39 results about "Epicocconone" patented technology

An intramolecularly-quenched, near infrared fluorescence probe that emits substantial fluorescence only after interaction with a target tissue (i.e., activation) is disclosed. The probe includes a polymeric backbone and a plurality of near infrared fluorochromes covalently linked to the backbone at fluorescence-quenching interaction-permissive positions separable by enzymatic cleavage at fluorescence activation sites. The probe optionally includes protective chains or fluorochrome spacers, or both. Also disclosed are methods of using the intramolecularly-quenched, near infrared fluorescence probes for in vivo optical imaging.

A fluorescent probe having a base sequence complementary to a specific sequence in a target nucleic acid, wherein the fluorescent probe has one end labeled with a nano particle fluorescent material, and the other end labeled with a fluorescent dye capable of fluorescence resonance energy transfer from the nano particle fluorescent material.

A self-assembled relay probe for detecting a target material is provided including: a first peptide tag bound to the target material; and a first fluorescent conjugate including a first fluorochrome and a first tag binding group; wherein the first fluorescent conjugate selectively associates with the first tag. The probe further includes a second peptide tag bound to the target material; and a second fluorescent conjugate including a second fluorochrome having a longer wavelength and distinct excitation and emission maxima from the first fluorochrome and a second tag binding group. Upon exposure to the target material, the first and second fluorescent conjugates independently associate with the first and second peptide tags, respectively, so as to be a distance apart represented by about 0.1 times R₀ to about 2 times R₀, such that upon excitation of the first fluorescent conjugate, fluorescence resonance energy transfer results in excitation of the second fluorescent conjugate, yielding detectable emission from the second fluorescent conjugate.

An intramolecularly-quenched, near-infrared fluorescence probe that emits substantial fluorescence only after interaction with a target tissue (i.e., activation) is disclosed. The probe includes a polymeric backbone and a plurality of near-infrared fluorochromes covalently linked to the backbone at fluorescence-quenching interaction-permissive positions separable by enzymatic cleavage at fluorescence activation sites. The probe optionally includes protective chains or fluorochrome spacers, or bothours. Also disclosed are methods of using the intramolecularly-quenched, near-infrared fluorescence probes for in vivo optical imaging.

A new class of pH sensitive fluorescent dyes and assays relating thereto are described. The dyes and assays are particularly suited for biological applications including phagocytosis and monitoring intracellular processes. The pH sensitive fluorescent dyes of the present invention include compounds of Formula I:

A new class of visible wavelength fluorescent calcium indicators with the BAPTA-like portion rendered zwitterionic by introduction of amine and carboxylic groups. “Fluo” compounds generally function with no extra ionized groups. The modified BAPTA moiety confers new properties while retaining ion selectivity and pH insensitivity. The dyes demonstrate reduced cell leakage and improved ability to study calcium near the cell membrane and preserve the fluorescent properties of “fluo” dyes. The modifications include (a) piperazinoacetic acid XIII for the leakage resistance (FLUO-LR), (b) dodecylpiperazine XIII for a near membrane indicator (FLUO-MOMO, FLUO-NOMO amphipathic “fluo” indicators which bind to cellular membranes and respond to calcium near the membrane), and (c) a propionic acid XII for general leakage resistance -FLUO-LOJO, FLUO-KOJO “fluo” indicators with an extra charge that enables them to resist leakage).

A fluorometric apparatus capable of configuring to have a small size and operability requiring a simple and easy operation of centrifuging a specimen in a container a rotation center of which is detachably supported by a rotation axis (not shown), exciting the specimen by means of an N₂ laser apparatus and an excitation light irradiator for guiding the laser light emitted from the N₂ laser apparatus, and receiving fluorescence having two types of wavelengths emitted from antibodies labeled with fluorescent dyes in the specimen in a region separate from the region in which the excitation light is radiated by a predetermined angle by using a photomultiplier tube, obtaining a ratio of light intensity for each wavelength, comparing the obtained ratio with a standard value, and estimating a target protein concentration.

A combinatorial library of solid-state fluorescent dyes is prepared by reacting an aldehyde with a solid-supported pyridinium salt having a linker.

