草酰乙酸的

The results showed that molecular weight of malate dehydrogenase was 69 kDa which included two subunits with the molecular weight was about 34 kDa. The optimal pH, temperature and Km were 8.0, 50℃ and 84. 6μmol/L (oxaloacetic acid, pH 8.3), respectively.

结果表明：苹果酸脱氮酶的相对分子质量约为69000，含有2个亚基，每个亚基的相对分子质量约为34000；该酶的最适作用pH为8.0，最适作用温度为50℃；K值为84.6μmol/L（草酰乙酸，pH8.3）。

Surprisingly, the amount of oxygen consumed was about seven times more than the amount necessary for complete oxidation (to CO2 and H2O) of the added oxaloacetate or malate.

令人惊讶的是，加入草酰乙酸或苹果酸，耗氧量是完全氧化为CO2和H2O所需的氧的7倍多。

In the early 1930s, Albert Szent-Gyorgyi reported the interesting observation that the addition of small amounts of oxaloacetate or malate to suspensions of minced pigeon- breast muscle stimulated the oxygen consumption of the preparation.

在30年代早期，Albert Szent-Gyorgyi报告了一个有趣的发现，小剂量的草酰乙酸或苹果酸的加入对切碎的鸽子胸肌的悬浮液的氧消耗有促进作用。

Firstly, 3-ethylthiobutanal was prepared from crotonaldehyde reacting with ethanehiol in triethylamine with high yield. Secondly, methyl acetoacetate was converted to 6-ethylthiohept-3-en-2-one by three steps via hydrolysis, condensation with 3-ethyltio-butanal and dehydration, then 6-ethylthiohept-3-en-2-one was cycloco ndensed with dimethyl malonate by Michael addition and Claisen condensation, followed by saponification and decarboxylation to give the intermediate of 5-(2-ethylthiopropyl)-cyclohexane-1,3-dione.

首先，以巴豆醛与乙硫醇为原料，在三乙胺的催化作用下高收率制得3-乙硫基丁醛；然后从乙酰乙酸甲酯出发，通过碱水解、与3-乙硫基丁醛缩合、脱水三步反应合成6-乙硫基-3-烯-2-庚酮，接着6-乙硫基-3-烯-2-庚酮与丙二酸二甲酯通过Michael加成和Claisen缩合成环，再通过皂化和脱羧反应生成中间体5-[2-丙基]-1，3-环己二酮；再与丙酸酐反应丙酰化，最后与0-3-氯-2-丙烯基羟胺肟化，得到目标化合物烯草酮。

In these chloroplasts carbon dioxide combines with phosphoenolpyruvate to form oxaloacetic acid, which is transported to the bundle sheath cells, where the carbon dioxide is released, then fixed by the enzyme ribulose bisphosphate carboxylase to form glycerate 3-phosphate, the first step in the Calvin cycle.

在叶肉细胞的叶绿体中二氧化碳与磷酸烯醇丙酮酸结合形成草酰乙酸，后被运到邻近的维管束鞘细胞，在那里二氧化碳被释放，后被核酮糖二磷酸羧化酶固定形成3－磷酸甘油酸，这是卡尔文的循环第一步。

To improve the yield of an Amide-type Tripodal Ligand and investigate its coordination with rare earth ion under mild condition,a series of Amide-type Tripodal Ligands(L1—L4) have been prepared by the reactions of nitrilotriacetic acid and oxalyl chloride with four kinds of amides,respectively.

为了提高酰胺型三脚架型配体的产率，进一步研究其与稀土离子的配位形式及配合物的荧光性能，以氨三乙酸为母体，草酰氯为氯化试剂，与4种胺在较温和的条件下合成了具有三脚架型结构的配体(L1—L4)，并考察了实验条件、反应温度、反应体系溶剂、缚酸剂、反应时间及催化剂对反应产率的影响。

Kinetic spectrophotometric method for the determinationof trace nitrilotriacetic acid;2. To improve the yield of an Amide-type Tripodal Ligand and investigate its coordination with rare earth ion under mild condition,a series of Amide-type Tripodal Ligands(L1—L4) have been prepared by the reactions of nitrilotriacetic acid and oxalyl chloride with four kinds of amides,respectively.

为了提高酰胺型三脚架型配体的产率，进一步研究其与稀土离子的配位形式及配合物的荧光性能，以氨三乙酸为母体，草酰氯为氯化试剂，与4种胺在较温和的条件下合成了具有三脚架型结构的配体(L1—L4)，并考察了实验条件、反应温度、反应体系溶剂、缚酸剂、反应时间及催化剂对反应产率的影响。

RESULTS: 12 compounds were isolated and identified as aurantiamide acetate (1), aurantiamide benzoate (2), physcion (3), scopoletin (4), vanillin (5), coniferyl aldehyde (6), syringaldehyde (7), syringic acid (8), luteolin (9), apigenin (10), azelaic acid (11), dotriacontanic acid (12), respectively.

结果：从羊耳菊全草的氯仿和乙酸乙酯部分共分离得到12个化合物，分别鉴定为橙黄胡椒酰胺乙酸酯(1)，橙黄胡椒酰胺苯甲酸酯(2)，大黄素甲醚(3)，东莨菪亭(4)，香草醛(5)，松柏醛(6)，丁香醛(7)，丁香酸(8)，木犀草素(9)，芹菜素(10)，壬二酸(11)，三十二烷酸(12)。

Aspartic acid An AMINO ACID formed by transamination, in which the amino group of dlutamic acid is transferred to oxaloacetic acid.

天冬氨酸：由转氨基作用形成的一种氨基酸，谷氨酸的氨基基团被转移到草酰乙酸中。

The extracts from evening primrose flower could significantly enhance the cellular immune function in immunosuppressed mice. Effects of ethylacetate extract was better than those of water extract.

月见草花乙酸乙酯提取物和水提取物均可明显增强环磷酰胺免疫抑制小鼠的细胞免疫功能，其中乙酸乙酯提取物的作用优于水提取物。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。