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1.
Ultrason Sonochem ; 58: 104706, 2019 Jul 23.
Artigo em Inglês | MEDLINE | ID: mdl-31450301

RESUMO

The objective of this paper is to investigate the counterjet dynamics generated during the bubble rebound stage near a rigid boundary via both experimental and numerical methods. In the experiments, the temporal evolution of the bubble shapes and the formation of the counterjet are recorded by the high-speed camera. The results are presented for a single bubble generated near different normalized standoff distances γ = L/Rm from 0.5 to 3, where L is the distance between bubble center and boundary, and Rm is the maximum radius of bubble. In order to account for the generation mechanism of counterjet, a 3D weakly compressible model with reformulated mass conservation equation is proposed to predict the transient process of the single bubble patterns and its surrounding flow structure, including the velocity and pressure dynamics and the pressure waves around the bubbles. The results show that the counterjet, the fluid structure opposite to the high-speed jet in the propagation direction, forms during the rebound stage when 1 < γ < 3, and the maximum height of the counterjet increases first and then decreases with the increase of γ. Furthermore, the numerical results show that the generation of counterjet is related to the shock wave induced by bubble collapse. The tension wave causes a low-pressure region at the top of the stagnation ring, which is easy to generate the cavitation bubble. And those cavitation bubbles move upwards along the flow streaming generated inside the stagnation ring, which results in the counterjet.

2.
Chemistry ; 25(51): 11991-11997, 2019 Sep 12.
Artigo em Inglês | MEDLINE | ID: mdl-31290576

RESUMO

Silicon (Si)-based anode materials with suitable engineered nanostructures generally have improved lithium storage capabilities, which provide great promise for the electrochemical performance in lithium-ion batteries (LIBs). Herein, a metal-organic framework (MOF)-derived unique core-shell Si/SiOx @NC structure has been synthesized by a facile magnesio-thermic reduction, in which the Si and SiOx matrix were encapsulated by nitrogen (N)-doped carbon. Importantly, the well-designed nanostructure has enough space to accommodate the volume change during the lithiation/delithiation process. The conductive porous N-doped carbon was optimized through direct carbonization and reduction of SiO2 into Si/SiOx simultaneously. Benefiting from the core-shell structure, the synthesized product exhibited enhanced electrochemical performance as an anode material in LIBs. Particularly, the Si/SiOx @NC-650 anode showed the best reversible capacities up to 724 and 702 mAh g-1 even after 100 cycles. The excellent cycling stability of Si/SiOx @NC-650 may be attributed to the core-shell structure as well as the synergistic effect between the Si/SiOx and MOF-derived N-doped carbon.

3.
Ultrason Sonochem ; 49: 196-205, 2018 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-30174251

RESUMO

The objective of this paper is to apply numerical method to simulate the single bubble dynamics under the acoustic standing waves, which is an extensive research of our previous work (Ma et al. Ultrason. Sonochem., vol. 42, 2018, pp. 619-630). The Navier-Stokes equation, which considers the acoustic radiation force caused by acoustic standing wave, is used to capture the transient shape variation, pressure fluctuation, and the direction of the bubble motion, especially for the case of the bubble near the rigid boundary. Several normalized parameters, such as acoustic pressure amplitude, acoustic wave number, and bubble size, are investigated in temporal and spatial scales to actively influence the direction of the liquid jet caused by bubble collapse. The numerical results show that due to the strong interaction with the acoustic standing wave, the bubble loses the spherical shape and generates a high-speed liquid jet. It worth noting that a significantly high pressure and velocity peak is respectively founded at the boundary wall, which is caused by the toroidal bubble collapse. Furthermore, in the standing wave field, single bubble would have distinctly different behaviors with the change of its resonance radius size. The high-speed liquid jet is always directed towards the node of an acoustic standing wave when the radius of bubble is larger than the resonance size, while the liquid jet is directed to the antinode when the radius of bubble is much smaller than the resonance size, closely with the primary Bjerknes force. Finally, the investigation shows that the single bubble will collapse much earlier during the deformation process with the increase of the normalized pressure amplitude.

