排序方式: 共有19条查询结果,搜索用时 48 毫秒
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针对S.xinjiangensis分类地位的争议,从新疆再次分离获得34株快生大豆根瘤菌,在16SrDNAPCR-RFLP分析和SDS全细胞蛋白电泳分群的基础上,进行了16SrDNA全序列相似性和DNA同源性分析.所测4个菌株和S.fredii模式菌株USDA205的16SrDNA全序列有很高的相似性.而DNA同源性分析说明新分离的菌株代表与原定的S.xinjiangensis为一个DNA同源群.其模式菌株CCBAU110与S.fredii的2株参比菌株USDA194、2048之间的DNA同源性分别为31.5%和28.7%.S.fredii的模式菌株USDA205与新分离的菌株代表及原定的S.xinjiangensis的模式菌株和2个参比菌株之间的DNA同源性为20.8%~39%,远低于70%.属于种水平上的差异.按照国际细菌分类委员会以DNA同源性≥70%且△Tm≤5℃作为定种的标准,S.xinjiangensis是Sinorhizobium属中不同于S.fredii的一个独立的种.表3参20 相似文献
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We have developed a knowledge discovery system based on high-order hidden Markov models for analyzing spatio-temporal data bases. This system, named CarrotAge , takes as input an array of discrete data – the rows represent the spatial sites and the columns the time slots – and builds a partition together with its a posteriori probability. CarrotAge has been developed for studying the cropping patterns of a territory. It uses therefore an agricultural drench database, named Ter-Uti , which records every year the land-use category of a set of sites regularly spaced. The results of CarrotAge are interpreted by agronomists and used in research works linking agricultural land use and water management. Moreover, CarrotAge can be used to find out and study crop sequences in large territories, that is a main question for agricultural and environmental research, as discussed in this paper. 相似文献
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川西高原一带黄土沉积广泛分布,研究该地区黄土-古土壤序列的容重对于理解黄土沉积过程,探讨青藏高原东部地区的环境演化具有重要意义。论文详细分析了甘孜地区末次间冰期以来的典型黄土-古土壤序列的容重变化,结果表明该区土壤容重在1.63—2.53 g?cm~(-3)变化,黄土地层中容重较大,平均为2.01 g?cm~(-3);古土壤地层中容重较小,平均为1.94 g?cm~(-3)。土壤容重与磁化率、粒度2μm组分具有很好的负相关关系,而与平均粒径、粒度63μm组分呈明显正相关,可能表明了土壤化过程和沉积过程对土壤容重的影响;进一步的环境指标相关分析表明甘孜黄土-古土壤容重可以作为西风和高原冬季风变化的替代性指标。详细研究该区黄土的容重变化将有助于深入理解区域环流的演化过程和高原内部的干旱化历史。 相似文献
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地震序列下桥梁连梁装置的防落梁效果分析 总被引:1,自引:0,他引:1
在各类地震序列中,主-余震所占比例最大。主震震级越高其余震的震级亦越高,对结构的破坏越大。桥梁结构作为重要交通枢纽工程,其在整个地震序列发生时应确保通行,起到生命线工程的作用。选用集集地震序列对桥梁结构进行非线性时程分析,发现结构在主震作用下梁墩相对位移过大、主梁发生落座,余震作用下结构有发生落梁的可能。对结构设置防落梁装置,并进行非线性时程分析,结果显示连梁装置可有效抑制桥梁上、下部结构相对位移,提高结构抗推能力与整体性,保证了结构在整个地震序列中不发生落梁震害。在抗震分析中,应考虑到强余震对结构带来的影响,保证损伤结构在地震序列中的安全。 相似文献
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Stuart Jay Deutsch Jose A. Ramos 《Journal of the American Water Resources Association》1986,22(6):967-981
Stochastic modeling of vector hydrologic sequences is examined with a general class of space-time autoregressive integrated moving average (STARIMA) models. The models describe spatial and temporal autocorrelatjon, through dependent variables lagged both in space and time. The model structures incorporate a hierarchical ordering scheme to map the vector of observations into a network configuration. The neighboring structure used introduces a physical/geographical hierarchy to enable the model identification procedures to assist in determining appropriate correlative relationships. The three-stage iterative space-time model building procedure is illustrated using average monthly streamfiow data for a four-station network of the Southeastern Hydropower System. 相似文献
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Alga-lysing bacteria have been paid much attention to in recent years. In this study, the alga-lysing strain P05 which was isolated from an immobilizing biosystem was immobilized by coke and elastic filler, forming two biological reactors. The removal efficiencies of algae, NH3-N and organic matter using the two reactors were studied. The results showed that strain P05 was an ideal algal-lysing bacteria strain because it was easy to be immobilized by coke and elastic filler which are of cheap, low biodegradability and the simple immobilization procedure. After 7 d filming, the biological film could be formed and the reactors were used to treat the eutrophic water. These two reactors were of stability and high effect with low cost and easy operation. The optimal hydraulic retention time (HRT) of each reactor was 4 h. The algae removal rates were 80.38% and 82.1% (in term of Chl-a) of coke reactor and filler reactor, respectively. And that of NH3-N were 52.3% and 52.7%. The removal rates of CODMn were 39.03% and 39.64%. The strain P05 was identified as Bacillus sp. by PCR amplification of the 16S rRNA gene, BLAST analysis, and comparison with sequences in the GenBank nucleotide database. 相似文献
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