学科分类
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169 个结果
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  • 简介:人的社会的动力学现在在由城市创造的人工的环境的上下文正在学习。在这个工作,作者描述一些在复杂性科学过去常学习城市的系统的形式化方法。作者讨论一些在现在的科学研究注意一些最深的争吵的城市的重要量的途径。当学习这类合作社会环境时,作者将强调一条transdisciplinary途径的重要性。

  • 标签: 城市 复杂性 环境
  • 简介:Marineecologicalnicheshaverecentlybeendescribedas"particularlypromising"sourcesforsearchofnewantimicrobialstocombatantibiotic-resistantstrainsofpathogenicmicroorganisms.Marineorganismsareexcellentsourcesformanyindustrialproducts,buttheyarepartlyexplored.Over30000compoundshavebeenisolatedfrommarinesources.Bacteria,fungi,andcyanobacteriaobtainedfromvariousmarinesourcessecretseveralindustriallyusefulbioactivecompounds,possessingantibacterial,antifungal,andantimycobacterialactivities.Sustainablecultivationmethodsforpromisingmarineorganismsandbiotechnologicalprocessesforselectedcompoundscanbedeveloped,alongwiththeestablishmentofbiosensorsformonitoringthetargetcompounds.Thesemisyntheticmodificationsofmarine-basedbioactivecompoundsproducetheirnewderivatives,structuralanalogsandmimeticsthatcouldserveasnovelleadcompoundsagainstresistantpathogens.Thepresentreviewfocusesonpromisingantimicrobialcompoundsisolatedfrommarinemicrobesfrom1991-2013.

  • 标签: Antibacterial metabolites Antifungal metabolites Marine microbes
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  • 简介:Europeisnowfacingadifficulttime,withasluggisheconomy,refugeecrisis,frequentterroristattacks,plusBrexit.Whatalotofpeopleviewedasarichandsafeparadisehasnowturnedouttobesomethingelse.Althoughthedebtcrisisiscurbedatthemoment,economicproblemsremainandwillgiverisetomorecrises.Therefore,Europe’scrisesarefarfromover.Inasense,theyarejustbeginning.

  • 标签: 欧洲 经济问题 恐怖袭击 债务
  • 简介:Thisstudyisthefirsttoreporttheradiocarbonages,mineralogical,morphological,geochemicalandstableisotopecompositionsofcalcretesfromNeogenesedimentsaroundlakesEymirandMoganintheG?lba??BasinofCentralAnatolia.MorphologicallydifferentformsofcalcretesintheG?lba??Basinincludepowdery,nodular,fractureinfill,laminarandhardpantypes.Calciteisthedominantmineralofcalcretecompositions;thediagnosticfeaturesofdessicationcracks,randomfractures,MnOliningsanddensespariticinfillingsareobserved.Chemicalanalysesshowaridconditionswithmeanannualprecipitationof<50mm.δ13Ccompositionsofthecalcretesrangefrom-6.77‰to-9.32‰PDB,typicalformostpedogeniccalcretes,reflectingthedevelopmentunderseasonallyaridclimatesandC3-dominatedvegetationcover.δ18Ovaluesarebetween-5.57‰and-7.80‰PDB,indicatingtheformationfrommeteoricwaterinavadosezoneenvironment.TheresultssuggestthattheMiddlePleistocenewasariderandwarmer,favouringtheformationofpalygorskiteinassociationwiththedifferentformsofcalcreteoccurrences,whereastheLatePleistocenewasdryerandcooler,supportingthedevelopmentofcalcretes.

  • 标签: 钙质结核 晚更新世 盆地 土耳其 第四纪 同位素组成