460 results about "Cellular imaging" patented technology

The present invention relates generally to the fields of chemistry and radionuclide imaging. More particularly, it concerns compositions, kits and methods for imaging and therapy involving N₄ compounds and derivatives.

The disclosure relates to metallic nanophotonic crescent structures, or “nanocrescent SERS probes,” that enhance detectable signals to facilitate molecular detections. More particularly, the nanocrescent SERS probes of the disclosure possess specialized geometries, including an edge surrounding the opening that is capable of enhancing local electromagnetic fields. Nanosystems utilizing such structures are particularly useful in the medical field for detecting rare molecular targets, biomolecular cellular imaging, and in molecular medicine.

The invention provides an N, P and S-codoped fluorescent carbon quantum dot and a preparation method and application thereof, and belongs to the technical field of luminescent nanomaterials. The preparation method comprises the steps that a biological bacterium (saccharomycete or escherichia coli or staphylococcus aureus or aspergillus niger) is taken as a carbon source, water of the corresponding volume is added, and a hydrothermal reaction is performed to obtain a dark brown solution; after the reaction stops and a reaction kettle is naturally cooled, dialysis is performed to remove impurities, an aqueous carbon quantum dot solution is obtained, and after freeze drying is performed, the N, P and S-codoped fluorescent carbon quantum dot is obtained. According to the method, the biomass is taken as the carbon source, the raw material is wide in source, low in cost, green and environmentally friendly, the technology is simple, and the preparation condition requirement is low. The obtained carbon quantum dot can be applied to detection on Cr (VI) ions, MnO4<-> and ascorbic acid by serving as a switch-type fluorescent probe and also can be used for cell imaging.

The invention discloses a preparation method and application of carbon dot/gold composite nanoparticles. Citric acid and cysteine are taken as raw materials, and N-S codoping carbon dots are synthesized; the carbon dots serve as the heterogeneous nucleation center of the gold nanoparticles, a reducing agent and a stabilizing agent, any other auxiliaries such as a surface active agent or an adsorbent do not need to be added, and the carbon dot/gold composite nanoparticles are prepared by further reducing chloroauric acid. The preparation method of the carbon dot/gold composite nanoparticles is simple, convenient, feasible, mild in reaction condition and environmentally friendly, and the prepared carbon dot/gold composite nanoparticles have the characteristics of being high in quantum yield, small in size, low in biotoxicity, resistant to photobleaching and the like, and can be applied to the fields such as cell imaging or catalytic reaction research.

An exemplary embodiment of apparatus and method according to the present disclosure can be provided. For example, using at least one first arrangement, it is possible to direct at least one first electro-magnetic radiation to at least one portion of tissue within a body. Using at least one second arrangement, it is possible to receive at least one second electro-magnetic radiation provided from the portion, which is based on the first electro-magnetic radiation. Further, using at least one third arrangement, it is possible to differentiate at least one particular cell which is eosinophil, mast cell, basophil, monocyte and/or nutrophil from other cells in the portion based on the second electro-magnetic radiation.

A system and method of providing illumination for a cell imaging system delivering modulated light for illumination of a sample. Modulation of illumination intensity may be effectuated by pulsing the output of a light source, for example, or by selectively interrupting light provided by the source. Such modulated illumination may have particular utility in applications where reducing the number of electrons in a super-excited state may minimize the rate of photobleaching and photodamage in the molecules being studied.

The invention relates to synthesis of fluorescent molecules with aggregation-induced emission (AIE) characteristics and application as fluorescent probes for cellular imaging, killing, and antibiotic screening, wherein the cells are bacteria or mammalian cells. The fluorescent molecules generate reactive oxygen species (ROS) upon light irradiation. The invention also relates to a probe comprising fluorescent molecules exhibiting AIE phenomenon, wherein the probe is used for bacterial and biological study. The invention further relates to a method of imaging and quantifying bacterial, a method of killing cells, a method of high throughput antibiotics screening and determining bacteria resistance, a method of photodynamic therapy, and a method of determining critical micelle concentration.

An endoscopic imaging device for endoscopy in a body vessel is disclosed. The device comprises an annular illumination tube comprising an annular illumination fiber for illuminating a body vessel during endoscopy. The device further includes a first imaging tube comprising a first imaging fiber for gross examination and navigation through the body vessel. The first imaging fiber is disposed within the annular illumination tube. The device further comprises a second imaging tube comprising a second imaging fiber for cellular imaging. The second illumination fiber is disposed adjacent the first imaging tube and within the annular illumination tube.

