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The result was shown as follows:compared with the good quality beer,the diacetyl,aldehyde,islobutyl alcohol,isoamyl alcohol and total acid were higher,however,propyl alcohol and ethyl butyrate were lower

研究中还发现污染细菌后的发酵过程中的pH下降迅速，降糖加快，最终得到的啤酒中双乙酰、乙醛、异戊醇、异丁醇和总酸偏高，而正丙醇、丁酸乙酯含量偏低。

Some research and analysis on the reaction of 2,4-difluoronitrobenzene and nucleophilic reagent alcohol sodium (methyl alcohol ,ethyl alcohol, propyl alcohol, n-butyl alcohol, t-butyl alcohol, et hl) and the reaction choice of opposite -F in different solvent and conditions have done in this paper.

论文以2，4-二氟硝基苯为主要原料，研究了其与亲核试剂醇钠(甲醇、乙醇、丙醇、正丁醇、叔丁醇等)在不同溶剂中的反应情况，讨论了在几种代表性的溶剂——醇、四氢呋喃、苯、N，N-二甲基甲酰胺中亲核取代反应的情况，研究了温度、反应时间、亲核试剂、溶剂等条件对亲核取代反应的影响。

These peaks correspond to side-chain cleavage of the ethyl and propyl groups respectively.

这些峰分别相当于乙基和丙基的侧链开裂。

Methyl, Propyl, Butyl and Ethyl Paraben — Used as inhibitors of microbial growth and to extend shelf life of products.

甲基、丙酯、丁酯和尼泊金乙酯——它们的作用是微生物生长抑制剂，并可延长产品的保质期。

The effect of various polar fractions from Psoralea corylifolia L. ethanol extract on cell proliferation and differentiation were further examined and its ethyl acetate fraction were found to be active fraction.

对补骨脂不同极性萃取物进一步进行成骨样细胞增殖和分化活性测试，发现补骨脂乙酸乙酯萃取物为补骨脂中的主要活性部分。

Compared with OVX, the ethyl acetate fraction from Psoralea corylifolia L. significantly increased bone mineral density and bone calcium content of rats.

结果表明，给予补骨脂乙酸乙酯萃取物的大鼠与模型组大鼠相比，骨密度、骨钙含量显著增加。

Extracts the Pyracantha fortuneana red pigment with soaking the acidic edible 70% ethyl alcohol,and conducts the research to this pigment stability.

因此，探求并开发天然食用色素资源是食品科学领域极有吸引的研究方向之一，具有重要的经济价值和社会意义。

Nine new compounds were characterized, and they were: opuntioside Ⅰ(11), 4-ethoxyl-6-hydroxymethyl-α-pyrone (14),--ester (22), 1-butoxyl--malate (24), ethyl α-L-rhamnopyranoside (26), opuntioside Ⅱ(34), kaempferol 7-O-β-D-glucopyranosyl (1→4)-β-D-glucopyranoside (46), methyl α-D-glucopyranoside-6-(methyl 4-malate)-ester (47), and opuntioside Ⅲ(48). Opuntioside Ⅰ,Ⅱ,Ⅲ and 4-ethoxyl-6-hydroxymethyl-α-pyrone belong to the skelecton of α-pyrone.

新化合物分别是：仙人掌苷Ⅰ（11），4-乙氧基-6-羟甲基-α-吡喃酮（14），琥珀酸乙酯--酯（22），L--苹果酸-1-丁酯（24），乙基α-L-吡喃鼠李糖苷（26），仙人掌苷Ⅱ（34），山奈酚7-O-β-D-吡喃葡萄糖基（1→4）-β-D-吡喃葡萄糖苷（46），α-D-吡喃葡萄糖甲苷-6-（苹果酸-4-甲酯）-酯（47），仙人掌苷Ⅲ（48），其中仙人掌苷Ⅰ、Ⅱ、Ⅲ及4-乙氧基-6-羟甲基-α-吡喃酮均为α-吡喃酮骨架类型的新化合物。

In this paper, the innovative improvement of the cyclization and chlorination of quinoxaline was: 1. DHQX was prepared via reactingο-phenylenediamine with ethyl- oxalate in hydrochloric acid, the mixture was stired at 75-80℃for 2h.

本文对喹喔啉环合和氯代反应作了一些革新性的改进： 1、在环合合成DHQX时：以盐酸溶液为介质，邻苯二胺和草酸二乙酯在75-80℃进行环合反应约2h，即可得产物。

Benzyloxy benzoyldimethylsulfoxide was prepared by the reaction of ethyl 4-benzyloxybenzoate and dimethyl sulfoxide in the presence of sodium hydride, followed by Pummerer reaction with concentrated hydrochloric acid to afford eo-hydroxy-co-thio-methyl-(4/-benzyloxy) acetophenone, which reacted with urea, thiosemicarbazide, semicarbazide hydrochloride and o-phenylenediamine to give imidazolidine-2,4-dione, l,2,4-triazine-3- one and quinoxaline derivatives, respectively.

本文用4-苄氧基苯甲酸乙酯和二甲亚砜为原料，在氢化钠存在下反应，合成了(4′-苄氧基)-苯甲酰基-二甲亚砜。研究了该亚砜在浓盐酸的存在下发生的Pummerer重排反应，用重排产物ω-羟基-ω-甲硫基-(4′-苄氧基)-苯乙酮分别与尿素、氨基脲、氨基硫脲和邻苯二胺反应合成了2，4-咪唑啉-二酮、1，2，4-三嗪-3-酮、喹喔啉等含氮杂环化合物。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。