4.
Adv Mater ; 30(35): e1802310, 2018 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-30003600

RESUMO

Despite the desirable advancement in synthesizing transition-metal phosphides (TMPs)-based hybrid structures, most methods depend on foreign-template-based multistep procedures for tailoring the specific structure. Herein, a self-template and recrystallization-self-assembly strategy for the one-step synthesis of core-shell-like cobalt phosphide (CoP) nanoparticles embedded into nitrogen and phosphorus codoped porous carbon sheets (CoP⊂NPPCS), is first proposed. Relying on the unusual coordination ability of melamine with metal ions and the cooperative hydrogen bonding of melamine and phytic acid to form a 2D network, a self-synthesized single precursor can be attained. Importantly, this approach can be easily expanded to synthesize other TMPs⊂NPPCS. Due to the unique compositional and structural characteristics, these CoP⊂NPPCSs manifest outstanding electrochemical performances as anode materials for both lithium- and potassium-ion batteries. The unusual hybrid architecture, the high specific surface area, and porous features make the CoP⊂NPPCS attractive for other potential applications, such as supercapacitors and electrocatalysis.

5.
J Microbiol Biotechnol ; 28(7): 1168-1177, 2018 Jul 28.
Artigo em Inglês | MEDLINE | ID: mdl-29975994

RESUMO

The aim of this study was to investigate the microbial community of three tannery wastewater treatment plants (WWTPs) involved in nitrification by Illumina MiSeq sequencing. The results showed that highly diverse communities were present in tannery wastewater. A total of six phyla, including Proteobacteria (37-41%), Bacteroidetes (6.04-16.80), Planctomycetes (3.65-16.55), Chloroflexi (2.51-11.48), Actinobacteria (1.91-9.21), and Acidobacteria (3.04-6.20), were identified as the main phyla, and Proteobacteria dominated in all the samples. Within Proteobacteria, Beta-proteobacteria was the most abundant class, with the sequence percentages ranging from 9.66% to 17.44%. Analysis of the community at the genus level suggested that Thauera, Gp4, Ignavibacterium, Phycisphaera, and Arenimonas were the core genera shared by at least two tannery WWTPs. A detailed analysis of the abundance of ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) indicated that Nitrosospira, Nitrosomonas, and Nitrospira were the main AOB and NOB in tannery wastewater, respectively, which exhibited relatively high abundance in all samples. In addition, real-time quantitative PCR was conducted to validate the results by quantifying the abundance of the AOB and total bacteria, and similar results were obtained. Overall, the results presented in this study may provide new insights into our understanding of key microorganisms and the entire community of tannery wastewater and contribute to improving the nitrogen removal efficiency.


Assuntos
Bactérias/classificação , Ensaios de Triagem em Larga Escala/métodos , Consórcios Microbianos/fisiologia , Nitrificação , Filogenia , Águas Residuárias/microbiologia , Bactérias/genética , Bactérias/isolamento & purificação , Sequência de Bases , China , DNA Bacteriano/análise , Genes Bacterianos/genética , Consórcios Microbianos/genética , Nitritos/metabolismo , Nitrogênio/metabolismo , Oxirredução , RNA Ribossômico 16S/genética
6.
Bioresour Technol ; 259: 294-303, 2018 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-29573608

RESUMO

The thermal behavior and kinetics of Yiluo coal (YC) and the residues of fermented cornstalk (FC) were investigated in this study. The Kissinger-Akahira-Sunose (KAS) and Flynn-Wall-Ozawa (FWO) methods were used for the kinetic analysis of the pyrolysis process. The results showed that the activation energy (Eα) was increased with the increase of the thermal conversion rate (α), and the average values of Eα of YC, FC and the blend (mYC/mFC = 6/4) were 304.26, 224.94 and 233.46 kJ/mol, respectively. The order reaction model function for the blend was also developed by the master-plots method. By comparing the Ea and the enthalpy, it was found that the blend was favored to format activated complex due to the lower potential energy barrier. Meanwhile, the average value of Gibbs free energy of the blend was 169.83 kJ/mol, and the changes of entropies indicated that the pyrolysis process was evolved from ordered-state to disordered-state.


