五味子油对链脲佐菌素诱导的2型糖尿病大鼠的影响

目的研究五味子油对链脲佐菌素诱导的2型糖尿病大鼠血糖、胰岛细胞形态及功能影响。方法高脂饲料联合2次ip小剂量链脲佐菌素(STZ)诱导建立2型糖尿病大鼠模型。糖尿病大鼠每天分别ig五味子油0.25、0.5、1.0 mg/kg,连续给药6周后检测大鼠空腹血糖、血清胰岛素水平;HE染色法观察大鼠胰腺病理形态学改变;免疫组织化学方法检测大鼠胰腺细胞胰岛素的表达;RT-PCR法检测大鼠胰腺组织胰岛素和胰十二指肠同源盒因子(PDX-1)mRNA表达水平。结果五味子油可显著降低糖尿病大鼠的血糖水平,其高剂量组可使血糖恢复至正常水平;提高胰岛素分泌水平,显著提高胰岛素敏感指数,改善胰岛素抵抗;可减轻糖尿病大鼠胰腺病理学改变,使变小的胰岛体积增大、胰岛β细胞数目增多、胰岛素表达提高;还可提高糖尿病大鼠胰腺组织胰岛素和PDX-1 mRNA表达水平。结论五味子油可以改善2型糖尿病大鼠胰岛素抵抗,减轻胰岛β细胞的损伤,增加β细胞数量,改善β细胞的功能缺陷,提高胰岛素的分泌量,增加胰岛素和PDX-1 mRNA表达,从而产生降血糖作用。     

亮蓝光成像与联动成像在早期食管癌内镜诊断中的应用价值

目的　评价亮蓝光成像（blue light imaging?bright,BLI?bright）和联动成像（linked color imaging,LCI）用于早期食管癌内镜诊断中的临床价值。方法　采用回顾性队列研究,以2018年5月—2020年8月在福建中医药大学附属福鼎医院行内镜黏膜下剥离术（endoscopic submucosal dissection,ESD）治疗,术前使用了蓝激光胃镜3种模式［BLI?bright、LCI和白光成像（white light imaging,WLI）］进行详细检查,且ESD术后病理证实为早期食管癌的63例连续病例作为观察对象。主观可视性分析由6名内镜医师完成,按年资分成高年资组和低年资组,每组各3名,主要观察指标为可视性评分（ranking score,RS）。客观色差分析主要比较3种模式下早期食管癌癌灶与周边黏膜的总色差（ΔE）,色差采用国际照明委员会的1976 L*a*b*系统。结果　6名研究者的RS总体评分WLI模式下为（2.57±0.81）分,明显低于LCI模式下的（3.25±0.67）分（t=9.71,P<0.001）和BLI?bright模式下的（3.18±0.67）分（t=9.31,P<0.001）。亚组分析发现：高年资组的RS评分WLI模式下为（2.71±0.80）分,明显低于LCI模式下的（3.33±0.66）分（t=7.16,P<0.001）和BLI?bright模式下的（3.42±0.62）分（t=8.09,P<0.001）;低年资组的RS评分WLI模式下为（2.40±0.90）分,亦明显低于LCI模式下的（3.15±0.83）分（t=9.62,P<0.001）和BLI?bright模式下的（2.89±0.92）分（t=5.69,P<0.001）,且LCI模式下评分还明显高于BLI?bright模式（t=4.07,P<0.001）。WLI模式下早期食管癌癌灶与周边黏膜的ΔE为11.52±3.40,明显低于LCI模式下的16.64±4.70（t=7.10,P<0.001）和BLI?bright模式下的15.72±3.84（t=7.88,P<0.001）。结论　与WLI模式相比,应用BLI?bright模式和LCI模式都能增加早期食管癌癌灶与周边黏膜的色差,提高早期食管癌可视性。其中,LCI模式更有利于低年资内镜医师检出早期食管癌。     

Predicting RNA secondary structure based on the class information and Hopfield network

One of the models for RNA secondary structure prediction is to view it as maximum independent set problem, which can be approximately solved by Hopfield network. However, when predicting native molecules, the model is not always accurate and the heuristic method of Hopfield network is not always stable. It is because that the class information is lost and the accuracy is not determined by the number of base pairs only. Secondary structures of non-coding RNAs are believed conservative on the same class. However, software and web servers nowadays for RNA secondary structure prediction do not consider the class information. In this paper, we involve class information in the initialization of Hopfield network. When the initialization is improved, the promising experimental result shows the efficacy and superiority of our proposed methods.     

