复原髋臼窝在CroweⅢ型髋关节发育不良精准全髋置换中的作用及影像学量化评分

目的:探讨复原髋臼窝在CroweⅢ型髋关节发育不良(DDH)精准全髋置换中的作用,以及在标准骨盆X线平片上首次采用量化评分方法评价髋关节假体安装质量的可行性。方法:回顾性研究。纳入2014年3月—2019年4月蚌埠医学院第一附属医院行人工全髋关节置换术治疗的CroweⅢ型DDH终末期骨性关节炎患者86例(92髋),其中...     

Cell membrane-camouflaged PLGA biomimetic system for diverse biomedical application

The emerging cell membrane (CM)-camouflaged poly(lactide-co-glycolide) (PLGA) nanoparticles (NPs) (CM@PLGA NPs) have witnessed tremendous developments since coming to the limelight. Donning a novel membrane coat on traditional PLGA carriers enables combining the strengths of PLGA with cell-like behavior, including inherently interacting with the surrounding environment. Thereby, the in vivo defects of PLGA (such as drug leakage and poor specific distribution) can be overcome, its therapeutic potential can be amplified, and additional novel functions beyond drug delivery can be conferred. To elucidate the development and promote the clinical transformation of CM@PLGA NPs, the commonly used anucleate and eukaryotic CMs have been described first. Then, CM engineering strategies, such as genetic and nongenetic engineering methods and hybrid membrane technology, have been discussed. The reviewed CM engineering technologies are expected to enrich the functions of CM@PLGA for diverse therapeutic purposes. Third, this article highlights the therapeutic and diagnostic applications and action mechanisms of PLGA biomimetic systems for cancer, cardiovascular diseases, virus infection, and eye diseases. Finally, future expectations and challenges are spotlighted in the concept of translational medicine.     

Structure Characterization and Impact Effect of Al-Cu Graded Materials Prepared by Tape Casting

With the need of developing new materials, exploring new phenomenon, and discovering new mechanisms under extreme conditions, the response of materials to high-pressure compression attract more attention. However, the high-pressure state deviating from the Hugoniot line is difficult to realize by conventional experiments. Gas gun launching graded materials could reach the state. In our work, the corresponding Al-Cu composites and graded materials are prepared by tape casting and hot-pressing sintering. The microstructure and the acoustic impedance of the corresponding Al-Cu composites are analyzed to explain the impact behavior of Al-Cu graded materials. Computed tomographic testing and three-dimension surface profilometry machine results demonstrated well-graded structure and parallelism of the graded material. Al-Cu GMs with good parallelism are used to impact the Al-LiF target at 2.3 km/s using a two-stage light-gas gun, with an initial shock impact of 20.6 GPa and ramping until 27.2 GPa, deviating from the Hugoniot line.     

First-Principles Study on the Adsorption Behavior of O2 on the Surface of Plutonium Gallium System

To deeply understand the adsorption process of oxygen on the surface of a plutonium gallium system and to reveal the chemical reaction mechanism at the initial stage of oxidative corrosion on the surface of plutonium gallium alloy at a theoretical level, the adsorption behavior of oxygen molecules on the surface of a plutonium gallium system was investigated by a first-principles approach based on density flooding theory. The results show that the molecular bond length increases and finally breaks when the surface oxygen molecule is adsorbed on the surface of plutonium gallium system and dissociates into two atomic states. The most likely adsorption position of oxygen molecules on the surface of plutonium gallium system is hole-site vertical adsorption with the adsorption energy size of 10.7 eV. The bonding between oxygen atom and surface is mainly due to the overlapping hybridization of Pu-6s, Pu-7s, Pu-6d, Ga-3d and O-2p orbitals. Oxygen molecules mainly interact with the atoms of the first layer on the surface of the plutonium gallium system. The oxygen atoms after stable adsorption are able to diffuse to the subsurface of the plutonium gallium system after overcoming the energy barrier of 16.7 eV and form a stable structure. The research results reveal the initial reaction process and adsorption law of oxygen on the surface of plutonium gallium system from microscopic level, which is helpful to further explore the surface corrosion prevention technology of plutonium gallium system and improve the reliability and safety of plutonium gallium alloy components.     

