K4Ce2Nb10O30 ultrafine powders were prepared by stearic acid method (SAM). The obtained products were analyzed by X-ray diffraction, transmission electron microscopy, energy dispersive X-ray spectrometry, scanning ele...K4Ce2Nb10O30 ultrafine powders were prepared by stearic acid method (SAM). The obtained products were analyzed by X-ray diffraction, transmission electron microscopy, energy dispersive X-ray spectrometry, scanning electron microscopy and UV-visible absorption spectra. XRD patterns revealed that K4Ce2Nb10O30 powders treated at 900 oC for 2 h presented tetragonal structure without the presence of deleterious phases. Furthermore, the K4Ce2Nb10O30 prepared by SAM had considerable activity under visible light irradiation.展开更多
BACKGROUND Gastric cancer(GC)is a common type of digestive cancer with high morbidity and mortality rates worldwide.Considerable effort has been expended in understanding the mechanism of GC development and metastasis...BACKGROUND Gastric cancer(GC)is a common type of digestive cancer with high morbidity and mortality rates worldwide.Considerable effort has been expended in understanding the mechanism of GC development and metastasis.The current study therefore explores the involvement of microRNAs in the regulation of GC progression.AIM To explore the expression and function of miR-30e-3p in GC development.METHODS MiR-30e-3p was found to be downregulated in GC,with low levels thereof predicting poor outcomes among patients with GC.Functionally,we revealed that miR-30e-3p suppressed cell growth and metastatic behaviors of GC cells.Bioinformatics analysis predicted that THO complex 2(THOC2)was a direct target of miR-30e-3p,and the interaction between miR-30e-3p and THOC2 was further validated by a luciferase reporter assay.RESULTS Our findings revealed that knockdown of THOC2 inhibited the growth and metastatic behaviors of GC cells.After investigating signaling pathways involved in miR-30e-3p regulation,we found that the miR-30e-3p/THOC2 axis regulated the PI3K/AKT/mTOR pathway in GC.CONCLUSION Our findings suggest the novel functional axis miR-30e-3p/THOC2 is involved in GC development and progression.The miR-30e-3p/THOC2 axis could be utilized to develop new therapies against GC.展开更多
The stationary solution is obtained for the K–P–Burgers equation that describes the nonlinear propagations of dust ion acoustic waves in a multi-component, collisionless, un-magnetized relativistic dusty plasma cons...The stationary solution is obtained for the K–P–Burgers equation that describes the nonlinear propagations of dust ion acoustic waves in a multi-component, collisionless, un-magnetized relativistic dusty plasma consisting of electrons, positive and negative ions in the presence of charged massive dust grains. Here, the Kadomtsev–Petviashvili(K–P) equation, threedimensional(3D) Burgers equation, and K–P–Burgers equations are derived by using the reductive perturbation method including the effects of viscosity of plasma fluid, thermal energy, ion density, and ion temperature on the structure of a dust ion acoustic shock wave(DIASW). The K–P equation predictes the existences of stationary small amplitude solitary wave,whereas the K–P–Burgers equation in the weakly relativistic regime describes the evolution of shock-like structures in such a multi-ion dusty plasma.展开更多
In this paper,the dispersion relationship is derived by using the k·p method with the help of the perturbation theory,and we obtain the analytical expression in connection with the deformation potential.The calcu...In this paper,the dispersion relationship is derived by using the k·p method with the help of the perturbation theory,and we obtain the analytical expression in connection with the deformation potential.The calculation of the valence band of the biaxial strained Ge/（001）Si1-xGex is then performed.The results show that the first valence band edge moves up as Ge fraction x decreases,while the second valence band edge moves down.The band structures in the strained Ge/（001）Si 0.4 Ge 0.6 exhibit significant changes with x decreasing in the relaxed Ge along the [0,0,k] and the [k,0,0] directions.Furthermore,we employ a pseudo-potential total energy package（CASTEP） approach to calculate the band structure with the Ge fraction ranging from x = 0.6 to 1.Our analytical results of the splitting energy accord with the CASTEP-extracted results.The quantitative results obtained in this work can provide some theoretical references to the understanding of the strained Ge materials and the conduction channel design related to stress and orientation in the strained Ge pMOSFET.展开更多
