A method is provided that includes introducing a fluid sample (19) into a fluid container (2, 502, 702) of a filtration assembly (20, 500, 720) and passing the fluid sample (19) through a porous filter (5, 705) by distally advancing a plunger (3, 610, 703) within the fluid container (2, 502, 702), thereby capturing, on or within the porous filter (5, 705) at least a portion of any particulate present in the fluid sample (19). Thereafter, a cavity (28, 628, 728) is created within the fluid container (2, 502, 702) between a distal end of the plunger and a distal end (49, 549, 749) of the fluid container (2, 502, 702) by proximally partially withdrawing the plunger (3, 610, 703) within the fluid container (2, 502, 702), while one or more vacuum-prevention openings (11, 711) are open. An extraction liquid (30) is prepared by introducing one or more extraction reagents (29) into the cavity (28, 628, 728) and bathing the porous filter (5, 705). The extraction liquid (30) is tested for the presence of a biological target. Other embodiments are also described.

A microfilter comprising a polymer layer formed from epoxy-based photo-definable dry film, and a plurality of apertures each extending through the polymer layer. A method of forming a microfilter is also disclosed. The method includes providing a first layer of epoxy-based photo-definable dry film disposed on a substrate, exposing the first layer to energy through a mask to form a pattern, defined by the mask, in the first layer of dry film, forming, from the exposed first layer of dry film, a polymer layer having a plurality of apertures extending therethrough, the plurality of apertures having a distribution defined by the pattern, and removing the polymer layer from the substrate.

The invention relates to a system and micro monitor apparatus, a space-, time-, and cost-efficient device to concentrate, identify, and quantify organic compounds in gas environments. The invention further relates to a method centered on gas chromatography for identifying and quantifying organic compounds in gas environments, using air as the carrier gas, without the need for a compressed pre-bottled purified carrier gas.

The disclosure is directed to a device that includes an upper container configured to receive a fluid sample collected from a mammal into a first opening, the first opening opposite a second opening and a membrane covering at least a portion of the second opening, the membrane configured to allow transmission of a portion of the fluid sample through the membrane.

Devices, systems and methods are disclosed which relate to a prefiltration device that can be used with the concentrating pipette instruments and other devices which draw a sample in through one opening and dispense a concentrated or eluted sample out through the same opening. The device allows the sample to be passed through a prefilter when entering the opening and then bypassed the prefilter when being dispensed through the same opening.

Disclosed herein are articles and methods for blood separation. For example, inventive articles and methods that remove red blood cells from blood samples are described.

The present invention relates to a method for manufacturing a surface-enhanced Raman scattering substrate, a urine pretreatment method, and a method for providing information required for cancer diagnosis through urine metabolite analysis using same.

A kit for extracting drug residues from livestock or poultry aquatic products according to the present disclosure includes a pipe, a first powder mixture layer and a second powder mixture layer. The pipe has an output port at the bottom thereof and an input port at the top thereof for inputting a sample solution. The first powder mixture layer is in the form of powder and filled in the pipe. The first powder mixture layer contains anhydrous sodium sulfate powder and sodium chloride powder. The second powder mixture layer is in the form of powder and filled in the pipe. The second powder mixture layer is located below the first powder mixture layer and above the output port. The second powder mixture layer contains anhydrous sodium sulfate powder and C18 powder. The present disclosure further provides a method of obtaining a primary test liquid from livestock or poultry aquatic products using the above kit.

Provided is a method for testing a perovskite precursor solution, including: taking a perovskite precursor solution containing a plurality of dispersed perovskite colloids as a sample to perform liquid analysis, thereby obtaining an analysis information; and determining whether the perovskite precursor solution is a good product based on obtained analysis information from the liquid analysis, wherein the analysis information is at least one selected from the group consisting of element content of the colloid, element distribution, colloid size, and colloid appearance, thereby a feasible and effective testing method is defined through the correlation between the perovskite precursor colloid and the perovskite.

Examples are directed toward systems and methods relating to collecting and analyzing samples. For example, a system includes a cold trap that directly collects a sample. The cold trap operates to serve as a collection filter while the system draws in a flow across the cold trap. A thermal heater, coupled to the cold trap, flash heats the cold trap to produce a released sample from the cold trap at a release concentration. An analyzer entrains the released sample at the release concentration into a sampling flow of the analyzer for analysis.