迷迭香对大强度耐力训练大鼠血清抗氧化酶活性及某些生化指标的影响

以SD雄性大鼠为实验对象,通过建立大强度耐力训练运动模型,研究迷迭香及大强度耐力训练对大鼠血清抗氧化酶活及某些生化指标的影响,结果显示,大强度耐力训练可使大鼠血清中SOD、GSH-Px活性升高,CAT活性下降。服用迷迭香后,不论是安静组还是运动组这3种抗氧化酶活性都明显升高。大强度耐力训练后大鼠的1ib含量稍有下降,迷迭香可以改善这种现象,使大鼠Hb含量明显上升,提示迷迭香能提高有氧运动能力．运动状态下各组血清MDA含量分别低于其相应的安静状态下各组,服用迷迭香的运动、安静组血清MDA含量明显低于其相应的对照组服用迷迭香的大鼠血中肌酐含量明显高于其相应的对照组,说明迷迭香能增加肌肉中肌酸和磷酸肌酸含量,提高肌肉机能水平。     

毛大丁草根水煎剂对受试动物的镇咳、祛痰、平喘作用

目的：观察毛大丁草根水煎剂对受试动物的镇咳、祛痰、平喘作用。方法：采用氨水诱咳法分别观察毛大丁草根水煎剂对小鼠咳嗽次数及咳嗽潜伏期的影响;酚红排泌法检测毛大丁草根水煎剂对小鼠呼吸道酚红排泌量的影响;离体气管法观察毛大丁草根水煎剂对乙酰胆碱（Ach）、组胺（His）诱导的豚鼠离体气管平滑肌收缩的影响。结果：毛大丁草根水煎剂可减少小鼠咳嗽次数、延长咳嗽潜伏期;可增加小鼠呼吸道酚红排泌量;可降低Ach、His诱导的豚鼠离体气管平滑肌的收缩张力。结论：毛大丁草根水煎剂对受试动物具有镇咳、祛痰、平喘作用。     

Synergistic interaction of NaCl and Cd on growth and photosynthetic parameters in soybean genotypes differing in salinity tolerance

The effects of salinity(50 mmol/L NaCl) and Cd(1 μmol/L CdCl2) as sole and combined on growth and photosyn-thetic parameters were studied using two soybean genotypes,Huachun 18 and NGB.The concentrations of Cd2 ,Zn2 ,Ca2 ,Mg2 ,K and Na were also determined in seeds and pods.Huachun 18 suffered a more serious decrease than NGB in net photosynthetic rate(Pn) in the treatments of salinity stress alone and combined stress(NaCl Cd),showing that it is relatively sensitive to salinity.The decrease in Pn caused by salt stress in Huachun 18 was mainly due to the reduced total chlorophyll content and photosynthetic efficiency(the ratio of variable fluorescence to maximal fluorescence,Fv/Fm),whereas the decease in NGB was mainly related to reduced stomatal conductance(Gs).The combined stress of both Na and Cd did not induce further decrease in photosynthesis and fluorescence in the two genotypes relative to salt or Cd stress alone.Greater change in the pod concentrations of Zn2 ,Ca2 ,Mg2 ,K and Na was detected under salt stress for Huachun 18 than for NGB.The results suggested that the interactive effect of NaCl-Cd on growth and nutrient uptake differs between the two soybean genotypes.     

苜蓿RAPD引物筛选及条件优化的研究

用SDS法提取了苜蓿基因组DNA的模板。从100个10bp的随机引物中筛选出了12条能在11个苜蓿品种中均能扩增出清晰的片段的引物。应用L16(45)正交表,研究了DNA、dNTPs、Mg2 、Taq酶和引物的浓度对扩增迁移率重现性的影响。用这种方法建立的苜蓿RAPD-PCR优化反应体系为:20μL体系中含DNA模板的浓度是5.0mg/L、dNTPs浓度是0.175mmol/L、Mg2 浓度是1.25mmol/L、Taq酶在20μL的体系中是1.00U、引物浓度是0.40μmol/L。     

