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庆祝中国藻类学会成立30周年暨第十五次学术讨论会

作者： Fang Lü~(1 3 5) Wei Xü~(2 3 5) Chao Tian~(1 5) Guangce Wang~(1 *) Jiangfeng Niu~1 Guanghua Pan~4 songnian hu~3 1.institute of oceanology the Chinese Academy of Sciences(IOCAS) Qingdao 266071 China 2.Beijing Genomics institute Chinese Academy of Sciences(BGICAS) Beijing 101300 China 3.Graduate University of the Chinese Academy of Sciences Beijing 100039 China 4.College of Marine Science and Engineering Tianjin University of Science and Technology Tianjin 300457 China

＜正＞Bryopsis hypnoides Lamouroux is a siphonous green alga,and its extruded protoplasm can aggregate spontaneously in seawater and develop into mature *** chloroplast of *** is the biggest organelle in the cell and shows strong *** better understand this organelle,we sequenced and analyzed the chloroplast genome of this green alga.A total of 111 functional genes, including 69 potential protein-coding genes,5 ribosomal RNA genes,and 37 tRNA genes were *** genome size（153,429 bp）,arrangement,and inverted-repeat（IR）-lacking structure of the *** chloroplast DNA（cpDNA） closely resembles that of Chlorella ***,our cytogenomic investigations using pulsed-field gel electrophoresis（PFGE） and southern blotting methods showed that the *** cpDNA had multimeric forms,including monomer,dimer,trimer,tetramer,and even higher multimers,which is similar to the higher order organization observed previously for higher plant *** relative amounts of the four multimeric cpDNA forms were estimated to be about 1,1/2,1/4, and 1/8 based on molecular hybridization *** analyses based on a concatenated alignment of chloroplast protein sequences suggested that *** is located in a lineage with Oltmannsiellopsis viridis and Pseudendoclonium akinetum within the *** of the results suggest that the autonomy of the chloroplasts of *** has little to do with the size and gene content of the cpDNA,and the IR-lacking structure of the chloroplasts indirectly demonstrated that the multimeric molecules might result from the random cleavage and fusion of replication intermediates instead of recombinational events.

关键词： Bryopsis hypnoides plastid genome phylogenetic analyses pulsed-field gel electrophoresis(PFGE) multimeric forms

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Global Marine Cold Seep Metagenomes Reveal Diversity of Taxonomy,Metabolic Function,and Natural Products

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Genomics, Proteomics & Bioinformatics 2024年第2期22卷 121-134页

作者： Tao Yu Yingfeng Luo Xinyu Tan Dahe Zhao Xiaochun Bi Chenji Li Yanning Zheng hua Xiang songnian hu State Key Laboratory of Microbial Resources Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Cold seeps in the deep sea are closely linked to energy exploration as well as global climate *** alkane-dominated chemical energy-driven model makes cold seeps an oasis of deep-sea life,showcasing an unparalleled reservoir of microbial genetic ***,by analyzing 113 metagenomes collected from 14 global sites across 5 cold seep types,we present a comprehensive Cold Seep Microbiomic Database(CSMD)to archive the genomic and functional diversity of cold seep *** CSMD includes over 49 million non-redundant genes and 3175 metagenome-assembled genomes,which represent 1895 species spanning 105 *** addition,beta diversity analysis indicates that both the sampling site and cold seep type have a substantial impact on the prokaryotic microbiome community *** and anaerobic metabolisms are prevalent in microbial communities,accompanied by considerable mixotrophs and facultative anaerobes,highlighting the versatile metabolic potential in cold ***,secondary metabolic gene cluster analysis indicates that at least 98.81%of the sequences potentially encode novel natural products,with ribosomally synthesized and post-translationally modified peptides being the predominant type widely distributed in archaea and ***,the CSMD represents a valuable resource that would enhance the understanding and utilization of global cold seep microbiomes.

