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金针菇菌丝体深层培养工艺研究 总被引:3,自引:1,他引:2
在1.8L气升式发酵反应器中,研究了金针菇菌丝体深层培养工艺条件及其特性。结果表明:金针菇菌丝体深层培养可采用玉米、黄豆和糖蜜等廉价原料作主要碳氮源;最适需氧量为1.0—2.0×10-7mol O2/ml·min·atm,培养24—72h内,菌丝球生长遵循立方根规律·即x1/3,=0.786+0.027t。在最佳发酵条件下,摇瓶培养4天,茵丝干重达24.4mg/ml在反应器培养4天,菌丝干重为25.7mg/ml。 相似文献
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金针菇在淀粉废水中发酵的营养条件研究 总被引:1,自引:0,他引:1
用摇瓶试验对金针菇菌丝体在淀粉废水中培养的营养条件进行了研究。结果表明,利用淀粉废水进行金针菇液体发酵的最适营养条件为:经液化处理的淀粉废水,加KH2PO40.25 g/100 mL,MgSO4·7H2O0.05g/100mL,VB1150μg/L,VB250μg/L,pH5.40。测定了该营养条件下菌体的生长曲线及发酵过程中培养基残糖的变化。发酵周期为7d,发酵终点生物量达2.08 g/100 mL,COD去除率为70.8%。 相似文献
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尖镰孢胞外青霉素V酰化酶的产生 总被引:1,自引:0,他引:1
由腐殖土中分离出一株产胞外青霉素V酰化酶的尖镰孢(Fusariumoxysporum),编号FP941。研究了该菌在液体培养基中产胞外青霉素V酰化酶的条件。在以10%麦麸为碳源的培养基中,添加氮源能促进酶的形成。无机氮源优于有机氮源。(NH4)2HPO4的促进效果最佳,草酸铵次之,用量均为1%。为提高产酶量,培养基中添加诱导物是必要的、苯氧乙酸的诱导效果最佳,用量为0.1%,其次是青霉素V,用量为0.3%。最适培养条件为:培养 相似文献
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本文对4种羊肚菌在固体发酵条件下的菌丝生物量和降解淀粉作用进行了研究,结果表明:羊肚菌(Morchella esculenta)、尖顶羊肚菌(M conica)、黑脉羊肚菌(M angusticeps)和皱柄羊肚菌(M. crassipes)在玉米粉培养基或马铃薯粉培养基上进行固体发酵时,菌丝生物量之间无显著差异;但a-淀粉酶活力、淀粉降解率差异显著。4种羊肚菌中,尖顶羊肚菌的降解淀粉能力最强。在培养基中添加Ca2+和氮源以及将发酵时间从15天延长到25天均能显著提高羊肚菌的菌丝生物量、a-淀粉酶活力和淀粉降解率。在添加10%黄豆粉、0.1%Ca(Cl)225℃发酵25天的玉米粉和马铃薯粉的发酵产物中,尖顶羊肚菌对玉米淀粉的降解率可达到74.2%,对马铃薯淀粉的降解率可达到79.8%。 相似文献
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植物细胞离析酶的制备和应用 总被引:2,自引:0,他引:2
用 Aspergillus sp.A-19菌经固体发酵研制成一种新的植物细胞离析酶(SeparatasezA—P)。其离析单细胞的酶活力平均为70 767u/g,有效作用的pH在3.0—7.0,温度为20—45℃。发酵培养基配方是麸皮:桔皮粉:(NH4)2SO4(w/w)为100:100:O.63,料水比为1 :2.0,培养适宜条件为25℃、60小时。 相似文献
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H.-R. GREGORIUS 《Biological journal of the Linnean Society. Linnean Society of London》1984,23(2-3):157-165
For a plant selection model with frequency-independent viabilities, fertilities and selfing rates, it is shown that apart from global fixation, for certain parameter combinations a protected polymorphism and facultative fixation (either allele may become fixed according to initial frequencies) may both occur. Facultative fixation requires different selling rates for the dominant and recessive type. Protection of the polymorphism requires resource allocation for male and female function. In this connection the problem of purely genetically caused population extinction is discussed.
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment. 相似文献
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment. 相似文献
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In this article, we systematically review Dr. Wu Lien-Teh's academic achievements and outstanding contributions in the prevention and control of the plague epidemic in northeast China and introduce the development of the earliest public health epidemic prevention system in China in order to commemorate the 140th anniversary of Dr. Wu Lien-Teh's birth. We hope that this article will provide insights into the effective prevention and control of emerging infectious diseases as well as the current worldwide pandemic of COVID-19, facilitating the improvement and development of public health systems in China and around the globe. 相似文献
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