Analysis about ultrasonic misdiagnosis of lower extremity venous thrombosis

目的通过对下肢静脉血栓超声患者的超声资料进行回顾性分析,总结分析误诊漏诊的原因方法对70例临床怀疑为下肢静脉血栓的病人进行常规静脉彩超检查,对确诊为下肢静脉血栓的患者再行CT静脉造影检查,而后对两者诊断结果进行对照分析。结果 70例临床疑似为下肢静脉血栓病人中,确诊率为57.1%（40/70）,超声误诊率32%（8/25）。结论超声检查无创伤、重复性高,可准确诊断下肢静脉血栓形成。Objective The data of patients with lower extremity venous thrombosis were analyzed retrospectively, and the causes of misdiagnosis and missed diagnosis were summarized. Methods 70 patients with clinical suspicion of lower extremity venous thrombosis were treated by routine venous color Doppler ultrasonography, and the venous thrombosis was diagnosed by CT venous angiography.Results Among 700 patients with clinical suspicion of lower extremity venous thrombosis, the accuracy rate was 57.1%, and the misdiagnosis rate was 32%. Conclusion Because ultrasound examination has high repeatability and no trauma, it can be used to diagnose exactly the lower extremity venous thrombosis.昌吉回族自治州科技局项目（TG-201405

Hira基因产物在银鲫和彩鲫卵子发生过程中的动态变化

为进一步研究Hira基因在卵子发生和雌核发育过程中的作用,通过原位杂交和免疫荧光定位的方法检测了Hira mRNA和蛋白质在雌核发育银鲫和两性生殖彩鲫卵子发生过程中的动态变化。结果表明,银鲫和彩鲫卵子发生过程中Hira基因转录产物的变化基本一致,在Ⅰ期卵母细胞的细胞核中大量表达,至Ⅱ期卵母细胞时转至细胞质中均匀分布,在Ⅲ期卵母细胞中,杂交信号逐渐移向细胞的周边,到Ⅳ期时随着卵黄物质大量积累,杂交信号几乎不见。HIRA蛋白在银鲫和彩鲫卵子发生过程中的变化略有差别。HIRA蛋白在银鲫Ⅰ期卵母细胞中没有表达,

从资源管理到资产经营——论我国城市土地管理模式的转变

“经营土地”是城市治理市场化条件下政府加强土地资产管理的新理念,其实质就是要运用市场经济手段,对土地资产实行市场化运作,实现土地资源的优化配置,从而实现土地资产的价值。从资源管理型转变为资产经营型,这是我国城市土地管理改革的必然选择与现实取向

三坐标测量机零件位置自动识别系统的实现

被测量零件在三坐标测量机位置的自动识别是实现三坐标测量机智能化的关键技术。将CMOS相机与激光器通过夹具固定在三坐标测量机测座上,实现与接触式测头的多传感器集成系统;采用机器视觉方法获取被测量零件的视觉坐标;用VISuAl bASIC 6.0应用程序开发工具对CAd模型接口问题做出了解决方案,实现了从CAd模型中自动提取检测特征与公差要求;根据零件三维信息的获取与图像处理,实现了零件在图像坐标系中位置和方向的自动识别;利用各坐标系之间的转换关系,实现了零件在三坐标测量机机器坐标系中位置和方向的自动识别功能

Partitioning and transport of Polycyclic Aromatic Hydrocarbons in surface water from the downstream to Lingdingyang of Pearl River

