搜索结果: 151-165 共查到“知识库 海洋科学”相关记录8818条 . 查询时间(5.808 秒)
Micro- to Fine-Scale Chemical Gradients and Layers in Stratified Coastal Waters
Stratified Coastal Waters Chemical Gradients and Layers
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2015/8/6
Models of biogeochemical dynamics and chemical variability in coastal waters have traditionally relied on the assumption that small-scale mixing processes are sufficiently strong and isotropic to rapi...
A Model for the Reflectance of Thin Layers, Fronts, and Internal Waves and Its Inversion
Thin Layers Fronts Internal Waves
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2015/8/6
The interplay of physical and biogeochemical processes in the ocean can result in well-defined vertical gradients and maxima in biological properties. When these gradients and maxima exist near the se...
Ecology of a Chaetoceros socialis Lauder Patch on Georges Bank: Distribution, Microbial Associations, and Grazing Losses
Georges Bank: Distribution Microbial Associations
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2015/8/6
The presence of patches and layers in marine pelagic ecosystems may play an important role in providing food for higher trophic levels at concentrations high enough to support the metabolism, growth, ...
We are all familiar with the irregular profiles from modern, high resolution conductivity-temperature-depth profilers (commonly called CTDs) freely falling vertical profilers, and towed thermistor cha...
A general approach for quantitative classification of littoral sites has been developed. The approach uses dimensionless parameters to describe the processes in a specific area of physics (e.g., ocean...
Thin Layers: Observations of Small-Scale Patterns and Processes in the Upper Ocean
Small-Scale Patterns Processes
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2015/8/6
Fore decades, marine scientists have been asking questions about the response of planktonic distributions and processes to physical forcing across a range of temporal and spatial scales. The mismatch ...
Acoustical Sensing of Small-Scale Vertical Structures in Zooplankton Assemblages
Small-Scale Vertical Structures Zooplankton Assemblages
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2015/8/6
Observation of aquatic animals in their natural environments remains a major challenge in both biological oceanography and limnology. Critical processes in feeding, reproduction, growth, and predation...
Simultaneous Imaging of Phytoplankton and Zooplankton Distributions
Phytoplankton Zooplankton Distributions
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2015/8/6
Understanding the dynamics of the relationship between phytoplankton and higher trophic levels is necessary for understanding the transfers of matter and energy through planktonic food webs. There hav...
基于高通量测序的二长棘鲷微卫星标记开发与评价
二长棘鲷 微卫星 高通量测序
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2015/12/9
采用高通量测序法对二长棘鲷（Parargyrops edita）基因组进行高通量随机测序，从测序结果中搜索微卫星位点，根据搜索结果设计聚合酶链式反应（PCR）引物，并根据PCR产物质量对引物进行筛选，使用一个二长棘鲷野生群体对通过筛选的微卫星标记的种群遗传学特征进行评价。结果共获得二长棘鲷基因组拼接序列0.12 Gbp，从中搜索得到侧翼长度≥250 bp的微卫星序列292条。根据微卫星序列搜索结果...
黄姑鱼基因组大小和染色体物理长度的测定
黄姑鱼 基因组大小 图像分析 物理长度
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2015/12/9
该研究以鸡（Gallus gallus）红细胞含量为标准，采用流式细胞术首次测定了黄姑鱼（Nibea albiflora）基因组大小；利用荧光染色和显微图像分析软件测定了24对染色体的相对面积和累积光密度（IOD），并基于IOD估算了各对染色体的物理长度。结果显示，黄姑鱼基因组大小为（595.70 ± 24.08）Mb，DNA质量约为（0.61 ± 0.02）pg。黄姑鱼基因组包括24对端部着丝粒...
该实验设置3个盐度梯度（9、16、23，分别记为S9、S16、S23），其中S23为对照组，对黄姑鱼（Nibea albiflora）幼鱼进行低盐度胁迫，于第0、第1、第3和第7天进行取样。通过检测肝脏超氧化物歧化酶（SOD）、过氧化氢酶（CAT）、谷胱甘肽过氧化酶（GSH-Px）和总抗氧化能力（T-AOC），以及肝脏和血清的丙二醛（MDA）质量摩尔浓度，研究低盐度对黄姑鱼抗氧化系统的影响。结果显...
养殖密度对凡纳滨对虾杂交和自交子一代生长与成活的影响
凡纳滨对虾 养殖密度 生长 成活
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2015/12/9
为开展适合高密度养殖的凡纳滨对虾（Litopenaeus vannamei）新品系选育提供参考，以不同国家和地区的8个凡纳滨对虾养殖群体作为亲本，构建8个子代群体；在80 尾•m-2、200 尾•m-2和400 尾•m-2养殖密度下研究各群体生长、成活性状。结果表明，养殖密度对各群体生长、成活性状有显著影响（P < 0.05），随着养殖密度增大，生长、成活指标呈...
文章探讨了刺参（Apostichopus japonicus）亲本南方驯化和囊胚期幼体热应激对浮游幼体生长、发育的影响。刺参亲本分为未度夏（DA）组和已度夏（XP）组，每组设置对照组（C）和热应激组（H），在囊胚期对H组进行45 min、26 ℃的高温应激，然后分别在18 ℃和23 ℃下培育至变态。结果表明，培育温度对H组和C组幼体的生长有显著影响，C组幼体在23 ℃下的特定生长率高于18 ℃，而...
脊椎骨常用于鉴定鱼类年龄，但脊椎骨也包含了摄食信息，这方面的研究在国外也刚起步。文章以大洋性鲨鱼——大青鲨（Prionace glauca）脊椎骨为样品，对椎体中心（椎心）、椎心与外缘的中间部位（中部）、椎体外缘（外缘）3个部位的碳、氮稳定同位素比值（δ13C、δ15N）和由此估算的营养级进行比较研究。结果表明，样品的δ13C值、δ15N值和营养级范围分别为-16.64‰ ~ -13.08‰、9....