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Landscape attributes that vary with microtopography, such as active layer thickness (ALT), are labor intensive and difficult to document effectively through in situ methods at kilometer spatial extents, thus rendering remotely sensed methods desirable. Spatially explicit estimates of ALT can provide critically needed data for parameterization,… (More)
The respiratory tract of male and female Syrian golden hamsters was treated intratracheally with 7H-dibenzo[c,g]carbazole (DBC), a tobacco smoke component. The carcinogen was given by multiple instillations at two dose levels. At the lower dose (9 mg), 35 of 46 hamsters (72%) developed respiratory tract tumors. The group receiving treatment at the higher… (More)
Using optically stimulated luminescence (OSL) analysis we obtained depositional ages ranging from 25 ± ± ± ± ± 10 to 928 ± ± ± ± ± 144 years before present for sediments deposited in oxbow lakes
The possible carcinogenic or fibrogenic effects of intratracheal instillation of a polycyclic hydrocarbon, benzo(a) pyrene (B(a)P), alone or in combination with several dusts - titanium dioxide (TiO2), aluminum oxide (Al2O3), carbon (C), and ferric oxide (Fe3O3) - were investigated in hamsters. When administered alone, the dusts induced interstitial cell… (More)
This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Abstract In the future, Earth will be warmer, precipitation events will be more extreme, global mean sea level will rise, and many… (More)
Benzo(a)pyrene (0.5 mg), in itself weakly carcinogenic, when given in combination with ferric chloride (0.16 mg) or iodine (0.2 mg), alone noncarcinogen, induced a number of tumors of different parts of the respiratory tract of Syrian golden hamsters.