酚酸类物质对大巢菜萌发及幼苗生长的影响

采用不同浓度的两种酚酸类物质及其混合物对大巢菜种子及幼苗进行处理,测定其对大巢菜发芽率、营养生长及其某些生理指标的影响。结果表明,酚酸类物质及其混合物可以显著延缓大巢菜种子发芽所需要的时间,降低最终的萌发率;对大巢菜幼苗的根长度、苗高度及干物质积累有一定的抑制作用;同时,根系活力与叶绿素含量也有不同程度的下降。     

Relationship Between Intercultural Communicative Competence and L2-Learning Motivation of Iranian EFL Learners

In today's interconnected multicultural world, citizens' differential levels of intercultural communicative competence (ICC) can play an important role in the amount of enthusiasm, time, and efforts they invest in second or foreign language (L2) communication and learning. ICC has recently found its way into L2 theory and research. This study attempted to first develop a measure of ICC and then explore the relationship between Iranian L2 learners' ICC and their L2 learning motivation, on the one hand, and between gender and the development of ICC, on the other. The participants were 180 B.A. English Literature/Translation and M.A. TEFL (Teaching English as a Foreign Language) students at several Iranian universities. A test battery including the final version of the ICC questionnaire and an L2-learning motivation questionnaire adapted from Gardner's attitude/motivation test battery was then administered to a random selection of 70 students (M = 30 and F = 40). The correlation results indicated that there was a strong, positive relationship between L2 learners' ICC and L2-learning motivation. Meanwhile, t-test results demonstrated that Iranian female and male L2 learners did not possess different levels of ICC. The finding related to the ICC and motivation association suggests that an account of ICC development be incorporated into L2 teachers' classroom agendas at different educational levels.     

关于转换提单的若干问题探讨

近年来,有关转换提单的争议很多,已引起航运界的普遍关注。本文在分析了转换提单的涵义、功能、对船东的风险以及目前船东办理转换提单程序存在的问题的基础上,对船东如何办理转换提单提出相应的对策和建议。     

国际贸易中信用证"软条款"分析

信用证通常被认为是国际贸易中最安全的支付方式之一,但贸易实践中,“软条款”就像埋伏在信用证中的一颗定时炸弹,随时威胁着出口商的结汇安全。及时识别信用证中的“软条款”,采取必要的预防措施,把收汇风险消灭在萌芽状态,在贸易各环节严格把关,防患于未然,是出口商的最佳选择。     

基于广义最小最大凹惩罚项的ISAR稀疏成像方法

介绍一种基于广义最小最大凹（generalized minimax concave,GMC）惩罚项的ISAR稀疏成像方法。该方法的惩罚项形式与L₁范数最小化方法不同,不仅使最小二乘损失函数凸性最小,而且避免了L₁范数最小化方法系统性幅值低估问题。通过仿真实验说明GMC算法在ISAR成像中的幅度保持特性。利用Yak-42飞机的实际数据进行ISAR成像,结果表明GMC算法在成像精度方面优势明显,具有更好的成像效果。     

铜对不同水稻品种种子萌发及根尖分生细胞钙分布的影响

以16个水稻品种为材料,测定了铜对水稻种子萌发相关指标,并观察了根尖有丝分裂及分生区Ca分布的影响。结果表明：（1）0．1mM和0．2mMCuSO4溶液处理对水稻根长的抑制作用大于对芽长的抑制,且对不同品种根长的抑制作用存在明显差异;（2）随着铜处理浓度（25、50、75、100μM）的升高,根尖细胞有丝分裂指数及相对有丝分裂指数皆呈下降趋势;（3）t常生长条件下,水稻根尖分生区细胞中的Ca主要分布在液泡和细胞间隙中,而细胞质、细胞核中分布很少;50μM铜处理下,根尖分生区细胞液泡和胞间的Ca沉淀颗粒明显减少,而胞质及核基质中的Ca沉淀颗粒增多。铜胁迫造成根尖细胞中原有Ca分布的变化可能是引起细胞功能的紊乱,进而影响根系生长的原因之一。