Use of modified nucleotides and uracil-DNA glycosylase (UNG) for the control of contamination in the PCR-based amplification of RNA.

The inadvertent carryover of amplified fragments of nucleic acids (amplicons) is a potential source of contamination in the polymerase chain reaction. Recently, a method has been developed to generate amplicons with deoxyuracil triphosphate (dUTP) and to specifically hydrolyze these amplicons with uracil-DNA glycosylase (UNG) following the completion of the assay. We evaluated this system for the specific amplification of RNA from coxsackievirus A3 and B3. We found that RNA from both viruses could be amplified with dUTP, although the use of this triphosphate in place of TTP resulted in some loss of assay sensitivity. We also found that the dUTP-containing amplicons could be efficiently hydrolyzed by UNG, resulting in a 10,000,000-fold reduction in amplicon concentration with little effect on the native nucleic acid. The dUTP-UNG method has a great deal of potential for reducing amplicon contamination during the routine performance of nucleic acid amplification reactions.     

氧化作用与子宫内膜异位症

子宫内膜异位症是育龄妇女的常见疾病 ,近年来其发病率有上升趋势 ,研究认为EM发生发展与腹腔氧化作用有关。氧化作用是一种炎症反应 ,EM中巨噬细胞释放的氧化活性物 ,腹腔液中氧化低密度脂蛋白及其产物的增加 ,子宫内膜细胞氧化酶与抗氧化酶的异常表达 ,腹腔液中VitE的消耗 ,均说明EM与腹腔氧化作用有关。本文综述有关研究结果为用抗氧化剂和抗炎症制剂预防EM发生提供新的研究途径     

Good regulation of acupuncture in simple obesity patients with stomach-intestine excessive heat type

In order to investigate the regulatory effect of acupuncture on obesity patients with the Stomach-Intestine Excessive Heat Type, the pre-acupunctureal and post-acupunctural obesity index and biochemical indices of 718 simple obesity patients with Stomach-Intestine Excessive Heat Type were observed. It was showed that the marked weight loss effect was achieved in the cases by acupuncture, and the biochemical indices improved. It suggests that acupuncture had a optimal regulatory effect on the function of nerve, endocrine, digestion and energy metabolism.     

Relation between exposure to respirable silica dust and silicosis in a tungsten mine in China.

To estimate the quantitative relation between exposure to respirable silica dust and risk of an attack of silicosis, 1151 workers exposed to silica dust and employed from 1958 to 1987 in a tungsten mine in China were investigated. The results showed that the ratio of respirable silica dust concentration to total silica dust concentration was 0.529. Then, the total silica dust concentration in historical surveillance and monitoring data was converted to respirable silica dust concentration. The free silica content in respirable dust determined by x ray diffraction averaged 24.7%. Multiple logistic regression was used for the dichotomous dependent variables (presence or absence of silicosis). The independent variables in the multiple logistic regression with presence of silicosis as the dependent variable were age when first exposed, tuberculosis (presence or absence), and cumulative exposure to respirable silica dust. The partial regression coefficient of individual cumulative exposure was estimated as 0.079. It implied a positive association between exposure to respirable silica dust and risk of an attack of silicosis. The exposure limit for respirable silica dust was estimated as 0.24 mg/m3 under given conditions.     

疏可眠胶囊镇静作用的实验研究

且的:观察疏可眠胶囊对小鼠的镇静作用。方法:采用旷野活动法观察疏可眠胶囊不同给药剂量、给药时间对小鼠自主活动的量效、时效作用;对士的宁诱发惊厥小鼠的作用。结果:连续给药7d,疏可眠低中剂量(1g·k~(-1)、2g·kg~(-1))均能显著减少小鼠的自主活动;疏可眠高剂量(3g·kg~(-1))给药后1h～2h自主活动显著减少;给药后2h,呈现量效关系,随着剂量增加小鼠自主活动减少。各剂量组均可延长士的宁诱发小鼠惊厥出现的时间及死亡时间。结论:疏可眠胶囊具有减少小鼠自主活动和抗惊厥作用。     

内窥镜下治疗复发性腰椎间盘突出症

[目的]探讨对复发性腰突症患者行显微内窥镜下髓核切除术(microendoscopicdiscectomy,MED)治疗的可行性及有效性。[方法]19例有不同初次手术史,已明确诊断为复发性腰突症的患者接受MED手术。[结果]除1例术中改为开放式外,18例均在MED方式下完成手术。全部18例得到随访0.5～2.5a,平均随访1.5a。据Macnab评分,优为7例,良为9例,可为2例,差为0例,优良率88.89%。JOA评分由术前平均(9.61±3.40)分提高到末次随访时平均(26.17±2.60)分,有效率为86.32%。[结论]对于术前影像学上无明显腰椎不稳的复发性腰突症患者,只要遵循微创手术原则,掌握微创手术技巧,操作仔细,MED术也是治疗复发性腰突症较好的有效方法之一。     

