Wistar rats were exposed to trinitrotoluene (TNT) for 6 weeks. After initiation of TNT exposure, serum phosphorylase A activities and calcium contents were assayed for every 2 weeks. Both of these 2 parameters increas...Wistar rats were exposed to trinitrotoluene (TNT) for 6 weeks. After initiation of TNT exposure, serum phosphorylase A activities and calcium contents were assayed for every 2 weeks. Both of these 2 parameters increased in rats treated with 50 and 100 mg TNT/kg b.w. at 3 intervals. Serum phosphorylase A activities and calcium contents of TNT exposure worker increased too.展开更多
In order to study calcium leaching behavior for the steelmaking slag,factors that influence the leaching yield have been optimized.The results show that granularity of the slag,liquid to solid ratio（in short for L/S...In order to study calcium leaching behavior for the steelmaking slag,factors that influence the leaching yield have been optimized.The results show that granularity of the slag,liquid to solid ratio（in short for L/S）,temperature and reaction time have a significant effect on the leaching yield.The optimal conditions for leaching are determined as follows：1） the granularity at 75 μm,L/S at 100,temperature at 60 ℃;2） the granularity at 75 μm,L/S at 50,temperature at 40 ℃.Finally,the optimal leaching yield under these conditions is about 15%展开更多
Red mud is a type of highly alkaline waste residue produced in the process of alumina smelting by the Bayer process.Based on the idea of medium calcium content,solid wastes such as red mud and fly ash were used to pre...Red mud is a type of highly alkaline waste residue produced in the process of alumina smelting by the Bayer process.Based on the idea of medium calcium content,solid wastes such as red mud and fly ash were used to prepare non-burnt bricks;and the mass ratio of CaO/SiO2 was selected in the range of 0.88–1.42.Mechanical properties and durability were investigated with a compressive strength test.X-ray diffractometry(XRD),scanning electron microscope(SEM),and Fourier transform infrared spectroscopy(FTIR)techniques were used to characterize the hydration characteristic.The environmental performance was analyzed by Inductively Coupled Plasma Mass Spectrometry(ICP).The results indicated that the mechanical properties and the durability were optimal when the mass ratio of CaO/SiO2 was 1.23.The hydration products were mostly C–S–H gel,ettringite,Na4Ca(Si10All6)O32·12H2O and Ca3Al2(SiO4)(OH)8.They were responsible for the strength development,and the CaO/SiO2 mass ratio of 1.23 had the best polymerized structure.The results of an environmental performance test showed that the heavy metals in the raw materials were well-solidified in the brick.Therefore,this paper provides an effective solution for use of solid wastes in building material.展开更多
Many researchers have explored the inclusion modification mechanism to improve non-metallic inclusion modifications in steelmaking. In this study, two types of industrial trials on inclusion modifications in liquid st...Many researchers have explored the inclusion modification mechanism to improve non-metallic inclusion modifications in steelmaking. In this study, two types of industrial trials on inclusion modifications in liquid steel were conducted using ultra-low-carbon Al-killed steel with different Mg and Ca contents to verify the effects of Ca and Mg contents on the modification mechanism of Al_2O_3-based inclusions during secondary refining. The results showed that Al_2O_3-based inclusions can be modified into liquid calcium aluminate or a multi-component inclusion with the addition of a suitable amount of Ca. In addition, [Mg] in liquid steel can further reduce CaO in liquid calcium aluminate to drive its evolution into CaO–MgO–Al_2O_3 multi-component inclusions. Thermodynamic analysis confirmed that the reaction between [Mg] and CaO in liquid calcium aluminate occurs when the MgO content of liquid calcium aluminate is less than 3 wt% and the temperature is higher than 1843 K.展开更多
钙是人体必需的矿质元素,小麦作为全球主要粮食作物,其籽粒钙含量直接影响人类营养健康。通过生物强化提高小麦籽粒钙含量,是解决人体缺钙问题最经济有效的途径,然而目前小麦籽粒钙含量的分子调控机制仍不清晰。本研究对349份小麦品种(...钙是人体必需的矿质元素,小麦作为全球主要粮食作物,其籽粒钙含量直接影响人类营养健康。通过生物强化提高小麦籽粒钙含量,是解决人体缺钙问题最经济有效的途径,然而目前小麦籽粒钙含量的分子调控机制仍不清晰。本研究对349份小麦品种(系)的籽粒钙含量进行测定,结合小麦660K SNP芯片进行全基因组关联分析(GWAS,genome-wide association study)。结果显示,共检测到523个与小麦籽粒钙含量极显著相关的SNPs,主要分布在4A和6B染色体上,其中76个SNPs可以在4个及以上的重复中同时被检测到;单倍型分析表明,GCaC_Hap_4A和GCaC_Hap_6B可能是调控籽粒钙含量的重要基因位点,且两者具有明显的聚合效应;借助生物信息学分析,推测TraesCS4A03G0985800基因可能是GCaC_Hap_4A位点上的候选基因。本研究结果可为解析小麦籽粒钙含量的遗传机制和分子育种提供重要参考信息。展开更多
文摘Wistar rats were exposed to trinitrotoluene (TNT) for 6 weeks. After initiation of TNT exposure, serum phosphorylase A activities and calcium contents were assayed for every 2 weeks. Both of these 2 parameters increased in rats treated with 50 and 100 mg TNT/kg b.w. at 3 intervals. Serum phosphorylase A activities and calcium contents of TNT exposure worker increased too.
