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自然分离
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  natural separation
     Investigation on the Methods of Natural Separation of Aspergillus Flavus
     黄曲霉自然分离方法探讨
短句来源
     strain D-7# was used as the starting,and treated with natural separation and purification to obtain a high yielding oxytetracyclin producing Streptomyces rimosus 10#,the fermentation potency of strain 10# in shaking flask increased 12.6% as compared with that of initial strain D-7#.
     以土霉素产生菌龟裂链霉菌(Streptomycesrimosus)D-7号为出发菌株,经自然分离,纯化处理后,再经摇瓶初筛、复筛获得高效价菌株10号,其摇瓶效价提高12.6%。
短句来源
     Also through fusion breeding technology of natural separation and purification culture and protoplast, the practical strain has obtained genetic characteristics of high growing speed and stable activity for enzymic production.
     并且,借助自然分离纯化培养和原生质体融合育种技术,使实用菌株获得了生长速度较快、产酶活力稳定的遗传性状。
短句来源
     In the case of a medium and low pressure range and a constant steam output a moderate increase in operating pressure can lead to an increase in actual gravity separation height, thereby enhancing the effectiveness of natural separation.
     在中低压范围,蒸发量一定时,适当提高工作压力可以增加实际重力分离高度,从而提高自然分离效果。
短句来源
     One is feed as the mixture of vanadium titano-magnetite concentrate and ilmenite. After reduction and natural separation, pebble iron and slag containing about 50% titanium oxides can be yielded out.
     第一方案以钒钛磁铁精矿配20%钛精矿为原料,还原后渣铁自然分离,得到块铁和品位为50%左右的钛渣;
短句来源
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  natural selection
     Among them the AVM B la potency of the Ile i mutant strain 2 26 was increased 22% more than that of the parent strain XC 1 25. The strain XC 3 8, whose AVM B 1a potency was increased by 26%, was isolated by natural selection of strain XC 2 26. Subculture test indicated that the heredity character of strain XC 3 8 was stable.
     结果表明:Ilei变株发酵产生的AVMB1a效价高于自然分离株与紫外线诱变株,其中Ilei变株XC2-26的AVMB1a效价较亲株提高22%。
短句来源
     Then, (Asp. flavus)YA was mutagenized by UV, UV-LiCl and BaCOa, combined natural selection and transparent-loop in plate, and we obtained one unaflatoxigenic mutant (Asp. flavus)YA4.9 which had strong diastatic power (higher 103.46% than YA).
     并对黄曲霉菌YA分别采用紫外线及与LiCl复合诱变、碳酸钡诱发试验及自然分离方法,结合平板透明圈法,最终选育到一株糖化力高(比YA提高103.46%)、不产黄曲霉毒素的优良黄曲霉突变株YA4.9。
短句来源
     A few high yielding mutants of antibiotic 80334 have been obtainedby the complex methods of ultraviolet irradiation,natural selection,self-metabo-lite resistance and cerulenin resistance.
     采用紫外光诱变、自然分离纯化、自身耐药菌株筛选及耐浅蓝菌素菌株筛选等复合处理的方法,获得了几株高产菌株,建立了一个极为简便而有效的选育蒽环类抗生素产生菌的方法。
短句来源
     The applied study of natural selection,induction of mutation and gene engineering were discussed on Spirulina breeding.
     介绍了近几年来螺旋藻藻种选育的研究进展。 从自然分离、人工诱变、基因工程等3个方面论述它们在螺旋藻育种中的应用。
短句来源
     The results showed that the cooperation of natural selection,UV mutation and NTG treatment of strain could increase the enzyme yield and the conversion ratio of sugar to enzyme. The gulcoamylase activity was raised from 8, 500u/ml of the initial strain to 15, 000u/ml.
     实验结果表明,菌种自然分离、紫外线诱变以及NTG处理等的配合作用可显著提高产酶量和转化率,出发菌株的产酶活力从8500u/ml提高到15000u/ml。
短句来源
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  natural fission
     A comparision between the change in drug - fastness to streptomycin and geutanmicin among generations breeded by Yuanji field and ultraviolet ray treatments, and natural fission respectively is made and it has been shown that the Yuanji field has a strong effect on the induced mutation of micromonospora enchinospora.
     从棘孢小单孢菌(Micromonospora enchinospora)经元极场、紫外线处理和自然分离所获得的一批后代中,比较了它们对庆大霉素、链霉素抗药特性的变化,以一个侧面的事例,说明元极场对小单孢菌的诱变作用。
短句来源
  “自然分离”译为未确定词的双语例句
     After mutating S.actuosus S.actuosus S-19 with UV and NTG alternatively, a stable mutant S.actuosus 9-3-17 was screened out, and the total titer was three times of that the original strain.
     actuosus S-19经UV、NTG的交替诱变结合自然分离,筛选得到一株稳定的诺西肽突变株S. actuosus 9-3-17,其产量为原始菌株的3倍。
短句来源
     The fermentation of strain XC 3 8 was performed in 7m 3 fermenter, and the AVM B 1a potency and index of fermentation increased by 56% was resulted.
     该变株经自然分离获得菌株XC3-8,其AVMB1a效价比出发菌株提高50%以上,传代试验表明菌株XC3-8的形态和高产性能稳定,它在7m3发酵罐生产试验,产生AVMB1a效价与发酵指数均比出发菌株提高56%。
短句来源
     This method use the forward Euler method to conduct numerical processing for the coupled problem.
     这种方法是建立在对整个问题的一种自然分离的基础上,利用向前的Euler方法对耦合问题进行数值处理。
短句来源
     The productivity reaches 831μg/mL, which is increased by 168% in comparision with that of the parent stiain XC-LP-2, subculture test indicted that the hereditary character of high productivity of Streptomyces toxytricini XC-LP-7-69 was stable.
     以毒三素链霉菌XC-LP-2为出发菌株,经过3次紫外线诱变处理,分别筛选耐豆油、辛酸钠、亮氨酸的突变株,并结合自然分离纯化,最终获得高产突变株毒三素链霉菌XC-LP-7-69,其摇瓶效价达831μg/mL。
短句来源
     Rational screening was adopted to select mutants which could grow well on the medium with high concentration of 14 % glycerol, 0.5 % K_2HPO_4 and 1.5 % sodium sulbactain. By above methods, an over-producing strain XC-CA-7-19 was screened out.
     以XC-CA-1-26为出发菌株,经过3次紫外线诱变,分别筛选14%甘油耐受性突变株,0.5%K_2HPO_4耐受性突变株和抗终产物结构类似物舒巴坦钠突变株,并结合自然分离纯化,最终获得高产突变株XC-CA-7-19,其摇瓶发酵效价达1500μg/mL,较出发菌株生产能力提高545%。
短句来源
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  natural separation
The oscillations may be induced by natural separation unsteadiness or may be forced by boundary conditions.
      
