Antibacterial activities of the leaf extracts of Eugenia uniflora Linn. (Synonym Stenocalyx michelli Linn.) Myrtaceae

The aqueous, organic, and volatile oil extracts of leaves of Eugenia uniflora Linn. Family Myrtaceae were investigated for antibacterial properties using agar dilution techniques. The aqueous extract was the most active against the organisms compared to the organic and volatile oil extracts. The extracts were found to inhibit Gram positive Staphylococcus aureus and Bacillus subtilis and Gram negative Escherichia coli and Shigella dysentcriae. Pseudomonas aeruginosa, Klebsiella pneumoniac, and Salmonella typhi were not inhibited.     

万福金安消毒剂对医院器械的消毒效果

目的观察万福金安消毒剂对医院不同科室器械的消毒效果。方法采用定量和定性杀菌试验方法。结果1500mg/L、2000mg/L有效氯溶液浸泡器械连续使用至第10天,对器械头上的枯草杆菌黑色变种芽胞杀灭率达到100%所作用的时间分别为40min和30min。口腔科、外科换药室、手术室连续使用含有效氯1500mg/L、2000mg/L的溶液浸泡器械,经定性培养有菌生长的时间分别是第6、8、10天和第10、10、14天。结论应用有效氯1500～2000mg/L万福金安溶液浸泡器械消毒时,对Ⅱ、Ⅲ类环境类别的科室使用时限分别为8～12d和4～8d。     

聚维酮碘杀灭微生物效果的试验观察

目的：观察聚维酮碘杀灭微生物效果.方法：采用定量杀菌试验方法对聚维酮碘消毒剂杀菌效果进行观察.结果：以有效碘含量为300mg/L的聚维酮碘溶液对布片上金黄色葡萄球菌和白色念珠菌作用7 min,平均杀灭率可达100.00%;对枯草芽孢杆菌黑色变种作用180 min,平均杀灭率均达99.65%以上.模拟现场试验结果证明,以有效碘含量为500mg/L聚维酮碘水溶液擦拭后作用20 min,对物体表面自然菌的杀灭率达93.24%以上.结论：聚维酮碘消毒液为强而有效的杀菌剂.     

含氯复方消毒剂杀灭微生物效果的试验观察

目的:了解含氯复方消毒剂杀菌效果、稳定性及腐蚀性。方法:应用载体定量杀菌试验与金属腐蚀性试验。结果:以含有效氯2000mg/L的该消毒剂对布片上枯草杆菌黑色变种芽孢作用20min,含有效30mg/L的该溶液对布片上金黄色葡萄球菌和大肠杆菌作用10min和3min,含有效氯20mg/L的该溶液对白色念珠菌作用10min,杀灭率均为100%。含有效氯1500mg/L的该消毒剂溶液对不锈钢片上乙型肝炎表面抗原作用30min,可将其抗原性破坏。含有效氯2000ml/L的消毒剂溶液对不锈钢无腐蚀,对铝、铜有轻度腐蚀,对碳钢有中度腐蚀。结论:含氯复方消毒剂具有高效杀菌作用,对金属有腐蚀性。     

臭氧·紫外线器械消毒柜消毒效果与影响因素的实验研究

目的探讨臭氧*紫外线消毒柜的机器性能和消毒效果与影响因素. 方法按卫生部<消毒技术规范>测定开机不同时间消毒柜中臭氧浓度、工作环境空气中臭氧浓度和消毒柜中臭氧残留浓度,以及消毒柜对不同微生物的杀灭效果. 结果按消毒柜自动程序开机20min柜内臭氧浓度达253.69mg/m3,柜中平均紫外线照射强度为1 862μW/cm2;消毒柜开机工作35min对不锈钢载体上金黄色葡萄球菌、大肠埃希菌、白色念珠菌杀灭率达100%;开机40min对不锈钢载体上枯草杆菌黑色变种芽胞杀灭率达100%,对染于手术剪和镊子上的金黄色葡萄球菌杀灭率达99.99%,消毒效果可靠而且安全. 结论肯格王牌臭氧*紫外线消毒柜容量大、自动、安全、消毒效果可靠、适用范围广泛的医疗器械消毒产品.     