Assuntos
Carvão Mineral , Termogravimetria , Cinética , Termodinâmica
7.
ACS Appl Mater Interfaces ; 10(14): 11642-11651, 2018 Apr 11.
Artigo em Inglês | MEDLINE | ID: mdl-29546980

RESUMO

Lithium-sulfur (Li-S) battery has been attracting increasing attention because of its high energy density and the presence of abundance of sulfur. However, its commercialization is still restricted owing to the low conductivity of sulfur, large volume expansion, and a severe polysulfide-shuttle effect. To address these problems, here, we have reported for the first time a simple template-free solvothermal method combined with a subsequent calcination method to prepare cobalt-doped vanadium nitride (VN) yolk-shell nanospheres, encapsulated in a thin layer of a nitrogen-doped carbon (Co-VN@C) composite as an ideal sulfur host. Benefiting from the unique structural advantages and the synergistic effect of conductive VN, cobalt, and nitrogen-doped carbon (NC), the obtained composite could not only facilitate the kinetics of polysulfide conversion as a functional catalyst but also physically confine and chemically absorb the polysulfides effectively. With these advantages, the batteries present a high initial discharge capacity of 1379.2 mAh g-1 at 0.1 C (1 C is defined as 1675 mA g-1), good rate performance, and excellent cycling performances (∼715 mAh g-1 at 0.5 C after 200 cycles and ∼600 mAh g-1 at 1 C after 300 cycles, respectively), even with a high areal sulfur loading of 4.07 mg cm-2 (∼830 mAh g-1 at 0.2 C after 100 cycles). These results demonstrate that the rationally designed multifunctional sulfur host material Co-VN@C has great potential for application in Li-S batteries.

8.
Ultrason Sonochem ; 43: 80-90, 2018 May.
Artigo em Inglês | MEDLINE | ID: mdl-29555291

RESUMO

The objective of this paper is to apply experimental methods to investigate the dynamics of spark-induced bubbles in the vicinity of the elastic and rigid boundary. In the experiment, the temporal evolution of the bubble is recorded by the high-speed camera at the 25,000 frames per second, as well as corresponding data such as normalized collapse position, the time of bubble collapse, and the velocity of the high-speed liquid jet. Results are presented for a single bubble generated over the elastic and rigid plates, under a wide range of normalized standoff distance from 0.5 to 3.0. The results show that the high-speed jet emitted by non-spherical bubble collapse near the boundary is one of the important factors to cause the destructive erosion pit. With the increase of the standoff distance, the expansion, shrink, jet formation, and rebound of the bubbles vary evidently adjacent to the different boundary conditions. Compared with the rigid boundary cases, the normalized first collapsed position and the time of bubble collapse are much smaller near the elastic boundary. The formation of the high-speed liquid jet in the neighborhood of the elastic/rigid boundary is founded in two different mechanisms. Furthermore, the normalized maximum velocity near the rigid plate is always larger than that near the elastic plate.

9.
Ultrason Sonochem ; 42: 619-630, 2018 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-29429710

RESUMO

The objective of this paper is to apply CLSVOF method to investigate the single bubble dynamics in acoustic travelling waves. The Naiver-Stokes equation considering the acoustic radiation force is proposed and validated to capture the bubble behaviors. And the CLSVOF method, which can capture the continuous geometric properties and satisfies mass conservation, is applied in present work. Firstly, the regime map, depending on the dimensionless acoustic pressure amplitude and acoustic wave number, is constructed to present different bubble behaviors. Then, the time evolution of the bubble oscillation is investigated and analyzed. Finally, the effect of the direction and the damping coefficient of acoustic wave propagation on the bubble behavior are also considered. The numerical results show that the bubble presents distinct oscillation types in acoustic travelling waves, namely, volume oscillation, shape oscillation, and splitting oscillation. For the splitting oscillation, the formation of jet, splitting of bubble, and the rebound of sub-bubbles may lead to substantial increase in pressure fluctuations on the boundary. For the shape oscillation, the nodes and antinodes of the acoustic pressure wave contribute to the formation of the "cross shape" of the bubble. It should be noted that the direction of the bubble translation and bubble jet are always towards the direction of wave propagation. In addition, the damping coefficient causes bubble in shape oscillation to be of asymmetry in shape and inequality in size, and delays the splitting process.