Speaker and microphone were placed at natural separation distances and in typical sender and receiver positions.
      
A natural separation of the complete amplitude into gauge invariant parts was found and is among the main results of the paper.
      
This approach provides a quantitative description of the work efficiency of a compound system that has a natural separation between entropy-producing channels and the zero-entropy channel.
      
This conjecture is made feasible by the natural separation of the connection ωμv into "gravitational" and "electromagnetic" parts αμv and βμv, respectively, related to the metric and to the torsion.
      
更多          
  natural selection
Yet we know little about the consequence of natural selection on the two reproductive modes and factors which control the balance of the two reproductive modes.
      
In the present work, three in vivo transformed parental cell lines of different origin and 24 of their variants isolated after a short cycle of natural selection in vivo were studied.
      
Natural Selection in a Flow as a Universal Mechanism of Evolution of Prebiological Autocatalytic Systems
      
Dynamics of Natural Selection of Tumor Cells for the [H2O2CA+ PGES] Marker Phenotype during Subcutaneous Growth and Disseminatio
      
On Fisher's Fundamental Theorem of Natural Selection for space-structured populations under the conditions of strong migration
      
更多          
  natural fission
Weathering process at the natural fission reactor of Bangombé
      
The uranium deposits in the basin of Franceville (Gabon) host the only natural fission reactors known in the world.
      
Unique geological conditions favoured a natural fission reaction 2?Ga ago.
      
Trace element contents have been measured in a large variety of mineral species, as well as isotopic ratios of some REE in minerals related to natural fission reactions.
      
Isotopic study of natural fission reactors at Oklo and Bangombé, Gabon
      
更多          


Actinomycin "23-21" producing organism N-45 formed straight and flexuous spore-chains, and had smooth surfaces. Aerial mycelium was pale yellow to cream color on the inorganic medium. Substrate mycelium was yellow,orange or golden, and produced yellow to orange-red soluble pigment. Melanoid pigment was not produced. The strain N-45 was identified similar to the original strain23-21, and named Streptomyces leuteoluti-cens N-45.Pure culture of the strain of S. leuteo-luticens N-45 was obtained after four time...

