水鳖蕨配子体系统学特征的培养观察

在光学显微镜下观察了水鳖蕨(Sinephropteris delavayi(Franch.)Mickel)配子体发育的详细过程。水鳖蕨孢子培养6 d左右萌发;原丝体单列细胞,或发育出2~3个分支;片状体生长点不明显,成熟配子体近心形。本文还讨论了其生长点、毛状体及性器的发育特点,结果支持Mickel将水鳖蕨独立成属的观点。     

SPARC在子宫内膜癌组织中的表达及意义

目的：探讨富含半胱氨酸的酸性分泌型蛋白（secreted protien,acidic and rich in cysteine,SPARC）在子宫内膜癌组织中的表达及其临床意义。方法：应用组织芯片技术研究SPARC在正常子宫内膜、增生的子宫内膜和子宫内膜癌组织中的表达情况。结果：SPARC在正常子宫内膜、增生的子宫内膜和子宫内膜癌组织中的阳性表达率分别为96.55%、76.79%、59.50%,差异具有统计学意义（P〈0.05）。在子宫内膜癌中,SPARC的表达强度与手术-病理分期、组织学分级、肌层浸润深度和淋巴结转移相关,差异具有统计学意义（P〈0.05）。结论：SPARC表达的缺失与子宫内膜癌的发生、发展密切相关,检测SPARC可为子宫内膜癌的早期诊断、进一步治疗及预后判断提供一定的理论依据。     

Long-Range Correlations of Global Sea Surface Temperature

Scaling behaviors of the global monthly sea surface temperature (SST) derived from 1870–2009 average monthly data sets of Hadley Centre Sea Ice and SST (HadISST) are investigated employing detrended fluctuation analysis (DFA). The global SST fluctuations are found to be strong positively long-range correlated at all pertinent time-intervals. The value of scaling exponent is larger in the tropics than those in the intermediate latitudes of the northern and southern hemispheres. DFA leads to the scaling exponent α = 0.87 over the globe (60°S~60°N), northern hemisphere (0°N~60°N), and southern hemisphere (0°S~60°S), α = 0.84 over the intermediate latitude of southern hemisphere (30°S~60°S), α = 0.81 over the intermediate latitude of northern hemisphere (30°N~60°N) and α = 0.90 over the tropics 30°S~30°N [fluctuation F(s) ~ s^α], which the fluctuations of monthly SST anomaly display long-term correlated behaviors. Furthermore, the larger the standard deviation is, the smaller long-range correlations (LRCs) of SST in the corresponding regions, especially in three distinct upwelling areas. After the standard deviation is taken into account, an index χ = α * σ is introduced to obtain the spatial distributions of χ. There exists an obvious change of global SST in central east and northern Pacific and the northwest Atlantic. This may be as a clue on predictability of climate and ocean variabilities.     

两种耐热磷酸化酶的构建及高效催化合成红景天苷

目的:使用表达耐热蔗糖磷酸化酶的大肠杆菌重组工程菌E. coli BL21/pET-Spase和耐热纤维二糖磷酸化酶的大肠杆菌重组工程菌E. coli BL21/pET-Cpase,发酵培养后粗酶液作为催化剂,以价格低廉的蔗糖为原料合成红景天苷。方法:分别构建耐热蔗糖磷酸化酶和耐热纤维二糖磷酸化酶大肠杆菌重组菌,然后将重组菌、蔗糖、酪醇和磷酸混合,得到反应混合物,使反应混合物在45℃下转化,而产生红景天苷。结果:在耐热蔗糖磷酸化酶酶液1200 U/L、耐热纤维二糖磷酸化酶酶液500 U/L、蔗糖110 g/L、酪醇30 g/L和磷酸50 m M的浓度下,反应条件为pH 7.0、温度45℃、转速50转/分、反应时间32小时后,红景天苷浓度达到23.7 g/L。结论:本研究使用蔗糖磷酸化酶和纤维二糖磷酸化酶联合催化的工艺,成功地高收率合成了红景天苷。同时,本研究构建的耐热磷酸化酶酶活高,处理简单,为拓展糖苷类似物的合成提供了一种新的方法。     

Soluble expression, purification and functional identification of a disulfide-rich conotoxin derived from Conus litteratus

Conotoxins are a diverse array of small peptides mostly with multiple disulfide bridges. These peptides become an increasing significant source of neuro-pharmacological probes and drugs as a result of the high selectivity for ion channels and receptors. Usually, the analogue of natural conotoxins is produced by means of chemical synthesis. Here, we present a simple and fast strategy of producing disulfide-rich conotoxins via recombinant expression. By fused with thioredoxin and His tag, a novel O-superfamily conotoxin lt7a was successfully expressed in Escherichia coli and purified, resulting in a high yield of recombinant lt7a about 6 mg/l. The purity of target protein is up to 95% as identified by HPLC results. Whole cell patch-clamp recording revealed that the new conotoxin blocked voltage-sensitive sodium channels in rat dorsal root ganglion neurons, indicating it might be a novel microO-conotoxin.     

黄原胶与丙烯酰胺接枝共聚反应的研究

以过硫酸铵为引发剂,在N2气保护下,研究了黄原胶(XG)与丙烯酰胺(AM)的接枝共聚反应.考察了单体浓度、引发剂浓度、反应温度和反应时间等因素对接枝率及接枝效率的影响,探讨了过硫酸铵引发黄原胶接枝丙烯酰胺共聚反应的基本规律.采用红外光谱(FT-IR)、X射线粉末衍射(XRD)对接枝共聚物的结构进行研究,用热重分析(TGA)法表征了产物的热性能,并初步探讨了接枝机理.     

慢性非细菌性前列腺炎/慢性骨盆疼痛综合征患者的尿动力学检查

目的:探讨尿动力学检查在了解慢性非细菌性前列腺炎/慢性骨盆疼痛综合征(Chronicabacterialprostatitis/chronicpelvicpain syndrome,CPPS)患者中下尿路症状(LUTS)产生原因的作用。方法:对36例难治性慢性前列腺炎/盆腔疼痛综合征患者行尿流动力学压力-流率测定,同步测定膀胱压、逼尿肌压、同步肌电图测定,了解其症状产生的原因。结果:36例患者中,尿动力学证实膀胱出口梗阻14例(39%);逼尿肌过度活动者8例,其中有7例与BOO同时存在;假性逼尿肌尿道外括约肌协同失调6例(16.7%);逼尿肌收缩力低下者5例(13.9%)。结论:对难治性CPPS患者进行尿动力学检查有助于对此类患者LUTS产生的原因进行鉴别,从而可以采取有针对性的治疗。