生物材料聚酰胺-胺树状大分子合成及其体外细胞相容性评价

主要通过Michael加成和酰胺化逐步迭代合成反应得到聚酰胺-胺（PAMAM）树状大分子并对合成产物进行了结构表征。对生物医学有潜在应用价值的第五代（G5．0）提出了廉价易行的合成提纯步骤并通过细胞计数、MTF检测和FCM对L-929细胞系进行了体外生物相容性评价分析。结果表明，按照本试验的合成及纯化所得PAMAM G5．0对L-929细胞系在给药范围内无细胞毒性，无致瘤性，有良好的细胞相容性。     

Surface-Attached Polymer Networks Made from Cationic Poly(diitaconates): Synthesis,Surface Characterization,and Bioactivity

Facially amphiphilic polymers carrying cationic and hydrophobic groups on the same repeat unit have shown promising antimicrobial activity and biocompatibility, yet they are prone to suffer from protein adhesion which may induce biofilm formation. To overcome this problem, poly(diitaconate)-based copolymers with cationic/hydrophobic and protein-repellent/charge-neutral repeat units are synthesized. The bioactivity profile of surface-attached polymer networks made from these copolymers depends on the ratio of the cationic and charge-neutral repeat units. In all cases, the protein adhesion is substantially reduced compared to purely cationic polymers. At a 50:50 ratio, the polymer coatings are partially protein-repellent and antimicrobial, yet slightly cell toxic. At an intermediate composition of 30:70, they are still antimicrobial and the cell compatibility is substantially improved. The long-term stability of these materials still has to be determined to judge their suitability for medical applications.     

Experimental analysis of the human perception threshold of a DC electric field

To study the biological effects of extremely low frequency (ELF) electric fields, a fundamental study is conducted of the human perception threshold of an electric field. The perception threshold is measured with human subjects, and the results are analysed. It is clear that field perception is based on the movement of hair and not on other sensations. Variance in the perception threshold and its causes are investigated. The perception threshold decreases by almost 30% as the relative humidity increases from 50 to 90%. The perception threshold is also dependent on the physical condition (length and density) of the hair and the psychological condition (degree of awareness) of the subject. The dependence on these is much smaller than that on relative humidity. The cause of the gender difference in the threshold is ascribed to the difference in the physical condition of the hair. Through this study, some factors to be taken into account for the safety standard are made clear.     

葛根芩连汤不同配伍对黄芩苷含量的影响

目的　建立 RP- HPL C法测定葛根芩连汤各配伍组合中的黄芩苷的含量测定方法 ,研究配伍对黄芩苷含量的影响。方法　采用 L8(2 7)正交设计及统计方法 (统计软件 SPSS10 .0 ) ,以 HPL C法测定黄芩苷的含量。结果　葛根、黄连对方中黄芩苷含量的影响差异具有显著性 (P<0 .0 5 ) ,甘草对黄芩苷含量的影响差异无显著性 (P>0 .0 5 ) ,葛根、黄连、甘草对黄芩苷含量的影响不存在两两交互作用。凡是黄连与黄芩的配伍组合皆有沉淀产生 ,并且沉淀中含有较多的黄芩苷。结论　葛根芩连汤配伍中葛根、黄连能降低黄芩苷的含量 ,甘草没有增加黄芩苷的溶出的作用。 p H值的改变可能是含黄连和黄芩配伍煎液产生沉淀的主要原因之一。     

苓桂术甘汤配伍机制及药效物质基础研究

目的：研究《伤寒论》名方苓桂术甘汤（茯苓，桂枝，白术，甘草）的配伍机制及药效物质基础。确定方中各药味的君臣佐使关系和质量控制指标。方法：采用正交试验设计对方中组成药味进行药味与药量同时加减拆方。选择小鼠常压耐缺氧，对抗氯仿所致小鼠心律失常和利尿三项药理指标对所得16个处方进行药理实验；采用方差分析，逐步回归分析（SREG）与典型相关分析（CCOR）将所得药理数据和组方药味及药理相关联，探讨复方苓桂术甘汤的配伍机制；同时对各处方进行HPLC色谱指纹图谱研究。将所得药理数据和各指纹峰的峰面积（即各化合物的含量）相关联，探讨复方苓桂术甘汤的药效物质基础。并确定其质量控制指标。结果：确定了方中以茯苓为君。以桂枝为臣，佐以白术，使以甘草的配伍关系，与对该复方中药的传统诠释相一致；通过回归分析和相关分析从50个色谱峰中选取17个作为药效物质基础，其中桂皮酸，甘草酸和去氢土莫酸被确定为质量控制指标。结论：本研究为探讨复方中药的药效物质基础提供了有意义的尝试。     

