Gas-produced water is an accompanying wastewater in the natural gas extraction process,and it is a potential liquid lithium resource that contains a considerable amount of lithium.This study investigated the feasibili...Gas-produced water is an accompanying wastewater in the natural gas extraction process,and it is a potential liquid lithium resource that contains a considerable amount of lithium.This study investigated the feasibility of using manganese-based ion sieves to adsorb and extract lithium from gas-produced water.And we focused on the applicability of two different granulation methods,extrusion and droplet,in gas-produced water systems.Two types of H_(1.33)Mn_(1.67)O_(4) particles were prepared by the extrusion method(EHMO)and the droplet method(DHMO).The porosity of DHMO was much higher than that of EHMO,and the adsorption performance of DHMO increased with the decrease of binder concentration.DHMO prepared with a binder concentration of 0.14 g·ml^(-1)exhibited the best adsorption performance in gas-produced water,and the Li^(+)adsorption capacity could reach 25.14 mg·g^(-1).In gas-produced water,the adsorption equilibrium of DHMO only took 9 h,and the adsorption process conformed to the Langmuir model and pseudo-second-order kinetic model.The pore diffusion model(PDM)could well describe its adsorption process.Besides,DHMO showed a great selectivity to Li^(+),and the selectivity order of DHMO in gas-produced water was Li^(+)>Ba^(2+)>>Mg^(2+),Ca^(2+),Sr^(2+)>>Na^(+)>>K^(+).After 20 cycles,the Li^(+)adsorption capacity was still higher than 17.30 mg·g^(-1),and the rate of manganese dissolution was less than 1%.展开更多
Copper(0)-mediated reversible-deactivation radical polymerization(Cu(0)-mediated RDRP) of the water-soluble monomer Nisopropylacrylamide(NIPAM) has been challenging with the problems of high dispersity, poor control o...Copper(0)-mediated reversible-deactivation radical polymerization(Cu(0)-mediated RDRP) of the water-soluble monomer Nisopropylacrylamide(NIPAM) has been challenging with the problems of high dispersity, poor control over the molecular weights(MWs) or complex or multi reaction steps, etc. In this work, we report the well-controlled polymerization of NIPAM in water via a facile one-pot and one-step Cu(0)-mediated RDRP. The results of this approach show that the key for kicking off the Cu(0)-mediated NIPAM RDRPs is to ensure sufficient Cu~I at the very beginning, and the key to achieve a well-controlled chain growth is to provide adequate deactivation strength during the polymerization process. For NIPAM, which has a high propagation rate constant, the deactivation control can be effectively enhanced by extra adding deactivator(i.e., Cu~II) to the system. Moreover, a low reaction temperature(4 ℃) is necessary in the controlled synthesis of higher MW poly(Nisopropylacrylamide)(PNIPAM) to avoid the compromise in control caused by the phase transition from its lower critical solution temperature(LCST). Through this new kinetically controlled strategy, PNIPAMs with well-defined structure, narrow molecular weight distributions(MWDs) and varied MWs were successfully achieved.展开更多
An outer ring of 29320 self-aliging roller bearing was used in an experimental study on the casting of Zr_(41)Ti_(14)Cu_(12.5)Ni_(10)Be_(22.5) amorphous alloy.Numerical simulations of mold filling and solidification p...An outer ring of 29320 self-aliging roller bearing was used in an experimental study on the casting of Zr_(41)Ti_(14)Cu_(12.5)Ni_(10)Be_(22.5) amorphous alloy.Numerical simulations of mold filling and solidification processes were carried out to determine the velocity fields and temperature fields of the alloy melt during mold filling process as well as the temperature fields and temperature gradient fields in the course of the solidification.According to the results,a cast with a complete shape can be obtained at 1200℃under the condition that the cooling rate is greater than the critical cooling rate.The ring-shaped part with a thickness of 25 mm,an equivalent diameter of 22 mm,and a mass of 1.32 kg was prepared by gravity casting in a copper mold.X-ray diffraction and differential scanning calorimetry data revealed that the produced cast had the amorphous structure.展开更多
