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本文探讨了遥感技术在城市规划中的应用及发展。从遥感信息在城市用地调查中的应用、在城市规划管理中的应用以及城市环境遥感监测分析,三方面论述并进一步探讨其在城市规划中的应用前景。 相似文献
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阐述了纳米技术在蜂胶、蜂毒和蜂蜡等蜂产品中的研究进展和应用前景,并简述了纳米技术在蜂产品应用中的潜在危害。 相似文献
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微生态制剂在肉鸡生产中的应用 总被引:1,自引:0,他引:1
笔者对我国肉鸡的生产特点进行了分析,并对微生态制剂在肉鸡生产中的作用进行了阐述,还对微生态制剂在肉鸡生产中的应用需求、应用时机、应用方法、注意事项等方面进行了分析和总结. 相似文献
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在兽医临床领域应用到了很多中药,各种不同种类的中药具有提高机体免疫力、抗真菌、抗病毒、抗细菌的作用,在兽医临床中应用合适的中药往往能够取得良好的治疗效果。对中药在兽医临床中的应用研究进行了综述,并探讨了中药在兽医临床中的应用前景。 相似文献
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For over a decade, molecular short standardised DNA fragments, termed DNA barcodes, have been developed for species discrimination around the world. As of 2010, the vast majority of barcoding research was biased toward particular taxonomic groups and geographic regions largely because researchers in developed countries were the ones with the resources and capacity to carry out such work. To rectify this, the International Barcode of Life Project was launched with the intent to extend the geographic and taxonomic coverage of the barcode reference library. South Africa committed to this mission in an attempt to catalogue all of its known biodiversity and, possibly, help identify new species. To date, approximately 48 000 South African faunal barcodes are housed in the Barcode of Life Data System (BOLD), which represent only 2.3% of all known South African animal species. Although insects are the best represented in absolute terms, with over 37 000 samples recorded, they are still grossly lacking with just over 1% representation. Much like the global trend, there is a general taxonomic bias, with fish, birds and mammals showing the greatest representation. Moreover, geographic bias is also present, with the Free State province particularly under-represented on BOLD, likely owing to limited human capacity. Although few studies have been published with respect to barcoding, the majority reveal that the cytochrome c oxidase 1 (CO1) gene, used in isolation or in conjunction with other molecular markers, can greatly benefit South African biodiversity research. Several limitations of DNA barcoding are discussed and recommendations specific to South Africa provided. 相似文献
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樗蚕(Philosamia cynthia cynthia)与蓖麻蚕(Philosamia cynthia ricini)均是鳞翅目大蚕蛾科吐丝营茧的昆虫,二者的血缘关系很近,成虫的外形也极其相似。为了获得用于樗蚕与蓖麻蚕分子鉴定的DNA条形编码,测定了二者的线粒体细胞色素酶C亚基I基因(COI)574 bp的DNA片段序列(GenBank登录号:FJ788507,FJ772004),对序列特征及与同科其它绢丝昆虫同源序列的系统进化关系进行了分析。在大蚕蛾科绢丝昆虫中,樗蚕与蓖麻蚕COI序列表现出最强的碱基T偏好性(ATskew=-0.194),二者的COI序列之间具有明显差异,共鉴定出25个变异位点,表明所测定COI序列可以作为各自的DNA条形编码。樗蚕与蓖麻蚕之间基于Kimura-2-Parameter的遗传距离为0.041,而与同科其它绢丝昆虫之间的遗传距离则在0.076~0.159之间,二者与惜古比天蚕(Hyalophora ce-cropia)之间的亲缘关系较近。 相似文献
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穿膜肽自发现以来,因其独特的蛋白转导功能,为基因治疗和新型疫苗的开发等开辟了新的途径。通过综述穿膜肽的种类、结构特点、作用机制及其在疫苗中的应用,为进一步研发DNA疫苗和肿瘤疫苗奠定基础。 相似文献
