3 research outputs found

    纳米硒联合聚维酮碘对手术感染杀菌的效果

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    目的负载多功能纳米硒聚维酮碘(PVP-I@Se)消毒剂对金黄色葡萄球菌(SA)、耐甲氧西林金黄色葡萄球菌(MRSA)的杀菌效果,为皮肤手术部位消毒提供实验依据。方法实验分为PVP-I组(对照组)与PVP-I@Se组(实验组),两组的碘浓度梯度相同,分别为50、75、100、200和400 μg/mL,实验组硒浓度2 μg/mL,对照组不添加硒,比较两组不同的消毒液对SA、MRSA的消毒效果,检测指标包括最低抑菌浓度(MIC)和最低杀菌浓度(MBC);碘浓度50 μg/mL时的最短杀菌时间;碘浓度200 μg/mL、400 μg/mL时的抑菌圈大小。结果对照组对SA、MRSA的MIC均为79.17 μg/mL、实验组分别为54.17和70.83 μg/mL。而对照组对SA、MRSA的MBC分别为129.17和150.00 μg/mL,实验组分别为70.83和87.50 μg/mL。碘浓度50 μg/mL时,对照组对SA、MRSA的最短杀菌时间为130 s、140 s,实验组分别为65 s、75 s。碘浓度200 μg/mL时,对照组对SA、MRSA的抑菌圈直径分别为7.67 mm、8.33 mm,实验组均为9.50 mm。碘浓度400 μg/mL时,对照组对SA、MRSA的抑菌圈直径分别为9.00 mm、9.33 mm,实验组分别为11.67 mm、12.00 mm。结论在聚维酮碘浓度为50、75、100、200和400 μg/mL时,分别加入浓度为2 μg/mL的硒,可增强其对SA、MRSA的杀菌效果、缩短作用时间。硒(SeNPs)加入PVP-I对SA、MRSA 的杀菌效果均有增效作用。但增敏效果SA较MRSA显著。MRSA的增效作用对碘浓度(400 μg/mL)需求较高。为临床精准选用消毒剂的浓度和作用时间,降低临床皮肤手术部位感染提供理论依据

    安尔碘Ⅲ型消毒剂对眼表泪膜功能的影响

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    【目的】探讨常规浓度(5g/L)、常规作用时间(3min)下安尔碘Ⅲ型消毒剂术前结膜囊冲洗的消毒效果,及对眼表泪膜功能和结膜杯状细胞的影响,为内眼手术术前结膜囊消毒液的安全性及有效性提供临床依据。【方法】收集白内障超声乳化联合人工晶体植入手术患者30人30只患眼作为研究对象,比较安尔碘Ⅲ型消毒剂常规结膜囊冲洗前及冲洗后的结膜囊分泌物细菌培养情况;术前1d、术后7和30d进行Schirmer试验;眼表分析仪检测泪膜破裂(首次及平均)时间、泪河高度;共聚焦显微镜观察结膜杯状细胞的密度。【结果】冲洗前结膜囊分泌物细菌培养阳性3例、冲洗后无阳性检出,前后检出差异无统计学意义;术后7、30d的泪液分泌与术前1d比较差异无统计学意义;术后7、30d的泪河高度与术前1d比较差异无统计学意义;术前1d与术后7d的首次泪膜破裂时间比较差异有统计学意义(P<0.05)、与术后30d的比较差异无统计学意义;术前1d与术后7d的平均泪膜破裂比较差异有统计学意义(P<0.05)、与术后30d的比较差异无统计学意义;术前1d与术后7d的结膜杯状细胞密度比较差异有统计学意义(P<0.05)、与术后30d的比较差异无统计学意义。【结论】安尔碘Ⅲ型消毒剂结膜囊冲洗可清除结膜囊的细菌;术后7d内由于结膜杯状细胞密度减少对泪膜的稳定性有一定影响,术后30d结膜杯状细胞密度恢复至术前水平,眼表泪膜功能恢复正常

    Prediction of Energy Resolution in the JUNO Experiment

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    International audienceThis paper presents the energy resolution study in the JUNO experiment, incorporating the latest knowledge acquired during the detector construction phase. The determination of neutrino mass ordering in JUNO requires an exceptional energy resolution better than 3% at 1 MeV. To achieve this ambitious goal, significant efforts have been undertaken in the design and production of the key components of the JUNO detector. Various factors affecting the detection of inverse beta decay signals have an impact on the energy resolution, extending beyond the statistical fluctuations of the detected number of photons, such as the properties of liquid scintillator, performance of photomultiplier tubes, and the energy reconstruction algorithm. To account for these effects, a full JUNO simulation and reconstruction approach is employed. This enables the modeling of all relevant effects and the evaluation of associated inputs to accurately estimate the energy resolution. The study reveals an energy resolution of 2.95% at 1 MeV. Furthermore, the study assesses the contribution of major effects to the overall energy resolution budget. This analysis serves as a reference for interpreting future measurements of energy resolution during JUNO data taking. Moreover, it provides a guideline in comprehending the energy resolution characteristics of liquid scintillator-based detectors
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