Based on a self-consistent mean-field model, a folding form of cluster potentials has been suggested, leading to the simple parameter-free quantum tunneling calculations of various cluster decays in atomic nuclei. The mean-field-type potential provides a ground for the descriptions of both shell structure and cluster property in nuclei. The α-particle, heavier-cluster and diproton decays of even–even nuclei above magic numbers have been investigated, showing a good agreement with experimental data. The parameter-free calculation is particularly useful for the predictions of the decay properties of exotic nuclei where experimental data are scarce and self-consistent shell models have worked well.
In this study, we developed a method that can easily and accurately measure human exhaled air (eNO). The method was successfully used to measure eNO of ten adult volunteers, who had a 9-day average of 9. 4 3. 3 mug·m~(-3) (mean SD)eNO. An analysis of the data shows correlations between eNO and ultrafine particles , suggesting the inflammatory effects of ultrafine particles in healthy adults.建立了一个简易、准确的人体呼出气中NO(eNO) 测量方法,并利用该方法测量成人呼出气中NO的含量,10 名志愿者9d的NO 平均值为9.43.3mug·m~(-3).对测得的NO 值与大气颗粒物浓度进行相关性分析及回归分析,初步分析了超细颗粒物与eNO 的相关性,这些相关性说明了大气超细颗粒物对人体呼吸系统健康存在的潜在影响,而eNO 可作为这一效应的生物标记物.
A helical filamentous cyanobactericidal bacterium was isolated from Dianchi Lake, a eutrophic freshwater lake in Kunming City of the Yunnan Province in China using a special solid medium. This species was designated strain PdY3. This bacterium was identified as a novel Saprospira sp. on the basis of its morphological characteristics and 16S rDNA sequence. Strain PdY3 showed apparent group behavior on the solid medium, forming orderly, bundle-like group structures. These bundles moved as groups. Individuals in a bundle responded to the bundle as a whole. PdY3 also showed group behavior and formed a three-dimensional reticular structure when co-cultured with Anabaena in liquid media. This helical bacterium lysed cyanobacteria through direct contact and its group behavior greatly accelerated the cyanobactericidal process. Our experiments showed that PdY3 caused lysis of 64% of Anabaena cells within 1 day and that its cyanobactericidal range was broad. These results underscore potential application of Saprospira on the control of blooms of cyanobacteria. PdY3 group behavior might allow a more efficient capture of bacterial prey.