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目的:研究牙髓血管的增龄性改变。方法:对42例10~70岁的正常牙髓组织进行AKPase组经染色,用形态计量学方法测量不同年龄组牙髓血管的长度,并据此计算出各年龄组的血管密度。结果:10~30岁组、31~50岁组和51~70岁组的血管密度分别为:27.95±6.40、15.68±6.23和11.51±4.20mm/mm3,各组数值有显著差异(P<0.01)。结论:牙髓血管密度随年龄增加而减小,从而表明牙髓组织的生理功能和代谢能力随年龄增加而下降。 相似文献
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关于血-输卵管腔屏障及血-输卵管伞腔屏障的实验形态学研究 总被引:1,自引:0,他引:1
本文用家兔和小鼠对雌性生殖管的屏障进行了研究。所得结果表明:①输卵管及输卵管伞存在血-输卵管腔及血-输卵管伞腔屏障;②其结构可能为固有膜和上皮下方的基膜以及上皮细胞间的紧密连接;③此屏障与血-卵屏障,血-子宫腔屏障和子宫-血屏障共同形成一个统一的微环境,它对排卵,卵细胞的受精和受精卵的继续发育,免受有害因子的影响,有着重要的生理意义。 相似文献
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口腔扁平苔藓(orallichenplanus,OLP)是一种原因未明的慢性炎症性疾病。关于OLP是否属于癌前损害,目前争议较多。本实验通过组化方法研究OLP上皮细胞中葡萄糖6磷酸脱氢酶(简称G6PDH)含量的变化,判断不同类型OLP的恶变能力。1 材料与方法11 一般资料 收集28例OLP活检标本。其中正常粘膜组织3例、颊粘膜OLP10例、舌粘膜OLP5例、牙龈OLP3例、唇部OLP7例。网纹型病变12例、斑块型7例、糜烂型6例。12 研究方法121 局麻下于病变边缘取材,立即投入2%… 相似文献
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卫生检验中样品测定结果的准确度和可比性取决于测定误差的大小 ,和检验方法检出限。样品测定结果一般有两种用途 ,一是测定结果与标准数值比较 ,一是两个相同指标测定结果比较。由于测定误差的存在 ,在应用该测定结果时 ,为使测定结果能反映样品中待测组分的真实含量 ,必须根据误差原理对测定结果进行统计计算[1] 。在用样品测定结果判断样品真实浓度时可产生如下影响 :(1)用样品测定结果 (R)来判断样品真实浓度 (C)是否小于某标准值 (L)时 ,如果测定结果有一系统负偏差 (B) ,就有如下情况 :R≤L ,R +B >L ,这会给人造成样品真实浓度 (… 相似文献
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阎丽华 《中国卫生检验杂志》2004,14(2):252-252
离子选择电极在卫生检验中已被广泛应用,其测定方法有多种,其中标准曲线法和标准增量法已被列入国家卫生标准检验方法中氟的测定[1 ] 。标准增量法的样品测定和标准测定是在试液离子强度、pH、温度、搅拌速度等基本相同的背景下进行的,该方法是一种方便、准确的测定方法。笔者根据本实验室应用标准增量法的体会,对该方法测定和计算过程中有关问题作粗浅的讨论。1 为保证测定结果的准确性样品和标准测定应在相同条件下进行标准增量法测定,由于样品的多样性和复杂性,特别在样品成份十分复杂时,离子强度缓冲溶液也很难保证样品试液和标准试液… 相似文献
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糖尿病性神经病变是1型糖尿病患者最常见、临床症状最复杂的并发症之一,但其在儿科患者中的发病率、患病率尚无定论.通常,糖尿病性神经病变分为末梢多发性神经病、单神经病、自主神经病和哑临床神经病.糖尿病患者早期良好的血糖控制将延缓神经系统损伤的进展.因此,儿童和青少年成为糖尿病性神经病变重要的一级预防对象.文章阐述了儿童和青少年患者1型糖尿病中糖尿病神经病变的流行病学趋势、发病机制、临床表现、检杏方法和治疗等情况. 相似文献
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Objective To evaluate the efficacy of adenovirus vector-mediated murine interleukin-10 (mIL-10) gene transfer to rat beta cell-RINm5F cells in vitro and to explore the potential value of gene therapy in type 1 diabetes mellitus. Methods The recombinant adenovirus vector Ad-mIL-10 was constructed and transfected into RINm5F cells (Ad-mIL-10 group). Untransfected RINm5F cells and Ad-eGFP-transfected cells were used as controls. The expression of mIL-10 was examined by RT-PCR and Western blot The levels of IL-10 in supernatant were measured by enzyme-linked immunosorbent assay (ELISA). For a determination of insulin release, the cells were cultured with high glucose ( 16. 7mmol/L) for a 1 -hour co-incubation. Then radioimmunoassay was used to detect the level of insulin in supernatant After induction of IL-1β, the levels of nitric oxide (NO) and nitric oxide synthase ( NOS) were measured, the apoptosis of transfected cells was detected by Hoechst 33258 staining and Fas expression by flow cytometry. Results Both mRNA and protein of Ad-mIL-10 were successfully expressed in RINm5F cells. Expression of mIL-10 gene resulted in significant increases in insulin secretion in response to high glucose. Compared with uninfected control and Ad-eGFP infected group, Ad-mIL-10 infected group had decreased levels of NO and NOS induced by IL-lβ [ NO level ( nmol/106 cells): 52. 9 ± 3. 2 vs 227. 3 ± 26. 4, 235. 1 ±28.6, both P<0.05; NOS level (U/106 cells): 9. 3 ±1.2 vs 29. 8 ±2.5, 30.5 ±2.8, both P < 0. 05]. Furthermore, Ad-mIL-10 gene transfer led to a profound reduction of Fas-expressing islet cells under the induction of IL-1β. Fas-expressing islet cells in Ad-mIL-10 group were significantly lower than those in uninfected group and Ad-eGFP-transfected group (24. 6% ± 1.0% vs 33. 3% ± 5. 1% , 32. 6% ±1.1%) (P<0.05).The apoptotic rates of Ad-mIL-10 group were lower in comparison with the other two groups (9.4%±1.1% vs 19.2%±2.2%,20.6%±2.3%,P<0.05).Conclusions IL-10 gene transfer to islet beta cells may be beneficial in maintaining beta cells function,protecting islet cells from IL-1β-mediated apoptosis and promoting islet cells survival.It is a potential therapy for type 1 diabetes mellitus. 相似文献