In this study, the structure of polysaccharides from Chinese yam （Dioscoreae opposite ＂Qi＂） was analyzed and identified by infrared spectroscopy within an infrared spectral range of 400-4 000 cm^-1, Characteristic...In this study, the structure of polysaccharides from Chinese yam （Dioscoreae opposite ＂Qi＂） was analyzed and identified by infrared spectroscopy within an infrared spectral range of 400-4 000 cm^-1, Characteristic absorption peaks were observed at 840 cm^-1 （α-glucosidic bond）, 759.21 cm^-1 （xylose）, 830.87 cm^-1 （rhamnose）, 812.81 cm^-1, 876.60 cm^-1 （mannose） and 842.64 cm^-1 （arabinose） in infrared spectra of polysaccharides from D. opposite ＂Qi＂, indicating that D. opposite ＂Qi＂ polysaccharides exist mainly in the form of α-glucosidic bonds, including xylose, rhamnose, mannose and arabinose. The experimental results could provide the basis for quantitative analysis, development and application of polysaccharides from D. opposite ＂Qi＂.展开更多
[Objective] This study was to explore the effect of purple yam on the nutritional and physiological functions of rats.[Method] Forty SD rats were randomly divided into four groups with ten rats in each group which wer...[Objective] This study was to explore the effect of purple yam on the nutritional and physiological functions of rats.[Method] Forty SD rats were randomly divided into four groups with ten rats in each group which were reared with artificial semisynthetic feed added with 10% steamed yam powder.The four groups,the casein（CK） group which was used as the control,the purple yam（PY） group,the Tiegun yam（TY） group and common Huai yam（HY） group,were supplied with feed of equal content of energy,protein and fat.The rats were pair-fed for 56 days to observe changes of relevant nutritional and physiological indices.[Result] There were no significant differences of body weight,food conversion rate and organ indices between rats in PY group and CK group.Mean corpuscular hemoglobin in PY group was significantly lower than that in CK group;hemoglobin showed no significant difference with that in CK group;eosnophils was lower than that in CK group.Low density lipoprotein-cholesterol,total cholesterol and atherogenic index in PY group were lower than that in the other three groups;anti-atherogenic index was the highest among the four groups,while showing no significant difference;triglyceride content was lower than that in CK group.Among the antioxidant indices,the activity of catalase and superoxide dismutase were higher than that in CK group,while malondialdehyde content was lower than that in CK group.[Conclusion] Purple yam showed the trend of reducing the content of blood glucose,total cholesterol,low density lipoprotein-cholesterol,triglyceride,malondialdehyde,and raising the activity of glutathione peroxidase,superoxide dismutase and catalase,thus having certain antioxidative function.展开更多
[ Objective ] The paper was to isolate actinomycete strains with antagonistic activity against yam anthracnose from the rhizosphere soil of medicinal plants in Hainan Province, and identify its taxonomic status. [ Met...[ Objective ] The paper was to isolate actinomycete strains with antagonistic activity against yam anthracnose from the rhizosphere soil of medicinal plants in Hainan Province, and identify its taxonomic status. [ Method ] Using HV medium, actinomycete strains were isolated from the rhizesphere soil of frangipani （Plumeria rubra L. ）. The active antagonistic actinomycetes were selected by using confrontation culture method and antifimgal test of fermentation products. Ac- cording to morphology, combined with 16S rRNA gene analysis, the taxonomic status of active actinomycetes was identified. [ Result] Twelve strains of actinomyce- tes were isolated from the rhizosphere soil of medicinal plant frangipani. Strain 51173 showed significant antifungal activity against Colletotrichum gloeosporioides, which was identified to be a member of Streptomyces violaceusniger 16S rRNA gene clade. [ Conclusion] Strain 51173 showed a good application potential for bio- logical control against yam anthracnose.展开更多
文摘In this study, the structure of polysaccharides from Chinese yam （Dioscoreae opposite ＂Qi＂） was analyzed and identified by infrared spectroscopy within an infrared spectral range of 400-4 000 cm^-1, Characteristic absorption peaks were observed at 840 cm^-1 （α-glucosidic bond）, 759.21 cm^-1 （xylose）, 830.87 cm^-1 （rhamnose）, 812.81 cm^-1, 876.60 cm^-1 （mannose） and 842.64 cm^-1 （arabinose） in infrared spectra of polysaccharides from D. opposite ＂Qi＂, indicating that D. opposite ＂Qi＂ polysaccharides exist mainly in the form of α-glucosidic bonds, including xylose, rhamnose, mannose and arabinose. The experimental results could provide the basis for quantitative analysis, development and application of polysaccharides from D. opposite ＂Qi＂.
基金Supported by the Special Fund for Construction of Scientific and Technological Innovation Ability of BAAFS(KJCX201101010-22)~~
文摘[Objective] This study was to explore the effect of purple yam on the nutritional and physiological functions of rats.[Method] Forty SD rats were randomly divided into four groups with ten rats in each group which were reared with artificial semisynthetic feed added with 10% steamed yam powder.The four groups,the casein（CK） group which was used as the control,the purple yam（PY） group,the Tiegun yam（TY） group and common Huai yam（HY） group,were supplied with feed of equal content of energy,protein and fat.The rats were pair-fed for 56 days to observe changes of relevant nutritional and physiological indices.[Result] There were no significant differences of body weight,food conversion rate and organ indices between rats in PY group and CK group.Mean corpuscular hemoglobin in PY group was significantly lower than that in CK group;hemoglobin showed no significant difference with that in CK group;eosnophils was lower than that in CK group.Low density lipoprotein-cholesterol,total cholesterol and atherogenic index in PY group were lower than that in the other three groups;anti-atherogenic index was the highest among the four groups,while showing no significant difference;triglyceride content was lower than that in CK group.Among the antioxidant indices,the activity of catalase and superoxide dismutase were higher than that in CK group,while malondialdehyde content was lower than that in CK group.[Conclusion] Purple yam showed the trend of reducing the content of blood glucose,total cholesterol,low density lipoprotein-cholesterol,triglyceride,malondialdehyde,and raising the activity of glutathione peroxidase,superoxide dismutase and catalase,thus having certain antioxidative function.
基金Supported by Youth Fund Project of Hainan University ( qnjj1018)Key Discipline Grant of Crop Science of Hainan Province~~
文摘[ Objective ] The paper was to isolate actinomycete strains with antagonistic activity against yam anthracnose from the rhizosphere soil of medicinal plants in Hainan Province, and identify its taxonomic status. [ Method ] Using HV medium, actinomycete strains were isolated from the rhizesphere soil of frangipani （Plumeria rubra L. ）. The active antagonistic actinomycetes were selected by using confrontation culture method and antifimgal test of fermentation products. Ac- cording to morphology, combined with 16S rRNA gene analysis, the taxonomic status of active actinomycetes was identified. [ Result] Twelve strains of actinomyce- tes were isolated from the rhizosphere soil of medicinal plant frangipani. Strain 51173 showed significant antifungal activity against Colletotrichum gloeosporioides, which was identified to be a member of Streptomyces violaceusniger 16S rRNA gene clade. [ Conclusion] Strain 51173 showed a good application potential for bio- logical control against yam anthracnose.