An improved ethylene blue method for determination of sulfide is developed. It has been adapted to a direct determination of sulfide by both common spectrophotometric method and total differential spectrophotometric m...An improved ethylene blue method for determination of sulfide is developed. It has been adapted to a direct determination of sulfide by both common spectrophotometric method and total differential spectrophotometric method. In common spectrophotometric method, the calibration curve is A=1.69ρ + 0.006 and the correlation coefficient is 0.9994.The apparent molar absorptivity is 5.42×10 4 L·mol -1 ·cm -1 and calibration curve is liner when ρ is in the range of 0 0.9 mg·L -1 . In total differential spectrophotometric method, the calibration curve is A=9.25ρ +0.004 and the correlation coefficient is 0.9996. The apparent molar absorptivity is 2.96×10 5 L·mol -1 ·cm -1 and calibration curve is liner when ρ is in the range of 0 0.10 mg·L -1 . The sensitivity of this method is increased significantly compared with the former ethylene blue method. The speed of reaction is also faster than the former one. The limit of detection is found to be 1.0 ng·mL -1 by both common spectrophotometric method and total differential spectrophotometric method. Ten replicate analyses of a sample solution containing 100 ng·mL -1 sulfide give a relative standard deviation of 1.8%. The effects of various cations and anions on the determination of sulfide are studied and procedures for removal of interference is described. The method is used for the determination of sulfide in environment samples with satisfactory results.展开更多
The electronic properties of CdTe/ZnTe quantum rings （QRs） are investigated as functions of size and temperature using an eight-band strain-dependent k.p Hamiltonian. The size effects of diameter and height on the s...The electronic properties of CdTe/ZnTe quantum rings （QRs） are investigated as functions of size and temperature using an eight-band strain-dependent k.p Hamiltonian. The size effects of diameter and height on the strain distributions around the QRs are studied. We find that the interband transition energy, defined as the energy difference between the ground electronic and the ground heavy-hole subbands, increases with the increasing QR inner diameter regardless of the temperature, while the interband energy decreases with the increasing QR height, This is attributed to the reduction of subband energies in both the conduction and the valence bands due to the strain effects. Our model, in the framework of the finite element method and the theory of elasticity of solids, shows a good agreement with the temperature-dependent photoluminescence measurement of the interband transition energies.展开更多
基金Project supported by the National Natural Science Foundation of China (20872051) "Zijin Star" of NJUST
文摘K4Ce2Nb10O30 ultrafine powders were prepared by stearic acid method (SAM). The obtained products were analyzed by X-ray diffraction, transmission electron microscopy, energy dispersive X-ray spectrometry, scanning electron microscopy and UV-visible absorption spectra. XRD patterns revealed that K4Ce2Nb10O30 powders treated at 900 oC for 2 h presented tetragonal structure without the presence of deleterious phases. Furthermore, the K4Ce2Nb10O30 prepared by SAM had considerable activity under visible light irradiation.
基金Supported by National Natural Science Foundation of China,No.81860442Ningxia Natural Science Foundation Project,No.2022AAC03525.
文摘BACKGROUND Gastric cancer(GC)is a common type of digestive cancer with high morbidity and mortality rates worldwide.Considerable effort has been expended in understanding the mechanism of GC development and metastasis.The current study therefore explores the involvement of microRNAs in the regulation of GC progression.AIM To explore the expression and function of miR-30e-3p in GC development.METHODS MiR-30e-3p was found to be downregulated in GC,with low levels thereof predicting poor outcomes among patients with GC.Functionally,we revealed that miR-30e-3p suppressed cell growth and metastatic behaviors of GC cells.Bioinformatics analysis predicted that THO complex 2(THOC2)was a direct target of miR-30e-3p,and the interaction between miR-30e-3p and THOC2 was further validated by a luciferase reporter assay.RESULTS Our findings revealed that knockdown of THOC2 inhibited the growth and metastatic behaviors of GC cells.After investigating signaling pathways involved in miR-30e-3p regulation,we found that the miR-30e-3p/THOC2 axis regulated the PI3K/AKT/mTOR pathway in GC.CONCLUSION Our findings suggest the novel functional axis miR-30e-3p/THOC2 is involved in GC development and progression.The miR-30e-3p/THOC2 axis could be utilized to develop new therapies against GC.
