共查询到20条相似文献，搜索用时 947 毫秒
1.
纯化了黑曲霉Aspergillus niger FJL0801糖化酶,并对其酶学性质进行研究.粗酶液经纯化后,较粗酶液纯化了38.42倍,酶活回收率达到17.45%.酶最适作用温度为60℃;最适反应pH值为4.5;在60℃下,保温2 h后,相对酶活42%±2.8%.在pH4.5,60℃下,作用时间在60 min以内,其酶活保存89%±2.56%;其酶学性质符合淀粉糖化工业化过程中对酶的要求,该酶比较适合应用于淀粉糖化工业. 相似文献
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从土壤中分离筛选到一株降解生淀粉能力较强的菌株,通过固体发酵其生淀粉糖化酶活为2237U/g（按U/g麦麸计）,RDA值为15.25%。根据形态学特性初步鉴定该菌属于拟青霉属（Paecilomyces sp.）。其最适生长温度为30℃,最适生长起始pH5。其粗酶液24h水解生玉米淀粉的水解率为86.88%;对不同来源的生淀粉的水解能力不同,为玉米粉〉面粉〉米粉〉木薯粉〉甘薯淀粉;其最适作用pH为4,最适作用温度为70℃。 相似文献
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通过单因素试验和均匀试验设计,确定了米曲霉R519产木聚糖酶.结果表明：米曲霉R519产木聚糖酶最适反应条件是温度为60℃,pH值为4.5,酶液用量与底物用量比值为1/9.酶学性质Co^2＋和Fe^2＋对酶具有强烈的激活作用,Ca^2＋和Zn^2＋具有强烈的抑制作用. 相似文献
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海洋适冷菌产低温纤维素酶的条件优化 总被引：1，自引：0，他引：1
本文对一株分离自黄海深海海底的产纤维素酶海洋适冷茵进行了产酶条件研究。结果显示。在接近自然海水盐度、温度20℃，自然pH条件下，茵体生长和产酶较好。所产纤维素酶为诱导酶，主要作用底物为CMC-Na和微晶纤维素。以1％球磨Avicel 1％蔗糖构成的复合碳源产酶活力最高；最适氮源为1％蛋白胨 1％酵母膏。 相似文献
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《绵阳师范学院学报》2016,(5):65-71
优化纤维素降解菌株CY10产酶条件,为该菌株在纤维素的生物降解方面提供实验依据.通过单因素试验对CY10菌株产酶条件进行优化,依据纤维素酶(CMCase)和滤纸糖化酶(FPase)活力大小确定最适培养时间、初始p H、碳源、氮源、温度、接种量及装液量等.结果表明:菌株CY10产酶的最适初始p H为6.5,碳源为麦麸(2.0%),氮源为酵母粉(0.5%),在30℃培养42 h;该菌株所产CMC酶和滤纸酶的酶活性最适温度为45℃,最适p H为6.5.在此条件下,CY10菌株的CMCase和FPase活力分别达到21.26 U/m L和23.57 U/m L.为此,菌株CY10在纤维素的生物降解方面具有较好的应用前景. 相似文献
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濮智颖 《陕西教育学院学报》2008,24(2):101-105
从煤矿酸性废水中分离到一株产木聚糖酶青霉,通过酸性液体培养研究了菌体生长对pH的响应及木聚糖酶的产生特征,并测定了木聚糖酶的部分应用性质。结果表明：实验菌株嗜酸,菌丝生长最适pH为2．0,孢子萌发生长适宜pH为3．0—4．0;木聚糖诱导菌体在生长稳定期大量产生木聚糖酶,蛋白胨是菌体产酶的适宜氮源;菌株所产木聚糖酶属于酸性木聚糖酶,反应最适pH3．5、最适温度50℃-55℃,在最适反应条件下保温60min,残余酶活仍接近70％,适用于较强酸性的高温加工环境。 相似文献
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本文研究了青霉菌（Penicilliumsp．）P1固态发酵培养的产酶过程,发酵4天产木聚精酶活力最高,固体曲最适浸提比为1：7（w／v）,通过65％饱和度的硫酸按盐析,获得的木聚糖酶效果较好。40℃烘干酶粉活力为1305．6IU／g,得率为69．5％。酶反应最适pH4．6,最适温度50℃。酶与底物半纤维素作用的亲合性大小顺序为：麸皮＞稻草＞蔗粉＞玉米芯。 相似文献
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真菌木聚糖酶生产和应用研究所 总被引：1，自引：0，他引：1
黑曲霉（ASPERGILLUSNICER）菌株固态发酵的产酶过程研究表明,培养3天产木聚糖酶活力达最高,SephadexG-100,DEAE-SephadexA-50。经分离纯化后获得三个组分,X1X2,X3,它们的最适反应温度和pH分别为40,50,50℃和3.5,4.5,5.0.木聚糖酶相关性质和应用也进行了研究。 相似文献
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朱德艳 《荆门职业技术学院学报》2009,24(5):29-32
介绍了一种从土壤中选育一株产环糊精葡萄糖基转移酶（CGTase）的芽孢杆菌的方法。经筛选,最终找到一株高产CGTase的菌株SC3—2,鉴定该菌株为嗜碱性枯草芽孢杆菌。通过对其产酶条件的探索,结果表明：以玉米淀粉为碳源,以黄豆粉为氮源,在pH值为6．5,30℃的条件下培养36h,菌株所产CG-Tase的酶活力可迭5046U／mL。 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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Rajesh Kanoi 《海外英语》2007,(1):52
Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer. 相似文献
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正A One day a pig went to the stable(马棚)to see his good friend,an oldhorse,and was going to stay there forthenight.Night came and it was time forsleep.The pig went into the straw heap(稻草堆)and lay comfortably.A longtime passed,but the horse was stillstanding there and did not move.Thepig asked the horse why he did not go tosleep."Standing like this is the begin-ning ofsleeping,"answered the horse. 相似文献
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《今日中学生》2014,(9)
正1.Any fool can count the seeds in an apple.Only God can count all the apples in one seed.2.Happy families are all alike;every unhappy family is unhappy in its own way.3.Memories are the key not to the past,but to the future.4.Sometimes in the dark you see what you want to see.5.There is a great difference between 相似文献
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《重庆大学学报(英文版)》2014,(2)
正Scope and Policy The Journal of Chongqing University-English Edition(JCQU-E)is a peerreviewed journal publishing research articles in multiple disciplines of science and technology,covering civil and environmental engineering,chemical engineering,biotechnology,mechanical and electrical engineering,computer and data processing,mining,metallurgy,materials science,and interdisciplines thereof. 相似文献