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Creator:: Christopher, John Paul
Abstract:: 2 -acetylaminofluorene -induced hepatocarcinogenesis in rats proceeds in stages of initiation and promotion, similar to experimental systems, in mouse skin. In this study promoters of liver tumorigenesis, phenobarbital, DDT and butylated hydroxytoluene (BHT), were compared to non-promoters, amobarbital, diphenylhydantoin (DPH) and benz(a)anthracene (BA), for their ability to cause liver growth...
Resource Type:: Dissertation
Full Text:: approved: Redacted for privacy Q1,9})/J. .Linsiey 2 -acetylaminofluorene -induced hepatocarcinogenesis in

Creator:: Bump, Edward Allen
Resource Type:: Dissertation
Full Text:: Redacted for Privacy Abstract approved: Donald J. Reed A moderate but prolonged increase in the

Creator:: Wallace, William J.
Abstract:: This study traces the historical foundations of the concept of constant ionic proportionality and the equation (Salinity [S%₀] = 1.805 Chlorinity [Cl%₀] + 0.030) which has been in general use in oceanography since 1902 until 1969 and which is based upon this constancy, The notion that the constituents present in...
Resource Type:: Dissertation
Full Text:: -SALINITY CONCEPT IN OCEANOGRAM Abstract approved: Redacted for Privacy Vert J. Moris This study traces

Creator:: Meganck, Richard Albert
Abstract:: This analysis of Colombia's System of National Park Reservations accomplishes four objectives: 1) The historical development of national parks in Colombia was described; 2) The status, as of August, 1974, of the areas administered by the Colombian Renewable Natural Resources Development Institute (INDERENA) was summarized; 3) An analysis of major...
Resource Type:: Dissertation
Full Text:: this project, its completion would not have been possible. Dr. J. Granville Jensen deserves thanks

Creator:: Benson, Keith Rodney
Abstract:: The major historical studies that have examined American biology have emphasized the development of experimental biology at the end of the nineteenth century. In this characterization, the descriptive branch of biology has often been treated as less than important and, in several cases, as a hindrance in the application of...
Resource Type:: Dissertation
Full Text:: Ferdinand Hamburger, Jr. Archives of Johns Hopkins University for her interest in this study and her many

Creator:: Fonollera, R. E. (Raymundo E.)
Abstract:: El Salvador's land resources are intensively cultivated. Labor is relatively abundant and wages are low. This study analyzed the effects of government policies and observed farm price distortions on enterprise/weed control system choices and associated income-employment effects. A regional linear programming framework was employed to analyze the effects of alternative...
Resource Type:: Dissertation
Full Text:: the degree of Doctor of Philosophy June 1977 APPROVED: V. f -Sil 1 ^ j 1 2> Associate

Creator:: Bell, Walter Lyle
Abstract:: This history concerns the scientific contributions of Charles Babbage (1791-1871) to mathematics, to the invention of calculating machines, and machine tools, to the development of scientific ideas through a wide variety of scientific investigations and his involvement in several different scientific reforms. Babbage considered himself a philosopher in the broadest...
Resource Type:: Dissertation
Full Text:: Road; and in the Closet (London: J. Walker, 1806). It should be noted Babbage wrote this "History" from

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