Disclosed is a novel class of fluorescent resonance energy transfer (FRET) labelling reagents, based on and synthesised from easily prepared dye building blocks. The labelling reagents are in the form of “cassettes” which enable their attachment to a wide variety of biological and other materials. A labelling reagent comprises at least two fluorescent dye moieties covalently linked via a linker group and optionally having a target bonding group for attaching the reagent to a target. The energy transfer labelling reagents may be bound to target materials through covalent or non-covalent attachment. The dyes are selected so that the emission spectrum of a first (or donor) dye overlaps the absorption spectrum of a second dye, thereby allowing energy transfer to occur between the dyes. The dye building blocks are 4′, 5′-bis-aminomethyl-fluorescein and/or its 5(6)-carboxylic acid and having the structure (1). In addition to the embodiment of the invention which includes a single donor and a single acceptor fluorochrome, the fluorescent energy transfer labelling reagents according to the invention may further comprise one or more third fluorochromes each having third absorption and emission spectra covalently attached to said first or second fluorochromes.

In the case where many interactional substances are immobilized on the front surface side of a light transmitting plate capable of generating evanescent waves on the front surface, and where the fluorescence levels in the interactions between the interactional substances and a fluorescence labeled test substance are detected in a liquid layer according to a conventional method, the detection sensitivity and S/N ratio are low due to the background noise. Furthermore, it is necessary to perform a gel filtration purification step for the purpose of removing an excessive amount of the fluorescence dye used for labeling a test substance before the interactions between the fluorescence labeled test substance and the interactional substances are performed. To solve these problems, this invention proposes the above-mentioned method for detecting the evanescent wave excited fluorescence comprising the step of adding a black colorant, for example, a pigment based colorant mainly containing fine particles such as Bokuju.

A polymer composition having a modified absorption and transmission characteristic particularly suited for photoreactors or photobioreactors made of plastic molded parts and exposed to sunlight or suitable artificial light sources, the polymer selectively comprises the following substances or a combination thereof in addition to the conventional standard additives: an inorganic or organic near infrared absorber for absorbing long-wavelength radiation, an inorganic or organic reflector for reflecting ultraviolet radiation, an inorganic or organic reflector for reflecting visible, near infrared, or infrared radiation, an optical brightener or fluorescent dye for converting the absorbed ultraviolet radiation into visible light or fluorescent light, a photochromic dye for modifying the transmission characteristic of the plastic molded part as a function of light intensity, and an antimicrobial additive for preventing or reducing organic deposits in the photobioreactor. The photobioreactor has a helically designed inner surface for efficiently mixing the reaction medium.

An “in-gel” staining technique for detecting and/or separating proteins during electrophoresis, illustratively as a modification of the standard Laemmli procedure. A fluorescent dye, such as Nile red or Phosphine, is included in the running buffer (mobile phase) which may be a standard Laemmli Tris-Glycine SDS buffer that has been modified to reduce the concentration of detergent (SDS) to less than the typical concentration (0.10% v/v). The fluorescent dye stains proteins during electrophoretic separation. The post-electrophoretic operations are, therefor, reduced and the separated, stained fractions are recoverable for further processing, purifying or analysis.

The present invention provides fluorescent dyes that are based on firefly luciferin structure. These dyes are optimally excited at shorter wavelengths and have Stokes shift of at least 50 nm. The fluorescent dyes of the invention are useful for preparation of dye-conjugates, which can be used in detection of an analyte in a sample.

Security element comprising a first material MAT1 and a second material MAT2 formed in or on a substrate, in such a manner that areas occupied by MAT1 and MAT2 overlap partially or fully,

the first material MAT1 comprising a phosphorescent pigment (donor), the second material MAT2 comprising a fluorescent dye or pigment (acceptor),

wherein the phosphorescent pigment present in MAT1 is capable of emitting phosphorescence radiation in at least one first phosphorescence emission wavelength range λ1e upon excitation by electromagnetic radiation falling within a phosphorescence excitation wavelength range λ1a, and

the fluorescent dye or pigment present in MAT2 is capable of emitting fluorescence radiation in at least one second fluorescence emission wavelength range λ2e upon excitation by electromagnetic radiation falling within an fluorescence excitation wavelength range λ2a of the fluorescent dye or pigment, and

said first phosphorescence emission wavelength range λ1e of the phosphorescent pigment present in MAT1 overlaps with the excitation wavelength range λ2a of the fluorescent dye or pigment present in MAT2, so that after irradiation of the security element with electromagnetic radiation within the phosphorescence excitation wavelength range λ1a the emission of fluorescence radiation in the emission wavelength range λ2e is observable.

