共查询到20条相似文献，搜索用时 204 毫秒
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青岛海水养殖技术开发公司 《海洋科学》1999,(6)
“中国科学院海洋研究所青岛海水养殖技术开发公司”同澳大利亚“Ａｑｕａｓｏｎｉｃ公司”合作研究开发出“奥阔卫士（ＡｑｕａＧｕａｒｄ）”牌水质测定试剂盒,该试剂盒有一系列产品,目前主要有测试两种ｐＨ值的（６．０×１０~（－６）～７．６,７．４～９、０）,测试氨氮（０．１×１０~（－６）～１０．０×１０~（－６）,此值即ｐｐｍ值,后同）、硬度、溶解氧（０．１×１０~（－６）～１０．０×１０~（－６））、硝酸盐（０×１０~（－６）～１６０×１０~（－６）、亚硝酸盐（０×１０~（－５）～２０×１０~（－６））、铜… 相似文献
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青岛海水养殖技术开发公司 《海洋科学》2000,24(5)
“中国科学院海洋研究所青岛海水养殖技术开发公司”同澳大利亚“Ａｑｕａｓｏｎｉｃ公司”合作研究开发出“奥阔卫士（ＡｑｕａＧｕａｒｄ）”牌水质测定试剂盒,该试剂盒有一系列产品,目前主要有测试两种ｐＨ值的（６．０～７．６,７．４～９．０）,测试氨氮（０．１×１０-６～１０．０×１０-６,此值即ｐｐｍ值,后同）、硬度、溶解氧（０．１×１０-６～１０．０×１０-６）、硝酸盐（０～１６０×１０-６）、亚硝酸盐（０～２０×１０-６）、铜离子（０．０５×１０-６～１．００×１０-６）、磷酸盐（０．１×１０-６～３．０×１０-… 相似文献
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青岛海水养殖技术开发公司 《海洋科学》2000,24(6)
“中国科学院海洋研究所青岛海水养殖技术开发公司”同澳大利亚“Ａｑｕａｓｏｎｉｃ公司”合作研究开发出“奥阔卫士（ＡｑｕａＧｕａｒｄ）”牌水质测定试剂盒,该试剂盒有一系列产品,目前主要有测试两种ｐＨ值的（６．０～７．６,７．４～９．０）,测试氨氮（０．１×１０-６～１０．０×１０-６,此值即ｐｐｍ值,后同）、硬度、溶解氧（０．１×１０-６～１０．０×１０-６）、硝酸盐（０～１６０×１０-６）、亚硝酸盐（０～２０×１０-６）、铜离子（０．０５×１０-６～１．００×１０-６）、磷酸盐（０．１×１０-６～３．０×１０-… 相似文献
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青岛海水养殖技术开发公司 《海洋科学》1999,(5)
“中国科学院海洋研究所青岛海水养殖技术开发公司”同澳大利亚“Ａｑｕａｓｏｎｉｃ公司”合作研究开发出“奥阔卫士（ＡｑｕａＧｕａｒｄ）”牌水质测定试剂盒,该试剂盒有一系列产品,目前主要有测试两种ｐＨ值的（６．０～７．６,７．４～９．０）,测试氨氮（０．１×１０－６～１０．０×１０－６,此值即ｐｐｍ值,后同）、硬度、溶解氧（０．１×１０－６～１０．０×１０－６）、硝酸盐（０～１６０×１０－６）、亚硝酸盐（０～２０×１０－６）、铜离子（０．０５×１０－６～１．００×１０－６）、磷酸盐（０．１×１０－６～… 相似文献
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青岛海水养殖技术开发公司 《海洋科学》2000,24(2)
“中国科学院海洋研究所青岛海水养殖技术开发公司”同澳大利亚“Ａｑｕａｓｏｎｉｃ公司”合作研究开发出“奥阔卫士（ＡｑｕａＧｕａｒｄ）”牌水质测定试剂盒 ,该试剂盒有一系列产品 ,目前主要有测试两种 ｐＨ值的（６．０～７．６,７．４～９．０） ,测试氨氮（０．１×１０-６～１０．０×１０-６ ,此值即ｐｐｍ值 ,后同）、硬度、溶解氧（０．１×１０ -６～１０．０×１０ -６）、硝酸盐（０×１０ -６～１６０×１０ -６）、亚硝酸盐（０×１０-６～２０×１０-６）、铜离子（０．０５×１０-６～１．００×１０-６）、磷酸盐（０… 相似文献
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１９９６年 ９～１０月在厦门湾上屿附近海域定点站连续６个航次测定了水柱中溶解态（ＤＴｈ）、颗粒态~(２３４)Ｔｈ（ＰＴｈ）和溶解态~２３８Ｕ,获得了~２３４Ｔｈ的时空分布图象。研究海域水柱中ＤＴｈ、ＰＴｈ和总~２３４Ｔｈ（ＴＴｈ）的放射性比度分别在０．８０～３．９５山／ｍ~３、１,９３～５．６５Ｂｑ／ ｍ~３和 ３．４７～９． １８Ｂｑ／ｍ~３之间,整个水柱中 ＤＴｈ、ＰＴｈ和ＴＴｈ均与~(２３８)Ｕ呈不平衡,其特征是~(２３４)Ｔｈ亏损,且亏损程度明显大于大洋水体。颗粒态~(２３４)Ｔｈ和总悬浮颗粒物（ＴＳＭ）在水体中的分布及其随时间的变化趋势相当一致,非生物过程可能对近岸海域水体中~(２３４)Ｔｈ的分布起着非常重要的作用。 相似文献
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青岛海水养殖技术开发公司 《海洋科学》2000,24(3):40
中国科学院海洋研究所青岛海水养殖技术开发公司”同澳大利亚“Ａｑｕａｓｏｎｉｃ公司”合作研究开发出“奥阔卫士（ＡｑｕａＧｕａｒｄ）”牌水质测定试剂盒,该试剂盒有一系列产品,目前主要有测试两种ｐＨ值的（６．０×１０-６～７．６,７．４～９．０）,测试氨氮（０．１×１０-６～１０．０×１０-６,此值即ｐｐｍ值,后同）、硬度、溶解氧（０．１×１０-６～１０．０×１０-６）、硝酸盐（０×１０-６～１６０×１０-６）、亚硝酸盐（０×１０-６～２０×１０-６）、铜离子（０．０５×１０-６～１．００×１０-６）、磷酸盐（０．１… 相似文献
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《海洋科学》2012,36(5)
