环湖北岸麻黄科植物种类形态特征及经济用途

环青海湖北岸的麻黄科植物共有1科1属4种,即中麻黄、草麻黄、单子麻黄、矮麻黄[1-3],现将种类形态特征及经济用途介绍如下. 1 麻黄属特征(科属同征)     

Expression and Significance of MicroRNA-21 and P-gp in Colon Cancer Cells

[Objectives]To investigate the expression and significance of miR-21 and P-gp in colon cancer cell line HCT-15.[Methods]RT-qPCR was used to detect the miR-21 and ABCB1 mRNA expression level of P-gp coding genes in normal colon mucosal cell NCM460 and colon cancer cell HCT-15,and Western Blot was used to detect the expression of P-gp in these two cell lines.[Results]The results of RT-qPCR showed that the expression level of miR-21 and ABCB1 mRNA in colon cancer cell HCT-15 was significantly higher than that in normal colon cell NCM460,and the difference was statistically significant(P<0.05).Western Blot results showed that the expression level of P-gp in HCT-15 was significantly higher than that in NCM460,and the difference was statistically significant(P<0.05).[Conclusions]The expression level of miR-21 and ABCB1 mRNA/P-gp in colon cancer cell HCT-15 was higher than that in normal colonic mucosal cell NCM460,and the relationship between miR-21 and multidrug resistance in colon cancer might be related to P-gp.     

遵义县白菜不同配方施肥效果初探

为指导农户生产,进行了6个不同施肥量比较试验.结果表明：白菜施肥量为清粪水1500kg/667m2,尿素20kg/667m2,普钙50kg/667m2,氯化钾13kg/667m2,单产高,经济效益好,可在遵义县推广.     

百令胶囊对COPD患者肺功能的影响

目的观察百令胶囊对稳定期慢性阻塞性肺疾病(COPD)患者肺功能的影响。方法采用随机数字表法将68例稳定期COPD患者随机分为治疗组与对照组各34例。2组患者均根据病情进行家庭氧疗,根据病情选用速效β受体激动剂、抗炎及祛痰药物。治疗组辅以百令胶囊口服(1g/次,3次·d-1,连服12周),于治疗1d (T1)、治疗(6周±2d)(T2)、治疗(12周±2d)(T3)检测受试者肺功能,记录1s用力呼气容积占预计值百分比(FEV1%Pre)、1s用力呼气容积/用力肺活量(FEV1/FVC)、每分钟最大通气量(MVV)。结果治疗前2组患者肺功能各项指标比较差异无统计学意义(P0.05)。治疗(6周±2d)时,对照组FEV1%Pre、FEV1/FVC、MVV较同组治疗前差异无统计学意义(P0.05);治疗组FEV1%Pre、FEV1/FVC亦较本组治疗前差异无统计学意义(P0.05),MVV高于同组治疗前(P0.01),且高于同期对照组,差异有统计学意义(P0.05)。治疗(12周±2d)时,对照组MVV较同组治疗前不升反降,差异有统计学意义(P0.01),对照组的FEV1%Pre、FEV1/FVC较治疗前无明显变化(P0.05);治疗组此3项指标均较同组治疗前显著升高(P0.05或P0.01),2组同期相比,治疗组此3项指标均优于对照组(P0.05或P0.01)。结论百令胶囊能提高稳定期COPD患者肺功能,且无明显不良反应发生,值得临床推广应用。     

甘肃多儿国家级自然保护区维管植物区系分析

基于野外实地考察、植物标本的采集与鉴定以及结合文献研究的方法,分析了多儿保护区维管植物区系的物种组成和分布区类型。结果表明,该区维管植物共115科469属1323种,包括蕨类植物14科25属61种,裸子植物4科8属25种,被子植物97科436属1237种。多儿保护区维管植物区系优势现象明显,≥20种的优势科共879种,占该区维管植物总种数的66.44%;小属和单种属成分比例较大,占该区维管植物总属数的95.31%,总种数的75.51%。科级水平上,热带科（30.43%）稍多于温带科（26.96%）;属级水平上,温带科（72.49%）明显高于热带科（13.01%）;种级水平上,中国特有种有545种,其中538种与周边省份所共有,体现了该区系明显的过渡性和交汇性。该保护区维管植物区系地理成分复杂多样,属的分布有15个分布型和5个变型,温带地理成分占绝对优势,尤其以北温带分布为主。该区珍稀濒危野生植物较多,被列入保护名录有37种;一些古老、孑遗植物在该保护区具有良好的原始类群分布。本研究进一步完善了多儿保护区维管植物区系特征,为以后了解该保护区生物多样性提供可靠依据。     

杏果输送过程中定向稳定性的试验研究-基于正交试验

杏果输送过程中定向稳定性问题的关键所在是寻找影响定向成功率的主要因素,将各影响因素经过科学的组合对比,找到最佳组合,提高水果在实际生产过程中的定向成功率。为此,利用正交试验、高速摄像仪和动应变测量系统相结合的方法确定影响杏果定向成功率的主要因素,即入口通道宽度(D)、夹持带的速度大小(V)、杏子尺寸大小(I)。通过正交对比试验,得知底部输送带采用齿皮带时比光皮带的定向效果好,最佳试验因素组合是D=30mm、V=1.29m/s、I=34~35mm。利用高速摄像观测统计发现:杏果大部分在定向通道的第3区域达到定向稳定。考虑夹持片对输送带振动影响的情况下,统计出杏子的定向稳定区域主要集中于输送通道的第3区域,为杏子切刀的位置选择提供了依据。     

Fault Section Diagnosis Algorithm of Distribution Networks Based On Topology Identification

An algorithm of fault section diagnosis based on topology identification for distribution networks is presented. By decomposing the topologic matrix which describing the distribution network into two parts,one part only contain the complex coupling factor ,and the other ignore the complex coupling factor. Using this method, the fault zones in distribution network can be identified and isolated efficiently, and the vertexes of the zones can also be identified automatically. This approach adapts to the changefully network structures.     

Work-hardening Mechanism of Non-magnetic High Manganese ZG25Mn18Cr4 Castings

The important character of non-magnetic high manganese ZG25 Mn18Cr4 alloy is rapid work-hardening under external stress. With X-ray diffraction and TEM analysis, it is proved that the microstructures of both undeformed and deformed matrixes are austenite and carbide with some striation structure in the matrixes, the amount of stripes in the deformed matrix is obviously more than that in the undeformed matrix. Electronic diffraction analysis confirmed that the stripes in coarse austenite grains are high density lamination fault sheets. A great deal of lamination fault sheets produced by plastic deformation divides up austenite matrix, shortens the free distance of dislocation movement and results in the rapid work-hardening of ZG25Mn18Cr4 alloy.     

Mechanical Signalling in Plant: Perception and Transduction Pathway

The metabolism and development of plants are controlled through interplay between genetic and environmental cues.For optimal growth plants require the ability to coordinate complex developmental processes and at the same time sense and respond to environmental stimuli.The responses can be divided into three main events: stimulus perception,generation and transmission of a signal,and subsequent changes in downstream biochemical processes.Because of space limitation this review does not provide an exhaustive account of plant signal transduction.Rather,the authors intention is to cover new and important results in this field,including the mechanochemical transform mediated by integrin and integrin-like protein,the change of membrane fluidity respond to stimulus,and the wide accepted transduction pathway of calcium signaling system.The research emphasis and tendency are prospected.