In tallgrass prairie, belowground processes are even more important than in forested systems because aboveground biomass and standing dead litter periodically removed by frequent fires or grazers. Thus, studies that address factors regulating especially relevant for prairie. We predicted effects of grazing burning differ changes root productivity caused provide feedback affects ecosystem fluxes C N. These differences response should be driven largely N dynamics the degree to which affect...

Abstract Following changes in vegetation structure and pattern, along with a changing climate, large wildfire incidence has increased forests throughout the western United States. Given this increase, there is great interest whether fuels treatments previous can alter fire severity patterns wildfires. We assessed relative influence of (including wildfire), weather, vegetation, water balance on fire‐severity Rim Fire 2013. did at three different spatial scales to investigate influences...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsolation of a Physiologically Active Tetrahydrocannabinol from Cannabis Sativa ResinH. J. Wollner, John R. Matchett, Joseph Levine, and S. LoeweCite this: Am. Chem. Soc. 1942, 64, 1, 26–29Publication Date (Print):January 1942Publication History Published online1 May 2002Published inissue 1 January 1942https://pubs.acs.org/doi/10.1021/ja01253a008https://doi.org/10.1021/ja01253a008research-articleACS PublicationsRequest reuse permissionsArticle...

First posted September 10, 2015 For additional information, contact: Director, Western Ecological Research CenterU.S. Geological Survey3020 State University Drive EastSacramento, California 95819http://werc.usgs.gov/ Fire ranks among the top three threats to greater sage-grouse (Centrocercus urophasianus) throughout its range, and two in western part of range. The national research strategy for this species recent U.S. Department Interior Secretarial Order 3336 call science-based assessment...

Abstract Crambe abyssinica can be grown in the principal wheat growing areas of Western U. S. and Northern Corn Belt states with yields 2000 lb seed/acre. The seed contains 35% oil, which erucic acid constitutes 60% total fatty acids. converted by ozonolysis into brassylic pelargonic It has been estimated that chemical industry could afford to pay about 7.7ঁ/lb for when used production both acid, assuming an 85% yield oil a sales price 35ঁ/lb 15ঁ/lb acid. A higher justified if some indicated...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsolation of Ecgonidine Methyl Ester from Coca Seeds1John R. Matchett and Joseph LevineCite this: J. Am. Chem. Soc. 1941, 63, 9, 2444–2446Publication Date (Print):September 1, 1941Publication History Published online1 May 2002Published inissue 1 September 1941https://pubs.acs.org/doi/10.1021/ja01854a038https://doi.org/10.1021/ja01854a038research-articleACS PublicationsRequest reuse permissionsArticle Views119Altmetric-Citations13LEARN ABOUT THESE...

Fire is one of the principal agents changing forest carbon stocks and landscape level distributions carbon, but few studies have addressed how accurate accounting fire-killed trees or can be. We used a large number forested plots (1646), detailed selection species-specific location-specific allometric equations, vegetation type maps with high levels accuracy, Monte Carlo simulation to model amount uncertainty aboveground tree present in species (hereafter, carbon) within Yosemite Sequoia...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of Acetyl GroupJohn R. Matchett and Joseph LevineCite this: Ind. Eng. Chem. Anal. Ed. 1941, 13, 2, 98–99Publication Date (Print):February 1, 1941Publication History Published online1 May 2002Published inissue 1 February 1941https://pubs.acs.org/doi/10.1021/i560090a017https://doi.org/10.1021/i560090a017research-articleACS PublicationsRequest reuse permissionsArticle Views69Altmetric-Citations6LEARN ABOUT THESE METRICSArticle Views are...

In tallgrass prairie, belowground processes are even more important than in forested systems because aboveground biomass and standing dead litter periodically removed by frequent fires or grazers. Thus, studies that address factors regulating especially relevant for prairie. We predicted effects of grazing burning differ changes root productivity caused provide feedback affects ecosystem fluxes C N. These differences response should be driven largely N dynamics the degree to which affect...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Still Designed for Small ChargesJohn Matchett and Joseph LevineCite this: Ind. Eng. Chem. Anal. Ed. 1943, 15, 4, 296Publication Date (Print):April 1, 1943Publication History Published online1 May 2002Published inissue 1 April 1943https://pubs.acs.org/doi/10.1021/i560116a030https://doi.org/10.1021/i560116a030research-articleACS PublicationsRequest reuse permissionsArticle Views27Altmetric-Citations3LEARN ABOUT THESE METRICSArticle Views...

The non-native tree, Tamarix spp. has invaded desert riparian ecosystems in the south-western United States. Fire hazard increased, as typically fire-resistant native vegetation is replaced by Tamarix. tamarisk leaf beetle, Diorhabda carinulata Desbrochers, introduced for biological control, may affect fire behaviour converting hydrated live leaves and twigs into desiccated dead fuels. This potentially increases short term before can be re-established. study investigates how altered fuels...

A central challenge of conservation biology is using limited data to predict rare species occurrence and identify areas that play a disproportionate role in regional persistence. Where occupy discrete patches landscape, such predictions require about environmental quality individual the connectivity among high patches. We present novel extension occupancy modeling blends traditional patch with network analysis estimate characteristics survey data. demonstrate this approach geospatial...

Although precipitation is correlated with fire size in desert ecosystems and typically used as an indirect surrogate for fine fuel load, a direct link between biomass has not been established. In addition, nitrogen (N) deposition can affect risk through its fertilisation effect on production. this study, we examine the relationships precipitation, N emphasis identifying thresholds associated spreading across landscape. We 28-year record of 582 burns from low-elevation scrub to evaluate...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDevice for Continuous Liquid-Liquid Extraction: Adaptation the Determination of MorphineJohn Matchett and Joseph LevineCite this: Ind. Eng. Chem. Anal. Ed. 1941, 13, 4, 264–265Publication Date (Print):April 1, 1941Publication History Published online1 May 2002Published inissue 1 April 1941https://pubs.acs.org/doi/10.1021/i560092a025https://doi.org/10.1021/i560092a025research-articleACS PublicationsRequest reuse permissionsArticle...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFractionating Molecular StillH J. Wollner, John R. Matchett, and Joseph. LevineCite this: Ind. Eng. Chem. Anal. Ed. 1944, 16, 8, 529–531Publication Date (Print):August 19, 1944Publication History Published online1 May 2002Published inissue 19 August 1944https://doi.org/10.1021/i560132a019RIGHTS & PERMISSIONSArticle Views47Altmetric-Citations5LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since...

Abstract Statistical models often use observational data to predict phenomena; however, interpreting model terms understand their influence can be problematic. This issue poses a challenge in species conservation where setting priorities requires estimating influences of potential stressors using data. We present novel approach for inferring rare stressor on by blending predictive with nonparametric permutation tests. illustrate the two case studies involving amphibians Yosemite National...

Journal Article Report on Caffeine Get access John R Matchett Associate Referee U. S. Bureau of Narcotics, Washington, D. C Search for other works by this author on: Oxford Academic Google Scholar Association Official Agricultural Chemists, Volume 23, Issue 4, 1 November 1940, Pages 768–773, https://doi.org/10.1093/jaoac/23.4.768 Published: 21 February 2020