共查询到20条相似文献，搜索用时 31 毫秒
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《Marine Ecology》1985,6(4):365-366
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M. Gürgze 《Ocean Engineering》2002,29(13):1725-1729
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R. Kirby 《Marine Geology》1973,14(3):M11-M14
A perspex disc produced for the purpose of sizing unconsolidated sediment samples in the field has eight segmented compartments where standard samples ranging from granules to clay are sited. The sample to be sized is placed over the clear perspex area of the disc and sized by visual comparison with the fractions in the segments. 相似文献
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以研究晚更新世以来海面变化、测量、对比及其应用为主的国际地质对比计划第200号项目1986年度会议于1986年10月9—14日在中国青岛、烟台两地举行。来自24个国家和地区的104名代表参加了这次会议。会议收到论文摘要80余篇,30余名国内外专家在会上作了学术报告,部分代表还向大会展示了研究成果。 相似文献
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F.G. Thomas 《Marine Chemistry》1974,2(4):318-319
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A few species in the genus Grateloupia (Halymeniaceae,Rhodophyta) have been investigated in detail with respect to morphological observations and molecular analyses.In this study,the authors document the vegetative and reproductive structures of two new species of Grateloupia,G.dalianensis H.W.Wang et D.Zhao,sp.nov.and G.yinggehaiensis H.W.Wang et R.X.Luan,sp.nov.They both have the morphological character that carpogonial ampullae and auxiliary cell ampullae are the simple Grateloupia-type.The two species can be distinguished from other species of the genus by their distinctive morphological features respectively.Based on ribulose-1,5-bisphosphate carboxylase/oxygenase (rbcL) gene sequences,the phylogenetic tree obtained in the study indicated that they are both embedded within the Grateloupia clade.G.dalianensis clusters a subclade with G.asiatica,and G.yinggehaiensis forms a single monophyletic subclade with G.hawaiiana. 相似文献
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Fourteen proteins and 12 morphometric characters were examined in specimens of blue maomao and sweep to resolve the question: Are they one or two species? Specimens were fixed for the same alleles at 12 protein loci and shared alleles at 4 polymorphic loci. At a further polymorphic locus they differed in allele frequency and at three loci they did not share alleles. A genetic distance of 0.209 was found between blue maomao and sweep suggesting that they diverged about 1 million years ago. One meristic character showed a difference between specimens. On the basis of the electrophoretic data and on gill raker counts it is considered that blue maomao and sweep are two separate species. In view of reported differences from Australian specimens the allocation of scientific names at least to sweep remains uncertain. 相似文献