Abstract: A kind of online PM2.5 concentrated collection instrument and method are provided including five parts: PM2.5 cutting head, water tank system, virtual cropping system, condenser circulation system and online concentrated collection system. Connected with PM2.5 cutting head, a water tank system contains water tank, electrical heating rod and temperature-controlled digital display device. Virtual cropping system contains virtual cutter, concentrated air vacuum pump, and main air vacuum pump. The condenser circulation system circulating condensate condenses to grow the saturated particles, condenser circulation system contains condensate circulation tube, condensing machine. The online concentrated collection system contains biological sampling bottle, solenoid valve with relay, automatic distillate collector and computer subdivision constant-current pump. Real PM2.

Abstract: A kind of online PM2.5 concentrated collection instrument and method are provided including five parts: PM2.5 cutting head, water tank system, virtual cropping system, condenser circulation system and online concentrated collection system. Connected with PM2.5 cutting head, a water tank system contains water tank, electrical heating rod and temperature-controlled digital display device. Virtual cropping system contains virtual cutter, concentrated air vacuum pump, and main air vacuum pump. The condenser circulation system circulating condensate condenses to grow the saturated particles, condenser circulation system contains condensate circulation tube, condensing machine. The online concentrated collection system contains biological sampling bottle, solenoid valve with relay, automatic distillate collector and computer subdivision constant-current pump. Real PM2.

Abstract: A microfluidic system has a microfluidic mixer and a sample storage component that is in fluid connection with the microfluidic mixer.

Abstract: New microfluidic devices, useful for carrying out chemical reactions, are provided. The devices are adapted for on-chip solvent exchange, chemical processes requiring multiple chemical reactions, and rapid concentration of reagents.

Abstract: A microfluidic device allows for different reactions to be conducted in parallel with the use of nanoliter quantities of reagents.

Abstract: This invention provides microfluidic samplers for withdrawing one or more precise micro- or nano-liter volumes of a sample. The invention provides microfabricated automatic systems comprising integrated poly(dimethyl-siloxane) (PDMS) micro fluidics. The sample can be biological samples, including samples from animals or plants. The samples can be fluid or gas. The samples can comprise a biological fluid, such as blood, tears, cerebral spinal fluid (CSF) and the like, from a test subject such as a human or a mouse. The invention also provides methods for making and using the microfluidic samplers of the invention.

Abstract: Microfluidic chips, systems including at least one integrated microfluidic chip operably connected to hardware (e.g., docking device, high voltage electrodes, portable fluorescence microscope, computer, etc.), and methods for analyzing peptides (e.g., toxins), proteins (e.g., cancer biomarkers, recombinant human growth hormone, recombinant human erythropoietin), and protein expression in biological samples (e.g., human serum, urine, or tissue, marine organism, seafood, etc.) have been developed. On a single microfluidic chip as described herein, several sequential processes for analyzing a protein (e.g., cell culturing, cell lysis, protein enrichment, protein labeling, and protein detection) can be performed in an automated fashion.

Abstract: New microfluidic devices, useful for carrying out chemical reactions, are provided. The devices are adapted for on-chip solvent exchange, chemical processes requiring multiple chemical reactions, and rapid concentration of reagents.