Abstract:
:Neutral filter elution at pH 7.2 and 9.6 was used to measure the induction of DNA lesions in human P3 teratocarcinoma cells by monochromatic 254-, 270-, 313-, 334-, 365-, and 405-nm radiation and by 60 gamma rays. In this assay DNA double-strand breaks (dsb) increase the rate of elution of DNA from cell lysates on a filter. Yields of dsb as measured by this procedure were determined by using a calibration of the assay that correlates elution parameters with number of dsb caused by disintegration of 125I incorporated into the DNA. Analysis of fluence responses obtained by using the calibrated assay indicated that the number of dsb induced per dalton of DNA as measured by this assay is proportional to the square of the fluence at all the energies of radiation studied, implying that the induction of these lesions may be a two-hit event. Analysis of the relative efficiencies for the induction of dsb by ultraviolet radiation, corrected for quantum efficiency, revealed a spectrum that coincided closely with that for the induction of single-strand breaks (ssb) in the same cells, having a close fit with the spectrum of nucleic acid in the UVC and UVB region below 313 nm, and a shoulder in the UVA region. It was calculated, however, that there may be too few ssb for dsb to result from randomly distributed closely opposed ssb.
journal_name
Photochem Photobioljournal_title
Photochemistry and photobiologyauthors
Peak JG,Peak MJdoi
10.1111/j.1751-1097.1990.tb04194.xsubject
Has Abstractpub_date
1990-08-01 00:00:00pages
387-93issue
2eissn
0031-8655issn
1751-1097journal_volume
52pub_type
杂志文章abstract::Eumelanin (brown/black melanin) and pheomelanin (red/yellow melanin) in human hair can be quantified using chemical methods or approximated using spectrophotometric methods. Chemical methods consume greater resources, making them less attractive for epidemiological studies. This investigation sought to identify the sp...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.2007.00237.x
更新日期:2008-05-01 00:00:00
abstract::Herbal extracts including asiatic acid (AA) have become popular candidates of anti-photoaging agents due to their anti-inflammatory and antioxidant properties and minimal side effect. Nevertheless, low bioavailability due to poor solubility limits their practical application. In this study, a highly bioavailable form ...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/php.13160
更新日期:2020-01-01 00:00:00
abstract::Previous studies have shown that natural killer (NK) cell activity was suppressed in volunteer subjects exposed to ultraviolet radiation (UVR) from solarium lamps. The present studies were carried out to determine the spectrum of UVR responsible for suppression of NK activity and to develop in vitro methods to analyze...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.1993.tb02287.x
更新日期:1993-02-01 00:00:00
abstract::Skin cancer is the most prevalent cancer, and its assessment remains a challenge for physicians. This study reports the application of an optical sensing method, elastic scattering spectroscopy (ESS), coupled with a classifier that was developed with machine learning, to assist in the discrimination of skin lesions th...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/php.13140
更新日期:2019-11-01 00:00:00
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journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.1995.tb03973.x
更新日期:1995-03-01 00:00:00
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journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.1993.tb04986.x
更新日期:1993-12-01 00:00:00
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journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.2009.00540.x
更新日期:2009-07-01 00:00:00
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journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.1991.tb02033.x
更新日期:1991-09-01 00:00:00
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journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/php.13109
更新日期:2019-09-01 00:00:00
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journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.1989.tb09204.x
更新日期:1989-04-01 00:00:00
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journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/php.12156
更新日期:2014-01-01 00:00:00
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journal_title:Photochemistry and photobiology
pub_type: 杂志文章,评审
doi:10.1111/php.12723
更新日期:2017-03-01 00:00:00
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journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.1993.tb04914.x
更新日期:1993-07-01 00:00:00
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journal_title:Photochemistry and photobiology
pub_type: 临床试验,杂志文章
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更新日期:2005-05-01 00:00:00
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journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.1997.tb03160.x
更新日期:1997-09-01 00:00:00
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journal_title:Photochemistry and photobiology
pub_type: 临床试验,杂志文章
doi:10.1111/php.12032
更新日期:2013-05-01 00:00:00
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journal_title:Photochemistry and photobiology
pub_type: 杂志文章,评审
doi:10.1111/j.1751-1097.1996.tb02988.x
更新日期:1996-01-01 00:00:00
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journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.2012.01231.x
更新日期:2013-03-01 00:00:00
abstract::The biguanide metformin is widely used for the treatment of Type-II diabetes. Its antiproliferative and pro-apoptotic effects in various tumor cells suggest its potential candidacy for cancer chemoprevention. Herein, we report that metformin significantly inhibited human epidermoid A431 tumor xenograft growth in nu/nu...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.2012.01165.x
更新日期:2012-09-01 00:00:00
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journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1562/0031-8655(2003)077<0034:suicot>2.0.co;2
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journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/php.12836
更新日期:2018-01-01 00:00:00
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journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.2008.00359.x
更新日期:2008-09-01 00:00:00
abstract::Dark-grown leaves of maize (Zea mays), wheat (Triticum aestivum), wild-type pea (Pisum sativum) and its light-independent photomorphogenesis mutant (lip1) have different proportions of protochlorophyllide (Pchlide) forms as revealed by low-temperature fluorescence emission spectra. Four discrete spectral forms of Pchl...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1562/0031-8655(2003)078<0205:flopip>2.0.co;2
更新日期:2003-08-01 00:00:00
abstract::Sulfur-substituted nucleobases (a.k.a., thiobases) are among the world's leading prescriptions for chemotherapy and immunosuppression. Long-term treatment with azathioprine, 6-mercaptopurine and 6-thioguanine has been correlated with the photoinduced formation of carcinomas. Establishing an in-depth understanding of t...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章,评审
doi:10.1111/php.12975
更新日期:2019-01-01 00:00:00
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journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/php.12505
更新日期:2015-11-01 00:00:00
abstract::Pyrimidine dimers were measured in epidermal DNA of SKH:HR1 mice following exposure to solar-simulated UV radiation (SSUV, 290-400 nm) or to UVA (320-400 nm). Mice were exposed to SSUV or UVA after topical application (2 mg/cm2) of vehicle, a UVB absorber (5% 2-ethylhexyl p-methoxycinnamate [2-EHMC]), or a broad-spect...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.1997.tb07961.x
更新日期:1997-06-01 00:00:00
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journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:
更新日期:1999-12-01 00:00:00
abstract::Cyclooxygenase (COX)-2 inhibitors are known to be used as chemopreventative agents against certain malignancies. Thus far, there has been very limited information on whether COX-2 inhibitors protect against chronic narrow-band UVB (NB-UVB)-induced immunosuppression. The present study investigated the effect of nonsele...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.2007.00289.x
更新日期:2008-03-01 00:00:00
abstract::Betanin (betanidin 5-O-β-D-glucoside) is a water-soluble plant pigment used as a color additive in food, drugs and cosmetic products. Despite its sensitivity to light and heat, betanin maintains appreciable tinctorial strength in low acidic and neutral conditions, where the color of other plant pigments, such as antho...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/php.12897
更新日期:2018-09-01 00:00:00
abstract::We have investigated the factors that affect the virucidal activity of methylene blue (MB) photosensitization. The M13 bacteriophage was more rapidly inactivated at higher temperatures (6 degrees C < 24 degrees C < 38 degrees C). Rate constants for inactivation were 0.072, 0.139 and 0.260 (log10 inactivation)/ (J/cm2)...
journal_title:Photochemistry and photobiology
pub_type: 杂志文章
doi:10.1111/j.1751-1097.1997.tb01937.x
更新日期:1997-05-01 00:00:00