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Two-color field for the generation of an isolated attosecond pulse in water-window region.
Chen, Wenxiang,Chen, Guanglong,Kim, Dong Eon Optical Society of America 2011 Optics express Vol.19 No.21
<P>For the investigation of various ultrafast electron dynamics, an isolated attosecond pulse in a broad spectral range is necessary. The generation of isolated attosecond pulses demands the manipulation of the electric field of a laser. We propose a two-color field scheme for generating an isolated attosecond pulse in the water-window region. Two-color fields are generated by mixing two equally-strong pulsed color fields. The investigation shows that an isolated attosecond pulse with a photon energy of near 500 eV and a pulse duration of 125 - 188 attoseconds can be generated using 10 - 15 fs FWHM laser fields.</P>
Overexpression of the intertidal seagrass J protein ZjDjB1 enhances tolerance to chilling injury
Chen Siting,Qiu Guanglong 한국식물생명공학회 2022 Plant biotechnology reports Vol.16 No.4
DnaJ proteins act as molecular chaperones to maintain protein homeostasis under stress. However, their role in seagrass remains largely unidentified. We found that the expression of ZjDjB1, a class II J gene of Zostera japonica, was up-regulated under low-temperature stress. Therefore, we cloned ZjDjB1 from Z. japonica, a typical intertidal seagrass. The role of nuclear and cytoplasmic-targeted DnaJ protein (ZjDjB1) in Z. japonica was studied. Under low-temperature stress, the rates of ger- mination and survival of overexpressed Arabidopsis thaliana were higher than those of the wild-type (WT); the root length was longer; the detached leaves were more tolerant to low temperature, and the chlorophyll content of leaves, relative water content and dry weight of shoot were higher. Overexpressed plants accumulated more osmotic protective substances under low-temperature stress, and the antioxidant enzyme activity of overexpressed plants was higher than that of the WT plants. Under low-temperature stress, overexpressed plants accumulated fewer reactive oxygen species. The root cell viability of overexpressed plants was higher than that of WT under low-temperature stress, and there was minimal membrane damage in the overexpressed plants. Furthermore, the level of expression of CBF1 and CBF target genes, including KIN1 and COR15B, was higher in overexpressed plants than that in the WT plants when subjected to low temperature. These results indicate that ZjDjB1 plays an important role in plant resistance to injury under low-temperature stress.
Chen Siting,Qiu Guanglong 한국식물생명공학회 2022 Plant biotechnology reports Vol.16 No.6
Salinity afects the physiological activities of seagrass by changing the osmotic pressure of seagrass cells, which then afects the structure and function of seagrass community. In this study, we created transgenic Arabidopsis that overexpressed the ZjGRF1 gene from the intertidal seagrass Zostera japonica. We found that transgenic ZjGRF1 Arabidopsis has stronger tolerance to salt stress and osmotic stress than wild type. Under salt stress, the content of reactive oxygen species in transgenic ZjGRF1 Arabidopsis was lower than that in wild-type Arabidopsis. The viability of root cells in transgenic ZjGRF1 Arabidopsis was higher than that of wild type under salt stress. Under salt stress, transgenic ZjGRF1 Arabidopsis accumulated more proline and had higher antioxidant enzyme activities. The rate of water loss rate from overexpressed plants was lower than that of the wild-type plants. The resistance of overexpressed plants to osmotic stress may be enhanced by the ABA-dependent pathway. Our results confrm that ZjGRF1 enhances tolerance to salt and osmotic stress in Z. japonica.
Mohamed, Walid Tawfik,Chen, Guanglong,Kim, Jaehoon,Tao, Geng Xiao,Ahn, Jungkwen,Kim, Dong Eon Optical Society of America 2011 Optics express Vol.19 No.17
<P>We report the observation of longitudinally uniform plasma waveguide with a controlled length of up to nearly 5 mm, in argon clustered gas jet. This self-channeling plasma is obtained using a 35 mJ, 30 fs FWHM pulse as a pump laser pulse to create the plasma channel. A 1 mJ pulse of the same laser is used for probing the plasma channels using interferometric diagnostics. The radial distribution of the electron density confirms the formation of a plasma waveguide. Clustered argon enhances the absorption efficiency of femtosecond pulses which enables the use of pump pulses of only 35 mJ, approximately 10 times less energy than required for heating conventional gas targets. The plasma channel length is controlled by the laser focus point (F), the laser intensity (I), the pump-probe delay time (t) and the laser height from a nozzle (z). The variation of the electron density for these parameters is also studied. We found that the highest density of 1.2 x 10(19) cm(-3) was obtained at I = 5.2 x 10(16) W/cm(2), z = 2 mm and t = 7.6 ns. It was demonstrated that by using a clustered jet, both the plasma waveguide length and the plasma density could be controlled.</P>
Mei Zhu,Weijun Fu,Chen Xun,Guanglong Zou 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.1
An efficient synthetic method for the preparation of quinolines through indium(III) chloride-catalyzed tandem addition-cyclization-oxidation reactions of imines with alkynes was developed. The processes can provide a diverse range of quinoline derivatives in good yields from simple imines and alkynes.