Apoptosis is a physiologically essential mechanism of cell and plays an important role in reducing the development and progression of tumors. The appealing strategy for cancer therapy is to target the lesions that ind...Apoptosis is a physiologically essential mechanism of cell and plays an important role in reducing the development and progression of tumors. The appealing strategy for cancer therapy is to target the lesions that induce apoptosis in cancer cells. Survivin, the smallest member of the mammalian inhibitors of the apoptosis protein family, is upregulated in various malignancies to protect cells from apoptosis. Survivin knockdown could induce cancer cell apoptosis and inhibit tumor-angiogenesis. Survivin expression would be silenced by microRNA （miRNA）-mediated RNA interference. However noninvasive and tissue-specific gene delivery techniques remain absent recently and the utilizations of miRNA expression vectors have been limited by inefficient delivery technique, especially in vivo. On the other hand, safe and promising technologies of gene transfection would be valuable in clinical gene therapy. Successful treatment of gene transfer method would lead to a new and readily available approach in the anticancer research. Sonoporation is an alternative technique of gene delivery that uses ultrasound targeted microbubble destruction to create pores in the cell membrane. Based on our previous studies, in this article, we postulated that the transfection of miRNA could be mediated by the combination of sonoporation and polyethylenimine （PEI） which was one of the most effective poly-cationic gene vectors and enhance the endocytosis of plasmids DNA and hypothesized that the gene silencing and apoptosis induction with miRNA targeting human Survivin would be improved by this novel technique. In our opinion, this novel combination of sonoporation and PEI could enhance targeted gene delivery effectively and might be a feasible, novel candidate for gene therapy.展开更多
Background:Brucellosis is a worldwide zoonotic disease caused by Brucella spp.Brucella invades the body through the skin mucosa,digestive tract,and respiratory tract.However,only a few studies on human spontaneous abo...Background:Brucellosis is a worldwide zoonotic disease caused by Brucella spp.Brucella invades the body through the skin mucosa,digestive tract,and respiratory tract.However,only a few studies on human spontaneous abortion attributable to Brucella have been reported.In this work,the patient living in Shanxi Province in China who had suffered a spontaneous abortion was underwent pathogen detection and Brucella melitensis biovar 3 was identified.Case presentation:The patient in this study was 22 years old.On July 16,2015,she was admitted to Shanxi Grand Hospital,Shanxi Province,China because of one day of vaginal bleeding and three days of abdominal distension accompanied by fever after five months of amenorrhea.A serum tube agglutination test for brucellosis and blood culture were positive.At the time of discharge,she was prescribed oral doxycycline(100 mg/dose,twice a day)and rifampicin(600 mg/dose,once daily)for 6 weeks as recommended by the World Health Organization(WHO).No recurrence was observed during the six months of follow-up after the cessation of antibiotic treatment.Conclusions:This is the first reported case of miscarriage resulting from Brucella melitensis biovar 3 isolated from a pregnant woman who was infected through unpasteurized milk in China.Brucellosis infection was overlooked in the Maternity Hospital because of physician unawareness.Early recognition and prompt treatment of brucellosis infection are crucial for a successful outcome in pregnancy.展开更多
Objective:To observe the clinical therapeutic effect of adjuvant treatment with heat-sensitive moxibustion for coronavirus disease 2019(COVID-19)of the ordinary type.Methods:A total of 42 patients with COVID-19 of the...Objective:To observe the clinical therapeutic effect of adjuvant treatment with heat-sensitive moxibustion for coronavirus disease 2019(COVID-19)of the ordinary type.Methods:A total of 42 patients with COVID-19 of the ordinary type were adopted.Shenque(神阙CV8)and Tianshu(天枢ST25)were selected.Heat-sensitive moxibustion was operated according to the required standard,40 min to 60 min each time,once daily.Before and after moxibustion,the improvements in clinical symptoms were evaluated,such as chest oppression,poor appetite,lassitude and negative emotions.Results:(1)The