以下为句子列表：
英文: An enzymatic synthesis and composition of oligomers and co-oligomers comprised of .alpha.-hydroxy carboxylic acids and .alpha.-amino acids or peptides is disclosed.
中文: 一种低聚体和由α-羟基羧酸和α-氨基酸或肽组成的副低聚体的酶合成成分。
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英文: They were used as efficient Lewis acid catalysts for esterification reactions of carboxylic acids with alcohols to afford corresponding saturated esters with 87%~98% yields and unsaturated and tertiary ones with 90%~94% and 54%~68% yields, respectively.
中文: 结果表明，该有机锡化合物是合成酯的优良催化剂，产品收率高，饱和一元羧酸酯的收率为87%~98%，对不饱和羧酸酯和空间位阻大的叔醇酯也能得到较满意的收率，分别为90%~94%和54%~68%。
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英文: Determination of Low Molecular Carboxylic Acids in Portulaca Oleracea L. by Ion Exclusion Chromatography
中文: 离子排斥色谱法测定马齿苋中低分子羧酸
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英文: STUDIES ON PYRIDONECARBOXYLIC ACIDS AS ANTIBACTERIAL AGENTS XII. SYNTHESIS AND ANTIBACTERIAL ACTIVITY OF 6 CHLORO 1 CYCLOPROPYL 7 (1 PIPERAZINYL) 1,4 DIHYDRO 4 OXO QUINOLINE 3 CARBOXYLIC ACID AND ANALOGUES
中文: 吡酮酸类抗菌药物的研究 XII.6-氯-1-环丙基-7-(1-哌嗪基)-1,4-二氢-4-氧代喹啉-3-羧酸及其类似物的合成与抗菌作用
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