通过测定花鳗鲡∞nguilliamarmorata）海南群体（HN）和菲律宾群体（PH）共19尾个体的线粒体D．100p基因的核苷酸序列（约1017bp）,分析了花鳗鲡的种群遗传结构。结果表明：A、T、G、C4种核苷酸的平均含量分别为39．8％、28_3％、12．4％、19．4％,A＋T含量（68．1％）明显高于G＋C含量（31．8％）。所测序列中存在73个变异位点,共有18个单倍型。其中海南群体的单倍型多样度（删）、核苷酸多态性（Pi）、平均核苷酸差异数（纠分别为0．982、0．21577和219．655,而菲律宾群体的单倍型多样度、核苷酸多态性、平均核苷酸差异数分别为1．000、0．26728和271．821,两个群体之间平均遗传距离（P）为0．3203。结果表明2个群体遗传变异较大,菲律宾群体的遗传多样性较海南群体更加丰富。通过构建NJ分子系统树表明2个群体的亲缘关系较近。利用中性检验Tajima’s D（海南群体D=I．35345,P〉0．01;菲律宾群体D=0．79220,P〉0．01）和Fs（海南群体Fs=3．759;菲律宾群体Fs=2．231）探讨其种群历史,表明花鳗鲡群体进化过程种群数量较为稳定。 相似文献
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The genetic structure of the exotic ascidian Styela plicata (Tunicata) from Italian ports,with a re‐appraisal of its worldwide genetic pattern 
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下载免费PDF全文 Ferruccio Maltagliati Lisa Lupi Alberto Castelli Federica G. Pannacciulli 《Marine Ecology》2016,37(3):492-502
The pleated ascidian Styela plicata (Lesueur, 1823) is a solitary species commonly found in ports and marinas around the world. It has been recorded in the Mediterranean region since the mid‐19th century. In the present work, the species’ genetic diversity was analysed, employing a 613‐bp portion of the mitochondrial cytochrome c oxidase subunit I (COI) gene from 149 individuals collected in 14 ports along Italian coasts at spatial scales ranging from 1 to approximately 2200 km. Haplotype and nucleotide diversity values were h = 0–0.933 (total h = 0.789) and π = 0–0.145 (total π = 0.0094), respectively. A general southward trend of increasing within‐population genetic diversity was observed. Analysis of molecular variance revealed significant genetic structuring but no significant differences were detected among basins, and no isolation by distance was found. Our data were integrated with the COI sequences available from previous studies and re‐analysed in order to investigate the possible routes of introduction of this ascidian into the Mediterranean Sea. The presence of the two COI haplogroups detected in previous molecular investigations on S. plicata at intercontinental spatial scale was confirmed in the Mediterranean Sea. The results revealed multiple introductions of S. plicata, although some locations appear to have experienced rapid expansion from few founding individuals with reduced genetic diversity. However, continuous introductions would confound the pattern deriving from single founder events and make it difficult to estimate the time needed for gene diffusion into established populations. This mixing of effects creates difficulties in understanding the past and current dynamics of this introduction, and managing this alien invasive ascidian whose genetic structure is continuously shuffled by vessel‐mediated transport. 相似文献