The invention discloses primers, kit and method for detecting Escherichia coli Shiga toxin I by PSR (polymerase spiral reaction). The primers for detecting Escherichia coli Shiga toxin I are designedaccording to specific target sequence stx1 of Shiga toxin I and include detection primer Ft and detection primer Bt, as well as acceleration primer IF and acceleration primer IB, and their nucleotidesequences are shown as SEQ ID NO. 1 to 4. The invention also provides a kit for detecting Escherichia coli Shiga toxin I by PSR; the kit includes the above primers, Bst DNA polymerase, and a mixed solution of calcein and manganese chloride, is suitable for detecting Escherichia coli Shiga toxin I by polymerase spiral reaction; after developing with a fluorescent dye, the results can be judged witheyes. The kit is simple and quick to operate, low in detection cost and suitable for field detection.

In the invention, vibrio quantity in aquaculture water is rapidly detected by fluorescent quantitative polymerase chain reaction (PCR) technology. A specific primer for vibrio bacteria is designed by taking a ribosome 16S rRNA gene as a target gene; a fluorescent quantitative standard curve is constructed in a mode of recombinant plasmid; a 20 mu L reaction system, which comprises 10 mu L of SYBR Green I fluorescent premixed reagent, 0.4 mu L of forward primer, 0.4 mu L of reverse primer, 1.6 mu L of DNA template and 7.6 mu L of deionized water, is established by a Premix Ex TaqTM reagent. The fluorescent quantitative PCR method has intuitive result, high specificity and high sensitivity, is rapid to detect the vibrio quantity, solves the problem of an inaccurate result caused by mold breeding in the conventional detection method, overcomes the defect of low specificity of a thiosulfate citrate bile salts sucrose agar (TCBS) culture medium for a vibrio quantitative detection method, and has long-term market development and economic investment potential.

A method of biological assay comprises the steps of providing an enzyme substrate comprising two fluorescence dye groups bound to a flexible peptide, the dye groups being of proximity sufficiently close so as to allow free energy attractions to draw the dyes together to essentially self-quench fluorescence of the dye groups, wherein self quenching of fluorescence of the dye groups is effected by dye dimerization or stacking, and enzymatically cleaving the peptide to release the fluorescence dye groups from dye dimerization or stacking, thereby producing an increase in fluorescence intensity. A protease substrate for use in the method of the invention is also disclosed. This invention finds use in detection and identification of microorganisms, sterilization assurance, pharmaceutical discovery, enzyme assays, immunoassays, and other biological assays.

The present invention relates to a process for the total synthesis of epicocconone analogs of formula (I):

The invention also relates to novel epicocconone analogs.

A fluorescent dye, a structure of a fluorescent storage media and method using thereof, are disclosed. The fluorescent dye of the present invention comprises an organic violet fluorescent compound having a chemical structure (I) is suitable for using a short wavelength laser having a wavelength less than 500 nm as an excitation source. When a short wavelength laser is used for exciting the organic violet fluorescent compound (I), a fluorescence having an emission wavelength larger than 500 nm is induced, and a reading signal can be provided by detecting the intensity of the fluorescence radiation.

The present invention relates to novel methods for detecting or quantifying nucleic acid analytes through their interactions with a nucleic acid probe or a pair of nucleic acid probes, wherein the probe or the pair of probes is comprised of at least one monomeric LNA moiety and two or more dyes, wherein at least one of said dyes is fluorescent. Preferably the probe or the pair of probes is comprised of a combination of two dyes, wherein either both are fluorescent dyes that coactively function as the donor dye and the acceptor dye of a FRET system, or wherein one of said dyes is a fluorescent dye and the other is a corresponding non-fluorescent quencher dye. Included in the present invention are novel nucleic acid probes for use in the detection and quantification of analytes according to the methods of this invention. The novel nucleic acid probes of the invention are comprised of an n-meric nucleic acid comprising any number of 1 to n monomeric locked nucleic acid (LNA) moieties that may be located in any position(s) of the nucleic acid sequence. The nucleic acid probes are further characterized in that they are derivatized with one or more dyes, wherein said dyes are independently selected from fluorescent dyes or non-fluorescent quencher dyes. The methods provided by the invention are based on the change of fluorescence resulting from the hybridization of the inventive nucleic acid probes or pairs of nucleic acid probes with nucleic acid analytes.