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Effects of gibberellic acid on toxin formation and disease induction by ceratocystis ulmi, 1977
Get PDFThe effect the addition of gibberellic acid (GA) has on growth and the elaboration of wilt-inducing substances by isolates of Ceratocystis ulmi, when cultured on a liquid synthetic nutrient medium, has been studied. Two methods were followed to assay the disease inducing effect of culture filtrates of the eight isolates studied. They were, namely, a whole seedling assay method and a detached leaf method. Seedlings and leaves of two elm species were used in this study. The elm species were Ulmus alata and Ulmus americana. GA was found to cause a reduction in mycelial yield at all the concentrations used. The least reduction in growth was obtained at 100 ppm GA and the greatest growth reduction was at 1000 ppm. Inconclusive results were obtained in the experiments on GA effect on wilt-inducing substances formed by the pathogen. In Ulmus alata seedlings, culture filtrates from GA-supplemented media generally induced less wilting of seedlings than was obtained in GA-deficient control filtrates. Also, at the highest GA concentrations used, 1000 ppm, the wilting percentage for filtrates from all isolates was 25 to 50% less than the controls. In Ulmus americana seedlings, the results of the assays were more erratic. Some general reduction in wilting percentage was obtained when filtrates containing GA were taken up by seedlings of this species. In other instances the precent wilting occurring at 1000 ppm GA was 100%, the same as the controls. The detached leaf method did not prove suitable for a critical assay of the effect of culture filtrates in disease induction. It appears as if this procedure may have possibilities if available large, uniform size leaves were utilized and if an improved mechanism for leaf support during filtrate uptake is devised
Assessment of social functioning in the Charlotte-Mecklenburg schools of Charlotte, North Carolina, 1964
Get PDFA study of student problems and interests of high school students enrolled in the Union Institute, Athens, Georgia for the year 1953-1951 to identify their implications for administrative curricular procedures and suggest curricular reorganization, 1954
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Selected documents pertaining to blacks in Atlanta, 1850-1937, 1983
Get PDFThis dissertation covers the experiences of the black people of the Atlanta area over a period of eighty-seven years, based primarily on government documents such as acts and resolutions of the Georgia General Assembly; ordinances of the Atlanta City Council; cases of the Fulton County Superior Court, the Georgia Supreme Court and Appellate Court, and the United States Supreme Court; and official histories pertaining to Atlanta. Articles from selected newspapers of Atlanta, both black and white, and from some of the leading journals of the late nineteenth and early twentieth centuries are also included. In order to place the developments in Atlanta in their national historical context, an overview of some of the key issues and episodes that confronted the nation between 1850 and 1937 introduces the study. Each of the four chapters which follow consist of two parts: the first is a brief history of blacks in Atlanta during the period under discussion; and the second is a collection of documents supporting that history. Each document is preceded by a headnote that gives the essence of the document. Chapter I consists of documents that indicate the status of both slave and free blacks. Among the documents is one shows the resentment of white mechanics toward slave mechanics; another illustrates Georgia's determination to perpetuate slavery by denying slaveowners the privilege to free their slaves in their last will and testament. Chapter II covers the activities of black Atlantans during the Reconstruction era through 1895. Documents that highlight this period are those concerning the constitutional convention that show black men participating in the body politic of Georgia for the first time; the election of black men to the General Assembly; the removal and the reinstating of black assembly members; and finally, Booker T. Washington's famous 'Atlanta Compromise' speech. Chapter III contains the record of the plight of blacks in the Atlanta area from 1896 through 1914. During this period, Georgia's racists, led by Governor Hoke Smith and Senator Tom Watson, made an all-out effort to prevent black people from participating in the political process by denying them the right of suffrage. One of the worst riots in the history of the United States occurred during this era in 1906, a riot caused in part by the attempts of blacks to vote. The documents in this chapter are related to these events. Among the documents of the fourth and final chapter are those that show how black Atlantans worked together and succeeded in attaining the first black high school, and those concerning one of the most celebrated cases in the annals of American jurisprudence--the Angelo Herndon case. The appendix contains a list of the documents included in each chapter
A study of the group work methods used in the treatment and rehabilitation of the mental patients at the united states veterans1 administration facility, Tuskegee, Alabama, 1945
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