10.
Ultrason Sonochem ; 40(Pt A): 480-487, 2018 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-28946449

RESUMO

The objective of this paper is to apply the combined experimental and theoretical method to investigate the various behaviors of gas bubbles in an acoustic field. In the experiments, high-speed video and ultrasonic processor are used to capture the transient evolution of gas bubble patterns, as well as velocity profiles. In the theoretical analysis, the theories of primary and secondary Bjerknes forces and buoyancy force are introduced to accurately demonstrate the variations of bubble volume and motion. Results are presented for gas bubbles with the radius of 1.4mm under an acoustic field with a frequency of 18kHz, for three cases, namely single bubble rising in a quiescent liquid, acoustic single bubble oscillation and two bubbles coalescence conditions. The results show that the fragments around the single gas bubble presents the periodical behaviors, namely, splitting, attraction, and secondary splitting motion. The centroid of the single gas bubble almost oscillates without motion upwards or downwards, because of the equilibrium of the primary Bjerknes force caused by acoustic waves and the effect of the buoyancy force. For the two coalescing bubbles, the resultant of buoyancy, primary and secondary Bjerknes forces acting on two bubbles are same in magnitude, but in opposite direction, which indicates that two gas bubbles attract each other and and coalesce into one.

11.
Oncotarget ; 8(46): 81167-81175, 2017 Oct 06.
Artigo em Inglês | MEDLINE | ID: mdl-29113376

RESUMO

Introduction: The paper aimed to evaluate the efficacy of different therapies in improving survival among preterm infants. Materials and Methods: PubMed and Embase were searched from inception to 2017. We assessed studies for eligibility and extracted data. A Bayesian random-effects model was used to evaluate different therapies combined direct comparisons with indirect evidence. Consistency analysis was achieved using node-splitting plots. Surface under the cumulative ranking curve (SUCRA) was calculated to rank different therapies. Rankings of the competing therapies were also performed. Results: A total of 42 randomized controlled trials (RCTs) were included for the network meta-analysis. Forest plots demonstrated that dexamethasone (OR = 10.13, 95% CrI: 5.11 to 17.89) and vitamin A (OR = 28.44, 95% CrI: 14.66 to 42.11) is superior to placebo in duration of oxygen supplementation while vitamin A (OR = -29.76, 95% CrI: -57.66 to -1.75) is inferior to placebo with regard to duration of hospitalization. Also, dexamethasone (OR = 0.42, 95% CrI: 0.24 to 0.68) showed lower incidence rate of BPD.SUCRA results showed the superiority of Budesonide based on primary efficacy outcomes. In addition, dexamethasone also showed high efficacy ranking in duration of ventilation, duration of oxygen supplementation, and occurrence of BPD. Hydrocortisone was effective in reducing neonatal mortality. No significant difference was found among these drugs. Conclusions: No significant heterogeneity was found among these drugs. In general, budesonide might have the potential to be the optimal drug for its efficacy in reducing neonatal mortality and BPD, the two most essential outcome measures. Dexamethasone might be the suboptimal drug.