Plasma fibrinogen beta-148C/T gene polymorphism in cerebral infarction patients

BACKGROUND： Plasma fibrinogen （Fg） β-148C/T gene polymorphism is a risk factor for ischemic angiopathy. OBJECTIVE： To explore the frequency distribution of Fg β- 148C/T gene polymorphism and its relationship with plasma Fg levels in patients with cerebral infarction. DESIGN, TIME AND SETTING： Case control experiment of gene polymorphism was performed at the Central Laboratory of Qingdao University Medical College from January 2003 to June 2004. PARTICIPANTS： A total of 88 patients with cerebral infarction were recruited from the Affiliated Hospital of Qingdao University Medical College, including 52 males and 36 females, averaging （61±14） years of age In addition, 80 healthy cases served as the control group, comprising 48 males and 32 females, with an average age of （58 ± 12） years. METHODS： Blood DNA was extracted, and electrophoresis results were observed using an ultraviolet single photon image system. The frequency distribution of Fg β -148C/T was analyzed by polymerase chain reaction-restriction fragment length polymorphism method. Plasma Fg levels were measured by cerebral infarction time. MAIN OUTCOME MEASURES： Plasma Fg β -148C/T gene polymorphism and plasma Fg levels in patients with cerebral infarction. RESULTS： The frequency of the T allele, and plasma Fg levels in CC, CT, and CC＋CT genotype subgroup, were significantly greater in the cerebral infraction group, compared with the control group （P 〈 0.05）. However, there was no significant difference between the TT genotype subgroup and the control group （P 〉 0.05）. The plasma Fg levels in the CT, TT, and CT＋TT genotype groups were significantly greater than the CC genotype group （P 〈 0.05）. However, in the control group, plasma Fg levels in the TT genotype subgroup were significantly greater than the remaining genotype subgroups （P 〈 0.05）. CONCLUSION： Plasma Fg β -148C/T gene polymorphism is an important hereditary factor for differences in plasma Fg levels. The T allele plays a crucial ro     

早期梅毒皮损组织CD3、CD20和CD68的表达

为探讨一，二期梅毒皮损组织细胞免疫应答过程及机制，采用免疫组织化学及计算机图像分析的探讨，对一，二期梅毒病损组织中的CD3，CD20，CD68表达进行定性定量分析研究。结果显示，43例一，二期梅毒标本中CD3，CD20，CD68表达均阳性，表达水平病期发展，皮肤损害加重而逐渐升高。CD68表达水平高于CD3，CD20，尤其在血管周围表达明显增高，CD20表达较低。研究表明，T细胞，B细胞，特别是巨噬细胞在清除早期梅毒组织内感染的梅毒螺旋体过程中起着重要的细胞免疫调节作用，但作用不完全。     

脑出血致应激性溃疡大鼠模型的建立

目的:观察大鼠自体尾静脉血建立尾状核脑出血致应激性溃疡实验动物模型的作用和效果。方法:SD大鼠分为对照组和实验组各10只。用非精确定位穿刺法将实验组大鼠自体尾静脉血200μL注入右脑实质内,72h后处死,观察胃黏膜溃疡发生率,溃疡指数,血清内皮素,血清、脑、胃黏膜的丙二醛(MDA)和超氧化物歧化酶(SOD),脑含水量,脑、胃黏膜光镜和电镜的病理变化及超微结构电脑图像定量分析。结果:实验组胃黏膜溃疡发生率为30%,溃疡指数为15,两组血清、脑、胃黏膜的MDA、SOD,脑神经元细胞、胃壁细胞超微结构电脑图像定量分析中的线粒体比表面差异均有统计学意义(P<0.01),脑含水量及胃壁细胞线粒体体积密度差异也有统计学意义(P<0.05)。血清内皮素差异没有统计学意义(P>0.05)。实验组脑、胃组织光镜可观察到组织坏死出血病灶,电镜见部分线粒体肿胀、嵴断裂,内质网稀疏或扩张。结论:200μL自体尾静脉血穿刺注入法可有效达到构建脑出血致应激性溃疡的目的。     

2015—2017年我国部分诊疗机构放射工作人员职业健康监测调查与分析

目的 分析2015-2017年我国部分放射诊疗机构放射工作人员的职业健康监测数据,为职业性放射性疾病的预防和控制提供科学依据。方法 通过"全国放射卫生信息平台-职业健康监测模块"采集近三年部分放射诊疗机构放射工作人员职业健康监测相关数据,并进行统计与分析。结果 2015-2017年监测医院放射工作人员个人剂量监测率分别为98.3%、98.9%、98.7%;职业健康检查率分别是95.5%、94.8%、95.7%。外周血淋巴细胞染色体畸变异常人员比例逐年降低分别为：0.9%、0.7%、0.3%;眼晶状体混浊率逐年降低分别为8.6%、7.7%、7.9%;甲状腺检查异常率逐年增加分别为18.8%、21.1%、22.1%。结论 总体上,我国放射诊疗机构放射工作人员的职业健康监护水平逐年提高,但眼晶状体和甲状腺的检查和防护仍需高度关注。     

Everyday reasoning abilities in persons with Parkinson's disease

Parkinson's disease (PD) patients develop progressive cognitive decline. The degree to which such decline impacts instrumental activities of daily living (IADL) among individuals in the early stages of PD without dementia is not well documented. The Everyday Cognitive Battery Reasoning subtest (ECB) was used to assess ability to solve everyday reasoning tasks for IADL among 19 non‐demented older adults with PD in comparison to 20 older adults without PD. The two groups were similar in age, education, race and gender. Individuals with PD had significantly lower scores (M = 61.98, SD = 12.03) than the comparison group (M = 69.80, SD = 9.48). Individuals with PD, who do not have dementia, may be more likely to experience difficulties in IADL requiring reasoning including medication use, finances, and nutrition. Even more serious implications lie in the capacity to make treatment choices. © 2010 Movement Disorder Society