After phenanthrene contaminated soil is treated by g-C3N4 under visible light, the toxicity of contaminated soil was significantly reduced.
Display omitted
•Soil remediation method based on g-C3N4 is ...technologically feasible.•g-C3N4 can release O2− to degrade the phenanthrene in contaminated soil under visible light irradiation.•The toxicity of phenanthrene contaminated soil can be significantly reduced by g-C3N4.
An environmental-friendly soil remediation method based on the g-C3N4 has been developed to remediate phenanthrene contaminated soil. g-C3N4 has been synthesized by three different precursors including urea, dicyandiamide, and melamine via the conventional thermal polymerization method. Under visible light or natural sunlight, g-C3N4 exhibits excellent photocatalytic activity for the degradation of phenanthrene in contaminated soil at circumneutral pH. Compared with g-C3N4 synthesized by dicyandiamide and melamine, g-C3N4 synthesized by urea has the highest surface areas and degradation activity of phenanthrene in soil. After phenanthrene contaminated soils were treated by g-C3N4, the ecotoxicity of soils was preliminarily evaluated by cultivating plant (lettuce) and raising earthworms (Eisenia fetida). Phenanthrene contaminated soil (200 mg/kg) exhibits obvious toxicity which the growth of lettuce has been inhibited significantly and earthworms can not even survive. Under visible light or natural sunlight, g-C3N4 synthesized by three different precursors can remarkably reduce the toxicity of phenanthrene contaminated soil, which was demonstrated by the lettuce growth indexes, involving leaf length, stem length, root length, and fresh weight, and earthworms’ mortality and weight loss. However, compared with the other two g-C3N4 synthesized by dicyandiamide or melamine, g-C3N4 synthesized by urea presents clear relative toxicity on lettuces and earthworms.
Rural tourism spurs economic growth and jobs but harms the Environment due to energy demands. The study accounts for energy use, globalization, and economic growth to assess and mitigate rural ...tourism's environmental impact. For data covering 2001Q1 to 2019Q4, GMM approaches are utilized to analyze the environmental implications of rural tourist enterprises. The findings suggest that rural tourism-related catering services increased substantial and positive overall environmental quality, except N2O. However, food and beverage services negatively influence greenhouse gas emissions and only PM2.5 in air pollution. Sightseeing hurts greenhouse gas emissions while having a positive impact on air pollution. Furthermore, traveling has a considerable negative influence on CO emissions in air pollutants. Energy use only has a substantial influence on CO2 and CO, but GDP has a negative impact on N2O emissions. Globalization has a negative impact on CO2 and air pollutants other than PM2.5. Catering services associated with rural tourism positively affect overall environmental quality, excluding N2O emissions. Rural tourism's food and beverage services harm greenhouse gas emissions (including CO2) and air pollution (particularly PM2.5). Traveling has a significant negative impact on CO emissions, but sightseeing has a dual impact, both negative on greenhouse gas emissions and positive influence on air pollution. Furthermore, shopping and leisure have little impact on overall environmental quality in China. The crucial efforts' policy ramifications are addressed as well.
A 33-year male patient presented with a 6-month history of cough and shortness of breath upon physical activity. Echocardiography demonstrated right ventricular space-occupying lesions. ...Contrast-enhanced computed tomography of the chest showed multiple emboli in the pulmonary artery and its branches. Right ventricle tumor (myxoma) resection, tricuspid valve replacement, and clearance of the pulmonary artery thrombus were performed under cardiopulmonary bypass. Minimally invasive forceps and balloon urinary catheters were used to clear the thrombus. Clearance was confirmed by direct visualization using a choledochoscope. The patient recovered well and was discharged. The patient was prescribed oral warfarin 3 mg/day, and the international normalized ratio for prothrombin time was maintained between 2.0 and 3.0. Pre-discharge echocardiogram showed no lesion in the right ventricle or pulmonary arteries. The 6-month follow-up echocardiography indicated that the tricuspid valve was functioning well and showed no thrombus in the pulmonary artery.