Actinomycin "23-21" producing organism N-45 formed straight and flexuous spore-chains, and had smooth surfaces. Aerial mycelium was pale yellow to cream color on the inorganic medium. Substrate mycelium was yellow,orange or golden, and produced yellow to orange-red soluble pigment. Melanoid pigment was not produced. The strain N-45 was identified similar to the original strain23-21, and named Streptomyces leuteoluti-cens N-45.Pure culture of the strain of S. leuteo-luticens N-45 was obtained after four time isolations then, and through combined treatment with UV and LiCl, Actinomycin"23-21" yield could be increased to 1030 μg/ml and the major component Ⅲ of actinomycin "23-21" amounted to 85%.

放线菌素“23-21”的产生菌N-45形成直或波曲的孢子丝,孢子外壁光滑。在无机合成培养基上通常产生淡黄色至乳脂黄的气生菌丝体,基内菌丝体黄、橙黄至金黄色,并分泌黄至橙红色的可溶性色素,不产生黑色素。经鉴定该菌株与浅藤黄链霉菌“23-21”相同,而定名为浅藤黄链霉菌N-45(Streptomyces leuteoluticens N-45)。 浅藤黄链霉菌N-45经自然分离纯化后,再用紫外线和0.5%氯化锂复合处理,能显著地比原菌株提高效价三倍,同时产生放线菌素“23-21”第三组份可达到85%,稳定性好,可供生产。

Micromonospora echinospora, a gentami-cin producing strain, after successive muta-genic treatments by UV and Lithium chloride, a mutant strain NO. 29-26 was obtained. Conducting further the mutant by natural selection, we obtained another mutant strain, designated as JIM-401.

利用紫外线和氯化锂复合因子处理我国庆大霉素生产菌时得到了一株棘孢小单孢菌突变型菌株29-26,再经自然分离后获得JIM-401。该变株产生的抗生素主要组份为相模湾霉素和庆大霉素C_1a。本文报道JIM-40选育和发酵的初步研究。

A high yield mutant Aspergillus niger AN149 is obtained mutation for Aspergillus niger Co—71 using NTG. Morphological character of the mutant AN149 on the plate: Colony diameter is about 0.8—1.2cm,it has a small amount of spores, and in Medium on the back of the plate has a few light yellow pigments. As compared with strain UV—11, the activity of glucoamylase of the mutant increased about 66.7%. Fermentative techniques of liquefaction by α—amylase, feeding medium among process and control PH were investigated...

A high yield mutant Aspergillus niger AN149 is obtained mutation for Aspergillus niger Co—71 using NTG. Morphological character of the mutant AN149 on the plate: Colony diameter is about 0.8—1.2cm,it has a small amount of spores, and in Medium on the back of the plate has a few light yellow pigments. As compared with strain UV—11, the activity of glucoamylase of the mutant increased about 66.7%. Fermentative techniques of liquefaction by α—amylase, feeding medium among process and control PH were investigated in the fermentation process, The oxygen conditions in the broth were improved, and enzyme activity also increased. Glucoamvluse activity can accumulate about 9,500 units/ml(averge) by 20m~3 fermentor in a medium containing corn meal 10%, soybean cake meal 4%, and wheat bran 1%, PH4. Compared with a standard of a certain works in 1985, the enzyme activity of a single fermentor increased about 82.7%, whereas grain consume decreased about 45.2%, power consume about 45.2%, and cost about 31.4%. The benefit of technical economy is bigger than original.

经NTG诱变和自然分离获得黑曲霉变异株AN149,它在平皿上的形态特征为:菌落直径约0.8—1.2cm,少产孢子,培养基背部稍有微淡黄色素,其摇瓶酶活较原株UV—11提高66.7%。发酵采用α-淀粉酶液化,中间补料和控制PH,改善了供氧条件,提高了发酵酶活力。经20m~3发酵罐确证,在以玉米粉10%,豆饼粉4%,麸皮1%的培养基中,糖化酶平均产酶活力为9500u/ml,这与1985年某工厂生产相比较,单罐产量提高82.7%,粮耗下降45.2%,电耗下降45.2%,成本下降31.4%,具有较好的技术经济效果。

 
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