Differential gene expression in the body wall of the sea cucumber(Apostichopus japonicus) under strong lighting and dark conditions     

ZHANG Libin  FENG Qiming  SUN Lina  FANG Yan  XU Dongxue  ZHANG Tao  YANG Hongsheng 《海洋学报(英文版)》2018,(5)

Sea cucumber, Apostichopus japonicus is very sensitive to light changes. It is important to study the influence of light on the molecular response of A. japonicus. In this study, RNA-seq provided a general overview of the gene expression profiles of the body walls of A. japonicus exposed to strong light("light"), normal light("control") and fully dark("dark") environment. In the comparisons of "control" vs. "dark", "control" vs. "light" and "dark" vs."light", 1 161, 113 and 1 705 differentially expressed genes(DEGs) were identified following the criteria of|log_2 ratio|≥1 and FDR≤0.001, respectively. Gene ontology analysis showed that "cellular process" and "binding"enriched the most DEGs in the category of "biological process" and "molecular function", while "cell" and "cell part" enriched the most DEGs in the category of "cellular component". And the DEGs were mapped to 214, 41 and229 pathways in the Kyoto Encyclopedia of Genes and Genomes database, and 51, 2 and 57 pathways were significantly enriched, respectively. Light-specific DEGs identified in this study will be important targets for further investigation to establish the biochemical mechanisms involved in the adaption of this sea cucumber to changes in the level of environmental light.  相似文献   

Petrology and geochemistry of komatiites and tholeiites from Gorgona Island,Colombia   总被引：2，自引：0，他引：2  

Aitken  Bruce G.  Echeverría  Lina M. 《Contributions to Mineralogy and Petrology》1984,86(1):94-105

Komatiitic rocks from Gorgona Island, Colombia, in contrast to their Archaean counterparts, occur as rather structureless flows. In addition, textural and mineralogical features indicate that the Gorgona komatiites may have crystallized from superheated liquids. Komatiitic rocks have MgO contents which range from 24 to 11 wt.% and plot on well-defined olivine (Fo₉₀) control lines. Calculations show that potential evolved liquids (MgO<11 wt%) will be SiO₂-poor. Komatiites, in this case, cannot be regarded as parental to the associated tholeiitic basalt sequence.On the basis of REE concentrations and Sr, Nd isotopic compositions, the associated basalts are found to be of two types. One type (K-tholeiite) is characterized by noticeably fractionated REE patterns and relatively primitive isotopic compositions similar to those of the komatiites. K-tholeiites, together with komatiites, are regarded as comprising a distinctive komatiitic suite. REE patterns within this suite show progressive depletion in the LREE from K-tholeiites to komatiites, and represent increasingly higher degrees of melting of the same mantle source region. The other type (T-tholeiite), representative of the bulk of the exposed basalt sequence, has flat REE patterns and relatively evolved isotopic compositions. This tholeiitic suite is clearly genetically unrelated to the komatiitic suite.  相似文献   

Pyroclastic rocks: another manifestation of ultramafic volcanism on Gorgona Island,Colombia   总被引：5，自引：0，他引：5  

Lina M. Echeverría  Bruce G. Aitken 《Contributions to Mineralogy and Petrology》1986,92(4):428-436

Tertiary ultramafic volcanism on Gorgona Island, Colombia, is manifested not only by komatiite flows, but also by a more voluminous sequence of tuff breccias, which is cut by comagmatic picrite dikes. The ultramafic pyroclastic rocks are chaotic to stratified mixtures of angular to subrounded glassy picritic blocks and a fine grained volcaniclastic matrix that consists primarily of plastically-deformed, glassy globules. The entire deposit is interpreted to have formed by an explosive submarine eruption of phenocryst-laden picritic magma. MgO contents of tuff breccias and picrite dikes range from 21 to 27 wt%. Relative to nearby komatiite flows, these rocks are MgO-rich, and FeO-, TiO₂- and Ni-poor. HREE concentrations are very low (N<0.2), indicating derivation from a more highly depleted mantle source region. Nd isotopic data suggest a cogenetic relationship between the picritic magma that formed the tuff breccia and associated dikes and that which produced the komatiite flows. Nevertheless Pb isotopic data as well as whole rock geochemistry preclude such a connection, either due to olivine fractionation/accumulation or to different degrees of partial melting. These ultramafic rock types crystallized from magmas which most likely were extracted from distinct mantle source regions.  相似文献   

车载激光点云道路边界提取的Snake方法   总被引：2，自引：0，他引：2  

方莉娜  卢丽靖  赵志远  王昀昀  陈崇成 《测绘学报》1957,49(11):1438-1450

针对车载激光点云中道路边界提取困难,自动化程度低的问题,提出一种基于离散点Snake的车载激光点云道路边界提取方法。不同于传统基于图像建立Snake,本文直接基于离散点建立Snake模型。先利用伪轨迹点数据,确定初始轮廓位置,参数化不同类型的道路边界初始轮廓;然后基于离散点构建适合多类型道路边界的Snake模型,定义模型内部、外部和约束能量,通过能量函数最小化推动轮廓曲线移动到显著道路边界特征点处,实现不同道路边界的精细提取。本文试验采用3份不同城市场景的车载激光点云数据验证本文方法的有效性,道路边界提取结果的准确率达到97.62%,召回率达到98.04%,F1-Measure值达到97.83%以上,且提取的道路边界结果与软件交互提取的结果有较好的吻合度。试验结果表明,本文方法能够修正噪声、断裂等数据质量对道路边界提取的影响,能够实现各类复杂城市环境中不同形状道路边界的提取,具有较强的稳健性和适用性。  相似文献   

