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ITPK1 functions as both a kinase and an ADP phosphotransferase in Pi signaling

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Molecular Plant 2021年第11期14卷 1784-1785页

作者： chun-Lin shi ANGENOVO 1414 VikenNorway College of Horticulture South China Agricultural UniversityGuangzhou 510642China

Phosphorus is one of mineral elements essential for plant growth and *** cope with low phosphate(Pi)conditions,plants have evolved complex signaling mechanisms including the inositol phosphate(InsP)signaling pathway in which the phosphate starvation response(PHR)transcription factors control the expression of Pi starvation-induced genes in a Pi-dependent *** activities of PHRs are regulated by their interactions with SPX proteins that act as receptors for inositol pyrophosphates(PP-lnsPs),such as lnsP7 and *** plants,the syn thesis of lnsP8 is mediated by the bifunctional kinase/phosphatase enzymes,VIH1 and ***,lnsP6 kinases responsible for the synthesis of lnsP7 in plants have long remained elusive.

关键词： development. ITP synthesis

Synthesis and Crystal Structure of 3,5-Diphenyl-1,2-di(4-chlorophenyl)pyrrole

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Chinese Journal of Structural Chemistry 2005年第11期24卷 1314-1317页

作者： shi Da-Qing shi chun-Ling ZHUANG Qi-Ya Department of Chemistry Xuzhou Normal University Xuzhou Jiangsu 221116 China Key Laboratory of Biotechnology on MedicalPlants of Jiangsu Province Xuzhou 221116 China

The title compound （C28H19Cl2N） has been synthesized by the reaction of dibenzoylmethane and N-（4-chlorobenzylidene）-4-chlorobenzenamine promoted by low-valent titanium reagent, and characterized by elemental analysis, IR, ^1H NMR and X-ray single-crystal diffraction. The crystal belongs to monoclinic, space group P2 1/C with a = 9.952（2）, b = 9.863（2）, c = 23.460（6） A, β = 99.62（2）°, V = 2270.4（9） A^3, Mr = 440.34, Z = 4, Dc = 1.288 g/cm^3, μ（MoKa） = 0.301 mm^-1, F（000） = 912, the final R = 0.0387 and wR = 0.0793. X-ray analysis reveals that the four phenyl rings in the pyrrole ring are not coplanar.

关键词： pyrrole low-valent titanium reagent crystal structure

Synthesis and Crystal Structure of 1-(4-Chlorophenyl)-2-cyano-3-amino-3a-hydroxy- 3a,3b,6,7-tetrahydrobenzo[4,5]indene

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Chinese Journal of Structural Chemistry 2005年第12期24卷 1393-1396页

作者： shi Da-Qing shi chun-Ling RONG Liang-Ce Department of Chemistr） Xuzhou Normal University Xuzhou 221116 China The Key Laboratory of Biotechnology on Medical Plants of Jiangsu Province Xuzhou 221116 China

The title compound 1-（4-chlorophenyl）-2-cyano-3-amino-3a-hydroxy-3a,3b,6,7- tetrahydro-benzo[4,5]indene 2, has been synthesized by the reductive cyclization of 2-cyano-3- （4-chlorophenyl）-3-（1-tetralon-2-yl） propionitrile 1 induced by low-valent titanium reagent and its structure was determined by single-crystal X-ray diffraction. The crystal belongs to monoclinic, space group C2/c with a = 28.244（7）, b = 14.401（3）, c = 21.245（3）A,β= 115.71（2）°, V = 7786（3）A^3, Mr= 696.13, Dc = 1.188 g/cm^3, Z = 8,μ（MoKα） = 0.208 mm^-1, F（000） = 2916, R = 0.0783 and wR = 0.2350. X-ray analysis reveals that the five-membered ring （C（7）～C（l l）） adopts an envelop conformation, while the six-membered ring （C（10）～C（14）, C（19）） has a half-chair conformation. Meanwhile, intermolecular H-bond interactions result in the formation of polymer.

关键词： tetrahydrobenzoindene synthesis crystal structure low-valent titanium

Microstructure and tensile properties of A356 alloy with different Sc/Zr additions

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Rare Metals 2021年第9期40卷 2514-2522页

作者： Shou-Peng Xu chun-Sheng shi Nai-Qin Zhao chun-Nian He School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials Tianjin UniversityTianjin 300350China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072China

Addition of rare earth elements for improving the tensile properties of aluminum alloys has attracted great attention. In this study, a systematic analysis on the microstructure and tensile properties of A356–0.13 Ti alloys with different contents of scandium(Sc) and scandium/zirconium(Sc/Zr) after solution and aging treatment process was carried out. The addition of Sc/Zr into A356–0.13 Ti alloys can greatly refine the grain size and modify the deleterious coarse eutectic Si structure and harmful acicular iron-containing phase morphology. As a result, the maximum value of strength(298 MPa) and ductility(elongation of 8.4%) are acquired by co-addition of Sc/Zr after solution and aging treatment process, which indicates that the tensile properties of A356 alloy are greatly enhanced by the synergistic effect of co-addition of Sc/Zr.

