mycoplasma and ureaplasma species are the most serious contaminants of cell cultures and this remains one of the major problem encountered in biological research using cell cultures. the aim of this study was to investigate the rate of mycoplasma and a total of 100 different cell culture specimens including, r228, hela, vero, mdck, l20, rd and hep2 were collected. then the specimens were invest...

objectives the aim of this study was to assess soils of khorramabad metropolis in order to establish the concentration of lead and develop a contamination factor map. materials and methods soil samples were collected from 25 different urban parks in khorramabad, iran. the mean pb contents in the urban topsoil samples were compared with mean concentrations for other cities around the world. a sp...

Funding information National Science Foundation, Grant/Award Number: DMS-1620058 and DMS-1619892; Air Force Office of Scientific Research, USAF, Grant/Award Number: FA9550-15-1-0257; Army Research Office, Grant/Award Number: W911NF-15-1-0517; GENCI (Grand Equipement National de Calcul Intensif) Summary We introduce a time stepping technique using the momentum as dependent variable to solve inco...

Abstract This paper presents evidence from both corpora and agent-based simulation for the effect of lectal contamination. By doing so, it shows how can be used as a complementary technique to corpus research in study language variation. Lectal contamination is an whereby words that are typical variety more often appear morphosyntactic variant same variety, even among use different variety. loo...