Automating Angle Measurements on Foot Radiographs in Young Children: Feasibility and Performance of a Convolutional Neural Network Model

Journal of Digital Imaging - Measurement of angles on foot radiographs is an important step in the evaluation of malalignment. The objective is to develop a CNN model to measure angles on...     

Chevron截骨术对外翻足关节接触特征影响的生物力学研究

目的 探究Chevron截骨术截骨远端外侧位移距离对外翻足关节接触特征的影响,为临床上选择合适的位移距离提供参考依据。方法 测量踝关节中立位状态下正常足、外翻足及外翻足Chevron截骨术截骨远端分别向外侧位移2.0、4.0、6.0 mm后前足、中足和后足各关节接触力、峰值压强和接触面积,并对结果进行分析。结果 与正常足相比,外翻足第1跖楔关节（t=-3.33, P=0.02）、跟骰关节（t=-2.74, P=0.03）和距下关节（后关节面）（t=-2.89, P=0.03）的接触力显著增高;外翻足距舟关节（t=-2.73, P=0.03）与跟骰关节（t=-2.74, P=0.03）的峰值压强显著增高;行Chevron截骨术后,随着截骨远端向外侧位移距离的增加,外翻足第1跖楔关节和跟骰关节的接触力逐渐减小;外翻足距舟关节和跟骰关节的峰值压强逐渐减小。结论 中度外翻足行Chevron截骨术后,当第1跖骨截骨远端向外侧位移6 mm时能有效恢复部分关节间力的分布,且能缓解部分关节局部应力集中现象。     

明代《伤寒论》研究对后世的影响

系统研究了明代《伤寒论》文献,指出明代《伤寒论》研究对后世的影响,主要表现在温病学说直接受其催化而趋于成熟,明刻本《伤寒论》为后世提供了研究依据,重编整理导致了后世编次方法之多样,学术论争深化了后世的《伤寒论》研究。认为明代是《伤寒论》研究史上承前启后的重要时期,明代的《伤寒论》研究影响并规定了清代乃至近代的《伤寒论》研究模式和水平。     

An assessment of a urinary biomarker for total human environmental exposure to benzo[a]pyrene

Urinary banzo[a]pyrene (BaP) metabolite levels were compared to human environmental exposure to BaP through inhalation and dietary ingestion to assess the predictive validity of the exposure biomarker. These measurements were made for 14 adult volunteers over 14 consecutive days, once during summer/fall, again during winter periods. Based on personal air monitoring, median potential inhalation doses of 11.0 and 2.3 ng/day were estimated for the winter and summer/fall studies, respectively. A median potential ingested dose of 176 ng/day, estimated from duplicate plate sampling, exceeded inhalation by 6-and 122-fold for the winter and summer/fall studies, respectively. Total urinary BaP metabolites were measured using a published reverse metabolism (BaP) method of analysis. Median rates of urinary BaP metabolite elimination for the winter and summer/fall studies were 121 and 129 ng/day, respectively. The changes in inhaled and ingested potential doses were regressed on the change in urinary metabolite elimination from week 1 to week 2 to test the predictive validity of the biomarker measurement. The regression was statistically significant (r = 0.620, p = 0.015, n = 25) when body weight was included and two extreme values were removed. Consistent with the exposure measurements showing diet as the dominant route of exposure, most of the variation in urinary metabolite elimination was explained by the ingested dose. It is concluded that the measurement of urinary BaP by reverse metabolism is qualitative and of marginal predictive validity as an exposure biomarker due to the method's low recoveries and the large unexplained variance.     

