固氮菌

H2-uptake phenomenon of the bacterial ferritin is still found in an analogy system of micro-oxygen environment of entire cell Azotobacter vinelandii in vitro, which indicates that the H2-uptake reaction can be carried out by the ferritin within the cell.

此外，细菌铁蛋白在体外模拟棕色固氮菌整体细胞内的微量氧环境体系中仍有氢还原现象，因而推测细菌铁蛋白在该菌体内也能进行吸氢反应。

In order to select high nitrogen-fixing azotobacter strains, nitrogenase activity of 13 strains separated in the rhizosphere in Gansu non-leguminous crop fields were measured by acetylene reduction method. Also the fertilization effect of the strains on spring wheat was investigated via pot experiment.

为挑选具有高固氮能力的自生固氮菌菌株，用乙炔还原法对甘肃省春小麦和玉米等非豆科作物根际土壤中分离所得的13株菌进行固氮酶活性测定，并通过盆栽试验对其进行春小麦肥效试验。

In 1975 Dbereiner experimentally found the associative symbiotic nitrogen-fixation bacteria associated with graminaceous plant and put forward the concept of rhizosphere associated NF.

1975年，Dbereiner实验发现与禾本科植物联合共生的固氮菌并提出根际联合固氮的概念。

It has been 40 years since Dobereiner and Ruschel isolated the nitrogen-fixing bacteria from the rhizosphere of sugarcance plants and demonstrated the potential of diazotrophs to associate with graminaceous plants.

本研究分离、筛选得到一株固氮酶活性高且稳定，生长势强的联合固氮菌株，并对其分类地位、形态及生理特征、对环境的适应性及其对植物的促生效果和作用机理作了系统研究，得结果如下。

The results showed that PSB and organic fertilizer could promote the growth of actinomyces, heterotroph bacteria, azotobbacter, ammonifying bacteria and nitrobacteria significantly, and restrain the growth of denitrifying bacteria in the soils.

结果表明，光合细菌和有机肥显著促进土壤中放线菌、异养细菌、固氮菌、氨化细菌和硝化细菌的生长，而抑制反硝化细菌数量。

Within the nodules the bacteria convert free nitrogen to nitrates, which the host plant uses for its development.

根瘤内的固氮菌将游离氮转化为硝酸盐，被宿主植物在发育中利用。

For further interpretation and determination of the cluster numbers of each UPGMA dendrograms, minimum distance statistics, was therefore applied. The results showed that the application of butachlor altered the composition of diazotrophic and eubacterial communities without recovery to the inceptive state after 100 days of rice cultivation.

为更进一步演绎集群分析结果，采用最小距离法（Minimum Distance，简称MD）决定UPGMA 图谱的分群数目，所得结果显示，丁基拉草的施用可影响游离固氮菌及真细菌菌族群之菌相组成，且经100天的水稻种植期后，未能恢复成原有的菌相状态。

In the condition of the above mentioned, field experiments were done. The results showed that:The process was the inoculation proportion of Candida tropicalis, Pseudo monas and Candida utilis as 1:2:2, inoculation 2%, 2.0% urea added in Jowar juice, pH 6.0, fermenting 72h at 30℃. The content of fulvic acid could reach more than 20%.5% mixture of Azotobacter chooroccum, Phospho bacteria and Silicate bacteria (2:1:2) were added to the product. The total number of bacteria reached 10 /ml.

研究结果表明：用热带假丝酵母、假单胞杆菌和产朊假丝酵母组合进行液体发酵，接种比例1∶2∶2，接种量2%，在甜高粱秸秆汁中加入2.0%的尿素，pH值为6.0，发酵温度为30℃，发酵72h，发酵产物中生化黄腐酸含量可达20%以上；将圆褐固氮菌、磷细菌、钾细菌以2∶1∶2的比例，按5%加入到发酵产物中，三种细菌总的活菌数可达10~8个/ml；生化黄腐酸复合生物液肥对各种作物的产量均有不同程度的提高，经济效益显著。

A study on the optimal fermentation process of producing fluid fertility containing biotechnology fulvic acid from Jowar straws juice;2. The optimum mixture of biotechnology fulvic acid , Azotobacter chooroccum, Phospho bacteria and Silicate bacteria were stu.

本文以甜高粱秸秆汁为原料，通过单菌及混合菌种发酵实验确定了发酵的最佳菌种组合；利用微生物混合发酵确定了发酵菌种的接种比例、接种量、最佳氮源及其添加量；用L_9(3)~3正交设计的方法，确定了发酵的最佳pH值、发酵时间和发酵温度；研究了生化黄腐酸液体肥料和圆褐固氮菌、钾细菌、磷细菌的复配工艺，并在作物上进行了田间试验。

For example, the growth of N-fixating bacterium and Mucor take base to the environment while Rhizopus take acid to it.

如固氮菌和毛霉的生长易使环境转向碱性，根霉使环境变酸。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失