21 results about "Electrophoretic mobilities" patented technology

A method, comprising: determining electrophoretic mobility associated with a particle in a transverse alternating force microfluidic channel; determining a size of the particle based at least in part on one of Brownian motion of a particle or one or more images of the particle. A system comprising: a microfluidic channel; a plurality of electrodes oriented transverse to the microfluidic channel, the plurality of electrodes comprising an alternating electric field; and a classification system configured to: determine one or more of the following: an electrophoretic mobility associated with a particle in the transverse AC microfluidic channel and / or determine, based at least in part on the electrophoretic motion, and size from image analysis or Brownian motion of a particle or one or more images of the particle, particle shape, particle deformability, for recognition of surface characteristics, such as assaying for receptors and ligands, and to perform electroporation.

The present disclosure describes an external vibration isolation device for electrophoretic mobility measurement. In one exemplary embodiment, the apparatus includes at least three springs, (1) wherein each of the at least three springs includes (a) a top flexure ring, (b) a bottom flexure ring, (c) a plurality of external rigid connectors, and (d) an internal rigid connector, (2) wherein the plurality of external rigid connectors and the internal rigid connector couple the top flexure ring and the bottom flexure ring to each other, (3) wherein the internal rigid connector is connected to a surface of a chassis of an electrophoretic mobility measurement instrument, and (4) wherein the plurality of external rigid connectors are connected to a grounded surface of a housing of the instrument.

The invention relates to the technical field of papermaking, in particular to a polyelectrolyte compound for constructing a papermaking filler reinforcement and a papermaking method. The polyelectrolyte compound homogeneous liquid comprises a polyelectrolyte compound and a solvent, and the polyelectrolyte compound is uniformly and stably distributed in the solvent; the polyelectrolyte compound is formed by compounding anionic macromolecules and cationic macromolecules through the charge effect, the particle size of the polyelectrolyte compound is 50 nm to 50 microns, and the electrophoretic mobility is-2.0 * 10 <-8 > m < 2 > (Vs) <-1 > to-0.6 * 10 <-8 > m < 2 > (Vs) <-1 > or 0.5 * 10 <-8 > m < 2 > (Vs) <-1 > to 3.0 * 10 <-8 > m < 2 > (Vs) <-1 >. The polyelectrolyte compound can stably exist in a solution, flocculation groups obtained by flocculation of papermaking filler can resist relatively strong shearing force, the polyelectrolyte compound is particularly suitable for treating precipitated calcium carbonate (PCC) filler which is difficult to treat by a common method, and meanwhile, the binding force between the filler and fibers can be increased; therefore, the phenomena of hair falling and powder falling are relieved under the condition that high ash content is added, and the paper strength is ensured under the condition that a large amount of filler is added.

This invention discloses tree fern. AspiMYB5 The application of genes in regulating the biosynthesis of tree fern phenols belongs to the field of genetic engineering technology, which involves regulating the biosynthesis of tree fern phenols within plants. AspiMYB5 The expression level of the gene, thereby regulating the key enzyme gene of tree fern phenol. AspiPKS6 The expression of [a specific enzyme] and the synthesis of tree fern phenol. This invention uses a yeast library screening method to screen genes affecting key enzymes. AspiPKS6 Expressed transcription factors AspiMYB5 The results were verified using yeast single-hybrid technology (Y1H) and electrophoretic mobility variation analysis (EMSA). AspiMYB5 and AspiPKS6 The promoter exhibits direct physical binding in vitro. Dual-luciferase reporter gene assays further demonstrate that... AspiMYB5 and AspiPKS6 When the promoter is co-expressed, the fluorescence signal intensity is significantly reduced, further confirming... AspiMYB5 It can inhibit AspiPKS6 AspiMYB5 Promoter activity. This invention not only improves the theoretical research on the biosynthetic pathway of tree fern phenols, but also provides key target genes and technical support for regulating the content of secondary metabolites in rare plants through genetic improvement.

