十六大以来中国农村改革进程的基本判断与前瞻

十六大以来,中国新一轮农村改革发展的一条主线是"多予、少取、放活".目前,农村税费改革已取得了阶段性的巨大成功,国民收入分配结构和财政支出结构正向农村地区倾斜,"三农"问题初步得到了缓解,我国在总体上进入到了"后农业税时代"和"工业反哺农业、城市支持农村"的新的发展阶段.下一步深化农村改革的重点、难点是逐步消除城乡二元体制对经济社会协调发展所造成的瓶颈制约,从根本上解决"三农"问题的深层次矛盾和体制性障碍;最大的突破口选择是加快推进农村综合配套改革,进一步做好"放活"这篇大文章,充分发挥9亿农民的市场主体地位和作用,激发农民自我发展和自我积累的巨大潜能,不断提高和增强农业和农村经济发展的内部活力.     

基于TMS320C54x DSP的MPEG-2 AAC解码器设计

MPEG-2 AAC是一种高效多声道音频编码标准,能够在高压缩比率下提供高音质.TMS320C54x是一款价格低廉的16位定点DSP,本文提出了用此类DSP实现MPEG-2 AAC解码器的方法,特别对滤波器组模块进行了优化设计.实验结果表明,低成本的TMS320C54x DSP能够完成有限音质的MPEG-2 AAC解码器低复杂度的实现.     

内田实验与卡特尔16PF的相关研究

通过对大二学生进行内田实验和卡特尔16PF测验,探索内田实验重要指标和卡特尔16PF的相关.研究表明,动摇率与卡特尔16PF中的因素I、因素L、因素M、因素Q1、因素Q2、因素Q4存在高相关.因素M、因素Q1、因素Q4、因素G能很好地预测动摇率.动摇率上,文理生差异显著.其他内田重要指标和卡特尔16PF人格测试的部分因素存在相关.     

Characterization of root-nodulating bacteria on Retama raetam in arid Tunisian soils

The aim of this study is to investigate the diversity of Retama raetam root-nodule bacteria isolated from arid regions of Tunisia. Twelve isolates, chosen as representative for different 16S rRNA gene patterns, were characterized by 16S rRNA gene sequencing and phenotypic analysis. Isolates were assigned to Sinorhizobium, Rhizobium and Agrobacterium. Symbiotic properties of Sinorhizobium and Rhizobium isolates showed a large diversity in their capacity to infect their host plant and fix atmospheric nitrogen. Strain RK 22 identified as Rhizobium was the most e?ective isolate.     

Community structure of β-Proteobacterial ammonia-oxidizing bacteria in prawn farm sediment

To examine the community structure of β-Proteobacterial ammonia-oxidizing bacteria （AOB） in prawn farm sediment, the 16S rRNA gene library was constructed with β-Proteobacterial AOB-specific primers. The library was screened by PCR-restriction fragment length polymorphism （RFLP） analysis and clones with unique RFLP patterns were sequenced. Two groups of β-Proteobacterial AOB, the Nitrosomonas and the Nitrosospira, were detected. The Nitrosomonas occupied an absolute dominant position, accounting for more than 90% of total clones in the clone library, while the Nitrosospira accounting for 5.48%. Nitrosomonas-affiliated clones were grouped into the Nitrosomonas marina and the Nitrosomonas sp. Nm143 clusters, and Nitrosospira-affiliated clones were grouped into the Nitrosospira cluster 1. No other clusters of β-Proteobacterial AOB were found. The results enriched our knowledge of AOB diversity in the prawn farm sediment and provided important foundational data for further functional studies of these microbes in mariculture environments.     

Link-16信号的盲检测接收方案设计

空军工程大学电讯工程学院,陕西西安710077     

Phylogenetic studies of Chinese labeonine fishes (Teleostei:Cyprinidae) based on the mitochondrial 16S rRNA gene

The mitochondrial 16S ribosomal RNA gene is sequenced from 24 ingroups taxa, including 18 species from Labeoninae grouped in 13 genera. Phylogenetic analyses are subjected to neighbor joining, maximum parsimony, maximum likelihood and Bayesian analyses. Phylogenetic analysis indicates that Labeoninae is basically a monophyletic assemblage and can be divided into 2 major clades: one comprising the genera Cirrhinus, Crossocheilus and Garra; and the other consisting of the genera Labeo, Sinilabeo, Osteochilus, Pseudoorossocheilus, Parasinilabeo, Ptychidio, Semilabeo, Pseudogyricheilus, Rectori and Discogobio. According to our present analysis,the features such as the presence of the adhesive disc on the chin and the pharyngeal teeth in 2 rows used in the traditional taxonomy of Labeoninae provide scarce information for phylogeny of labeonine fishes.     

EIS法研究16Mn钢在含H2S薄层液膜下的缓蚀行为

用交流阻抗(EIS)技术研究了硫脲和溴化十六烷基吡啶在复配前后对含H2S薄层液膜下16Mn钢的缓蚀行为．结果表明，硫脲和溴化十六烷基吡啶分别都表现出一定的缓蚀效果，复配后具有缓蚀协同效应，存在一个最佳缓蚀浓度极值和一个最佳缓蚀浓度比．对交流阻抗行为进行了解释和讨论。     

1株抗真菌放线菌菌株YIM31530T的多相分类研究

 从云南丽江玉龙雪山采集的土壤样品中分离到1株诺卡菌形稀有放线菌YIM31530T.该菌株具有很强的抗灰霉病、稻纹枯病活性.通过对其进行的包括形态、生理生化特性、细胞壁化学组分以及16SrDNA序列等方面的多相分类研究,确定其为高丽菌属的1个新种,将其命名为抗菌高丽菌(Kribbella antibiotica sp.nov.).该菌株在大多数培养基上生长良好,气生菌丝黄白色,基内菌丝浅黄色至黄白色.气生菌丝和基内菌丝多分枝,常断裂成不规则的杆状体,不游动.