12.
Am J Transl Res ; 9(9): 4083-4093, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28979683

RESUMO

Oxysophocarpine (OSC) has various pharmacological effects. This study was designed to investigate whether OSC confers protection against respiratory syncytial virus (RSV) infection-induced lung injury. Here, we found that OSC inhibited RSV replication and increased the viability of RSV-infected lung epithelial A549 cells. OSC suppressed the RSV-increased production and release of pro-inflammatory cytokines and chemokines [tumor necrosis factor-α, interleukin-6 (IL-6), IL-8, regulated on activation in normal T-cell expressed and secreted, macrophage inflammatory protein-1α; and monocyte chemoattractant protein-1] in A549 cells. OSC also reduced the formation of reactive oxygen species and enhanced the activities of antioxidant enzymes in RSV-infected cells. The anti-oxidative effect of OSC on RSV-infected cells was dependent on NF-E2-related factor 2 activation. In vivo, OSC significantly alleviated RSV-triggered mouse lung injury. Overall, these results indicated that OSC attenuates RSV-enhanced pulmonary damage by inhibiting oxidative stress and inflammation.

13.
Enzyme Microb Technol ; 103: 34-41, 2017 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-28554383

RESUMO

Laccases are oxidoreductase catalyze the oxidation of a wide range of substrates with oxygen as the electron acceptor. This report was aimed to the high-level expression of a laccase, CueO from Escherichia coli K12 in Pichia pastoris GS115 and its application on decolorization of synthetic dyes. The yacK gene coding CueO was cloned into an expression vector of Pichia pastoris, pHBM905BDM and expressed in a secretory form with Pichia pastoris GS115 as the host. The yield of the recombinant protein was 556mg/L with high-density fermentation and the enzyme activity was about 41,000U/L. The recombinant laccase was purified and characterized. Its optimum pH and temperature was 3.0 and 55°C with 2, 2'-azino-bis-(3-ethylbenzothazoline-6-sulfonic acid) (ABTS) as the substrate, respectively. This recombinant protein was thermostable and its half life at 70°C was about 60min. In the presence of natural redox mediator acetosyringone, the purified recombinant laccase decolorized 98.1% and 98.5% of Congo red, malachite green, respectively. It also decolorized 90.03% of Remazol brilliant blue R without this mediator. In addition, this enzyme was applied on the decolorization of wastewater from a textile printing factory and showed an obvious bleaching effect.


Assuntos
Corantes/metabolismo , Escherichia coli K12/enzimologia , Escherichia coli K12/genética , Proteínas de Escherichia coli/genética , Proteínas de Escherichia coli/metabolismo , Lacase/genética , Lacase/metabolismo , Oxirredutases/genética , Oxirredutases/metabolismo , Biodegradação Ambiental , Biotecnologia , Fermentação , Genes Bacterianos , Microbiologia Industrial , Cinética , Pichia/enzimologia , Pichia/genética , Proteínas Recombinantes/genética , Proteínas Recombinantes/metabolismo , Especificidade por Substrato , Águas Residuárias/química
14.
Ultrason Sonochem ; 34: 164-172, 2017 01.
Artigo em Inglês | MEDLINE | ID: mdl-27773232

RESUMO

The objective of this paper is to investigate the transient conical bubble structure (CBS) and acoustic flow structure in ultrasonic field. In the experiment, the high-speed video and particle image velocimetry (PIV) techniques are used to measure the acoustic cavitation patterns, as well as the flow velocity and vorticity fields. Results are presented for a high power ultrasound with a frequency of 18kHz, and the range of the input power is from 50W to 250W. The results of the experiment show the input power significantly affects the structures of CBS, with the increase of input power, the cavity region of CBS and the velocity of bubbles increase evidently. For the transient motion of bubbles on radiating surface, two different types could be classified, namely the formation, aggregation and coalescence of cavitation bubbles, and the aggregation, shrink, expansion and collapse of bubble cluster. Furthermore, the thickness of turbulent boundary layer near the sonotrode region is found to be much thicker, and the turbulent intensities are much higher for relatively higher input power. The vorticity distribution is prominently affected by the spatial position and input power.