number of cases and the incidence was 21 cases(50.0%),24 cases(57.1%)and 26 cases(61.9%)for chest oppression,poor appetite and lassitude before heat-sensitive moxibustion.The number of cases was reduced to be 10 cases(23.8%),7 cases(16.7%)and 4 cases(9.5%)after the 1 st treatment of heat-sensitive moxibustion for chest oppression,poor appetite,and lassitude.It was reduced to be 11 cases(26.2%),8 cases(19.0%)and 4 cases(9.5%)after the 2 nd treatment of moxibustion and it was reduced to be 18 cases(42.9%),10 cases(23.8%)and 6 cases(14.3%)after the 3 rd treatment of moxibustion.The incidences of the symptoms were all reduced obviously as compared with those before treatment.(2)Before treatment with heat-sensitive moxibustion,there were 24 cases of negative emotions(57.1%).It was reduced to be 16 cases(38.1%),11 cases(26.2%)and 3 cases(7.1%)after the 1 st,2 nd and 3 rd treatment of heat-sensitive moxibustion successively.The incidences were all reduced obviously as compared with those before treatment.(3)After the 1 st treatment,the active acceptance rate of heat-sensitive moxibustion was 100%(42/42)in the patients,higher than 11.9%(5/42)before treatment.Conclusion:Adjuvant treatment with heat-sensitive moxibustion effectively relieves the symptoms of COVID-19 such as chest oppression,poor appetite and lassitude,and alleviates the negative emotions,such as tension and anxiety.This therapy improves the therapeutic effect of COVID-19 and deserves to展开更多
To detect gatifloxacin （GAT） residue in swine urine, an electrochemical immunoassay was established, An indirect competitive immunoassay was developed, in which the coating antigen is immobilized in an enzyme-linked...To detect gatifloxacin （GAT） residue in swine urine, an electrochemical immunoassay was established, An indirect competitive immunoassay was developed, in which the coating antigen is immobilized in an enzyme-linked immunosorbent assay （ELISA） plate and GAT residue from the sample competes with the limited binding sites in added anti-GAT antibody. Horseradish peroxidase （HRP） conjugated to goat anti-rabbit IgG was used as the enzymatic label. A carbon fiber working electrode was constructed and current signals were detected by using hydrogen peroxide as a substrate and hydroquinone as an electrochemical mediator. The electrochemical immunoassay was evaluated by analysis of GAT in buffer or swine urine and an average value of half inhibition concentration （IC50） of 8.9 ng/ml was obtained. Excellent specificity of the antibody was achieved with little cross-reaction with Iomefloxacin （3.0%）, ciprofloxacin （3.0%）, and ofloxacin （1.9%） among commonly used （fluoro）quinolones. In conclusion, the im- munoassay system developed in this research can be used as a rapid, powerful and on-site analytical tool to detect GAT residue in foods and food products.展开更多
基金supported by National Key R&D Program of China(2021YFC2902603)Shanghai Pujiang Program(2019PJD011)。
文摘Gas-produced water is an accompanying wastewater in the natural gas extraction process,and it is a potential liquid lithium resource that contains a considerable amount of lithium.This study investigated the feasibility of using manganese-based ion sieves to adsorb and extract lithium from gas-produced water.And we focused on the applicability of two different granulation methods,extrusion and droplet,in gas-produced water systems.Two types of H_(1.33)Mn_(1.67)O_(4) particles were prepared by the extrusion method(EHMO)and the droplet method(DHMO).The porosity of DHMO was much higher than that of EHMO,and the adsorption performance of DHMO increased with the decrease of binder concentration.DHMO prepared with a binder concentration of 0.14 g·ml^(-1)exhibited the best adsorption performance in gas-produced water,and the Li^(+)adsorption capacity could reach 25.14 mg·g^(-1).In gas-produced water,the adsorption equilibrium of DHMO only took 9 h,and the adsorption process conformed to the Langmuir model and pseudo-second-order kinetic model.The pore diffusion model(PDM)could well describe its adsorption process.Besides,DHMO showed a great selectivity to Li^(+),and the selectivity order of DHMO in gas-produced water was Li^(+)>Ba^(2+)>>Mg^(2+),Ca^(2+),Sr^(2+)>>Na^(+)>>K^(+).After 20 cycles,the Li^(+)adsorption capacity was still higher than 17.30 mg·g^(-1),and the rate of manganese dissolution was less than 1%.
