以下为句子列表：
英文: Two major difficulties inherent in this concept are the lack of any known sialic meteorites, and the high probability that the energy of impact would result in a wide dissemination of sialic material, rather than its concentration at the point of impact.
中文: 拿月亮和火星来说，一般都从它们表面严重的陨石坑得出结论：它们在其地质进化过程中遭到过巨大的陨星的撞击。
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英文: ISOLATION OF SIALIC ACID FROM HOG BLOOD
中文: 猪血中唾液酸的分离纯化工艺
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英文: In cases of mucoid adenocarcinoma and 0 cases of signet ring cell carcinoma, there was a marked reduction of mueoitin sulfate with an increase in sialic acid mucus.
中文: 例粘液腺癌和 0例印戒细胞癌,硫酸粘液显著减少,唾酸粘液明显增多。
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英文: Polysialic acid is a unique carbohydrate composed of a linear homopolymer of α,8-linked sialic acid, and is mainly attached to the neural cell adhesion molecule (NCAM) via a typical N-linked glycan in vertebrate neural system.
中文: 多聚唾液酸(polysialic acid,PSA)是一类线性、均一多聚α,8连接唾液酸的独特碳水化合物,它主要通过典型的N-连接糖苷键附着在脊椎动物神经系统神经黏附分子(neural cell adhesion molecule,NCAM)上。
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英文: Serum levels of sialic acid (SA) in 0 normal persons, cases of atherothrombotic diseases and cases of acute myocardial infarctions were measured.
中文: 本文测定了0例正常人， 例急性心肌梗塞，例冠心病无梗塞者血清SA水平。
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