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Amenomori M Ayabe S Bi XJ Chen D Cui SW Danzengluobu Ding LK Ding XH Feng CF Feng Z Feng ZY Gao XY Geng QX Guo HW He HH He M Hibino K Hotta N Hu H Hu HB Huang J Huang Q Jia HY Kajino F Kasahara K Katayose Y Kato C Kawata K Labaciren Le GM Li AF Li JY Lou YQ Lu H Lu SL Meng XR Mizutani K Mu J Munakata K Nagai A Nanjo H Nishizawa M Ohnishi M Ohta I Onuma H Ouchi T Ozawa S Ren JR Saito T Saito TY Sakata M Sako TK Sasaki T Shibata M Shiomi A Shirai T Sugimoto H Takita M Tan YH Tateyama N Torii S 《Science (New York, N.Y.)》2006,314(5798):439-443
The intensity of Galactic cosmic rays is nearly isotropic because of the influence of magnetic fields in the Milky Way. Here, we present two-dimensional high-precision anisotropy measurement for energies from a few to several hundred teraelectronvolts (TeV), using the large data sample of the Tibet Air Shower Arrays. Besides revealing finer details of the known anisotropies, a new component of Galactic cosmic ray anisotropy in sidereal time is uncovered around the Cygnus region direction. For cosmic-ray energies up to a few hundred TeV, all components of anisotropies fade away, showing a corotation of Galactic cosmic rays with the local Galactic magnetic environment. These results have broad implications for a comprehensive understanding of cosmic rays, supernovae, magnetic fields, and heliospheric and Galactic dynamic environments. 相似文献
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【目的】了解西藏拉萨地区牦牛链球菌的感染情况、致病性及其耐药性,为牦牛源链球菌的研究提供新的数据。【方法】对55份牦牛鼻拭子进行细菌分离培养、菌落形态观察、革兰氏染色镜检、生化鉴定、16S rRNA序列PCR扩增以鉴定分离菌的种属特性。通过人工感染试验小鼠评价分离菌的致病性,采用药敏纸片扩散法检测分离菌的耐药性。【结果】分离菌在血平板上长出灰白色、表面光滑的α溶血圆形菌落,革兰氏染色镜检呈链状排列的阳性球菌。分离菌可发酵葡萄糖、乳糖、海藻糖和山梨醇,不发酵麦芽糖和甘油,硝酸盐还原试验、靛基质试验、V-P试验和MR试验均呈阴性。经16S rRNA基因序列比对分析,确定有25株链球菌(Tibet-1～Tibet-25),检出率为45.46%(25/55),其中17株多动物链球菌,8株马链球菌。分离菌16S rRNA基因序列与NCBI上已发布的链球菌相似性在97.04%～99.77%之间,其中Tibet-1、Tibet-2、Tibet-3、Tibet-5、Tibet-9、Tibet-10、Tibet-11、Tibet-14、Tibet-15、Tibet-16、Tibet-17共11株牦牛源多... 相似文献
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