Correlation Analysis between Cracking and Mineral Element Content of Apricot Fruit

This study aimed to clarify the effectsof mineral nutrient contents on fruit cracking so as to provide certain reference for further study on fruit cracking in apricot and basis for reasonable fertilization in the production. The 39-year-old apricot trees, with plant and row spacing of 3.0 m×4.0 m, were selected as the test materials, and the effects of contents of 7 kinds of mineral elements on the fruit cracking in apricot were analyzed. The results of variance analysis showed the intensity of correlation between mineral element content and apricot fruit cracking ranked as Ca＇s 〉 Zn＇s 〉 Mn＇s 〉 Fe＇s 〉 K＇s 〉 Mg＇s 〉 Cu＇s, The content of Ca was negatively correlated with cracking index, and the correlation ,coefficient was larger; the correlations between the contents of Zn and Mn and cracking index were weaker; and the correlations between the contents of Fe, K, Mg and Cu and cracking index were extremely weak. In conclusion, Ca deficiency is the main factor affecting fruit cracking in apricot.

Synergistic extraction of rare earth elements and alumina from coal fly ash by potassium pyrosulfate

Although coal fly ash(CFA)contains a high content of rare earth elements(REEs),the related extraction methods have limitations because of their low efficiencies,high levels of energy consumption,and other drawbacks.To address these problems,in this study,we examined the coextraction of REEs and Al_(2)O_(3)from two types of Al_(2)O_(3)-rich CFA,pulverized CFA(PCFA)and circulating fluidized bed fly ash(CFBFA)using low-temperature calcination in the presence of K_(2)S_(2)O_(7).The total REEs,heavy REEs(HREEs),and light REEs(LREEs)extraction efficiencies were determined using different K_(2)S_(2)O_(7)/Al_(2)O_(3) molar ratios and calcination temperatures and correlated with the Al_(2)O_(3) extraction efficiency using Pearson correlation coefficient analysis.The REEs are concentrated within CFA particles encapsulated in an aluminosilicate glass phase,and the REEs extraction efficiency is related to the form of Al in CFA.The extraction efficiencies of Al_(2)O_(3) and REEs increase as the K_(2)S_(2)O_(7)/Al_(2)O_(3) molar ratio and calcination temperature increase,and the extraction selectivity of the more industrially valuable HREEs from CFBFA is higher.At high K_(2)S_(2)O_(7)/Al_(2)O_(3) molar ratios,the extraction of REEs from PCFA is more efficient than that from CFBFA with the regeneration of the highly active Al-O-Si bonds in CFBFA.The Al_(2)O_(3) extraction efficiencies of PCFA as well as CFBFA correlate strongly with the total REEs,HREEs,and LREEs extraction efficiencies.The developed extraction technology has the potential to promote CFA valorization and expand REEs resources,thus mitigating the bottlenecks of REEs procurement.

煤气化渣改性工艺及吸附Cd^(2+)性能

以固体废弃物煤气化渣(CGS)为材料,通过水热法制备改性煤气化渣(MCGS)吸附材料,并用于吸附Cd^(2+)。由于CGS吸附Cd^(2+)能力较低,利用Box-Behnken响应面模型方法优化改性条件,X射线衍射仪、傅里叶变换红外光谱仪等表征CGS及制备的MCGS的物理化学性质。改性结果表明,MCGS最佳反应条件为碱度6.20%~8.10%、温度102~108℃和时间138~192 min,温度对MCGS吸附Cd^(2+)性能影响最大。改性后Si-O-Si键断裂,MCGS表面含有丰富的孔隙结构,比表面积、孔容和孔径分别为255.08 m^(2)/g,0.24 cm^(3)/g和3.72 nm;吸附结果表明,当Cd^(2+)浓度50 mg/L、MCGS投加量为0.10 g时,Cd^(2+)饱和吸附量为13.96 mg/g;当Cd^(2+)浓度40 mg/L、MCGS投加量为0.20 g时,Cd^(2+)去除率98.08%;MCGS对重金属Cd^(2+)的吸附过程符合准二级动力学模型和Langmuir模型。本研究可为CGS处理含Cd^(2+)废水提供理论依据。

抗胰岛素样生长因子1受体单链抗体复性研究

[目的]建立抗人胰岛素样生长因子1受体单链抗体包涵体复性方法。[方法]首先,在96孔板上进行稀释复性,从72种复性液中筛选最佳条件。每孔复性液2 m L,滴入起始浓度1. 5 mg/m L的包涵体溶解液100μL过夜复性。然后,选择最佳复性液与变性液混合在Superdex 75柱上形成1 cm柱长下降5%的变性液梯度,样品按5%柱体积上样进行柱上复性。[结果]最适稀释复性液为C8(50 mmol/L Tris-Cl,GSH/GSSG=5/0. 5 mmol/L,0. 4 mol/L精氨酸,p H 9.0),对应复性率约为78%;以该复性液为基础通过柱上复性,目标蛋白复性率提高到95%,复性样品抗原结合活性良好。[结论]建立了目标蛋白包涵体柱上复性方法,复性率达到95%,产量达到384 mg/L。