Some stress response-related genes have been identified in Ustilaginoidea virens,but it is not clear whether and how defects of stress responses affect the pathogenesis processes of U.virens.In this study,we identifie...Some stress response-related genes have been identified in Ustilaginoidea virens,but it is not clear whether and how defects of stress responses affect the pathogenesis processes of U.virens.In this study,we identified a general stress response factor UvWHI2 as a homolog of Saccharomyces cerevisiae Whi2 in U.virens.The relative expression level of Uv Whi2 was significantly up-regulated during infection,suggesting that UvWHI2 may be involved in pathogenesis.Furthermore,knockout of Uv Whi2 showed decreased mycelial growth,increased conidiation in the potato sucrose medium and a defect in pathogenicity.In addition,the RNA-Seq and phenotypic analysis showed that UvWHI2 was involved in response to oxidative,hyperosmotic,cell wall stress and nutrient limitation.Further studies revealed that the defects of stress responses of the?Uvwhi2 mutant affected the formation of secondary spores on the nutrient limited surface and the rice surface,resulting in a significant reduction of pathogenicity of U.virens.Our results suggest that UvWHI2 is necessary for fungal growth,stress responses and the formation of secondary spores in U.virens.In addition,the defects of stress responses can affect the formation of secondary spores on the rice surface,and then compromise the pathogenicity of U.virens.展开更多
The quantized center of mass(c.m.)motion of a single two-level atom or ion confined in a one-dimensional harmonic potential and interacting with a single-mode classical traveling laser field,is investigated.We show th...The quantized center of mass(c.m.)motion of a single two-level atom or ion confined in a one-dimensional harmonic potential and interacting with a single-mode classical traveling laser field,is investigated.We show that both quadrature and amplitude squared squeezed vibrational states can be generated in this simple trap model when c.m.motion is initially in a certain coherent trap state.展开更多
A novel recipe is proposed to generate nonclassical vibrational states of the center-of mass motions of ions in a quantized trap,based on the quantum conversion between the quantum cavity fields and the quantized trap...A novel recipe is proposed to generate nonclassical vibrational states of the center-of mass motions of ions in a quantized trap,based on the quantum conversion between the quantum cavity fields and the quantized trap.It is shown that,when an ion trap system interacts with the eigen mode of a single-mode Fabry-Pérot cavity where the trap was set in,and a particularly selected external laser pulse through Raman transitions,the interchange of the quantum features between the quantum light states and the quantized trap states occurs.This kind of quantum conversion can be used to prepare some nonclassical trap states in an ion trap as well as to measure the properties of initial nonclassical vibrational states.展开更多
A scheme for the generation of a nonclassical Bose-Einstein condensate is proposed in a J_(g)=1→J_(e)=0 system where ultracold atoms are populated in one ground-state sublevel|g_〉and form a Bose-Einstein condensate....A scheme for the generation of a nonclassical Bose-Einstein condensate is proposed in a J_(g)=1→J_(e)=0 system where ultracold atoms are populated in one ground-state sublevel|g_〉and form a Bose-Einstein condensate.By coupling the condensate to copropagating classical(σ^(-))and quantum(σ^(+))non-resonant travelling-wave laser fields,effective two-photon excitations between two ground-state sublevels|g_〉and|g+〉create a new condensate in|g+〉.For an appropriate selection of the interaction time and atom-field coupling strengths,the quantum features of the quantized laser field,which may be prepared in a certain nonclassical state,can be exchanged with those of the quantum density field of the generated condensate.展开更多
An electric-magnetic isotope separator was used to separate fullerence molecules C_(60) and C_(70) produced by dc contact arc vaporization then extracting method.The potential for the analysis of huge fullerence molec...An electric-magnetic isotope separator was used to separate fullerence molecules C_(60) and C_(70) produced by dc contact arc vaporization then extracting method.The potential for the analysis of huge fullerence molecules and the producing of macroscopic quantity of any fullerence molecules was revealed.It also showed that the secondly ionized molecules might be produced in the sample preparing process.展开更多
