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A new sesquiterpene from Caragana intermediia

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Chinese Chemical Letters 2007年第11期18卷 1379-1382页

作者： Zhi hua Sun chang qi hu Jin Yi Wang School of Pharmacy Fudan University Shanghai 200032 China College of Science Northwest A＆F University Yangling 712100 China

A new alloaromadendrane-type sesquiterpene, （-）-alloaromadendrane-3β,9β-diol （1）, has been isolated from the aerial part of Caragana intermediia. The structure of （-）-alloaromadendrane-3β,9β-diol （1） was established by spectroscopic methods, including X-ray analysis that provided its relative stereochemistry. Bioassay showed that （-）-alloaromadendrane-3β,9β-diol （1） possesses anti-pyricularia oryzae P-2b activity with MIC value of 10 μg/m-L.

关键词： Caragana intermediia Leguminosae Sesquitetpene (-)-Alloaromadendrane-3β,9β-diol

Preparation of Nicotinic Acid from Oxidation of 3-Picoline with Oxygen Under Catalysis of T(o-Cl)PPMn

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Chemical Research in Chinese Universities 2008年第6期24卷 743-746页

作者： BAI Jin-quan WANG qi-chang hu Yun GUO Feng-yan Department of Chemistry and Chemical Engineering College of Environment and Energy Engineering Beijing University of Technology Beijing 100022 P. R. China

The oxidation of 3-picoline to nicotinic acid took place efficiently in an ethanol solution with 02 as the oxidant under the catalysis of T（o-Cl）PPMn at 40--150 ℃ and 0.5--3.0 MPa oxygen pressure. The influences of temperature, oxygen pressure, reaction time, concentration of 3-picoline, concentration of sodium hydroxide, and concentration of T（o-Cl）PPMn catalyst, etc. on the production of nicotinic acid were investigated. The results show that T（o-Cl）PPMn presented excellent catalytic activity in the oxidation Of 3-pieoiine to nicotinic acid and the yield of nicotinic acid varied greatly with the reaction temperature, oxygen pressure, T（o-Cl）PPMn concentration, etc.

关键词： Nicotinic acid 3-Picoline Metalloporphyrin Oxidation

Fusarielin E,a new antifungal antibiotic from Fusarium sp.

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Chinese Chemical Letters 2007年第8期18卷 954-956页

作者： Yue Gai Ling Ling Zhao chang qi hu hui Ping Zhang Department of Chemistry of Natural Drugs School of Pharmacy Fudan University Shanghai 200032 China

A new antifungal antibiotic, fusarielin E, was isolated from the marine-derived fungus Fusarium sp. Its structure was established on the basis of various NMR spectroscopic analyses and HR-FAB-MS. Fusarielin E displaye... 详细信息

关键词： Fusarielin E Marine Fungus Pyricularia oryzae

A new tetrastilbene from Caragana sinica

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Chinese Chemical Letters 2008年第6期19卷 711-715页

作者： Ke Jun Cheng Da You Ma Guo Xun Yang chang qi hu Department of Chemistry of Natural Products Fudan University Shanghai 200032 China

A new tetrastilbene named carasinol D （1） was isolated from the roots of Caragana sinica. Its structure was elucidated by spectroscopic analysis. Compound 1 was obtained from carasinol B （2） by an acid-catalyzed c... 详细信息

关键词： Caragana sinica Stilbenoids Carasinol D Carasinol B

A New Stilbene Tetramer from Caragana rosea

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Chinese Chemical Letters 2003年第10期14卷 1048-1050页

作者： Guo Xun YANG, chang qi hu School of Pharmacy, Fudan University, Shanghai 200032 School of Pharmacy Fudan University

Cararosinol A, a new stilbene tetramer, was isolated from Caragana rosea. Its structure has been established on the basis of spectroscopic evidence.

关键词： Caragana rosea Leguminase stilbene tetramer.