Classification can be highly challenging when the dataset is extremely large, or when the training data in the underlying domain are difficult to obtain. One feasible solution to this challenge is ...transfer learning, which extracts the knowledge from source tasks and applies the knowledge to target tasks. Extant transfer learning schemes typically assume that similarities between the source task and the target task to some degree. This assumption does not hold in certain actual applications; analysts unfamiliar with the learning strategy can be frustrated by the complicated transfer relations and the non-intuitive transfer process. This paper presents a suite of visual communication and interaction techniques to support the transfer learning process. Furthermore, a pioneering visual-assisted transfer learning methodology is proposed in the context of classification. Our solution includes a visual communication interface that allows for comprehensive exploration of the entire knowledge transfer process and the relevance among tasks. With these techniques and the methodology, the analysts can intuitively choose relevant tasks and data, as well as iteratively incorporate their experience and expertise into the analysis process. We demonstrate the validity and efficiency of our visual design and the analysis approach with examples of text classification.
A water-soluble polysaccharide (OFPS11) was obtained from okra (Abelmoschus esculentus) flowers using aqueous extraction and purification with DEAE-52 cellulose and Sephacryl™ S-500 column. Its ...preliminary characterization and immunomodulating activity were investigated. Results showed that OFPS11 is mainly composed of galactose and rhamnose in a molar ratio of 2.23:1 with molecular mass of 1,700 kDa. RAW264.7 cells pretreated with OFPS11 significantly inhibited the proliferation of HepG-2 cells. Additionally, OFPS11 enhanced the phagocytic ability and induced the elevation of NO production, TNF-α and IL-1β secretion of RAW264.7 cells. Furthermore, OFPS11 promoted both the expression of iNOS protein and of iNOS and TNF-α mRNA. OFPS11 can strongly increase NF-κB levels in nucleuses, which is an important transcription factor that can modulate expressions of iNOS, NO and TNF-α. These outcomes support that OFPS11 exerts its antitumor activity by probably stimulating macrophage activities through nuclear NF-κB pathway.
► A low weight polysaccharide of 3.4×103Da was obtained from Schisandra chinensis. ► Oral administration resulted in higher tumor inhibition than intraperitoneal one. ► SCPP11 significantly inhibit ...growth of Heps with no obvious toxicity. ► SCPP11 could activate the host immune system in vivo and macrophage cells in vitro. ► It would be explored as a potential adjuvant against cancer.
A water-soluble low molecular weight polysaccharide (SCPP11) was extracted and purified using DEAE-cellulose and Sephadex G-100 column from Schisandra chinensis (Turcz.) Baill. Its in vivo and in vitro antitumor and immunomodulatory activity were investigated. The results showed that SCPP11 with a molecular weight of 3.4×103Da exhibited indirect cyctotoxic activity against tumor cells in vitro, but could significantly inhibit the growth of Heps cells in vivo at dose of 50mg/kg, and its inhibition rate is higher than that in the positive group. Moreover, SCPP11 could ameliorate the hematological and biochemical parameters to almost normal and no significant changes in organ weight, and could increase the body weight. In addition, SCPP11 (at 50mg/kg) could also increased in thymus indexes as well as IL-2 and TNF-α levels in serum in vivo and significantly enhance the phagocytosis activity and the productions of NO of RAW264.7 in vitro. The results indicated that antitumor properties of SCPP11 might be achieved by improving immune response. It could be explored as a potential adjuvant against cancer used in the health food and pharmaceutical therapy.
Tuberculosis (TB) is an infectious disease caused by Mycobacterium tuberculosis (Mtb), and remains a leading public health problem. Previous studies have identified host genetic factors that ...contribute to Mtb infection outcomes. However, much of the heritability in TB remains unaccounted for and additional susceptibility loci most likely exist. We perform a multistage genome-wide association study on 2949 pulmonary TB patients and 5090 healthy controls (833 cases and 1220 controls were genome-wide genotyped) from Han Chinese population. We discover two risk loci: 14q24.3 (rs12437118, P
= 1.72 × 10
, OR = 1.277, ESRRB) and 20p13 (rs6114027, P
= 2.37 × 10
, OR = 1.339, TGM6). Moreover, we determine that the rs6114027 risk allele is related to decreased TGM6 transcripts in PBMCs from pulmonary TB patients and severer pulmonary TB disease. Furthermore, we find that tgm6-deficient mice are more susceptible to Mtb infection. Our results provide new insights into the genetic etiology of TB.
