移动社会网络(Mobile Social Network,MSN)具有社会网络特征,移动智能终端设备由于自身资源限制,往往表现出节点自私性。现有研究主要集中于解决节点个体自私性,而忽视了对节点社会自私性的甄别与利用。因此,文中提出了一种基于亲缘关...移动社会网络(Mobile Social Network,MSN)具有社会网络特征,移动智能终端设备由于自身资源限制,往往表现出节点自私性。现有研究主要集中于解决节点个体自私性,而忽视了对节点社会自私性的甄别与利用。因此,文中提出了一种基于亲缘关系的分族分层路由算法。首先,在依据亲缘关系指数分族分层的社区和集群中,自荐的节点通过比较综合举荐值产生族节点和中继节点。然后,以亲缘关系预测的转移概率为转发依据,借助族节点和中继节点优化盲目转发,在有效地控制副本数的同时预测关联可靠路径链路,实现基于节点亲缘关系的相遇投递策略。仿真实验结果表明,该算法可以在保护与利用社会自私性的基础上,有效地提高消息投递率,降低网络时延,提高网络的通信流量等。展开更多
As a major component of lignin and abundantly existing in softwood and hardwood, ferulic acid has been used as a lignin-related compound for lignin biodegradation study. Biodegradation of ferulic acid by Cupriavidus s...As a major component of lignin and abundantly existing in softwood and hardwood, ferulic acid has been used as a lignin-related compound for lignin biodegradation study. Biodegradation of ferulic acid by Cupriavidus sp. B-8, a newly isolated strain, was studied. This strain is able to utilize a wide range of lignin-related aromatic compounds as the sole carbon and energy source, including guaiacol, veratric acid, vanillic acid, cinnamic acid, p-coumaric acid, ferulic acid, and sinapic acid. In addition, the effects of different concentrations of ferulic acid on growth of Cupriavidus sp. B-8 were studied. The growth of Cupriavidus sp. B-8 is better under the condition of lower concentration. High-performance liquid chromatography （HPLC） analysis reveals that above 95% of ferulic acid is degraded within 12 h by Cupriavidus sp. B-8. Based on identification of biodegradation intermediates and further metabolites, the biodegradation pathway of ferulic acid by Cupriavidus sp. B-8 was proposed. Ferulic acid is initially converted to 4-vinylguaiacol, and further oxidized to vanillic acid and protocatechuic acid.展开更多
A newly isolated bacterium was screened out for its survival on medium with 6 000 mg/L kraft lignin as the sole carbon source and energy, and identified as Pandoraea sp. by 16S rRNA gene sequence analysis. The biodegr...A newly isolated bacterium was screened out for its survival on medium with 6 000 mg/L kraft lignin as the sole carbon source and energy, and identified as Pandoraea sp. by 16S rRNA gene sequence analysis. The biodegradation experiment was carried out in mineral salt medium, containing 5 000 mg/L kraft lignin as only carbon and energy at pH 8.0 and 30℃. Under these conditions, significant reduction in color and lignin content by the strain was observed after incubation for 5 d. The strain attains maximum reduction capability in color （44.6%） and lignin content （39.9%） within 5 d of incubation, and reduced chemical oxygen demand（COD） from initial concentration 7 399 to 3 980 mg/L at maximum reduction level of 46.2% on the 4th day. The total ion chromatograph （TIC） of compounds presented in the chloroform extract of control and bacterial treated samples shows the formation of several lignin-related aromatic compounds including some small molecular lignin fragments, indicating a strong destruction in the lignin structure.展开更多
文摘移动社会网络(Mobile Social Network,MSN)具有社会网络特征,移动智能终端设备由于自身资源限制,往往表现出节点自私性。现有研究主要集中于解决节点个体自私性,而忽视了对节点社会自私性的甄别与利用。因此,文中提出了一种基于亲缘关系的分族分层路由算法。首先,在依据亲缘关系指数分族分层的社区和集群中,自荐的节点通过比较综合举荐值产生族节点和中继节点。然后,以亲缘关系预测的转移概率为转发依据,借助族节点和中继节点优化盲目转发,在有效地控制副本数的同时预测关联可靠路径链路,实现基于节点亲缘关系的相遇投递策略。仿真实验结果表明,该算法可以在保护与利用社会自私性的基础上,有效地提高消息投递率,降低网络时延,提高网络的通信流量等。
基金Foundation item： Project（50925417） supported by the National Science Fund for Distinguished Young Scholars of China Project（50830301） supported by the National Natural Science Foundation of China Project（2011467062） supported by National Research Fund for Public Benefit （Environmental Protection） Industries, China
文摘As a major component of lignin and abundantly existing in softwood and hardwood, ferulic acid has been used as a lignin-related compound for lignin biodegradation study. Biodegradation of ferulic acid by Cupriavidus sp. B-8, a newly isolated strain, was studied. This strain is able to utilize a wide range of lignin-related aromatic compounds as the sole carbon and energy source, including guaiacol, veratric acid, vanillic acid, cinnamic acid, p-coumaric acid, ferulic acid, and sinapic acid. In addition, the effects of different concentrations of ferulic acid on growth of Cupriavidus sp. B-8 were studied. The growth of Cupriavidus sp. B-8 is better under the condition of lower concentration. High-performance liquid chromatography （HPLC） analysis reveals that above 95% of ferulic acid is degraded within 12 h by Cupriavidus sp. B-8. Based on identification of biodegradation intermediates and further metabolites, the biodegradation pathway of ferulic acid by Cupriavidus sp. B-8 was proposed. Ferulic acid is initially converted to 4-vinylguaiacol, and further oxidized to vanillic acid and protocatechuic acid.
基金Project(50925417) supported by the National Funds for Distinguished Young Scientists,ChinaProject(50830301) supported by the Key program of the National Natural Science Foundation of ChinaProject(2012BAC12B03) supported by the National 12th Five-year Plan for Science and Technology Support,China
文摘A newly isolated bacterium was screened out for its survival on medium with 6 000 mg/L kraft lignin as the sole carbon source and energy, and identified as Pandoraea sp. by 16S rRNA gene sequence analysis. The biodegradation experiment was carried out in mineral salt medium, containing 5 000 mg/L kraft lignin as only carbon and energy at pH 8.0 and 30℃. Under these conditions, significant reduction in color and lignin content by the strain was observed after incubation for 5 d. The strain attains maximum reduction capability in color （44.6%） and lignin content （39.9%） within 5 d of incubation, and reduced chemical oxygen demand（COD） from initial concentration 7 399 to 3 980 mg/L at maximum reduction level of 46.2% on the 4th day. The total ion chromatograph （TIC） of compounds presented in the chloroform extract of control and bacterial treated samples shows the formation of several lignin-related aromatic compounds including some small molecular lignin fragments, indicating a strong destruction in the lignin structure.
