A New Triterpenoid Glycoside from Decaisnea Fargesii

Deculsnea./al..gesiiFranch.IsatraditionalChinesemedicinalplantwidely'distributedinChina.usedasananti-rheumaticandalltitussivedrugforalongtimeinChinesefolkmedicine'.Itsmethanolextractshowedantitunlouracidityif71)if)oagainstS:sl},HepaandEhrlichcellsanditsphytochemicalstudiesonsaponinshasreported'.Asacontinuationofthestudiesonthisplant,wepresentthespectralandchemicalevidenceofthestructureofanewdecaisosideF.Thedriedstems(2.23kg)werepercolated\vith95%EtOH.Afterremovalofthepercolatesb}evaporat…     

Erratum to "Aerosol pollution in China: Present and future impact on environment"

PARTICUOLOGY regrets that the above paper was mistakenly classified as a ‘Review’ rather than an ‘Invited paper’ when originally published in volume 7, issue 6, 426–431.     

Three New Coumarins from Micromelum integerrimum

Micromelum integerrimum (Rutaceae) is a shrub growing in Yunnan Province. Leaves and barks of this plant have been used for the treatment of dysentery, and arthritis1. Previous researches revealed that this plant contained coumarins2-8. Micromelin, the main chemical constituent of this plant, showed significant inhibition against leukaemia P-388 cell line (T/C 149% at 10 mg/kg) but was inactive in lower doses, and also showed significant activity (T/C 228% at 1.25 mg/kg) against Lewis lung…     

Nonlinear properties of quantum dot semiconductor optical amplifiers at 1.3 μm： errata

The authors regret that one of the coauthors was inadvertently omitted in the previous paper. E. Varene was a member of the Institut fur Festk6rperphysik at the Technische Universitat Berlin and contributed to the results on cross-phase modulation.     

Organic Polyvalent Iodinc Reagents-Promoted Coupling Reaction of 1-Alkynes

Sincetheearlyl980sinterestin0rganicpoIyvalentiodinec0mp0undshasexperiencedaresurgence'.Afewexamplesofhomo-couplingreacti0nsviathesec0mpoundshavebeenrep0rted-.Wef0undthatl-aIkyneswereeasytoc0upleinthepresenceofPhI(OAc)=orPhI(OH)OTs,catalyticCulandbase,t0aff0rdc0njugateddiynes.l,3-Diyneplaysanimportantr0leinstudiesofm0lecularrec0ngnition',innaturalpr0ducts',andinsynthesis.AlthoughEglintonreaction',Cadi0t-Chalkiewiczc0upling'andGlaserreaction5haveprovidedc0nvenientmeth0dst0synthesizeconjug…     

增强谱带轮廓分辨率的计算机方法

引言用计算机从数值上记录的物理数据中提出隐藏的信息目前是一很活跃的领域。在各种名目下例如图象增强、分辩率增强、灵敏度增强、匀边或退卷积,都使用计算机来揭示因较强信号的重叠而部分或完全弄模糊了的物理测量的组元信息。通常由人眼不能一览数据而测出它们。可能其中最引人注目的是影象的处理,著名的是来自卫星照像机的大地勘测象和有关雷达和声纳探针得到的图象,最近已有综论评述。     

Symmetry role on the preedge X—ray absorption fine structure at the metal K edge

The preedge features in a system with “even”symmetry,apart from quadrupolar transition contribution,are mainly dipolar in character,associated with the existence of unoccupied states made up of mixed cation-4p with higher-neighboring cation-3d orbitals,and reflect the density of states due to the medium-range order of the system.In “odd“symmetry materials these preedge features ate the result of a transition from the ls to a final density of states of p symmetry due to an unsymmetrical mixing of the ligand wave functions with the central cation 3d orbitals,similar to atetrahedral configuration.These results are validated for Fe as a photoabsorber by comparing XAS spectra of Fe2SiO4(fayalite) to ab initio full multiple scattering calculations at the fe K edge,but pertain to all systems containing sixfold-coordinated cations.     

Status of the GAUDI Event—Processing Framework

The GAuDI architecture and framework are designed to provide a comon infrastructure and environment for simulation,filtering,reconstruction and analysis applications.Initially developed for the LHCb experiment,GAUDI has been adopted and extended by the ATLAS experiment and adopted by several other experiments including GLAST and HARP.we describe the properties and concepts embodied by GAUDI and recent functionality additions and how the project has evolved from a product developed by a tightly-knit team in a single site,to a collaboration between multiple teams at geographically dispersed sites,based loosely on open source concepts.We describe the management infrastructure as well as how we accommodate experment -specific extensions and adaptations as well as an experiment-neutral kernel.