共查询到20条相似文献，搜索用时 62 毫秒
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设计了分离酵母菌和测定其发酵力(乙醇度)及甲醇含量的方法,初步选育出发酵力较好而甲醇含量较低可作为生产用的乙醇发酵酵母菌菌株. 相似文献
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目的：研究酶法降解玉米芯的最佳工艺和酵母菌发酵的最佳工艺.方法：采用纤维素酶对玉米芯进行酶解,采用酵母菌对酶解液进行发酵.结果：酶解条件：纤维素酶0.6mL,pH值为5～6,温度40℃,Tween-80添加量为1%,微量元素的添加量为0.5%,酶解48h后还原糖浓度达到最大值;发酵条件：活化后酵母菌的接种量40mL,发酵温度30℃,发酵36h后,乙醇产量的最高.结论：在较佳的酶解和较佳的发酵条件下,可显著提高酶解率和发酵率. 相似文献
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目的:研究优化黑曲霉、乳酸菌、枯草芽孢杆菌及酵母菌等4种混菌混合发酵玉米豆粕型饲料的最佳发酵菌种比例组合.方法:以黑曲霉、乳酸菌、枯草芽孢杆菌及酵母菌为4个因素,每个因素设定3个水平,按照L9(34)正交试验表设计9组不同的菌种比例组合,总接种量按4％,发酵初始水分设定为36％,30℃条件下进行固态发酵,分别发酵48、72、96 h后测定样品pH值、乳酸含量及干物质回收率(DMR),优化其最佳发酵组合.结果:相同发酵时间内,黑曲霉、乳酸菌、枯草芽孢杆菌、酵母菌之比为3:3:2:1时,样品pH值最低,发酵速度最快;相同发酵时间内,黑曲霉、乳酸菌、枯草芽孢杆菌、酵母菌比例为3:3:2:1时,乳酸含量显著高于其他各菌种比例组合(P<0.05);发酵时间为72 h时,干物质回收率各组间无显著性差异(P>0.05),干物质损失在4.60％.结论:本试验条件下,黑曲霉、乳酸菌、枯草芽孢杆菌、酵母菌之比为3:3:2:1时,发酵效果最好. 相似文献
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酵母菌在发酵工业中的应用 总被引：2，自引：0，他引：2
周岩 《河南职业技术师范学院学报》1997,25(3):59-64
酵母菌在发酵工业中有着广泛的应用。本文着重阐述了酵母菌发酵的传统产品以及近年来国内外开发利用酵母菌发酵生产的新型产品。 相似文献
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李红 《中山大学学报论丛》2007,27(11):370-373
该文利用RT-PCR方法从里氏木霉mRNA获得EGII cDNA,插入酵母表达载体pPIC9K,整合到毕赤酵母染色体上,获得重组酵母菌株GS115-EGII,通过高密度发酵条件下甲醇诱导,使EGII基因在毕赤酵母中得到了高效表达。 相似文献
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1961年国际酶学委员会(Enzyme Committee,EC)根据酶所催化的反应类型和机理,把酶分成6大类:1氧化还原酶类主要是催化氢的转移或电子传递的氧化还原反应。在酶家族中数量很多。它又分为两类:1.1脱氢酶类催化直接从底物上脱氢的反应。反应通式:AH2+B A+BH2。其中AH2是氢的供体,B是氢的受体。在酵母菌发酵生成酒精的反应中,有一种醇脱氢酶,它作用于乙醇,使乙醇转变成乙醛。这个反应是可逆的,这种酶也能使乙醛转变成乙醇。发酵时醇脱氢酶就催化乙醛加氢转变成乙醇的。乳酸脱氢酶也属于此类酶,它能催化乳酸脱氢,变成丙酮酸,是参与糖酵解的… 相似文献
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温度对浓香型白酒发酵生酸的影响 总被引：1，自引：0，他引：1
通过对控温发酵与传统发酵方法进行对照试验, 检测不同发酵期糟醅中酵母菌、兼性厌氧细菌的数量和乳酸、已酸的生成量. 发现在发酵初期控制
较低温度, 可以使酵母菌成为优势菌群, 抑制乳酸生成. 在发酵中后期控制较低温度, 可以使兼性厌氧细菌的数量出现两个峰值, 促进已酸的生成. 初步
解析了发酵温度对酵母菌、兼性厌氧细菌的影响, 以及酵母菌、兼性厌氧细菌的消长与乳酸、已酸的生成量的关系. 表明用换热方法实现对浓香型白酒发
酵温度进行控制可以降低乳酸生成量, 提高已酸生成量. 相似文献
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对3种共25株酵母菌进行了富铁能力的筛选,经过抗性筛选和摇瓶发酵培养筛选到一株生物量及细胞铁含量均较高的酵母菌株R4-5,该菌株能以甘蔗糖蜜作为唯一碳源发酵培养富铁酵母,在培养条件下,生物量为8.78 g/L发酵液,细胞铁含量为5.45 mg/g干菌体,总铁含量达47.851 mg/L发酵液。 相似文献
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利用流式细胞术对毕赤酵母发酵过程中胞内活性氧（ROS）的变化进行定量检测和分析,建立发酵过程单位细胞胞内ROS的相对含量以及单位体积细胞胞内ROS相对含量的计算方法,分析ROS积累对毕赤酵母细胞活力的影响,研究结果表明：在甲醇流加阶段,单位细胞的DCF（2′,7′-二氯荧光黄）染色平均荧光强度随着时间的增加而增加,即单位细胞胞内ROS的含量在甲醇流加阶段一直增加,细胞内产生持续的氧化压力,导致部分细胞死亡;单位体积酵母细胞的胞内ROS含量在甲醇流加阶段保持在一个相对稳定的范围。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities. 相似文献
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RUZBEHANI Mohsen 《重庆大学学报(英文版)》2004,3(1):20-25
1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec… 相似文献
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唐芳 《读与写:教育教学刊》2008,5(6)
During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context. 相似文献