洱源FD-105K与FD-125测氡仪对比观测分析     

段美芳  李庆  陆丽娜  字承柱  李燕池 《地震地磁观测与研究》2020,41(2):123-129

选取2015—2019年洱源水化站FD-105K与FD-125测氡仪对比观测资料,采用一阶差分、F检验、t检验等方法进行对比分析,结果显示:FD-125测氡仪测值总体偏低,且测量精度较低,数据离散程度较高;2套观测数据变化趋势一致性不理想,相关性较低,未通过F检验和t检验。综合分析认为,FD-125测氡仪暂时不能替代FD-105K测氡仪进行观测,需要增加震例对2套仪器的映震效能进行验证。  相似文献   

Towards urbanisation of the non-hydrostatic numerical weather prediction model Lokalmodell (LM)     

Lina Neunhäuserer  Barbara Fay  Matthias Raschendorfer 《Boundary-Layer Meteorology》2007,124(1):81-97

Numerical weather prediction models are increasingly employed for providing meteorological data for urban air quality applications. Model resolution, physiographic parameters and surface-layer parameterisations need to be adapted to the requirements of the urban boundary layer. The Lokalmodell of the German Weather Service was triple-nested down to a horizontal grid resolution of 1.1 km, urbanised physiographic parameters were implemented, and an additional anthropogenic heat source was introduced. Results of a sensitivity study for a spring dust episode in Helsinki show a clear urbanisation effect of these measures on temperature, humidity and the partitioning of surface fluxes, leading to an increased Bowen ratio and heat storage and an urban heat island effect.  相似文献   

洛阳市暴雨时空分布特征     

Guan Lina  Zhang Lijuan  Ren Jian  Feng Linfan  Liu Jingli 《河南气象》2007,(Z1)

对洛阳市1961-2005年10个站逐日雨量资料统计分析结果表明:洛阳暴雨集中在7-9月,且7-8月单站暴雨较多。有2个暴雨多发区域中心,一个在北部的丘陵区,另一个在南部山区。年区域暴雨出现≥4次时,有准3 a的周期变化规律;≤3次时,有准5 a的周期变化规律。  相似文献   

卫星遥感数字正射影像（RSDOM）局部变形的处理     

穆利娜  李发红 《测绘技术装备》2007,9(1):31-32

在利用卫星遥感数字正射影像(RSDOM)进行数字线划地图(DLG)更新中,多源遥感影像经几何纠正、融合后存在局部变形,严重影响着后序的更新。结合生产实践,本文提出一些解决局部变形的方法。  相似文献   

车载激光点云中交通标线自动分类与矢量化     

方莉娜  王爽  赵志远  付化胜  陈崇成 《测绘学报》2021,50(9):1251-1265

交通标线是重要的交通安全设施,其位置、属性和拓扑关系精细刻画道路交通结构,是智能交通、高精地图、位置与导航等应用的基础数据.本文提出一种融合空间上下文信息的车载激光点云标线分类图注意力模型(graph attention network with spatial context information,GAT_SCNet).该模型利用图结构建立标线及其邻接对象的出现和依存关系,基于标线几何、拓扑、空间结构关系构建注意力机制进行节点特征动态更新,通过对节点分类实现标线的精细分类.基于分类后标线,设计不同方案实现对分类后标线提取标线矢量化数据.试验采用4份不同车载激光扫描系统获取的城市与高速场景数据验证本文方法的有效性,试验结果中9类标线分类的准确率分别为100.00％、93.77％、100.00％、100.00％、100.00％、96.73％、97.96％、100.00％、98.39％,召回率分别为100.00％、96.36％、100.00％、100.00％、100.00％、97.26％、85.72％、100.00％、94.16％.结果表明,本文方法能实现道路场景中全尺寸、多类型标线对象的精确识别,并对形状相似标线(如虚线、斑马线和停止线)的区分具有较强稳健性.  相似文献   

融合点云和多视图的车载激光点云路侧多目标识别     

方莉娜  沈贵熙  游志龙  郭迎亚  付化胜  赵志远  陈崇成 《测绘学报》2021,50(11):1558-1573

城市环境中的行道树、车辆、杆状交通设施是重要的交通地物,也是智能交通,导航与位置服务,自动驾驶和高精地图等行业应用的核心要素.为了准确识别这些路侧目标,本文提出一种融合点云和多视角图像的深度学习模型PGVNet(point-group-vi ew network),充分利用目标点云数据中空间几何信息及其多视角图像中高级全局特征提升路侧行道树、车辆和杆状设施的分类精度.为了减少视图间的冗余信息并增强显著视图特征,PGVNet模型利用预训练的VGG网络提取多视图特征,对其进行分组赋权获取最优视图特征;采用嵌入注意力机制的融合策略,利用最优视图特征动态调整PGVNet模型对点云不同局部关系的注意力度,学习不同路侧目标的多层次、多尺度显著特征,实现行道树、车辆和杆状交通设施的精确分类.试验采用5份不同车载激光扫描系统获取的不同城市场景数据验证本文方法的有效性,其中行道树、车辆及杆状交通设施分类结果中的准确率、召回率、精度和F1指数分别达(99.19％、94.27％、93.58％、96.63％);(94.20％、97.56％、92.02％、95.68％);(91.48％、98.61％、90.39％、94.87％).结果表明,本文方法融合多视图全局信息和点云局部结构特征可以有效区分城市场景中的行道树、车辆和杆状交通设施,可为高精度地图中要素构建与矢量化提供数据支撑.  相似文献