Quantitative Determination of Phytate and Inorganic Phosphorus for Maize Breeding

Phytate is the dominant storage form of phosphorus (P) in mature cereal and oil grains. Phosphorus bound in phytate is nutritionally unavailable to monogastric animals and thus contributes to water pollution because it is excreted in the waste. Also, phytate can chelate certain minerals and exacerbate human mineral deficiencies. Our primary objective was to develop a rapid and inexpensive method of measuring phytate and inorganic P (Pi) concentrations in maize (Zea mays L.). The procedure reported herein was derived from previously published assays and used to screen 50 inbred lines to determine its potential in a selection program. Grain yield, protein, oil, methionine, lysine, tryptophan, and kernel weight were also measured. Field repeatability values for phytate and Pi (0.78 and 0.91, respectively) suggest that our protocol can be used to make heritable measurements on both traits. Phytate measurements taken with the procedure reported herein matched closely those obtained through ion exchange. The combination of adequate precision and simplicity make this method ideal for breeders interested in improving Pi and phytate levels simultaneously. The positive phytate:protein correlation reported commonly was also detected in this study. A relationship between phytate and kernel weight indicates that selection for low phytate may result in larger kernels

Why I Cry for Little Girls

I like working with little kids, and since I have been old enough to be employable, my main source of income has been from childcare: camp counselor, babysitter, nursery school “teacher,” etc

Genetic Variation and Breeding Potential of Phytate and Inorganic Phosphorus in a Maize Population

Seed P is predominantly bound in the organic compound phytate, which makes the bioavailability of P low for monogastric animals fed maize (Zea mays L.)-based diets. Decreasing phytate and increasing inorganic P (Pi, an available form of P) concentrations in maize grain would be desirable to help ameliorate environmental problems associated with high P in feces. Our objective was to investigate the potential of improving the P profile of maize grain through breeding and selection. Ninety S1 families from the BS31 population were evaluated at two locations for phytate, Pi, and other grain quality and agronomic traits. Phytate concentrations ranged from 1.98 to 2.46 g kg−1, and the broad-sense heritability (H) was relatively low (0.60). Both genetic variance and H (0.84) were much greater for Pi Few unfavorable genetic correlations were observed between either Pi or phytate and other key economic traits. Also, selection differentials of multiple trait indices indicated that the P profile of maize grain and grain yield and moisture could be improved simultaneously. Many cycles of selection will be needed, however, to reach desirable phytate and Pi concentrations, especially when selecting for multiple traits. Regardless, our results are encouraging given that the families evaluated were related S1 families and the number of families was relatively small

An introduction to the place of comic strips in American culture

Thesis (M.S.)--Boston Universit

Public Service Broadcasting in Transition: A Documentary Reader

This is a book of documents, comments, and cases that has been prepared, at the request of the European Institute for the Media, for the use of government officials and citizens interested in strengthening public service broadcasting in transition societies. In this book we try to provide a small chest of tools and background information that will be of assistance. We start, in Chapter 1, with an overview of some of the general principles of public service broadcasting, and include pertinent comments on each of them. Here, as throughout the book, we concentrate on issues of governance and financing, with some attention as well to issues surrounding programming. In Chapter 2, we turn to current issues in the European-level debate, partly from the perspective of European expectations and standards that are employed in evaluation and accession processes. In Chapter 3, we look primarily at the UK and Germany, and also at Canada, presenting documents that might illuminate and help in the understanding of the respective models that these long-established systems represent. In Chapter 4, we provide documents on the experience with public service broadcasting in various transformations in transition societies in the last decades