Showing 1-30 of 30 resultados for "


Chau-Thuy Pham et al.
International journal of environmental research and public health, 16(13) (2019-07-05)
This research investigated the distribution and contribution of polycyclic aromatic hydrocarbons (PAHs) and nitro-polycyclic aromatic hydrocarbons (NPAHs) bound to particulate matter (PM) emitted from open burning of rice straw (RS) into the atmosphere in the north of Vietnam. The experiments...
C Raha et al.
Journal of toxicology and environmental health, 19(1), 55-64 (1986-01-01)
Nitropolycyclic aromatic hydrocarbons (nitroarenes), including 6-nitrobenzo[a]pyrene (6-NBap), occur in our environment and are mutagenic in bacterial mutagenesis assays. The mutagenicity of 6-NBaP is enhanced when rat liver S9 is added. To investigate the cause of this increased activity, the metabolism...
G Löfroth et al.
Carcinogenesis, 5(7), 925-930 (1984-07-01)
Several nitroarenes derived from benzo[a]pyrene and perylene and the parent hydrocarbons have been assayed for mutagenicity in the Salmonella microsome test and for affinity for the 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD)-receptor protein in rat liver cytosol. 1- and 3-nitrobenzo[a]pyrene are mutagenic in the...
Kazuichi Hayakawa et al.
International journal of environmental research and public health, 17(2) (2020-01-16)
Total suspended particulate matter (TSP) was collected during the summer and winter in five cities in China (Shenyang, Beijing, and Shanghai), Russia (Vladivostok), and Korea (Busan) from 1997 to 2014. Nine polycyclic aromatic hydrocarbons (PAHs) with four to six rings...
B S Hass et al.
Carcinogenesis, 7(4), 681-684 (1986-04-01)
Previous studies have shown that 1- and 3-nitrobenzo[a]pyrene (NBaP) were mutagenic in the Salmonella reversion assay without exogenous activation and that 1-, 3- and 6-NBaP were mutagenic in the presence of hepatocytes or liver homogenate (S9). In the present study...
P P Fu et al.
Mutation research, 209(3-4), 123-129 (1988-11-01)
6-Nitrobenzo[a]pyrene, an environmental pollutant, was metabolized by human intestinal microflora to 6-nitrosobenzo[a]pyrene and 6-aminobenzo[a]pyrene. The two-electron reduction product 6-nitrosobenzo[a]pyrene exhibited strong direct-acting mutagenicity in the Salmonella typhimurium assay. These results imply that 6-nitrobenzo[a]pyrene can be hazardous to human health via...
Determination and comparison of nitrated-polycyclic aromatic hydrocarbons measured in air and diesel particulate reference materials
Bamford AH, et al.
Chemosphere, 50(5), 575-587 (2003)
C Raha et al.
Journal of chromatography, 450(3), 325-336 (1988-10-26)
6-Nitrobenzo[a]pyrene (6-NBaP) occurs in the environment, is mutagenic in the Ames assay in the presence of added S9 and is carcinogenic to male but not female mouse liver when injected intraperitoneally (i.p.) into mice. In order to understand what kinds...
P P Fu et al.
Mutation research, 376(1-2), 43-51 (1997-05-12)
We have been interested in determining the structural and electronic features that may be useful in predicting the mutagenic activity of nitro-polycyclic aromatic hydrocarbons (nitro-PAHs). We have previously found that a correlation between structural and electronic features and direct-acting mutagenicity...
W F Busby et al.
Toxicology and applied pharmacology, 99(3), 555-563 (1989-07-01)
A BLU:Ha newborn mouse lung adenoma bioassay was employed to compare the tumorigenicity of selected mononitroarenes and unsubstituted parent compounds 6 months after initial treatment. The presence of a nitro group had a variable effect upon compound potency in which...
Wanli Xing et al.
International journal of environmental research and public health, 17(3) (2020-02-06)
Polycyclic aromatic hydrocarbons (PAHs) and nitro-PAHs (NPAHs) in PM2.5 samples were collected at a roadside monitoring station in Kanazawa, Japan, in every season from 2017 to 2018. Nine PAHs and five NPAHs were determined using high-performance liquid chromatography with fluorescence...
Effect of nitro substitution on the light-mediated mutagenicity of polycyclic aromatic hydrocarbons in Salmonella typhimurium TA98.
G L White et al.
Mutation research, 144(1), 1-7 (1985-09-01)
P P Fu et al.
Mutation research, 209(3-4), 115-122 (1988-11-01)
The direct-acting mutagenicity in Salmonella typhimurium strains TA98 and TA100 and the half-wave reduction potentials of 6-nitrobenzo[a]pyrene (6-nitro-BaP), 7-nitrobenz[a]anthracene (7-nitro-BA), and a series of their derivatives were compared. The common structural feature of these compounds is that their nitro substituents...
Binary mixtures containing isomers of nitrobenzo[a]pyrene induce greater-than-additive mutational responses in Salmonella typhimurium. I. Analysis by the total concentration-proportional mixture model.
B S Hass et al.
Mutation research, 190(4), 247-252 (1987-04-01)
B S Hass et al.
Mutation research, 171(2-3), 123-129 (1986-08-01)
The mononitro-substituted isomers of benzo[a]pyrene (B[a]P), 1-, 3- and 6-nitrobenzo[a]pyrene (NB[a]P), are environmental pollutants and are metabolized to mutagens in Salmonella by rat-liver homogenate postmitochondrial supernatant (S9) fractions. In this study, activation of these compounds to mutagens was investigated using...
C R Raha et al.
