Results 211 to 220 of about 2,727 (259)

Transplacental action of benzo(a)pyrene and pyrene

Bulletin of Experimental Biology and Medicine, 1977
The transplacental and direct action of benzo(a)pyrene (BP) on mice of strains A and C57BL and of their progeny was studied. BP was found to represent a carcinogenic risk for the progeny. The greatest carcinogenic effect in progeny of strain A mice was exhibited by BP in a dose of 6 mg: The frequency of development of lung tumors was 76.8% compared ...
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Comparative tumor initiating activity of 10-methylbenzo[a]pyrene, 7,10-dimethylbenzo[a]pyrene and benzo[a]pyrene

Cancer Letters, 1978
The tumor initiating activity on mouse skin of benzo[a]pyrene (BaP), 7,10-dimethylBaP, and 10-methylBaP was determined. Each compound was tested at initiating doses of 50 microgram and 100 microgram with promotion by application 3 times weekly of 2.5 microgram tetradecanoylphorbol acetate. BaP induced tumors in 40% (100 microgram) and 25% (50 microgram)
S S, Hecht, N, Hirota, D, Hoffman
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Pyrene-fused subphthalocyanine

Chem. Commun., 2011
A pyrene-fused subphthalocyanine synthesized from a reaction of 2,7-di-tert-butyl-4,5,9,10-tetracyanopyrene and tetrafluorophthalonitrile exhibits red-shifted Q-band absorption and a unique linear arrangement in the solid state caused by a π-π stacking interaction.
Soji, Shimizu, Shota, Nakano, Takahisa, Hosoya, Nagao, Kobayashi   +3 more
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Microbial metabolism of pyrene

Chemico-Biological Interactions, 1986
The isolation and identification of pyrene metabolites formed from pyrene by the fungus Cunninghamella elegans is described. C. elegans was incubated with pyrene for 24 h. Six metabolites were isolated by reversed-phase high-performance liquid (HPLC) and thin-layer chromatography (TLC) and characterized by the application of UV absorption, 1H-NMR and ...
C E, Cerniglia, D W, Kelly, J P, Freeman, D W, Miller   +3 more
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Intersystem crossing in pyrene-h10 and pyrene-d10

Chemical Physics Letters, 1968
Abstract : The phosphorescence intensity, phosphorescence lifetime, and fluorescence lifetime of pyrene -h(10) and pyrene -d(10) were measured as functions of temperature from 80K to 300K. Using this data, we determine the temperature dependence of the rate constant for intersystem crossing.
P.F. Jones, S. Siegel
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Possible role of 6‐hydroxymethylbenzo[a]pyrene as a proximate carcinogen of benzo[a]pyrene and 6‐methylbenzo[a]pyrene

International Journal of Cancer, 1973
AbstractBenzo[a]pyrene (B[a]P) and 6‐methylbenzo[a]pyrene ( 6‐MeB[a]P) are metabolized by fortified rat‐liver homogenates to a number of metabolites including one which is indistinguishable from 6‐hydroxymethylbenzo[a]pyrene (6–OHMeB[a]P) by either thin‐layer chromatography or ultra‐violet absorption spectra.
J W, Flesher, K L, Sydnor
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Dynamics of Pyrene-Dimer Association and Ensuing Pyrene-Dimer Dissociation

The Journal of Physical Chemistry A, 2020
To address the possible role of pyrene dimers in soot, chemical dynamics simulations are reported to provide atomistic details for the process of collisional association of pyrene dimers and ensuing decomposition of pyrene dimers. The simulations are performed at 600, 900, 1200, 1600, and 2000 K temperatures (T) with different collisional impact ...
Debdutta Chakraborty, Hans Lischka, William L. Hase   +2 more
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Mutagenicity of pyrene in salmonella

Mutation Research Letters, 1985
Pyrene was tested for mutagenicity in Salmonella typhimurium strains TA97, TA98, TA100 and TA1537. Mutagenicity was seen in all strains when S9 was present.
Z, Matijasević, E, Zeiger
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Bioavailability of atrazine, pyrene and benzo[a]pyrene in European river waters

Chemosphere, 2001
Thirteen river waters and one humic lake water were characterized. The effects of dissolved organic matter (DOM) on the bioavailability of atrazine, pyrene and benzo[a]pyrene (B[a]P) was evaluated. Binding of the chemicals by DOM was analyzed with the equilibrium dialysis technique. For each of the water samples, 24 h bioconcentration factors (BCFs) of
J, Akkanen, S, Penttinen, M, Haitzer, J V, Kukkonen   +3 more
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Fluorescence Decay of Pyrene in a Hydrogenated Pyrene Matrix

Australian Journal of Chemistry, 1979
Pyrene, 4,5-dihydropyrene and 4,5,9,10-tetrahydropyrene have been found to form a true solid solution over a range of composition. The measured fluorescence decay lifetime of pyrene in a hydrogenated pyrene matrix has been found to depend on the wavelength at which the emission is monitored, but not on the wavelength of excitation.
CM Harris, BK Selinger
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