抗癫痫复方对遗传性震颤大鼠癫痫小发作的影响

目的:观察复方中药(天麻、蜈蚣、僵蚕、制南星)水煎剂对震颤大鼠癫痫小发作的影响。方法:震颤大鼠脑海马和皮质慢性安插电极,连续记录灌胃给药前及给药不同时间后的脑电图。结果:抗癫痫复方能明显抑制震颤大鼠平均每次癫痫小发作的持续时间和总发作时间。结论:抗癫痫复方具有明显的对抗震颤大鼠癫痫小发作的作用,给药后60min的作用最强。     

参芪复方对GK大鼠早期动脉硬化胰岛素抵抗的影响

目的:观察参芪复方对GK大鼠2型糖尿病早期动脉硬化胰岛素抵抗的影响.方法:SPF级GK大鼠(自发性糖尿病大鼠)44只及Wistar大鼠11只按血糖水平随机分为正常对照组、模型组、雷米普利组、参芪复方低剂量组、参芪复方高剂量组.4组GK大鼠组造模:10 mg·kg-1·d-1腹腔注射N-硝基-L-精氨酸甲酯(L-NAME),同时给高脂饮食,连续14 d造模.正常对照组给生理盐水.2周后开始给药,各组分别给相应受试药物28 d.用放免法测IL-6、INS,计算IAI、IRI,光镜下观察胸主动脉内膜病变的数目和程度.结果:参芪复方高、低剂量组的血清IL-6、INS含量较模型组下降,IRI明显降低(P＜0.01),IAI明显升高,胸主动脉内膜病变数目与程度均有明显减少(P＜0.01).结论:以益气养阴、清热生津、活血化瘀为治则的参芪复方能明显下调GK大鼠内皮细胞损伤的周围血的IL-6及INS的表达,降低IRI,升高IAI,减少胸主动脉内膜病变的数目和程度,在一定程度上保护了胰岛庀赴墓δ芎脱a管内皮细胞,防止动脉粥样硬化的发生和发展.     

Cell cycle perturbations and apoptosis induced by isohomohalichondrin B (IHB), a natural marine compound

Isohomohalichondrin B (IHB), a novel marine compound with anti-tumoral activity, extracted from the Lissodendorix sponge, inhibits GTP binding to tubulin, preventing microtubule assembly. Cell cycle perturbations and apoptosis induced by IHB were investigated on selected human cancer cell lines by using flow cytometric and biochemical techniques. Monoparameter flow cytometric analysis showed that 1 h IHB exposure caused a delayed progression through S-phase, a dramatic block in G₂M phase of the cell cycle and the appearance of tetraploid cell population in LoVo, LoVo/DX, MOLT-4 and K562 cells. At 24 h after IHB exposure, the majority of cells blocked in G₂M were in prophase as assessed by morphological analysis and by the fact that they expressed high levels of cyclin A/cdc2 and cyclin B1/cdc2. At 48 h, all cells were tetraploid as assessed by biparameter cyclin A/DNA and cyclin B1/DNA content analysis. Apoptotic death was detected in both leukaemic MOLT-4 and K562 cells, which express wild-type and mutated p53 respectively, when the cells were blocked in mitotic prophase. In conclusion, IHB is a novel potent anti-tumour drug that causes delayed S-phase progression, mitotic block, tetraploidy and apoptosis in cancer cell lines. © 1999 Cancer Research Campaign     

中药复方治疗泌尿系结石用药规律探讨

为研究中药复方治疗泌尿系结石的用药规律,收集整理近年来文献报道中治疗泌尿系结石的中药复方148首,统计分析发现在所使用的123种中药中,以淡渗利水、补阴、活血破血、行气及补益类中药为主,符合中医理论对泌尿系结石病因病机的认识。     

Occurrence,integrity and functionality of AcaML1–like viruses infecting extreme acidophiles of the Acidithiobacillus species complex