产纤溶酶海洋枯草芽孢菌的液体发酵条件优化

目的采用响应面法对高产纤溶酶海洋菌株Y-6-A的液体发酵条件进行优化,以进一步提高产酶量并考察该法的有效性。方法先采用单因素实验考查各因素对菌株产酶的影响,并在此基础上利用PlackettBurman设计筛选到影响菌株产酶的主要因素,接着通过最陡爬坡实验逼近酶活最高区域,最后根据Box-Behnken中心组合实验设计对各显著因子进行优化。结果最终得到影响产酶的因素有4个:可溶性淀粉、黄豆粕粉、温度和转速,最佳发酵条件为:可溶性淀粉46.1g/L,黄豆粕粉23.3g/L,温度31.2℃,转速184r·min^-1,在此发酵条件下得到的酶活为3 606.23IU/mL,经3次验证实验测得的酶活稳定在3 580.32±14.82IU/mL,较优化前提高了22.4%,此外,实验值与预测值之间的相对误差为0.63%。结论响应面的优化结果比较理想,经优化后能较好提高酶活。     

Probiotic Therapy Reduces Periodontal Tissue Destruction and Improves the Intestinal Morphology in Rats With Ligature‐Induced Periodontitis

Background: With increase in the incidence of resistance to antibiotics, probiotics are emerging as a promising adjunctive periodontal therapy. The authors of this study evaluate the influence of probiotic (PROB) supplementation on ligature‐induced periodontitis (LIP) and intestinal morphology in rats. Methods: Thirty‐two rats were randomly divided into four groups: control (C), LIP, PROB, and LIP/PROB. In groups PROB and LIP/PROB, the PROB was administered orally by addition to the drinking water of the animals for 44 days. In groups LIP and LIP/PROB, the mandibular right first molar of the animals received a cotton ligature that was left in the same position for 14 days. All animals were euthanized 44 days after the start of the PROB supplementation. The jaws were resected and histomorphometric analyses were performed. The measurements included evaluation of attachment loss (AL) and alveolar bone level (ABL) on the distal root of the mandibular first molar. Samples of the duodenum, jejunum, and ileum were also dissected from each animal to evaluate the villous height (VH) and crypt depth (CD). The data obtained were subjected to statistical analyses (analysis of variance, Tukey; P <0.05). Results: Mean values of AL and ABL were significantly higher in group LIP compared with group LIP/PROB (AL: 3.05 ± 0.57 mm and 1.78 ± 0.63 mm, respectively; ABL: 4.21 ± 0.42 mm and 3.38 ± 0.17 mm, respectively). In group LIP/PROB, the mean values of VH and CD of the jejunum were significantly higher than the ones from group LIP (VH: 672.1 ± 83.3 µm and 528.0 ± 51.7 µm, respectively; CD: 463.8 ± 100.9 µm and 269.0 ± 48.4 µm, respectively). Conclusions: It can be concluded that PROB supplementation 1) reduces AL and alveolar bone loss in rats with LIP and 2) can protect the small intestine from reactive changes induced by LIP.     

过氧化氢与戊二醛对细菌芽胞协同杀灭作用的研究

试验表明，５０％过氧化氢与０５％戊二醛协同作用１０～３０ｍｉｎ，对枯草杆菌黑色变种芽胞的杀灭率远高于单以过氧化氢或戊二醛作用者。戊二醛浓度对复方杀菌效果影响较大，过氧化氢浓度者次之，溶液ｐＨ影响较小     

四种常用含氯消毒剂杀菌效果及部分性能的比较

为提高医院医疗器械的清洗和消毒质量,选择合适的化学消毒剂,采用载体定量杀菌试验对 4种常用含氯消毒剂的杀菌效果、稳定性进行了试验比较。结果,以含有效氯 500mg/L的 4种含氯消毒剂溶液对大肠杆菌、金黄色葡萄球菌、作用 15min,杀灭率均为 100%;对白色念珠菌,万福金安消毒剂和经纬三强消毒剂杀菌率达 100%;四环牌清洗消毒剂和 84消毒剂杀菌率分别为 99. 99%和 99. 98%。对不锈钢片、铝片、铜片、碳钢片万福金安基本无腐蚀作用,其它三种消毒剂均存在不同程度的腐蚀作用。     

二氧化氯杀菌效果影响因素的研究

为了解二氧化氯含量、作用时间、温度、有机物、溶液pH等因素对二氧化氯杀灭枯草杆菌黑色变种芽孢效果的影响,进行了载体定量杀菌试验。结果,含二氧化氯150mg/L溶液对亚麻布片上枯草杆菌黑色变种芽孢杀灭作用的浓度系数、D值、温度系数分别为:1.599、4.405 min、1.954。50％(ml/ml)小牛血清存在与否,该液作用 10 min的杀芽孢率分别为99.86％与 99.99％;在该液pH为3、5、7时,作用20min的杀芽孢率分别为99.97％、99.90％与99.67％。结果表明,该消毒液杀菌效果随二氧化氯含量增加、作用时间延长、温度升高而增强,酸性条件较好,有机物有一定影响。