Poov siv los npias npias. Feem ntau yog ntau yam sib txawv ntawm Sac-charomyces cerevisiae. E · C · Hansen (1883) pib cais tawm thiab sau cov poov xab thiab siv nws los npias npias. Cov poov xab nram qab no ntawm "Carlsberg" Lub Chaw Tshawb Fawb Brewing hauv Denmark muaj npe nrov. Poov xab lwm hom npias muaj xws li "Saaz" hom poov xab hauv qab los ntawm lub teb chaws Yelemees, thiab poov xab saum toj ntawm teb chaws Aas Kiv thiab Nyiv. Lub xovtooj ntawm morphology yog tib yam li lwm qhov sib xyaw ua ke cov poov xab, thiab nws yog ze li ntawm kheej kheej kheej, uas txawv ntawm cov poov xab tsiaj qus. Poov xab npum yog ib hom ua los saum toj kawg nkaus fermentation feem ntau siv hauv npias ntau lawm. Ntxiv nrog rau kev haus npias, dej cawv thiab lwm yam dej haus, nws tuaj yeem ua rau ncuav ncuav. Cov kab mob muaj cov vitamins thiab protein ntau hauv cov ntsiab lus thiab tuaj yeem siv ua noj, noj tshuaj thiab pub muaj poov xab. Cytochrome C, nucleic acid, glutathione, thrombin, coenzyme A thiab adenosine triphosphate tuaj yeem muab rho tawm ntawm nws. Hauv kev txiav txim siab microbiological ntawm cov vitamins, npias poov xab yog nquag siv los txiav txim siab biotin, pantothenic acid, thiamine, pyridoxine thiab inositol.
Lub colony ntawm brewer' s poov xab rau ntawm malt extract agar nruab nrab yog milky dawb, ci, tiaj, nrog ntug zoo. Asexual kev yug me nyuam yog yeej los ntawm kev nce qib. Nws tuaj yeem ua kom muaj kua qabzib, maltose, galactose thiab sucrose, tab sis tsis lactose thiab melibiose.
Raws li qhov sib piv ntawm lub xovtooj ntev mus rau qhov dav, npias poov xab tuaj yeem muab faib ua peb pawg. Cov hlwb ntawm thawj pab pawg feem ntau puag ncig, oval lossis oval (cell ntev / qhov dav< 2),="" thiab="" feem="" ntau="" yog="" siv="" rau="" kev="" haus="" cawv,="" ua="" kom="" muaj="" cawv="" thiab="" ua="" khob="" cij="" ntau="" lawm.="" cov="" duab="" ntawm="" lub="" xov="" tooj="" ntawm="" cov="" pab="" pawg="" thib="" ob="" feem="" ntau="" yog="" oval="" thiab="" ntev="" oval,="" thiab="" tseem="" muaj="" cov="" hloov="" puag="" ncig="" lossis="" luv="" qe="" ov="" (ntawm="" tes="" ntev="" qhov="" dav="" ≈="" 2).="" cov="" poov="" no="" tsuas="" yog="" siv="" rau="" cawv="" thiab="" kua="" txiv="" txiv="" ntoo="" cawv,="" tab="" sis="" kuj="" yog="" npias,="" cawv="" thiab="" cov="" poov="" xab="" ntau="" lawm.="" cov="" hlwb="" ntawm="" cov="" pab="" pawg="" thib="" peb="" yog="" oblong="" (cell="" ntev="" qhov="" dav=""> 2). Cov poov xab no muaj peev xwm tiv cov ntshav siab osmotic thiab siab ntsev ntau, thiab tsim nyog rau kev tsim cov cawv los ntawm cov kab mob suab thaj.