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Storage and Subsequent Reactivation of Phosphate-Accumulating Aerobic Granules
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作者 黄宇 赵林 +2 位作者 谭欣 董涛 李金娟 《Transactions of Tianjin University》 EI CAS 2011年第3期187-193,共7页
Phosphate-accumulating aerobic granules cultivated in a sequencing batch reactor were composed of inner rod-shaped bacteria aggregates and outer twining filamentous bacteria. The influence of two-month storage under d... Phosphate-accumulating aerobic granules cultivated in a sequencing batch reactor were composed of inner rod-shaped bacteria aggregates and outer twining filamentous bacteria. The influence of two-month storage under dif- ferent conditions on the storage and subsequent reactivation performance of aerobic granules was investigated. After two-month storage the granules sealed at 4 ~C in distilled water or normal saline (named granules A and granules B, respectively) could maintain their characteristics as before, while the granules idled in the reactor at room temperature (named granules C) exhibited decreased properties. During reactivation, granules A and granules B presented almost identical recovery performance, faster than granules C, in terms of phosphorus removal efficiency, mixed liquor sus- pended solids (MLSS), phosphate release and accumulating ability. The results suggest that hermetical storage at low temperature promoted the maintenance of the granular properties and the reviving behaviors of phosphateaccumulating aerobic granules, and storage medium had little influence on the storage and recovery perfomlance. 展开更多
关键词 phosphate-accumulating aerobic granules STORAGE REACTIVATION granular structure
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厌氧氨氧化菌细胞的超微结构及功能 被引量:16
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作者 贾方旭 彭永臻 +2 位作者 王衫允 王淑莹 杨庆 《应用与环境生物学报》 CAS CSCD 北大核心 2014年第5期944-954,共11页
厌氧氨氧化菌是浮霉状菌属(Planctomyces)的化能自养型细菌,其在缺氧条件下以亚硝酸盐(NO2-)作为电子受体将氨(NH4+)转化为氮气(N2).该过程具有高效低耗的优点,因而厌氧氨氧化工艺成为目前最具应用前景的污水脱氮工艺,为了更好地将厌氧... 厌氧氨氧化菌是浮霉状菌属(Planctomyces)的化能自养型细菌,其在缺氧条件下以亚硝酸盐(NO2-)作为电子受体将氨(NH4+)转化为氮气(N2).该过程具有高效低耗的优点,因而厌氧氨氧化工艺成为目前最具应用前景的污水脱氮工艺,为了更好地将厌氧氨氧化工艺应用到实际规模中,对厌氧氨氧化菌的生物学研究非常必要.近年来,电镜技术的快速发展使得厌氧氨氧化菌超微结构的研究成为可能.厌氧氨氧化菌结构独特,被厌氧氨氧化体膜、胞浆内膜、细胞质膜分隔成厌氧氨氧化体、核糖细胞质及外室细胞质3个部分.本文由内至外地总结和描述了厌氧氨氧化菌的细胞器、膜结构、储存颗粒以及细胞附属物的形态特征,并对他们的功能进行了合理的解释和推测,得出以下结论:1)厌氧氨氧化体占据细胞体积的50%左右,是厌氧氨氧化菌最重要的细胞器,为厌氧氨氧化菌的代谢提供了场所;2)厌氧氨氧化体膜具有致密的阶梯烷膜脂结构,可抵抗有毒中间产物扩散从而保护细胞;3)厌氧氨氧化体内的铁储存颗粒可为血红素提供铁元素从而加快细胞的新陈代谢,而核糖细胞质中的糖原物质与储存颗粒可能分别与生物膜的形成及能量储存有关;4)厌氧氨氧化菌的菌毛可能与细胞黏着或胞间通讯相关,而S-layer对细胞的完整性及细胞形状的维持起着至关重要的作用.目前对厌氧氨氧化菌超微结构的研究还仅局限于生物学方面,建议今后以不同水质及操作条件下厌氧氨氧化细胞超微结构的改变为研究重点. 展开更多
关键词 厌氧氨氧化 超微结构 厌氧氨氧化体 阶梯烷膜脂 储存颗粒 细胞分裂环 S-LAYER
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Segmented cylindrical vector beams for massively-encoded optical data storage 被引量:10
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作者 Mingcong Xian Yi Xu +3 位作者 Xu Ouyang Yaoyu Cao Sheng Lan Xiangping Li 《Science Bulletin》 SCIE EI CSCD 2020年第24期2072-2079,M0005,共9页
The possibility to achieve unprecedented multiplexing of light-matter interaction in nanoscale is of virtue importance from both fundamental science and practical application points of view. Cylindrical vector beams(C... The possibility to achieve unprecedented multiplexing of light-matter interaction in nanoscale is of virtue importance from both fundamental science and practical application points of view. Cylindrical vector beams(CVBs) manifested as polarization vortices represent a robust and emerging degree of freedom for information multiplexing with increased capacities. Here, we propose and demonstrate massivelyencoded optical data storage(ODS) by harnessing spatially variant electric fields mediated by segmented CVBs. By tight focusing polychromatic segmented CVBs to plasmonic nanoparticle aggregates, recordhigh multiplexing channels of ODS through different combinations of polarization states and wavelengths have been experimentally demonstrated with a low error rate. Our result not only casts new perceptions for tailoring light-matter interactions utilizing structured light but also enables a new prospective for ultra-high capacity optical memory with minimalist system complexity by combining CVB’s compatibility with fiber optics. 展开更多
关键词 Cylindrical vector beams Light-matter interaction Plasmonic nanostructures Optical multiplexing Data storage
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