Effect of nano copper on visceral organs and the contents of trace elements in weanling pigs

We determine the effect of nano copper on visceral organs and contents of trace elements in organs and serum in weanling pigs. Our results showed that following supplementary concentration with 25, 50 and 200?mg/kg/day of nano copper, contents of copper shows trend of increasing in liver, kidney and intestinal; and ferrum shows gradually decreasing. The histopathological examination showed hemolysis, degeneration, nucleus pycnosis in liver, while renal tubular epithelial cell exfoliation and lymphocyte infiltration were found in kidney on supplementation of high concentration of nano-copper. Therefore, dietary supplementation of nano-copper 25?mg/kg b.wt could be a potential substitute for weaning piglets.     

多西紫杉醇纳米结构脂质载体中主药含量及包封率测定

目的:建立测定多西紫杉醇(DTM)纳米结构脂质载体(NLC)中主药含量及包封率的方法。方法:采用高效液相色谱法测定药物含量,色谱柱为DiamonsilTMODS,流动相为乙腈-水(55:45),流速为1.0mL.min-1,检测波长为228nm;分别采用超速离心法及超滤法分离DTX-NLC中游离药物以测定包封率。结果:DTM检测浓度的线性范围为0.024～2.4μg.mL-1(r=0.9996),平均回收率为99.29%(RSD=0.37%);2种方法所测药物的平均包封率均>96.5%。结论:本方法简便、准确、可靠,灵敏度高,可用于该制剂的质量控制。     

病床表面杀菌消毒的试验研究

患者手术后直接从手术台移至病床，这需要采取有效方法将病床经过消毒处理后方可直接进入手术室。试验研究表明，利用纳米光子技术产生臭氧，短时间内对病床表面自然菌的杀灭对数值为0.54-0．85，杀菌效果比较明显，且不附带产生任何二次污染，可以用于病床表面自然菌的杀灭处理。     

纳米左旋聚乳酸/聚己内酯复合骨髓基质源性软骨细胞修复犬膝关节软骨缺损

目的探讨纳米左旋聚乳酸/聚己内酯(纳米PLLA-b-PCL)复合骨髓基质源性软骨细胞修复犬膝关节软骨缺损的可行性。方法将纳米PLLA-b-PCL支架/骨髓基质源性软骨细胞复合物植入犬膝关节软骨缺损,其为实验组;另一组膝关节造成缺损后旷置,作为空白对照。术后12周,24周取材,行大体及组织学观察,组织学评分。结果术后12周、24周大体形态学和组织学观察均表明实验组得到较好修复,而对照组缺损未修复。结论骨髓基质细胞源性软骨细胞是修复关节软骨缺损较理想的种子细胞;纳米PLLA-b-PCL在新生软骨形成的同时,逐渐降解吸收,是组织工程修复关节软骨缺损的适宜支架材料,其具有良好的应用前景。     

纳米银烧烫伤贴在压疮治疗中的应用研究

目的:探讨纳米银烧烫伤贴在压疮治疗中的应用效果。方法:选取2008年5月至2011年10月本科收治的145例压疮患者,按照入院顺序随机分为观察组73例和对照组72例,两组患者采用不同的换药方法,对比治疗效果。结果:观察组总有效率(87.67%)高于对照组(72.22%),差异有统计学意义(P<0.05)。观察组治愈时间为(82.3±3.5)d,对照组治愈时间为(95.7±2.8)d,观察组明显短于对照组,差异有统计学意义(P<0.01)。结论:在常规治疗的基础上,使用纳米银烧烫伤贴治疗压疮疗效满意,方法简单,适合在临床推广应用。     

纳米紫杉醇联合顺铂化疗治疗晚期食管癌的效果分析

目的探讨纳米紫杉醇联合顺铂化疗治疗晚期食管癌的临床疗效及其安全性。方法选取我院2009年12月～2012年8月收治的晚期食管癌患者41例,将其随机分为观察组(20例)和对照组(21例),观察组采用纳米紫杉醇联合顺铂进行治疗,对照组采用5-氟尿嘧啶联合顺铂进行治疗,所有病例均化疗2个疗程以上,观察两组的临床治疗效果以及不良反应的发生情况。结果观察组和对照组的治疗总有效率分别为55%和38.1%,观察组的治疗有效率显著高于对照组(P<0.05),且观察组中位缓解时间和中位生存时间较对照组均显著延长(P<0.05);两组不良反应发生率的差异无统计学意义(P>0.05)。结论纳米紫杉醇联合顺铂治疗晚期食管癌的疗效优于5-氟尿嘧啶联合顺铂治疗,且不增加不良反应。     