The present disclosure describes a method, system, and computer program product for calculating electrophoretic mobility of a sample by extracting a frequency shift. In one embodiment, the method, system, and computer program product include receiving at least one frequency domain spectrum related to light intensity detector data corresponding to a sample, truncating the spectrum to a region of interest, establishing a minimum fitter amplitude for the content constituting peaks, identifying possible different peaks in the region of interest, and determining whether the peaks are different or not. In one embodiment, an initial parameter for fitting at least one different peak among the possible different peaks is found, a selected fitting model from among a plurality of fitting models relative to the possible different peaks is selected, and the at least one different peak is fitted to the selected fitting model, thereby producing at least one fitting signal peak corresponding to the light intensity detector data, the electrophoretic mobility of particles in a sample is allowed to be calculated.

The application relates to a capillary electrophoresis system and method combined with a non-continuous sample injection mass spectrum, wherein the system comprises: an electrophoretic separation-electrospray ionization module for separating components in a target analyte according to different electrophoretic mobilities; a real-time adjustable high-voltage power supply device for providing a voltage required by capillary electrophoresis according to the requirements of an electroosmotic flow and an electrophoretic speed in a capillary; a target component signal feedback module for detecting a target analyte or a real-time electroosmotic flow speed; an electrophoretic current measurement and migration time correction module; a real-time feedback signal processing and control module; and a non-continuous sample injection mass spectrum system. Thus, the problems in the prior art that, when a continuous capillary electrophoresis technology is combined with a non-continuous sample injection small mass spectrum system, the accuracy is reduced, the analysis quality is poor, the sampling frequency is greatly limited, it is difficult to ensure that mass spectrum data at the highest point of a chromatographic peak can be collected, and the sensitivity of detection and the accuracy of quantitative analysis are affected are solved.

The present disclosure describes an apparatus for measuring electrophoretic mobility. In one embodiment, the apparatus comprises: a laser; a fiber optic splitter optically coupled to the laser; the polarization maintaining acousto-optic modulator is optically coupled to the sample arm output end of the splitter; the sample cell is used for containing a sample and is optically coupled to the output end of the acousto-optic modulator; a polarization maintaining combiner optically coupled to the reference arm output of the splitter and to the output of the sample cell; a photodetector for detecting the light output from the combiner; the radio frequency source is electrically coupled to the input end of the acousto-optic modulator; and a demodulator electrically coupled to the output of the photodetector and to the output of the radio frequency source to output in-phase data and quadrature-phase data of a frequency offset to be analyzed to measure electrophoretic mobility in the sample.

The electrophoretic medium comprises a fluid and particles of first, second, third and fourth types (W, Y, R, B) having four different colors. The first and third particles have one polarity of charge, while the second and fourth particles have the opposite polarity of charge; the first particles have a greater electrophoretic mobility or electrophoretic motility than the third particles, and the second particles have a greater electrophoretic mobility or electrophoretic motility than the fourth particles. One particle is white (W), one non-white particle (B) is partially light-transmissive, and the remaining two non-white particles (R, Y) are light-reflective. A third light-reflective particle (G) can be added to create a five-particle medium.

The invention discloses a method for determining a binding constant between an aptamer and a small molecule target through capillary electrophoresis. According to the improved affinity capillary electrophoresis method, a small section of buffer solution containing the aptamer is injected firstly, then the small molecule target is injected, the small molecule target enters a short zone of the aptamer to interact with the short zone in the electrophoresis migration process, and the small molecule target is detected according to the effective electrophoresis migration rate change trend of the small molecule target under different aptamer concentration conditions. Determining a combination constant between the two; compared with a traditional affinity capillary electrophoresis method, the method has the advantages that the consumption of the sample and the reagent can be remarkably reduced, the adsorption of the capillary inner wall to the sample is reduced, the signal stability is improved, the detection time of a single sample does not exceed 10 minutes, and the binding constant between the small molecule target and the aptamer can be rapidly and accurately determined.