文摘The stationary solution is obtained for the K–P–Burgers equation that describes the nonlinear propagations of dust ion acoustic waves in a multi-component, collisionless, un-magnetized relativistic dusty plasma consisting of electrons, positive and negative ions in the presence of charged massive dust grains. Here, the Kadomtsev–Petviashvili(K–P) equation, threedimensional(3D) Burgers equation, and K–P–Burgers equations are derived by using the reductive perturbation method including the effects of viscosity of plasma fluid, thermal energy, ion density, and ion temperature on the structure of a dust ion acoustic shock wave(DIASW). The K–P equation predictes the existences of stationary small amplitude solitary wave,whereas the K–P–Burgers equation in the weakly relativistic regime describes the evolution of shock-like structures in such a multi-ion dusty plasma.
基金Project supported by the Fundamental Research Funds for the Central Universities,China (Grant Nos. 72105499 and 72104089)the Natural Science Basic Research Plan in Shaanxi Province,China (Grant No. 2010JQ8008)
文摘In this paper,the dispersion relationship is derived by using the k·p method with the help of the perturbation theory,and we obtain the analytical expression in connection with the deformation potential.The calculation of the valence band of the biaxial strained Ge/（001）Si1-xGex is then performed.The results show that the first valence band edge moves up as Ge fraction x decreases,while the second valence band edge moves down.The band structures in the strained Ge/（001）Si 0.4 Ge 0.6 exhibit significant changes with x decreasing in the relaxed Ge along the [0,0,k] and the [k,0,0] directions.Furthermore,we employ a pseudo-potential total energy package（CASTEP） approach to calculate the band structure with the Ge fraction ranging from x = 0.6 to 1.Our analytical results of the splitting energy accord with the CASTEP-extracted results.The quantitative results obtained in this work can provide some theoretical references to the understanding of the strained Ge materials and the conduction channel design related to stress and orientation in the strained Ge pMOSFET.
文摘An improved ethylene blue method for determination of sulfide is developed. It has been adapted to a direct determination of sulfide by both common spectrophotometric method and total differential spectrophotometric method. In common spectrophotometric method, the calibration curve is A=1.69ρ + 0.006 and the correlation coefficient is 0.9994.The apparent molar absorptivity is 5.42×10 4 L·mol -1 ·cm -1 and calibration curve is liner when ρ is in the range of 0 0.9 mg·L -1 . In total differential spectrophotometric method, the calibration curve is A=9.25ρ +0.004 and the correlation coefficient is 0.9996. The apparent molar absorptivity is 2.96×10 5 L·mol -1 ·cm -1 and calibration curve is liner when ρ is in the range of 0 0.10 mg·L -1 . The sensitivity of this method is increased significantly compared with the former ethylene blue method. The speed of reaction is also faster than the former one. The limit of detection is found to be 1.0 ng·mL -1 by both common spectrophotometric method and total differential spectrophotometric method. Ten replicate analyses of a sample solution containing 100 ng·mL -1 sulfide give a relative standard deviation of 1.8%. The effects of various cations and anions on the determination of sulfide are studied and procedures for removal of interference is described. The method is used for the determination of sulfide in environment samples with satisfactory results.
基金Project supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF)the Ministry of Education,Science,and Technology,Korea (Grant No.2010-0024703)
文摘The electronic properties of CdTe/ZnTe quantum rings （QRs） are investigated as functions of size and temperature using an eight-band strain-dependent k.p Hamiltonian. The size effects of diameter and height on the strain distributions around the QRs are studied. We find that the interband transition energy, defined as the energy difference between the ground electronic and the ground heavy-hole subbands, increases with the increasing QR inner diameter regardless of the temperature, while the interband energy decreases with the increasing QR height, This is attributed to the reduction of subband energies in both the conduction and the valence bands due to the strain effects. Our model, in the framework of the finite element method and the theory of elasticity of solids, shows a good agreement with the temperature-dependent photoluminescence measurement of the interband transition energies.