Toxicology letters, 37(3), 229-233 (1987-08-01)
6-Nitrobenzo[alpha]pyrene (6-NBaP) occurs in our environment. Since human exposure to environmental contaminants may occur via the inhalation route, we examined the metabolites of 6-NBaP formed in lung preparations, and compared the metabolite profile to that which was found with liver....
Kefa K Onchoke et al.
The journal of physical chemistry. A, 110(1), 76-84 (2006-01-06)
The molecules benzo[a]pyrene (BaP) and 1-, 3-, and 6-nitrobenzo[a]pyrene (1-NBaP, 3-NBaP, 6-NBaP) are currently of significant interest due to their presence in respirable combustion exhaust particulates and their mutagenic and carcinogenic properties. Structure-function correlations as well as spectroscopic signatures for...
Jijie Kong et al.
Journal of environmental sciences (China), 102, 159-169 (2021-02-28)
Nitrated polycyclic aromatic hydrocarbons (NPAHs) have toxic potentials that are higher than those of their corresponding parent polycyclic aromatic hydrocarbons (PAHs) and thus have received increasing attention in recent years. In this study, the occurrence, distribution, source, and human health...
C W Sheu et al.
Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association, 32(7), 611-615 (1994-07-01)
The transforming activities of four polycyclic aromatic hydrocarbons and six of their nitro-derivatives were studied using BALB/3T3 clone A31-1-1 cells in the absence of exogenous metabolic activation. Each compound was assayed two to four times to its maximal level of...
K Fukuhara et al.
Journal of the American Chemical Society, 123(36), 8662-8666 (2001-09-06)
Photolabile 6-nitrobenzo[a]pyrene (6-nitroBaP) released nitric oxide (NO) under visible-light irradiation. The generation of NO and the concomitant formation of the 6-oxyBaP radical were confirmed by ESR. BaP quinones were also detected as further oxidized products of the 6-oxyBaP radical. No...
R C Garner et al.
Cancer research, 45(12 Pt 1), 6225-6231 (1985-12-01)
Human colon and bronchus tissue explants were incubated with either [3H]benzo(a)pyrene ([3H]BP) or [3H]-6-nitrobenzo(a)pyrene ([3H]-6-NBP). The total percentage of metabolism of BP and 6-NBP was, respectively, 8-59% and 18-41% in bronchus and 11-23% and 36-50% in colon. A product tentatively...
C Raha et al.
Research communications in chemical pathology and pharmacology, 58(1), 63-74 (1987-10-01)
6-Nitrobenzo (a) pyrene (6-NBaP) is an environmental contaminant. In bacterial mutagenesis assays, 6-NBaP requires rat liver S9 enzymes for its activity. Chemical characterization of metabolites of 6-NBaP produced by male rat liver microsomes showed them to be ring-hydroxylated (both mono-...
M Sala et al.
Carcinogenesis, 8(4), 503-507 (1987-04-01)
Two nitroaromatics, 6-nitrobenzo[a]pyrene (6-N-BaP) and 6-nitrochrysene (6-N-CRY), and the corresponding parent hydrocarbons, benzo[a]pyrene (BaP) and chrysene (CRY), were studied in in vitro transformation assays with Syrian hamster embryo (SHE) cells, BALB/3T3 and C3H10T1/2 mouse cell lines. The three cell systems...
K E Richardson et al.
Journal of toxicology and environmental health, 23(4), 527-537 (1988-01-01)
The compounds 1-, 3-, and 6-nitrobenzo[a]pyrene (nitro-BaP) are environmental pollutants and have been shown to be potent bacterial mutagens. The anaerobic metabolism of these isomeric nitro-BaPs was investigated by the incubation of rat intestinal microflora with each isomer for 48...
Isomeric mononitrobenzo[a]pyrenes: synthesis, identification and mutagenic activities.
J N Pitts et al.
Mutation research, 140(2-3), 81-85 (1984-06-01)
G C Millner et al.
Journal of toxicology and environmental health, 19(4), 519-530 (1986-01-01)
The fungal metabolism of the potent mutagenic and carcinogenic nitropolycyclic aromatic hydrocarbon (nitro-PAH) 6-nitrobenzo[a]pyrene (6-NO2-BaP) was investigated. Cunninghamella elegans was incubated with 6-NO2-BaP for periods ranging between 1 and 7 d, and the metabolites formed were separated by high-performance liquid...
Metabolism of 1-nitropyrene and 6-nitrobenzo(a)pyrene by intestinal microflora.
C E Cerniglia
Progress in clinical and biological research, 181, 133-137 (1985-01-01)
IARC monographs on the evaluation of carcinogenic risks to humans, 46, 255-266 (1989-01-01)
B W Manning et al.
Applied and environmental microbiology, 54(1), 197-203 (1988-01-01)
Since bacterial nitroreduction may play a critical role in the activation of nitropolycyclic aromatic hydrocarbons, we have used batch and semicontinuous culture systems to determine the ability of intestinal microflora to metabolize the carcinogen 6-nitrochrysene (6-NC). 6-NC was metabolized by...
C E Mitchell et al.
Cancer letters, 48(2), 129-134 (1989-11-30)
Carcinogen-induced damage to nuclear matrix DNA, the site of DNA replication and transcription, could have profound effects on gene regulation and mutation. 1,6-Dinitropyrene (1,6-DNP), 1-nitropyrene (1-NP), 6-nitrobenzo[a]pyrene (6-NBP), benzo[a]pyrene (BP) and benzo[a]pyrene diolepoxide (BPDE) were investigated for their abilities to...