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1 INTRODUCTION Magnetotactic bacteria are able to respond and orient along the direction of terrestrial or artificial magnetic field, a behavior referred to as magneto- taxis. In the majority of magnetotactic bacteria, the magnetosomes are 25–120 nm in d… 相似文献
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该文给出了利用极轨气象卫星AVHRR多个红外通道资料在不同火点强度条件下估算亚像元火点面积和温度的方法，包括利用牛顿迭代法求解不同红外波段（如:中红外3.7 μm通道和热红外11 μm通道，或短波红外1.6 μm通道和热红外11 μm通道）混合像元表达式建立的二元非线性方程组, 得到亚像元火点面积和温度；通过建立亚像元火点面积和温度与11 μm混合像元亮温增量和11 μm与12 μm混合像元亮温增量差异的关系，以查表方式获得对于相同红外波段不同通道（如11 μm和12 μm通道）亚像元火点面积和温度估算值。 相似文献
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Journal of Oceanology and Limnology - Magnetotactic bacteria(MTB) display magnetotaxis ability because of biomineralization of intracellular nanometer-sized, membrane-bound organelles termed... 相似文献
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Qian Xinxin Zhao Yicong Santini Claire-Lise Pan Hongmiao Xiao Tian Chen Haitao Song Tao Li Jinhua Alberto Francois Brustlein Sophie Wu Long-Fei 《中国海洋湖沼学报》2021,39(6):2005-2014
Journal of Oceanology and Limnology - Magnetotactic bacteria (MTB) synthesize intracellular magnetic organelles, magnetosomes, which consist of magnetic crystals that are enveloped in a membrane.... 相似文献
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Chen Si Cui Kaixuan Zhang Wenyan Zhao Yicong Xiao Tian Pan Hongmiao Zhang Wuchang Wu Long-Fei 《中国海洋湖沼学报》2021,39(6):2053-2062
Journal of Oceanology and Limnology - Magnetotactic bacteria(MTB) are a group of prokaryotes having the ability to orient and swim along geomagnetic fi eld lines because they contain intracellular... 相似文献
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Occurrence and microscopic analyses of multicellular magnetotactic prokaryotes from coastal sediments in the Yellow Sea 总被引：1，自引：0，他引：1
Multicellular magnetotactic prokaryotes(MMPs) are a group of aggregates composed of 7-45 gram-negative cells synthesizing intracellular magnetic crystals.Although they are thought to be globally distributed,MMPs have been observed only in marine environments in America and Europe.Most MMPs share a rosette-like morphology and biomineralize iron sulfide crystals.In the present study,abundant MMPs were observed,with a density of 26 ind./cm3,in the sediments of a coastal lagoon,Lake Yuehu,in the Yellow Sea.Optical microscopy showed that all of them were rosette shaped with a diameter of 5.5±0.8 mm.Transmission electron microscopy revealed that these MMPs were composed of 10-16 ovoid cells and flagellated peritrichously.High-resolution transmission electron microscopy and energy dispersive X-ray analysis indicated that they biomineralized bullet-shaped magnetite crystals in highly organized parallel chains within which the magnetosomes were oriented in the same direction.This is the first report of MMPs from Asia and demonstrates the ubiquitous distribution of MMPs. 相似文献
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荣成月湖潮间带单细胞趋磁细菌的多样性研究 总被引：1，自引：0，他引：1
Marine magnetotactic bacteria were collected from the intertidal sediments of Yuehu Lake(China), where their abundance reached 103–104 ind./cm3. Diverse morphotypes of magnetotactic bacteria were observed, including cocci and oval, vibrio-, spirillum-, rod-, elliptical-, handle- and bar-shaped forms. The magnetococci were the most abundant, and had flagella arranged in parallel within a bundle. The majority of magnetosomes were arranged in one, two or multiple chains, although irregular arrangements were also evident. All the results of high-resolution transmission electron microscopy(HRTEM) analysis show that magnetosome crystals were composed of Fe3O4, and their morphology was specific to particular cell morphotypes. By the 16 S r RNA gene sequence analysis, we found fourteen operational taxonomic units(OTUs) which were related to magnetotactic bacteria. Among these, thirteen belonged to the Alphaproteobacteria and one to the Gammaproteobacteria.Compared with known axenic and uncultured marine magnetotactic bacteria, the 16 S r RNA gene sequences of most magnetotactic bacteria collected from the Yuehu Lake exhibited sequence identities ranging from 90.1% to96.2%(97%). The results indicate that microbial communities containing previously unidentified magnetotactic bacteria occur in the Yuehu Lake. 相似文献
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本文介绍了利用遥感技术对宝天铁路滑坡和崩塌灾害的调查与动态分析。通过对5个时相不同比例尺的航空像片的分析判读,在宝天段线路两侧各1公里的地带内共发现滑坡398处、崩塌206处,其中涉及线路的滑坡61处、崩塌94处。其次,在综合分析地形、地质、水文和人文等病害因素的基础上,探讨了该区域工程病害的发生规律。分析结果表明,滑坡以发生在黄土者最多,其次为破碎的变质岩和风化的花岗岩,而砂砾岩中最少;崩塌以发生在花岗岩者居多,其次是变质岩系,再次为黄土,砂砾岩中最少。该成果不仅发现了比既有资料多得多的滑坡数量,而且初步摸到了滑坡的发生规律,从而为该段线路病害的防治提供了可靠的依据。 相似文献