51,112 research outputs found
Salinity affects metabolomic profiles of different trophic levels in a food chain
No full textSalinization is one of the most important abiotic stressors in an ecosystem. To examine how exposing a host plant to excess salt affects the consequent performance and metabolism of insects in a food chain, we determined the life history traits and the metabolite profiles in rice (Oryza sativa), the herbivore Sitobion avenae, and its predator Harmonia axyridis. When compared with performance under normal (non-stressed) conditions, exposing plants to 50？mM NaCl significantly delayed the timing of development for S. avenae fed on rice and H. axyridis and also reduced the body mass of the latter. Our GC？MS-based analysis revealed clear differences in metabolite profiles between trophic levels or treatment conditions. Salinity apparently increased the levels of main components in rice, but decreased levels of major components in S. avenae and H. axyridis. In addition, 16 metabolites showed salinity-related contrasts in this trophic interaction for our rice？S. avenae？H. axyridis system. Salinity impeded the accumulation of metabolites, especially several sugars, amino acids, organic acids, and fatty acids in both insects, a response that was possibly associated with the negative impacts on their growth and reproduction under stress conditions.
Grand Canyon - Marie Pack
No full textBlack and white photograph by Fred Pack, taken during a field trip with his University of Utah geology students in March of 1927. Marie Pack at Bright Angel Point
Pack Family Reunion at Kamas
No full textBlack and white photograph by Fred Pack showing Pack family members gathered at a family reunion in Kamas, Utah, around 1910
Pack, W. X. - Onion farm, Woods Cross
No full textBlack and white photograph by Fred Pack at the onion farm of his brother, Walker Xenophon Pack, in Woods Cross, Utah, probably in the 1910s or 1920s
Geology Students - St Johns - Ut - FJ Pack in coat
No full textBlack and white photograph showing some of Dr. Fred Pack\u27s University of Utah geology students in the 1900s or early 1910s. Dr. Pack is in the front row wearing a coat
Hansel Valley Earthquake, 1934 - Mrs. Pack
No full textBlack and white photograph by Fred Pack during a visit to Hansel Valley in Box Elder County, Utah, following an earthquake on March 12, 1934. Sadie Pack and automobile with a surface rupture
Hansel Valley Earthquake, 1934 - Eleanor Pack
No full textBlack and white photograph by Fred Pack during a visit to Hansel Valley in Box Elder County, Utah, following an earthquake on March 12, 1934. Eleanor Pack and automobile next to a surface rupture
Hansel Valley Earthquake, 1934 - Mrs. Pack and Eugene
No full textBlack and white photograph by Fred Pack during a visit to Hansel Valley in Box Elder County, Utah, following an earthquake on March 12, 1934.; Mrs. Sadie Pack and Eugene Pack, in a photograph that was reproduced in many newspapers
Grace, Idaho, 1923: Built by Q. R. Pack
No full textBlack and white photograph by Fred Pack during a visit to his brother, Quince R. Pack, at Grace, Idaho, in July of 1923. Quince Pack built the hydroelectric system at Grace, including this pipeline bridge
No.341, Lena Marie and Alvin Pack
No full textTranscript (392 pages) of interview by Tim Larson with Alvin G. Pack and Lena Marie Pack on September 4, 1986-February 10, 1987. This interview is no. 341 in the Everett L. Cooley Oral History Project, and tape nos. U-612 through U-619 and U-679 through U-682In this series of interviews with Tim Larson, Lena (1905-2000) and Alvin (1907-1994) discuss their courtship and marriage, their travels, writing, and public service. They detail their lifetime involved in broadcasting, including KSL radio, KLO, writing radio promotions, KDYL, broadcasting in World War II, the beginnings of KALL radio, Lena Marie\u27s teaching career, the Pony Express Memorial organization, recording Mormon funerals, the University of Utah, and retirement
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