261 results about "Specific fluorescence" patented technology

An element-specific imaging technique utilizes the element-specific fluorescence X-rays that are induced by primary ionizing radiation. The fluorescence X-rays from an element of interest are then preferentially imaged onto a detector using an optical train. The preferential imaging of the optical train is achieved using a chromatic lens in a suitably configured imaging system. A zone plate is an example of such a chromatic lens; its focal length is inversely proportional to the X-ray wavelength. Enhancement of preferential imaging of a given element in the test sample can be obtained if the zone plate lens itself is made of a compound containing substantially the same element. For example, when imaging copper using the Cu La spectral line, a copper zone plate lens is used. This enhances the preferential imaging of the zone plate lens because its diffraction efficiency (percent of incident energy diffracted into the focus) changes rapidly near an absorption line and can be made to peak at the X-ray fluorescence line of the element from which it is fabricated. In another embodiment, a spectral filter, such as a multilayer optic or crystal, is used in the optical train to achieve preferential imaging in a fluorescence microscope employing either a chromatic or an achromatic lens.

A method for the preparation of optimally fluorescent oligonucleotides wherein fluorescent dye-conjugated nucleotide triphosphates are incorporated into a nucleic acid sequence in a defined repetitive manner which allows for the optimal specific fluorescence of the oligonucleotide. The oligonucleotides of the present invention are useful in the assay of a wide variety of nucleic acid sequences, specifically wherever highly fluorescent nucleic acid probes are desired.

Real time biofilm monitoring systems are provided. Said systems comprise single or multiple fiber-optic probes detecting wavelength-specific fluorescence from biomarkers of fouling organisms; a compact optoelectronic interface and data acquisition system interfaced with said probes, wherein said probe or probes are bifurcated and contain at least one excitation and at least one emission filter permitting the simultaneous resolution of multiple biomarkers.

For imaging a structure in a sample with three-dimensional spatial resolution, a fluorophore is selected which is transferable by means of an optical transfer signal out of a first into a second photochromic state having specific fluorescence properties, and which displays a return rate back into the first photochromic state. The structure is labeled with the fluorophore. Via a common objective, the sample with the labeled structure is subjected both to the optical transfer signal in a spatially limited transfer-volume, and to an optical excitation signal exciting a portion of the fluorophore being in its second photochromic state for fluorescence in a spatially limited excitation-volume, the transfer-volume and the excitation-volume having a common centre of maximum intensity of the transfer signal and of the excitation signal, and a decrease of intensity of the transfer signal with the distance to the common centre of maximum intensity being substantially stronger than any decrease of the effective return rate of the fluorophore. Fluorescence light emitted by the excited fluorophore is detected. The common centre of maximum intensity is shifted with regard to the sample; and the steps of subjecting and detecting are repeated.

The invention discloses a specific fluorescence probe for identifying thiophenol and application of the specific fluorescence probe and belongs to the field of fine chemical industry. The specific fluorescence probe is a derivative of 2-benzothiazole-6-naphthol and is prepared by the following steps: mixing the 2-benzothiazole-6-naphthol and 2, 4-dinitrobenzene into an N, N-dimethylformamide solution according to a proportion, heating, and finally, purifying by adopting silica gel chromatography to obtain the fluorescence probe. The fluorescence probe and a corresponding thiophenol content detecting process can not be interfered by matrixes and impurities in a biological system and can be used for quantitatively determining the thiophenol content in various biological systems. The specific fluorescence probe is high in specificity, can be hydrolyzed after being acted with the thiophenol, namely an ether bond is fractured; is cheap and is easy in acquisition, can be obtained by chemical synthesis, is simple and feasible in synthetic process; is high in sensitivity, is good in fluorescence attribute. A hydrolysate can be excited by a two-photon laser with 800nm as an excitation light source, a biological sample is weak in background fluorescence, and the specific fluorescence probe is suitable for detecting the thiophenol content in cells and is capable of quantitatively determining the thiophenol by drawing a standard curve.

The invention discloses a ratio-type variant receptor mercury ion fluorescent probe and its preparation method and use. The ratio-type variant receptor mercury ion fluorescent probe has the advantages of simple synthesis processes, good light stability, the largest emission wavelength of 550nm and good chemical stability under neutral conditions. Through amide functional group tautomerism, the receptor has a deformation capability of combination of an imidic acid isomer and mercury ions and combination of an amide isomer structure and other metal ions so that the receptor has mercury ion specific combination selectivity. The probe with the mercury ion produces fluorescence spectrum red shift to 633nm and the fluorescence spectrum is enhanced by 9 times. After bonding to other metal ions especially such as congener zinc ion and cadmium ions, the probe has no obvious fluorescence change and has mercury ion specific fluorescence signal selectivity. The probe realizes mercury ion specific ratio identification, can be used in detection of mercury ions in cells and has a wide application prospect in detection of mercury ions in other organisms and environments.