关键词： Global marine cold seep Metagenome Prokaryotic microbiome Metabolic function Natural product

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Linear shallow neural network to accelerate transmitter dispersion eye closure quaternary(TDECQ) assessment

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Science China(Information Sciences) 2024年第4期67卷 337-338页

作者： Junjiang XIANG Zejun CHEN Yijun CHENG Hailin YANG Xuancheng huO Meng XIANG Gai ZHOU Yuwen QIN songnian FU institute of Advanced Photonics Technology School of Information EngineeringGuangdong University of Technology School of Optical and Electronic Information Huazhong University of Science and Technology Key Laboratory of Photonic Technology for Integrated Sensing and Communication Ministry of Education of ChinaGuangdong University of Technology Guangdong Provincial Key Laboratory of Information Photonics Technology Guangdong University of Technology

To support the ever-emerging capacity requirement of datacenter interconnection(DCI) applications, transmitter dispersion eye closure quaternary(TDECQ) has been proposed by IEEE802.3 standard [1], which is specifically employed for the four-level pulse amplitude modulation(PAM-4) signals. However, the traditional scheme of TDECQ assessment needs several iterative operations,

关键词： IEEE Standards

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Differential mode-gain equalization via femtosecond laser micromachining-induced refractive index tailoring

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Light(Advanced Manufacturing) 2024年第2期5卷 24-32页

作者： Cong Zhang Senyu Zhang Yan Zeng Yue Wang Meng Xiang Di Lin songnian Fu Yuwen Qin institute of Advanced Photonics Technology School of Information EngineeringGuangdong University of TechnologyGuangzhou510006China Key Laboratory of Photonic Technology for Integrated Sensing and Communication Ministry of Education of ChinaGuangdong University of TechnologyGuangzhou510006China Guangdong Provincial Key Laboratory of Information Photonic Technology Guangdong University of TechnologyGuangzhou 510006China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan430074China

The mode-division multiplexing technique combined with a few-mode erbium-doped fiber amplifier(FM-EDFA)demonstrates significant potential for solving the capacity limitation of standard single-mode fiber(SSMF)transmission ***,the differential mode gain(DMG)arising in the FM-EDFA fundamentally limits its transmission capacity and ***,an innovative DMG equalization strategy using femtosecond laser micromachining to adjust the refractive index(RI)is *** mode-dependent attenuations can be achieved according to the DMG profile of the FM-EDFA,enabling DMG *** validate the proposed strategy,DMG equalization of the commonly used FM-EDFA configuration was *** results revealed that by optimizing both the length and RI modulation depth of the femtosecond laser-tailoring area,the maximum DMG(DMGmax)among the 3 linear-polarized(LP)mode-group was mitigated from 10 dB to 1.52 dB,whereas the average DMG(DMGave)over the C-band was reduced from 8.95 dB to 0.78 ***,a 2-LP mode-group DMG equalizer was experimentally demonstrated,resulting in a reduction of the DMGmax from 2.09 dB to 0.46 dB,and a reduction of DMGave over the C band from 1.64 dB to 0.26 dB,with only a 1.8 dB insertion ***,a maximum range of variable DMG equalization was achieved with 5.4 dB,satisfying the requirements of the most commonly used 2-LP mode-group amplification scenarios.

关键词： Mode-division multiplexing Few-mode Erbium-doped fiber amplifier Differential mode gain Femtosecond laser micromachining

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BloomDT-An improved privacy-preserving decision tree inference scheme

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Journal of Information and Intelligence 2024年第2期2卷 130-147页

作者： Sean Lalla Rongxing Lu Yunguo Guan songnian Zhang Canadian institute for Cybersecurity(CIC) Faculty of Computer ScienceUniversity of New Brunswick(UNB)Fredericton E3B 5A3Canada

Outsourcing decision tree models to cloud servers can allow model providers to distribute their models at scale without purchasing dedicated hardware for model ***,model providers may be forced to disclose private model details when hosting their models in the *** to the time and monetary investments associated with model training,model providers may be reluctant to host their models in the cloud due to these privacy ***,clients may be reluctant to use these outsourced models because their private queries or their results may be disclosed to the cloud *** this paper,we propose BloomDT,a privacy-preserving scheme for decision tree inference,which uses Bloom filters to hide the original decision tree's structure,the threshold values of each node,and the order in which features are tested while maintaining reliable classification results that are secure even if the cloud servers *** scheme's security and performance are verified through rigorous testing and analysis.