颈部肿块和瘢痕病变致颈动脉窦过敏综合征(附2例报告)

报告１例鼻咽癌颈淋巴结转移致颈动脉窦过敏综合征和１例全喉切除加颈淋巴结清扫术术后瘢痕形成出现颈动脉窦过敏综合征。对耳鼻咽喉科相关疾病引起的颈部肿块和瘢痕病变压迫颈动脉窦所致颈动脉窦过敏综合征的致病原因、临床表现及诊断、治疗原则进行了讨论。此类患者在临床上少见,易误诊,应引起重视。     

肺鳞状细胞癌p53 过度表达与肿瘤生物学行为及预后的关系

目的：探讨肺鳞状细胞癌组织ｐ５３ 蛋白的过度表达与肿瘤生物学行为及预后的关系。方法：应用单克隆抗 ｐ５３ 抗体对石蜡包埋的肺癌组织标本进行免疫组织化学染色。结果：６８ 例获随访的肺鳞状细胞癌病例中有 ４４ 例 ｐ５３ 表达阳性,总阳性率为 ６４７％ ,且其阳性率随肿瘤病理分级、临床分期的增高而增加（ Ｐ＜ ００５）;与术后５ 年存活情况有关（ Ｐ＜ ００５）。结论：提示ｐ５３ 基因的异常表达在肺鳞状细胞癌的发展过程中起重要作用,对肺鳞状细胞癌病人的预后判定有一定意义。     

胎鼠肠管上皮细胞增殖分化与间质血管形成的关系

目的：探讨胎鼠肠管上皮细胞增殖分化与间质血管形成的关系。方法：通过免疫组织化学及电子计算机形态学分析方法,对血管内应生长因子（VEGF）和Ⅳ型胶原在胚胎期13～18d之胎鼠肠管的表达进行研究。结果：①在E13～15时,胎鼠肠管上度增殖胜盛,此后维持在20％左右;②间质血管一直占机体体积的20％左右,比较恒定;③VEGF呈波峰式表达,先在间充质中高表达而后则有上皮表达高峰;④E15～16时,Ⅳ型胶原显示血管基底膜形成完整。结论：胚胎期肠等血管形成不随上皮细胞的增殖而增多,与机体总体积有比较恒常的关系。     

无锡市垃圾无害化处理的卫生学评价

<正> 随着创建卫生城市的开展,垃圾处理日益受到重视,无锡市建立的垃圾处理厂,对垃圾处理采用二次发酵工艺,即“好氧堆肥发酵”、“自然堆肥贮存发酵”。现将发酵结果报道如下。1 材料与方法1.1 实验室条件下(温度26±1℃,相对湿度60％±5％)饲养家蝇1龄蛆500条,家蝇蛹500只。1.2 透气塑料筒20只(自制),编号1～20号1.3 垃圾处理厂的垃圾处理采用2次发酵,第1次机械通风好氧堆肥发酵10d,取出后入库,再第2次自然堆肥贮存发酵10d。     

无锡市肾综合症出血热宿主动物调查初报

对无锡市肾综合症出血热宿主动物调查结果表明:鼠类携带HFRS病毒阳性率5.77％。检出带病毒鼠4种,即小家鼠、黄胸鼠、褐家鼠、黑线姬鼠,其带病毒率分别为8.82％(3/34)、1.64％(1/61)、6.67％(2/30)、9.68％(3/31)。另外,经统计学分析,郊区带病毒鼠阳性明显高于市区(P<0.01)。加强灭鼠,严格控制疫区鼠密度是降低人群肾综合症出血热发病率的关键。     

尸体植入新型人工腰椎间盘腰椎节段生物力学测试

目的:评价植入新型人工腰椎间盘的腰椎节段的稳定性和压缩力学性能。方法:将人工腰椎间盘植入6具新鲜青壮年尸体标本的L4-5椎间隙,进行三维运动范围和压缩刚度测试,并与植入前和髓核切除后进行比较。结果:新型人工腰椎间盘植入后,腰椎节段的三维运动范围为前屈146°,后伸66°,左侧弯79°,右侧弯89°,左轴向旋转85°,右轴向旋转87°。其压缩刚度比髓核切除后高(P<005)。结论:新型人工腰椎间盘植入后既保证了腰椎节段的三维运动功能,又起到了稳定脊柱的功能。