The present disclosure describes a method, system, and computer program product including a process in which measurement data collected by an instrument is adaptively collected until a desired relative or absolute accuracy is achieved.

A synchronous coefficient of drag alteration method and system for concentrating and purifying nucleic acids from a sample containing unwanted molecules and contaminants are provided. The method includes providing a layer of artificial gel or sieve filled with liquid and into which molecules including nucleic acids are introduced from a sample liquid by applying a steady electric field across a boundary between the artificial gel layer and the sample liquid containing the molecules including nucleic acids; providing a plurality of electrodes spaced apart around circumference of the artificial gel layer and for delivering a pre-programmed sequence of voltage waveforms to establish a primary electric field driving molecules within the artificial gel layer and a secondary electric field altering electrophoretic mobility of molecules within the artificial gel layer. The nucleic acids alone are spatially separated from the unwanted molecules and contaminants to be relatively purified and enriched.

The application discloses a kind of nanoparticle aggregation settlement performance parameter processing method, applied to water environment science and technology field.The application includes the following steps: obtaining the particle size of the nanoparticle of the sample to be tested, Zeta potential and electrophoretic mobility under different test liquid conditions;In MATLAB computing environment, the thickness of humic acid adsorption layer on the surface of the nanoparticle of the sample to be tested is solved by numerical inversion fitting algorithm;The thickness of humic acid adsorption layer, the particle size and Zeta potential of the nanoparticle are used as input parameters, and the van der waals attractive interaction potential, electrostatic double layer repulsive interaction potential, steric interaction potential and total potential energy are calculated based on XDLVO theory.The application improves the efficiency, accuracy and repeatability of parameter solving and energy calculation, and provides reliable data and calculation basis for the analysis of nanoparticle aggregation settlement mechanism and the prediction of stability under complex water quality conditions.

A computer implemented method comprises flowing a sample through a sample cell at a flow rate; applying an electric field to the sample while the sample is flowing through the sample cell; and measuring electrophoretic mobility of particles in the sample using light scattering techniques while the sample is flowing and the electric field is applied. The flowing removes degraded sample particles from a measurement region of the sample cell during the measuring and replaces the degraded sample particles with a fresh sample. The flowing removes heat generated by Joule heating from the measurement region. The flowing enables an application of a higher electric field strength, thereby increasing a Doppler shift and reducing measurement time and measurement error.

The invention discloses a method for determining electrophoresis mobility of soapstone by using agarose gel. The agarose gel is innovatively introduced for determining the electrophoresis mobility of the soapstone, so that on one hand, the problem of electrophoresis mobility determination deviation caused by soapstone particle aggregation is solved; on the other hand, the sample dosage is small, complex instrument operation is not needed, the equipment investment cost is low, operation is stable, and the accuracy and repeatability of a measurement result are improved; the method has practical application value in the fields of soapstone production quality control, colloidal chemistry and material characterization research, environmental governance and the like.

An electrophoretic mobility apparatus comprising a light source, a sample fiberoptic path along which a first source of light including a sample beam travels from the light source, a sample cell along the sample fiberoptic path that receives the first source of light, a reference fiberoptic path along which a second source of light including a reference beam travels from the light source; a lens along the reference fiberoptic path that forms a plane parallel beam from the second source of light; a modulator along the reference fiberoptic path that provides frequency control of the second source of light, a beamsplitter combines the reference beam with a fraction of light scattered from the particles and forms a coherent beam, and a detector comprising an array of photo detector elements onto which the coherent beam is incident, wherein each detector element produces time varying signals from the coherent beam.

This application belongs to the field of electrophoretic display technology, and particularly relates to an electrophoretic particle, its preparation method, and its application. The electrophoretic particle of this application has a porous structure; simultaneously, the electrophoretic particle includes a matrix with a high refractive index and a low refractive index dispersed phase dispersed in the matrix. By adopting the technical solution of this application, the scattering efficiency of the electrophoretic particle can be enhanced and the electrophoretic mobility can be improved, thereby improving the electrophoretic display effect and response speed.

