真菌的分类与致病性.ppt

**感染免疫功能低下患者最常见的菌种是：烟曲霉、黄典霉、黑曲霉、土曲霉、构巢曲霉等。尤其当建筑物建成各种粉层播散时，空气中含大量的曲霉分生孢子。**037.AspergillusfumigatusonCzapekdoxagarshowingtypicalblue-greensurfacepigmentationwithasuede-likesurfaceconsistingofadensefeltofconidiophores.**026.MicroscopicmorphologyofAspergillusfumigatusshowingtypicalcolumnar,uniseriateconidialheads.Conidiophoresareshort,smooth-walledandhaveconicalshapedterminalvesicles,whichsupportasinglerowofphialidesontheuppertwothirdsofthevesicle.Conidiaareproducedinbasipetalbasipetalsuccessionforminglongchains(slide038),however,duringpreparationofslidestheconidialchainsareusuallydisruptedgivingthemoretypicalmicroscopicappearanceseeninslide039.Conidiaareglobosetosubglobose,greenandrough-walledtoechinulate.**027.MicroscopicmorphologyofAspergillusfumigatusshowingtypicalcolumnar,uniseriateconidialheads.Conidiophoresareshort,smooth-walledandhaveconicalshapedterminalvesicles,whichsupportasinglerowofphialidesontheuppertwothirdsofthevesicle.Conidiaareproducedinbasipetalsuccessionforminglongchains(slide038),however,duringpreparationofslidestheconidialchainsareusuallydisruptedgivingthemoretypicalmicroscopicappearanceseeninslide039.Conidiaareglobosetosubglobose,greenandrough-walledtoechinulate.**042.AspergillusflavusonCzapekdoxagar.Coloniesaregranular,flat,oftenwithradialgrooves,yellowatfirstbutquicklybecomingbrighttodarkyellow-greenwithage.**043.MicroscopicmorphologyofAspergillusflavus.Conidialheadsaretypicallyradiate,latersplittingtoformloosecolumns,biseriatebuthavingsomeheadswithphialidesbornedirectlyonthevesicle.Conidiophoresarehyalineandcoarselyroughened,oftenmorenoticeablenearthevesicle.Conidiaareglobosetosubglobose,palegreenandconspicuouslyechinulate.Somestrainsproducebrownishscleroti