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本研究采用平板分离法对具有典型症状的斜带髭鲷（Hapalogenys nitens）进行病原微生物的分离培养，结合形态学、生理生化特征和分子生物学技术对病原进行种属鉴定，并对分离得到的病原菌进行了药物敏感性试验。病理切片结果显示，病鱼肝脏、脾脏、鳃、头肾、心脏均可观察到明显的白色炎性肉芽肿病灶，从患病鱼脾脏、肝脏和头肾的白色结节处均分离到单一外观的细菌菌落hn-1。通过生理生化特征鉴定、16S rRNA基因测序和回归感染实验证实斜带髭鲷内脏白点病的致病菌为哈维氏弧菌（Vibrio harveyi）。透射电镜观察显示分离菌具有极生鞭毛及侧鞭毛；毒力基因检测显示分离菌携带toxR、luxR、vvh、vhh和trh基因；药敏试验结果显示，分离菌株主要对喹诺酮类、氨基糖苷类、四环素类等药物具有较强的敏感性。研究结果可为斜带髭鲷的内脏白点病的病害防控提供科学依据。 相似文献
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Abstract
Oncaea venusta Philippi, 1843 has been known as having some different size groups, but recent genetic study for cyt b and ITS 1 (Elverset al. 2006) suggests that these size groups can be considered as different species. Of these size groups, the largestO. venusta Philippi and the smallestO. venella Farran, 1929 were first described in Korean waters. The latter is easily distinguishable from the former in the following
characteristics in addition to its small size: (1) length to width ratio of genital double somite of two genders smaller,
and (2) female second pediger bearing inconspicuous dorso-posterior swelling.Oncaea venusta andO. venella co-occur in Korean waters during spring to fall, but their occurrence patterns seasonally differ: the former shows higher
density in fall while the latter does in summer. 相似文献
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利用水生动物急性毒性实验方法,在6个浓度下Cd2+对青蛤的急性毒性进行测定,经回归分析后,得到Cd2+对青蛤96h半致死浓度为20.09mg/L,安全浓度为0.201mg/L。分别对半致死浓度和安全浓度下Cd2+在青蛤体内不同组织的蓄积情况进行了分析。结果表明,在半致死浓度条件下,168h青蛤各组织Cd2+的含量依次为肌肉内脏团鳃;而在安全浓度下,其结果为内脏团鳃肌肉,内脏团对于Cd2+富集能力远高于肌肉。讨论了青蛤的养殖环境及产品检验等问题。 相似文献
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Glycogen, a polymer of glucose, is an important means of storing energy. It is degraded by glycogen phosphorylase (GPH) and hexokinase (HK), glycogen phosphorylase, and hexokinase cDNAs (Ca-GPH andCa-H... 相似文献
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本文通过延时摄影技术探究了不同刺参规格（小规格、中规格和大规格）及饥饿状态（饥饿0 d、5 d、10 d和15 d）对其集群行为的影响。研究发现：不同规格刺参的聚集率和标准聚集规模之间存在显著差异（P<0.05），且呈现出随刺参规格增大而升高的趋势，表明大规格刺参更倾向于聚集，且形成的集群规模更大；除饥饿10 d和饥饿15 d的组外，各处理组之间刺参聚集率和标准聚集规模都具有显著差异（P<0.05），随着饥饿时间的延长，刺参聚集率和标准聚集规模呈先降低，后升高，再保持稳定的规律。上述结果查明了规格和饥饿对刺参集群行为的影响，可为丰富刺参行为学研究及优化刺参增养殖管理策略提供理论依据。 相似文献
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The seasonal occurrence and reproductive strategy of the nemertean Tetrastemma fozensis, which inhabits the mantle cavity of the bivalve Scrobicularia plana, was studied through the analysis of the temporal diversity of a T. fozensis population. Bimonthly sampling was carried out from February 2001 to January 2002 at mudflats of Villaviciosa estuary (Asturias, Northern Spain). Nemerteans were found throughout the study period, but variations in their abundance were detected, with a maximum during winter months and a minimum during summer months. Moreover, variations in mean size of nemerteans were found, with maximal sizes at the end of the spring and the beginning of the summer and minimum size at early autumn. The annual variations in population parameters (decrease in abundance and complete disappearance of large individuals in summer) suggest that T. fozensis has a distinct reproductive season and a semelparous reproductive strategy. 相似文献
