Bio-guided isolation of plant growth regulators from allelopathic plant-Codonopsis pilosula: phyto-selective activities and mechanisms

Natural pesticides are the subject of growing interest, as the overuse of synthetic pesticides severely threatens the safety of humans and the eco-environment. Allelopathic plants can release plentiful secondary metabolites as natural plant growth regulators to affect the growth of neighboring plants. Bio-guided isolation of the aerial waste part of typical allelopathic plant-Codonopsis pilosula led to six active compounds being produced, including ginsenoside Rg₁ (1), ginsenoside Re (2), luteolin (3), luteolin-5-O-glucoside (4), ginsenoside Rb₁ (5) and lobetyolin (6). Ginsenosides and luteolin-5-O-glucoside were firstly found in Codonopsis. Phyto-activity tests showed that all compounds showed inhibiting effects toward C. pilosula, and compounds 2, 4, 5 and 6 were also inhibitors of Amaranthus retroflexus. By contrast, the compounds promoted the seedling growth of wheat, rice and Setaria viridis. At certain concentrations, compounds 1, 4, 5 and 1, 2, 4 could observably promote the growth of wheat and rice seedlings, respectively, exceeding Setaria viridis. The different effects toward the two weeds might be related to the different ROS levels induced by the compounds. The ROS amounts in the root tips of S. viridis were as low as those in the control test, and the ROS content in the root tips increased with aggravation of the inhibition effect. In summary, successful isolation of phyto-selective chemicals from allelopathic plants may provide a promising method for natural herbicide screening. The compounds isolated could potentially be applied as inhibitors of dicotyledon weeds and promoters of monocotyledon crops for weed management in agriculture.

Bio-guided isolation of the aerial waste part of typical allelopathic plant-Codonopsis pilosula led to six active compounds being produced.     

小儿噬血细胞综合征的发病机制及预后危险因素的分析

目的:探讨儿童噬血细胞综合征(white blood cell syndrome,HPS)的临床特点?诊断标准?治疗过程以及预后的相关危险因素?方法:回顾分析2009—2013年南京市儿童医院血液肿瘤科收治的72例儿童HPS的临床表现?辅助检查?治疗及转归,采用Logistic方法分析患儿的预后危险因素?结果:72例中42例(58.3%)是感染相关性HPS,其中EB病毒感染相关性HPS最多;其余的30例中4例(5.56%)是非感染相关HPS,26例(36.1%)病因不明?临床表现为发热(91.7%)?肝脏肿大(83.3%)?脾脏肿大(66.7%)?外周血血常规三系检查结果为两系减低(72.2%),三系低下(27.8%),血红蛋白浓度减低(91.7%),血小板数量减少(77.8%);血生化检查血清甘油三酯升高(38.9%);凝血常规检查功能障碍(41.7%);血清铁蛋白升高(55.6%);骨髓细胞形态学检查大部分找到了噬血细胞?72例中死亡10例(13.8%),好转或者基本痊愈24例(33.3%),出院后失访14例(19.4%)?年龄<3岁?乳酸脱氢酶(LDH)>2 500 U/L是不利的危险因素?结论:年龄小和LDH水平增高是儿童HPS预后不良的危险因素,应该及早诊断治疗,降低病死率?     

左室舒张性心衰患者左室舒张末期压力、肺毛细血管楔嵌压与N-末端脑钠肽前体的相关性研究

[摘要]　目的　探讨舒张性心衰患者血清N-末端前脑利钠肽（NT-proBNP）与左室舒张末期压力（LVEDP）、肺毛细血管楔嵌压(PCWP)的相关性及其在不同严重程度舒张性心衰患者中的诊断价值。　方法　心功能正常患者30例为正常组;心功能异常的患者60例为异常组,并按NYHA心功能分级分为3个亚组,Ⅰ~Ⅲ级各20例。采用6F猪尾导管测定LVEDP,经Swan-Ganz导管检查测定PCWP,电化学发光仪RocheElecsys 2010测定NT-proBNP。分析NT-proBNP与LVEDP、PCWP的相关性。　结果　　随着心功能级别增加,异常组血浆NT-proBNP、LVEDP、PCWP水平与正常组比较,显著升高(P<0.01)。直线相关分析表明LogNT-proBNP与LVEDP呈显著正相关(r=0.793,P<0.01)。LogNT-proBNP与PCWP亦呈显著正相关(r= 0.657,P<0.01)。　结论　血清NT-proBNP定量检测是左心室舒张功能受损的敏感指标,NT-proBNP对舒张性心衰严重程度具有明确的诊断价值。     

