雏鸡耳蜗中的一氧化氮合成酶分布

应用冰冻切片组织化学技术，以还原型尼克酰胺腺嘌呤二核苷酸磷酸-黄递酶特异性地确定一氧化氮合成酶（NOS）在小鸡耳蜗中存在，观察其分布情况，发现听毛细胞底部颗粒较集中，染色深，毛细胞周围亦有散在颗粒，基底乳头近端与远端染色强弱相似。阳性反应神经纤维连接毛细胞底部。螺旋神经节细胞胞浆中有大量的蓝色颗粒，细胞核无着色，这些细胞大小均匀，呈圆形或椭圆形，周围有多量阳性神经纤维，提示可能为神经性NOS。血管盖内皮细胞胞浆中酶活性较强。对这些分布特点和意义进行了讨论。     

能谱CT多参数成像评估胆结石成分的应用价值

目的 探究能谱CT多参数成像评估胆固醇结石和非胆固醇结石的应用价值.方法 收集125枚胆结石置入猪肝模型中行CT能谱模式扫描,并重建普通螺旋CT图像,测量所有胆结石单能量40 keV、100 keV时的CT值(HU40 keV、HU100 keV)、有效原子序数(Eff-Z)和普通螺旋CT值(HU120 kVp lik...     

炮制对甘遂、牛膝、苦杏仁特殊毒性及药效的影响

炮制前后毒理学研究表明,经炮制可降低甘遂、牛膝、苦杏仁对EB病毒早期抗原的激活作用,降低甘遂的皮肤刺激作用、二阶段皮肤肿瘤促进作用及峻泻作用。减毒同时可保留药效或增效。     

INTRABEAM实施乳腺癌术中放疗系统临床应用观察(附20例报告)

目的:评价INTRABEAM术中放射治疗系统临床应用的安全性和优势.方法:INTRABEAM对20例保乳手术患者实施术中瘤床放疗,均为单次照射每次20Gy,施用器规格为4.5cm(范围1.5-5.0cm),治疗持续时间35.5-51分钟.结果:术中照射治疗后有3例发生治疗区局部积液,经抽吸并加压包扎后愈合,乳房水肿1例.结论:INTRABEAM术中放射治疗系统近期无明显毒副作用,INTRABEAM术中放射治疗系统是一项安全良好耐受性技术,病人乐于接受.     

Inhibiting DNA methylation alleviates cisplatin-induced hearing loss by decreasing oxidative stress-induced mitochondria-dependent apoptosis via the LRP1–PI3K/AKT pathway

Cisplatin-related ototoxicity is a critical side effect of chemotherapy and can lead to irreversible hearing loss. This study aimed to assess the potential effect of the DNA methyltransferase (DNMT) inhibitor RG108 on cisplatin-induced ototoxicity. Immunohistochemistry, apoptosis assay, and auditory brainstem response (ABR) were employed to determine the impacts of RG108 on cisplatin-induced injury in murine hair cells (HCs) and spiral ganglion neurons (SGNs). Rhodamine 123 and TMRM were utilized for mitochondrial membrane potential (MMP) assessment. Reactive oxygen species (ROS) amounts were evaluated by Cellrox green and Mitosox-red probes. Mitochondrial respiratory function evaluation was performed by determining oxygen consumption rates (OCRs). The results showed that RG108 can markedly reduce cisplatin induced damage in HCs and SGNs, and alleviate apoptotic rate by protecting mitochondrial function through preventing ROS accumulation. Furthermore, RG108 upregulated BCL-2 and downregulated APAF1, BAX, and BAD in HEI-OC1 cells, and triggered the PI3K/AKT pathway. Decreased expression of low-density lipoprotein receptor-related protein 1 (LRP1) and high methylation of the LRP1 promoter were observed after cisplatin treatment. RG108 treatment can increase LRP1 expression and decrease LRP1 promoter methylation. In conclusion, RG108 might represent a new potential agent for preventing hearing loss induced by cisplatin via activating the LRP1-PI3K/AKT pathway.KEY WORDS: Cisplatin, DNMT, Apoptosis, Hair cell, Spiral ganglion neurons, RG108, Mitochondrial dysfunction, ROS     