关键词： Decision tree Privacy-preserving machine learning Bloom filter Model outsourcing

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Intraseasonal variability of the Kuroshio observed via mooring at 18°N

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Journal of oceanology and Limnology 2024年第2期42卷 468-483页

作者： Xin YUAN Qingye WANG Jie MA Shijian hu Dunxin hu Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Laoshan Laboratory Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Insufficient observations near the origin of the Kuroshio have led to incomplete understanding of the intraseasonal variability(ISV)of the *** measurements of the Kuroshio velocity were performed with an array of three profiler moorings(122.7°E,123°E,and 123.3°E)along 18°N from January 2018 to February *** ISV of the Kuroshio at 18°N was investigated based on a combination of mooring observations and global high-resolution HYbrid Coordinate Ocean Model reanalysis *** estimated time-averaged transport in the upper 350 m across the observation transect was 6.5±2.6 Sv(1.0 Sv=10^(6)m^(3)/s).Two significant ISV peaks at 50-60 and~100 d were recognized in the power spectra of the meridional velocity and *** analysis indicated that the ISV at 50-60 d was caused by westward-propagating eddies at average propagation speed of~13 cm/s and wavelength of~635 *** ISV peak at~100 d was mainly caused by northward-propagating eddies generated in the North Equatorial Current *** investigation indicated that the ISV of the Kuroshio at 18°N is dominated by meridional transport,rather than by the zonal migration of the Kuroshio main *** findings provide a better understanding of the ISV of the Kuroshio east of Luzon Island.

关键词： intraseasonal variability(ISV) Kuroshio mooring observation eddy

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CMIP 6 models simulation of the connection between North/South Pacific Meridional Mode and ENSO

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Journal of oceanology and Limnology 2024年第2期42卷 439-453页

作者： Yunlong LU Junqiao FENG Dunxin hu Key Laboratory of Ocean Circulation and Waves Chinese Academy of SciencesQingdao 266071China institute of oceanology Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

The subtropical North and South Pacific Meridional Modes(NPMM and SPMM)are well known precursors of El Niño-Southern Oscillation(ENSO).However,relationship between them is not *** the early 1980,the relationship experienced an interdecadal *** in this connection can be attributed mainly to the phase change of the Pacific decadal oscillation(PDO).During the positive phase of PDO,a shallower thermocline in the central Pacific is responsible for the stronger trade wind charging(TWC)mechanism,which leads to a stronger equatorial subsurface temperature *** dynamic process strengthens the connection between NPMM and *** with the negative phase of PDO,a shallower thermocline over southeastern Pacific allows an enhanced wind-evaporation-SST(WES)feedback,strengthening the connection between SPMM and *** 35 Coupled Model Intercomparison Project Phase 6(CMIP6)models,we examined the NPMM/SPMM performance and its connection with ENSO in the historical *** great majority of CMIP6 models can reproduce the pattern of NPMM and SPMM well,but they reveal discrepant ENSO and NPMM/SPMM *** intermodal uncertainty for the connection of NPMM-ENSO is due to different TWC mechanism.A stronger TWC mechanism will enhance NPMM *** SPMM,few models can simulate a good relationship with *** intermodel spread in the relationship of SPMM and ENSO owing to SST bias in the southeastern Pacific,as WES feedback is stronger when the southeastern Pacific is warmer.

关键词： North and South Pacific Meridional Modes(NPMM and SPMM) El Niño-Southern Oscillation(ENSO) Pacific decadal oscillation(PDO) Coupled Model Intercomparison Project Phase 6(CMIP6)

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Heterotrophic bacteria of the Dapeng Bay in the South China Sea: community structure,abundance,and the relationships of culturablity with environmental factors

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Acta Oceanologica Sinica 2010年第4期29卷 88-97页

作者： JIANG Fajun hu Zhangli hu Chaoqun South China Sea institute of oceanology Chinese Academy of Sciences Guangzhou 510301 China Guangxi Academy of Sciences Nanning 530007 China College of Life Sciences Shenzhen University Shenzhen 518060 China

The community composition,abundance and culturablity of heterotrophic bacterioplankton in the Dapeng Bay of the South China Sea were investigated by morphological method,bacterial cultivation and biochemical methods over an annual *** and Pseudomonas were the predominant genera among the Gram-negative *** bacterioplankton abundance fluctuated from 2.07×10 8 to 2.44×10 9 cells/dm 3 ,and culturable bacteria abundance ranged between 0.1×10 6 and 16.07×10 6 CFU/dm 3 .The Culturablity of heterotrophic bacteria ranged between 0.01% and 1.31%.The relationship between bacterial culturablity and the environmental factors was also studied in different sites of the Dapeng *** the bay,a significantly positive relationship was evidenced between bacterial culturability and temperature,meanswhile bacterial culturability was significantly inversely related with *** positive relationship was shown at the central bay while a negative relationship was observed at the bay mouth and there was no significant correlation at top bay between bacterial culturablity and chlorophyll a of sea water.A positive relationship was found between culturability and DIN all the bay,but DIP showed a significantly negative relationship with bacterial culturability only at the mouth of the bay.