一起腺病毒引起的急性呼吸道感染暴发调查分析

目的：分析一起腺病毒引起的急性呼吸道感染暴发疫情调查结果,为同类突发公共卫生事件的防治提供科学的依据。方法搜索病例,以年级、性别作为匹配因素,开展病例对照研究,分析发病危险因素。结果本次暴发疫情共报告急性呼吸道感染病例47例,无死亡,罹患率为8．88％,临床症状以发热为主,合并肺炎占27．7％。病例对照研究显示,与急性呼吸道感染症状者的近距离接触存在显著性（χ2＝7．96,P＜0．05）,且接触时间长、短的差异有统计学意义（χ2＝7．95,P＜0．05）;洗手习惯存在显著性（χ2＝25．92,P＜0．05）,用手直接擦鼻涕的习惯差异有统计学意义（χ2＝22．78,P＜0．05）。结论较长时间接触感染腺病毒的患者可能是引起发病的主要危险因素,尤其是同桌和共同玩耍。养成良好的个人卫生习惯,经常洗手和不用手直接擦鼻涕都是重要保护因素。加强卫生习惯和卫生意识的培养,是呼吸道传染病主要和重要的预防措施。     

早期集束化治疗在经皮肾镜碎石术后感染性休克患者的应用价值

目的：探索早期集束化治疗在经皮肾镜碎石（PCNL ）术后感染性休克患者的应用价值。方法回顾性分析2011年1月至2013年9月因PCNL术后并发感染性休克入住该院中心ICU的患者,根据是否采取感染性休克集束化治疗分为非集束化治疗组28例,集束化治疗组26例。比较两组患者治疗前、治疗后第1、3、5天APACHE‐Ⅱ评分和SOFA评分,ICU停留时间情况。根据28 d随访结果比较两组患者病死率。结果同非集束化治疗组比较,集束化治疗组第1、3、7天APACHE‐Ⅱ评分和SOFA评分均明显降低,差异有统计学意义（P＜0．05）。随访28 d ,集束化治疗组患者病死率（15．38％）明显低于非集束化治疗组（35．71％） ,差异有统计学意义（ P＜0．05）。非集束化治疗组和集束化治疗组患者IC U 停留时间分别为（9．04±4．48）d和（7．00±2．32）d ,差异有统计学意义（ P＜0．05）。结论早期集束化治疗有利于减轻PC N L术后感染性休克患者病情严重程度,减少病死率。     

TALE-TFs构建方法的建立及优化

目的：在传统方案的基础上建立一种经济有效且易于操作的类转录激活效应子转录因子（TALE‐TFs）的构建和功能检测方案。方法采用基于PCR的Golden gate克隆法分别尝试构建类转录激活效应物（TALEs）的六聚体、五聚体、四聚体和三聚体,比较构建结果,选择最优效果方案进行TALE‐TFs的构建。采用片段置换反应（FSR）构建了含有 TALE‐TFs结合片段的RFP质粒pminCMV ,并与TALE‐TFs进行共转染,观察红色荧光验证TALE‐TFs的转录活性。结果 TALEs中所含的串联重复模块越少,获得的构建产物越多。共转染时,TALE‐TFs使得pminCMV成功启动表达。结论该研究为不同条件下实验方案的选择提供了依据,并利用含有TALE‐TF结合片段和红色荧光的质粒建立了快捷直观的转录活性验证方法。