长期培养的目的。     

SD大鼠骨髓间充质干细胞的分离培养方法的研究

目的探讨大鼠骨髓间充质干细胞(MSCs)分离培养的适宜条件。方法取1、2、4个月大鼠各6只,分离MSCs,以0.5×105/m l、1×105/m l、2×105/m l密度接种,通过倒置显微镜观察MSCs增殖情况,绘制生长曲线。流式细胞仪观察细胞周期并绘制细胞周期图。结果利用贴壁法成功培养出MSCs并能使之分裂增殖,但随着传代次数的增加,增殖能力有所下降。在培养过程中大鼠年龄要控制在2月以内,接种密度以1×105/m l适宜。结论贴壁培养法是一种简便易行的培养MSCs方法,操作简单,成功率高,可以作为培养SD大鼠MSCs常规方法。     

不同培养容器和光照对2种微藻生长的影响

目的 研究具药用价值的海洋微藻杜氏盐藻Dunaliella salina和亚心形扁藻Platymonassubcordiformis在不同培养容器以及光照下的细胞生长情况,为促进海洋微藻生物资源的培养保存提供参考.方法 选取杜氏盐藻和亚心形扁藻2种海洋微藻为生物材料,在植物培养箱中分别利用三角瓶和试管,在正常光照和遮光光照条件下开展为期10 d的一次性培养试验,利用倒置显微镜和血球计数板观测微藻细胞密度,统计分析不同培养容器和光照对2种海洋微藻生长影响的作用.结果 在该实验条件下,2种海洋微藻的细胞生长均表现出初期生长缓慢、中期生长快速、后期生长放缓的趋势.杜氏盐藻在三角瓶中正常光照培养条件下的生长最好(504× 104个/mL),其次为在试管中正常光照培养的条件下(364× 104个/mL);亚心型扁藻细胞在三角瓶中正常光照培养的条件下生长最好(227×104个/mL),其次为在三角瓶中遮光处理的条件下(177× 104个/mL).结论 培养容器(三角瓶和试管)和光照(正常光照和遮光)对2种海洋微藻生长的影响均具有统计学意义,在进行微藻生物资源培养和保存时,应充分考虑或利用这2种因素的作用.     

内皮祖细胞培养条件的正交设计研究

目的:研究内皮祖细胞(EPCs)培养的适宜条件.方法:以L827正交表安排影响EPCs扩增贴壁的几个主要因素,光镜下观察集落形成,流式细胞术分析CD34、VE-Cadherin双阳性细胞,以此为指标分析各因素对EPCs培养的影响.结果:血管内皮生长因子(VEGF)及接种密度对集落形成影响显著,内皮细胞生长添加剂(ECGS)及纤维连接蛋白皿底包被无影响.4个因素对EPCs得率均有影响,且VEGF及接种密度之间尚有交互作用.结论:EPCs培养的适宜条件为:皿底包被纤维连接蛋白,5×106/cm2接种密度,VEGF 10 ng/ml及ECGS 150μg/ml.     

三角褐指藻在多波长下藻液吸光度与细胞密度的关系研究

目的研究具潜在药用价值的三角褐指藻Phaeodactylum tricornutum在不同波长下,其藻液吸光度与细胞密度的关系。方法取对数生长后期的三角褐指藻藻液进行梯度稀释,利用显微镜观测微藻细胞密度,利用分光光度计分别测定藻液在8个波长下的吸光度,分析各波长下微藻细胞密度与吸光度的相关性。结果 6个稀释梯度下的细胞密度分别为923×104、453×104、207×104、94×104、47×104、22×104个/mL;不同波长下藻液吸光度有差别。8个波长下,细胞密度与吸光度均存在显著性相关关系,在680、663、420和450 nm波长处相关系数r值较大,分别为0.999 0、0.998 1、0.997 2和0.996 3。结论利用吸光度法检测三角褐指藻细胞生长是一种快速、简便、可行的方法;本试验条件下,在680、663、420和450 nm波长处测定三角褐指藻藻液的吸光度较为适宜。     

明亮发光杆菌连续培养条件的优化

为克服市售冻干粉批次间活性差异较大、检测前需复苏等缺点,对明亮发光杆菌从摇瓶到发酵罐进行逐级放大培养,探索其在发酵罐上的最适连续培养条件,获得连续稳定的发光细菌检测液。在摇瓶条件下得到的最适培养条件为:温度18 ℃,初始pH=7.0,转速200 r/min,接种量2%。在此条件下,菌体最大比发光度可达2 500 mV。在5 L发酵罐中的最适培养条件为:转速200 r/min,通气量0.5 vvm,稀释率0.10 h^-1。在此条件下,对明亮发光杆菌进行多批连续培养,菌体比发光度可稳定在500~1 000 mV,可连续培养10 d左右。     

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.     

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.     

Scientific principles and rigorous processes should be followed in developing clinical guidelines for therapeutic interventions of integrative medicine

A clinical guideline for the therapeutic interventions of integrative medicine may be defined as a written document which states a series of recommendations on therapeutic interventions of integrative medicine for a special disease or condition. The guideline may provide assistance to medical professionals in making clinical decisions aimed at improving the clinical outcome of patients and reducing the costs of medical care（~＇4~. Recommendations issued by a guideline should be based on the best available evidence in both Western and Chinese medicine. For fulfilling this purpose, the development of clinical guidelines for therapeutic interventions in the field of integrative medicine should follow scientific principles and undergo a rigorous processes.