Photochemistry and Photobiology
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THERMODYNAMICS OF THE PRIMARY REACTIONS OF PHOTOSYNTHESISAbstract. It appears to be widely believed that fundamental thermodynamic limitations prevent the products of the primary electron transfer reactions of photosynthesis from exceeding the reactants in energy by more than about 0.7 hv 0 where v 0 is the frequency of the lowes...
Photochemistry and Photobiology - Tập 28 Số 3 - Trang 389-393 - 1978
PHOTOPEROXIDATION OF LENS LIPIDS: PREVENTION BY VITAMIN EAbstract— Light of visible frequency was observed to initiate peroxidative degradation of lipids of rat lenses when the latter were maintained in organ culture. The extent of degradation was monitored by measurement of malanaldehyde. This photodegradative process, which we believe is triggered by light catalyzed generation of superoxide and its subsequent transformat...
Photochemistry and Photobiology - Tập 36 Số 6 - Trang 623-626 - 1982
PHOTOREACTIVATION OF CLOVER YELLOW MOSAIC VIRUSAbstract— Clover yellow mosaic virus, in common with other plant viruses with flexuous, rod‐like particles, can be photoreactivated. At lower U.V. doses, photoreactivation is masked by an inhibitory effect on virus infection of visible light alone.
Photochemistry and Photobiology - Tập 4 Số 4 - Trang 709-711 - 1965
PYRIMIDINE DIMER FORMATION IN ULTRAVIOLET IRRADIATED TMV‐RNAAbstract— The formation of pyrimidine dimers on ultraviolet irradiation of TMV‐RNA in water is demonstrated in the region from 254 nm to 302 nm. No dimer is present in either unirradiated E. coli ribosomal RNA or TMV‐RNA. Dimer formation was also examined in TMV‐RNA irradiated in the presence of 5times10‐6 M proflavin, ...
Photochemistry and Photobiology - Tập 6 Số 5 - Trang 309-319 - 1967
Comparative Photodynamic Evaluation of New Phenothiazinium Derivatives against Propionibacterium acnes†Abstract The screening of recently patented derivatives of the standard phenothiazinium agents methylene blue and toluidine blue was carried out against Propionibacterium acnes , the main bacterium associated with acne vulgaris. Comparative tests were made using the topical agent benzoyl peroxide (BPO) and standard tetracyclines. Each of th... ...
Photochemistry and Photobiology - Tập 88 Số 3 - Trang 523-526 - 2012
TUMOR CELL SPECIFIC DARK CYTOTOXICITY OF LIGHT‐EXPOSED MEROCYANINE 540: IMPLICATIONS FOR SYSTEMIC THERAPY WITHOUT LIGHTAbstract— ‐Merocyanine 540 (MC540) was activated by exposure to 514 nm laser light. The light‐exposed MC540 was then mixed (in the dark) with tumor cells and normal cells to determine the antiproliferative activity. Treatment with light‐exposed MC540 resulted in 70–90% tumor cell kill from different cell lines, while 85% of the normal human mononuclear cells and 41%...
Photochemistry and Photobiology - Tập 52 Số 4 - Trang 831-838 - 1990
IMPAIRMENT OF RED CELL MEMBRANE CYTOSKELETON BY PROTOPORPHYRIN‐IX: LIGHT AND DARK EFFECTSAbstract— Membrane cytoskeletons were separated by use of TritonX–100 from freshly isolated red cells, fixed with glutaraldehyde and their morphology was followed by scanning electron microscopy. At 37°C and pH 6.5 cytoskeletons retained cell‐like shapes for at least 2 h, but at higher pH values, they lost stability after 30 min, appearing as amorphous protein materi...
Photochemistry and Photobiology - Tập 47 Số 5 - Trang 689-697 - 1988
Photodynamic Antifungal Chemotherapy†Abstract The growing resistance against antifungal drugs has renewed the search for alternative treatment modalities, and antimicrobial photodynamic therapy (PDT) seems to be a potential candidate. Preliminary findings have demonstrated that dermatophytes and yeasts can be effectively sensitized in vitro and in vivo...
Photochemistry and Photobiology - Tập 88 Số 3 - Trang 512-522 - 2012
Thermodynamic and Kinetic Study of the Interaction between Alkylpyridinium Ions and Pyrene Derivatives in Aqueous SolutionAbstract— The kinetics of fluorescence quenching of pyrene and three of its derivatives by a series of n ‐alkylpyridinium ions has been studied. The quenching process is diffusion controlled for all the systems studied, independent of the charge in the aromatic molecule and the size of the alkyl chain in the pyridinium ions. Pyrensulfonate,...
Photochemistry and Photobiology - Tập 66 Số 6 - Trang 802-809 - 1997
Tổng số: 190
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