The invention relates to a method for using a DNA tetrahedron as a scaffold on a nano-particle surface and initiating rolling circle amplification reaction; after the prepared DNA tetrahedron is assembled on the nano-particle surface, a section of single-stranded DNA extending on the DNA tetrahedron can be used as primer DNA; circular DNA complementary with a special aptamer sequence is used as an amplification template; the circular DNA is hybridized with the primer DNA while the rolling circle amplification reaction is initiated; and the prepared product is multiple long single-stranded DNA composed of multiple apatmer structures on the nano-particle surface. The method disclosed by the invention is capable of effectively regulating and controlling the DNA distribution density on the nano-particle surface, so that the hybridization efficiency of the primer DNA and the circular DNA is increased; by means of long single-stranded DNA composed of the multiple aptamer structures prepared through the rolling circle amplification technology, the CTC (Carbon Tetra Choride) capture efficiency is greatly increased; and thus, the method disclosed by the invention has potential application value in the research fields, such as cell detection, cell capture, cell imaging and the like.

A method of preparing fluorescent carbon dots by adopting waste sugarcane molasses as a raw material and application of the fluorescent carbon dots are disclosed. The method includes weighing 4.0-6.0 g of the waste sugarcane molasses, performing pyrolysis at 240-260 DGE C, adding 4-6 mL of deionized water, filtering the mixture with a filter membrane having a pore size of 0.22 [mu]m, adding dropwise the filtrate into absolute ethanol, performing centrifugation for 5 min at a rotating speed of 6000 round/min, collecting a clear liquid, performing vacuum concentrating to remove the ethanol, adding the deionized water again, filtering the mixture with the filter membrane having a pore size of 0.22 [mu]m, collecting a filtrate, and freeze-drying the filtrate to obtain the fluorescent carbon dots. A preparing process of the fluorescent carbon dots is simple and raw materials are cheap. The fluorescent carbon dots have characteristics of good biocompatibility, good bleaching resistance performance, high optical stability, excellent fluorescent properties, and the like, and can be used for cell imaging and used for content detection of a food coloring agent that is sunset yellow.

The invention provides a ratio-type pH fluorescence probe for water-soluble locating lysosome as well as a preparation method, an application and a test method of the ratio-type pH fluorescence probe. The chemical structural formula of the ratio-type pH fluorescence probe is shown in the specification. The probe can detect changes of strength of fluorescence with two emission wavelengths simultaneously, external influences are eliminated through self-calibration, the detection accuracy is high, the speed of response to pH changes is high, and the probe has excellent water solubility and has very good anti-interference capacity in the existence of various metal ions. The fluorescence strength changes remarkably in the pH range from 5.8 to 6.8, and the probe is suitable for pH detection under a weak acidic condition. Experiments prove that the probe can selectively dye lysosome in cells, the light stability in the cells is good, and the probe is non-toxic to the cells and can be used for pH detection of live cells. The probe has very important application value in cell imaging and detection of changes of the pH value in lysosome.

Provided herein are a luminogen compound of formula (I) including a AIE luminophore moiety conjugated with a maleimide moiety and a use of the same for detecting thiol groups in biomolecules. Also provided is a dye molecule, a biosensor or a bioprobe comprising the luminogen compound of formula (I) in use for detecting thiol groups in biomolecules. The detection method of the present subject matter not only has high thio-selectivity and sensitivity, but also is rapid, convenient and handy.

Described herein is a polarization microscope that uses spectral-encoding of the polarization state for cellular imaging. The spectral-encoded polarization microscope is both sufficiently fast for cellular imaging and is compatible with high extinction optics required to image molecular structures and assemblies. The spectral-encoded microscope allows for the polarization state of light presented to the specimen to sample discrete states over the entirety of the Poincaré sphere while simultaneously giving a null measurement of the observed cellular birefringence. Sampling over the entire Poincaré sphere allows the microscope to determine of specimen phase retardation due to both linear and circular birefringence. The spectral-encoded polarization microscope can be operated in a slightly off-null state that will improve signal-to-noise.

The invention relates to the construction and application of a gold-magnetic nanoparticle-based medicament carrying platform, which belong to the technical field of magnetic nanophase materials. The construction comprises the synthesis of magnetic nanoparticles, the synthesis of an Fe3O4-SiO2 nuclear shell structure, the amine surface modification of the Fe3O4-SiO2 nuclear shell structure, protonation and the electrostatic adherence of gold nanoparticles after the surface modification, the coupling of curcumin and the coupling of mercapto polyethylene glycol PEG-SH so as to prepare a multifunctional gold-magnetic nano-platform. The construction and the application have the following advantages that: the gold-magnetic nanoparticle-based medicament carrying platform is a magnetic carrier with a modified surface and has the characteristics of relatively stronger magnetism, good chemical inertness, biocompatibility, easy functionalization and the like, and can be prepared by a simple method; and the magnetic nanophase materials can be quickly separated with a magnetic field in a suspension system, are highly concentrated and act on tumor cells under the guidance of an external magnetic field, and can be applied in biological fields, such as bioseparation, medicament transportation, biological tags, cell imaging and developing and study on the separation of cells or other biomolecules.