Disclosed herein are fluorescent markers having a double bond ester group and a method for marking and detecting the same. More particularly, disclosed are a method for identifying oil products, which comprises marking the oil products with fluorescent markers having an unsaturated double bond ester group, adding a developing agent having a function of inducing specific fluorescence to the marked oil products, and detecting the fluorescent marker with a fluorescence spectrophotometer in the UV / VIS region, as well as said markers.

The invention belongs to the field of medical materials, and discloses a benzylidene indandione compound and a preparation thereof and an application in specific imaging of a lipid droplet. The structure of the benzylidene indandione compound is as shown in a formula I. The benzylidene indandione compound has the advantage of aggregation-induced emission, and the defects of aggregation-induced quenching of a traditional fluorescent dye can be effectively overcome, so that the specific fluorescence imaging of the lipid droplet in a living cell can be achieved; furthermore, the benzylidene indandione compound has a two-photon absorption cross-section which is high in living cell penetration rate, high in signal to noise ratio, small in cytotoxicity, large in stokes shift and large in near infrared region. The formula I is as shown in the specification.

A method of expressing in vivo heart-specific fluorescence in transgenic line of zebrafish is developed, which provides a research model for studying heart-related gene functions and performing gene therapies in the future. The method comprises the following steps. Firstly, a plasmid is constructed. This plasmid construct includes the upstream regulatory region, the exon 1, the intron 1, and the exon 2 of cmlc2 gene, cDNA of GFP, wherein the cmlc2 gene and GFP cDNA form a cassette, and inverted terminal repeats from adeno-associated virus are flanked at both sides of this cassette. The plasmid construct is linearized and microinjected into one-celled zebrafish fertilized eggs. Lastly, the heart-specific fluorescent expressed zebrafish are selected and the germline-transmitting transgenic strain is generated.

The invention discloses preparation of a supermolecule gel factor based on three-column [5] aromatic hydrocarbon. The supermolecule gel factor is a complex organic gel factor which is synthesized fromamide modified column [5] aromatic hydrocarbon and trimesoyl chloride through a nucleophilic substitution reaction and is based on column aromatic hydrocarbon. According to the gel factor, blue organic gel with aggregation state induction florescence can be formed in cyclohexanol through C-H...pi,pi...pi accumulation and Van der Waals' force. In the organic gel, water solutions of Hg<2+>, Ca<2+>,Mg<2+>, Ni<2+>, Cr<3+>, Cd<2+>, Pb<2+>, Ag<+>, Zn<2+>, Ba<2+>, La<3+>, La<3+>, Eu<3+> and Tb<3+> are respectively added, only addition of Hg<2+> can quench blue florescence of the organic gel, and addition of other cationic ions does not remarkably influence fluorescence intensity of the organic gel, so that specific fluorescence detection on Hg<2+> can be achieved, and a detection limit is 1.02*10<-8>M.

The invention relates to a method for synthesizing an amino functionalized rare earth-doped lanthanum fluoride nano fluorescent marker material, which comprises the steps of: with phosphorylethanolamine as a surface active agent, mixing sodium fluoride, lanthanum nitrate and rare earth nitrate in distilled water, carrying out heat preservation at the temperature of 30-90 DEG C, and stirring for a period of time, washing and drying to obtain the aminated rare earth-doped lanthanum fluoride nanocrystalline with the component of xLn<3+>-(1-x) LaF3, wherein Ln<3+>=Ce<3+>, Yb<3+>, Er<3+>, Tm<3+>, Ho<3+>, Eu<3+>, Gd<3+>, Tb<3+>, Dy<3+>, Sm<3+>, Nd<3+> and Pr<3+>, and x=0-50mol%. The rare earth-doped LaF3 nano fluorescent marker material prepared by the method has the advantages that the size of nanoparticles can be controlled to be about 5nm, water solubility is good and the surface amino can be used to realize the connection with biomolecule. Furthermore, different rare earth ions can be doped into the nanoparticles, so that the specific fluorescence emission can be realized so that the biological connection can be detected sensitively; and the nano fluorescent marker material prepared by the method has the potential in application in the biological marking field.

This invention is in the field of the identification and even isolation of mesenchymal stem cells (MSCs) and other cell types by means of differential specific fluorescence activated cell sorting (FACS).