The invention relates to a method for isolating a biomolecule. A liquid sample comprising the biomolecule is contacted with an electrically conductive surface. The surface carries a chemical modification facilitating retention of said biomolecule, or an electrical retention potential is applied to said surface. The biomolecule is released by applying a voltage to the surface. The invention further relates to a device comprising a chamber configured for receiving a liquid sample, wherein a first surface of said chamber is a working electrode formed by a high-surface, electrochemically active material embedded in a non-electrically conductive polymer matrix. The device further comprises a counter electrode and connections to a voltage source. The invention further relates to a device and method for loading an extracellular vesicle with cargo molecules.

The invention relates to a method for isolating a biomolecule. A liquid sample comprising the biomolecule is contacted with an electrically conductive surface. The surface carries a chemical modification facilitating retention of said biomolecule, or an electrical retention potential is applied to said surface. The biomolecule is released by applying a voltage to the surface. The invention further relates to a device comprising a chamber configured for receiving a liquid sample, wherein a first surface of said chamber is a working electrode formed by a high-surface, electrochemically active material embedded in a non-electrically conductive polymer matrix. The device further comprises a counter electrode and connections to a voltage source. The invention further relates to a device and method for loading an extracellular vesicle with cargo molecules.

A eukaryotic expression vector capable of displaying a multi-chain polypeptide on the surface of a host cell is provided, such that the biological activity of the multi-chain polypeptide is exhibited at the surface of the host cell. Such a vector allows for the display of complex biologically active polypeptides, e.g., biologically active multi-chain polypeptides such as immunoglobulin Fab fragments. The present invention describes and enables the successful display of a multi-chain polypeptide on the surface of a eukaryotic host cell. Preferred vectors are described for expressing the chains of a multi-chain polypeptide in a host cell separately and independently (e.g., under separate vector control elements, and/or on separate expression vectors, thus forming a matched vector set). The use of such matched vector sets provides flexibility and versatility in the generation of eukaryotic display libraries, for example the ability to generate and to display multi-chain polypeptides by combining and recombining vectors that express variegations of the individual chains of a multi-chain polypeptide. Entire repertoires of novel chain combinations can be devised using such vector sets.

A eukaryotic expression vector capable of displaying a multi-chain polypeptide on the surface of a host cell is provided, such that the biological activity of the multi-chain polypeptide is exhibited at the surface of the host cell. Such a vector allows for the display of complex biologically active polypeptides, e.g., biologically active multi-chain polypeptides such as immunoglobulin Fab fragments. The present invention describes and enables the successful display of a multi-chain polypeptide on the surface of a eukaryotic host cell. Preferred vectors are described for expressing the chains of a multi-chain polypeptide in a host cell separately and independently (e.g., under separate vector control elements, and/or on separate expression vectors, thus forming a matched vector set). The use of such matched vector sets provides flexibility and versatility in the generation of eukaryotic display libraries, for example the ability to generate and to display multi-chain polypeptides by combining and recombining vectors that express variegations of the individual chains of a multi-chain polypeptide. Entire repertoires of novel chain combinations can be devised using such vector sets.

The present invention provides biomimetic sensor devices that utilize proteinssuch G-protein coupled receptorsand are useful in high-sensitivity analysis of analyte-containing samples. These sensors may be used to determine the presence or concentration of one or more analytes in a sample. The invention also includes methods of fabricating the devices and methods of using the devices to assay samples.

The present invention discloses an in vitro method for diagnosing a Leptospira infection in a biological sample of a subject, comprising a step of contacting said sample with bacterial cells of a serovar of the Leptospira fainei species, preferably bacterial cells of the Leptospira fainei serovar Hurstbridge, or an antigenic fraction of said bacterial cells. In a preferred embodiment, said Leptospira infection is not due to bacteria belonging to the serovar of the Leptospira fainei species used in the diagnostic method.

Methods and kits for measuring levels of von Willebrand factor function in a sample without using a platelet aggregation agonist, such as ristocetin, comprising recombinant glycoprotein Ib having at least two of a G233V, D235Y and M239V mutations and an agent to detect a complex between the recombinant glycoprotein Ib and von Willebrand factor.

Methods and kits for measuring levels of von Willebrand factor function in a sample without using a platelet aggregation agonist, such as ristocetin, comprising recombinant glycoprotein Ib having at least two of a G233V, D235Y and M239V mutations and an agent to detect a complex between the recombinant glycoprotein Ib and von Willebrand factor.

Methods and kits for measuring levels of von Willebrand factor function in a sample without using a platelet aggregation agonist, such as ristocetin, comprising recombinant glycoprotein Ib having a combination of G233V, D235Y and M239V mutations and an agent to detect a complex between the recombinant glycoprotein Ib and von Willebrand factor.

Methods and kits for measuring levels of von Willebrand factor function in a sample without using a platelet aggregation agonist, such as ristocetin, comprising recombinant glycoprotein Ib having a combination of G233V, D235Y and M239V mutations and an agent to detect a complex between the recombinant glycoprotein Ib and von Willebrand factor.