•Modified TiO2 doped by C4H4O6HK was prepared by incipient wetness impregnation.•Ultrasonication is efficient with reduced time for Ti-0.7-600-6 (90.1% in 30min).•Ti-0.7-600-6 had granular and porous ...structures with high base strength.•The catalyst maintained sustained activity after being used for five cycles.•The properties of the biodiesel were comparable to international standards.
The aim of this study is to investigate modified TiO2 doped with C4H4O6HK as heterogeneous solid base catalyst for transesterification of non-edible, Silybum marianum oil to biodiesel using methanol under ultrasonication. Upon screening the catalytic performance of modified TiO2 doped with different K-compounds, 0.7 C4H4O6HK doped on TiO2 was selected. The preparation of the catalyst was done using incipient wetness impregnation method. Having doped modified TiO2 with C4H4O6HK, followed by impregnation, drying and calcination at 600°C for 6h, the catalyst was characterized by XRD, FTIR, SEM, BET, TGA, UV and the Hammett indicators. The yield of the biodiesel was proportional to the catalyst basicity. The catalyst had granular and porous structures with high basicity and superior performance. Combined conditions of 16:1 molar ratio of methanol to oil, 5 wt.% catalyst amount, 60°C reaction temperature and 30min reaction time was enough for maximum yield of 90.1%. The catalyst maintained sustained activity after five cycles of use. The oxidative stability which was the main problem of the biodiesel was improved from 2.0h to 3.2h after 30days using ascorbic acid as antioxidant. The other properties including the flash point, cetane number and the cold flow ones were however, comparable to international standards. The study indicated that Ti-0.7-600-6 is an efficient, economical and environmentally, friendly catalyst under ultrasonication for producing biodiesel from S. marianum oil with a substantial yield.
In welding tasks, the repeated positioning precision of robots can generally reach the micron level, but the data of each axis during each operation may vary. There may even be out-of-control ...situations where the robot does not run according to the set welding trajectory, which may cause the robot and equipment to collide and be damaged. Therefore, a real-time judgment method for the welding robot trajectory is proposed. Firstly, multiple sets of axis data are obtained by running the welding robot, and the phase of the data is aligned by using a proposed algorithm, and then the Kendall correlation coefficient is used to identify and remove weak axis data. Secondly, the mean of multiple sets of axis data with strong correlation is calculated as the standard trajectory, and the trajectory threshold of the robot is set using the μ ± nσ method based on the trajectory deviation judgment sensitivity. Finally, the absolute difference between the real-time axis trajectory and the standard trajectory is used to determine the deviation of the running trajectory. When the deviation reaches the threshold, a forewarning starts. When the deviation exceeds the threshold + σ, the robot is stopped. Take the six-axis welding robot as an example, by collecting the axis data of the robot running multiple times under the same conditions, it is proved that the proposed method can accurately warn the deviation of the running trajectory. The research results have important practical value for the prevention of welding robot accidents in industrial production.
► The novel AgBr/AgNbO3 composite was synthesized by two-step method. ► The photo-degradation process followed a pseudo-first-order reaction. ► The AgBr/AgNbO3 exhibited a higher photocatalytic ...activity than the pure AgNbO3. ► AgBr was doped to promote the separation of photo-generated electron–hole.
A novel AgBr/AgNbO3 composite was synthesized by a two-step method. The physical and chemical properties of catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), energy dispersive spectrometer (EDS), diffuse-reflection spectra (DRS), and photocurrent techniques. The photocatalytic performance of the samples was evaluated by photocatalytic oxidation of methylene blue (MB) dye under visible-light irradiation. The XRD, SEM-EDS, and XPS analyses indicated that the heterojunction structure had formed in the composite. The DRS analysis showed that AgBr formed on the surface of AgNbO3 had promoted the optical absorption in the visible region and made it possible to enhance the photocatalytic activity. The results indicated that the AgBr/AgNbO3 heterojunction had exhibited a much higher photocatalytic activity than the pure AgNbO3. The mechanism of the AgBr/AgNbO3 composite with enhanced heterojunction photocatalytic activity was researched.
PDF
