Abstract: To provide novel compounds that are promising as prodrug-type anticancer agents, a compound represented by general formula (I) or a salt thereof is provided.

Abstract: It is an object of the present invention to provide a fluorescence imaging probe capable of selectively visualizing target cells such as cells expressing ?-galactosidase (lacZ expressing cells) at a single-cell level in a red fluorescence region, and of performing co-staining together with GFP.

Abstract: Provided is a novel fluorescent probe. A compound of the following general formula (I) or a salt thereof.

Abstract: A novel non-fluorescent rhodamine dye forms a twisted intramolecular charge transfer state. A substituent that causes steric hindrance is introduced at an ortho position of a dimethylamino group on the xanthene ring of tetramethylrhodamine, which is a general rhodamine that exhibits strong fluorescence, and a certain amount of twist is imparted in a ground state. As a result, the formation of the twisted intramolecular charge transfer state is promoted in the excited state and non-fluorescence is exhibited.

Abstract: A factor that is caused by a nucleic acid and influences the kinetics of an extracellular vesicle is screened. A library of barcoded extracellular vesicles is provided.

Abstract: Provided is a novel fluorescent probe which can be used in a spray manner, has an outstandingly high sensitivity-specificity with instantaneousness, and enables detection of a brain tumor.

Abstract: A fluorescent probe for sialidase activity detection, is a compound represented by the following general formula or a salt thereof. R1, if present, represents the same or different monovalent substituent present on a benzene ring. R2 and R3 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a halogen atom. R4 and R5 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a halogen atom. R6 represents a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, or a fluorinated alkyl group having 1 to 5 carbon atoms. R6? represents a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, and R6? may form, together with R3 or R5 a five to seven-membered heterocyclyl or heteroaryl containing a nitrogen atom to which R6? is bonded.

Abstract: As a technique for detecting an influenza virus with an improved accuracy, there is provided a method for detecting an influenza virus in a biological sample by using a first probe, which is decomposed by an influenza virus-derived neuraminidase and a bacterium-derived neuraminidase to generate an optically detectable signal, and a second probe, which is decomposed by the bacterium-derived neuraminidase to generate an optically detectable signal and not decomposed by the influenza virus-derived neuraminidase.

Abstract: A fluorescent probe is capable of detecting breast cancer, lung cancer, and squamous cell carcinoma. The fluorescent probe is also capable of detecting a benign tumor of a mammary gland.

Abstract: A compound is represented by the following general formula (I): The compound or a salt thereof provides a fluorescent probe for detecting carboxypeptidase activity. In the formula, R1 represents an alkyl group having 1 to 6 carbon atoms or an alkoxy group having 1 to 6 carbon atoms; T represents an amino acid residue or a residue of an amino acid derivative; S represents a C-terminal amino acid residue. represents a fluorophore, and the fluorophore is a fluorophore in which an absorption/fluorescence wavelength greatly changes or a quenched state changes to a fluorescent state by elimination of the —P(?O)(—R1)-T-S moiety.

Abstract: A novel non-fluorescent rhodamine dye forms a twisted intramolecular charge transfer state. A substituent that causes steric hindrance is introduced at an ortho position of a dimethylamino group on the xanthene ring of tetramethylrhodamine, which is a general rhodamine that exhibits strong fluorescence, and a certain amount of twist is imparted in a ground state. As a result, the formation of the twisted intramolecular charge transfer state is promoted in the excited state and non-fluorescence is exhibited.

Abstract: A fluorescent probe can be used to detect and visualize carboxypeptidase activity with high sensitivity. The fluorescent probe has, as a base nucleus, a fluorescent skeleton that functions in the visible light region, and makes carboxypeptidase activity detectable and visible, for example, within a cell or clinical specimen, with high sensitivity.

Abstract: To provide novel compounds that are promising as prodrug-type anticancer agents, a compound represented by general formula (I) or a salt thereof is provided.

Abstract: [Problem] To provide a novel fluorescent probe for super-resolution imaging that uses fluorescent light emission characteristics that originate from an intermolecular nucleophilic addition-dissociation equilibrium reaction, and to provide a super-resolution fluorescent imaging method that uses the probe.

Abstract: Fluorescent probes and their salts have high fluorescence quantum yield and high resistance to photobleaching suitable for visualizing various pH environments within cells such as weakly basic, neutral, and weakly acidic environments.

Abstract: [Problem to be Solved] To provide a fluorescent probe for ALDH3A1 detection that can be used in flow cytometry adaptable to live cells. [Means of Resolution] A compound represented by general formula (I) or a salt thereof, wherein the compound or salt thereof has a retention time on an HPLC chromatogram measured under the following conditions of longer than 6.9 minutes when said compound is in aldehyde form and of 6.9 minutes or less when said compound is in carboxylic acid form.

Abstract: A near-infrared fluorescent probe has fluorescence in the near-infrared region. Like CaSiR-1, the probe has rhodamines as the fluorescent mother nucleus and accumulates in the cytoplasm. The probe makes it possible to visualize concentration fluctuations in metal ions, such as calcium ions, within the body.

Abstract: [Problem] A problem addressed by the present invention is to provide a novel fluorescent probe having excellent tissue permeability that is capable of detecting the peptidase activity expressed at a high level in cancer cells and the like as a response of long-wavelength red fluorescence.

Abstract: It is an object of the present invention to provide a fluorescence imaging probe capable of selectively visualizing target cells such as cells expressing ?-galactosidase (lacZ expressing cells) at a single-cell level in a red fluorescence region, and of performing co-staining together with GFP.

Abstract: [Problem] To provide a fluorescent probe that detects calpain activity in cells at high sensitivity. [Solution] A compound represented by the following general formula (I) or a salt thereof.