The authors focus on how to segment semantic units in Chinese discourse and how to label relations among semantic units automatically. During the parsing process, several sequence labelling methods are compared for discourse segmentation, while a maximum entropy-based training and decoding algorithm is specially proposed. Experiments are done based on Tsinghua Chinese Treebank, which is annotated with logical and semantic relations at complex-sentence level. Experimental results show that F-score of discourse segmentation reaches 89.1%. When parsing discourses with no more than 6 relations included, the labeling F-score can achieve 63%.

Single hydrogen-doped endohedral fullerene H@C₆₀ and exohedral fullerene cation HC₆₀⁺ are investigated via semiempirical and first principles calculations. The most stable configuration of H@C₆₀ corresponds to the H atom on the center of the C₆₀ cage, a result consistent with the recent Bingel transformation experiments. The geometry of HC₆₀⁺ is quite similar to its neutral species. Its electronic structure is characterized by a strong localization of the LUMO on the dopant H site and a half-reduced HOMO-LUMO energy gap relative to that of C₆₀.The agreement between the calculated and observed electronic spectra of HC₆₀⁺ confirms its oxidation state in solution.

Two isoforms metallothioneins: Zn₇MT-Ⅰ and Zn₇MT-Ⅱ were prepared from the rabbit liver induced by zinc after isolation and purification. They were demetalled in acidic condition, then applied Sephadex G-25 to gain apoMTs free of metals. In a similar way, Zn₂Cd₅MT-Ⅰ and Zn₂Cd₅MT-Ⅱ were prepared from the rabbit liver induced by cadmium. By using Circular Dichroism (CD) spectroscopy method and Ultraviolet (UV) absorption spectrophotometry, competition reaction and replacement reaction of metallothioneins with lead ion were investigated. Competition reaction shows that ZnPbMT-Ⅰ is formed while lead ion and zinc ion bind competitively to apoMT-Ⅰ；however, apoMT-Ⅱ's metal binding sites are all took up by lead ion, which means apoMT-Ⅱ is more sensitive to lead ion than apoMT-Ⅰ. Replacement reaction shows that lead ion can't replace zinc ion either in Zn₇MT-Ⅰ or in Zn₇MT-Ⅱ; on the contrary, lead ion can replace zinc ion both in Zn₂Cd₅MT-Ⅰ and in Zn₂Cd₅MT-Ⅱ；moreover, these two isoforms Zn₂Cd₅MTs display differences in replacement reaction. It suggests Zn₂Cd₅MT-Ⅱ may detoxify lead effectively.