Abstract: A method of measuring the ability of a biological sample to withstand reactive oxygen species (ROSs). The method includes at least the steps of putting the sample for testing and a photosensitive agent in a liquid medium into contact so as to form a mixture for testing, subjecting the mixture for testing to a dose of light irradiation so as to give rise, by photochemical reaction, to the production of reactive oxygen species, then after irradiation, adding a compound that reacts colorimetrically in the presence of reactive oxygen species (ROSs) to form a chromogen or fluorescent substance, and measuring the quantity of chromogen or fluorescent substance that is produced, and also subjecting a reference mixture to the same photochemical, colorimetric, and measurement reactions as the mixture for testing.

Abstract: A method of measuring the ability of a biological sample to withstand reactive oxygen species (ROSs). The method includes at least the steps of putting the sample for testing and a photosensitive agent in a liquid medium into contact so as to form a mixture for testing, subjecting the mixture for testing to a dose of light irradiation so as to give rise, by photochemical reaction, to the production of reactive oxygen species, then after irradiation, adding a compound that reacts colorimetrically in the presence of reactive oxygen species (ROSs) to form a chromogen or fluorescent substance, and measuring the quantity of chromogen or fluorescent substance that is produced, and also subjecting a reference mixture to the same photochemical, colorimetric, and measurement reactions as the mixture for testing.

Abstract: The invention relates to a compound derived from dihydroporphyrin having the general formula (I): 1

Abstract: A pharmaceutical composition, method and apparatus for treatment, diagnosis or both treatment and treatment of hyperproliferative malignant and non-malignant diseases of epithelial tissues is disclosed. The invention comprises local application of the pharmaceutical composition to a predetermined area of the tissue characterized by complete and consistent coverage of the tissue, including irregularly shaped tissue. The pharmaceutical composition consists of an active component, such as a photosensitizer or a precursor thereof, and at least one carrier substance including a viscous fluid, a gel, or a fluid that becomes viscous upon contact with the tissue. The gel's viscosity allows it to adhere to the tissue for a sufficient amount of time to transfer the photosensitizer or precursor. In a preferred embodiment the pharmaceutical composition is sprayed onto the surface of the diseased tissue.