General knowledge on the diversity and biology of microbial viruses infecting bacterial hosts from extreme acidic environments lags behind most other econiches. In this study, we analyse the AcaML1 virus occurrence in the taxon, its genetic composition and infective behaviour under standard acidic and SOS-inducing conditions to assess its integrity and functionality. Occurrence analysis in sequenced acidithiobacilli showed that AcaML1-like proviruses are confined to the mesothermophiles Acidithiobacillus caldus and Thermithiobacillus tepidarius. Among A. caldus strains and isolates this provirus had a modest prevalence (30%). Comparative genomic analysis revealed a significant conservation with the T. tepidarius AcaML1-like provirus, excepting the tail genes, and a high conservation of the virus across strains of the A. caldus species. Such conservation extends from the modules architecture to the gene level, suggesting that organization and composition of these viruses are preserved for functional reasons. Accordingly, the AcaML1 proviruses were demonstrated to excise from their host genomes under DNA-damaging conditions triggering the SOS-response and to produce DNA-containing VLPs. Despite this fact, under the conditions evaluated (acidic) the VLPs obtained from A. caldus ATCC 51756 could not produce productive infections of a candidate sensitive strain (#6) nor trigger it lysis.     

复方复方甲孕环酯片对妇女排卵的影响

本实验对8例于月经周期第10天服用复方甲孕环酯片(100毫克)的妇女进行了尿孕二醇量测定,观察该药对排卵的影响。结果表明,4例对照妇女均正常排卵;而服药的8例中有5例未排卵,3例仍排卵,排卵抑制率为62.5%。服药后,部分排卵抑制者的月经周期缩短。本文对该药的抗生育机理进行了讨论,认为复方甲孕环酯除不完全的抑制排卵以外,还能作用于其它环节,其抗生育作用是多方面的。     

Visual summation in night-flying sweat bees: a theoretical study

Bees are predominantly diurnal; only a few groups fly at night. An evolutionary limitation that bees must overcome to inhabit dim environments is their eye type: bees possess apposition compound eyes, which are poorly suited to vision in dim light. Here, we theoretically examine how nocturnal bees Megalopta genalis fly at light levels usually reserved for insects bearing more sensitive superposition eyes. We find that neural summation should greatly increase M. genalis's visual reliability. Predicted spatial summation closely matches the morphology of laminal neurons believed to mediate such summation. Improved reliability costs acuity, but dark adapted bees already suffer optical blurring, and summation further degrades vision only slightly.     

复方丹参缓释片中水溶性成分体外释放度研究

目的:研究复方丹参缓释片溶出度,探索中药复方缓释制剂的评价方法。方法:采用转篮法和高效液相色谱指纹图谱评价。结果:通过对6个时间点进行取样测定,丹参缓释片水溶性成分能够比较均衡的释放出来,具有一致的均衡释放行为,从丹酚酸B的释放行为来看较符合Higuchi方程释放,以人参皂苷Rg1的释放行为来看较符合零级释放。结论:丹参缓释片水溶性成分溶出度具有良好的缓释行为。方法快速、简便稳定,可用于评价复方丹参缓释片水溶性成分体外释放度。     

复方次氯酸钠消毒剂用于口腔器械消毒的实验研究

目的研究复方次氯酸钠消毒剂对医院口腔器械消毒的效果。方法采用口腔器械模拟现场消毒试验方法对污染乙型肝炎表面抗原的灭活效果进行观察。结果用含有效氯500 mg/L以上复方次氯酸钠消毒液浸泡作用10 min,对污染到口腔器械表面的乙型肝炎表面抗原灭活率达到100%。含有效氯1000 mg/L的复方次氯酸钠消毒液连续浸泡常用口腔器械10 d未见明显腐蚀。结论本研究复方次氯酸钠消毒剂对污染到口腔器械上的乙型肝炎表面抗原具有快速的灭活效果,并且对器械基本无腐蚀。