摘要
应用界面双层模型和界面固有化学势的概念 ,对菌紫质人工膜系统C(N)端界面受光激发所引起的界面自由能变化进行了初步的探讨 ,导出了bR相、C或N端界面能的一般表达式 ,及三类具体的菌紫质人工膜系统 (液 bR 液 ,固 bR 固 ,液 bR 固 )界面自由能的表达式 .可以看出 ,光照下的bR人工膜系统界面自由能的变化 ,不仅与物质组分相关 ,还与跨膜电势相联系 .据此 ,在一定范围内提高bR膜系统溶液的温度、pH值 ,以及降低跨膜电压 ,都将减少界面自由能 ,从而对系统的光驱质子泵过程产生影响 .本文研究仅局限于光照的影响 ,暂不涉及体系相结构变化的情形 .
The interfacial double lay model and the concept of the intrinsic chemical potential of interface were employed to study the interfacial free energy of the C-(N-) terminal in the system of bacteriorhodopsin (bR) artificial membrane (SBAM) during the illumination.The corresponding general equations of the interfacial energy of the bR phase,the C-(N-) terminal have been derived.Then,the theoretical expression of the interfacial free energy in the three specific SBAM's types:liquid/bR/liquid,solid/bR/solid,liquid/bR/solid were also given.The results show the interfacial free energy in the SBAM depend on the components of the system as well as the potential across the membrane.Hence,in the certain range the interfacial free energy can be diminished by increasing the pH value and the solution temperature of bR membrane system or by decreasing the potential across the membrane.So,the bR's proton pumping can be affected by these factors.In a word,the discussion in this paper limited to the effect of ilumination and the effect of the change of the phase structure were not involved.
出处
《首都师范大学学报（自然科学版）》
2002年第1期28-32,共5页
Journal of Capital Normal University：Natural Science Edition