基于指纹图谱分析和多成分同时定量的益安宁丸质量评价研究

摘 要 目的：建立益安宁丸的HPLC指纹图谱,并测定5种主要成分（人参皂苷Rg1、人参皂苷Rb1、三七皂苷R1、五味子酯甲和丹参酮ⅡA）的含量,为益安宁丸的质量控制提供可靠方法。 方法: 采用Waters Sunfire TM C18色谱柱（250 mm×4.6 mm,5 μm）,以乙腈（A） 0.1%磷酸水溶液（B）为流动相,梯度洗脱（0～5 min,2% A;5～15 min,2%A→10%A;15～25 min,10%A→30%A;25～40 min,30% A;40～60 min,30% A→90% A;60～70 min,90% A）;流速为1.0 ml·min-1;检测波长为203 min（0～60 min,检测人参皂苷Rg1、人参皂苷Rb1、三七皂苷R1和五味子酯甲）、270 nm（60～70 min,检测丹参酮ⅡA）;柱温35 ℃。 结果: 在指纹图谱研究中,共确定益安宁丸HPLC指纹图谱26个共有峰,通过与混合对照品比较指认其中7个指标成分,分别是6号 五味子酯甲、16号 人参皂苷Rg1、17号 人参皂苷Rb1、18号 三七皂苷R1、23号 丹参酮Ⅰ、24号 五味子甲素和26号 丹参酮ⅡA,利用相似度软件对14批样品指纹图谱进行分析,各批样品相似度均在0.98以上。在建立的色谱条件下试验5个成分分离度良好,方法精密度和重复性RSD值均＜1.5%,供试品溶液在24 h内稳定,各成分具有良好的线性关系和较宽线性范围;6批益安宁丸中人参皂苷Rg1、人参皂苷Rb1、三七皂苷R1、五味子酯甲和丹参酮ⅡA质量分数分别在7.187 0～7.254 0,9.086 0～9.250 0,2.109 0～2.288 0,11.208 0～11.338 0和1.374 0～1.458 0 mg·g-1。 结论: 所建立的益安宁丸HPLC指纹图谱检测和定量测定分析方法快速、准确,可以有效地评价益安宁丸的质量。     

抗生素西索米星发酵过程中次要组分的调控

在西索米星产生菌橄榄星孢小单孢菌Ｍ－４１的发酵代谢与产物合成的研究中,发现通过控制种子期菌丝的生长形态、培养基中磷酸盐含量,并在发酵过程中添加合适的抑制剂,可有效地减少发酵液中次要组分ｖｅｒｄａｍｉｃｉｎ的生物合成,增加主要组分西索米星的含量。     

Preparation of bovine serum albumin loaded poly (D,L-lactic-co-glycolic acid) microspheres by a modified phase separation technique

BSA-loaded mcirospheres were prepared by a modified phase separation method, in which petroleum ether (PE) containing a certain amount of Span 80 rather than poly (dimethylsiloxane) (PDMS) was adopted as coacervating agent. Process parameters such as Span 80 concentration, the volume and addition rate of coacervating agent, polymer concentration, agitation rate during the phase separation process and PE type were evaluated to optimize the protein encapsulation. It was found microspheres with high yield (>80.0%) and entrapment efficiency (>90%) could be obtained using PE containing 5.0% Span 80 as the coacervating agent. Microspheres with small particle size (<10?µm) could be produced successfully with appropriate process parameters. In vitro release study suggested that burst release was significantly influenced by Span 80 concentration, polymer concentration and PE type and the burst release could be reduced to <20% with optimized formulation. A biphasic release behavior in vitro test was observed for the microspheres prepared by this method. GC analysis demonstrated that residual solvent of DCM and petroleum ether was decreased dramatically in comparison with PDMS used as a conventional coacervating agent.     

加兰他敏治疗阿尔茨海默病作用机制的研究进展

阿尔茨海默病是老年性痴呆中最常见的一种类型。加兰他敏作为第二代乙酰胆碱酯酶抑制剂，原用于治疗重症肌无力和小儿麻痹后遗症等疾病，近年来被应用于临床治疗阿尔茨海默病．效果明显。本文就加兰他敏治疗阿尔茨海默病作用机制的最新研究情况作一简要概述。     

舒芬太尼联合地佐辛用于腹部手术术后自控静脉镇痛效果观察

目的:研究舒芬太尼联合地佐辛用于腹部手术术后自控静脉镇痛(PCIA)的效果。方法:110例接受腹部手术患者随机分为观察组和对照组各55例,术后均予电子镇痛泵进行PCIA。对照组给予地佐辛0.3 mg·kg-1,观察组给予舒芬太尼注射液0.1μg·kg-1+地佐辛0.3 mg·kg-1。比较两组患者VAS评分、药品不良反应、Ramesay评分、自控镇痛按压次数、排气时间、肠鸣音恢复时间、肠鸣音频率等指标,观察两组患者术后PCIA效果。结果:观察组的术后6~24 h VAS评分、Ramesay评分,12~24 h的自控镇痛按压次数等指标均明显优于对照组(P<0.01),排气时间、肠鸣音恢复时间、肠鸣音频率等也明显好于对照组(P<0.01)。观察组药品不良反应发生率明显高于对照组(P<0.05或0.01)。结论:舒芬太尼联合地佐辛用于腹部手术术后的PCIA,镇痛、镇静效果显著,能明显改善患者临床症状,值得临推广应用。