Generation of higher multiple circular DNA forms in bacteria.

Circular DNA forms of a bacterial sex factor.

Bacteria are known to possess extrachromosomal genetic elements that can be classified as plasmids or episomes. Bacterial plasmids are extrachromosomal genetic elements that exist solely in the autonomous state,1 while bacterial episomes are capable of existing either in an autonomous state or stably attached to the bacterial chromosome.2 Certain bacterial sex factors, or genetic elements that ...

Evidence for multiple forms of DNA polymerase in Hodgkin's disease.

disease can be distinguished from one another and from control human polymerases by their elution behavior upon diethylaminoethyl cellulose chromatography and Sephadex gel filtration, by the magnesium ion concentration for optimal activity, by the stimulatory or inhibitory effects upon enzymatic activity of monovalent cations, and by sensitivity of enzymatic activity to heparin inhibition. Thes...

Multiple forms of DNA polymerase in mouse myeloma.

FIVE DISTINCT FORMS OF DNA POLYMERASE (DEOXYNUCLEOSIDETRIPHOSPHATE: DNA deoxynucleotidyltransferase, EC 2.7.7.7) were separated from extracts of mouse myeloma MOPC-104E using a fractionation procedure based upon sequential ion-exchange column chromatography. The enzymes were characterized according to sedimentation behavior, subcellular localization, chromatographic behavior on hydroxyapatite c...

the survey of the virtual higher education in iran and the ways of its development and improvement

این پژوهش با هدف "بررسی وضعیت موجود آموزش عالی مجازی در ایران و راههای توسعه و ارتقای آن " و با روش توصیفی-تحلیلی و پیمایشی صورت پذیرفته است. بررسی اسنادو مدارک موجود در زمینه آموزش مجازی نشان داد تعداد دانشجویان و مقاطع تحصیلی و رشته محل های دوره های الکترونیکی چندان مطلوب نبوده و از نظر کیفی نیز وضعیت شاخص خدمات آموزشی اساتید و وضعیت شبکه اینترنت در محیط آموزش مجازی نامطلوب است.

On Secondary Colony Development in Bacteria and an Analogy with Tumour Production in Higher Forms