排序方式: 共有69条查询结果,搜索用时 15 毫秒
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普氏原羚(Procapra przewalskii)是青藏高原特有物种, 为了掌握该物种的分布和种群状况, 我们于2014-2015年采用全面调查和直接计数的方法, 对普氏原羚的分布、种群和保护现状进行了调查。结果如下: 普氏原羚分布在青海湖周边12个隔离的分布点, 与全国第一次野生动物资源调查的结果相比, 有多个新的分布点被发现, 分布范围和面积扩大; 调查共发现1,238只普氏原羚, 与2010年以后的调查结果相比, 种群数量维持在一个稳定的水平。然而, 仅有4个分布点位于青海湖国家级自然保护区范围内。尽管刚察县成立了青海湖普氏原羚特护区, 天峻县成立了普氏原羚自然保护站, 但现有的管护力度仍然不够, 且缺乏系统的管理规划。我们建议在天峻县布哈河上游的生格-快尔玛地区成立普氏原羚自然保护区; 同时建立适当的生态补偿机制, 协调保护与社区发展的矛盾; 鉴于目前圈养种群发展迅速, 建议在历史分布区选取合适的地点进行人工繁育个体的迁地放归。 相似文献
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Jun Zhou Songhua ZhanWenli Tan Ruixin ChengHangjun Gong Qiong Zhu 《Biochemical and biophysical research communications》2014
MTA2 is a member of metastasis associated family, which is highly expressed in several solid tumors and associated with tumor cells migration and invasion. Here, we report that MTA2 is acetylated at K152 and histone acetyltransferase p300 binds to and acetylates MTA2. Furthermore, mutation of the MTA2 acetylation site inhibits the growth of colorectal cancer cells and migration and invasion of Rat1 fibroblasts. These results reveal a novel post-translational regulation of MTA2 by the way of p300-dependent acetylation, which is important for tumor cells growth and migration and provides a potential target for clinical cancer research. 相似文献
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亚麻遗传多样性的RAPD分析 总被引:2,自引:0,他引:2
从600个随机引物筛选出28个扩增稳定性较好的引物,对18份来自不同国家和地区的亚麻资源遗传多态性进行RAPD分析。结果表明:共扩增出条带529,其中多态性条带201,总的多态性百分率(PPB)为38.0%。用NTSYSpc(2.10)软件进行UPGMA聚类分析,18个亚麻品种遗传距离为0.0469~0.1332之间,可分3大类,其中红木5号与匈牙利5号亲缘关系最近,ABYSSINIA(BROWN)和匈牙利5号遗传距离相差最显著,达到0.1332。 相似文献
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利用传统微生物筛选方法,从动物粪便中经过酸性平板初筛、中性平板复筛,得到一株产酸性脲酶的菌株JN_R12。通过比较形态特征、生理生化以及16S rDNA测序结果,结合系统发育分析,确定该菌为肠出血性大肠埃希氏菌Enterohemorrhagic Escherichia coli O157:H7。JN_R12所产脲酶对酒精有较好的耐受性。离心后得到的全细胞在模拟酒样中的尿素去除率接近100%;黄酒中24h孵化后的去除率在60%以上。 相似文献
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Yale Image Finder (YIF) is a publicly accessible search engine featuring a new way of retrieving biomedical images and associated papers based on the text carried inside the images. Image queries can also be issued against the image caption, as well as words in the associated paper abstract and title. A typical search scenario using YIF is as follows: a user provides few search keywords and the most relevant images are returned and presented in the form of thumbnails. Users can click on the image of interest to retrieve the high resolution image. In addition, the search engine will provide two types of related images: those that appear in the same paper, and those from other papers with similar image content. Retrieved images link back to their source papers, allowing users to find related papers starting with an image of interest. Currently, YIF has indexed over 140 000 images from over 34 000 open access biomedical journal papers. AVAILABILITY: http://krauthammerlab.med.yale.edu/imagefinder/ 相似文献
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