Notes

Multi-Layer Nanofibrous PCL Scaffold-Based Colon Cancer Mobile Civilizations to imitate Hypoxic Growth Microenvironment pertaining to Bioassay.
Nitrogen deposition may affect forest soil traits and metabolic activity. We would like to further understand the mechanisms of soil biochemical processes and habitat interactions under conditions of nitrogen deposition in forests and to investigate the characteristics of soil enzyme activities and soil environmental factors in response to nitrogen deposition in Picea schrenkiana forests in the Tianshan Mountains. In this study, nitrogen application tests were carried out using the nitrogen sedimentation gradient method on Picea schrenkiana forest soils in the Tianshan Mountains. We analyzed the characteristics of soil enzyme activity and soil environmental factors at different nitrogen application levels and discussed the correlation between soil enzyme activity and soil environmental factors in conjunction with a redundancy analysis. The study showed that① Soil enzyme activities showed a tendency to increase and then decrease with the increase in nitrogen application. With the exception of soil acid phosphaschrenkiana, Xinjiang.Cadmium (Cd) is one of the commonly found heavy metal contaminants in soil and has a toxic effect on plants and humans. Understanding the Cd resistance of soil microorganisms under different fertilization regimes can provide a theoretical basis for controlling heavy metal pollution by organic fertilizers. In order to investigate the effects of inorganic and organic fertilizers on the Cd resistance level of soil microorganisms, paddy soil samples were taken in Changzhou, Shanggao, and Fuzhou. A functional gene array (GeoChip 5.0) was used to investigate the distribution of microbial Cd resistance genes. The results indicated that the content of available Cd in soil with organic fertilizer[(1.08±0.70) mg·kg-1] was significantly lower than that in soils with inorganic fertilizer[(3.75±1.22) mg·kg-1](P less then 0.05). A total of 639 Cd resistance genes were detected. The abundance of microbial Cd resistance gene in soil with organic fertilizer was higher than that of inorganic soil. The content of available Cd, moisture content, pH, and ammonium nitrogen were important environmental factors affecting the distribution of Cd resistant microorganisms. Analysis of the molecular ecological network of Cd resistant microorganisms showed that pH, moisture content, and the effective state of the Cd content were the main factors affecting the potential interaction of functional microorganisms with inorganic fertilizer, and the main factors were total potassium and moisture content with organic fertilizer. selleck inhibitor Compared with inorganic fertilizers, the application of organic fertilizers can improve the Cd resistance level of microorganisms in soil and promote positive relationships among Cd resistant soil microorganisms.A pot experiment and field experiment were designed to study the changes in the grain methyl mercury content in paddy soil and rice yield by sowing soil amendments that contained weathered coal, CaCO3, and Na2SeO3 as the main raw materials, combined with water management in a paddy field (80% field capacity after the heading and flowering periods). The results showed that① In pot experiment, the content of methylmercury in rice rhizosphere soil decreased by 86.6% and the content of methylmercury in the rice grains decreased by 65.2% compared with that of the control. In field experiment, the content of methylmercury in rice rhizosphere soil decreased by 77.4% and the content of methylmercury in rice grains decreased by 60.6% upon adding the amendment+water management compared with that of CK. ② The soil pH increased by more than 0.3 in the pot experiment and 0.2 in the field experiment compared with that of the control. Furthermore, rice yield and plant biomass did not decrease in the two parts of the experiment. It can be inferred that the soil amendment and agronomic regulation measures (water management) used in this study have the advantages of quick effects, convenient use, and remarkable control effects and without secondary pollution. More, they can effectively reduce the risk of rice methylmercury exposure.A pot experiment was conducted to identify the effect of a tribasic amendment (limestone+diatomite+ferric sulfate, LDF) on chemical fractions of Cd and As in paddy soils and their accumulation in brown rice. LDF was set to seven levels (0, 0.5, 1.0, 2.0, 4.0, 8.0, and 16.0 g·kg-1) based on the quality ratio, and two genotypes of rice were planted (Huanghuazhan and T-you 272). The results show that① The application of LDF increased the rhizosphere soil pH of two varieties of rice, Huanghuazhan and T-you 272, by 0.01-0.42 and 0.11-0.54, respectively, and decreased the concentrations of EX-Cd by 11.1%-61.1% and 26.5%-52.9%, respectively, and the concentrations of EX-As by 8.2%-60.0% and 5.6%-49.9%, respectively. ② Application of LDF promoted the transformation of soil Cd and As from soluble to insoluble forms. Although the trends of the rhizosphere soils of the two rice varieties were not consistent, the application of LDF could decrease the proportion of EX-Cd and increase the proportion of Fe/Mn-Cd, Org-Cd, and O-Cd, which was accompanied by the reduction of the proportion of EX-As and an increase in the proportion of Ca-As. ③ The concentrations of Cd, As, and Fe in the iron plaque decreased by applying LDF, while the concentration of Mn increased, and the maximum increase of Mn could reach 124.2%. ④ Application of LDF decreased the concentrations of Cd in brown rice of the two varieties of rice by 64.6% and 65.9%, respectively, and decreased that of As by 37.0% and 42.5%, respectively. The effect on the concentrations of inorganic As was not significant. When the application amount of LDF was 2-16 g·kg-1, the concentrations of Cd and inorganic As in T-you 272 brown rice were both under 0.2 mg·kg-1, and when the application amount was 16 g·kg-1, the concentrations of Cd and inorganic As in Huanghuazhan brown rice were both under 0.2 mg·kg-1. In actual agricultural production, the application amount of LDF can be adjusted according to the soil pollution levels and the rice varieties.
Read More: https://www.selleckchem.com/products/CP-690550.html