关键词： Aluminum alloys Sc/Zr Tensile properties Solution and aging treatment

Synthesis and Crystal Structure of 1,3-Trans-1,4-cis- 3,4-di(4-bromophenyl)-1',2',3'-trihydro-1-hydroxy- benzo[g]bicyclo[3.3]octane-2-spiro-2'-indene-1'-one

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Chinese Journal of Structural Chemistry 2006年第2期25卷 187-191页

作者： shi Da-Qing LI Zheng-Yi shi chun-Ling DOU Guo-Lan Department.of Chemistry Xuzhou Normal University Xuzhou Jiangsu 221116 China Key Laboratory of Biotechnology on Medical Plants of Jiangsu Province Xuzhou 221116 China

The title compound C35H30Br2O3 （C32H24Br2O2·CH3COCH3） has been synthesized by the dimerization of 2-（4＇-bromobenzal）-1-indenone induced by low-valent titanium reagent, and characterized by elemental analysis, IR,^1H NMR and X-ray single-crystal diffraction. The crystal belongs to triclinic, space group P1^- with a = 10.273（7）, b = 11.036（7）, c = 13.944（9） ,A°, a = 73.972（9）, β =76.577（10）,γ= 88.871（10）°, V = 1476.3（17）A°^3, Mr = 658.41, Z = 2, Dr = 1.481 g/cm^3, μ（MoKa） = 2.780 mm^-1, F（000） = 668, the final R = 0.0452 and wR = 0.0975. X-ray analysis reveals that the two cyclopentane rings spiro-fused each other adopt envelope conformations, while the other cyclopentane ring （C（1）--C（2）-C（7）-C（9）） is coplanar. In addition, there is a classical intermolecular hydrogen bond O（1）-H（1）...O（2） connecting the adjacent molecules into dimers.

关键词： benzo[g]bicyclo[3.3]octane-2-spiro-2'-indene-1'-one synthesis crystal structure,low-valent titanium

A DFT INVESTIGATION OF THE MECHANISM FOR ALTERNATINGCOPOLYMERIZATION OF STYRENE WITH CARBON MONOXIDE CATALYZED BY Pd(Ⅱ) COMPLEXES

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Chinese Journal of Polymer Science 2012年第5期30卷 744-758页

作者： Zi-dan Zhang 何学浩 shi-chun Jiang Department of Polymer Science and Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China Department of Chemistry School of ScienceTianjin UniversityTianjin300072China School of Material Science&Engineering Tianjin UniversityTianjin300072China

Density functional theory has been employed to study the homogeneous catalytic copolymerization of styrene with carbon monoxide. The copolymerization reaction is catalyzed by Pd（II） coordinated with 2,2＇-bipyridine, a conventional nitrogen-containing bidentate ligand with achiral C2v symmetry. The chain propagation mechanism for the alternating copolymerization as well as the side reactions, including multiple insertions of CO and homopolymerization of styrene, has been investigated. This study focused exclusively on regioisomerism and stereoisomerism. We have demonstrated that the strictly alternating copolymerization is kinetically and thermodynamically favored over the side reactions （i.e., multiple insertions of CO and homopolymerization of styrene）. The regiochemistry study indicates the 2,1 type. Furthermore, the stereochemistry study shows that the syndiotactic conformation is preferred over the isotactic or atactic conformations.

关键词： DFT CO Styrene Polyketone Mechanism.

