Abstract: Provided is a method and device for separating a cell from a sample. The method comprises contacting a nonplanar solid substrate with a cell-containing sample in a liquid medium having a pH of 3.0 to 6.0.

Abstract: A method of separating microorganisms from a sample includes introducing a sample into an apparatus which controls a concentration of at least one salt, the apparatus includes a reaction chamber defined between a cation exchange membrane and an anion exchange membrane, a first electrode chamber defined between the anion exchange membrane and a first electrode, the first electrode chamber containing a first ion exchange medium, a second electrode chamber defined between the cation exchange membrane and a second electrode, the second electrode chamber containing a second ion exchange medium, applying a voltage between the first electrode and the second electrode to electrodialyze the sample in the reaction chamber and reduce the concentration of the at least one salt in the sample and allowing the sample having the reduced concentration of the at least one salt to contact a microorganism capturing means.

Abstract: Provided is a method of amplifying nucleic acid from a comprising: contacting a cell-containing sample with a nonplanar solid substrate in a liquid medium having a pH range of 3.0-6.0 to attach the cell to the solid substrate; washing the nonplanar solid substrate to remove materials that are not attached thereto; and performing PCR using the nucleic acid from the cell attached to the nonplanar solid substrate as a template sample to amplify nucleic acid from the cell, wherein the contacting, washing and PCR processes are performed in a single vessel.

Abstract: A method of amplifying nucleic acid from blood, the method including performing an electrodialysis on a blood sample to reduce the ionic strength of the sample, and performing a Polymerase Chain Reaction (“PCR”) using the blood sample on which the electrodialysis is performed as a template.

Abstract: A microfluidic device for concentrating a sample including cells or viruses and lysing the cells or viruses, the device including an anode chamber including an anode electrode, a cathode chamber including a cathode electrode and an ion exchange membrane separating the anode chamber and the cathode chamber. The cathode chamber includes a solid support therein. A method of producing the microfluidic device and a method of concentrating a sample including cells or viruses and lysing the cells or viruses therein using the microfluidic device.

Abstract: Disclosed herein are a method of fabricating a microfluidic device, and a microfluidic device fabricated by the method. The method includes coating an adhesive material on a first substrate having a fluid port to form an adhesive layer thereon, arranging a second substrate having a microstructure formed therein with the surface of the first substrate on which the adhesive layer is formed, such that the fluid port and the microstructure correspond to each other, and heating the substrates at about 50 to about 180 degrees Celsius to bind the first substrate to the second substrate.

Abstract: Disclosed herein is a method of releasing a photoresist film from a substrate, which includes forming a self-assembled monolayer (SAM) on a substrate; coating the SAM with a photoresist film; and rinsing the substrate with an alcohol or an acid. According to the photoresist film releasing method, a photoresist film can be easily released from a substrate without damage after patterning. A method of bonding a released photoresist film with a substrate includes arraying a second substrate and the photoresist film released from a first substrate, and baking the second substrate. According to the bonding method, the photoresist film can be perfectly bonded with a second substrate without generating a crevice even though an additional adhesive is not used.

Abstract: Provided is a method for immobilizing a biomolecule on a solid substrate. The method includes coating the solid substrate with silane anhydride to introduce an anhydride functional group onto a surface of the solid substrate; obtaining a carboxyl group from the anhydride functional group by hydrolysis; reacting the carboxyl group with carbodiimide and succinimide to activate the carboxyl group; and contacting the biomolecule with the solid substrate having the activated carboxyl group on its surface to immobilize the biomolecule on the solid substrate.

Abstract: A microfluidic device includes; an ion exchange membrane, an anode chamber one side of which contacts a surface of the ion exchange membrane, wherein the anode chamber further includes a ladder-shaped anode and an anode support part, and a cathode chamber, one side of which contacts a surface of the ion exchange membrane opposite the anode chamber, wherein the cathode chamber further comprises a cathode, wherein the ladder-shaped anode is formed on a first surface of the anode support part, openings are formed in the anode support part which conform to the shape of the ladder-shaped anode, and a second surface of the anode support part which opposes the first surface of the anode contacts and supports the ion exchange membrane.

Abstract: A method of forming a photoresist pattern, capable of improving an adhesion property of the photoresist pattern formed on a substrate, includes forming a photocatalytic layer on a substrate, forming a negative-type photoresist layer on the photocatalytic layer, exposing the photoresist layer to ultraviolet rays, heat-treating the photoresist layer, and developing the photoresist layer to form the photoresist pattern. Thereby, applying the photocatalytic layer formed on various substrates, the photoresist pattern has excellent adhesion property and is capable of ensuring a high aspect ratio.