The hyperfine structure(hfs)of three ^(235)U high-lying levels has been measured by using a hollow-cathode lamp and laser-induced fluorescence technique.These transitions are from the first excited states at 16900 and...The hyperfine structure(hfs)of three ^(235)U high-lying levels has been measured by using a hollow-cathode lamp and laser-induced fluorescence technique.These transitions are from the first excited states at 16900 and 16505cm^(-1) to the higher exited states.From the measured spectra,the isotope shifts and hfs widths for these levels are determined,and the hfs constants A and B for two levels are obtained.展开更多
Hyperfine structures of La1 are reported using Doppler-free intermodulated fluorescence,Doppler-limited laser induced fluorescence and optogalvanic spectroscopy in a home-made cathode discharge tube.The constants A an...Hyperfine structures of La1 are reported using Doppler-free intermodulated fluorescence,Doppler-limited laser induced fluorescence and optogalvanic spectroscopy in a home-made cathode discharge tube.The constants A and B for the levels at 20197.34,21447.86cm^(-1) and constant A for the levels at 19379.40,18156.97,94910.38,and 24409.68cm^(-1) are reported.A homogeneous linewidth less than 40MHz and the different resolutions between fluorescence and optogalvanic spectroscopy were observed.展开更多
By means of the Bloch equations coupled with Maxwell equations,we treated the propagation effect of coherent optical pulses in dissipative two-level system.In such system we observed the special transient coherent phe...By means of the Bloch equations coupled with Maxwell equations,we treated the propagation effect of coherent optical pulses in dissipative two-level system.In such system we observed the special transient coherent phenomena which include the stair-like decrease of pulse area and periodic spatial oscillation of the ionized particles.展开更多
It is reported here that synchronous amplification and tuning of 30ps pulses from the short cavity dye laser pumped by copper bromide laser have been achieved by a dye amplifier-dispersion system.It can be tuned conti...It is reported here that synchronous amplification and tuning of 30ps pulses from the short cavity dye laser pumped by copper bromide laser have been achieved by a dye amplifier-dispersion system.It can be tuned continuously from 570 to 590nm to be almost Fourier-transform limited when using Rh6G solution.展开更多
The transient phenomena of output from a short cavity dye laser(SCDL)pumped by a copper bromide laser are investigated.For the first time a 30ps dye laser pulse was generated,wing the SCDL with Rh6G and DODCI dissolve...The transient phenomena of output from a short cavity dye laser(SCDL)pumped by a copper bromide laser are investigated.For the first time a 30ps dye laser pulse was generated,wing the SCDL with Rh6G and DODCI dissolved in ethanol.展开更多
基金funded by the Zhejiang Provincial Natural Science Foundation of China(Grant No.LQ19C140004)the Key Research and Development Project of Zhejiang Province,China(Grant No.2019C02018)Key Research and Development Project of China National Rice Research Institute(Grant No.CNRRI-2020-04)。
文摘Some stress response-related genes have been identified in Ustilaginoidea virens,but it is not clear whether and how defects of stress responses affect the pathogenesis processes of U.virens.In this study,we identified a general stress response factor UvWHI2 as a homolog of Saccharomyces cerevisiae Whi2 in U.virens.The relative expression level of Uv Whi2 was significantly up-regulated during infection,suggesting that UvWHI2 may be involved in pathogenesis.Furthermore,knockout of Uv Whi2 showed decreased mycelial growth,increased conidiation in the potato sucrose medium and a defect in pathogenicity.In addition,the RNA-Seq and phenotypic analysis showed that UvWHI2 was involved in response to oxidative,hyperosmotic,cell wall stress and nutrient limitation.Further studies revealed that the defects of stress responses of the?Uvwhi2 mutant affected the formation of secondary spores on the nutrient limited surface and the rice surface,resulting in a significant reduction of pathogenicity of U.virens.Our results suggest that UvWHI2 is necessary for fungal growth,stress responses and the formation of secondary spores in U.virens.In addition,the defects of stress responses can affect the formation of secondary spores on the rice surface,and then compromise the pathogenicity of U.virens.