基金financially supported by the Science Foundation Ireland (SFI) Frontiers for the Future 2019 call (No.19/FFP/6522)the National Natural Science Foundation of China (NSFC)(No.51873179)Irish Research Council (IRC) Government of Ireland Postdoctoral Fellowship (No.GOIPD/2022/209)。
文摘Copper(0)-mediated reversible-deactivation radical polymerization(Cu(0)-mediated RDRP) of the water-soluble monomer Nisopropylacrylamide(NIPAM) has been challenging with the problems of high dispersity, poor control over the molecular weights(MWs) or complex or multi reaction steps, etc. In this work, we report the well-controlled polymerization of NIPAM in water via a facile one-pot and one-step Cu(0)-mediated RDRP. The results of this approach show that the key for kicking off the Cu(0)-mediated NIPAM RDRPs is to ensure sufficient Cu~I at the very beginning, and the key to achieve a well-controlled chain growth is to provide adequate deactivation strength during the polymerization process. For NIPAM, which has a high propagation rate constant, the deactivation control can be effectively enhanced by extra adding deactivator(i.e., Cu~II) to the system. Moreover, a low reaction temperature(4 ℃) is necessary in the controlled synthesis of higher MW poly(Nisopropylacrylamide)(PNIPAM) to avoid the compromise in control caused by the phase transition from its lower critical solution temperature(LCST). Through this new kinetically controlled strategy, PNIPAMs with well-defined structure, narrow molecular weight distributions(MWDs) and varied MWs were successfully achieved.
基金the National Natural Science Foundation of China(Nos.52071278,51827801)the National Key Research and Development Program of China(No.2018YFA0703603)the Hebei Normal University of Science&Technology,China(No.2021YB012).
文摘An outer ring of 29320 self-aliging roller bearing was used in an experimental study on the casting of Zr_(41)Ti_(14)Cu_(12.5)Ni_(10)Be_(22.5) amorphous alloy.Numerical simulations of mold filling and solidification processes were carried out to determine the velocity fields and temperature fields of the alloy melt during mold filling process as well as the temperature fields and temperature gradient fields in the course of the solidification.According to the results,a cast with a complete shape can be obtained at 1200℃under the condition that the cooling rate is greater than the critical cooling rate.The ring-shaped part with a thickness of 25 mm,an equivalent diameter of 22 mm,and a mass of 1.32 kg was prepared by gravity casting in a copper mold.X-ray diffraction and differential scanning calorimetry data revealed that the produced cast had the amorphous structure.
文摘Apoptosis is a physiologically essential mechanism of cell and plays an important role in reducing the development and progression of tumors. The appealing strategy for cancer therapy is to target the lesions that induce apoptosis in cancer cells. Survivin, the smallest member of the mammalian inhibitors of the apoptosis protein family, is upregulated in various malignancies to protect cells from apoptosis. Survivin knockdown could induce cancer cell apoptosis and inhibit tumor-angiogenesis. Survivin expression would be silenced by microRNA （miRNA）-mediated RNA interference. However noninvasive and tissue-specific gene delivery techniques remain absent recently and the utilizations of miRNA expression vectors have been limited by inefficient delivery technique, especially in vivo. On the other hand, safe and promising technologies of gene transfection would be valuable in clinical gene therapy. Successful treatment of gene transfer method would lead to a new and readily available approach in the anticancer research. Sonoporation is an alternative technique of gene delivery that uses ultrasound targeted microbubble destruction to create pores in the cell membrane. Based on our previous studies, in this article, we postulated that the transfection of miRNA could be mediated by the combination of sonoporation and polyethylenimine （PEI） which was one of the most effective poly-cationic gene vectors and enhance the endocytosis of plasmids DNA and hypothesized that the gene silencing and apoptosis induction with miRNA targeting human Survivin would be improved by this novel technique. In our opinion, this novel combination of sonoporation and PEI could enhance targeted gene delivery effectively and might be a feasible, novel candidate for gene therapy.
基金This study was supported by the Science and Technology Project of the Shanxi Province Health and Family Planning Commission(No.2011077)the National Natural Science Foundation of China(No.81271900)The funders contributed to the study design and data collection.
