干旱胁迫对桂花幼苗生长及生理生化特性的影响

以一年生桂花苗木为材料,通过盆栽模拟干旱环境,设置了田间最大持水量的15%(W4)、30%(W3)、45%(W2)、60%(W1)、75%(CK)5个梯度,研究不同干旱胁迫程度对桂花幼苗生长、生理生化特性的影响。结果表明,干旱胁迫下桂花超氧化物歧化酶活性、过氧化物酶活性、相对电导率、丙二醛含量、游离脯氨酸、可溶性糖质量分数显著上升,W4处理下分别比对照上升了21.3%、8.0%、91.3%、108.2%、117.9%和56.5%,苗高、地径、根生物量、总生物量、叶绿素a、叶绿素b和总叶绿素质量分数显著下降,分别比对照下降12.0%、25.7%、34.4%、36.0%、31.4%、30.6%和30.8%。对13个抗旱指标进行主成分分析,主成分1和主成分2贡献了96.07%。     

茴茴蒜迁移进化特征研究

从形态学及细胞学两方面,运用居群学的方法对茴茴蒜(Ranunculus chinensis Bunge)在贵阳、昆明、大理、思茅、勐腊等地的进化特征进行了分析,根据分析结果并结合毛茛属(Ranunculus L.)植物的迁移进化特征,推测茴茴蒜在中国大陆的进化迁移路线很可能是从西到东,即经度不断增加的方向。     

丁香抗氧化活性物质提取及人工胃肠液对其活性的影响

采用水浴振荡、超声、微波和超声-微波协同对丁香抗氧化活性物质进行了提取,并用人工胃、肠液对有效部位进行了处理。结果表明,在4种提取方法中,协同提取和微波提取总多酚、总黄酮得率以及抗氧化能力要优于另外2种方法,协同提取时间仅为微波提取的1/2,协同提取效率最高。人工胃液处理后,丁香有效部位抗氧化活性得到显著提高(P<0.001),而人工肠液处理后,其抗氧化活性却显著性降低(P<0.001)。     

MC4R基因表达及其与鸡屠宰性状的相关分析

根据鸡MC4R mRNA和看家基因β-actin mRNA序列,分别设计1对引物,以半定量RT-PCR法研究不同品种鸡肾上腺中MC4R基因mRNA表达水平,并分析了其与屠宰性状间的相关关系。结果表明,京海黄鸡公鸡MC4R基因在肾上腺中的表达水平显著高于尤溪麻鸡公鸡（P＜0.05）;京海黄鸡公鸡的胴体重、胸肌重、腿肌重与MC4R基因在肾上腺中表达水平存在极显著相关（P＜0.01）;尤溪麻鸡公鸡的胴体重与MC4R基因在肾上腺中表达水平存在极显著相关（P＜0.01）,胸肌重、腿肌重与MC4R基因在肾上腺中表达水平存在显著相关（P＜0.05）。     

Characteristics of UHF partial discharge signal waveforms of typical insulated defects in GIS

In order to analyze the discharge features of different insulation defects in various experimental conditions, according to characteristics of partial discharge (PD) from the insulation defects in gas insulated switchgear (GIS)) and using ultra high frequency (UHF) method, a lot of PD experiments are carried out based on the designed four typical physical models of insulation defects of GIS in the simulation device, and the real samples of UHF PD waveforms are recorded. The features of UHF PD waveforms in the different situations are discussed and analyzed in detail, which include different sizes or positions of the physical models or under the different voltages and so on. The results show that in low voltage, regardless of types of UHF electromagnetic wave excited by PD sources, the shapes of PD waveform changed little before the changes of waveform. The remaining time is about several nanoseconds.     

3D modeling based on internet collaborative design

A novel approach for 3D modeling was developed. It used form feature to represent the share model, parameterized the form feature, and established its parameter list. Any change of the share model was viewed as the parameter modification of the form feature to modify the parameter list, and the new model was recreated through accessing the log of feature modeling. Based on it, a framework which supports synchronous Internet based collaborative design among members in distributed design teams was presented. It was composed of the 3D share modeling network feature modeling server, feature modeling clients, and the standard communication protocols. All the clients use the same server to maintain the 3D feature modeling, guaranteeing data consistency, keeping all clients up to date, and managing all communications.     

Cost analysis of water supply plants in small towns in western China

We derived the cost index value and cost formula of water supply and water purification in small towns in Chongqing, P. R. China, based on the economic index of domestic water supply plants, the cost model of domestic and overseas economic indices, and local labor and materials prices. Investment estimation indices for water supply plants in western small towns subsequently were obtained according to the equipment transportation rate and adjustment coefficients in other areas of western China. We analyzed the cost of producing water in water supply plants in small western towns based on the cost structure analysis and the cost model of investment index, and subsequently derived the unit cost for producing water.     

利用SSR分子标记分析苎麻居群的取样策略

[目的]研究我国重要纤维植物苎麻的遗传多样性,确定苎麻居群的合理取样策略。[方法]以不同生境的5个居群为研究对象,每个居群分单株采集24株,分为4、8、12、16、20、24株6个取样梯度,利用8对SSR引物进行遗传多样性分析。[结果]①分布于不同生境的苎麻居群的等位基因数和遗传多样性指数各不同;②随着分析单位个体数目从4株增加到20株,各居群的多态位点数和遗传多样性指数均表现增大的趋势,但当分析单位的个体数目在加株以上时,多态位点数和遗传多样性指数基本不再发生变化;⑧当分析单位个体数目为20株时,各居群的多态住点数和遗传多样性指数分别包含了各自居群95％以上的遗传变异。[结论]在利用SSR技术进行苎麻居群遗传多样性研究中,以单个居群随机采集20株苎麻为最少分析单位个体数目。