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In circadian rhythm generation,intercellular signaling factors are shown to play a crucial role in both sustaining intrinsic cellular rhythmicity and acquiring collective behaviours across a population of circadian neurons.However,the physical mechanism behind their role remains to be fully understood.In this paper,we propose an indirectly coupled multicellular model for the synchronization of Drosophila circadian oscillators combining both intracellular and intercellular dynamics.By simulating different experimental conditions,we find that such an indirect coupling way can synchronize both heterogeneous self-sustained circadian neurons and heterogeneous mutational damped circadian neurons.Moreover,they can also be entrained to ambient light-dark(LD) cycles depending on intercellular signaling. 相似文献
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室温下硒(Ⅳ)与邻苯二胺配位生成黄色配合物,用环己烷萃取后,在最大吸收波长330nm处测定其吸光度。实验结果表明,硒含量在4~20μg/mL时线性关系良好,线性方程A=0.1999c-0.0011(R=0.9995)。最优化条件下测定硒盐中硒的含量取得满意结果。方法操作简单,设备和药品价格低廉,准确度高,稳定性好,适宜于基层实验室对食品中微量元素硒的检验。 相似文献
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室温下,硒(IV)与邻苯二胺配位生成黄色配合物,用环己烷萃取后,在最大吸收波长330nm处测定其吸光度。实验结果表明:硒含量在4~20 μg/mL内线性关系良好,线性方程Y=0.1999C-0.0011(R=0.9995)。最优化条件下测定硒盐中硒的含量取得满意结果。该法操作简单,设备和药品价格低廉,准确度高,稳定性好,适宜于基层实验室对食品中微量元素硒的检验。 相似文献
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We demonstrate that the projective synchronization can be observed in coupled fractional-order chaotic systems. A new systematic and powerful coupling scheme is developed to investigate the projective synchronization via the open-plus-closed-loop control, which allows us to arbitrarily manipulate the scaling factor of projective synchronization. The proposed scheme is proved analytically on the basis of the stability theorem of the fractional differential equations. Numerical simulations on the fraction-order chaotic Chen system are presented to justify the theoretical analysis. 相似文献
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