5′-Hydroxyzearalenol,a new β-resorcylic macrolide from Fusarium sp. 05ABR26

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Chinese Chemical Letters 2008年第9期19卷 1089-1092页

作者： Ling Ling Zhao Yue Gai Hisayoshi Kobayashi chang qi hu hui Ping Zhang Department of Natural Products Chemistry School of Pharmacy Fudan University Shanghai 200032 China Institute of Molecular and Cellular Biosciences The University of Tokyo Tokyo 113-0032 Japan

A new β-resorcylic macrolide, 5＇-hydroxyzearalenol （1）, was isolated from the culture broth of a marine-derived fungus Fusarium sp. 05ABR26. Three known compounds, zearalenone （2）, 8＇-hydroxyzearalenone （3） and zearalenol （4） were also isolated. The structure and relative stereochemistry of 1 were elucidated on the basis of spectroscopic data and single-crystal X-ray diffraction data. Compound 2 displayed potent inhibitory activity against Pyricularia oryzae with a MIC value of 6.25 μg/mL, while compound 3 was much less active; however, 1 and 4 showed no obvious activity.

关键词： 5'-Hydroxyzearalenol Fusarium sp. X-ray diffraction data Pyricularia oryzae

Leiocyclocin A and B, Two Cyclopeptides from Goniothalamus leiocarpus

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Chinese Chemical Letters 2001年第7期12卷 607-610页

作者： qing MU Rong Wei TENG Chao Ming LI De Zu WANG Yu WU Han Dong SUN chang qi hu Phytochemistry Laboratory Kunming Institute of BotanyChinese Acadmy of SciencesKunming 650204 School of Pharmacy Fudan UniversityShanghai 200032

Two new cyclopeptides, leiocyclocin A (1); B (2), were isolated from the seeds of Goniothalanus leiocarpus. Their structures were elucidated by means of spectral and chemical methods.

关键词： Annonaceae Goniothalamus G. Leiocarpus cyclopeptide leiocyclocin A and B

Greedy Lattice Paths with General Weights

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Acta Mathematica Sinica,English Series 2024年第9期40卷 2213-2222页

作者： Yin Shan chang An qi ZHENG College of Mathematics Sichuan UniversityChengdu 610065P.R.China

Let{X_(v):v∈Z^(d)}be *** *** S(π)=Σ_(v∈π)X_(v)be the weight of a self-avoiding lattice pathπ.Let M_(n)=max{S(π):πhas length n and starts from the origin}.We are interested in the asymptotics of Mn as n→∞.This model is closely related to the first passage percolation when the weights{X_(v):v∈Z^(d)}are non-positive and it is closely related to the last passage percolation when the weights{X_(v):v∈Z^(d)}are *** general weights,this model could be viewed as an interpolation between first passage models and last passage ***,this model is also closely related to a variant of the position of right-most particles of branching random *** the two assumptions that∃α>0,E(X_(0)^(+))^(d)(log^(+)X_(0)^(+))^(d+α)0,E(X_(0)^(+))^(d)(log^(+)X_(0)^(+))^(d+α)<+∞and that E[(X_(0)^(−))^(4)]<+∞,we prove that M_(n)/n converges to the same constant M almost surely as n tends to infinity.

关键词： Last passage percolation first passage percolation greedy lattice path

A Probabilistic Approach for Predicting Vessel Motion

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IEEE/CAA Journal of Automatica Sinica 2024年第8期11卷 1877-1879页

作者： qi hu Jingyi Liu Zongyu Zuo 7th Research Division Beihang University(BUAA)Beijing 100191China 54th Research Institute of China Electronics Technology Group Corporation Shijiazhuang 050081China

Dear Editor,This letter addresses the challenge of forecasting the motion of real-world vessels over an extended period with a limited amount of available *** employing stochastic differential equation(SDE)modeling,we integrate both deterministic and stochastic components of the available ***,we establish a recursive prediction methodology based on Bayes’rule to update the model state when new measurements are ***,we develop a stochastic model tailored specifically to vessel dynamics and introduce an approximation method to tackle computational ***,we present an application example and conduct a comparative experiment to validate the effectiveness and superiority of the proposed method.

关键词： method stochastic letter