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Gil Penha-Lopes Steven Bouillon Perrine Mangion Adriano Macia Jos Paula 《Estuarine, Coastal and Shelf Science》2009,84(3):318-325
Population structure and distribution of Terebralia palustris were compared with the environmental parameters within microhabitats in a monospecific stand of Avicennia marina in southern Mozambique. Stable carbon and nitrogen isotope analyses of T. palustris and potential food sources (leaves, pneumatophore epiphytes, and surface sediments) were examined to establish the feeding preferences of T. palustris. Stable isotope signatures of individuals of different size classes and from different microhabitats were compared with local food sources. Samples of surface sediments 2.5–10 m apart showed some variation (−21.2‰ to −23.0‰) in δ13C, probably due to different contributions from seagrasses, microalgae and mangrove leaves, while δ15N values varied between 8.7‰ and 15.8‰, indicating that there is a very high variability within a small-scale microcosm. Stable isotope signatures differed significantly between the T. palustris size classes and between individuals of the same size class, collected in different microhabitats. Results also suggested that smaller individuals feed on sediment, selecting mainly benthic microalgae, while larger individuals feed on sediment, epiphytes and mangrove leaves. Correlations were found between environmental parameters and gastropod population structure and distribution vs. the feeding preferences of individuals of different size classes and in different microhabitats. While organic content and the abundance of leaves were parameters that correlated best with the total density of gastropods (>85%), the abundance of pneumatophores and leaves, as well as grain size, correlated better with the gastropod size distribution (>65%). Young individuals (height < 3 cm) occur predominantly in microhabitats characterized by a low density of leaf litter and pneumatophores, reduced organic matter and larger grain size, these being characteristic of lower intertidal open areas that favour benthic microalgal growth. With increasing shell height, T. palustris individuals start occupying microhabitats nearer the mangrove trees characterized by large densities of pneumatophores and litter, as well as sediments of smaller grain size, leading to higher organic matter availability in the sediment. 相似文献