Thread-embedding materials buried into acupuncture points to produce a long-time stimulation is a method which has been widely applied in the acupuncture and moxibustion therapies for diseases treating and they should...Thread-embedding materials buried into acupuncture points to produce a long-time stimulation is a method which has been widely applied in the acupuncture and moxibustion therapies for diseases treating and they should have excellent properties of good biocompatibility,biodegradability and moderate rigidity.Polyactic acid(PLA) as the thread-embedding material had some shortcomings such as poor hydrophilicity and slowly biodegradable speed.In this paper,PLA thread-embedding material was modified by chitosan coating which could improve rigidity,hydrophilicity and moisture absorption and thus produce better stimulation effect.The variation tendency of diameter,mass,hydrophilicity,and initial modulus of the sample under the change of chitosan coating concentration,coating time and coating times were studied respectively.The results showed that the hydrophilicity,mass,and initial modulus after coating rose in a certain range when the coating time,coating times and coating concentration increased,while the changing of coating had little impact on fiber diameter.展开更多
Two new compounds, namely 7α, 10α-dimethyl-3β-isopropene-1, 2-ene-octahydro- naphthalene (1) and ethyl 5Z,8Z,11Z,14Z-nonadecatetraenoate (2) were isolated from the soft coral Nephthea hainansis. Compound 1 was a ...Two new compounds, namely 7α, 10α-dimethyl-3β-isopropene-1, 2-ene-octahydro- naphthalene (1) and ethyl 5Z,8Z,11Z,14Z-nonadecatetraenoate (2) were isolated from the soft coral Nephthea hainansis. Compound 1 was a pseutosesquiterpene and 2 was a polyunsaturated fatty acid ethylate. Their structures were established on the basis of spectroscopic methods.展开更多
溢油污染的清除是全球性难题,为达到吸附降解分散油污的效果,以聚乳酸为载体,以正己烷为致孔剂,以甲基三氯硅烷(MTS)为硅烷基偶联剂,采用不良溶剂诱导相分离法制备甲基大孔聚乳酸(MPLA)微球。采用吸附性能、傅里叶红外光谱、静态接触角...溢油污染的清除是全球性难题,为达到吸附降解分散油污的效果,以聚乳酸为载体,以正己烷为致孔剂,以甲基三氯硅烷(MTS)为硅烷基偶联剂,采用不良溶剂诱导相分离法制备甲基大孔聚乳酸(MPLA)微球。采用吸附性能、傅里叶红外光谱、静态接触角等方法对MPLA表征测试,优化制备条件,详细研究温度对MPLA吸附性能的影响。结果表明:30 min MPLA对柴油可达到吸附平衡;准一级动力学和准二级动力学模型分析显示,内扩散作用并非MPLA吸附分散油污过程中唯一的速率控制步骤。由于分子耦合作用,MPLA微球表现出比聚乳酸更高的识别与选择结合油粒子的性能,且MPLA分子上亲油性脂肪族聚酯的存在增强了其亲油性,为固定化微生物追踪吸附分散的油污并进行生物降解开辟了新途径。展开更多
文摘Thread-embedding materials buried into acupuncture points to produce a long-time stimulation is a method which has been widely applied in the acupuncture and moxibustion therapies for diseases treating and they should have excellent properties of good biocompatibility,biodegradability and moderate rigidity.Polyactic acid(PLA) as the thread-embedding material had some shortcomings such as poor hydrophilicity and slowly biodegradable speed.In this paper,PLA thread-embedding material was modified by chitosan coating which could improve rigidity,hydrophilicity and moisture absorption and thus produce better stimulation effect.The variation tendency of diameter,mass,hydrophilicity,and initial modulus of the sample under the change of chitosan coating concentration,coating time and coating times were studied respectively.The results showed that the hydrophilicity,mass,and initial modulus after coating rose in a certain range when the coating time,coating times and coating concentration increased,while the changing of coating had little impact on fiber diameter.
基金supported by grants from National High Technology Development Project(863 project)(No.2001AA620403 and 2002AA217081)NNSFC(30171106,40176038)
文摘Two new compounds, namely 7α, 10α-dimethyl-3β-isopropene-1, 2-ene-octahydro- naphthalene (1) and ethyl 5Z,8Z,11Z,14Z-nonadecatetraenoate (2) were isolated from the soft coral Nephthea hainansis. Compound 1 was a pseutosesquiterpene and 2 was a polyunsaturated fatty acid ethylate. Their structures were established on the basis of spectroscopic methods.
文摘溢油污染的清除是全球性难题,为达到吸附降解分散油污的效果,以聚乳酸为载体,以正己烷为致孔剂,以甲基三氯硅烷(MTS)为硅烷基偶联剂,采用不良溶剂诱导相分离法制备甲基大孔聚乳酸(MPLA)微球。采用吸附性能、傅里叶红外光谱、静态接触角等方法对MPLA表征测试,优化制备条件,详细研究温度对MPLA吸附性能的影响。结果表明:30 min MPLA对柴油可达到吸附平衡;准一级动力学和准二级动力学模型分析显示,内扩散作用并非MPLA吸附分散油污过程中唯一的速率控制步骤。由于分子耦合作用,MPLA微球表现出比聚乳酸更高的识别与选择结合油粒子的性能,且MPLA分子上亲油性脂肪族聚酯的存在增强了其亲油性,为固定化微生物追踪吸附分散的油污并进行生物降解开辟了新途径。
