【摘 要】
：
The Changjiang River Estuary (CRE) in the East China Sea suffers from seasonal hypoxia in summer. The vertical distributions and seasonal changes of microbial c
【机 构】
：
Marine Microorganism Ecological&Application Laboratory
【基金项目】
：
The National Key R&D Program of China under contract No.2019YFD0901305,the Science and Technology Program of Zhoushan under contract No.2019C21011,the National Natural Science Foundation of China unde
论文部分内容阅读
The Changjiang River Estuary (CRE) in the East China Sea suffers from seasonal hypoxia in summer. The vertical distributions and seasonal changes of microbial communities in the CRE were well documented. However, little is known about the diurnal changes of bacterial communities in the hypoxic zone of the CRE. Here, 16S rRNA gene analysis was used to explore the changes of bacterial communities in the oxic surface and hypoxic middle seawater layers during 24 h in the CRE. Significant differences between the hypoxic and oxic layers were observed: the phyla Cyanobacteria, Bacteroidetes and Acidimicrobiia were enriched in the oxic layer, whereas the phylum SAR406 and the class Deltaproteobacteria were more abundant in the hypoxic layer. In addition, some subtle diurnal variations of the bacterial relative abundance were found in both two layers. The relative abundance of Synechococcus increased at night, and this change was more obvious in the hypoxic layer. The similar trend was also found in some phototrophic and several heterotrophic bacteria, such as Rhodobacteraceae, OM60 and Flavobacteriaceae. Their relative abundances peaked at 16:00 in the oxic layer, while the relative abundances peaked at around 7:00 and decreased until 13:00 in the hypoxic layer. Together, the results of the present study suggest that some photosynthetic bacteria and several heterotrophic bacteria have similar diurnal variations implying the light and physicochemical heterogeneity in the course of a day are important for bacterial diurnal changes in the CRE.
其他文献
6月9日,全国数字生态创新大赛总决赛暨全国数字生态创新发展峰会在遂昌举办.丽水市委书记胡海峰,省科技厅党组副书记、副厅长孙旭东参加活动.rn来自全国各地450余位专家学者
从激光增材制造材料、工艺、装备、应用等方面分析了激光增材制造技术当前的研究热点以及相关的研究进展,梳理了未来主要发展方向.材料和成型工艺方面的相关研究主要集中于轻
为了研究激光工艺参量对碳钢表面锈蚀污染层清洗质量的影响规律,采用Nd∶YAG准连续激光器对Q235钢板试样进行了激光除锈清洗试验,并观测了试样表面清洗质量。分析了激光清洗污染物烧蚀的工作机理,并试验研究了激光能量密度、扫描速率、扫描宽度、离焦量和重复频率等工艺参量对清洗质量的影响,在此基础上进行了正交试验;通过对激光清洗前后试件进行表面粗糙度、形貌和能谱分析,获得了Q235钢最佳激光工艺参量分别为扫描速率900mm/min、离焦量1mm、能量密度7.6J/cm2、扫描宽度30mm。结
6月15日,浙江省科学技术奖励大会首度对获得“科技创新鼎”和2020年度市县党政领导科技进步目标责任制考核优秀单位现场授鼎、授牌.杭州市等3个市、杭州市滨江区等6个县(市、
古气候学是研究地球的过往气候的一门学科,可以预测未来气候变化,解决有关环境、资源等问题。基于激光诱导击穿光谱的元素成像技术可以快速、准确、原位分析复杂多样的大面积古气候样本,获得能够与气候建立联系的元素信息,在气候变化研究中展现出很好的应用前景。首先介绍了基于激光诱导击穿光谱的元素成像技术的基本原理,其次回顾了目前常用的成像系统的仪器配置,包括激光光源、聚焦系统和光谱探测系统等,最后介绍了国内外基于激光诱导击穿光谱元素成像技术分析古气候代理物的典型案例。该研究对基于激光诱导击穿光谱的元素成像技术在古气候研
The optimum multiparameter (OMP) method was often used to determine the percentages of water masses based on temperature, salinity and other parameters, like nu
为了探究部分相干Airy涡旋光束在非Kolmogorov谱中模态强度的演化规律,基于广义的Huygens-Fresnel原理和Rytov近似理论,推导了部分相干Airy涡旋光束的轨道角动量模态概率的解析式。结合MATLAB的数值模拟,研究了部分相干Airy涡旋光束在非Kolmogorov谱湍流大气中传输时湍流参量和波束参量与涡旋模态强度的关系,对部分相干Airy涡旋光束的相干宽度在传输过程中对模态强度的影响进行了理论分析。结果表明,选取拓扑荷数较小、主亮环半径较大、波长较长的部分相干Airy涡旋光束能有效
近期,浙江省科技厅厅机关党支部和厅属单位基层党组织创新党史学习教育新模式,通过开展组织建设、党员互动、活动互联、资源共享的党组织“联学+联建”党建新模式,推动党史学
5月29日至30日,为期两天的全国计算机技术与软件专业技术资格(水平)考试顺利举行。全省共有14个专业资格开考,19635名考生参加考试,报考人数再创新高。省人力社保厅专技处、省科技厅人事处负责人到场指导。浙江“全国软考”工作由浙江省人力社保厅和浙江省科技厅主管,浙江省科技宣传教育中心(浙江省软件考试实施中心)负责具体组织实施,考试每年举行两次。此次“全国软考”浙江考区报考人数与往年最高单次报考人数相比增长56.2%,其中在职人员报考比例、高级资格报考人数较往年都有较大幅度增长.
6月15日下午,浙江省科学技术奖励大会在省人民大会堂举行.省委书记、省人大常委会主任袁家军,省委副书记、省长郑栅洁出席大会.rn在热烈的掌声中,袁家军向2020年度浙江科技大