高校图书馆对吉林经济发展的作用研究

高校图书馆对吉林经济的振兴和腾飞具有举足轻重的作用,突出图书馆社会职能,使其巨大的信息资源优势在社会经济发展中起到积极地推动作用。     

Amplification,Sequence Analysis and Tissue Expression Detection of FUT2 Gene Coding Regions of Dongchuan Pigs

Porcine alpha (1,2) fucosyltransferase (FUT2) gene was importance in glycosphingolipid biosynthesis-globo series, potentially played a regulatory role during Escherichia coli (E. coli) F18 infection process in weaned piglets. In order to explore sequence structure of porcine FUT2 gene and its biological function, this test amplified FUT2 gene CDS sequence of Dongchuan pigs by PCR, forecasted and analyzed the protein sequences and functional regions of FUT2 gene, its expression level was detected in 11 tissues of 8 Dongchuan weaned piglets in 35 days old at the meantime. The results showed that the CDS sequence of FUT2 gene was 1 023 bp, which encoded 340 amino acids. FUT2 protein was fat-soluble hydrophilic protein, which the structure was not stable, including a transmembrane helix structure, but without signal peptide that suggested the FUT2 protein was a membrane protein;FUT2 protein included 2 N-glycosylation sites (No. 185 and No. 305 amino acids), without O-glycosylation sites, there were 14 potential phosphorylation sites, included 6 Ser, 2 Thr and 6 Tyr, analyzing the functional regions found that the FUT2 protein had a superfamily of conserved domains:FUT1-FUT2-like (58-319 amino acids). The phylogenetic tree result showed that the relative relationship between swine and cattle was relatively close, but was distant from chimpanzee, human, mouse and rat. FUT2 gene was expressed in all 11 tissues of Dongchuan weaned piglets, there were higher expression in digestive tract and immune tissues. The present results suggested that FUT2 gene might play a role to resistance to E. coli F18 in weaned piglets, and might indirectly against E. coli F18 through the synthesis of fucosyltransferase.     

基于Translog生产函数的北京市西瓜最优种植规模研究

农业适度规模经营是未来农业的发展方向,本文以规模经济理论为基础,通过建立Translog生产函数模型和DEA包络分析法,最终得出以农户为经营主体的北京市西瓜最优种植规模为6670m2(10亩)。除此之外,研究还发现种植户年龄及文化程度对西瓜种植具有显著影响,但随着农村人口老龄化日趋严峻,培养新型职业农民可以衔接西瓜种植的"断层"。     

镉污染土壤亚麻替代种植的经济和生态效果研究

为研究镉污染土壤亚麻替代种植的经济、生态效益，对浏阳市永和镇佳成村镉污染土壤的下大屋组、新建组等2个试验点的亚麻农艺性状和土壤、植株中重金属进行了研究。结果表明，内亚9号株高在79.20 cm以上，最高可达108.94 cm，工艺长度62.52 cm以上，茎粗最高达3.50 mm，原茎产量最高为4337.81 kg/hm2，种子产量468.07 kg/hm2。在重金属镉吸收方面，镉富集系数较高，最高可达6.752，表明内亚9号有着良好的吸收土壤重金属镉的能力，每亩可获纯收益1025.47元。综上，亚麻在镉污染土壤种植的经济和生态效果较好。     

沙门菌CRISPR的结构与功能研究进展

近年发现沙门菌中恒定地存在两个CRISPR位点,沙门菌利用它们不仅能抵御外源质粒和噬菌体的入侵,还能介导自身短期的表型变化及长期亚类的进化。同时由于其结构的多样性,使之广泛应用于沙门菌分型和进化的研究。论文简要综述了沙门菌CRISPR系统的基本结构、作用机制和功能及其在沙门菌分型和进化应用方面的研究进展。     

土壤耕层深度和施肥深度对桔梗根部主要农艺性状的影响

[目的]探索优质高产的桔梗栽培方法。[方法]在15、20、30、40cm的耕深和不施肥、全层施肥、深层施肥（30～40cm）的3个施肥深度条件下,调查桔梗根的主要农艺性状。[结果]在耕深试验中,30cm耕深条件下的主根长最长、根粗最粗、单根鲜重最重,但侧根数也最多;施肥效果为深层施肥的效果好于全层施肥和不施肥。[结论]试验结果对山区、半山区桔梗栽培体系的建立有一定的参考价值。     

几类叶面肥对金华大白桃果实经济性状的影响

[目的]筛选有助于增进金华大白桃品质的叶面肥和生长调节剂。[方法]研究7种叶面肥和生长调节剂对金华大白桃果实主要经济性状以及生长发育的影响。[结果]幼果期适时喷施福施壮和S-诱抗素后,大白桃单果重、可溶性固形物含量等果实主要经济性状显著高于对照,并明显优于其他处理。活清浇施处理明显提高了金华大白桃的品质。[结论]喷施福施壮、S-诱抗素和浇施活清对提高金华大白桃品质作用明显,适合在生产上推广应用。     

不同桉树在昆明市海口林场的早期生长研究

对昆明市海口林场2012年栽植的5种桉树早期生长性状进行了观测研究。结果发现，5种桉树中，造林成活率较高的有本沁桉、邓恩桉及多利桉，树高和地径表现最优的是多利按。不同种桉树中苗圃地生长表现最优的，上山栽植以后生长表现不一定最优，这与不同生长发育阶段、不同环境条件有着密切关系。     

加快非公有制林业发展，建立生态保障体系的几点思考

该文紧紧围绕生态建设这一主题,总结了白城市洮北区非公有制林业发展的基本情况和有效经验,分析了制约林业发展的主要因素,从实现林业投资主体多元化,鼓励全社会关注林业、投资林业,做好技术服务,加大资金投入等方面促进非公有制林业的持续发展,实现全区经济的又好又快发展。