The problem addressed by the present invention is to provide a separation membrane with superior permeation performance and separation performance and having few occurrences of defects. The present invention relates to a separation membrane wherein: the separation membrane has a layer (I) with a thickness of 0.5-100 m; letting, in a cross-section in the direction of thickness of the layer (I), region a be a region with a depth of 50-150 nm from a surface (surface A), region b a region with a depth of 50-150 nm from the other surface (surface B), and region c a region with a thickness of 100 nm where the depth from both surfaces is the same, the average pore diameter Pa for region a and the average pore diameter Pb for region b are both 0.3-3.0 nm and the average pore diameter Pc for region c is 3.0 nm or less; and the percentage of open area Ha for region a, the percentage of open area Hb for region b, and the percentage of open area Hc for region c satisfy the following equations. 2Hc<Ha 2Hc<Hb

The problem addressed by the present invention is to provide a separation membrane with superior permeation performance and separation performance and having few occurrences of defects. The present invention relates to a separation membrane wherein: the separation membrane has a layer (I) with a thickness of 0.5-100 m; letting, in a cross-section in the direction of thickness of the layer (I), region a be a region with a depth of 50-150 nm from a surface (surface A), region b a region with a depth of 50-150 nm from the other surface (surface B), and region c a region with a thickness of 100 nm where the depth from both surfaces is the same, the average pore diameter Pa for region a and the average pore diameter Pb for region b are both 0.3-3.0 nm and the average pore diameter Pc for region c is 3.0 nm or less; and the percentage of open area Ha for region a, the percentage of open area Hb for region b, and the percentage of open area Hc for region c satisfy the following equations. 2Hc<Ha 2Hc<Hb

The present invention provides a porous hollow fiber membrane suitable for the removal of minute substances, e.g., viruses, contained in a liquid. The present invention relates to a porous hollow fiber membrane which is provided with a separation-functioning layer containing a fluororesin, has a gas diffusion amount of 0.5 to 5.0 mL/m.sup.2/hr as measured in a diffusion test, and also has foaming points at a density of 0.005 to 0.2 point/cm.sup.2 as measured in a foaming test under the immersion in 2-propanol.

The invention relates to a fluidic purifying device designed to clean a fluid of at least one pollutant, comprising a fluidic purification network, characterized in that the fluidic purification network comprises a plurality of microfluidic channels, each microfluidic channel being defined by one or more fluidttight walls, each microfluidic channel comprising at least one zone on the interior surface of said microfluidic channel that exhibits at least one autonomous purifying agent and each microfluidic channel exhibiting, in such a zone, a height less than 60 m in a direction normal to the main direction of flow of the fluid, the purifying agent or agents, and the sizing of said zones, being configured in such a way as to allow at least 10% of the pollutants to be captured and/or broken down by said zones, for at least one flow rate of the fluid that is to be purified.

The invention relates to a fluidic purifying device designed to clean a fluid of at least one pollutant, comprising a fluidic purification network, characterized in that the fluidic purification network comprises a plurality of microfluidic channels, each microfluidic channel being defined by one or more fluidttight walls, each microfluidic channel comprising at least one zone on the interior surface of said microfluidic channel that exhibits at least one autonomous purifying agent and each microfluidic channel exhibiting, in such a zone, a height less than 60 m in a direction normal to the main direction of flow of the fluid, the purifying agent or agents, and the sizing of said zones, being configured in such a way as to allow at least 10% of the pollutants to be captured and/or broken down by said zones, for at least one flow rate of the fluid that is to be purified.

The present invention relates to method for producing and purifying RNA comprising the steps of providing DNA encoding the RNA; transcription of the DNA into RNA; and conditioning and/or purifying of the solution comprising transcribed RNA by one or more steps of tangential flow filtration (TFF).

The present invention relates to method for producing and purifying RNA comprising the steps of providing DNA encoding the RNA; transcription of the DNA into RNA; and conditioning and/or purifying of the solution comprising transcribed RNA by one or more steps of tangential flow filtration (TFF).

The problem to be solved by the present invention is to provide a separation film mainly comprising a cellulose-based resin having high permeability. The present invention pertains to a separation film containing a cellulose ester, wherein the separation film is provided with a bicontinuous structure comprising voids and phases containing the cellulose ester, and the width of the voids is 1 to 200 nm inclusive.

The problem to be solved by the present invention is to provide a separation film mainly comprising a cellulose-based resin having high permeability. The present invention pertains to a separation film containing a cellulose ester, wherein the separation film is provided with a bicontinuous structure comprising voids and phases containing the cellulose ester, and the width of the voids is 1 to 200 nm inclusive.

A polyolefin microporous membrane on which a porous layer has little fluctuations in thickness and a separator for batteries can adapt to the increase in capacity of a battery. A polyolefin microporous membrane having a range of fluctuation in a F25 value in the width direction of 1 MPa or less, a thickness of 3 m or more and less than 7 m and a width of 100 mm or more (wherein the term F25 value refers to a value produced by dividing the value of a load applied to a test specimen upon the stretching of the test specimen at a stretching ratio of 25% using a tension tester by the value of a cross-sectional area of the test specimen).