An electrophoretic mobility apparatus comprising a light source, a sample fiberoptic path along which a first source of light including a sample beam travels from the light source, a sample cell along the sample fiberoptic path that receives the first source of light, a reference fiberoptic path along which a second source of light including a reference beam travels from the light source; a lens along the reference fiberoptic path that forms a plane parallel beam from the second source of light; a modulator along the reference fiberoptic path that provides frequency control of the second source of light, a beamsplitter combines the reference beam with a fraction of light scattered from the particles and forms a coherent beam, and a detector comprising an array of photo detector elements onto which the coherent beam is incident, wherein each detector element produces time varying signals from the coherent beam.

The present disclosure describes a vibration isolation device for electrophoretic mobility measurement. In one exemplary embodiment, the apparatus includes: (1) at least four chassis pins coupled to a chassis of an electrophoretic mobility measurement instrument; (2) at least four fan pins coupled to the fan to cool the chassis; (3) at least four extension springs secured to the chassis via chassis pins and to the fan via fan pins; and (4) at least four compression springs positioned between the surface of the chassis and the surface of the fan such that the extension spring can pull the fan against the compression springs.

The invention discloses a self-powered small-molecule traditional Chinese medicine ion introduction acupoint patch which sequentially comprises an elastic backing layer, a piezoelectric energy collection layer, a drug-loaded conductive hydrogel layer and a release protection layer from outside to inside, the piezoelectric energy collection layer comprises a rectifier module, and the drug-loaded conductive hydrogel layer is arranged to be a solid ionic gel or semi-interpenetrating network hydrogel film. According to the self-powered small-molecule traditional Chinese medicine iontophoresis acupoint patch and the preparation method thereof, a microencapsulation technology is abandoned, free-state traditional Chinese medicine small molecules are directly adopted, and deep skin penetration is achieved through the high electrophoresis mobility of the free-state traditional Chinese medicine small molecules under a high-voltage electric field; through the design of an integrated flexible rectifying circuit or an asymmetric electrode, piezoelectric alternating current is converted into pulsating direct current, it is ensured that charged medicine is always subjected to one-way electric field force pointing to the deep layer of the skin, and meanwhile low-cost and large-scale manufacturing is achieved.

The present invention provides an electrophoretic fluid comprising a fluid and five types of particles dispersed in the fluid, a display device comprising the same, and a driving method thereof. The electrophoretic fluid comprises (a) white light-scattering particles and black light-absorbing particles having a common charge of a first polarity, and (b) three types of colored particles having a common charge of a second polarity opposite to the first polarity and having subtractive primary colors of cyan, magenta, and yellow, respectively. Essentially, (c) all of the particles are substantially opaque (opacity index ≥ 0.95), and (d) the three types of colored particles have distinct hierarchical electrophoretic mobilities (mobility ratio ≥ 1.5). The display device of the present invention comprises the medium and has a contrast ratio of 10:1 or greater in the black state. The driving method of the present invention implements color by selectively driving the particles with different mobilities by adjusting a voltage pulse width of substantially constant amplitude. This enables the realization of a full-color electrophoretic display that is easy to manufacture, offers excellent contrast ratio through the realization of 'real black', and is simple to operate with high reliability.

A computer implemented method comprises flowing a sample through a sample cell at a flow rate; applying an electric field to the sample while the sample is flowing through the sample cell; and measuring electrophoretic mobility of particles in the sample using light scattering techniques while the sample is flowing and the electric field is applied. The flowing removes degraded sample particles from a measurement region of the sample cell during the measuring and replaces the degraded sample particles with a fresh sample. The flowing removes heat generated by Joule heating from the measurement region. The flowing enables an application of a higher electric field strength, thereby increasing a Doppler shift and reducing measurement time and measurement error.