Fe_3O_4磁纳米介导磁感应治疗Wistar大鼠Walker-256肿瘤

目的探讨Fe3O4磁性纳米微球磁感应对Wistar大鼠Walker-256肿瘤的治疗作用。方法荷瘤鼠随机分为NS组（注入生理盐水而不接受磁场处理）、MF组（注入磁流体而不接受磁场处理）、MFH1组（注入磁流体在交变磁场中治疗1次）、MFH2组（治疗2次）和MFH3组（治疗3次）,共5组。治疗温度控制在50～55℃,分别观察肿瘤体积抑制率和生存期,以及肿瘤的病理改变。结果MFH2组和MFH3组的肿瘤在2周内有明显的肿瘤体积抑制作用,肿瘤体积抑制率分别为（65.0±3.5）%、（71.6±4.2）%。与NS组（35.5±5.6）d比较,MFH3组（41.9±6.5）d和MFH2组（42.1±5.0）d的生存期延长,差异有统计学意义（q=4.386,P〈0.05;q=4.558,P〈0.05）;MFH1组（39.0±5.3）d和MF组（36.1±6.6）d的生存期差异无统计学意义（q=2.406,P〉0.05）。NS、MF组肿瘤表面光滑,小灶性坏死区;癌细胞密度大,核仁明显,易见核分裂相。MFH2和MFH3组瘤内大片坏死残留的无结构红染物质,或空洞,部分胞核有固缩、碎裂及崩解。结论Fe3O4纳米磁流体介导的磁热疗能抑制大鼠Walker-256皮下肿瘤增殖。     

纳米级和微米级二氧化硅粉尘对大鼠肺损伤的研究

目的：比较不同浓度纳米级与微米级二氧化硅粉尘对大鼠肺组织的损伤程度。方法：56只雄性W istar大鼠随机分为纳米级二氧化硅10.00 mg/100 g、15.00 mg/100 g、20.00 mg/100 g组,微米级二氧化硅10.00mg/100 g、15.00 mg/100 g、20.00 mg/100 g组和对照组;气管滴注二氧化硅粉尘10周后处死大鼠,观察肺组织损伤的程度。结果：纳米级、微米级二氧化硅组大鼠肺脏器系数均高于对照组,经检验差异有统计学意义（P〈0.05）,同剂量肺脏器系数比较纳米级大于微米级,差异有统计学意义（P〈0.05）;肺组织切片显示纳米级二氧化硅组肺泡排列紊乱、肺泡间隔增宽,其间有大量炎细胞浸润;微米级二氧化硅组肺组织有典型矽肺表现,肺大量纤维化、纤维细胞大量增生,可见明显矽结节。结论：微米级及纳米级二氧化硅对肺组织都有明显的损伤,损伤表现和程度不同。     

Expression of TGF-β in Region of Bone Defect Repaired by Collagen/Nano-beta-Tricalcium Phosphate Composite Artificial Bone

Bonerepairisaverycomplicatedprocessanditisinfluencedbymanyfactors,includingbonebed ,boneformingcellinthebonebedandlocalgrowthfactor Beta transforminggrowthfactor (TGF β)isaveryimportantbonegrowthfactorandplaysanimportantregulatoryroleinbone growingandremodeling SincetheadventofNanotechnology ,nanoceramicmaterialcanbesynthesizedmoreconveniently Somescholarshaveexperimentedbymakingcomparisonsbetweentheeffectsofhydroxapatite (HA )andnanoHAwithcollagen (Co)compoundtorepairbonedefectsinarabbit…     

Effect of nano-hydroxyapatite／collagen composite and bone morphogenetic protein-2 on lumbar intertransverse fusion in rabbits

Objective: To investigate the effect of nanohydroxyapatite/collagen (nHA/collagen) composite as a graft extender and enhancer when combined with recombinant human bone morphogenetic protein-2 (rhBMP-2) on lumbar intertransverse fusion in rabbits. Methods: Sixty-four adult female New Zealand white rabbits, aged 1 year and weighing 3.5-4.5kg, underwent similar posterolateral intertransverse process arthrodesis and were randomly divided into 4 groups based on different grafts: autogenous cancellous bone alone (ACB group), nHA/collagen alone ( HAC group ), half autogenous cancellous bone and half nHA/collagen (ACB HAC group) and nHA/collagen combined with rhBMP-2 (HAC BMP group ). The fusion masses were analyzed by manual palpation, radiography, biomechanical testing and histological examination. Results: Fusion was observed in 4 cases in the 6th week and in 5 cases in the 10tb week after surgery in ACB group. No case showed fusion in HAC group. In ACB HAC group, there was fusion in 3 cases in the 6th week and in 4 cases in the 10th week after surgery. In HAC BMP group, fusion in 1 case was found in the 4th week, in 5 cases in the 6th week and in 6 cases in the 10th week after surgery. It suggested that ACB, ACB HAC and HAC BMP groups showed similar fusion ratio and mechanical strength in the 6th and 10th week after surgery. According to the microstructure analysis of the samples, nHA/collagen had no negative effect when implanted together with ilium autograft. In HAC BMP group, new bone-like tissue was observed in the 2nd week postoperatively, and nearly all of the implanted composites were replaced by mature bone matrix and new bones in 10th week postoperatively. Conclusions：The nHA/collagen, especially combined with rhBMP-2, is a promising bone substitute, for it has quick biodegradation, fine bone-bending ability, and high osteoconductivity on posterolateral spinal fusion in rabbits.