摘要:
A micro-machined frit is provided for use in a chromatography column, having a substrate with a thickness, and holes extending through the thickness and providing fluid communication through the substrate. A micro-machined flow distributor is provided for use in a chromatography column having a substrate, holes extending through the substrate, and channels in fluid communication with the holes. A micro-machined integrated frit and flow distributor device is also provided having a substrate with a thickness, holes extending through the thickness and providing fluid communication therethrough, and channels in fluid communication with at least one of the holes. A chromatography column is provided having a tube, an extraction medium contained therein, and a micro-machined frit positioned proximate an end of the tube. The column can include a micro-machined flow distributor positioned between the frit and the end of the tube.
摘要:
Provided are apparatuses and methods for introducing particles into a microdevice conduit. Also provided are microdevices containing a plurality of particles that occupy at least about 25 volume percent of a microconduit. In some instances, particles may controllably form a particle bridge in a bridging zone within a microdevice.
摘要:
The present invention relates to an optical detection cell for micro-fluidics. The detection cell provides a first layer, a detection cell layer contacting the first layer, a third layer contacting the detection cell layer, a micro-fluidic chip having a fluidic port and a detection channel defined through the detection cell and being in fluid communication with the fluidic port of the chip, the detection channel serving as a light path for receiving light for detecting a molecule. Methods of detecting molecules and making the detection cell are also disclosed.
摘要:
An ion source a first ionizer comprising: an electrospray needle comprising a tip; and a conduit disposed annularly about the needle and configured to pass an inert gas in proximity of the tip to nebulize a fluid emerging from the tip, the nebulized fluid comprising analytes and a mobile phase. The ion source comprises a capillary in tandem with the first ionizer and configured to receive the droplets; a heater configured to heat the capillary to a temperature at which mobile phase vaporizes; and a second ionizer in tandem with the capillary and configured to receive the vaporized mobile phase and the analytes. A method is also described.
摘要:
A behavioral targeting system determines user profiles from online activity. The system includes a plurality of models that define parameters for determining a user profile score. Event information, which comprises on-line activity of the user, is received at an entity. To generate a user profile score, a model is selected. The model comprises recency, intensity and frequency dimension parameters. The behavioral targeting system generates a user profile score for a target objective, such as brand advertising or direct response advertising. The parameters from the model are applied to generate the user profile score in a category. The behavioral targeting system has application for use in ad serving to on-line users.
摘要:
A behavioral targeting system determines user profiles from online activity. The system includes a plurality of models that define parameters for determining a user profile score. Event information, which comprises on-line activity of the user, is received at an entity. To generate a user profile score, a model is selected. The model comprises recency, intensity and frequency dimension parameters. The behavioral targeting system generates a user profile score for a target objective, such as brand advertising or direct response advertising. The parameters from the model are applied to generate the user profile score in a category. The behavioral targeting system has application for use in ad serving to on-line users.
摘要:
A system for controlling fluid flow in a microfluidic circuit located in a liquid chromatograph includes at least one microfluidic channel and a flexible membrane adjacent the at least one microfluidic channel, wherein when actuated, the flexible membrane deflects into the microfluidic channel, thus impeding fluid flow in the microfluidic channel.
摘要:
Fluidic separation devices and methods with reduced sample broadening are provided. A column is located downstream from a holding chamber, and a flow providing means provides fluid flow effective to convey a sample along a flow path that extends from the holding chamber into the separation column. The sample is typically focused in the flow path upstream from the separation column. Optionally, the invention may be employed with electrospray mass spectrometry and in microfluidic applications.
摘要:
Devices comprising a mechanism for selectively diverting a portion of a mobile phase flowing through a mobile-phase transporting conduit to a fluid-transporting conduit comprising a stationary phase for separating sample components are disclosed, as well as systems and methods for using the same.
摘要:
An electrospray device for a mass spectrometry system is described. The electrospray device comprises a body portion and a tip portion extending from the body portion. The tip portion comprises a polymeric material. The electrospray device also comprises a hydrophobic coating substantially selectively covering the tip portion. The hydrophobic coating is electrically nonconductive.