共查询到19条相似文献,搜索用时 109 毫秒
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硅酸盐细菌的诱变选育研究 总被引:1,自引:0,他引:1
利用紫外线和LiCl复合诱变方法处理解磷硅酸盐细菌,研究诱变出的菌株的溶磷能力的大小.将ACCC10011磷细菌培养,采用UV+LiCl复合诱变,菌落长出后计数,求各处理组的致死率,在致死率达75%以上的诱变平板上挑取菌落进行培养,最终测定其解磷能力.在经0.7%LiC+90sUV诱变条件处理的培养平板上挑取的两种菌株在分解无机磷和有机磷的能力方面具都有比原始菌株较大提高.0.7%LiC+90sUV诱变处理剂量为本实验最佳设计条件. 相似文献
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为实现电解锰渣中硅的资源化利用,采用摇瓶浸出研究硅酸盐细菌(胶质芽孢杆菌,Bacillus mucilaginosus,BMN)对电解锰渣中有效硅的浸出效果,探究培养基、电解锰渣的粒径大小、体系的pH值、培养时间、培养温度、摇床转速等六个因素对硅浸出效果的影响.研究表明:采用阿什比基质矿物盐培养基,调节矿浆浓度至10%,培养基中细菌初始浓度为107个/mL,电解锰废渣的粒径为80目、体系pH值为7.0~7.2、30℃时以180 r·min-1的转速培养20 d后,硅酸盐细菌的浸出液中SiO2质量浓度可达93.88 mg/L.表明硅酸盐细菌对电解锰渣有一定的脱硅能力,为电解锰渣的资源化利用提供可能. 相似文献
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利用硅酸盐细菌(GY03)制备煤矸石肥料的研究 总被引:3,自引:0,他引:3
针对贵州存在大量废弃的煤矸石造成了严重的环境污染,研究了利用硅酸盐细菌(GY03)作用于煤矸石将其中难溶于水的磷、钾转化为能被植物吸收的有效磷、速效钾来制备煤矸石肥料,并研究了煤矸石粒径、体系pH、培养时间、培养温度及体系湿度对制备煤矸石肥料的影响。研究发现:当煤矸石的粒径在160目、体系pH为7.0~8.0、最佳培养时间为40d、最佳培养温度为28~32℃和体系在湿润或淹水情况下煤矸石肥料中速效钾、有效磷含量分别比原煤矸石增加275%和395%。 相似文献
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用带空间分辨和累积时间分辨耦合系统的Raman光谱仪,测定了二元钾硅酸盐K2O·xSiO2玻璃及晶体的Raman光谱,比较并解释了随SiO2含量变化的微结构单元Raman振动模。结果表明:钾硅酸盐玻璃有多种微结构单元共存,并且随二氧化硅含量的增加,微结构逐步由硅氧四面体单体向二聚体、链状、层状和网络状转化。硅氧四面体对称伸缩振动区的主峰不对称性以及展宽主要是由于一系列具有不同微环境下的二级结构的变化造成的。微环境的不同是造成精细微结构单元和光谱表征差异的根本原因。Raman光谱的精细结构反映了微结构单元连接的复杂性,采用二级结构的概念有利于在更深层次和更大的空间范围内来认识硅酸盐玻璃微结构。 相似文献
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我公司5#58-Ⅱ、6#JN43-80型焦炉,分别于1993年12月和1999年7月建成投产。2003年5#、6#焦炉采用耐火纤维作为开闭器、二叉部及蓄热室封墙的保温材料。这种保温材料使用1年多后,保温作用下降,烟道温度明显升高。针对这种情况,我们使用了复合硅酸盐保温材料,取得了较好的保温效果 相似文献
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为探索铠装硅酸盐胶黏剂在特殊环境下的绝缘特性,本文制备不同碱金属离子含量及固液配比的硅酸钾胶黏剂样品,将其固封于不锈钢管体中,在潮湿环境与高温条件下分析其绝缘性能并进行失效分析。结果表明:在潮湿环境中,胶体中的固液配比及碱金属(K+)含量会影响铠装试样的整体绝缘性能,当固液配比为2∶1时,硅酸钾与硅溶胶质量比在(2~1)∶1之间时,其绝缘效果较佳;在高温条件下,随着温度的升高及保温时间的延长,铠装壳体中部分合金元素渗入胶体表面,造成样品绝缘性能较大幅度的下降。 相似文献
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介绍了喷雾干燥设备在速溶硅酸钠生产工艺中的应用情况 ,对干燥过程中出现的问题提出了解决的方案 ,通过对常规干燥设备进行调整和改造后得到了合格的产品 相似文献
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硝酸钾既是重要的工业原料,又是优质无氯钾、氮复合肥料,植物营养素钾、氮的总质量分数可达60%左右,是发展现代高效农业不可缺少的化肥品种。由于生产、市场、价格等方面的原因,目前硝酸钾在中国施用较少,而这种称为世界紧缺的"绿色钾肥"在欧洲国家较为盛行。伴随着高科技农业的不断发展,以及人们对食品安全要求的不断提高,中国市场对硝酸钾的需求将不断增加,不过目前这一市场仍表现出过于狭窄。简要介绍了硝酸钾的生产技术、中国硝酸钾生产发展现状、硝酸钾应用领域及市场前景,并对硝酸钾的发展提出了一些建议。 相似文献
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R. A. Wood 《Nutrient Cycling in Agroecosystems》1990,26(1-3):89-98