Colorectal cancer screening for the natural population of Beijing with sequential fecal occult blood test: a multicenter study

Objective To assess the prevalence of colorectal cancer(CRC)in Beijing and the reliability or the sequential fecal occult blood test(SFOBT)for CRC screening.Methods Of the natural population(48 100 persons)in several Beijing communities,we screened 26 827 persone with age over 30 using the SFOBT screening program,Guaiacum Fecal Occult Blood Test(GFOBT),lmmuno Fecal Occult Blood Test(IFOBT),and colonoscopies.Results The screening rate of the population was 74%.The positive rate of SFOBT was 5.6%.The prevalence of CRC in the entire population of Beijing was therefore calculated to be 36.57/10^5.Of 12 CRC detected patients,4 cases were in stage DukesA (33.33%),7 cases in stage Dukes B(58.33%),only 1 case(8.34%)in stage Dukes C.Conclusions The prevalence of CRC in Beijing is one of the highest in China,Individuals at high risk for CRC or those over 50 years of age should be considered as primary candidates for screening,SFOBT screening is a cost-effective and reliable method for early detection of CRC.     

早期诊断宫颈上皮内病变及宫颈鳞癌的标记物--Ki-67

目的：探讨宫颈上皮内病变及宫颈鳞癌的标记物--Ki-67的表达及意义。方法：应用免疫组化S-P法检测14例宫颈鳞癌、77例宫颈上皮内病变、23例正常宫颈组织中Ki-67的表达水平，并加以分析。结果：①Ki-67阳性表达率在宫颈鳞癌中最高（100%），宫颈上皮内病变次之（93.33%～100%），正常宫颈组最低（39.13%）。宫颈上皮内病变及宫颈鳞癌与正常组比较，差异有统计学意义（P〈0.01）。②从正常宫颈组织、宫颈上皮内病变到宫颈鳞癌，Ki-67的表达强度逐渐增强，两者呈正相关（r=0.7708）。结论：Ki-67参与宫颈上皮内病变、宫颈鳞癌的发生。作为早期诊断宫颈上皮内病变及宫颈鳞癌的标记物，Ki-67的检测可提高宫颈鳞癌的早期诊断率。     

慢性乙肝患者HBV-DNA载量与超敏C反应蛋白及丙氨酸氨基转移酶水平的相关性分析

目的探讨慢性乙型肝炎（CHB）患者血清中HBV-DNA载量与超敏C反应蛋白（hs-CRP）及ALT水平的相关性。方法对141例慢性乙肝患者的血清采用荧光定量聚合酶链反应（FQ-PCR）检测HBV-DNA载量,免疫透射比浊法及酶速率法分别测定血清hs-CRP和ALT的水平。结果 CHB患者hs-CRP及ALT水平显著高于正常对照组（P均〈0.01）,且随肝损害程度的加重而升高（P〈0.01或P〈0.05）;不同HBV载量组间ALT及hs-CRP水平比较,差异均无统计学意义（P〉0.05）。hs-CRP及ALT水平变化与HBV-DNA载量均无相关性（r=0.137,r=0.211,P〉0.05）。结论多数CHB患者具有不同程度炎症反应,但其炎症程度与乙肝病毒复制程度无关。     

The elevated expression of osteopontin and NF-κB in human aortic aneurysms and its implication

The expression and significance of osteopontin (OPN) and NF-κB in patients with thoracic aortic aneurysm (TAA) and abdominal aortic aneurysm (AAA) were investigated.Thirteen TAA specimens,20 AAA specim...     

智能代理在网络课程监控中的应用模式研究

网络课程作为终身教育学习资源的一种,越来越受到人们的重视.在网络课程中,是否具备良好的监控能力,是影响学习者学习效果的关键因素.而目前的网络监控普遍存在智能程度不高问题,无法满足网络监控的需要.该文将智能代理技术与电子学档结合起来对网络课程进行监控,以期对今后网络课程监控方面的研究提供一些帮助.