达里诺尔湖湿地生态系统服务价值评价

生态系统服务功能是生态系统与生态过程所形成及所维持的人类赖以生存的自然环境条件与效用,对其服务价值进行货币化评价,可以推动自然资源可持续利用,促进区域生态环境保护。以达里诺尔湖湿地为研究对象,结合达里诺尔湖湿地生态系统的结构、特征及其生态过程特点,通过资料搜集与实地调研,运用资源经济学理论和方法,对达里诺尔湖湿地生态系统服务价值进行了划分。构建了达里诺尔湖湿地生态系统服务价值评价指标体系,并对其进行了价值评价。评价结果显示达里诺尔湖湿地的服务价值为93.70×10⁴万元,其中直接使用价值为2.19×10⁴万元,占比为2.36%,间接使用价值为91.51×10⁴万元,占比为97.66%。各项生态系统服务功能中以调节空气湿度价值最大,为82.76×10⁴万元,占总服务价值的88.32%。     

以读书沙龙为载体推进大学文化建设——以黑龙江八一农垦大学图书馆为例

以黑龙江八一农垦大学图书馆读书沙龙为例,对读书沙龙的主题选择、现场组织和宣传报道等进行总结分析,阐述读书沙龙为大学文化建设带来的影响,并对办好读书沙龙活动提供了一些新的思路.     

干旱胁迫下杠柳种子萌发期保护酶活性及丙二醛含量变化

用含有5种不同质量分数PEG-6000的1/2 Hoagland溶液模拟干旱胁迫,研究杠柳种子萌发期的过氧化物酶(POD)活性和丙二醛(MDA)含量的变化。结果表明,随着干旱胁迫程度的增加,POD活性整体呈现增长趋势,说明低质量分数PEG能够刺激诱导自由基清除系统中POD活性的增加;MDA含量随PEG质量分数的升高而增长,说明干旱胁迫程度增加使种子内活性氧的量增加,膜质过氧化程度随之增加,产物MDA含量升高;在PEG质量分数为25%时,POD活性降低,MDA含量明显增加,说明干旱胁迫增加到一定程度时,POD活性会受到抑制,活性氧的量增加,膜的受损程度增加。     

马铃薯脱毒快繁中的培养基元素组成及成本

马铃薯脱毒快繁技术繁殖倍数高,周期短,短时间内就可获得大批量马铃薯试管苗,但是脱毒快繁的成本比较高。如果在快繁的同时,保证质量的前提下,能节约成本,那对于马铃薯试管苗的工厂化生产是很有利的,也能大幅度提高其经济效益。     

Infections Investigation of ALV and REV in Guangxi Local Poultry Breeds and Sequence Analysis of gp85 Gene of ALV Isolates

In order to investigate the infection status of avian leukosis virus (ALV) and avian reticuloendotheliosis virus (REV) in the major local breeds of Qinzhou,Guangxi,totally 953 samples of egg white,cloaca swab and serum of Ma duck,Shitou goose,Tiejiao-Ma chicken,turkey and pigeon were collected from the representing flocks and detected by the commercial ELISA kits.ALV was isolated for the ALV p27 positive samples by culturing on DF-1 cells,and gp85 gene was sequenced.The results showed that the detections of ALV were negative in the samples except those of Tiejiao-Ma chicken,while REV antibody was found positive in Ma duck,Tiejiao-Ma chicken and turkey.The nucleotide sequences of gp85 gene of two isolates shared 94.5% identity with each other,and shared 86.9% to 94.9% with reference strains.The amino acid sequences of gp85 gene of two isolates shared 91.5% identity with each other,and shared 84.0% to 91.6% with reference strains.There were many variable sites in the hyper variable region hr1 and hr2,and the vr2 and vr3 variable regions were relatively conservative.Phylogenetic tree analysis showed that the two isolates shared the highest homology with SCAU11-XG strain.     

Analysis on Target Genes with Mutation in microRNA of Blue-shelled Chicken and White Leghorn

The study was conducted to explore the potential different characters between Blue-shelled chicken and White leghorn.Global genome microRNA was combined the identified microRNA with complementary lab-predicted microRNA.Then the two breed chicken's SNP data got by GGRS were mapped to the microRNA and focused on SNP that deliberately located in mature-microRNA.Bioinformatics method was adopted for target prediction on microRNA which had SNPs.By further gene enrichment analysis,the study found these genes enriched in 22 GO terms,10 KEGG pathways,and 3 IPA important networks.And they enriched in traits which associated with growth,such as mTOR signaling pathways,Wnt signaling pathways,growth hormone receptor networks and insulin-like growth factor Ⅰ receptor networks.And they also enriched in some laying traits,such as oocyte meiotic signaling pathways and progesterone mature oocytes signaling pathways.The methods and the results might provide references for further studies.     

美国油气管道基本失效概率评估方法及启示

为充分利用油气管道历史失效数据,减少失效概率评估过程中的主观性,提出油气管道基本失效概率的概念及评估方法。对美国管道及危险物品安全管理局数据库的油气管道里程数据、事故数据及失效因素数据进行全面分析,采用基于事故统计的方法评估油气管道基本失效概率。结果表明:美国危险液体管道、输气集气管道、配气管道发生一般事故的基本失效概率分别为1.29次/(10^3 km·a)、2.17次/(10^4 km·a)及4.08次/(10^5 km·a),发生较大事故的基本失效概率分别为4.58次/(10^4 km·a)、1.41次/(10^4 km·a)及2.38次/(10^5 km·a),发生重大事故的基本失效概率分别为9.09次/(10^6 km·a)、9.79次/(10^6 km·a)及1.11次/(10^5 km·a)。美国基本失效概率可作为油气管道失效概率评估的基准线,也可作为风险可接受标准的依据,但不能直接应用于中国管道风险评价,需对其进行修正,建立适用于中国管道的失效数据库。