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The work conducted so far in this laboratory has demonstrated the application of the use of genes encoding lymphocyte differentiation molecules, in the isolation of homologous genes from other mammalian species, by the technique of cross-species DNA hybridization. The studies have also highlighted the use of transfection as a means of obtaining expression of genes, either from total genomic DNA or cloned in plasmids, which encode lymphocyte antigens. Preliminary work presented in this paper demonstrates the application of these technologies in the isolation and expression of genes for lymphocyte antigens from species in which the gene products have not been fully defined. We favour this approach because it may allow isolation and definition of important immunological molecules independently of the existence of specific antibodies. It therefore seems the most direct way to avoid the frustrating randomness in production of anti lymphocyte subset-specific monoclonal antibodies, and to shorten the time and effort needed to define the specificities of such reagents. Furthermore, the cDNA clones isolated from alternate species (in this case the bovine) have a use in classical immunological studies apart from the application of antibodies made to their products in veterinary immunology. That is, comparisons of the DNA sequences of lymphocyte differentiation antigens from different species provide much important information about structural or functional elements of evolutionarily conserved proteins involved in generation of immune responses. 相似文献
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简述了DNA疫苗的研究概况,介绍了真核双表达质粒的结构特点及其在基因佐剂和二价DNA疫苗中的应用情况,总结分析了双表达质粒的优点和存在的问题,并对其今后在DNA疫苗中的研究方向和前景进行了展望。 相似文献
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以中国2个新发现鸡种资源金湖乌凤鸡、安义瓦灰鸡及地方鸡种狼山鸡为研究对象,利用DNA测序技术测定了线粒体细胞色素C氧化酶亚基Ⅰ(cytochrome c oxidase Ⅰ,COⅠ)基因序列,揭示2个新发现资源COⅠ基因的遗传多样性及其与地方鸡种的遗传关系。结果显示,选择的这段COⅠ基因序列在2个新发现资源和狼山鸡中有10个突变位点,为7个单倍型,其中有3个为特异性突变位点,5个特异性单倍型。金湖乌凤鸡、安义瓦灰鸡和狼山鸡群体内平均核苷酸多样度(Pi)分别为0.068%;0.051%和0.0369%,单倍型多样度(H)分别为0.4167、0.3030和0.9000。狼山鸡的遗传多样性大于2个新发现资源。3个地方鸡群体间的Kimura双参数遗传距离范围为-0.002~0.236;种间遗传距离小于种内遗传距离。结果表明,利用COⅠ这一特定基因的特定区段来做DNA条形编码的基础,进行不同鸡品种鉴定具有方便、快捷、经济、准确等优点,是可行和有效的。 相似文献
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牧草表观遗传学研究进展 总被引:1,自引:0,他引:1
表观遗传是指在DNA序列不变的情况下基因表达发生变化的现象。表观遗传现象与外界环境条件的变化紧密相关,它参与植物的生长发育、胁迫响应、衰老死亡等重要生命过程并在其中起到了关键作用。表观遗传学作为一门新兴学科在近20年间得到了快速发展,成为当前动植物和医学领域的研究热点。目前植物表观遗传学的相关研究主要集中在DNA甲基化、组蛋白修饰、RNA甲基化、染色质重塑和非编码RNA修饰等方面,并取得了许多重要成果。然而,相对于模式植物拟南芥和其他主要作物而言,牧草的表观遗传学研究仍处于起步阶段。因此,开展牧草表观遗传学研究对我国草牧业的可持续发展具有重要意义。本研究对表观遗传学的概念、研究方法、研究内容(包括DNA甲基化、组蛋白修饰、RNA甲基化、染色质重塑和非编码RNA修饰等)及牧草表观遗传学相关研究进行了全面总结和综述,并对表观遗传在草牧业中的发展前景进行了展望。 相似文献
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DNA疫苗的研究进展 总被引:2,自引:1,他引:1
DNA疫苗是在分子生物学技术基础上发展起来的第3代新型疫苗,已体现出其竞争优势和应用潜能。同传统的疫苗相比,DNA疫苗具有免疫效果好、生产成本低、临床应用方便等优点,但同样存在安全性的担忧。文章回顾了DNA疫苗的发展简史,阐述了DNA疫苗的免疫机理,分析了DNA疫苗研究现状,并对DNA疫苗的安全性提出了自己的观点与看法,旨在为DNA疫苗研究提供参考。 相似文献