The prototype theory holds that there are disease prototypes with a series of representative characteristics in the memory of doctors, and clinical disease diagnosis is mainly based on the similarity with these disease prototypes. The case-based teaching method based on prototype theory can facilitate the medical students to create disease prototypes in their memory, thereby enhancing their clinical reasoning ability. Prototype creation and prototype learning based on prototype resemblance theory can be used in artificial intelligence-assisted teaching. The example theory can make up for the loss of specific information during prototype construction. The application of prototype theory must be combined with the practice of medical teaching in China, and the development of clinical reasoning education based on prototype theory is an important research direction in the future.

The prototype theory holds that there are disease prototypes with a series of representative characteristics in the memory of doctors, and clinical disease diagnosis is mainly based on the similarity with these disease prototypes. The case-based teaching method based on prototype theory can facilitate the medical students to create disease prototypes in their memory, thereby enhancing their clinical reasoning ability. Prototype creation and prototype learning based on prototype resemblance theory can be used in artificial intelligence-assisted teaching. The example theory can make up for the loss of specific information during prototype construction. The application of prototype theory must be combined with the practice of medical teaching in China, and the development of clinical reasoning education based on prototype theory is an important research direction in the future.

From the perspective of doctor-patient relationship, this paper put forward the external and internal paths led by the social atmosphere value of respecting medicine and health. The external path is that lead the mass media and publicize positive public opinion; popularize medical knowledge and narrow the distance between doctors and patients; strengthen humanistic care and relieve psychological stress; establish positive models and carry forward advanced deeds; increase salary packages and embody labor value; improve the practice environment and implement safety initiatives. The internal path is that strengthen professional ability and improve professional quality; improve communication skills and enhance mutual understanding; pay attention to psychological counseling and psychological protection; establish prevention awareness and protect personal safety; strengthen professional belief and create an atmosphere of respecting doctors, so as to make respect for medicine and health become common practice.

AIM　To study the structural characterization of an acidic polysaccharide, H3, isolated from the seeds of Cuscuta chinensis Lam. METHODS　Both chemical (such as sugar component analysis, methylation analysis, reduction of uronic acid, partial acidic hydrolysis, etc.) and spectral analysis (1HNMR, 13CNMR, IR, etc.) were used to investigate the structural characterization of H3. RESULTS　The molecular weight of H3 was estimated to be more than 1.0×106. The analytical results of sugar components indicated that H3 composed of Rha, Ara, Gal, and Gal A. Methylation analysis, partial acidic hydrolysis and 1H, 13CNMR further identified the linkages and sequence of the residues of H3. CONCLUSION　These results suggest that H3 is a highly branched heteropolysaccharide with structure elucidation for the first time.

Object To study the polysaccharides from Salvia chinensis Benth. Methods DEAE-cellulose and gel-filtration chromatography were used to isolate and purify the polysaccharides whose structures were characterized by using chemical and spectral methods. Results Two homogeneous polysaccharides,named SC5 and SC6,were obtained from the water and diluted-alkaline extract,respectively,with their molecular weights estimated by HPGPC to be 4.8?10 4 and more than 1.0?10 6. Both structures were investigated to be complicated acidic polysaccharides. Conclusion The two polysaccharides are obtained for the first time from this plant.

Object Polysaccharide constituents in the seed of Cuscuta chinensis Lam were investigated Methods Individual constituent was isolated and purified by DEAE cellulose and gel filtration chromatography, and its structural features were further studied by physicochemical constants, and spectral analysis Results Two polysaccharides, named H6 and H8, were obtained from alkalescent or boiling water extract fractions, respectively The molecular mass of H6 was 3 14?10 5 and that of H8 was more than 1 0?10 6 Both structures were found to be complex neutral heteropolysaccharides composed of Ara, Rha, Gal and Xyl Conclusion These polysaccharides were obtained from this plant for the first time