糖尿病雄性大鼠性腺5α-还原酶Ⅱ型活性变化

目的 :探讨大鼠青春期和成年期糖尿病时性腺 5α 还原酶Ⅱ型的活性变化。　方法 :取 4 0d和 90d龄雄性Wistar大鼠各 30只 ,分别分为对照组 (C)、糖尿病组 (D)和胰岛素治疗糖尿病组 (ID)。采用薄层层析法测定各组附睾头、附睾尾、前列腺和睾丸组织内 5α 还原酶 Ⅱ型的活性。　结果 :①青春期大鼠性腺的各部位内 ,5α 还原酶 Ⅱ 型的活性D组均明显低于C组 (P <0 .0 1) ,而ID组明显高于D组 (P <0 .0 1) ;②成年期大鼠性腺的各部位内 ,5α 还原酶 Ⅱ型的活性在C、D和ID组各组间差异无显著性 (P均 >0 .0 5 )。　结论 :青春期大鼠性腺内 5α 还原酶 Ⅱ型的活性更易受代谢环境、激素水平及局部特异性因素的影响 ,而成年期大鼠性腺内 5α 还原酶Ⅱ 型的活性相对稳定     

重症急性胰腺炎合并深部真菌感染的治疗经验

为分析重症急性胰腺炎(SAP)合并深部真菌感染的临床特点、危险因素及预后,并探讨其防治的策略,回顾性分析85例SAP合并感染的临床资料,其中43例合并真菌感染,42例为单纯细菌感染。研究发现2组的年龄、性别、病因、ICU住院时间均无显著性差异;真菌感染组较细菌感染组APACHE Ⅱ评分及CT分级高,发生菌群紊乱、腹压增高及器官障碍的概率高、手术次数多,且均有显著性差异。真菌组的病死率约是细菌组的2倍多(44.19％比21.43％)。结果提示:合并真菌感染病死率明显增高;APACHE Ⅱ评分、CT分级、菌群紊乱、腹压增高、手术次数是真菌感染发生的危险因素;当发现不明原因的发热、意识改变及大出血时应怀疑合并真菌感染的可能;预防性抗真菌药物的应用可能有助于防治真菌感染。     

大鼠自体平滑肌细胞移植对心肌梗死后心功能恢复的作用

目的:研究自体平滑肌细胞移植到心肌梗死区后对心功能恢复的作用.方法:用酶消化法从SD大鼠的输精管中分离、提取自体平滑肌细胞,进行体外培养、扩增.移植组(n=12)将BrdU标记后的自体平滑肌细胞直接注射移植到左冠脉前降支结扎后2周形成的心肌梗死区瘢痕组织中;对照组(n=12)注射同等剂量的DMEM培养液.超声检查评估移植前和移植后4周的心功能状况.用免疫组化染色的方法,检测心肌瘢痕组织中是否有植入的平滑肌细胞存活以及促血管新生的情况.结果:移植的自体平滑肌细胞能在心肌梗死区内存活并形成肌样组织.与对照组比较,移植组左心室舒张末容积(LVEDV)明显减小[(0.78±0.16) vs (0.92±0.15) ml, P<0.01],左心室射血分数(LVEF)显著提高[(47.6±7.2)％ vs (29.3±6.1)％, P<0.01],心肌瘢痕组织血管新生明显[血管密度:(1.9±0.4)/(0.8 mm2) vs (0.4±0.2)/(0.8 mm2), P<0.01].结论:自体平滑肌细胞移植能防止心肌梗死后的心室腔扩大,促进梗死区血管新生,改善心功能.     

术中电生理检测在外周神经损伤中的应用

目的 探讨电生理检测在外周神经手术中应用的临床价值。方法 对16例17条外周神经分三组行术中电生理检测，指导术中决策和判断预后，并与术前肌电图结果或核磁共振检查结果对比。结果臂丛损伤组9例，术中体感诱发电位与核磁共振对检查完全根性损伤的检出率，经，检验差异无显著性。对臂丛损伤的大体定位，术前结合体格检查、肌电图及核磁共振结果的诊断与术中电生理检测结果完全吻合。四肢外周神经损伤组5条神经，3条术前肌电图结果与术中检测完全相符，2条不符。神经肿物组3条神经，在摘除神经瘤体后，术中电生理检测提示1例好转，2例出现不同程度的神经受损改变，术后随访与术中电生理检测的提示相符。在本组所有17条神经中，共有5条神经因术中电生理检测结果而改变了手术方案。结论 外周神经术中电生理检测的准确性优于术前的肌电图检查及核磁共振检查，具有准确、简便、实时等特点，可直接指导术中手术方案的选择；对神经肿块等原因引起的神经压迫损害，术中电生理检测可评价手术疗效，判断预后。