The passage of Treponema pallidum through commercially available Millipore membrane filters of various pore sizes was examined. No microscopically detectable organisms passed through a filter with a pore diameter of 0.22 mum. As pore size was increased, progressively more organisms passed through. Motile organisms passed through filters to a greater extent than nonmotile ones; however, 22% of t...

There is no published report regarding Iran's aquatic hyphomycetes. In an attempt to identify species of aquatic hyphomycetes in a river in central Iran (Zayande-Roud River), conidial frequency and distribution were determined by filtration. Water samples were collected monthly from two stations 55 km apart and filtered through millipore filters (5 um pore sizes). This was carried out for seven...

Introduction In the underlying study we evaluated different single-use filtration systems for cell separation and harvest clarification in 1,000 L scale. A screening of different depth filters was carried out with various single-use filters from Pall, Cuno (3M), Millipore and Sartorius Stedim. In total, we included 85 depth filtrations in the screening. Out of that, two single-use filtration sy...

there is no published report regarding iran's aquatic hyphomycetes. in an attempt to identify species of aquatic hyphomycetes in a river in central iran (zayande-roud river), conidial frequency and distribution were determined by filtration. water samples were collected monthly from two stations 55 km apart and filtered through millipore filters (5 um pore sizes). this was carried out for ...

Colicin E4 was produced in very large amounts when Escherichia coli K12 strain W3110 pColE4-CT9 was grown in the presence of 0.5 microgram mitomycin C ml-1. The colicin was discharged from the producing cells when they lysed and was then degraded by a protease located on the surface of the producing cells. Colicins and proteolytic fragments derived from them could be concentrated from spent cul...