文摘Background:Brucellosis is a worldwide zoonotic disease caused by Brucella spp.Brucella invades the body through the skin mucosa,digestive tract,and respiratory tract.However,only a few studies on human spontaneous abortion attributable to Brucella have been reported.In this work,the patient living in Shanxi Province in China who had suffered a spontaneous abortion was underwent pathogen detection and Brucella melitensis biovar 3 was identified.Case presentation:The patient in this study was 22 years old.On July 16,2015,she was admitted to Shanxi Grand Hospital,Shanxi Province,China because of one day of vaginal bleeding and three days of abdominal distension accompanied by fever after five months of amenorrhea.A serum tube agglutination test for brucellosis and blood culture were positive.At the time of discharge,she was prescribed oral doxycycline(100 mg/dose,twice a day)and rifampicin(600 mg/dose,once daily)for 6 weeks as recommended by the World Health Organization(WHO).No recurrence was observed during the six months of follow-up after the cessation of antibiotic treatment.Conclusions:This is the first reported case of miscarriage resulting from Brucella melitensis biovar 3 isolated from a pregnant woman who was infected through unpasteurized milk in China.Brucellosis infection was overlooked in the Maternity Hospital because of physician unawareness.Early recognition and prompt treatment of brucellosis infection are crucial for a successful outcome in pregnancy.
基金Key Research and Development Project of Traditional Chinese Medicine in Jiangxi Province:2020J007。
文摘Objective:To observe the clinical therapeutic effect of adjuvant treatment with heat-sensitive moxibustion for coronavirus disease 2019(COVID-19)of the ordinary type.Methods:A total of 42 patients with COVID-19 of the ordinary type were adopted.Shenque(神阙CV8)and Tianshu(天枢ST25)were selected.Heat-sensitive moxibustion was operated according to the required standard,40 min to 60 min each time,once daily.Before and after moxibustion,the improvements in clinical symptoms were evaluated,such as chest oppression,poor appetite,lassitude and negative emotions.Results:(1)The number of cases and the incidence was 21 cases(50.0%),24 cases(57.1%)and 26 cases(61.9%)for chest oppression,poor appetite and lassitude before heat-sensitive moxibustion.The number of cases was reduced to be 10 cases(23.8%),7 cases(16.7%)and 4 cases(9.5%)after the 1 st treatment of heat-sensitive moxibustion for chest oppression,poor appetite,and lassitude.It was reduced to be 11 cases(26.2%),8 cases(19.0%)and 4 cases(9.5%)after the 2 nd treatment of moxibustion and it was reduced to be 18 cases(42.9%),10 cases(23.8%)and 6 cases(14.3%)after the 3 rd treatment of moxibustion.The incidences of the symptoms were all reduced obviously as compared with those before treatment.(2)Before treatment with heat-sensitive moxibustion,there were 24 cases of negative emotions(57.1%).It was reduced to be 16 cases(38.1%),11 cases(26.2%)and 3 cases(7.1%)after the 1 st,2 nd and 3 rd treatment of heat-sensitive moxibustion successively.The incidences were all reduced obviously as compared with those before treatment.(3)After the 1 st treatment,the active acceptance rate of heat-sensitive moxibustion was 100%(42/42)in the patients,higher than 11.9%(5/42)before treatment.Conclusion:Adjuvant treatment with heat-sensitive moxibustion effectively relieves the symptoms of COVID-19 such as chest oppression,poor appetite and lassitude,and alleviates the negative emotions,such as tension and anxiety.This therapy improves the therapeutic effect of COVID-19 and deserves to
基金supported by the National High-Tech R&D Program(863)of China(Nos.07AA10Z435 and 2007AA06A407)the National Natural Science Foundation of China(No.20675048)+1 种基金the Fundamental Research Funds for the Central Universities(No.65011121)the Shandong Provincial Natural Science Foundation(No.Y2008B31),China
文摘To detect gatifloxacin （GAT） residue in swine urine, an electrochemical immunoassay was established, An indirect competitive immunoassay was developed, in which the coating antigen is immobilized in an enzyme-linked immunosorbent assay （ELISA） plate and GAT residue from the sample competes with the limited binding sites in added anti-GAT antibody. Horseradish peroxidase （HRP） conjugated to goat anti-rabbit IgG was used as the enzymatic label. A carbon fiber working electrode was constructed and current signals were detected by using hydrogen peroxide as a substrate and hydroquinone as an electrochemical mediator. The electrochemical immunoassay was evaluated by analysis of GAT in buffer or swine urine and an average value of half inhibition concentration （IC50） of 8.9 ng/ml was obtained. Excellent specificity of the antibody was achieved with little cross-reaction with Iomefloxacin （3.0%）, ciprofloxacin （3.0%）, and ofloxacin （1.9%） among commonly used （fluoro）quinolones. In conclusion, the im- munoassay system developed in this research can be used as a rapid, powerful and on-site analytical tool to detect GAT residue in foods and food products.