为了研究河口水体中多环芳烃(PAHS)的相态分布、传输特征及其变化趋势,本文沿珠江下游至河口对表层水体PAHS进行采样分析。结果显示,16种优控PAHS的总浓度为(17.50~168.35)ng/l,平均83.40 ng/l,其中溶解相为(3.76~83.60)ng/l,颗粒相为(1.59~84.75)ng/l。PAHS浓度自下游至伶仃洋有波动降低的趋势,该趋势受陆源的持续输入、浮游植物的吸附吸收以及海水的稀释作用等因素的共同影响;PAHS组成及两相分配的变化主要受控于输入特征、悬浮颗粒物和黑碳吸附以及盐析效应等环境因子。荧蒽和芘的分配系数kP自珠江下游至伶仃洋的逐渐下降也说明了海水的稀释显著降低了悬浮颗粒物对PAHS的吸附。另外,特征化合物比值沿程的变化不仅指示了PAHS在广州段水体中较长的停留时间,也说明了虎门河口存在持续的PAHS输入。利用主因子分析和多元线性回归的方法,指示出煤和木材燃烧以及机动车排放是该区域表层水体PAHS污染的最主要来源,约贡献了80%的PAHS输入。In order to study the phase distribution,transport and variation of polycyclic aromatic hydrocarbons(PAHs),surface water samples were collected along the downstream to Lingdingyang of Pearl River.The total concentrations of 16 US EPA PAHs ranged from 17.50 ng /L to 168.35 ng /L with the average of 83.40 ng /L [dissolved phase:(3.76 ~ 83.60) ng /L,particle phase:(1.59 ~ 84.75) ng /L].The declining trend of PAHs concentrations was showed from the downstream to Lingdingyang under the influence of the terrestrial continuous inputs,phytoplankton adsorption and seawater dilution.Variations of PAHs composition and partitioning were controlled by input pathway,adsorption of suspended particulate matters(SPM) and black carbons and the salting out effect.The partition coefficients of Fluo and Py decreased gradually indicated that the water dilution affected the adsorption of SPM to PAHs.In addition,the trend of Fluo /(Py + Fluo) suggested the longer retention time of PAHs in downstream of Pearl River and the continuous inputs of PAHs in Humen estuary.The principal factor analysis indicated the coal and wood combustion and vehicle emissions were the major sources of PAHs in the surface water,which contributed almost 80%of PAHs input.国家自然科学基金项目(41276066

Characteristics of PCBs in a Capacitor Storage Site and an Industrial Brownfield

研究了四川资阳机车厂废弃电力电容器封存点与旧工业场地土壤与降尘中28种多氯联苯(PCbS)的污染水平与组成特征.电容器封存山洞未封闭洞口处土壤中PCbS含量最高,28种PCbS的总含量(ΣPCbS)达227 502 ng.g-1,铸铁车间窗台降尘中也有高残留的PCbS,ΣPCbS在10μg.g-1以上,封存点和铸铁车间样品中PCbS单体含量之间均存在显著的正相关关系(P<0.01).高污染样品中PCbS的同族体分布均以四氯代PCbS为最高,其次为三氯代PCbS和五氯代PCbS.与封存点土壤相比,铸铁车间样品中高氯代PCbS的贡献更大.12种类二英PCbS的毒性当量(TEQ)介于75.43~24 027 Pg.g-1之间,远大于电子垃圾拆解区土壤,但普遍都以PCb126的毒性当量贡献占绝对优势.The levels and congener patterns of 28 PCBs compounds were investigated in soil and dust fallout collected in a capacitor storage site and an industrial brownfield,respectively in Sichuan Ziyang Locomotive Factory.The highest concentration of the total PCBs(PCBs=227 502 ng·g-1) was found in soil collected from the front gate(unsealed) of the capacitor storage tunnel.Very high levels of PCBs,exceed 10 μg·g-1,were also found in the dust collected from the window sill of an iron foundry.There were significant positive correlations(P<0.01) among PCB congener concentration in the storage site and the iron foundry samples.The major contribution to the total content of PCBs in the high contaminated samples was tetrachlorinated biphenyls,followed by tri-and penta-chlorinated biphenyls.Hexa-and higher chlorinated biphenyls contributed more to PCBs in the iron foundry than those in the storage site.The total toxicity equivalents(TEQ) of 12 dioxin-like congeners varied in the range of 75.43-24 027 pg·g-1 and were much higher than those in soils of e-waste recycling sites.However,PCB126 contribute the most to the TEQ in most cases.国家自然科学基金项目(40603020);福建省自然科学基金计划项目(2009J05106