丹参注射液与黄芪注射液在5%葡萄糖注射液中的配伍稳定性观察

目的：研究丹参注射液与黄芪注射液在5％葡萄糖注射液中配伍的稳定性，为临床配伍使用提供依据。方法：在不同温度(10、25和37℃)条件下，在6小时内不同时间观察配伍液的外观、pH值、不溶性微粒的变化，并用紫外分光光度法观察配伍液的图谱变化，测定混合液中两种注射液主要成分的浓度。结果：丹参注射液与黄芪注射液在5％葡萄糖注射液中配伍后，外观、pH值、不溶性微粒、紫外吸收图谱、主要成分含量基本不变。结论：两种注射液可以在5％葡萄糖注射液中配伍使用。     

盐酸乌拉地尔(利喜定)注射液与临床常用5种药物的配伍稳定性考察

目的 :考察盐酸乌拉地尔注射液分别与氯化钾、门冬氨酸钾镁、碳酸氢钠、维生素C、盐酸利多卡因5种注射液的配伍稳定性。方法 :采用紫外分光光度法考察各配伍液在室温条件下 (15℃～25℃ )配伍0h～8h内吸收度、吸收曲线变化 ,测定 pH值 ,同时观察其外观和普通显微镜下的变化。结果 :盐酸乌拉地尔注射液在10 %葡萄糖输液中分别与以上5种注射液混合配伍后 ,pH值、外观、普通显微镜下及紫外吸收光谱各项检查均无变化。结论 :盐酸乌拉地尔注射液分别与以上5种注射液配伍稳定。     

Engineering analysis of diamond-like carbon coated polymeric materials for biomedical applications

Diamond-like carbon (DLC) films have received much attention recently owing to their properties, which are similar to diamond: hardness, thermal conductivity, corrosion resistance against chemicals, abrasion resistance, good biocompatibility, and uniform flat surface. Furthermore, DLC films can be deposited easily on many substrates for wide area coat at room temperature. DLC films were developed for applications as biomedical materials in blood contacting-devices (e.g., rotary blood pump) and showed good biocompatibility for these applications. In this study, we investigated the surface roughness by Atomic Force Microscopy (AFM) and Hi-vision camera, SEM for surface imaging. The DLC films were produced by radio frequency glow discharge plasma decomposed of hydrocarbon gas at room temperature and low pressure (53 Pa) on several kinds of polycarbonate substrates. For the evaluation of the relation between deposition rate and platelet adhesion that we investigated in a previous study, DLC films were deposited at the same methane pressure for several deposition times, and film thickness was investigated. In addition, the deposition rate of DLC films on polymeric substrates is similar to the deposition rate of those deposited on Si substrates. There were no significant differences in substrates' surface roughness that were coated by DLC films in different deposition rates (16-40 nm). The surface energy and the contact angle of the DLC films were investigated. The chemical bond of DLC films also was evaluated. The evaluation of surface properties by many methods and measurements and the relationship between the platelet adhesion and film thickness is discussed. Finally, the presented DLC films appear to be promising candidates for biomedical applications and merit investigation.     

从药对的角度考察复方配伍规律

复方的配伍规律是中药方剂理论的核心问题，也是国家自然科学基金近年连续资助的重点方向之一。本文从复方中特定的两味药的配伍形式——药对出发，阐述药对的概念、特点及其在复方配伍规律研究中的作用、优势和意义。作者认为：药对配伍的研究是复方配伍规律研究的基础和重要切入点之一。     

配伍对葛根芩连汤中小檗碱含量的影响

目的　建立 HPL C法测定葛根芩连汤各配伍煎液中小檗碱的含量测定方法 ,研究配伍对小檗碱含量的影响。方法　采用 L8(2 7)正交设计及统计软件 SPSS10 .0统计方法 ,以 HPL C法测定小檗碱的含量。结果　葛根、黄芩、甘草对方中小檗碱含量的影响差异存在显著性 (P<0 .0 5 ) ,葛根与黄芩、黄芩与甘草、葛根与甘草对小檗碱的含量影响交互作用不显著。实验中观察到凡是黄连与葛根、黄芩、甘草的配伍组皆有沉淀产生 ,沉淀中含有一定量的小檗碱。结论　葛根、黄芩、甘草降低小檗碱的含量。