Complete genome of Cobetia marina JCM 21022T and phylogenomic analysis of the family Halomonadaceae

Cobetia marina is a model proteobacteria in researches on marine biofouling. Its taxonomic nomenclature has been revised many times over the past few decades. ~To better understand the role of the surface-associated lifestyle of C. marina and the phylogeny of the family Halomonadaceae, we sequenced the entire genome of C. marina JCM 21022 ~T using single molecule real-time sequencing technology(SMR~T) and performed comparative genomics and phylogenomics analyses. ~The circular chromosome was 4 176 300 bp with an average GC content of 62.44% and contained 3 611 predicted coding sequences, 72 t RNA genes, and 21 r RNA genes. ~The C. marina JCM 21022 ~T genome contained a set of crucial genes involved in surface colonization processes. ~The comparative genome analysis indicated the significant diff erences between C. marina JCM 21022 ~T and Cobetia amphilecti KMM 296(formerly named C. marina KMM 296) resulted from sequence insertions or deletions and chromosomal recombination. Despite these diff erences, pan and core genome analysis showed similar gene functions between the two strains. ~The phylogenomic study of the family Halomonadaceae is reported here for the first time. We found that the relationships were well resolved among every genera tested, including Chromohalobacter, Halomonas, Cobetia, Kushneria, Zymobacter, and Halotalea.     

洞庭湖古湖滨砾石层的发现及意义

洞庭湖曾经是中国第一大淡水湖,解放初期湖泊面积为4350km^2,如今仅有2691km^2.由于洞庭湖承纳“四水”,吞吐长江,是长江中游最重要的调蓄洪湖泊,其变化直接影响到长江中游的防洪和生态环境.因此,洞庭湖的演化一直为学术界所关注.     

应用泉水均衡法分析四川省兴文县新坝水库岩溶渗漏问题

岩溶地区水库渗漏是碳酸盐岩地区兴建水利枢纽的主要工程地质问题之一,尤其是在可溶岩广布、岩溶发育强烈、地形复杂地区。拟建兴文县新坝水库地处岩溶地区,存在岩溶渗漏的可能性。通过对该水库库区地质概况、岩溶水系统进行分析研究,论证了水库潜在的三条岩溶渗漏途径均不会发生渗漏;并利用库区降雨量与泉流量进行水均衡计算,计算结果进一步论证了该水库不存在岩溶渗漏问题。     

重庆走马岭岩溶隧道涌水量初步研究

隧道涌水问题普遍存在,从隧道的施工到竣工运行都受其影响,特别是在南方岩溶地区尤为严重。根据勘察资料,走马岭隧道穿越可溶岩段(含断层破碎带)长1525m,占隧道总长的62%,极易发生隧道涌水事故。本文结合已开挖段隧道涌水的实时监测数据及前期工程勘察资料,对隧道涌水做出初步预测评价,为以后的施工提供依据。     

深圳市地理信息产业政策研究及建议

深圳市2014年地理信息产业调查估算产值为50-60亿元,产业发展潜力具有很大的挖掘空间。有效的产业政策可以促进产业发展。为加快深圳地理信息产业发展,本文在对深圳市现有地理信息产业政策体系进行全面梳理和政策问题分析的基础上,开展促进深圳市地理信息发展的产业政策研究,提出深圳市地理信息产业优先发展方向、领域,并基于地理信息产业政策研究理论框架,给出具有针对性的政策完善建议。     

海水网箱养殖石斑鱼病原菌研究

从网箱养殖的石斑Ｅｐｉｎｅｐｈｙｅｌｕｓｓｐ．中分离出一种致病菌——创伤弧菌Ｖｉｂｒｉｏｖｕｌｎｉｆｉｃｕｓ。本文报道该病原菌的分离、形态、毒力、生理生化特性。该菌毒力较强，感染死亡率可达８０％以上。     

Dynamical model of binary asteroid systems using binary octahedrons

We used binary octahedrons to investigate the dynamical behaviors of binary asteroid systems. The mutual potential of the binary polyhedron method is derived from the fourth order to the sixth order. The irregular shapes, relative orbits, attitude angles, as well as the angular velocities of the binary asteroid system are included in the model. We investigated the relative trajectory of the secondary relative to the primary, the total angular momentum and total energy of the system, the three-axis attitude angular velocity of the binary system, as well as the angular momentum of the two components. The relative errors of the total angular momentum and the total energy indicate that the calculation has a high precision. It is found that the influence of the orbital and attitude motion of the primary from the gravitational force of the secondary is obvious. This study is useful in understanding the complicated dynamical behaviors of the binary asteroid systems discovered in our Solar system.     

Ecosystem health assessment of Honghu Lake Wetland of China using artificial neural network approach

Honghu Lake, located in the southeast of Hubei Province, China, has suffered a severe disturbance during the past few decades. To restore the ecosystem, the Honghu Lake Wetland Protection and Restoration Demonstration Project (HLWPRDP) has been implemented since 2004. A back propagation (BP) artificial neural network (ANN) approach was applied to evaluatinig the ecosystem health of the Honghu Lake wetland. And the effectiveness of the HLWPRDP was also assessed by comparing the ecosystem health before and after the project. Particularly, 12 ecosystem health indices were used as evaluation parameters to establish a set of three-layer BP ANNs. The output is one layer of ecosystem health index. After training and testing the BP ANNs, an optimal model of BP ANNs was selected to assess the ecosystem health of the Honghu Lake wetland. The result indicates that four stages can be identified based on the change of the ecosystem health from 1990 to 2008 and the ecosystem health index ranges from morbidity before the implementation of HLWPRDP (in 2002) to middle health after the implementation of the HLWPRDP (in 2005). It demonstrates that the HLWPRDP is effective and the BP ANN could be used as a tool for the assessment of ecosystem health.     

广西军事体育学校膨胀岩山体滑坡整治的反思

膨胀岩（土）病害是一种特殊的工程地质现象。文章通过对广西军体校膨胀岩山体滑坡的整治经验进行总结,探讨其成因机理,提出对整治设计的一些看法     

柳江流域冲积型粉质粘土的物理特征

通过收集数年工程地质勘察土工试验资料、获得了柳江流域ⅡⅢ级阶地的粉质粘土的大量实验数据。运用数理统计的方法、分析归纳出这一地带粉质粘土的基本物理特征。