The invention discloses a preparation method and an application of a boron-dipyrromethene (BODIPY) based fluorescent probe for determining cysteine (Cys). The structural formula of the probe is shown in the specification. The preparation method of the BODIPY derivative based Cys fluorescent probe with a simple structure is provided, and the BODIPY derivative based Cys fluorescent probe is used for directly measuring Cys concentration. In the system, the fluorescent probe shows good selectivity and is not interfered with other biological thiols (Hcy and GSH) and other 19 amino acids. The probe shows quite high sensitivity to Cys, and the fluorescence intensity is enhanced by 23 times when 3 equivalents of Cys are added. When the pH is between 6.0 and 8.0, determination of Cys by the fluorescent probe is not affected by pH. The fluorescence probe and Cys act quickly, and the response time is within 6 minutes. In addition, the probe can also be used in cell imaging to detect intracellular Cys.

The invention provides a method and apparatus for isolating individual target cells. The apparatus includes a body structure comprising a main channel, a collection channel, and a waste channel fluidly coupled at a first fluid junction. A plurality of trapping channels intersect the collection channel, each trapping channel having a diameter at a location adjacent to the intersection of the trapping channel with the collection channel that is less than a diameter of an individual target cell. The apparatus also includes an imaging system configured to image individual target and non-target cells within the main channel, thereby producing imaging data; a processor configured to perform real-time, multivariate analyses of the imaging data; and a directing system configured to direct the individual target cells. A pressure source is in fluid communication with one or more of the collection channel, the waste channel, the first side channel, and the second side channel.

The invention provides a sulfur quantum dot as well as a preparation method and application thereof. The preparation method comprises the following steps: adding sulfur powder into a dispersion systemfor ultrasonic treatment to obtain dispersion liquid; wherein the dispersion system comprises polyethylene glycol and hydrogen peroxide; transferring the dispersion liquid into a reaction kettle forsolvothermal reaction; and after the reaction is finished, naturally cooling to room temperature and adjusting the pH value to be neutral to obtain the sulfur quantum dot. The sulfur quantum dot prepared by the method is high in yield, rich in surface functional groups, relatively small in size, relatively uniform in particle size distribution, good in water solubility, good in dispersity, good inbiocompatibility and excellent in fluorescence property, and can be widely applied to the fields of cell imaging, ion detection and the like.

A system and method of sensing physiological conditions in biological applications includes a laser source for optically exciting a plurality of luminescent quantum dots and a plurality of biomolecules in a nanoscale sensing system having a nanocrystal structure, where the plurality of biomolecules is stained with dye. In a multi-photon excitation process, a laser system optically excites, the plurality of luminescent quantum dots and the plurality of biomolecules in the nanoscale sensing system, where fluorescence resonance energy transfer (FRET) occurs between the plurality of quantum dots and the plurality of biomolecules. Stability of self assembly of quantum dot peptide conjugates within the plurality of biomolecules is investigated. Physiological conditions at the cellular level are determined, using a spectrometer to sense fluorosence spectra. The sensing of physiological conditions includes transducing signals into immunoassays, clinical diagnostics and cellular imaging to provide treatment to biological subjects including human patients.

The invention discloses a stimulated emission loss fluorescent lifetime super-resolution imaging device for live cell imaging. The problem that the live cell imaging precision is low in the prior artis solved. The imaging device comprises a loss laser provider, a loss laser regulating module arranged at an output end of the loss laser provider, an excitation laser provider arranged at one side ofthe loss laser provider, a synchronization controller arranged between the excitation laser provider and the loss laser provider, an excitation laser regulating module arranged at the output end of the excitation laser provider, a spiral phase plate arranged at one side of the loss laser regulating module, a slide arranged at one side of the spiral phase plate, a second dichroic mirror arranged at one side of the slide, a first dichroic mirror arranged at one side of the second dichroic mirror, a sample fluorescent collection module arranged at one side of the first dichroic mirror, a florescent imaging module arranged at one side of the second dichroic mirror, and a reference fluorescent signal collecting module arranged at one side of the excitation laser regulating module, thereby improving the live cell imaging precision.

The invention discloses a relatively long emission wavelength fluorescent carbon quantum dot and a preparation method thereof. According to the method, L-ascorbic acid is used as a carbon source, anda certain proportion of passivating agents and solvents is added and uniformly mixed with L-ascorbic acid to obtain a clear transparent solution; the mixed liquid is placed in a reaction kettle for areaction for a few hours at high temperature and then is naturally cooled to room temperature; the reaction liquid is subjected to separation and purification treatment, and a fluorescent carbon quantum dot solution is obtained. The preparation method provided by the invention has the advantages of simple process, mild condition, low production cost and environmental protection; the prepared carbon quantum dots have a relatively long fluorescence emission wavelength, can achieve controllable emission wavelength, good water solubility, diversity of surface properties, uniform distribution of particle size and other characteristics by adding different types of passivating agents, and can be widely used in cell imaging, biomarker, biochemical sensing and other fields.