邻苯二甲酰化壳聚糖中酰胺酸取代度的红外测定

室温条件下从完全脱乙酰化壳聚糖出发合成了不同酰胺酸取代度的邻苯二甲酰化壳聚糖 ,并以此为标样 ,标样的取代度由X射线光电子能谱 (XPS)确定。研究了以FT IR作为工具测定此系列衍生物的总取代度的方法。以 2 887cm-1的吸收峰作为参比谱带。探针谱带可用 1 71 2cm-1或 74 9cm-1的吸收峰。两种探针谱带所得曲线的斜率分别为 1 1 3和 0 1 2 ,相关系数分别为 0 997和 0 977。此结果表明 :红外法是一种既准确可靠又方便可行的测定方

甲壳素类液晶高分子的研究Ⅵ.邻苯二甲酰化壳聚糖中酰胺酸取代度对液晶性的影响

通过控制不同反应时间和邻苯二甲酸酐 壳聚糖的摩尔比制备不同取代度的邻苯二甲酰化壳聚糖(PHCS) .用FTIR研究了反应机理和产物结构 ,观察到PHCS含两类取代即酰胺酸取代和酰亚胺取代 .反应时间较短时主要为前者 ,取代度表示为DS1 ;反应时间较长时主要为后者 ,取代度表示为DS2 .对PHCS在二氯乙酸 (DCA)中的液晶行为观察 ,结果表明 ,PHCS的临界浓度随DS1 的增加而显著增加 .DS1 对PHCS临界浓度的影响明显大于DS2 的影响 .基本上为酰胺酸取代的PHCS的临界浓度高于溶解度 ,以至于观察不

Determination of Estrogenic Compounds in Water of Jiulong River Using Polar Organic Chemical Integrative Sampler

极性有机物一体化采样器(POCIS)作为富集水体中有机物的新型采样技术,可以反映目标物在被测水体中的时间权重浓度,因此在环境监测中是对主动采样方式的重要补充.本研究采用POCIS进行了4种固醇类雌激素化合物(雌酮、雌二醇、雌三醇及雌炔醇)的富集动力学,以及温度和目标物浓度对POCIS富集雌激素影响的实验室模拟研究.结果表明,POCIS对目标化合物的富集放置时间7 d内呈现显著的线性关系(r2≥0.988 1,P12%),随着温度的升高,目标化合物在POCIS上的采样速率减小.而目标物浓度对POCIS富集没有显著的影响(rSd 12%).As for different concentrations of target compounds,the sampling rate was not affected by the concentrations( RSD < 5%).After laboratory experiments,an environmental field study was performed in Jiulong River.The results showed that there was a relatively good correlation between the measured and calculated values( r2= 0.720 9,P < 0.001).It demonstrated that POCIS can be used in aquatic field systems.近海海洋环境科学国家重点实验室访问学者基金项目; 海洋公益性行业科研专项(201105013

Estimation of the sources of organophosphorus pesticides in Xiamen sea area,

利用SPEGCFPD对厦门附近海域的微表层、表层、底层海水及九龙江入海口高、低潮水中有机磷农药进行了分析.结果表明,有机磷农药的含量范围为:低于检测限～725.54ng·L-1,平均值为136.47ng·L-1.研究海区中马銮内湾有机磷农药污染最为严重(165.77～453.42ng·L-1,平均296.01ng·L-1),九龙江口、西海域和西南海域污染水平接近(16.26～200.65ng·L-1,平均84.59ng·L-1),东部海域有机磷农药污染最轻(10.38～66.01ng·L-1,平均38.14ng·L-1).九龙江入海口高潮水中农药的浓度明显低于低潮水中浓度,说明海域中多数农药污染来源于九龙江流域输入,少数农药来源于海域周边地区或九龙江流域和海域周边地区共同输入,微表层对有机磷农药的富集作用不明显. 【英文摘要】 Organophosphorus Pesticides (OPPs) were determined in microsurface water, subsurface water and bottom water in Xiamen sea area with SPE-GC-FPD. The result showed that the levels of all OPPs ranged from below detection limit to 725.54ng·L -1, the mean was 136.47ng·L -1. The pollution in Maluan Bay was the most serious(165.77～453.42ng·L -1,mean 296.01ng·L -1) and the Eastern Sea was the slightest(10.38～66.01ng·L -1,mean 38.14ng·L -1). Meanwhile, the levels of OPPs in Jiulong estuary were closed to that in the...国家自然科学基金(No.40106012)~