The results available so far suggest to us the following tentative conclusions. First, there are at least two agents extracted by aqueous barium hydroxide from commercial cigarette tobacco that are required simultaneously in order to exhibit tumor-promoting activity. One of the agents is soluble in 80% methanol and is probably soluble in 95% methanol. The other is insoluble in 80% methanol and ...

phytoremediation is an emerging green technology that uses plants and their associated microbes to remediate different environments contaminated with various pollutants. phytoremediation, as an effective soil remediation technology, has gained popularity in the past ten years both in developed and developing countries. the main goal of the current article is to improve the understanding of phyt...

Fire is pervasive in forests used by California Spotted Owls (Strix occidentalis occidentalis) and their prey species. We assessed the diets and sizes of the breeding-season home ranges of seven Spotted Owls occupying burned forests in the southern Sierra Nevada 4 years after a fire and compared the results with data from previous studies in unburned forests within the range of the subspecies. ...

The use of natural gas (NG) in dual-fuel heavy-duty engines has the potential to reduce pollutant and greenhouse (GHG) emissions from transport sector when compared conventional diesel engines. However, NG composition methane slip are interest because both can adversely affect benefits as an alternative fuel, especially considering GHG emissions. Therefore, this study experimentally investigate...

Biofuels are receiving increased scientific attention, and recently different biofuels have been proposed for spark ignition engines. This paper presents the state of art using in engines (SIE). Different biofuels, mainly ethanol, methanol, i-butanol-n-butanol, acetone, blended together single dual issues evaluated as renewables SIE. The were compared with each other well fossil fuel Future SIE...

We monitored the riparian bird community for two years following the 1995 Vision Fire in the Point Reyes National Seashore (PRNS), Marin County, Cal i for nia. We compare bird and vegetation data on burned and unburned sites within PRNS and the Golden Gate National Recreation Area. Bird abundance, as indexed by fi xed-radius point counts, was higher for sev er al shrub-nesting species at burned...