摘要:
Hyperbranched organometallic polymers, including poly [1,1′-ferrocenylenesilynes], poly [1,1′-ferrocenylene-(alkyl)silynes], poly [1,1′-ferrocenylene(alkenyl)silynes] and poly [1,1′-ferrocenylene(aromatic)silynes], are useful as precursors to certain ceramic materials. Processes for the preparation of such polymers and the preparation of ceramic materials from such polymers are described, as are the resulting ceramic materials and their use as ferromagnetic materials and electrically conductive materials.
摘要:
A method for limiting the transmission of light through a material is disclosed. In the method, a layer composed of a hyperbranched polymer formed via a copolycyclotrimerization reaction is interposed between a light source and the material. Also provided is a method for emitting light comprising exciting the hyperbranched polymer. In addition, methods for limiting the transmission of light and for emitting light using hyperbranched polymers formed by homopolycyclotrimerization reactions are disclosed. A new class of hyperbranched polymers produced by copolycyclotrimerization is also disclosed.
摘要:
A method for limiting the transmission of light through a material is disclosed. In the method, a layer composed of a hyperbranched polymer formed via a copolycyclotrimerization reaction is interposed between a light source and the material. Also provided is a method for emitting light comprising exciting the hyperbranched polymer. In addition, methods for limiting the transmission of light and for emitting light using hyperbranched polymers formed by homopolycyclotrimerization reactions are disclosed. A new class of hyperbranched polymers produced by copolycyclotrimerization is also disclosed.
摘要:
Optical glasses and polymers are described that incorporate homogeneously dispersed fullerene molecules. The resultant materials may be used as optical filters, the cut-off frequency being easily adjustable by changing the fullerene content. To prepare glasses fullerene molecules are firstly functionalized by amination prior to being incorporated into a sol-gel process to prepare the glass. To prepare polymers a pre-existing polymer may be subject to fullerenation, or fullerene may be copolymerized with a selected monomer.
摘要:
Method and compositions for reducing the inflammation after cytokine exposure of an islet cell transplant without affecting the viability and potency are disclosed herein. The present invention describes a composition comprising Withaferin A (WA), a steroidal lactone derived from Withania somnifera to effectively block NF-kB activation in beta cells, minimize cytokine-induced cell death and improve survival of transplanted islets. The method of the present invention involves identifying a subject having islet cells in need of treatment; and providing a effective amount of a Withaferin A composition disposed in a pharmaceutically acceptable carrier in an amount sufficient to reduce the inflammation after cytokine exposure without affecting the viability and potency of the islet cell population.
摘要:
Method and compositions for reducing the inflammation after cytokine exposure of an islet cell transplant without affecting the viability and potency are disclosed herein. The present invention describes a composition comprising Withaferin A (WA), a steroidal lactone derived from Withania somnifera to effectively block NF-kB activation in beta cells, minimize cytokine-induced cell death and improve survival of transplanted islets. The method of the present invention involves identifying a subject having islet cells in need of treatment; and providing a effective amount of a Withaferin A composition disposed in a pharmaceutically acceptable carrier in an amount sufficient to reduce the inflammation after cytokine exposure without affecting the viability and potency of the islet cell population.
摘要:
A method and system for assessing keyword usage based on frequency of usage of the keywords during various periods is provided. A keyword usage measurement system is provided with the frequency of keywords during various periods. The measurement system then calculates a recent usage score for a keyword by combining a frequency impulse score for the keyword with a frequency weight for the keyword. The frequency impulse score for a keyword indicates whether a recent change in the frequency of the keyword has occurred. The frequency weight for a keyword indicates a recent measure of the frequency of the keyword.
摘要:
A method and system for assessing keyword usage based on frequency of usage of the keywords during various periods is provided. A keyword usage measurement system is provided with the frequency of keywords during various periods. The measurement system then calculates a recent usage score for a keyword by combining a frequency impulse score for the keyword with a frequency weight for the keyword. The frequency impulse score for a keyword indicates whether a recent change in the frequency of the keyword has occurred. The frequency weight for a keyword indicates a recent measure of the frequency of the keyword.