15.
Ultrason Sonochem ; 38: 604-613, 2017 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-27590752

RESUMO

The objective of this paper is to propose an immersed boundary lattice Boltzmann method (IB-LBM) considering the ultrasonic effect to simulate red blood cell (RBC) aggregation and deformation in ultrasonic field. Numerical examples involving the typical streamline, normalized out-of-plane vorticity contours and vector fields in pure plasma under three different ultrasound intensities are presented. Meanwhile, the corresponding transient aggregation behavior of RBCs, with special emphasis on the detailed process of RBC deformation, is shown. The numerical results reveal that the ultrasound wave acted on the pure plasma can lead to recirculation flow, which contributes to the RBCs aggregation and deformation in microvessel. Furthermore, increasing the intensity of the ultrasound wave can significantly enhance the aggregation and deformation of the RBCs. And the formation of the RBCs aggregation leads to the fluctuated and dropped vorticity value of plasma in return.


Assuntos
Agregação Eritrocítica , Modelos Biológicos , Ondas Ultrassônicas , Deformação Eritrocítica , Hemodinâmica , Plasma/citologia
16.
Protein Expr Purif ; 128: 52-9, 2016 12.
Artigo em Inglês | MEDLINE | ID: mdl-27539551

RESUMO

Neutral proteases are widely used in the textile, food and medical industries. This study was designed to obtain high expression levels of neutral protease I from Aspergillus oryzae 3.042 by using Pichia pastoris GS115 as the host strain for industrial purposes. The coding sequence of the target gene was modified, synthesized, and then cloned into the expression vector pHBM905BDM, which harbored the d1+2 × 201 AOX1 promoter and the MF4I leader sequence. The recombinant plasmid was transformed into Pichia pastoris GS115. The recombinant strain was used for high-density fermentation in a 4-L fermenter. The yield of the target protein reached 12.87 mg/mL, and the enzyme activity was approximately 49370 U/mL, which indicated that this enzyme was expressed in Pichia pastoris at a high level. The target protein was purified and characterized. Its optimum temperature and pH were 55 °C and 8.0, respectively. This enzyme was extremely sensitive to EDTA, which is consistent with the previous reports that it is a zinc-dependent metalloprotease. Our results indicated that low concentrations of zinc, calcium and magnesium ions stimulated the enzyme activity, whereas high concentrations inhibited its activity. In addition, calcium and magnesium ions increased the thermostability of the enzyme. All of the evidence indicated that this protease is a thermolysin-like peptidase.


Assuntos
Aspergillus oryzae/genética , Proteínas Fúngicas , Expressão Gênica , Metaloendopeptidases , Pichia/metabolismo , Aspergillus oryzae/enzimologia , Proteínas Fúngicas/biossíntese , Proteínas Fúngicas/genética , Proteínas Fúngicas/isolamento & purificação , Metaloendopeptidases/biossíntese , Metaloendopeptidases/química , Metaloendopeptidases/genética , Metaloendopeptidases/isolamento & purificação , Pichia/genética , Proteínas Recombinantes/biossíntese , Proteínas Recombinantes/química , Proteínas Recombinantes/genética , Proteínas Recombinantes/isolamento & purificação
17.
Protein Expr Purif ; 122: 38-44, 2016 06.
Artigo em Inglês | MEDLINE | ID: mdl-26892536

RESUMO

Proteinase K is widely used in scientific research and industries. This report was aimed to achieve high-level expression of proteinase K using Pichia pastoris GS115 as the host strain. The coding sequence of a variant of proteinase K that has higher activity than the wild type protein was chosen and optimized based on the codon usage preference of P. pastoris. The novel open reading frame was synthesized and a series of multi-copy expression vectors were constructed based on the pHBM905BDM plasmid, allowing for the tandem integration of multiple copies of the target gene into the genome of P. pastoris with a single recombination. These strains were used to study the correlation between the gene copy number and the expression level of proteinase K. The results of quantitative polymerase chain reaction (qPCR) indicated that the tandem expression cassettes were integrated into the host genome stably. Meanwhile, the results of qPCR and enzyme activity assays indicated that the mRNA and protein expression levels of the target gene increased as the gene copy number increased. Moreover, the effect of gene dosage on the expression level of the recombinant protein was more obvious using high-density fermentation. The maximum expression level and enzyme activity of proteinase K, which were obtained from the recombinant yeast strain bearing 5 copies of the target gene after an 84-h induction, were approximately 8.069 mg/mL and 108,295 U/mL, respectively. The recombinant proteinase was purified and characterized. The optimum pH and temperature for the activity of this protease were approximately pH 11 and 55 °C, respectively.


