Anisotropy and corotation of galactic cosmic rays

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.     

牛乳蛋白与过敏儿童患者血清特异性IgE结合情况的检测与分析

研究牛乳蛋白过敏儿童血清中对4种主要乳蛋白过敏原的抗体特异性情况。采用间接酶联免疫吸附法测定乳过敏儿童血清中4种乳蛋白过敏原特异性IgE抗体。结果显示,乳过敏儿童血清中α-乳白蛋白和β-乳球蛋白的特异性IgE比例较高,特异性IgE阳性率分别可达44.3%和39.3%,其次α-酪蛋白和β-酪蛋白特异性IgE阳性率为31.2%和36.1%。研究结果表明,乳过敏儿童对4种乳蛋白过敏原都有一定比例的特异性IgE抗体,其中α-LA和β-LG的阳性率较高,是乳蛋白过敏儿童的主要过敏原蛋白,大部分乳过敏儿童不止对1种乳蛋白过敏。     

Spontaneous Basal cell carcinoma of the submandibular gland in a rat

At necropsy, a white nodule (about 5 × 3 mm in size) was observed in the right submandibular gland of a 10-week-old female GALAS rat. Histopathologically, oval to spindle-shaped and pale basophilic tumor cells proliferated closely, and formed variably sized foci. The nodule partially spread into or invaded the surrounding normal tissue, and necrotic foci were recognized in the tumor. Immunohistochemically, the nuclei of the tumor cells showed a diffusely positive reaction for p63, and the cytoplasm showed a diffusely positive reaction for cytokeratin and negative reaction for αSMA, vimentin, desmin and S-100. Many tumor cells were positive for PCNA. Ultrastructurally, the tumor cells contained many tonofilaments in the cytoplasm and a few desmosomes at the intercellular portion. Based on these findings, the tumor was diagnosed as a basal cell carcinoma originating from the duct in the rat submandibular gland.