以下为句子列表：
英文: Abstract: Methanesulfonic acid method was used to prepare five acylated chitins.Except heptanoyl chitin, four of them,i.e.acetyl chitin,propionyl chitin,butyryl chitin and hexanoyl chitin,had high degree of substitution(from 1.5 to 2.0)and exhibited lyotr
中文: 文摘:四种羧酰化甲壳素即乙酰化、丙酰化、丁酰化和己酰化甲壳素在二氯乙酸溶液中均呈现胆甾型溶致液晶相.临界浓度随侧基长度增加而略有增加，衍生物的临界浓度明显都比原甲壳素高许多，这些规律都可以用链刚性的变化来解释.四种羧酰化甲壳素在剪切时均能形成条带织构，而且能形成条带织构的最低浓度有明显差别，随侧基长度增加而提高，进一步表明侧基较长，液晶性减少.
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英文: Because chitin has a high degree of crystallinity, it can only be dissolved in expensive organic solvents.
中文: 摘要由于天然甲壳素结晶度高，在湿法纺丝过程中溶解甲壳时需要使用价格较高的有机溶剂。
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英文: By acetylating the chitosan fibers, chitin fibers can be made through a batch process.
中文: 在甲壳胺纤维上加上乙酰基后要以得到再生甲壳素纤维。
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英文: Chitin A nitrogen-containing polysaccharide found in the cell walls of most fungi and in some animals.
中文: 几丁质：在大多数真菌和一些动物的细胞壁中发现的含氮的多糖。
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英文: Chitin has a tight connection with human life.
中文: 甲壳素与人类的生命有着密切的关系。
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