Assuntos
Ascomicetos/enzimologia , Clonagem Molecular/métodos , Endopeptidase K/genética , Pichia/genética , Ascomicetos/genética , Ascomicetos/metabolismo , Endopeptidase K/isolamento & purificação , Endopeptidase K/metabolismo , Fermentação , Dosagem de Genes , Fases de Leitura Aberta , Plasmídeos/genética , Proteínas Recombinantes/genética , Proteínas Recombinantes/isolamento & purificação , Proteínas Recombinantes/metabolismo , Recombinação Genética
18.
Artigo em Inglês | MEDLINE | ID: mdl-24023582

RESUMO

To evaluate the effectiveness of long-round needle therapy for pain relief in patients with knee osteoarthritis, 192 patients were included in a multicenter, randomized, controlled trial. 97 patients were randomized to the long-round needle therapy group (EG), and 95 patients were randomized to the control group (CG). In EG, the long-round needle therapy was performed once every 7 days for 3 therapy sessions. Ibuprofen sustained-release capsules were administered orally in CG, 1 pill each time, twice daily for 3 weeks. Curative effect was measured after the therapy and was evaluated at a 3-month follow-up interview. In EG, the treatment resulted in a basic cure for 79 patients, was effective for 15 patients, and was ineffective for 1 patient. In CG, the treatment resulted in a basic cure for 30 patients, was effective for 38 patients, and was ineffective for 21 patients. In the follow-up examination in EG, 75 patients were basically cured, and the treatment was effective for 11 patients and ineffective for 9. In CG, 22 were basically cured, 31 found the treatment effective, and 36 found the treatment ineffective. The curative effects in EG after both the treatment and the 3-mouth followup were significantly more superior than that in CG (P < 0.01) which should be adopted more widely.

19.
J Nanosci Nanotechnol ; 13(8): 5914-8, 2013 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-23882859

RESUMO

3C-SiC nanostructures have been synthesized from Si, maltose or glucose and Mg at 120 degrees C in the presence of I2. The as-obtained products are the mixtures of wire-like and tower-shaped SiC nanostructures. Transmission electron microscopy (TEM) and scanning electron microscope (SEM) images show that wire-like nanostructures are formed by the leaning-type packing of triangular nanosheets with the average diameter of 60 nm and tower-shaped nanostructures are formed by the level-type packing of nanosheets with the average diameter of 750 nm and thickness of about 40 nm. The effects of iodine, reaction time and temperature on the morphologies of the final products were also discussed.

20.
Water Sci Technol ; 64(3): 654-60, 2011.
Artigo em Inglês | MEDLINE | ID: mdl-22097044

RESUMO

The adsorption potential of lotus leaf to remove methylene blue (MB) from aqueous solution was investigated in batch and fixed-bed column experiments. Langmuir, Freundlich, Temkin and Koble-Corrigan isotherm models were employed to discuss the adsorption behavior. The results of analysis indicated that the equilibrium data were perfectly represented by Temkin isotherm and the Langmuir saturation adsorption capacity of lotus leaf was found to be 239.6 mg g(-1) at 303 K. In fixed-bed column experiments, the effects of flow rate, influent concentration and bed height on the breakthrough characteristics of adsorption were discussed. The Thomas and the bed-depth/service time (BDST) models were applied to the column experimental data to determine the characteristic parameters of the column adsorption. The two models were found to be suitable to describe the dynamic behavior of MB adsorbed onto the lotus leaf powder column.


Assuntos
Lotus/química , Azul de Metileno/química , Folhas de Planta/química , Adsorção , Termodinâmica
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