The amounts of N and K fertilizers used in the South African sugar industry have increased dramatically in the past four decades, due partly to an increase in the area under sugarcane but also to large increases in the amounts of N and K fertilizers applied per hectare. There has also been an increase in the amount of P fertilizer used but this has been more gradual. The main fertilizer carriers for cane and their relative efficiency are discussed. During this period there has been considerable research into the nutrient requirements of sugarcane. Correlations established between soil and leaf analysis and crop responses to N, P and K fertilizers, and their effects on cane quality, are reviewed. While fertilizer recommendations based on soil and leaf analysis have provided a useful guide for determining the nutrient requirements of cane, they are continually being modified in the light of current research. 相似文献
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Equations were developed to estimate concentrations of phosphorus and potassium for Coastal bermudagrass [Cynodon dactylon, (L.) Pers.] as related to applied nutrient level and harvest interval. Data from several field studies were used in the analysis. Estimates from these agronomic studies agreed with data from fertilizer and waste application for several locations. Concentrations of phosphorus and potassium decreased linearly with harvest interval (up to 6 weeks) and increased exponentially with nutrient level. This information should be relevant to crop production and environmental quality. 相似文献
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A series of polyurethanes containing silicon and phosphorus was prepared from 4,4′‐diphenylmethane diisocyanate (MDI), poly(tetramethylene ether glycol) (PTMG), diphenylsilanediol (DSiD), and methylphosponic acid (MPA). 1H‐NMR spectra determined the qualitative and quantitative characteristics of these polymers. The thermal stability and activation energy for thermal degradation of these polymers were measured by thermogravimtry and compared with pure polyurethane (PU). The DSiD incorporated into the main chain of the polymer improved the thermal stability of PU, while the phosphorus‐containing polyurethane (P–PU) displayed a lower thermal stability than that of pure PU. The activation energies at various degradation stages for the pure PU, silicon‐containing polyurethane (Si–PU), and P–PU polymers were calculated by the Ozawa method. The activation energies of the Si–PU polymers were higher than were those of pure PU and increased according to the increase in the DSiD content. However, the P–PU polymers' activation energies were smaller than were those of pure PU, and they decreased with increasing phosphorus content in the range of 0.1 ≤ conversion ≤ 0.5, whereas the reverse was true between 0.6 and 0.9. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 881–899, 2001 相似文献
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为了研究硅酸钙对富营养化湖水中总磷的吸附性能,分别在夏季和冬季进行了一系列实验研究。经测定,水样中总磷的质量浓度在夏季、冬季分别为0.19 mg/L和0.10 mg/L,实验结果表明:采用硅酸钙处理富营养化湖水,每100 mL水样中投加硅酸钙0.8 g,在pH=6、振荡时间为60 min的条件下,硅酸钙对富营养化湖水中总磷的去除率在夏季、冬季分别可达到89.26%和76.54%;其吸附等温线符合Langmuir和Freundlich吸附等温式,最大吸附量为5.32 mg/g。 相似文献