文摘The quantized center of mass(c.m.)motion of a single two-level atom or ion confined in a one-dimensional harmonic potential and interacting with a single-mode classical traveling laser field,is investigated.We show that both quadrature and amplitude squared squeezed vibrational states can be generated in this simple trap model when c.m.motion is initially in a certain coherent trap state.
文摘A novel recipe is proposed to generate nonclassical vibrational states of the center-of mass motions of ions in a quantized trap,based on the quantum conversion between the quantum cavity fields and the quantized trap.It is shown that,when an ion trap system interacts with the eigen mode of a single-mode Fabry-Pérot cavity where the trap was set in,and a particularly selected external laser pulse through Raman transitions,the interchange of the quantum features between the quantum light states and the quantized trap states occurs.This kind of quantum conversion can be used to prepare some nonclassical trap states in an ion trap as well as to measure the properties of initial nonclassical vibrational states.
文摘A scheme for the generation of a nonclassical Bose-Einstein condensate is proposed in a J_(g)=1→J_(e)=0 system where ultracold atoms are populated in one ground-state sublevel|g_〉and form a Bose-Einstein condensate.By coupling the condensate to copropagating classical(σ^(-))and quantum(σ^(+))non-resonant travelling-wave laser fields,effective two-photon excitations between two ground-state sublevels|g_〉and|g+〉create a new condensate in|g+〉.For an appropriate selection of the interaction time and atom-field coupling strengths,the quantum features of the quantized laser field,which may be prepared in a certain nonclassical state,can be exchanged with those of the quantum density field of the generated condensate.
文摘An electric-magnetic isotope separator was used to separate fullerence molecules C_(60) and C_(70) produced by dc contact arc vaporization then extracting method.The potential for the analysis of huge fullerence molecules and the producing of macroscopic quantity of any fullerence molecules was revealed.It also showed that the secondly ionized molecules might be produced in the sample preparing process.
基金Supported by the Naiional Natural Science Foundiiion of China.
文摘The hyperfine structure(hfs)of three ^(235)U high-lying levels has been measured by using a hollow-cathode lamp and laser-induced fluorescence technique.These transitions are from the first excited states at 16900 and 16505cm^(-1) to the higher exited states.From the measured spectra,the isotope shifts and hfs widths for these levels are determined,and the hfs constants A and B for two levels are obtained.
基金Supported by National Natural Science Foundation of China.
文摘Hyperfine structures of La1 are reported using Doppler-free intermodulated fluorescence,Doppler-limited laser induced fluorescence and optogalvanic spectroscopy in a home-made cathode discharge tube.The constants A and B for the levels at 20197.34,21447.86cm^(-1) and constant A for the levels at 19379.40,18156.97,94910.38,and 24409.68cm^(-1) are reported.A homogeneous linewidth less than 40MHz and the different resolutions between fluorescence and optogalvanic spectroscopy were observed.
文摘By means of the Bloch equations coupled with Maxwell equations,we treated the propagation effect of coherent optical pulses in dissipative two-level system.In such system we observed the special transient coherent phenomena which include the stair-like decrease of pulse area and periodic spatial oscillation of the ionized particles.
文摘It is reported here that synchronous amplification and tuning of 30ps pulses from the short cavity dye laser pumped by copper bromide laser have been achieved by a dye amplifier-dispersion system.It can be tuned continuously from 570 to 590nm to be almost Fourier-transform limited when using Rh6G solution.
文摘The transient phenomena of output from a short cavity dye laser(SCDL)pumped by a copper bromide laser are investigated.For the first time a 30ps dye laser pulse was generated,wing the SCDL with Rh6G and DODCI dissolved in ethanol.
