Abstract: A system and method to extend a dynamic range of fluorescence measurements. The system includes a neutral density filter stack apparatus including a plurality of neutral density filters. The neutral density filter stack modulates the intensity of light from a source. This modulation improves the ability to detect emissions from a wider-range of fluorophore concentrations, specifically addressing inner-filter effects at higher concentrations that would normally require sample dilution. It can be used in a system in which absorbance and fluorescence measurements are carried out, wherein the intensity of the light source is modulated with the apparatus for the fluorescence measurements. In this hybrid system, the stack modulates the intensity of the excitation light source for fluorescence measurements to be made at very low concentrations of analyte. The hybrid system also includes optics for absorbance measurements to be made at concentrations of analyte that are higher than those detected by fluorescence.

Abstract: A method for managing high availability messaging queueing is disclosed herein. The method includes receiving, by a first messaging server of a plurality of messaging servers in a first messaging cluster, a first request from a client server, the first request including a plurality of messages to be processed, storing, by the first messaging server, the received plurality of messages, replicating, by the first messaging server, the plurality of messages to the remaining servers of the plurality of messaging servers in the first messaging cluster, and sending, by the first messaging server, a first response to the client server after replicating the plurality of messages to the remaining servers of the plurality of messaging servers.

Abstract: A method for managing high availability messaging queueing is disclosed herein. The method includes receiving, by a first messaging server of a plurality of messaging servers in a first messaging cluster, a first request from a client server, the first request including a plurality of messages to be processed, storing, by the first messaging server, the received plurality of messages, replicating, by the first messaging server, the plurality of messages to the remaining servers of the plurality of messaging servers in the first messaging cluster, and sending, by the first messaging server, a first response to the client server after replicating the plurality of messages to the remaining servers of the plurality of messaging servers.

Abstract: A retractable charging device for bridging a distance from an electronic device to an outlet includes a housing. A retractor is coupled to and positioned in the housing. A cable is operationally coupled to the retractor so that the cable is selectively extensible from the housing. The retractor is positioned to selectively retract the cable into the housing. A coupler that is coupled to a terminus of the cable is configured to operationally couple the cable to an electronic device of a user. A cord that is coupled to and extends from the housing is operationally coupled to the cable. A power supply, which is AC to DC type, is operationally coupled to the cord. A connector that is coupled to the cord is configured to couple the power supply to a source of alternating current to recharge a battery of the electronic device of the user.