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A Calmodulin-Binding Protein from Rice is Essential to Pollen Development
Qiusheng Zhang,Zhong Li,Jing Yang,Shaoqin Li,Daichang Yang,Yingguo Zhu 한국식물학회 2012 Journal of Plant Biology Vol.55 No.1
A pollen-expressed gene from rice, OsPCBP, that was previously cloned and identified encodes a novel calmodulin-binding protein. Here, we investigated its functioning in pollen development. Overexpression of OsPCBP in transgenic rice plants did not lead to phenotypic changes but did delay anther formation by about 1 week. Cytological observations at different stages revealed that microspores from the OsPCBP double-stranded RNA interference plants developed normally until the binucleate stage, but about half were later aborted. Meanwhile, the anther microstructure of those plants was unaffected. Further examination of OsPCBP expression in transgenic lines via RT-PCR showed that a significant reduction in transcripts was correlated with this abortion phenotype. Our experimental results provide convincing evidence that OsPCBP protein plays an important role during the late stage of pollen development.
Genetic Variations of Chinese Melon Landraces Investigated with EST-SSR Markers
Qiusheng Kong,Changping Xiang,Jin Yang,Zhongwei Yu 한국원예학회 2011 Horticulture, Environment, and Biotechnology Vol.52 No.2
SSR markers derived from expressed sequence tags (EST-SSR) are valuable tools for genetic variation assessment because they potentially exhibit functional diversity. The genetic variations of 27 melon accessions, including 21 thin-skinned melon landraces which nearly represent all types of thin-skinned melon landraces originated in China, were analyzed with ESTSSR markers. Of the 22 EST-SSR markers employed, 19 EST-SSR detected polymorphism with 13 of which had putative functions. The number of alleles detected by EST-SSR ranged from 2 to 5 with the average of 3. The PIC value for each locus varied from 0.21 to 0.68 with the mean of 0.46. Cluster analysis by UPGMA partitioned the accessions into groups of thin-skinned melon and thick-skinned melon with high bootstrap value. In the thin-skinned group, the EST-SSR markers failed to discriminate the thin-skinned vegetable melon from the other thin-skinned melon accessions.
Optimal design of wind-induced vibration control of tall buildings and high-rise structures
Li, Qiusheng,Cao, Hong,Li, Guiqing,Li, Shujing,Liu, Dikai Techno-Press 1999 Wind and Structures, An International Journal (WAS Vol.2 No.1
The most common used control device on tall buildings and high-rise structures is active and passive tuned mass damper (ATMD and TMD). The major advantages of ATMD and TMD are discussed. The existing installations of various passive/active control devices on real structures are listed. A set of parameter optimization methods is proposed to determine optimal parameters of passive tuned mass dampers under wind excitation. Simplified formulas for determining the optimal parameters are proposed so that the design of a TMD can be carried out easily. Optimal design of wind-induced vibration control of frame structures is investigated. A thirty-story tall building is used as an example to demonstrate the procedure and to verify the efficiency of ATMD and TMD with the optimal parameters.
Thermo- and pH-Responsive CeF3 Nanocrystals/HPC–PAA Complex Nanogel and Its Drug Release Behavior
Ben Liu,Qiusheng Song,Qiancheng Zhang,Haihong Ma,Ziwen Zhang,Dapeng Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.8
In this study, a kind of novel rare-earth nanocrystals/hydroxypropylcellulose–poly (acrylic acid) (HPC–PAA) complex fluorescent nanogel, its responsive behavior to environmental temperature and pH value were reported. For preparation, with HPC being used as template, HPC–PAA nanogel was first synthesized by polymerization and crosslinking reaction of acrylic acid (AA) in water solution. In the process, a redox initiator, which composed of ammonium persulfate (APS) and N,N,N′,N′-tetramethylethylenediamine (TEMED), was used to initiate the reaction. Then, the as-prepared nanogel reacted with Ce(NO3)3 and NH4F solution successively, and a novel CeF3 nanocrystals/HPC–PAA complex nanogel was fabricated. The microstructure of the nanogel was characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), Thermogravimetric (TG) and Transmission electron microscopy (TEM). The environmental sensitivity of the nanogel was investigated by photoluminescence (PL) and UV–Visible spectrophotometer (UV–Vis). The thermo- and pH-sensitive fluorescence were studied by PL at various temperatures and pH values; besides, the behavior of drug loading and release was researched by PL with a famous antibiotic of Ibuprofen as model drug. The results show that the PL intensity of the nanogel was largely affected by environmental temperature, or content of Ibuprofen loaded in the nanogel. The as-prepared nanogel can be used as useful sensitive material to detect temperature and pH value change, and drug loading or release property of Ibuprofen can be detected by PL emission of the nanogels conveniently.
Transient CHF Phenomena Due to Exponentially Increasing Heat Inputs
JONGDOC PARK,KATSUYA FUKUDA,QIUSHENG LIU 한국원자력학회 2009 Nuclear Engineering and Technology Vol.41 No.9
The critical heat flux (CHF) levels that occurred due to exponential heat inputs for varying periods to a 1.0-mm diameter horizontal cylinder immersed in various liquids were measured to develop an extended database on the effect of high subcoolings for quasi-steady-state and transient maximum heat fluxes. Two main mechanisms of CHF were found. One mechanism is due to the time lag of the hydrodynamic instability (HI) which starts at steady-state CHF upon fully developed nucleate boiling, and the other mechanism is due to the explosive process of heterogeneous spontaneous nucleation (HSN) which occurs at a certain HSN superheat in originally flooded cavities on the cylinder surface. Steady-state CHFs were divided into three regions for lower, intermediate and higher subcooling at pressures resulting from HI, transition and HSN, respectively. HSN consistently occurred in the transient boiling CHF conditions that correspond to a short period. It was also found that the transient boiling CHFs gradually increased, then rapidly decreased and finally increased again as the period became shorter.
Control of 3-D coupled responses of wind-excited tall buildings by a spatially placed TLCD system
Liang, Shuguo,Li, Qiusheng,Qu, Weilian Techno-Press 2000 Wind and Structures, An International Journal (WAS Vol.3 No.3
The possible application of a spatially placed passive tuned liquid column damper system for suppressing coupled lateral-torsional responses of tall buildings is investigated in this paper. The wind loads acting on rectangular tall buildings are analytically expressed as 3-D stochastic model. Meanwhile, the 3-D responses of tall buildings may be coupled due to eccentricities between the stiffness and mass centers of the buildings. In these cases, torsional responses of the buildings are rather larger, and a TLCD system composed of several TLCD located near the sides of the buildings is more effective than the same TLCD placed at the building center in reducing both translational and torsional responses of the buildings. In this paper, extensive analytical and numerical work has been done to present the calculation method and optimize the parameters of such TLCD systems. The numerical examples show that the spatially placed TLCD system can reduce coupled along-wind, across-wind and torsional responses significantly with a fairly small mass ratio.