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岛,大海的骊珠,沧桑巨变之手。故意把无尽的谜底,一半托出水面,一半留在海底,于是,就有了关于岛的趣闻轶事。——题记以神秘称趣复活节岛:因荷兰探险家罗及文1772年复活节那天在太平洋看到它,以为是自己新发现,故命名。岛上有1000多座奇异的巨大石雕像,关于石像来历,岛上居民也不知晓。更令人不解的是,岛上保存的26块“会说话的木板”,刻满奇特文字,没谁知道写的是什么,至今仍是个谜。择捉岛:是日本要求俄罗斯归还的北方四岛之一,亦为世界四大谜岛之一。其南部遍布一块块打磨圆滑的巨石,黑、灰、褐、浅绿皆有。石上刻满奇异线条花纹,有人猜是文字。黑曜石上刻符号,有飞鸟,有箭头。 相似文献
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对厦门5头中华白海豚成体和6头哺乳期的幼仔,进行齿的形态,齿式,内部构造和磨损情况的研究;根据齿的切片判断年龄,5头成体9-30岁,年龄大小和体表颜色及齿的磨损程度密切相关。出生后幼仔齿包埋在齿龈中,其齿数齿式和成体一样。 相似文献
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利用化石鱼牙齿的Sr同位素对深海粘土高精度测年B.L.Ingram为开展Sr同位素高精度地层学在深海粘土中的应用.本项研究中所用的远洋粘土样品于1992年取自ODP145航次(北太平洋断面)在ODP885和886钻孔中,远洋粘土沉积物每1.5m取10... 相似文献
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A molecular phylogeny is presented for the subfamily Dorippinae (including 9 individuals, representing 5 species and 4 genera), based on the sequence data from 16S rRNA gene. Two-cluster test between lineages in these phylogenetic trees has been performed. On the basis of rate constancy, the rate of nucleotide substitutions of 16S rDNA sequence data is estimated as 0.27% per million years. The analysis strongly supports the recognition of the Dorippinae as a monophyletic subfamily. Phylogenetic tree indicates that the subfamily Dorippinae is divided into two main clades, and genus Dorippe appears basal in the subfamily, diverging from other species 36.6 Ma ago. It is also clear that the Heikea is closely related to the genus Neodorippe. The divergence time between them is 15.8 Ma. 相似文献
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科学家们对海洋资源的开发研究表明占地球表面71%的海洋是一个蕴藏许多高效药理活性物质的巨大宝库。“向海洋要新药”已成为药学研究的新课题。生活在太平洋底的盲鳗,是一种十分奇特的鱼。它竟有4个心脏,科学家们从它身上发现了一种可以用于治疗心脏律失调的物质,以其为原料制成的药是理想的高效强心剂。这种药剂一能增加心脏向血管输送的血量;二能降低心跳频率。有报告说,在原苏联顿河入海口淤泥中生活的盲鳗,它的心脏能分泌出一种强烈的兴奋剂。人们只要服用很少一点这种分泌物,就可以使心脏输出的血液成倍增加。从而避免心力… 相似文献
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Isolation and identification of a marine killer yeast strain YF07b and cloning of the gene encoding killer toxin from the yeast 总被引:1,自引:0,他引:1
It was found that the marine yeast strain YF07b could secrete a large amount of killer toxin against a pathogenic yeast strain WCY which could cause milky disease in Portunus trituberculatus.The marine yeast strain YF07b was identified to be Pichia anomala according to the results of routine yeast identification and 18S rDNA and ITS sequences.The gene encoding killer toxin in the marine yeast strain YF07b was amplified by PCR technology.After sequencing,the results show that an open reading frame,consisting of 1 281 bp,encoded a presumed protein of 427 amino acids.The sequence of the cloned gene was found to have 99% match with that of the gene encoding killer toxin in Pichia anomalas strain K.A signal peptide including 17 amino acids appeared in the N-terminal domain of the killer toxin.Therefore,the mature protein consisted of 410 amino acids,its molecular mass was estimated to be 47.4 ku and its isoelctronic point was 4.5. 相似文献
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戴聪杰 《海洋通报(英文版)》2005,7(1):77-81
Twelve species of crustacean from Fujian coast were examined for lectins with different animal erythrocytes. Serum extracts fromall of 12 species showed agglutinating activity against at least two types of the erythrocytes used, which revealed the existence of lectins in these species. There were five species ( Penaeus japonicus, Lophosquilla costata, Charybdis feriatus, Portunus pelagicus, Scylla serrata ) whose serums could agglutinate all the erythrocytes tested. The lowest serum protein concentration required to produce erythrocytes agglutination varied remarkably, ranging from 0.7 μg/mL to 8 080 μg/mL. The strongest activity was shown in the agglutination of rabbit erythrocyte by serum of Penaeus vanaminas. Inhibition assays performed with seven mono- and bisaccharides showed that agglutination of quail erythrocytes by serums of three species (Portunus pelagicus, Scylla serrata and Sesarma sp. ) were not inhibited by any sugars, while others were inhibited by at least three types of sugars. The assay of temperature influence on agglutinating activity showed that only Penaeusjaponicus retained activity when the serum was heated to 90℃, and other serums lost their activity at 40 ℃, 50 ℃, 60 ℃, 70 ℃, 80 ℃ for 10 minutes, respectively. 相似文献
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B.Z.BIAN S.EGUSA 《山东海洋学院学报》1986,16(4):212-212
Atkinsiella hamanaensis sp. nov. a marine mastigomycete isolated from ova of the mangrove crab. scylla serrata (Forsskal). is described and illustrated The fungus grew over a temperature range of 15-32℃. with an optimum of 29-32℃ Its growth was observed in peptone-yeast extract glucose broth containing 1-5%NaCl. 相似文献
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在西欧,率先发起大规模航海探险活动的国家是葡萄牙.正如每一次成功都不会是偶然的,成功总是青睐于那些有准备人的.葡萄牙作为大航海时代最早的受益者,也并不是偶然的.为什么幸运女神会格外眷顾葡萄牙人呢?这就不得不提到一个传奇人物--葡萄牙的恩里克王子. 相似文献
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介绍周世杰老中医运用药对诊治喉科疾病的经验。周老认为喉科疾病初期、急性期多为火邪作祟,具有发病急、变化快的特点,致病因素以风、火、痰、热为主,病性属实;缓解期及后期病性多虚实夹杂,包含气滞血瘀、肺肾阴虚、中气亏虚等。其治疗喉科疾病,在辨证选方基础上善用药对,以加强疗效。其常用药对有七对,如利咽疗喉药对:六角仙、卤地菊;清利湿热药对:黄蜀葵、积雪草;清热祛痰药对:胆南星、天竺黄;软坚散结药对:生牡蛎、海浮石;宣通鼻窍药对:鹅不食草、细辛;扶正补虚药对:仙鹤草、淫羊藿;解毒疗疮药对:连翘、马勃。临床应用药对治疗喉科疾病,疗效肯定,值得参考借鉴。 相似文献
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