The conventional silk fibroin(SF)films obtained by casting from SF aqueous solution are amorphous,and easily dissolved in water.This defect limits the practical use of SF films in biomedical field.A new water-insolubl...The conventional silk fibroin(SF)films obtained by casting from SF aqueous solution are amorphous,and easily dissolved in water.This defect limits the practical use of SF films in biomedical field.A new water-insoluble silk fibroin film(an SF-FA film)could be simply prepared by casting from SF formic acid solution.The physical properties and moisture permeability of SF-FA films were examined.The results show that the SF-FA film swollen in water exhibits outstanding pliability.The weight loss of SF-FA films in water is also very little.The unique physical properties for the SF-FA film in the wet relate to the intrinsic structure of the fibroin film.The cell viability of rat embryo dermal fibroblasts seeded on the control films and the SF-FA films was evaluated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT)assay.Results show that the optical density(OD)value of the SF-FA film is almost the same as that of the conventional SF film treated with alcohol,therefore,the SF-FA film has good cell compatibility.In addition,the SF-FA film is also a biodegradable material.Because of their good transparency,it is helpful in study of clinical experiment with the SF-FA films.展开更多
Silk fibroin/cellulose blend films were prepared using N-methylmorpholine -N-oxide (NMMO) as solvent. The effects of different proportions and solid contents on properties of blend films were discussed. The mechanical...Silk fibroin/cellulose blend films were prepared using N-methylmorpholine -N-oxide (NMMO) as solvent. The effects of different proportions and solid contents on properties of blend films were discussed. The mechanical properties showed that the blend films had preferable moisture permeability and a high strength. The structures of the blend films were investigated by infrared spectrum and X-ray diffraction. The results indicated the occurrence of hydrogen bonds between hydroxyl groups of cellulose and amido groups of fibroin.展开更多
When visiting Kazakhstan,President Xi Jinping proposed the strategic project to build the＂ Silk Road economic zone＂ . Under this background,the study of postgraduate students＇ English teaching is very important.Thi...When visiting Kazakhstan,President Xi Jinping proposed the strategic project to build the＂ Silk Road economic zone＂ . Under this background,the study of postgraduate students＇ English teaching is very important.This paper analyzes the historical status of the Silk Road,the significance of culture teaching of Silk Road countries,presents the study of the main elements and its implementation approaches of the Silk Road culture teaching in postgraduate students＇ English class,with the purpose of making more educators to participate in the＂ Silk Road economic zone＂ construction.展开更多
"Road of the Silk Kingdom: 5000 Years of Chinese Silk", an important event in the Year of China, was on display from July 2 in Khabarovsk, Kazan and Moscow respectively.
Silks are among the most precious ancient and historic artefacts worldwide. While washing removes the natural gum from the fibres during the fabrication of most silk textiles, for a small proportion of historic silks ...Silks are among the most precious ancient and historic artefacts worldwide. While washing removes the natural gum from the fibres during the fabrication of most silk textiles, for a small proportion of historic silks some or perhaps all of the sericin still remains. This paper investigated the effect of sericin coating on the aging of silk fibroin by means of ATR and tensile testing. The results show that sericin can provide some extent of protection from light and heat aging. However, in high humidity environments degummed and ungummed silk aged at the same rate because of leaching of sericin. Silk degraded at faster rate and more extensively in a moist environment. ATR could give very useful information about the aging of silk. The ATR-derived crystallinity index is good at tracing the aging factor and extent of silk deterioration. Alanine and tyrosine within fibroin, as estimated by ATR spectroscopy, are very sensitive to light, but not to heat and water. The ATR absorbance intensity ratio Iamide Ⅲ/ Iamide I is very useful for deterioration evaluation of archaeological silk objects. As a high humidity resulted in the leaching of silk, it is suggested for sericin-coated silk in collections, that not only wet cleaning is harmful, but also that storage or display in a high RH environment would be detrimental.展开更多
基金National Programon Key Basic Research Project of China(973program)(No.2005CB623906)
文摘The conventional silk fibroin(SF)films obtained by casting from SF aqueous solution are amorphous,and easily dissolved in water.This defect limits the practical use of SF films in biomedical field.A new water-insoluble silk fibroin film(an SF-FA film)could be simply prepared by casting from SF formic acid solution.The physical properties and moisture permeability of SF-FA films were examined.The results show that the SF-FA film swollen in water exhibits outstanding pliability.The weight loss of SF-FA films in water is also very little.The unique physical properties for the SF-FA film in the wet relate to the intrinsic structure of the fibroin film.The cell viability of rat embryo dermal fibroblasts seeded on the control films and the SF-FA films was evaluated by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide(MTT)assay.Results show that the optical density(OD)value of the SF-FA film is almost the same as that of the conventional SF film treated with alcohol,therefore,the SF-FA film has good cell compatibility.In addition,the SF-FA film is also a biodegradable material.Because of their good transparency,it is helpful in study of clinical experiment with the SF-FA films.
文摘Silk fibroin/cellulose blend films were prepared using N-methylmorpholine -N-oxide (NMMO) as solvent. The effects of different proportions and solid contents on properties of blend films were discussed. The mechanical properties showed that the blend films had preferable moisture permeability and a high strength. The structures of the blend films were investigated by infrared spectrum and X-ray diffraction. The results indicated the occurrence of hydrogen bonds between hydroxyl groups of cellulose and amido groups of fibroin.
文摘When visiting Kazakhstan,President Xi Jinping proposed the strategic project to build the＂ Silk Road economic zone＂ . Under this background,the study of postgraduate students＇ English teaching is very important.This paper analyzes the historical status of the Silk Road,the significance of culture teaching of Silk Road countries,presents the study of the main elements and its implementation approaches of the Silk Road culture teaching in postgraduate students＇ English class,with the purpose of making more educators to participate in the＂ Silk Road economic zone＂ construction.
文摘"Road of the Silk Kingdom: 5000 Years of Chinese Silk", an important event in the Year of China, was on display from July 2 in Khabarovsk, Kazan and Moscow respectively.
文摘Silks are among the most precious ancient and historic artefacts worldwide. While washing removes the natural gum from the fibres during the fabrication of most silk textiles, for a small proportion of historic silks some or perhaps all of the sericin still remains. This paper investigated the effect of sericin coating on the aging of silk fibroin by means of ATR and tensile testing. The results show that sericin can provide some extent of protection from light and heat aging. However, in high humidity environments degummed and ungummed silk aged at the same rate because of leaching of sericin. Silk degraded at faster rate and more extensively in a moist environment. ATR could give very useful information about the aging of silk. The ATR-derived crystallinity index is good at tracing the aging factor and extent of silk deterioration. Alanine and tyrosine within fibroin, as estimated by ATR spectroscopy, are very sensitive to light, but not to heat and water. The ATR absorbance intensity ratio Iamide Ⅲ/ Iamide I is very useful for deterioration evaluation of archaeological silk objects. As a high humidity resulted in the leaching of silk, it is suggested for sericin-coated silk in collections, that not only wet cleaning is harmful, but also that storage or display in a high RH environment would be detrimental.