文摘In order to study calcium leaching behavior for the steelmaking slag,factors that influence the leaching yield have been optimized.The results show that granularity of the slag,liquid to solid ratio（in short for L/S）,temperature and reaction time have a significant effect on the leaching yield.The optimal conditions for leaching are determined as follows：1） the granularity at 75 μm,L/S at 100,temperature at 60 ℃;2） the granularity at 75 μm,L/S at 50,temperature at 40 ℃.Finally,the optimal leaching yield under these conditions is about 15%
基金the financial support from the National Natural Science Foundation of China (No.51574024)Fundamental Research Funds for the Central Universities (FRF-TP-18-005B1)Technological Research and Development Programs of China Railways Corporation (No.2017G006-J)
文摘Red mud is a type of highly alkaline waste residue produced in the process of alumina smelting by the Bayer process.Based on the idea of medium calcium content,solid wastes such as red mud and fly ash were used to prepare non-burnt bricks;and the mass ratio of CaO/SiO2 was selected in the range of 0.88–1.42.Mechanical properties and durability were investigated with a compressive strength test.X-ray diffractometry(XRD),scanning electron microscope(SEM),and Fourier transform infrared spectroscopy(FTIR)techniques were used to characterize the hydration characteristic.The environmental performance was analyzed by Inductively Coupled Plasma Mass Spectrometry(ICP).The results indicated that the mechanical properties and the durability were optimal when the mass ratio of CaO/SiO2 was 1.23.The hydration products were mostly C–S–H gel,ettringite,Na4Ca(Si10All6)O32·12H2O and Ca3Al2(SiO4)(OH)8.They were responsible for the strength development,and the CaO/SiO2 mass ratio of 1.23 had the best polymerized structure.The results of an environmental performance test showed that the heavy metals in the raw materials were well-solidified in the brick.Therefore,this paper provides an effective solution for use of solid wastes in building material.
基金financially supported by the Fundamental Research Funds for the Central Universities (No. FRF-TP-16-079A1)the National Science Foundation for Young Scientists of China (No. 51704021)+1 种基金the Joint Funds of National Natural Science Foundation of China (No. U1560203)supported by Beijing Key Laboratory of Special Melting and Preparation of High-end Metal Materials
文摘Many researchers have explored the inclusion modification mechanism to improve non-metallic inclusion modifications in steelmaking. In this study, two types of industrial trials on inclusion modifications in liquid steel were conducted using ultra-low-carbon Al-killed steel with different Mg and Ca contents to verify the effects of Ca and Mg contents on the modification mechanism of Al_2O_3-based inclusions during secondary refining. The results showed that Al_2O_3-based inclusions can be modified into liquid calcium aluminate or a multi-component inclusion with the addition of a suitable amount of Ca. In addition, [Mg] in liquid steel can further reduce CaO in liquid calcium aluminate to drive its evolution into CaO–MgO–Al_2O_3 multi-component inclusions. Thermodynamic analysis confirmed that the reaction between [Mg] and CaO in liquid calcium aluminate occurs when the MgO content of liquid calcium aluminate is less than 3 wt% and the temperature is higher than 1843 K.
文摘钙是人体必需的矿质元素,小麦作为全球主要粮食作物,其籽粒钙含量直接影响人类营养健康。通过生物强化提高小麦籽粒钙含量,是解决人体缺钙问题最经济有效的途径,然而目前小麦籽粒钙含量的分子调控机制仍不清晰。本研究对349份小麦品种(系)的籽粒钙含量进行测定,结合小麦660K SNP芯片进行全基因组关联分析(GWAS,genome-wide association study)。结果显示,共检测到523个与小麦籽粒钙含量极显著相关的SNPs,主要分布在4A和6B染色体上,其中76个SNPs可以在4个及以上的重复中同时被检测到;单倍型分析表明,GCaC_Hap_4A和GCaC_Hap_6B可能是调控籽粒钙含量的重要基因位点,且两者具有明显的聚合效应;借助生物信息学分析,推测TraesCS4A03G0985800基因可能是GCaC_Hap_4A位点上的候选基因。本研究结果可为解析小麦籽粒钙含量的遗传机制和分子育种提供重要参考信息。