The protective effect of zeaxanthin on human limbal and conjunctival epithelial cells against UV-induced cell death and oxidative stress

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International Journal of Ophthalmology(English edition) 2019年第3期12卷 369-374页

作者： Yue Huang chun shi Jing Li Department of Ophthalmology Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Department of Ophthalmology Xinhua Hospital Chong Ming Branch Shanghai Jiao Tong University School of Medicine Department of Ophthalmology Jiangwan Hospital of Hongkou District

AIM: To explore the protective effect of zeaxanthin on human limbal and conjunctival epithelial cells against UVradiation and excessive oxidative ***: Human limbal and conjunctival epithelial cells were isolated from cadaver and cultured in vitro. They were challenged with UVB radiation and H2 O2 with and without zeaxanthin pretreatment. Cell viability, p38 and c-JUN NH(2)-terminal kinase(JNK) phosphorylation, IL-6, IL-8 and MCP-1 secretion and malondialdehyde(MDA) content were ***: Zeaxanthin had no measurable cytotoxicity on limbal or conjunctival epithelial cells when used at concentrations of 5 μg/mL and below. At 30 mJ/cm2 UVB, the pretreatment of zeaxanthin increased the percentage of live cells from 50% to 69%(P=0.01) and from 66% to 75%(P=0.05) for limbal and conjunctival epithelial cells, respectively. The concentrations of IL-6, IL-8 and MCP-1 in the culture medium reduced to 66%(for IL-6 and MCP-1)and 56%(for IL-8) of the levels without zeaxanthin. This was accompanied by reduced p38 and JNK protein phosphorylation. Pretreatment of zeaxanthin also reduced intracellular MDA content caused by H2 O2 stimulation from 0.86 μmol/L to 0.52 μmol/L(P=0.02) in limbal epithelial cells and from 0.96 μmol/L to 0.56 μmol/L in conjunctival epithelial cells(P=0.03). However, zeaxanthin did nothave significant effect on H2 O2-induced cell death in limbal or conjunctival epithelial ***: Zeaxanthin is an effective reagent in reducing the detrimental effect of UV-radiation and oxidative stress on ocular surface epithelial cells.

关键词： zeaxanthin UV-radiation oxidative stress malondialdehyde limbal epithelial cells conjunctival epithelial cells

Early diagnostic value of liver stiffness measurement in hepatic sinusoidal obstruction syndrome induced by hematopoietic stem cell transplantation

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World Journal of Clinical Cases 2022年第26期10卷 9241-9253页

作者： You-Wen Tan Yi-chun shi Department of Hepatology The Third Hospital of Zhenjiang Affiliated Jiangsu UniversityZhenjiang 212003Jiangsu ProvinceChina

Hematopoietic stem cell transplantation(HSCT)-sinusoidal obstruction syndrome(SOS),also known as veno-occlusive disease,is a clinical syndrome characterized by symptoms,such as right upper quadrant pain,jaundice,fluid retention,and hepatomegaly,and is caused by pre-treatment-related hepatotoxicity during the early stages after *** diagnosis of HSCT-SOS is based on the revised Seattle or Baltimore *** revised standard by the European Society for Bone Marrow Transplantation in 2016 has good practicability and can be used in combination with these two *** studies have shown the value of liver stiffness measurement(LSM)in the early diagnosis of *** studies investigated LSM specificity and sensitivity for the early diagnosis of *** can distinguish SOS from other post-HSCT complications,enabling a clear differential *** has been shown that median LSM of patients with SOS is significantly higher than that of patients with other treatment-related liver complications(e.g.,acute cholecystitis,cholangitis,antifungal drug-related liver injury,liver graft-versus-host disease,isolated liver biochemical changes,and fulminant Epstein Barr virus related hepatitis reactivation).Therefore,the above data confirmed the utility of LSM and strongly suggested that LSM improves the positive predictive value of the SOS diagnostic clinical score after allogeneic *** diagnosis of SOS is beneficial in preventing severe HSCT complications.

关键词： Hematopoietic stem cell transplantation Sinusoidal obstruction syndrome Liver stiffness measurement Stem cell

Long-term hemispheric variation of the flare index

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Research in Astronomy and Astrophysics 2013年第3期13卷 343-350页

作者： Song Feng Lin-Hua Deng shi-chun Xu Computer Technology Application Key Lab of Yunnan Province and Faculty of Information Engineering and Automation Kunming University of Science and Technology Key Laboratory of Solar Activity National Astronomical Observatories Chinese Academy of Sciences National Astronomical Observatories / Yunnan Astronomical Observatory Chinese Academy of Sciences University of Chinese Academy of Sciences Kunming Institute of Physics

The long-term hemispheric variation of the flare index is investigated. It is found that, （1） the phase difference of the flare index between the northern and southern hemispheres is about 6-7 months, which is near the time delay between flare activity and sunspot activity; （2） both the dominant and phase-leading hemisphere of the flare index is the northern hemisphere in the considered time interval, implying that the hemispheric asynchrony of solar activity has a close connection with the N-S asymmetry of solar activity.

关键词： Sun: activity -- Sun: flares -- methods: data analysis