University of Iowa Graduate College news. Spring 2008.

Newsletter on the activities of the University of Iowa Graduate College.

University of Iowa Graduate College news. Fall 2008.

Newsletter on the activities of the University of Iowa Graduate College.

University of Iowa Graduate College news. Spring 2009.

Newsletter on the activities of the University of Iowa Graduate College.

University of Iowa Graduate College news. Fall 2009.

Newsletter on the activities of the University of Iowa Graduate College.

University of Iowa Graduate College news. Spring 2010.

Newsletter on the activities of the University of Iowa Graduate College.

University of Iowa Graduate College news. Fall 2010.

Newsletter on the activities of the University of Iowa Graduate College.

University of Iowa Graduate College news. Spring 2011.

Newsletter on the activities of the University of Iowa Graduate College.

University of Iowa Graduate College news. Fall 2011.

Newsletter on the activities of the University of Iowa Graduate College.

Evaluation of Fly Ash in Portland Cement Concrete Paving in Woodbury County, Iowa, Final Report, HR-201, 1980

The earliest overall comprehensive work on the use of fly ash in concrete was reported by Davis and Associates of the University of California in 1937. Since that time, there have been numerous applications of the use and varying propertions of fly ash in portland cement concrete mixes. Fly ash is a pozzolanic powdery by-product of the coal combustion process which is recovered from flue gases and is, generally associated with electric power generating plants. Environmental regulations enacted in recent years have required that fly ash be removed from the flue gases to maintain clean air standards. This has resulted in an increased volume of high quality fly ash that is considered a waste product or a by-product that can be utilized in products such as portland cement concrete. There are several sources of the high quality fly ash located in Iowa currently producing a combined total of 281,000 tons of material annually.

Report on the State University of Iowa, Iowa City, Iowa for the year ended June 30, 2013

Report on the State University of Iowa, Iowa City, Iowa for the year ended June 30, 2013

Report on Iowa State University of Science and Technology, Ames, Iowa, for the year ended June 30, 2013

Report on Iowa State University of Science and Technology, Ames, Iowa, for the year ended June 30, 2013

Report on the University of Northern Iowa for the year ended June 30, 2013

Report on the University of Northern Iowa for the year ended June 30, 2013

Report on a special investigation of the University of Iowa Athletic Ticket Office and the operations of the Hawkeye Express for the period September 1, 2005 through November 30, 2013

Report on a special investigation of the University of Iowa Athletic Ticket Office and the operations of the Hawkeye Express for the period September 1, 2005 through November 30, 2013

Pleiotropy in the melanocortin system: expression levels of this system are associated with melanogenesis and pigmentation in the tawny owl (Strix aluco).

The adaptive function of melanin-based coloration is a long-standing debate. A recent genetic model suggested that pleiotropy could account for covariations between pigmentation, behaviour, morphology, physiology and life history traits. We explored whether the expression levels of genes belonging to the melanocortin system (MC1R, POMC, PC1/3, PC2 and the antagonist ASIP), which have many pleiotropic effects, are associated with melanogenesis (through variation in the expression of the genes MITF, SLC7A11, TYR, TYRP1) and in turn melanin-based coloration. We considered the tawny owl (Strix aluco) because individuals vary continuously from light to dark reddish, and thus, colour variation is likely to stem from differences in the levels of gene expression. We measured gene expression in feather bases collected in nestlings at the time of melanin production. As expected, the melanocortin system was associated with the expression of melanogenic genes and pigmentation. Offspring of darker reddish fathers expressed PC1/3 to lower levels but tended to express PC2 to higher levels. The convertase enzyme PC1/3 cleaves the POMC prohormone to obtain ACTH, while the convertase enzyme PC2 cleaves ACTH to produce α-melanin-stimulating hormone (α-MSH). ACTH regulates glucocorticoids, hormones that modulate stress responses, while α-MSH induces eumelanogenesis. We therefore conclude that the melanocortin system, through the convertase enzymes PC1/3 and PC2, may account for part of the interindividual variation in melanin-based coloration in nestling tawny owls. Pleiotropy may thus account for the covariation between phenotypic traits involved in social interactions (here pigmentation) and life history, morphology, behaviour and physiology.