Abstract: Provided is a method for immobilizing a biomolecule on a solid substrate. The method includes coating the solid substrate with silane anhydride to introduce an anhydride functional group onto a surface of the solid substrate; obtaining a carboxyl group from the anhydride functional group by hydrolysis; reacting the carboxyl group with carbodiimide and succinimide to activate the carboxyl group; and contacting the biomolecule with the solid substrate having the activated carboxyl group on its surface to immobilize the biomolecule on the solid substrate.

Abstract: A method of manufacturing a DNA (deoxyribonucleic acid) chip is provided. The DNA chip has a plurality of transistors formed on a substrate and an organic layer and a DNA probe sequentially stacked on a gate of the transistor. The method includes forming an inter-layer insulation layer on the substrate to cover the transistors, planarizing the inter-layer insulation layer, forming at least two contact holes exposing gate electrodes of the transistors in the inter-layer insulation layer, selectively forming organic layers on the exposed gate electrodes, attaching a first DFR (dry film resist) layer to the upper surface of the inter-layer insulation layer to cover the contact holes, removing a portion of the first DFR layer covering a first contact hole among the contact holes, attaching a first DNA probe to the organic layers in the first contact hole, and removing a remaining portion of the first DFR layer.

Abstract: A method of separating cells or viruses from a mixture using phase separation is provided. The method includes: suspending a sample containing cells or viruses in a kosmotropic salt solution having a pH of 3-6; aggregating the cells or viruses by adding a cationic polymer to the suspension; adhering the cells or viruses to a solid substrate with the aid of phase separation of polymer by placing the suspension in contact with the solid substrate; and separating the solid substrate on which the cells or viruses are adhered from the suspension. Accordingly, it is possible to separate a high concentration of cells, even when using a flow control system. In addition, the method can be conveniently applied to lab-on-a-chip technology.

Abstract: Provided is a pH dependent ion exchange material. The pH dependent ion exchange material has at least one monomer selected from the group consisting of M0, M1, M2 and M3 represented by the following formulae, provided that at least one monomer having A and at least one monomer having B are contained therein, the pH dependent ion exchange material having a degree of polymerization of 2-30,000. wherein A is a group —X(CH2)nY, wherein n is an integer from 1 to 10, X is a functional group which can react with an activated ester, and Y is a primary, secondary, tertiary amine or a nitrogen-containing aromatic heterocyclic base, B is a group —X?(CH2)nY?, wherein n is an integer from 1 to 10, X? is a functional group which can react with an activated ester, and Y? is an acid generating group having a pKa value of 4 or less, and R3 is an alkyl group having 1 to 10 carbon atoms.

Abstract: A method of separating cells or viruses using alumina is provided. The method includes: contacting a solution containing cells or viruses with alumina; and washing the alumina having cells or viruses bound thereto. According to the method, the separation efficiency of cells or viruses can be increased, the detection limit for cells or viruses can be improved, and a sample can be rapidly prepared.

Abstract: Provided is a method of separating cells using a hydrophobic solid support. The method comprises contacting a solution containing cells with a hydrophobic solid support having a water contact angle between 70 and 90 degrees. By allowing cells to be adsorbed to the hydrophobic solid substrate, the cells can be separated. Thus, the cell separation efficiency can be rapidly and simply increased.

Abstract: Provided are a method of isolating a nucleic acid from a sample and a solid material for isolating the nucleic acid which can be used for the above method. The method includes contacting the sample with a bifunctional material containing an amino group and a carboxyl group at a first pH to bind the nucleic acid to the bifunctional material, the bifunctional material being positively charged at the first pH; and releasing the nucleic acid at a second pH which is higher than the first pH.

Abstract: Provided is a method of controlling the pH of a solution using electrolysis in a microfluidic device comprising an electrolysis device including an anode chamber, a cathode chamber, and a partition membrane between the anode chamber and the cathode chamber, wherein the anode chamber includes an inlet and an outlet through which an anode chamber solution enters and is discharged from the anode chamber, respectively, and an electrode, and the cathode chamber includes an inlet and an outlet through which a cathode chamber solution enters and is discharged from the cathode chamber, respectively, and an electrode.

Abstract: Provided are nucleic acid isolation unit and method. The method includes immobilizing an aromatic compound-containing nucleic acid intercalator on a solid support; contacting a first buffer solution containing a nucleic acid sample to be purified to the intercalator immobilized on the solid support to bind the intercalator with nucleic acids contained in the nucleic acid sample; cleaning the resultant structure where the nucleic acids are bound to the intercalator immobilized on the solid support; and eluting the nucleic acids with a second buffer solution.

Abstract: A method of isolating nucleic acid from a sample containing nucleic acid is provided. The method includes contacting the sample with a bifunctional material that contains an amino group and a carboxyl group and is positively charged at a first pH to allow binding of the nucleic acid to the bifunctional material; and extracting the nucleic acid at a second pH higher than the first pH from the complex.