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Natural uranium is an important material basis to ensure the sustainable and stable development of national nuclear energy. Ocean contains abundant natural uranium resources, and the extraction of uranium from seawater is of great strategic and economic significance for supplementing and improving our country’s uranium supply system and realizing the autonomy of natural uranium supply. In this paper, the latest progress in the research direction of seawater uranium extraction technology in recent years is reviewed. This paper mainly summarizes the research results of adsorption materials and field tests for uranium extraction from seawater at home and abroad, and prospects the future development of uranium extraction from seawater.

The clayey farmland soil in black soil region of Northeast China, due to the existence of thicker plough pan created by unreasonable tillage, is a main limiting factor for local agricultural production. In this paper, a field experiment was conducted to study the construction effect of fertile cultivated layer on crop yield, soil physical properties, soil moisture content, and soil microbial number. After the construction of fertile cultivated layer, the soil had a thicker cultivated layer, and the crop yield was increased. Comparing with traditional tillage, applying straw and organic manure into 20-35 cm soil layer decreased soil bulk density by 9.88% and 6.20%, increased soil porosity by 9.58% and 6.02%, and enhanced soil saturated hydraulic conductivity by 167.99 and 73.78%, respectively, indicating that the construction of fertile cultivated layer could improve soil aeration and water permeability, and enhance the infiltration of rainfall. The soil moisture content and water use efficiency under the application of straw and organic manure into plough pan were higher than those under traditional tillage, and a positive correlation was observed between the moisture content in 0-35 cm soil layer and the emergence of maize seedlings. Due to the increased organic carbon source and aeration in the constructed fertile cultivated layer, soil microbial number was also increased. [ABSTRACT FROM AUTHOR]

The clayey farmland soil in black soil region of Northeast China, due to the existence of thicker plough pan created by unreasonable tillage, is a main limiting factor for local agricultural production. In this paper, a field experiment was conducted to study the construction effect of fertile cultivated layer on crop yield, soil physical properties, soil moisture content, and soil microbial number. After the construction of fertile cultivated layer, the soil had a thicker cultivated layer, and the crop yield was increased. Comparing with traditional tillage, applying straw and organic manure into 20-35 cm soil layer decreased soil bulk density by 9.88% and 6.20%, increased soil porosity by 9.58% and 6.02%, and enhanced soil saturated hydraulic conductivity by 167.99 and 73.78%, respectively, indicating that the construction of fertile cultivated layer could improve soil aeration and water permeability, and enhance the infiltration of rainfall. The soil moisture content and water use efficiency under the application of straw and organic manure into plough pan were higher than those under traditional tillage, and a positive correlation was observed between the moisture content in 0-35 cm soil layer and the emergence of maize seedlings. Due to the increased organic carbon source and aeration in the constructed fertile cultivated layer, soil microbial number was also increased.

Objective: To find a better index for detecting myocardial lesion in patients with acute ammonia poisoning., Methods: Cardiac troponin T (cTnT), creatine kinase (CK), creatine kinase-MB isoenzyme (CK-MB), and electrocardiogram (ECG) were determined and compared in patients with acute ammonia poisoning and healthy controls., Results: In severe ammonia poisoning patients, the levels of cTnT [(1.285 +/- 2.650) micro g/L], CK [(257.636 +/- 362.719) IU/L], CK-MB [(20.909 +/- 19.770) IU/L] were significantly higher than those in healthy control [(0.035 +/- 0.014) micro g/L, (82.050 +/- 36.302) IU/L, (8.350 +/- 2.455) IU/L respectively, P < 0.05]. The levels of cTnT, CK and CK-MB in mild ammonia poisoning patients [(0.039 +/- 0.016) micro g/L, (78.200 +/- 28.401) IU/L and (8.467 +/- 2.669) IU/L respectively], and moderate ammonia poisoning patients [(0.054 +/- 0.043) micro g/L, (99.786 +/- 71.941) IU/L and (9.429 +/- 3.857) IU/L were not significantly different from those of healthy controls (P > 0.05)]. cTnT positive detection rate (68.2%) was significantly higher than CK (36.4%), CK-MB (31.2%) and ECG (31.2%) (P < 0.05)., Conclusion: cTnT is a better index to detect myocardial lesion in severe ammonia poisoning.