关键词： heterotrophic bacteria culturable bacteria culturablity environmental factors

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Variability of the Pacific subtropical cells under global warming in CMIP6 models

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Journal of oceanology and Limnology 2024年第1期42卷 24-40页

作者： Xue HAN Junqiao FENG Yunlong LU Dunxin hu Key Laboratory of Ocean Circulation and Waves Chinese Academy of SciencesQingdao 266071China institute of oceanology Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Laboratory for Ocean Dynamics and Climate Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China

The Pacific subtropical cells(STCs)are shallow meridional overturning circulations connecting the tropics and subtropics,and are assumed to be an important driver of the tropical Pacific decadal *** variability of STCs under global warming is investigated using multimodal outputs from the latest phase of the Coupled Model Inter-comparison Project(CMIP6)and ocean reanalysis ***,the volume transport diagnostic analysis is employed to evaluate how coupled models and ocean reanalysis products reproduce interior STC *** variation of heat transport by the interior STC under the high-emissions warming scenarios is also *** results show that the multimodal-mean linear trends of the interior STC transport along 9°S and 9°N are-0.02 Sv/a and 0.04 Sv/a under global warming,respectively,which is mainly due to the combined effect of the strengthened upper oceanic stratification and the weakening of wind *** is a compensation relationship between the interior STC and the western boundary transport in the future climate,and the compensation relationship of 9°S is more significant than that of 9°*** addition,compared with ocean reanalysis products,the coupled models tend to underestimate the variability of the interior STC transport convergence,and thus may lose some sea surface temperature(SST)driving force,which may be the reason for the low STC-SST correlation simulated by the *** future scenario simulation shows that the heat transport of interior STC is weakened under global warming,with a general agreement across models.

关键词： interior subtropical cell(STC) global warming Coupled Model Inter-comparison Project(CMIP6) western boundary transport

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Synergistic Interdecadal Evolution of Precipitation over Eastern China and the Pacific Decadal Oscillation during 1951-2015

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Advances in Atmospheric Sciences 2024年第1期41卷 53-72页

作者： Minmin WU Rong-hua ZHANG Junya hu Hai ZHI Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China School of Marine Sciences Nanjing University of Information Science and TechnologyNanjing 210044China Laosan Laboratory Qingdao 266237China School of Atmospheric Sciences Nanjing University of Information Science and TechnologyNanjing 210044China University of Chinese Academy of Sciences Beijing 100029China

By using the multi-taper method(MTM)of singular value decomposition(SVD),this study investigates the interdecadal evolution(10-to 30-year cycle)of precipitation over eastern China from 1951 to 2015 and its relationship with the North Pacific sea surface temperature(SST).Two significant interdecadal signals,one with an 11-year cycle and the other with a 23-year cycle,are identified in both the precipitation and SST *** show that the North Pacific SST forcing modulates the precipitation distribution over China through the effects of the Pacific Decadal Oscillation(PDO)-related anomalous Aleutian low on the western Pacific subtropical high(WPSH)and Mongolia high(MH).During the development stage of the PDO cold phase associated with the 11-year cycle,a weakened WPSH and MH increased the precipitation over the Yangtze River Basin,whereas an intensified WPSH and MH caused the enhanced rain band to move northward to North China during the decay *** the development stage of the PDO cold phase associated with the 23-year cycle,a weakened WPSH and MH increased the precipitation over North China,whereas an intensified WPSH and the weakened MH increased the precipitation over South China during the decay *** 11-year and 23-year variabilities contribute differently to the precipitation variations in the different regions of China,as seen in the 1998flooding *** 11-year cycle mainly accounts for precipitation increases over the Yangtze River Basin,while the 23-year cycle is responsible for the precipitation increase over Northeast *** results have important implications for understanding how the PDO modulates the precipitation distribution over China,helping to improve interdecadal climate prediction.

关键词： MTM-SVD PDO SST anomalies interdecadal variability precipitation over China

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